/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   emk <VYV03354@nifty.ne.jp>
 *   Daniel Glazman <glazman@netscape.com>
 *   L. David Baron <dbaron@dbaron.org>
 *   Boris Zbarsky <bzbarsky@mit.edu>
 *   Mats Palmgren <mats.palmgren@bredband.net>
 *   Christian Biesinger <cbiesinger@web.de>
 *   Jeff Walden <jwalden+code@mit.edu>
 *   Jonathon Jongsma <jonathon.jongsma@collabora.co.uk>, Collabora Ltd.
 *   Siraj Razick <siraj.razick@collabora.co.uk>, Collabora Ltd.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/* parsing of CSS stylesheets, based on a token stream from the CSS scanner */

#include "nsCSSParser.h"
#include "nsCSSProps.h"
#include "nsCSSKeywords.h"
#include "nsCSSScanner.h"
#include "mozilla/css/Loader.h"
#include "nsICSSStyleRule.h"
#include "nsICSSImportRule.h"
#include "nsCSSRules.h"
#include "nsICSSNameSpaceRule.h"
#include "nsIUnicharInputStream.h"
#include "nsCSSStyleSheet.h"
#include "mozilla/css/Declaration.h"
#include "nsStyleConsts.h"
#include "nsIURL.h"
#include "nsNetUtil.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsIAtom.h"
#include "nsCOMArray.h"
#include "nsColor.h"
#include "nsCSSPseudoClasses.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSAnonBoxes.h"
#include "nsINameSpaceManager.h"
#include "nsXMLNameSpaceMap.h"
#include "nsThemeConstants.h"
#include "nsContentErrors.h"
#include "nsPrintfCString.h"
#include "nsIMediaList.h"
#include "nsILookAndFeel.h"
#include "nsStyleUtil.h"
#include "nsIPrincipal.h"
#include "prprf.h"
#include "math.h"
#include "nsContentUtils.h"
#include "nsDOMError.h"
#include "nsAutoPtr.h"
#include "nsTArray.h"
#include "prlog.h"
#include "CSSCalc.h"
#include "nsMediaFeatures.h"

namespace css = mozilla::css;

// Flags for ParseVariant method
#define VARIANT_KEYWORD         0x000001  // K
#define VARIANT_LENGTH          0x000002  // L
#define VARIANT_PERCENT         0x000004  // P
#define VARIANT_COLOR           0x000008  // C eCSSUnit_Color, eCSSUnit_Ident (e.g.  "red")
#define VARIANT_URL             0x000010  // U
#define VARIANT_NUMBER          0x000020  // N
#define VARIANT_INTEGER         0x000040  // I
#define VARIANT_ANGLE           0x000080  // G
#define VARIANT_FREQUENCY       0x000100  // F
#define VARIANT_TIME            0x000200  // T
#define VARIANT_STRING          0x000400  // S
#define VARIANT_COUNTER         0x000800  //
#define VARIANT_ATTR            0x001000  //
#define VARIANT_IDENTIFIER      0x002000  // D
#define VARIANT_AUTO            0x010000  // A
#define VARIANT_INHERIT         0x020000  // H eCSSUnit_Initial, eCSSUnit_Inherit
#define VARIANT_NONE            0x040000  // O
#define VARIANT_NORMAL          0x080000  // M
#define VARIANT_SYSFONT         0x100000  // eCSSUnit_System_Font
#define VARIANT_GRADIENT        0x200000  // eCSSUnit_Gradient
#define VARIANT_CUBIC_BEZIER    0x400000  // CSS transition timing function
#define VARIANT_ALL             0x800000  //
#define VARIANT_IMAGE_RECT    0x01000000  // eCSSUnit_Function
// This is an extra bit that says that a VARIANT_ANGLE allows unitless zero:
#define VARIANT_ZERO_ANGLE    0x02000000  // unitless zero for angles
#define VARIANT_CALC          0x04000000  // eCSSUnit_Calc
#define VARIANT_ELEMENT       0x08000000  // eCSSUnit_Element

// Common combinations of variants
#define VARIANT_AL   (VARIANT_AUTO | VARIANT_LENGTH)
#define VARIANT_LP   (VARIANT_LENGTH | VARIANT_PERCENT)
#define VARIANT_AH   (VARIANT_AUTO | VARIANT_INHERIT)
#define VARIANT_AHLP (VARIANT_AH | VARIANT_LP)
#define VARIANT_AHI  (VARIANT_AH | VARIANT_INTEGER)
#define VARIANT_AHK  (VARIANT_AH | VARIANT_KEYWORD)
#define VARIANT_AHKLP (VARIANT_AHLP | VARIANT_KEYWORD)
#define VARIANT_AHL  (VARIANT_AH | VARIANT_LENGTH)
#define VARIANT_AHKL (VARIANT_AHK | VARIANT_LENGTH)
#define VARIANT_HK   (VARIANT_INHERIT | VARIANT_KEYWORD)
#define VARIANT_HKF  (VARIANT_HK | VARIANT_FREQUENCY)
#define VARIANT_HKI  (VARIANT_HK | VARIANT_INTEGER)
#define VARIANT_HKL  (VARIANT_HK | VARIANT_LENGTH)
#define VARIANT_HKLP (VARIANT_HK | VARIANT_LP)
#define VARIANT_HKLPO (VARIANT_HKLP | VARIANT_NONE)
#define VARIANT_HL   (VARIANT_INHERIT | VARIANT_LENGTH)
#define VARIANT_HI   (VARIANT_INHERIT | VARIANT_INTEGER)
#define VARIANT_HLP  (VARIANT_HL | VARIANT_PERCENT)
#define VARIANT_HLPN (VARIANT_HLP | VARIANT_NUMBER)
#define VARIANT_HLPO (VARIANT_HLP | VARIANT_NONE)
#define VARIANT_HTP  (VARIANT_INHERIT | VARIANT_TIME | VARIANT_PERCENT)
#define VARIANT_HMK  (VARIANT_HK | VARIANT_NORMAL)
#define VARIANT_HC   (VARIANT_INHERIT | VARIANT_COLOR)
#define VARIANT_HCK  (VARIANT_HK | VARIANT_COLOR)
#define VARIANT_HUK  (VARIANT_HK | VARIANT_URL)
#define VARIANT_HUO  (VARIANT_INHERIT | VARIANT_URL | VARIANT_NONE)
#define VARIANT_AHUO (VARIANT_AUTO | VARIANT_HUO)
#define VARIANT_HPN  (VARIANT_INHERIT | VARIANT_PERCENT | VARIANT_NUMBER)
#define VARIANT_HN   (VARIANT_INHERIT | VARIANT_NUMBER)
#define VARIANT_HON  (VARIANT_HN | VARIANT_NONE)
#define VARIANT_HOS  (VARIANT_INHERIT | VARIANT_NONE | VARIANT_STRING)
#define VARIANT_LPN  (VARIANT_LP | VARIANT_NUMBER)
#define VARIANT_TIMING_FUNCTION (VARIANT_KEYWORD | VARIANT_CUBIC_BEZIER)
#define VARIANT_UK   (VARIANT_URL | VARIANT_KEYWORD)
#define VARIANT_UO   (VARIANT_URL | VARIANT_NONE)
#define VARIANT_ANGLE_OR_ZERO (VARIANT_ANGLE | VARIANT_ZERO_ANGLE)
#define VARIANT_TRANSFORM_LPCALC (VARIANT_LP | VARIANT_CALC)
#define VARIANT_IMAGE (VARIANT_URL | VARIANT_NONE | VARIANT_GRADIENT | \
                       VARIANT_IMAGE_RECT | VARIANT_ELEMENT)

//----------------------------------------------------------------------

namespace {

// Rule processing function
typedef void (* RuleAppendFunc) (nsICSSRule* aRule, void* aData);
static void AppendRuleToArray(nsICSSRule* aRule, void* aArray);
static void AppendRuleToSheet(nsICSSRule* aRule, void* aParser);

// Your basic top-down recursive descent style parser
// The exposed methods and members of this class are precisely those
// needed by nsCSSParser, far below.
class CSSParserImpl {
public:
  CSSParserImpl();
  ~CSSParserImpl();

  nsresult SetStyleSheet(nsCSSStyleSheet* aSheet);

  nsresult SetQuirkMode(PRBool aQuirkMode);

#ifdef  MOZ_SVG
  nsresult SetSVGMode(PRBool aSVGMode);
#endif

  nsresult SetChildLoader(mozilla::css::Loader* aChildLoader);

  // Clears everything set by the above Set*() functions.
  void Reset();

  nsresult Parse(nsIUnicharInputStream* aInput,
                 nsIURI*                aSheetURI,
                 nsIURI*                aBaseURI,
                 nsIPrincipal*          aSheetPrincipal,
                 PRUint32               aLineNumber,
                 PRBool                 aAllowUnsafeRules);

  nsresult ParseStyleAttribute(const nsAString&  aAttributeValue,
                               nsIURI*           aDocURL,
                               nsIURI*           aBaseURL,
                               nsIPrincipal*     aNodePrincipal,
                               nsICSSStyleRule** aResult);

  nsresult ParseDeclarations(const nsAString&  aBuffer,
                             nsIURI*           aSheetURL,
                             nsIURI*           aBaseURL,
                             nsIPrincipal*     aSheetPrincipal,
                             css::Declaration* aDeclaration,
                             PRBool*           aChanged);

  nsresult ParseRule(const nsAString&        aRule,
                     nsIURI*                 aSheetURL,
                     nsIURI*                 aBaseURL,
                     nsIPrincipal*           aSheetPrincipal,
                     nsCOMArray<nsICSSRule>& aResult);

  nsresult ParseProperty(const nsCSSProperty aPropID,
                         const nsAString& aPropValue,
                         nsIURI* aSheetURL,
                         nsIURI* aBaseURL,
                         nsIPrincipal* aSheetPrincipal,
                         css::Declaration* aDeclaration,
                         PRBool* aChanged,
                         PRBool aIsImportant);

  nsresult ParseMediaList(const nsSubstring& aBuffer,
                          nsIURI* aURL, // for error reporting
                          PRUint32 aLineNumber, // for error reporting
                          nsMediaList* aMediaList,
                          PRBool aHTMLMode);

  nsresult ParseColorString(const nsSubstring& aBuffer,
                            nsIURI* aURL, // for error reporting
                            PRUint32 aLineNumber, // for error reporting
                            nscolor* aColor);

  nsresult ParseSelectorString(const nsSubstring& aSelectorString,
                               nsIURI* aURL, // for error reporting
                               PRUint32 aLineNumber, // for error reporting
                               nsCSSSelectorList **aSelectorList);

protected:
  class nsAutoParseCompoundProperty;
  friend class nsAutoParseCompoundProperty;

  void AppendRule(nsICSSRule* aRule);
  friend void AppendRuleToSheet(nsICSSRule*, void*); // calls AppendRule

  /**
   * This helper class automatically calls SetParsingCompoundProperty in its
   * constructor and takes care of resetting it to false in its destructor.
   */
  class nsAutoParseCompoundProperty {
    public:
      nsAutoParseCompoundProperty(CSSParserImpl* aParser) : mParser(aParser)
      {
        NS_ASSERTION(!aParser->IsParsingCompoundProperty(),
                     "already parsing compound property");
        NS_ASSERTION(aParser, "Null parser?");
        aParser->SetParsingCompoundProperty(PR_TRUE);
      }

      ~nsAutoParseCompoundProperty()
      {
        mParser->SetParsingCompoundProperty(PR_FALSE);
      }
    private:
      CSSParserImpl* mParser;
  };

  void InitScanner(nsIUnicharInputStream* aInput, nsIURI* aSheetURI,
                   PRUint32 aLineNumber, nsIURI* aBaseURI,
                   nsIPrincipal* aSheetPrincipal);
  // the caller must hold on to aBuffer until parsing is done
  void InitScanner(const nsSubstring& aString, nsIURI* aSheetURI,
                   PRUint32 aLineNumber, nsIURI* aBaseURI,
                   nsIPrincipal* aSheetPrincipal);
  void ReleaseScanner(void);
#ifdef MOZ_SVG
  PRBool IsSVGMode() const {
    return mScanner.IsSVGMode();
  }
#endif

  PRBool GetToken(PRBool aSkipWS);
  void UngetToken();

  // get the part in paretheses of the url() function, which is really a
  // part of a token in the CSS grammar, but we're using a combination
  // of the parser and the scanner to do it to handle the backtracking
  // required by the error handling of the tokenization (since if we
  // fail to scan the full token, we should fall back to tokenizing as
  // FUNCTION ... ')').
  // Note that this function WILL WRITE TO aURL IN SOME FAILURE CASES.
  PRBool GetURLInParens(nsString& aURL);

  void AssertInitialState() {
    NS_PRECONDITION(!mHTMLMediaMode, "Bad initial state");
    NS_PRECONDITION(!mParsingCompoundProperty, "Bad initial state");
  }

  PRBool ExpectSymbol(PRUnichar aSymbol, PRBool aSkipWS);
  PRBool ExpectEndProperty();
  PRBool CheckEndProperty();
  nsSubstring* NextIdent();
  void SkipUntil(PRUnichar aStopSymbol);
  void SkipUntilOneOf(const PRUnichar* aStopSymbolChars);
  void SkipRuleSet(PRBool aInsideBraces);
  PRBool SkipAtRule();
  PRBool SkipDeclaration(PRBool aCheckForBraces);

  PRBool PushGroup(nsICSSGroupRule* aRule);
  void PopGroup(void);

  PRBool ParseRuleSet(RuleAppendFunc aAppendFunc, void* aProcessData,
                      PRBool aInsideBraces = PR_FALSE);
  PRBool ParseAtRule(RuleAppendFunc aAppendFunc, void* aProcessData);
  PRBool ParseCharsetRule(RuleAppendFunc aAppendFunc, void* aProcessData);
  PRBool ParseImportRule(RuleAppendFunc aAppendFunc, void* aProcessData);
  PRBool GatherURL(nsString& aURL);
  PRBool GatherMedia(nsMediaList* aMedia,
                     PRUnichar aStopSymbol);
  PRBool ParseMediaQuery(PRUnichar aStopSymbol, nsMediaQuery **aQuery,
                         PRBool *aParsedSomething, PRBool *aHitStop);
  PRBool ParseMediaQueryExpression(nsMediaQuery* aQuery);
  void ProcessImport(const nsString& aURLSpec,
                     nsMediaList* aMedia,
                     RuleAppendFunc aAppendFunc,
                     void* aProcessData);
  PRBool ParseGroupRule(nsICSSGroupRule* aRule, RuleAppendFunc aAppendFunc,
                        void* aProcessData);
  PRBool ParseMediaRule(RuleAppendFunc aAppendFunc, void* aProcessData);
  PRBool ParseMozDocumentRule(RuleAppendFunc aAppendFunc, void* aProcessData);
  PRBool ParseNameSpaceRule(RuleAppendFunc aAppendFunc, void* aProcessData);
  void ProcessNameSpace(const nsString& aPrefix,
                        const nsString& aURLSpec, RuleAppendFunc aAppendFunc,
                        void* aProcessData);

  PRBool ParseFontFaceRule(RuleAppendFunc aAppendFunc, void* aProcessData);
  PRBool ParseFontDescriptor(nsCSSFontFaceRule* aRule);
  PRBool ParseFontDescriptorValue(nsCSSFontDesc aDescID,
                                  nsCSSValue& aValue);

  PRBool ParsePageRule(RuleAppendFunc aAppendFunc, void* aProcessData);

  enum nsSelectorParsingStatus {
    // we have parsed a selector and we saw a token that cannot be
    // part of a selector:
    eSelectorParsingStatus_Done,
    // we should continue parsing the selector:
    eSelectorParsingStatus_Continue,
    // we saw an unexpected token or token value,
    // or we saw end-of-file with an unfinished selector:
    eSelectorParsingStatus_Error
  };
  nsSelectorParsingStatus ParseIDSelector(PRInt32&       aDataMask,
                                          nsCSSSelector& aSelector);

  nsSelectorParsingStatus ParseClassSelector(PRInt32&       aDataMask,
                                             nsCSSSelector& aSelector);

  // aPseudoElement and aPseudoElementArgs are the location where
  // pseudo-elements (as opposed to pseudo-classes) are stored;
  // pseudo-classes are stored on aSelector.  aPseudoElement and
  // aPseudoElementArgs must be non-null iff !aIsNegated.
  nsSelectorParsingStatus ParsePseudoSelector(PRInt32&       aDataMask,
                                              nsCSSSelector& aSelector,
                                              PRBool         aIsNegated,
                                              nsIAtom**      aPseudoElement,
                                              nsPseudoClassList** aPseudoElementArgs,
                                              nsCSSPseudoElements::Type* aPseudoElementType);

  nsSelectorParsingStatus ParseAttributeSelector(PRInt32&       aDataMask,
                                                 nsCSSSelector& aSelector);

  nsSelectorParsingStatus ParseTypeOrUniversalSelector(PRInt32&       aDataMask,
                                                       nsCSSSelector& aSelector,
                                                       PRBool         aIsNegated);

  nsSelectorParsingStatus ParsePseudoClassWithIdentArg(nsCSSSelector& aSelector,
                                                       nsIAtom*       aPseudo,
                                                       nsCSSPseudoClasses::Type aType);

  nsSelectorParsingStatus ParsePseudoClassWithNthPairArg(nsCSSSelector& aSelector,
                                                         nsIAtom*       aPseudo,
                                                         nsCSSPseudoClasses::Type aType);

  nsSelectorParsingStatus ParsePseudoClassWithSelectorListArg(nsCSSSelector& aSelector,
                                                              nsIAtom*       aPseudo,
                                                              nsCSSPseudoClasses::Type aType);

  nsSelectorParsingStatus ParseNegatedSimpleSelector(PRInt32&       aDataMask,
                                                     nsCSSSelector& aSelector);

  // If aStopChar is non-zero, the selector list is done when we hit
  // aStopChar.  Otherwise, it's done when we hit EOF.
  PRBool ParseSelectorList(nsCSSSelectorList*& aListHead,
                           PRUnichar aStopChar);
  PRBool ParseSelectorGroup(nsCSSSelectorList*& aListHead);
  PRBool ParseSelector(nsCSSSelectorList* aList, PRUnichar aPrevCombinator);

  css::Declaration* ParseDeclarationBlock(PRBool aCheckForBraces);
  PRBool ParseDeclaration(css::Declaration* aDeclaration,
                          PRBool aCheckForBraces,
                          PRBool aMustCallValueAppended,
                          PRBool* aChanged);

  PRBool ParseProperty(nsCSSProperty aPropID);
  PRBool ParseSingleValueProperty(nsCSSValue& aValue,
                                  nsCSSProperty aPropID);

  enum PriorityParsingStatus {
    ePriority_None,
    ePriority_Important,
    ePriority_Error
  };
  PriorityParsingStatus ParsePriority();

#ifdef MOZ_XUL
  PRBool ParseTreePseudoElement(nsPseudoClassList **aPseudoElementArgs);
#endif

  void InitBoxPropsAsPhysical(const nsCSSProperty *aSourceProperties);

  // Property specific parsing routines
  PRBool ParseAzimuth(nsCSSValue& aValue);
  PRBool ParseBackground();

  struct BackgroundParseState {
    nsCSSValue&  mColor;
    nsCSSValueList* mImage;
    nsCSSValueList* mRepeat;
    nsCSSValueList* mAttachment;
    nsCSSValueList* mClip;
    nsCSSValueList* mOrigin;
    nsCSSValuePairList* mPosition;
    nsCSSValuePairList* mSize;
    BackgroundParseState(
        nsCSSValue& aColor, nsCSSValueList* aImage, nsCSSValueList* aRepeat,
        nsCSSValueList* aAttachment, nsCSSValueList* aClip,
        nsCSSValueList* aOrigin, nsCSSValuePairList* aPosition,
        nsCSSValuePairList* aSize) :
        mColor(aColor), mImage(aImage), mRepeat(aRepeat),
        mAttachment(aAttachment), mClip(aClip), mOrigin(aOrigin),
        mPosition(aPosition), mSize(aSize) {};
  };

  PRBool ParseBackgroundItem(BackgroundParseState& aState);

  PRBool ParseBackgroundList(nsCSSProperty aPropID); // a single value prop-id
  PRBool ParseBackgroundPosition();
  PRBool ParseBoxPositionValues(nsCSSValuePair& aOut, PRBool aAcceptsInherit);
  PRBool ParseBackgroundSize();
  PRBool ParseBackgroundSizeValues(nsCSSValuePair& aOut);
  PRBool ParseBorderColor();
  PRBool ParseBorderColors(nsCSSProperty aProperty);
  PRBool ParseBorderImage();
  PRBool ParseBorderSpacing();
  PRBool ParseBorderSide(const nsCSSProperty aPropIDs[],
                         PRBool aSetAllSides);
  PRBool ParseDirectionalBorderSide(const nsCSSProperty aPropIDs[],
                                    PRInt32 aSourceType);
  PRBool ParseBorderStyle();
  PRBool ParseBorderWidth();

  PRBool ParseCalc(nsCSSValue &aValue, PRInt32 aVariantMask);
  PRBool ParseCalcAdditiveExpression(nsCSSValue& aValue,
                                     PRInt32& aVariantMask);
  PRBool ParseCalcMultiplicativeExpression(nsCSSValue& aValue,
                                           PRInt32& aVariantMask,
                                           PRBool *aHadFinalWS);
  PRBool ParseCalcTerm(nsCSSValue& aValue, PRInt32& aVariantMask);
  PRBool RequireWhitespace();

  // for 'clip' and '-moz-image-region'
  PRBool ParseRect(nsCSSProperty aPropID);
  PRBool ParseContent();
  PRBool ParseCounterData(nsCSSProperty aPropID);
  PRBool ParseCue();
  PRBool ParseCursor();
  PRBool ParseFont();
  PRBool ParseFontWeight(nsCSSValue& aValue);
  PRBool ParseOneFamily(nsAString& aValue);
  PRBool ParseFamily(nsCSSValue& aValue);
  PRBool ParseFontSrc(nsCSSValue& aValue);
  PRBool ParseFontSrcFormat(nsTArray<nsCSSValue>& values);
  PRBool ParseFontRanges(nsCSSValue& aValue);
  PRBool ParseListStyle();
  PRBool ParseMargin();
  PRBool ParseMarks(nsCSSValue& aValue);
  PRBool ParseMozTransform();
  PRBool ParseOutline();
  PRBool ParseOverflow();
  PRBool ParsePadding();
  PRBool ParsePause();
  PRBool ParseQuotes();
  PRBool ParseSize();
  PRBool ParseTextDecoration(nsCSSValue& aValue);

  PRBool ParseShadowItem(nsCSSValue& aValue, PRBool aIsBoxShadow);
  PRBool ParseShadowList(nsCSSProperty aProperty);
  PRBool ParseTransitionTime(nsCSSProperty aPropID);
  PRBool ParseTransitionProperty();
  PRBool ParseTransition();
  PRBool ParseTransitionTimingFunction();
  PRBool ParseTransitionTimingFunctionValues(nsCSSValue& aValue);
  PRBool ParseTransitionTimingFunctionValueComponent(float& aComponent,
                                                     char aStop,
                                                     PRBool aCheckRange);

#ifdef MOZ_SVG
  PRBool ParsePaint(nsCSSProperty aPropID);
  PRBool ParseDasharray();
  PRBool ParseMarker();
#endif

  // Reused utility parsing routines
  void AppendValue(nsCSSProperty aPropID, const nsCSSValue& aValue);
  PRBool ParseBoxProperties(const nsCSSProperty aPropIDs[]);
  PRBool ParseDirectionalBoxProperty(nsCSSProperty aProperty,
                                     PRInt32 aSourceType);
  PRBool ParseBoxCornerRadius(const nsCSSProperty aPropID);
  PRBool ParseBoxCornerRadii(const nsCSSProperty aPropIDs[]);
  PRInt32 ParseChoice(nsCSSValue aValues[],
                      const nsCSSProperty aPropIDs[], PRInt32 aNumIDs);
  PRBool ParseColor(nsCSSValue& aValue);
  PRBool ParseColorComponent(PRUint8& aComponent,
                             PRInt32& aType, char aStop);
  // ParseHSLColor parses everything starting with the opening '('
  // up through and including the aStop char.
  PRBool ParseHSLColor(nscolor& aColor, char aStop);
  // ParseColorOpacity will enforce that the color ends with a ')'
  // after the opacity
  PRBool ParseColorOpacity(PRUint8& aOpacity);
  PRBool ParseEnum(nsCSSValue& aValue, const PRInt32 aKeywordTable[]);
  PRBool ParseVariant(nsCSSValue& aValue,
                      PRInt32 aVariantMask,
                      const PRInt32 aKeywordTable[]);
  PRBool ParseNonNegativeVariant(nsCSSValue& aValue,
                                 PRInt32 aVariantMask,
                                 const PRInt32 aKeywordTable[]);
  PRBool ParsePositiveNonZeroVariant(nsCSSValue& aValue,
                                     PRInt32 aVariantMask,
                                     const PRInt32 aKeywordTable[]);
  PRBool ParseCounter(nsCSSValue& aValue);
  PRBool ParseAttr(nsCSSValue& aValue);
  PRBool SetValueToURL(nsCSSValue& aValue, const nsString& aURL);
  PRBool ParseURL(nsCSSValue& aValue);
  PRBool TranslateDimension(nsCSSValue& aValue, PRInt32 aVariantMask,
                            float aNumber, const nsString& aUnit);
  PRBool ParseImageRect(nsCSSValue& aImage);
  PRBool ParseElement(nsCSSValue& aValue);
  PRBool ParseColorStop(nsCSSValueGradient* aGradient);
  PRBool ParseGradient(nsCSSValue& aValue, PRBool aIsRadial,
                       PRBool aIsRepeating);

  void SetParsingCompoundProperty(PRBool aBool) {
    NS_ASSERTION(aBool == PR_TRUE || aBool == PR_FALSE, "bad PRBool value");
    mParsingCompoundProperty = aBool;
  }
  PRBool IsParsingCompoundProperty(void) const {
    return mParsingCompoundProperty;
  }

  /* Functions for -moz-transform Parsing */
  PRBool ParseSingleTransform(nsCSSValue& aValue);
  PRBool ParseFunction(const nsString &aFunction, const PRInt32 aAllowedTypes[],
                       PRUint16 aMinElems, PRUint16 aMaxElems,
                       nsCSSValue &aValue);
  PRBool ParseFunctionInternals(const PRInt32 aVariantMask[],
                                PRUint16 aMinElems,
                                PRUint16 aMaxElems,
                                nsTArray<nsCSSValue>& aOutput);

  /* Functions for -moz-transform-origin Parsing */
  PRBool ParseMozTransformOrigin();


  /* Find and return the namespace ID associated with aPrefix.
     If aPrefix has not been declared in an @namespace rule, returns
     kNameSpaceID_Unknown and sets mFoundUnresolvablePrefix to true. */
  PRInt32 GetNamespaceIdForPrefix(const nsString& aPrefix);

  /* Find the correct default namespace, and set it on aSelector. */
  void SetDefaultNamespaceOnSelector(nsCSSSelector& aSelector);

  // Current token. The value is valid after calling GetToken and invalidated
  // by UngetToken.
  nsCSSToken mToken;

  // Our scanner.
  nsCSSScanner mScanner;

  // The URI to be used as a base for relative URIs.
  nsCOMPtr<nsIURI> mBaseURI;

  // The URI to be used as an HTTP "Referer" and for error reporting.
  nsCOMPtr<nsIURI> mSheetURI;

  // The principal of the sheet involved
  nsCOMPtr<nsIPrincipal> mSheetPrincipal;

  // The sheet we're parsing into
  nsRefPtr<nsCSSStyleSheet> mSheet;

  // Used for @import rules
  mozilla::css::Loader* mChildLoader; // not ref counted, it owns us

  // Sheet section we're in.  This is used to enforce correct ordering of the
  // various rule types (eg the fact that a @charset rule must come before
  // anything else).  Note that there are checks of similar things in various
  // places in nsCSSStyleSheet.cpp (e.g in insertRule, RebuildChildList).
  enum nsCSSSection {
    eCSSSection_Charset,
    eCSSSection_Import,
    eCSSSection_NameSpace,
    eCSSSection_General
  };
  nsCSSSection  mSection;

  nsXMLNameSpaceMap *mNameSpaceMap;  // weak, mSheet owns it

  // After an UngetToken is done this flag is true. The next call to
  // GetToken clears the flag.
  PRPackedBool mHavePushBack : 1;

  // True if we are in quirks mode; false in standards or almost standards mode
  PRPackedBool  mNavQuirkMode : 1;

  // True if unsafe rules should be allowed
  PRPackedBool mUnsafeRulesEnabled : 1;

  // True for parsing media lists for HTML attributes, where we have to
  // ignore CSS comments.
  PRPackedBool mHTMLMediaMode : 1;

  // This flag is set when parsing a non-box shorthand; it's used to not apply
  // some quirks during shorthand parsing
  PRPackedBool  mParsingCompoundProperty : 1;

  // GetNamespaceIdForPrefix will set mFoundUnresolvablePrefix to true
  // when it encounters a prefix that is not mapped to a namespace.
  PRPackedBool  mFoundUnresolvablePrefix : 1;

#ifdef DEBUG
  PRPackedBool mScannerInited : 1;
#endif

  // Stack of rule groups; used for @media and such.
  nsCOMArray<nsICSSGroupRule> mGroupStack;

  // During the parsing of a property (which may be a shorthand), the data
  // are stored in |mTempData|.  (It is needed to ensure that parser
  // errors cause the data to be ignored, and to ensure that a
  // non-'!important' declaration does not override an '!important'
  // one.)
  nsCSSExpandedDataBlock mTempData;

  // All data from successfully parsed properties are placed into |mData|.
  nsCSSExpandedDataBlock mData;

public:
  // Used from nsCSSParser constructors and destructors
  CSSParserImpl* mNextFree;
};

static void AppendRuleToArray(nsICSSRule* aRule, void* aArray)
{
  static_cast<nsCOMArray<nsICSSRule>*>(aArray)->AppendObject(aRule);
}

static void AppendRuleToSheet(nsICSSRule* aRule, void* aParser)
{
  CSSParserImpl* parser = (CSSParserImpl*) aParser;
  parser->AppendRule(aRule);
}

#ifdef CSS_REPORT_PARSE_ERRORS

#define REPORT_UNEXPECTED(msg_) \
  mScanner.ReportUnexpected(#msg_)

#define REPORT_UNEXPECTED_P(msg_, params_) \
  mScanner.ReportUnexpectedParams(#msg_, params_, NS_ARRAY_LENGTH(params_))

#define REPORT_UNEXPECTED_EOF(lf_) \
  mScanner.ReportUnexpectedEOF(#lf_)

#define REPORT_UNEXPECTED_EOF_CHAR(ch_) \
  mScanner.ReportUnexpectedEOF(ch_)

#define REPORT_UNEXPECTED_TOKEN(msg_) \
  mScanner.ReportUnexpectedToken(mToken, #msg_)

#define REPORT_UNEXPECTED_TOKEN_P(msg_, params_) \
  mScanner.ReportUnexpectedTokenParams(mToken, #msg_, \
                                       params_, NS_ARRAY_LENGTH(params_))


#define OUTPUT_ERROR() \
  mScanner.OutputError()

#define CLEAR_ERROR() \
  mScanner.ClearError()

#else

#define REPORT_UNEXPECTED(msg_)
#define REPORT_UNEXPECTED_P(msg_, params_)
#define REPORT_UNEXPECTED_EOF(lf_)
#define REPORT_UNEXPECTED_EOF_CHAR(ch_)
#define REPORT_UNEXPECTED_TOKEN(msg_)
#define REPORT_UNEXPECTED_TOKEN_P(msg_, params_)
#define OUTPUT_ERROR()
#define CLEAR_ERROR()

#endif

CSSParserImpl::CSSParserImpl()
  : mToken(),
    mScanner(),
    mChildLoader(nsnull),
    mSection(eCSSSection_Charset),
    mNameSpaceMap(nsnull),
    mHavePushBack(PR_FALSE),
    mNavQuirkMode(PR_FALSE),
    mUnsafeRulesEnabled(PR_FALSE),
    mHTMLMediaMode(PR_FALSE),
    mParsingCompoundProperty(PR_FALSE),
    mFoundUnresolvablePrefix(PR_FALSE)
#ifdef DEBUG
    , mScannerInited(PR_FALSE)
#endif
    , mNextFree(nsnull)
{
}

CSSParserImpl::~CSSParserImpl()
{
  mData.AssertInitialState();
  mTempData.AssertInitialState();
}

nsresult
CSSParserImpl::SetStyleSheet(nsCSSStyleSheet* aSheet)
{
  if (aSheet != mSheet) {
    // Switch to using the new sheet, if any
    mGroupStack.Clear();
    mSheet = aSheet;
    if (mSheet) {
      mNameSpaceMap = mSheet->GetNameSpaceMap();
    } else {
      mNameSpaceMap = nsnull;
    }
  }

  return NS_OK;
}

nsresult
CSSParserImpl::SetQuirkMode(PRBool aQuirkMode)
{
  NS_ASSERTION(aQuirkMode == PR_TRUE || aQuirkMode == PR_FALSE, "bad PRBool value");
  mNavQuirkMode = aQuirkMode;
  return NS_OK;
}

#ifdef MOZ_SVG
nsresult
CSSParserImpl::SetSVGMode(PRBool aSVGMode)
{
  NS_ASSERTION(aSVGMode == PR_TRUE || aSVGMode == PR_FALSE,
               "bad PRBool value");
  mScanner.SetSVGMode(aSVGMode);
  return NS_OK;
}
#endif

nsresult
CSSParserImpl::SetChildLoader(mozilla::css::Loader* aChildLoader)
{
  mChildLoader = aChildLoader;  // not ref counted, it owns us
  return NS_OK;
}

void
CSSParserImpl::Reset()
{
  NS_ASSERTION(! mScannerInited, "resetting with scanner active");
  SetStyleSheet(nsnull);
  SetQuirkMode(PR_FALSE);
#ifdef MOZ_SVG
  SetSVGMode(PR_FALSE);
#endif // MOZ_SVG
  SetChildLoader(nsnull);
}

void
CSSParserImpl::InitScanner(nsIUnicharInputStream* aInput, nsIURI* aSheetURI,
                           PRUint32 aLineNumber, nsIURI* aBaseURI,
                           nsIPrincipal* aSheetPrincipal)
{
  NS_ASSERTION(! mScannerInited, "already have scanner");

  mScanner.Init(aInput, nsnull, 0, aSheetURI, aLineNumber, mSheet,
                mChildLoader);
#ifdef DEBUG
  mScannerInited = PR_TRUE;
#endif
  mBaseURI = aBaseURI;
  mSheetURI = aSheetURI;
  mSheetPrincipal = aSheetPrincipal;

  mHavePushBack = PR_FALSE;
}

void
CSSParserImpl::InitScanner(const nsSubstring& aString, nsIURI* aSheetURI,
                           PRUint32 aLineNumber, nsIURI* aBaseURI,
                           nsIPrincipal* aSheetPrincipal)
{
  // Having it not own the string is OK since the caller will hold on to
  // the stream until we're done parsing.
  NS_ASSERTION(! mScannerInited, "already have scanner");

  mScanner.Init(nsnull, aString.BeginReading(), aString.Length(), aSheetURI,
                aLineNumber, mSheet, mChildLoader);

#ifdef DEBUG
  mScannerInited = PR_TRUE;
#endif
  mBaseURI = aBaseURI;
  mSheetURI = aSheetURI;
  mSheetPrincipal = aSheetPrincipal;

  mHavePushBack = PR_FALSE;
}

void
CSSParserImpl::ReleaseScanner(void)
{
  mScanner.Close();
#ifdef DEBUG
  mScannerInited = PR_FALSE;
#endif
  mBaseURI = nsnull;
  mSheetURI = nsnull;
  mSheetPrincipal = nsnull;
}


nsresult
CSSParserImpl::Parse(nsIUnicharInputStream* aInput,
                     nsIURI*                aSheetURI,
                     nsIURI*                aBaseURI,
                     nsIPrincipal*          aSheetPrincipal,
                     PRUint32               aLineNumber,
                     PRBool                 aAllowUnsafeRules)
{
  NS_PRECONDITION(aSheetPrincipal, "Must have principal here!");

  NS_ASSERTION(nsnull != aBaseURI, "need base URI");
  NS_ASSERTION(nsnull != aSheetURI, "need sheet URI");
  AssertInitialState();

  NS_PRECONDITION(mSheet, "Must have sheet to parse into");
  NS_ENSURE_STATE(mSheet);

#ifdef DEBUG
  nsIURI* uri = mSheet->GetSheetURI();
  PRBool equal;
  NS_ASSERTION(NS_SUCCEEDED(aSheetURI->Equals(uri, &equal)) && equal,
               "Sheet URI does not match passed URI");
  NS_ASSERTION(NS_SUCCEEDED(mSheet->Principal()->Equals(aSheetPrincipal,
                                                        &equal)) &&
               equal,
               "Sheet principal does not match passed principal");
#endif

  InitScanner(aInput, aSheetURI, aLineNumber, aBaseURI, aSheetPrincipal);

  PRInt32 ruleCount = mSheet->StyleRuleCount();
  if (0 < ruleCount) {
    nsICSSRule* lastRule = nsnull;
    mSheet->GetStyleRuleAt(ruleCount - 1, lastRule);
    if (lastRule) {
      switch (lastRule->GetType()) {
        case nsICSSRule::CHARSET_RULE:
        case nsICSSRule::IMPORT_RULE:
          mSection = eCSSSection_Import;
          break;
        case nsICSSRule::NAMESPACE_RULE:
          mSection = eCSSSection_NameSpace;
          break;
        default:
          mSection = eCSSSection_General;
          break;
      }
      NS_RELEASE(lastRule);
    }
  }
  else {
    mSection = eCSSSection_Charset; // sheet is empty, any rules are fair
  }

  mUnsafeRulesEnabled = aAllowUnsafeRules;

  nsCSSToken* tk = &mToken;
  for (;;) {
    // Get next non-whitespace token
    if (!GetToken(PR_TRUE)) {
      OUTPUT_ERROR();
      break;
    }
    if (eCSSToken_HTMLComment == tk->mType) {
      continue; // legal here only
    }
    if (eCSSToken_AtKeyword == tk->mType) {
      ParseAtRule(AppendRuleToSheet, this);
      continue;
    }
    UngetToken();
    if (ParseRuleSet(AppendRuleToSheet, this)) {
      mSection = eCSSSection_General;
    }
  }
  ReleaseScanner();

  mUnsafeRulesEnabled = PR_FALSE;

  // XXX check for low level errors
  return NS_OK;
}

/**
 * Determines whether the identifier contained in the given string is a
 * vendor-specific identifier, as described in CSS 2.1 section 4.1.2.1.
 */
static PRBool
NonMozillaVendorIdentifier(const nsAString& ident)
{
  return (ident.First() == PRUnichar('-') &&
          !StringBeginsWith(ident, NS_LITERAL_STRING("-moz-"))) ||
         ident.First() == PRUnichar('_');

}

nsresult
CSSParserImpl::ParseStyleAttribute(const nsAString& aAttributeValue,
                                   nsIURI*                  aDocURI,
                                   nsIURI*                  aBaseURI,
                                   nsIPrincipal*            aNodePrincipal,
                                   nsICSSStyleRule**        aResult)
{
  NS_PRECONDITION(aNodePrincipal, "Must have principal here!");
  AssertInitialState();

  NS_ASSERTION(nsnull != aBaseURI, "need base URI");

  // XXX line number?
  InitScanner(aAttributeValue, aDocURI, 0, aBaseURI, aNodePrincipal);

  mSection = eCSSSection_General;

  // In quirks mode, allow style declarations to have braces or not
  // (bug 99554).
  PRBool haveBraces;
  if (mNavQuirkMode && GetToken(PR_TRUE)) {
    haveBraces = eCSSToken_Symbol == mToken.mType &&
                 '{' == mToken.mSymbol;
    UngetToken();
  }
  else {
    haveBraces = PR_FALSE;
  }

  css::Declaration* declaration = ParseDeclarationBlock(haveBraces);
  if (declaration) {
    // Create a style rule for the declaration
    *aResult = NS_NewCSSStyleRule(nsnull, declaration).get();
  } else {
    *aResult = nsnull;
  }

  ReleaseScanner();

  // XXX check for low level errors
  return NS_OK;
}

nsresult
CSSParserImpl::ParseDeclarations(const nsAString&  aBuffer,
                                 nsIURI*           aSheetURI,
                                 nsIURI*           aBaseURI,
                                 nsIPrincipal*     aSheetPrincipal,
                                 css::Declaration* aDeclaration,
                                 PRBool*           aChanged)
{
  NS_PRECONDITION(aSheetPrincipal, "Must have principal here!");
  AssertInitialState();

  *aChanged = PR_FALSE;

  InitScanner(aBuffer, aSheetURI, 0, aBaseURI, aSheetPrincipal);

  mSection = eCSSSection_General;

  mData.AssertInitialState();
  aDeclaration->ClearData();
  // We could check if it was already empty, but...
  *aChanged = PR_TRUE;

  nsresult rv = NS_OK;
  for (;;) {
    // If we cleared the old decl, then we want to be calling
    // ValueAppended as we parse.
    if (!ParseDeclaration(aDeclaration, PR_FALSE, PR_TRUE, aChanged)) {
      rv = mScanner.GetLowLevelError();
      if (NS_FAILED(rv))
        break;

      if (!SkipDeclaration(PR_FALSE)) {
        rv = mScanner.GetLowLevelError();
        break;
      }
    }
  }

  aDeclaration->CompressFrom(&mData);
  ReleaseScanner();
  return rv;
}

nsresult
CSSParserImpl::ParseRule(const nsAString&        aRule,
                         nsIURI*                 aSheetURI,
                         nsIURI*                 aBaseURI,
                         nsIPrincipal*           aSheetPrincipal,
                         nsCOMArray<nsICSSRule>& aResult)
{
  NS_PRECONDITION(aSheetPrincipal, "Must have principal here!");
  AssertInitialState();

  NS_ASSERTION(nsnull != aBaseURI, "need base URI");

  InitScanner(aRule, aSheetURI, 0, aBaseURI, aSheetPrincipal);

  mSection = eCSSSection_Charset; // callers are responsible for rejecting invalid rules.

  nsCSSToken* tk = &mToken;
  // Get first non-whitespace token
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED(PEParseRuleWSOnly);
    OUTPUT_ERROR();
  } else if (eCSSToken_AtKeyword == tk->mType) {
    ParseAtRule(AppendRuleToArray, &aResult);
  }
  else {
    UngetToken();
    ParseRuleSet(AppendRuleToArray, &aResult);
  }
  OUTPUT_ERROR();
  ReleaseScanner();
  // XXX check for low-level errors
  return NS_OK;
}

nsresult
CSSParserImpl::ParseProperty(const nsCSSProperty aPropID,
                             const nsAString& aPropValue,
                             nsIURI* aSheetURI,
                             nsIURI* aBaseURI,
                             nsIPrincipal* aSheetPrincipal,
                             css::Declaration* aDeclaration,
                             PRBool* aChanged,
                             PRBool aIsImportant)
{
  NS_PRECONDITION(aSheetPrincipal, "Must have principal here!");
  NS_PRECONDITION(aBaseURI, "need base URI");
  NS_PRECONDITION(aDeclaration, "Need declaration to parse into!");
  AssertInitialState();
  mData.AssertInitialState();
  mTempData.AssertInitialState();
  aDeclaration->AssertMutable();

  InitScanner(aPropValue, aSheetURI, 0, aBaseURI, aSheetPrincipal);
  mSection = eCSSSection_General;

  *aChanged = PR_FALSE;

  if (eCSSProperty_UNKNOWN == aPropID) { // unknown property
    NS_ConvertASCIItoUTF16 propName(nsCSSProps::GetStringValue(aPropID));
    const PRUnichar *params[] = {
      propName.get()
    };
    REPORT_UNEXPECTED_P(PEUnknownProperty, params);
    REPORT_UNEXPECTED(PEDeclDropped);
    OUTPUT_ERROR();
    ReleaseScanner();
    return NS_OK;
  }

  PRBool parsedOK = ParseProperty(aPropID);
  // We should now be at EOF
  if (parsedOK && GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEExpectEndValue);
    parsedOK = PR_FALSE;
  }

  if (!parsedOK) {
    NS_ConvertASCIItoUTF16 propName(nsCSSProps::GetStringValue(aPropID));
    const PRUnichar *params[] = {
      propName.get()
    };
    REPORT_UNEXPECTED_P(PEValueParsingError, params);
    REPORT_UNEXPECTED(PEDeclDropped);
    OUTPUT_ERROR();
    mTempData.ClearProperty(aPropID);
  } else {

    // We know we don't need to force a ValueAppended call for the new
    // value.  So if we are not processing a shorthand, and there's
    // already a value for this property in the declaration at the
    // same importance level, then we can just copy our parsed value
    // directly into the declaration without going through the whole
    // expand/compress thing.
    if (!aDeclaration->TryReplaceValue(aPropID, aIsImportant, mTempData,
                                       aChanged)) {
      // Do it the slow way
      aDeclaration->ExpandTo(&mData);
      *aChanged = mData.TransferFromBlock(mTempData, aPropID, aIsImportant,
                                          PR_TRUE, PR_FALSE, aDeclaration);
      aDeclaration->CompressFrom(&mData);
    }
    CLEAR_ERROR();
  }

  mTempData.AssertInitialState();

  nsresult result = mScanner.GetLowLevelError();
  ReleaseScanner();
  return result;
}

nsresult
CSSParserImpl::ParseMediaList(const nsSubstring& aBuffer,
                              nsIURI* aURI, // for error reporting
                              PRUint32 aLineNumber, // for error reporting
                              nsMediaList* aMediaList,
                              PRBool aHTMLMode)
{
  // XXX Are there cases where the caller wants to keep what it already
  // has in case of parser error?
  aMediaList->Clear();

  // fake base URI since media lists don't have URIs in them
  InitScanner(aBuffer, aURI, aLineNumber, aURI, nsnull);

  AssertInitialState();
  NS_ASSERTION(aHTMLMode == PR_TRUE || aHTMLMode == PR_FALSE,
               "invalid PRBool");
  mHTMLMediaMode = aHTMLMode;

    // XXXldb We need to make the scanner not skip CSS comments!  (Or
    // should we?)

  // For aHTMLMode, we used to follow the parsing rules in
  // http://www.w3.org/TR/1999/REC-html401-19991224/types.html#type-media-descriptors
  // which wouldn't work for media queries since they remove all but the
  // first word.  However, they're changed in
  // http://www.whatwg.org/specs/web-apps/current-work/multipage/section-document.html#media2
  // (as of 2008-05-29) which says that the media attribute just points
  // to a media query.  (The main substative difference is the relative
  // precedence of commas and paretheses.)

  if (!GatherMedia(aMediaList, PRUnichar(0))) {
    aMediaList->Clear();
    aMediaList->SetNonEmpty(); // don't match anything
    if (!mHTMLMediaMode) {
      OUTPUT_ERROR();
    }
  }
  nsresult rv = mScanner.GetLowLevelError();
  CLEAR_ERROR();
  ReleaseScanner();
  mHTMLMediaMode = PR_FALSE;

  return rv;
}

nsresult
CSSParserImpl::ParseColorString(const nsSubstring& aBuffer,
                                nsIURI* aURI, // for error reporting
                                PRUint32 aLineNumber, // for error reporting
                                nscolor* aColor)
{
  AssertInitialState();
  InitScanner(aBuffer, aURI, aLineNumber, aURI, nsnull);

  nsCSSValue value;
  PRBool colorParsed = ParseColor(value);
  nsresult rv = mScanner.GetLowLevelError();
  OUTPUT_ERROR();
  ReleaseScanner();

  if (!colorParsed) {
    return NS_FAILED(rv) ? rv : NS_ERROR_FAILURE;
  }

  if (value.GetUnit() == eCSSUnit_Ident) {
    nscolor rgba;
    if (NS_ColorNameToRGB(nsDependentString(value.GetStringBufferValue()), &rgba)) {
      (*aColor) = rgba;
      rv = NS_OK;
    }
  } else if (value.GetUnit() == eCSSUnit_Color) {
    (*aColor) = value.GetColorValue();
    rv = NS_OK;
  } else if (value.GetUnit() == eCSSUnit_EnumColor) {
    PRInt32 intValue = value.GetIntValue();
    if (intValue >= 0) {
      nsCOMPtr<nsILookAndFeel> lfSvc = do_GetService("@mozilla.org/widget/lookandfeel;1");
      if (lfSvc) {
        nscolor rgba;
        rv = lfSvc->GetColor((nsILookAndFeel::nsColorID) value.GetIntValue(), rgba);
        if (NS_SUCCEEDED(rv))
          (*aColor) = rgba;
      }
    } else {
      // XXX - this is NS_COLOR_CURRENTCOLOR, NS_COLOR_MOZ_HYPERLINKTEXT, etc.
      // which we don't handle as per the ParseColorString definition.  Should
      // remove this limitation at some point.
      rv = NS_ERROR_FAILURE;
    }
  }

  return rv;
}

nsresult
CSSParserImpl::ParseSelectorString(const nsSubstring& aSelectorString,
                                   nsIURI* aURI, // for error reporting
                                   PRUint32 aLineNumber, // for error reporting
                                   nsCSSSelectorList **aSelectorList)
{
  InitScanner(aSelectorString, aURI, aLineNumber, aURI, nsnull);

  AssertInitialState();

  // This is the only place that cares about mFoundUnresolvablePrefix,
  // so this is the only place that bothers clearing it.
  mFoundUnresolvablePrefix = PR_FALSE;

  PRBool success = ParseSelectorList(*aSelectorList, PRUnichar(0));
  PRBool prefixErr = mFoundUnresolvablePrefix;

  OUTPUT_ERROR();
  ReleaseScanner();

  if (success) {
    NS_ASSERTION(*aSelectorList, "Should have list!");
    return NS_OK;
  }

  NS_ASSERTION(!*aSelectorList, "Shouldn't have list!");
  if (prefixErr)
    return NS_ERROR_DOM_NAMESPACE_ERR;

  return NS_ERROR_DOM_SYNTAX_ERR;
}

//----------------------------------------------------------------------

PRBool
CSSParserImpl::GetToken(PRBool aSkipWS)
{
  for (;;) {
    if (!mHavePushBack) {
      if (!mScanner.Next(mToken)) {
        break;
      }
    }
    mHavePushBack = PR_FALSE;
    if (aSkipWS && (eCSSToken_WhiteSpace == mToken.mType)) {
      continue;
    }
    return PR_TRUE;
  }
  return PR_FALSE;
}

PRBool
CSSParserImpl::GetURLInParens(nsString& aURL)
{
  NS_ASSERTION(!mHavePushBack, "mustn't have pushback at this point");
  do {
    if (! mScanner.NextURL(mToken)) {
      // EOF
      return PR_FALSE;
    }
  } while (eCSSToken_WhiteSpace == mToken.mType);

  aURL = mToken.mIdent;

  if ((eCSSToken_String != mToken.mType && eCSSToken_URL != mToken.mType) ||
      !ExpectSymbol(')', PR_TRUE)) {
    // in the failure case, we do not have to match parentheses, since
    // this is now an invalid URL token.
    SkipUntil(')');
    return PR_FALSE;
  }

  return PR_TRUE;
}

void
CSSParserImpl::UngetToken()
{
  NS_PRECONDITION(!mHavePushBack, "double pushback");
  mHavePushBack = PR_TRUE;
}

PRBool
CSSParserImpl::ExpectSymbol(PRUnichar aSymbol,
                            PRBool aSkipWS)
{
  if (!GetToken(aSkipWS)) {
    // CSS2.1 specifies that all "open constructs" are to be closed at
    // EOF.  It simplifies higher layers if we claim to have found an
    // ), ], }, or ; if we encounter EOF while looking for one of them.
    // Do still issue a diagnostic, to aid debugging.
    if (aSymbol == ')' || aSymbol == ']' ||
        aSymbol == '}' || aSymbol == ';') {
      REPORT_UNEXPECTED_EOF_CHAR(aSymbol);
      return PR_TRUE;
    }
    else
      return PR_FALSE;
  }
  if (mToken.IsSymbol(aSymbol)) {
    return PR_TRUE;
  }
  UngetToken();
  return PR_FALSE;
}

// Checks to see if we're at the end of a property.  If an error occurs during
// the check, does not signal a parse error.
PRBool
CSSParserImpl::CheckEndProperty()
{
  if (!GetToken(PR_TRUE)) {
    return PR_TRUE; // properties may end with eof
  }
  if ((eCSSToken_Symbol == mToken.mType) &&
      ((';' == mToken.mSymbol) ||
       ('!' == mToken.mSymbol) ||
       ('}' == mToken.mSymbol))) {
    // XXX need to verify that ! is only followed by "important [;|}]
    // XXX this requires a multi-token pushback buffer
    UngetToken();
    return PR_TRUE;
  }
  UngetToken();
  return PR_FALSE;
}

// Checks if we're at the end of a property, raising an error if we're not.
PRBool
CSSParserImpl::ExpectEndProperty()
{
  if (CheckEndProperty())
    return PR_TRUE;

  // If we're here, we read something incorrect, so we should report it.
  REPORT_UNEXPECTED_TOKEN(PEExpectEndValue);
  return PR_FALSE;
}

// Parses the priority suffix on a property, which at present may be
// either '!important' or nothing.
CSSParserImpl::PriorityParsingStatus
CSSParserImpl::ParsePriority()
{
  if (!GetToken(PR_TRUE)) {
    return ePriority_None; // properties may end with EOF
  }
  if (!mToken.IsSymbol('!')) {
    UngetToken();
    return ePriority_None; // dunno what it is, but it's not a priority
  }

  if (!GetToken(PR_TRUE)) {
    // EOF is not ok after !
    REPORT_UNEXPECTED_EOF(PEImportantEOF);
    return ePriority_Error;
  }

  if (mToken.mType != eCSSToken_Ident ||
      !mToken.mIdent.LowerCaseEqualsLiteral("important")) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedImportant);
    UngetToken();
    return ePriority_Error;
  }

  return ePriority_Important;
}

nsSubstring*
CSSParserImpl::NextIdent()
{
  // XXX Error reporting?
  if (!GetToken(PR_TRUE)) {
    return nsnull;
  }
  if (eCSSToken_Ident != mToken.mType) {
    UngetToken();
    return nsnull;
  }
  return &mToken.mIdent;
}

PRBool
CSSParserImpl::SkipAtRule()
{
  for (;;) {
    if (!GetToken(PR_TRUE)) {
      REPORT_UNEXPECTED_EOF(PESkipAtRuleEOF);
      return PR_FALSE;
    }
    if (eCSSToken_Symbol == mToken.mType) {
      PRUnichar symbol = mToken.mSymbol;
      if (symbol == ';') {
        break;
      }
      if (symbol == '{') {
        SkipUntil('}');
        break;
      } else if (symbol == '(') {
        SkipUntil(')');
      } else if (symbol == '[') {
        SkipUntil(']');
      }
    } else if (eCSSToken_Function == mToken.mType) {
      SkipUntil(')');
    }
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseAtRule(RuleAppendFunc aAppendFunc,
                           void* aData)
{
  nsCSSSection newSection;
  PRBool (CSSParserImpl::*parseFunc)(RuleAppendFunc, void*);

  if ((mSection <= eCSSSection_Charset) &&
      (mToken.mIdent.LowerCaseEqualsLiteral("charset"))) {
    parseFunc = &CSSParserImpl::ParseCharsetRule;
    newSection = eCSSSection_Import;  // only one charset allowed

  } else if ((mSection <= eCSSSection_Import) &&
             mToken.mIdent.LowerCaseEqualsLiteral("import")) {
    parseFunc = &CSSParserImpl::ParseImportRule;
    newSection = eCSSSection_Import;

  } else if ((mSection <= eCSSSection_NameSpace) &&
             mToken.mIdent.LowerCaseEqualsLiteral("namespace")) {
    parseFunc = &CSSParserImpl::ParseNameSpaceRule;
    newSection = eCSSSection_NameSpace;

  } else if (mToken.mIdent.LowerCaseEqualsLiteral("media")) {
    parseFunc = &CSSParserImpl::ParseMediaRule;
    newSection = eCSSSection_General;

  } else if (mToken.mIdent.LowerCaseEqualsLiteral("-moz-document")) {
    parseFunc = &CSSParserImpl::ParseMozDocumentRule;
    newSection = eCSSSection_General;

  } else if (mToken.mIdent.LowerCaseEqualsLiteral("font-face")) {
    parseFunc = &CSSParserImpl::ParseFontFaceRule;
    newSection = eCSSSection_General;

  } else if (mToken.mIdent.LowerCaseEqualsLiteral("page")) {
    parseFunc = &CSSParserImpl::ParsePageRule;
    newSection = eCSSSection_General;

  } else {
    if (!NonMozillaVendorIdentifier(mToken.mIdent)) {
      REPORT_UNEXPECTED_TOKEN(PEUnknownAtRule);
      OUTPUT_ERROR();
    }
    // Skip over unsupported at rule, don't advance section
    return SkipAtRule();
  }

  if (!(this->*parseFunc)(aAppendFunc, aData)) {
    // Skip over invalid at rule, don't advance section
    OUTPUT_ERROR();
    return SkipAtRule();
  }

  mSection = newSection;
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseCharsetRule(RuleAppendFunc aAppendFunc,
                                void* aData)
{
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PECharsetRuleEOF);
    return PR_FALSE;
  }

  if (eCSSToken_String != mToken.mType) {
    REPORT_UNEXPECTED_TOKEN(PECharsetRuleNotString);
    return PR_FALSE;
  }

  nsAutoString charset = mToken.mIdent;

  if (!ExpectSymbol(';', PR_TRUE)) {
    return PR_FALSE;
  }

  nsCOMPtr<nsICSSRule> rule;
  NS_NewCSSCharsetRule(getter_AddRefs(rule), charset);

  if (rule) {
    (*aAppendFunc)(rule, aData);
  }

  return PR_TRUE;
}

PRBool
CSSParserImpl::GatherURL(nsString& aURL)
{
  if (!GetToken(PR_TRUE)) {
    return PR_FALSE;
  }
  if (eCSSToken_String == mToken.mType) {
    aURL = mToken.mIdent;
    return PR_TRUE;
  }
  else if (eCSSToken_Function == mToken.mType &&
           mToken.mIdent.LowerCaseEqualsLiteral("url") &&
           GetURLInParens(aURL)) {
    return PR_TRUE;
  }
  return PR_FALSE;
}

PRBool
CSSParserImpl::ParseMediaQuery(PRUnichar aStopSymbol,
                               nsMediaQuery **aQuery,
                               PRBool *aParsedSomething,
                               PRBool *aHitStop)
{
  *aQuery = nsnull;
  *aParsedSomething = PR_FALSE;
  *aHitStop = PR_FALSE;

  // "If the comma-separated list is the empty list it is assumed to
  // specify the media query 'all'."  (css3-mediaqueries, section
  // "Media Queries")
  if (!GetToken(PR_TRUE)) {
    *aHitStop = PR_TRUE;
    // expected termination by EOF
    if (aStopSymbol == PRUnichar(0))
      return PR_TRUE;

    // unexpected termination by EOF
    REPORT_UNEXPECTED_EOF(PEGatherMediaEOF);
    return PR_TRUE;
  }

  if (eCSSToken_Symbol == mToken.mType &&
      mToken.mSymbol == aStopSymbol) {
    *aHitStop = PR_TRUE;
    UngetToken();
    return PR_TRUE;
  }
  UngetToken();

  *aParsedSomething = PR_TRUE;

  nsAutoPtr<nsMediaQuery> query(new nsMediaQuery);
  if (!query) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  if (ExpectSymbol('(', PR_TRUE)) {
    // we got an expression without a media type
    UngetToken(); // so ParseMediaQueryExpression can handle it
    query->SetType(nsGkAtoms::all);
    query->SetTypeOmitted();
    // Just parse the first expression here.
    if (!ParseMediaQueryExpression(query)) {
      OUTPUT_ERROR();
      query->SetHadUnknownExpression();
    }
  } else {
    nsCOMPtr<nsIAtom> mediaType;
    PRBool gotNotOrOnly = PR_FALSE;
    for (;;) {
      if (!GetToken(PR_TRUE)) {
        REPORT_UNEXPECTED_EOF(PEGatherMediaEOF);
        return PR_FALSE;
      }
      if (eCSSToken_Ident != mToken.mType) {
        REPORT_UNEXPECTED_TOKEN(PEGatherMediaNotIdent);
        UngetToken();
        return PR_FALSE;
      }
      // case insensitive from CSS - must be lower cased
      nsContentUtils::ASCIIToLower(mToken.mIdent);
      mediaType = do_GetAtom(mToken.mIdent);
      if (gotNotOrOnly ||
          (mediaType != nsGkAtoms::_not && mediaType != nsGkAtoms::only))
        break;
      gotNotOrOnly = PR_TRUE;
      if (mediaType == nsGkAtoms::_not)
        query->SetNegated();
      else
        query->SetHasOnly();
    }
    query->SetType(mediaType);
  }

  for (;;) {
    if (!GetToken(PR_TRUE)) {
      *aHitStop = PR_TRUE;
      // expected termination by EOF
      if (aStopSymbol == PRUnichar(0))
        break;

      // unexpected termination by EOF
      REPORT_UNEXPECTED_EOF(PEGatherMediaEOF);
      break;
    }

    if (eCSSToken_Symbol == mToken.mType &&
        mToken.mSymbol == aStopSymbol) {
      *aHitStop = PR_TRUE;
      UngetToken();
      break;
    }
    if (eCSSToken_Symbol == mToken.mType && mToken.mSymbol == ',') {
      // Done with the expressions for this query
      break;
    }
    if (eCSSToken_Ident != mToken.mType ||
        !mToken.mIdent.LowerCaseEqualsLiteral("and")) {
      REPORT_UNEXPECTED_TOKEN(PEGatherMediaNotComma);
      UngetToken();
      return PR_FALSE;
    }
    if (!ParseMediaQueryExpression(query)) {
      OUTPUT_ERROR();
      query->SetHadUnknownExpression();
    }
  }
  *aQuery = query.forget();
  return PR_TRUE;
}

// Returns false only when there is a low-level error in the scanner
// (out-of-memory).
PRBool
CSSParserImpl::GatherMedia(nsMediaList* aMedia,
                           PRUnichar aStopSymbol)
{
  for (;;) {
    nsAutoPtr<nsMediaQuery> query;
    PRBool parsedSomething, hitStop;
    if (!ParseMediaQuery(aStopSymbol, getter_Transfers(query),
                         &parsedSomething, &hitStop)) {
      NS_ASSERTION(!hitStop, "should return true when hit stop");
      if (NS_FAILED(mScanner.GetLowLevelError())) {
        return PR_FALSE;
      }
      const PRUnichar stopChars[] =
        { PRUnichar(','), aStopSymbol /* may be null */, PRUnichar(0) };
      SkipUntilOneOf(stopChars);
      // Rely on SkipUntilOneOf leaving mToken around as the last token read.
      if (mToken.mType == eCSSToken_Symbol && mToken.mSymbol == aStopSymbol) {
        UngetToken();
        hitStop = PR_TRUE;
      }
    }
    if (parsedSomething) {
      aMedia->SetNonEmpty();
    }
    if (query) {
      nsresult rv = aMedia->AppendQuery(query);
      if (NS_FAILED(rv)) {
        mScanner.SetLowLevelError(rv);
        return PR_FALSE;
      }
    }
    if (hitStop) {
      break;
    }
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseMediaQueryExpression(nsMediaQuery* aQuery)
{
  if (!ExpectSymbol('(', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEMQExpectedExpressionStart);
    return PR_FALSE;
  }
  if (! GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEMQExpressionEOF);
    return PR_FALSE;
  }
  if (eCSSToken_Ident != mToken.mType) {
    REPORT_UNEXPECTED_TOKEN(PEMQExpectedFeatureName);
    UngetToken();
    SkipUntil(')');
    return PR_FALSE;
  }

  nsMediaExpression *expr = aQuery->NewExpression();
  if (!expr) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    SkipUntil(')');
    return PR_FALSE;
  }

  // case insensitive from CSS - must be lower cased
  nsContentUtils::ASCIIToLower(mToken.mIdent);
  const PRUnichar *featureString;
  if (StringBeginsWith(mToken.mIdent, NS_LITERAL_STRING("min-"))) {
    expr->mRange = nsMediaExpression::eMin;
    featureString = mToken.mIdent.get() + 4;
  } else if (StringBeginsWith(mToken.mIdent, NS_LITERAL_STRING("max-"))) {
    expr->mRange = nsMediaExpression::eMax;
    featureString = mToken.mIdent.get() + 4;
  } else {
    expr->mRange = nsMediaExpression::eEqual;
    featureString = mToken.mIdent.get();
  }

  nsCOMPtr<nsIAtom> mediaFeatureAtom = do_GetAtom(featureString);
  const nsMediaFeature *feature = nsMediaFeatures::features;
  for (; feature->mName; ++feature) {
    if (*(feature->mName) == mediaFeatureAtom) {
      break;
    }
  }
  if (!feature->mName ||
      (expr->mRange != nsMediaExpression::eEqual &&
       feature->mRangeType != nsMediaFeature::eMinMaxAllowed)) {
    REPORT_UNEXPECTED_TOKEN(PEMQExpectedFeatureName);
    SkipUntil(')');
    return PR_FALSE;
  }
  expr->mFeature = feature;

  if (!GetToken(PR_TRUE) || mToken.IsSymbol(')')) {
    // Query expressions for any feature can be given without a value.
    // However, min/max prefixes are not allowed.
    if (expr->mRange != nsMediaExpression::eEqual) {
      REPORT_UNEXPECTED(PEMQNoMinMaxWithoutValue);
      return PR_FALSE;
    }
    expr->mValue.Reset();
    return PR_TRUE;
  }

  if (!mToken.IsSymbol(':')) {
    REPORT_UNEXPECTED_TOKEN(PEMQExpectedFeatureNameEnd);
    UngetToken();
    SkipUntil(')');
    return PR_FALSE;
  }

  PRBool rv;
  switch (feature->mValueType) {
    case nsMediaFeature::eLength:
      rv = ParseNonNegativeVariant(expr->mValue, VARIANT_LENGTH, nsnull);
      break;
    case nsMediaFeature::eInteger:
    case nsMediaFeature::eBoolInteger:
      rv = ParseNonNegativeVariant(expr->mValue, VARIANT_INTEGER, nsnull);
      // Enforce extra restrictions for eBoolInteger
      if (rv &&
          feature->mValueType == nsMediaFeature::eBoolInteger &&
          expr->mValue.GetIntValue() > 1)
        rv = PR_FALSE;
      break;
    case nsMediaFeature::eFloat:
      rv = ParseNonNegativeVariant(expr->mValue, VARIANT_NUMBER, nsnull);
      break;
    case nsMediaFeature::eIntRatio:
      {
        // Two integers separated by '/', with optional whitespace on
        // either side of the '/'.
        nsRefPtr<nsCSSValue::Array> a = nsCSSValue::Array::Create(2);
        expr->mValue.SetArrayValue(a, eCSSUnit_Array);
        // We don't bother with ParseNonNegativeVariant since we have to
        // check for != 0 as well; no need to worry about the UngetToken
        // since we're throwing out up to the next ')' anyway.
        rv = ParseVariant(a->Item(0), VARIANT_INTEGER, nsnull) &&
             a->Item(0).GetIntValue() > 0 &&
             ExpectSymbol('/', PR_TRUE) &&
             ParseVariant(a->Item(1), VARIANT_INTEGER, nsnull) &&
             a->Item(1).GetIntValue() > 0;
      }
      break;
    case nsMediaFeature::eResolution:
      rv = GetToken(PR_TRUE);
      if (!rv)
        break;
      rv = mToken.mType == eCSSToken_Dimension &&
           mToken.mIntegerValid && mToken.mNumber > 0.0f;
      if (!rv) {
        UngetToken();
        break;
      }
      // No worries about whether unitless zero is allowed, since the
      // value must be positive (and we checked that above).
      NS_ASSERTION(!mToken.mIdent.IsEmpty(), "unit lied");
      if (mToken.mIdent.LowerCaseEqualsLiteral("dpi")) {
        expr->mValue.SetFloatValue(mToken.mNumber, eCSSUnit_Inch);
      } else if (mToken.mIdent.LowerCaseEqualsLiteral("dpcm")) {
        expr->mValue.SetFloatValue(mToken.mNumber, eCSSUnit_Centimeter);
      } else {
        rv = PR_FALSE;
      }
      break;
    case nsMediaFeature::eEnumerated:
      rv = ParseVariant(expr->mValue, VARIANT_KEYWORD,
                        feature->mData.mKeywordTable);
      break;
    case nsMediaFeature::eIdent:
      rv = ParseVariant(expr->mValue, VARIANT_IDENTIFIER, nsnull);
      break;
  }
  if (!rv || !ExpectSymbol(')', PR_TRUE)) {
    REPORT_UNEXPECTED(PEMQExpectedFeatureValue);
    SkipUntil(')');
    return PR_FALSE;
  }

  return PR_TRUE;
}

// Parse a CSS2 import rule: "@import STRING | URL [medium [, medium]]"
PRBool
CSSParserImpl::ParseImportRule(RuleAppendFunc aAppendFunc, void* aData)
{
  nsRefPtr<nsMediaList> media = new nsMediaList();
  if (!media) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  nsAutoString url;
  if (!GatherURL(url)) {
    REPORT_UNEXPECTED_TOKEN(PEImportNotURI);
    return PR_FALSE;
  }

  if (!ExpectSymbol(';', PR_TRUE)) {
    if (!GatherMedia(media, ';') ||
        !ExpectSymbol(';', PR_TRUE)) {
      REPORT_UNEXPECTED_TOKEN(PEImportUnexpected);
      // don't advance section, simply ignore invalid @import
      return PR_FALSE;
    }

    // Safe to assert this, since we ensured that there is something
    // other than the ';' coming after the @import's url() token.
    NS_ASSERTION(media->Count() != 0, "media list must be nonempty");
  }

  ProcessImport(url, media, aAppendFunc, aData);
  return PR_TRUE;
}


void
CSSParserImpl::ProcessImport(const nsString& aURLSpec,
                             nsMediaList* aMedia,
                             RuleAppendFunc aAppendFunc,
                             void* aData)
{
  nsCOMPtr<nsICSSImportRule> rule;
  nsresult rv = NS_NewCSSImportRule(getter_AddRefs(rule), aURLSpec, aMedia);
  if (NS_FAILED(rv)) { // out of memory
    mScanner.SetLowLevelError(rv);
    return;
  }
  (*aAppendFunc)(rule, aData);

  // Diagnose bad URIs even if we don't have a child loader.
  nsCOMPtr<nsIURI> url;
  // Charset will be deduced from mBaseURI, which is more or less correct.
  rv = NS_NewURI(getter_AddRefs(url), aURLSpec, nsnull, mBaseURI);

  if (NS_FAILED(rv)) {
    if (rv == NS_ERROR_MALFORMED_URI) {
      // import url is bad
      const PRUnichar *params[] = {
        aURLSpec.get()
      };
      REPORT_UNEXPECTED_P(PEImportBadURI, params);
      OUTPUT_ERROR();
    }
    return;
  }

  if (mChildLoader) {
    mChildLoader->LoadChildSheet(mSheet, url, aMedia, rule);
  }
}

// Parse the {} part of an @media or @-moz-document rule.
PRBool
CSSParserImpl::ParseGroupRule(nsICSSGroupRule* aRule,
                              RuleAppendFunc aAppendFunc,
                              void* aData)
{
  // XXXbz this could use better error reporting throughout the method
  if (!ExpectSymbol('{', PR_TRUE)) {
    return PR_FALSE;
  }

  // push rule on stack, loop over children
  if (!PushGroup(aRule)) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }
  nsCSSSection holdSection = mSection;
  mSection = eCSSSection_General;

  for (;;) {
    // Get next non-whitespace token
    if (! GetToken(PR_TRUE)) {
      REPORT_UNEXPECTED_EOF(PEGroupRuleEOF);
      break;
    }
    if (mToken.IsSymbol('}')) { // done!
      UngetToken();
      break;
    }
    if (eCSSToken_AtKeyword == mToken.mType) {
      SkipAtRule(); // group rules cannot contain @rules
      continue;
    }
    UngetToken();
    ParseRuleSet(AppendRuleToSheet, this, PR_TRUE);
  }
  PopGroup();

  if (!ExpectSymbol('}', PR_TRUE)) {
    mSection = holdSection;
    return PR_FALSE;
  }
  (*aAppendFunc)(aRule, aData);
  return PR_TRUE;
}

// Parse a CSS2 media rule: "@media medium [, medium] { ... }"
PRBool
CSSParserImpl::ParseMediaRule(RuleAppendFunc aAppendFunc, void* aData)
{
  nsRefPtr<nsMediaList> media = new nsMediaList();
  if (!media) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  if (GatherMedia(media, '{')) {
    // XXXbz this could use better error reporting throughout the method
    nsRefPtr<nsCSSMediaRule> rule(new nsCSSMediaRule());
    // Append first, so when we do SetMedia() the rule
    // knows what its stylesheet is.
    if (rule && ParseGroupRule(rule, aAppendFunc, aData)) {
      rule->SetMedia(media);
      return PR_TRUE;
    }
  }

  return PR_FALSE;
}

// Parse a @-moz-document rule.  This is like an @media rule, but instead
// of a medium it has a nonempty list of items where each item is either
// url(), url-prefix(), or domain().
PRBool
CSSParserImpl::ParseMozDocumentRule(RuleAppendFunc aAppendFunc, void* aData)
{
  nsCSSDocumentRule::URL *urls = nsnull;
  nsCSSDocumentRule::URL **next = &urls;
  do {
    if (!GetToken(PR_TRUE) ||
        eCSSToken_Function != mToken.mType ||
        !(mToken.mIdent.LowerCaseEqualsLiteral("url") ||
          mToken.mIdent.LowerCaseEqualsLiteral("url-prefix") ||
          mToken.mIdent.LowerCaseEqualsLiteral("domain"))) {
      REPORT_UNEXPECTED_TOKEN(PEMozDocRuleBadFunc);
      delete urls;
      return PR_FALSE;
    }
    nsCSSDocumentRule::URL *cur = *next = new nsCSSDocumentRule::URL;
    if (!cur) {
      mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
      delete urls;
      return PR_FALSE;
    }
    next = &cur->next;
    if (mToken.mIdent.LowerCaseEqualsLiteral("url")) {
      cur->func = nsCSSDocumentRule::eURL;
    } else if (mToken.mIdent.LowerCaseEqualsLiteral("url-prefix")) {
      cur->func = nsCSSDocumentRule::eURLPrefix;
    } else if (mToken.mIdent.LowerCaseEqualsLiteral("domain")) {
      cur->func = nsCSSDocumentRule::eDomain;
    }

    nsAutoString url;
    if (!GetURLInParens(url)) {
      REPORT_UNEXPECTED_TOKEN(PEMozDocRuleNotURI);
      delete urls;
      return PR_FALSE;
    }

    // We could try to make the URL (as long as it's not domain())
    // canonical and absolute with NS_NewURI and GetSpec, but I'm
    // inclined to think we shouldn't.
    CopyUTF16toUTF8(url, cur->url);
  } while (ExpectSymbol(',', PR_TRUE));

  nsRefPtr<nsCSSDocumentRule> rule(new nsCSSDocumentRule());
  if (!rule) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    delete urls;
    return PR_FALSE;
  }
  rule->SetURLs(urls);

  return ParseGroupRule(rule, aAppendFunc, aData);
}

// Parse a CSS3 namespace rule: "@namespace [prefix] STRING | URL;"
PRBool
CSSParserImpl::ParseNameSpaceRule(RuleAppendFunc aAppendFunc, void* aData)
{
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEAtNSPrefixEOF);
    return PR_FALSE;
  }

  nsAutoString  prefix;
  nsAutoString  url;

  if (eCSSToken_Ident == mToken.mType) {
    prefix = mToken.mIdent;
    // user-specified identifiers are case-sensitive (bug 416106)
    if (! GetToken(PR_TRUE)) {
      REPORT_UNEXPECTED_EOF(PEAtNSURIEOF);
      return PR_FALSE;
    }
  }

  if (eCSSToken_String == mToken.mType) {
    url = mToken.mIdent;
    if (ExpectSymbol(';', PR_TRUE)) {
      ProcessNameSpace(prefix, url, aAppendFunc, aData);
      return PR_TRUE;
    }
  }
  else if ((eCSSToken_Function == mToken.mType) &&
           (mToken.mIdent.LowerCaseEqualsLiteral("url"))) {
    if (GetURLInParens(url) &&
        ExpectSymbol(';', PR_TRUE)) {
      ProcessNameSpace(prefix, url, aAppendFunc, aData);
      return PR_TRUE;
    }
  }
  else {
    UngetToken();
  }
  REPORT_UNEXPECTED_TOKEN(PEAtNSUnexpected);

  return PR_FALSE;
}

void
CSSParserImpl::ProcessNameSpace(const nsString& aPrefix,
                                const nsString& aURLSpec,
                                RuleAppendFunc aAppendFunc,
                                void* aData)
{
  nsCOMPtr<nsICSSNameSpaceRule> rule;
  nsCOMPtr<nsIAtom> prefix;

  if (!aPrefix.IsEmpty()) {
    prefix = do_GetAtom(aPrefix);
  }

  NS_NewCSSNameSpaceRule(getter_AddRefs(rule), prefix, aURLSpec);
  if (rule) {
    (*aAppendFunc)(rule, aData);

    // If this was the first namespace rule encountered, it will trigger
    // creation of a namespace map.
    if (!mNameSpaceMap) {
      mNameSpaceMap = mSheet->GetNameSpaceMap();
    }
  }
}

// font-face-rule: '@font-face' '{' font-description '}'
// font-description: font-descriptor+
PRBool
CSSParserImpl::ParseFontFaceRule(RuleAppendFunc aAppendFunc, void* aData)
{
  if (!ExpectSymbol('{', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEBadFontBlockStart);
    return PR_FALSE;
  }

  nsRefPtr<nsCSSFontFaceRule> rule(new nsCSSFontFaceRule());
  if (!rule) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  for (;;) {
    if (!GetToken(PR_TRUE)) {
      REPORT_UNEXPECTED_EOF(PEFontFaceEOF);
      break;
    }
    if (mToken.IsSymbol('}')) { // done!
      UngetToken();
      break;
    }

    // ignore extra semicolons
    if (mToken.IsSymbol(';'))
      continue;

    if (!ParseFontDescriptor(rule)) {
      REPORT_UNEXPECTED(PEDeclSkipped);
      OUTPUT_ERROR();
      if (!SkipDeclaration(PR_TRUE))
        break;
    }
  }
  if (!ExpectSymbol('}', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEBadFontBlockEnd);
    return PR_FALSE;
  }
  (*aAppendFunc)(rule, aData);
  return PR_TRUE;
}

// font-descriptor: font-family-desc
//                | font-style-desc
//                | font-weight-desc
//                | font-stretch-desc
//                | font-src-desc
//                | unicode-range-desc
//
// All font-*-desc productions follow the pattern
//    IDENT ':' value ';'
//
// On entry to this function, mToken is the IDENT.

PRBool
CSSParserImpl::ParseFontDescriptor(nsCSSFontFaceRule* aRule)
{
  if (eCSSToken_Ident != mToken.mType) {
    REPORT_UNEXPECTED_TOKEN(PEFontDescExpected);
    return PR_FALSE;
  }

  nsString descName = mToken.mIdent;
  if (!ExpectSymbol(':', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEParseDeclarationNoColon);
    OUTPUT_ERROR();
    return PR_FALSE;
  }

  nsCSSFontDesc descID = nsCSSProps::LookupFontDesc(descName);
  nsCSSValue value;

  if (descID == eCSSFontDesc_UNKNOWN) {
    if (NonMozillaVendorIdentifier(descName)) {
      // silently skip other vendors' extensions
      SkipDeclaration(PR_TRUE);
      return PR_TRUE;
    } else {
      const PRUnichar *params[] = {
        descName.get()
      };
      REPORT_UNEXPECTED_P(PEUnknownFontDesc, params);
      return PR_FALSE;
    }
  }

  if (!ParseFontDescriptorValue(descID, value)) {
    const PRUnichar *params[] = {
      descName.get()
    };
    REPORT_UNEXPECTED_P(PEValueParsingError, params);
    return PR_FALSE;
  }

  if (!ExpectEndProperty())
    return PR_FALSE;

  aRule->SetDesc(descID, value);
  return PR_TRUE;
}


PRBool
CSSParserImpl::ParsePageRule(RuleAppendFunc aAppendFunc, void* aData)
{
  // XXX not yet implemented
  return PR_FALSE;
}

void
CSSParserImpl::SkipUntil(PRUnichar aStopSymbol)
{
  nsCSSToken* tk = &mToken;
  nsAutoTArray<PRUnichar, 16> stack;
  stack.AppendElement(aStopSymbol);
  for (;;) {
    if (!GetToken(PR_TRUE)) {
      break;
    }
    if (eCSSToken_Symbol == tk->mType) {
      PRUnichar symbol = tk->mSymbol;
      PRUint32 stackTopIndex = stack.Length() - 1;
      if (symbol == stack.ElementAt(stackTopIndex)) {
        stack.RemoveElementAt(stackTopIndex);
        if (stackTopIndex == 0) {
          break;
        }

      // Just handle out-of-memory by parsing incorrectly.  It's
      // highly unlikely we're dealing with a legitimate style sheet
      // anyway.
      } else if ('{' == symbol) {
        stack.AppendElement('}');
      } else if ('[' == symbol) {
        stack.AppendElement(']');
      } else if ('(' == symbol) {
        stack.AppendElement(')');
      }
    } else if (eCSSToken_Function == tk->mType) {
      stack.AppendElement(')');
    }
  }
}

void
CSSParserImpl::SkipUntilOneOf(const PRUnichar* aStopSymbolChars)
{
  nsCSSToken* tk = &mToken;
  nsDependentString stopSymbolChars(aStopSymbolChars);
  for (;;) {
    if (!GetToken(PR_TRUE)) {
      break;
    }
    if (eCSSToken_Symbol == tk->mType) {
      PRUnichar symbol = tk->mSymbol;
      if (stopSymbolChars.FindChar(symbol) != -1) {
        break;
      } else if ('{' == symbol) {
        SkipUntil('}');
      } else if ('[' == symbol) {
        SkipUntil(']');
      } else if ('(' == symbol) {
        SkipUntil(')');
      }
    } else if (eCSSToken_Function == tk->mType) {
      SkipUntil(')');
    }
  }
}

PRBool
CSSParserImpl::SkipDeclaration(PRBool aCheckForBraces)
{
  nsCSSToken* tk = &mToken;
  for (;;) {
    if (!GetToken(PR_TRUE)) {
      if (aCheckForBraces) {
        REPORT_UNEXPECTED_EOF(PESkipDeclBraceEOF);
      }
      return PR_FALSE;
    }
    if (eCSSToken_Symbol == tk->mType) {
      PRUnichar symbol = tk->mSymbol;
      if (';' == symbol) {
        break;
      }
      if (aCheckForBraces) {
        if ('}' == symbol) {
          UngetToken();
          break;
        }
      }
      if ('{' == symbol) {
        SkipUntil('}');
      } else if ('(' == symbol) {
        SkipUntil(')');
      } else if ('[' == symbol) {
        SkipUntil(']');
      }
    } else if (eCSSToken_Function == tk->mType) {
      SkipUntil(')');
    }
  }
  return PR_TRUE;
}

void
CSSParserImpl::SkipRuleSet(PRBool aInsideBraces)
{
  nsCSSToken* tk = &mToken;
  for (;;) {
    if (!GetToken(PR_TRUE)) {
      REPORT_UNEXPECTED_EOF(PESkipRSBraceEOF);
      break;
    }
    if (eCSSToken_Symbol == tk->mType) {
      PRUnichar symbol = tk->mSymbol;
      if ('}' == symbol && aInsideBraces) {
        // leave block closer for higher-level grammar to consume
        UngetToken();
        break;
      } else if ('{' == symbol) {
        SkipUntil('}');
        break;
      } else if ('(' == symbol) {
        SkipUntil(')');
      } else if ('[' == symbol) {
        SkipUntil(']');
      }
    } else if (eCSSToken_Function == tk->mType) {
      SkipUntil(')');
    }
  } 
}

PRBool
CSSParserImpl::PushGroup(nsICSSGroupRule* aRule)
{
  if (mGroupStack.AppendObject(aRule))
    return PR_TRUE;

  return PR_FALSE;
}

void
CSSParserImpl::PopGroup(void)
{
  PRInt32 count = mGroupStack.Count();
  if (0 < count) {
    mGroupStack.RemoveObjectAt(count - 1);
  }
}

void
CSSParserImpl::AppendRule(nsICSSRule* aRule)
{
  PRInt32 count = mGroupStack.Count();
  if (0 < count) {
    mGroupStack[count - 1]->AppendStyleRule(aRule);
  }
  else {
    mSheet->AppendStyleRule(aRule);
  }
}

PRBool
CSSParserImpl::ParseRuleSet(RuleAppendFunc aAppendFunc, void* aData,
                            PRBool aInsideBraces)
{
  // First get the list of selectors for the rule
  nsCSSSelectorList* slist = nsnull;
  PRUint32 linenum = mScanner.GetLineNumber();
  if (! ParseSelectorList(slist, PRUnichar('{'))) {
    REPORT_UNEXPECTED(PEBadSelectorRSIgnored);
    OUTPUT_ERROR();
    SkipRuleSet(aInsideBraces);
    return PR_FALSE;
  }
  NS_ASSERTION(nsnull != slist, "null selector list");
  CLEAR_ERROR();

  // Next parse the declaration block
  css::Declaration* declaration = ParseDeclarationBlock(PR_TRUE);
  if (nsnull == declaration) {
    // XXX skip something here
    delete slist;
    return PR_FALSE;
  }

#if 0
  slist->Dump();
  fputs("{\n", stdout);
  declaration->List();
  fputs("}\n", stdout);
#endif

  // Translate the selector list and declaration block into style data

  nsCOMPtr<nsICSSStyleRule> rule = NS_NewCSSStyleRule(slist, declaration);
  rule->SetLineNumber(linenum);
  (*aAppendFunc)(rule, aData);

  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseSelectorList(nsCSSSelectorList*& aListHead,
                                 PRUnichar aStopChar)
{
  nsCSSSelectorList* list = nsnull;
  if (! ParseSelectorGroup(list)) {
    // must have at least one selector group
    aListHead = nsnull;
    return PR_FALSE;
  }
  NS_ASSERTION(nsnull != list, "no selector list");
  aListHead = list;

  // After that there must either be a "," or a "{" (the latter if
  // StopChar is nonzero)
  nsCSSToken* tk = &mToken;
  for (;;) {
    if (! GetToken(PR_TRUE)) {
      if (aStopChar == PRUnichar(0)) {
        return PR_TRUE;
      }

      REPORT_UNEXPECTED_EOF(PESelectorListExtraEOF);
      break;
    }

    if (eCSSToken_Symbol == tk->mType) {
      if (',' == tk->mSymbol) {
        nsCSSSelectorList* newList = nsnull;
        // Another selector group must follow
        if (! ParseSelectorGroup(newList)) {
          break;
        }
        // add new list to the end of the selector list
        list->mNext = newList;
        list = newList;
        continue;
      } else if (aStopChar == tk->mSymbol && aStopChar != PRUnichar(0)) {
        UngetToken();
        return PR_TRUE;
      }
    }
    REPORT_UNEXPECTED_TOKEN(PESelectorListExtra);
    UngetToken();
    break;
  }

  delete aListHead;
  aListHead = nsnull;
  return PR_FALSE;
}

static PRBool IsUniversalSelector(const nsCSSSelector& aSelector)
{
  return PRBool((aSelector.mNameSpace == kNameSpaceID_Unknown) &&
                (aSelector.mLowercaseTag == nsnull) &&
                (aSelector.mIDList == nsnull) &&
                (aSelector.mClassList == nsnull) &&
                (aSelector.mAttrList == nsnull) &&
                (aSelector.mNegations == nsnull) &&
                (aSelector.mPseudoClassList == nsnull));
}

PRBool
CSSParserImpl::ParseSelectorGroup(nsCSSSelectorList*& aList)
{
  PRUnichar combinator = 0;
  nsAutoPtr<nsCSSSelectorList> list(new nsCSSSelectorList());

  for (;;) {
    if (!ParseSelector(list, combinator)) {
      return PR_FALSE;
    }

    // Look for a combinator.
    if (!GetToken(PR_FALSE)) {
      break; // EOF ok here
    }

    combinator = PRUnichar(0);
    if (mToken.mType == eCSSToken_WhiteSpace) {
      if (!GetToken(PR_TRUE)) {
        break; // EOF ok here
      }
      combinator = PRUnichar(' ');
    }

    if (mToken.mType != eCSSToken_Symbol) {
      UngetToken(); // not a combinator
    } else {
      PRUnichar symbol = mToken.mSymbol;
      if (symbol == '+' || symbol == '>' || symbol == '~') {
        combinator = mToken.mSymbol;
      } else {
        UngetToken(); // not a combinator
        if (symbol == ',' || symbol == '{' || symbol == ')') {
          break; // end of selector group
        }
      }
    }

    if (!combinator) {
      REPORT_UNEXPECTED_TOKEN(PESelectorListExtra);
      return PR_FALSE;
    }
  }

  aList = list.forget();
  return PR_TRUE;
}

#define SEL_MASK_NSPACE   0x01
#define SEL_MASK_ELEM     0x02
#define SEL_MASK_ID       0x04
#define SEL_MASK_CLASS    0x08
#define SEL_MASK_ATTRIB   0x10
#define SEL_MASK_PCLASS   0x20
#define SEL_MASK_PELEM    0x40

//
// Parses an ID selector #name
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParseIDSelector(PRInt32&       aDataMask,
                               nsCSSSelector& aSelector)
{
  NS_ASSERTION(!mToken.mIdent.IsEmpty(),
               "Empty mIdent in eCSSToken_ID token?");
  aDataMask |= SEL_MASK_ID;
  aSelector.AddID(mToken.mIdent);
  return eSelectorParsingStatus_Continue;
}

//
// Parses a class selector .name
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParseClassSelector(PRInt32&       aDataMask,
                                  nsCSSSelector& aSelector)
{
  if (! GetToken(PR_FALSE)) { // get ident
    REPORT_UNEXPECTED_EOF(PEClassSelEOF);
    return eSelectorParsingStatus_Error;
  }
  if (eCSSToken_Ident != mToken.mType) {  // malformed selector
    REPORT_UNEXPECTED_TOKEN(PEClassSelNotIdent);
    UngetToken();
    return eSelectorParsingStatus_Error;
  }
  aDataMask |= SEL_MASK_CLASS;

  aSelector.AddClass(mToken.mIdent);

  return eSelectorParsingStatus_Continue;
}

//
// Parse a type element selector or a universal selector
// namespace|type or namespace|* or *|* or *
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParseTypeOrUniversalSelector(PRInt32&       aDataMask,
                                            nsCSSSelector& aSelector,
                                            PRBool         aIsNegated)
{
  nsAutoString buffer;
  if (mToken.IsSymbol('*')) {  // universal element selector, or universal namespace
    if (ExpectSymbol('|', PR_FALSE)) {  // was namespace
      aDataMask |= SEL_MASK_NSPACE;
      aSelector.SetNameSpace(kNameSpaceID_Unknown); // namespace wildcard

      if (! GetToken(PR_FALSE)) {
        REPORT_UNEXPECTED_EOF(PETypeSelEOF);
        return eSelectorParsingStatus_Error;
      }
      if (eCSSToken_Ident == mToken.mType) {  // element name
        aDataMask |= SEL_MASK_ELEM;

        aSelector.SetTag(mToken.mIdent);
      }
      else if (mToken.IsSymbol('*')) {  // universal selector
        aDataMask |= SEL_MASK_ELEM;
        // don't set tag
      }
      else {
        REPORT_UNEXPECTED_TOKEN(PETypeSelNotType);
        UngetToken();
        return eSelectorParsingStatus_Error;
      }
    }
    else {  // was universal element selector
      SetDefaultNamespaceOnSelector(aSelector);
      aDataMask |= SEL_MASK_ELEM;
      // don't set any tag in the selector
    }
    if (! GetToken(PR_FALSE)) {   // premature eof is ok (here!)
      return eSelectorParsingStatus_Done;
    }
  }
  else if (eCSSToken_Ident == mToken.mType) {    // element name or namespace name
    buffer = mToken.mIdent; // hang on to ident

    if (ExpectSymbol('|', PR_FALSE)) {  // was namespace
      aDataMask |= SEL_MASK_NSPACE;
      PRInt32 nameSpaceID = GetNamespaceIdForPrefix(buffer);
      if (nameSpaceID == kNameSpaceID_Unknown) {
        return eSelectorParsingStatus_Error;
      }
      aSelector.SetNameSpace(nameSpaceID);

      if (! GetToken(PR_FALSE)) {
        REPORT_UNEXPECTED_EOF(PETypeSelEOF);
        return eSelectorParsingStatus_Error;
      }
      if (eCSSToken_Ident == mToken.mType) {  // element name
        aDataMask |= SEL_MASK_ELEM;
        aSelector.SetTag(mToken.mIdent);
      }
      else if (mToken.IsSymbol('*')) {  // universal selector
        aDataMask |= SEL_MASK_ELEM;
        // don't set tag
      }
      else {
        REPORT_UNEXPECTED_TOKEN(PETypeSelNotType);
        UngetToken();
        return eSelectorParsingStatus_Error;
      }
    }
    else {  // was element name
      SetDefaultNamespaceOnSelector(aSelector);
      aSelector.SetTag(buffer);

      aDataMask |= SEL_MASK_ELEM;
    }
    if (! GetToken(PR_FALSE)) {   // premature eof is ok (here!)
      return eSelectorParsingStatus_Done;
    }
  }
  else if (mToken.IsSymbol('|')) {  // No namespace
    aDataMask |= SEL_MASK_NSPACE;
    aSelector.SetNameSpace(kNameSpaceID_None);  // explicit NO namespace

    // get mandatory tag
    if (! GetToken(PR_FALSE)) {
      REPORT_UNEXPECTED_EOF(PETypeSelEOF);
      return eSelectorParsingStatus_Error;
    }
    if (eCSSToken_Ident == mToken.mType) {  // element name
      aDataMask |= SEL_MASK_ELEM;
      aSelector.SetTag(mToken.mIdent);
    }
    else if (mToken.IsSymbol('*')) {  // universal selector
      aDataMask |= SEL_MASK_ELEM;
      // don't set tag
    }
    else {
      REPORT_UNEXPECTED_TOKEN(PETypeSelNotType);
      UngetToken();
      return eSelectorParsingStatus_Error;
    }
    if (! GetToken(PR_FALSE)) {   // premature eof is ok (here!)
      return eSelectorParsingStatus_Done;
    }
  }
  else {
    SetDefaultNamespaceOnSelector(aSelector);
  }

  if (aIsNegated) {
    // restore last token read in case of a negated type selector
    UngetToken();
  }
  return eSelectorParsingStatus_Continue;
}

//
// Parse attribute selectors [attr], [attr=value], [attr|=value],
// [attr~=value], [attr^=value], [attr$=value] and [attr*=value]
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParseAttributeSelector(PRInt32&       aDataMask,
                                      nsCSSSelector& aSelector)
{
  if (! GetToken(PR_TRUE)) { // premature EOF
    REPORT_UNEXPECTED_EOF(PEAttributeNameEOF);
    return eSelectorParsingStatus_Error;
  }

  PRInt32 nameSpaceID = kNameSpaceID_None;
  nsAutoString  attr;
  if (mToken.IsSymbol('*')) { // wildcard namespace
    nameSpaceID = kNameSpaceID_Unknown;
    if (ExpectSymbol('|', PR_FALSE)) {
      if (! GetToken(PR_FALSE)) { // premature EOF
        REPORT_UNEXPECTED_EOF(PEAttributeNameEOF);
        return eSelectorParsingStatus_Error;
      }
      if (eCSSToken_Ident == mToken.mType) { // attr name
        attr = mToken.mIdent;
      }
      else {
        REPORT_UNEXPECTED_TOKEN(PEAttributeNameExpected);
        UngetToken();
        return eSelectorParsingStatus_Error;
       }
    }
    else {
      REPORT_UNEXPECTED_TOKEN(PEAttSelNoBar);
      return eSelectorParsingStatus_Error;
    }
  }
  else if (mToken.IsSymbol('|')) { // NO namespace
    if (! GetToken(PR_FALSE)) { // premature EOF
      REPORT_UNEXPECTED_EOF(PEAttributeNameEOF);
      return eSelectorParsingStatus_Error;
    }
    if (eCSSToken_Ident == mToken.mType) { // attr name
      attr = mToken.mIdent;
    }
    else {
      REPORT_UNEXPECTED_TOKEN(PEAttributeNameExpected);
      UngetToken();
      return eSelectorParsingStatus_Error;
    }
  }
  else if (eCSSToken_Ident == mToken.mType) { // attr name or namespace
    attr = mToken.mIdent; // hang on to it
    if (ExpectSymbol('|', PR_FALSE)) {  // was a namespace
      nameSpaceID = GetNamespaceIdForPrefix(attr);
      if (nameSpaceID == kNameSpaceID_Unknown) {
        return eSelectorParsingStatus_Error;
      }
      if (! GetToken(PR_FALSE)) { // premature EOF
        REPORT_UNEXPECTED_EOF(PEAttributeNameEOF);
        return eSelectorParsingStatus_Error;
      }
      if (eCSSToken_Ident == mToken.mType) { // attr name
        attr = mToken.mIdent;
      }
      else {
        REPORT_UNEXPECTED_TOKEN(PEAttributeNameExpected);
        UngetToken();
        return eSelectorParsingStatus_Error;
      }
    }
  }
  else {  // malformed
    REPORT_UNEXPECTED_TOKEN(PEAttributeNameOrNamespaceExpected);
    UngetToken();
    return eSelectorParsingStatus_Error;
  }

  if (! GetToken(PR_TRUE)) { // premature EOF
    REPORT_UNEXPECTED_EOF(PEAttSelInnerEOF);
    return eSelectorParsingStatus_Error;
  }
  if ((eCSSToken_Symbol == mToken.mType) ||
      (eCSSToken_Includes == mToken.mType) ||
      (eCSSToken_Dashmatch == mToken.mType) ||
      (eCSSToken_Beginsmatch == mToken.mType) ||
      (eCSSToken_Endsmatch == mToken.mType) ||
      (eCSSToken_Containsmatch == mToken.mType)) {
    PRUint8 func;
    if (eCSSToken_Includes == mToken.mType) {
      func = NS_ATTR_FUNC_INCLUDES;
    }
    else if (eCSSToken_Dashmatch == mToken.mType) {
      func = NS_ATTR_FUNC_DASHMATCH;
    }
    else if (eCSSToken_Beginsmatch == mToken.mType) {
      func = NS_ATTR_FUNC_BEGINSMATCH;
    }
    else if (eCSSToken_Endsmatch == mToken.mType) {
      func = NS_ATTR_FUNC_ENDSMATCH;
    }
    else if (eCSSToken_Containsmatch == mToken.mType) {
      func = NS_ATTR_FUNC_CONTAINSMATCH;
    }
    else if (']' == mToken.mSymbol) {
      aDataMask |= SEL_MASK_ATTRIB;
      aSelector.AddAttribute(nameSpaceID, attr);
      func = NS_ATTR_FUNC_SET;
    }
    else if ('=' == mToken.mSymbol) {
      func = NS_ATTR_FUNC_EQUALS;
    }
    else {
      REPORT_UNEXPECTED_TOKEN(PEAttSelUnexpected);
      UngetToken(); // bad function
      return eSelectorParsingStatus_Error;
    }
    if (NS_ATTR_FUNC_SET != func) { // get value
      if (! GetToken(PR_TRUE)) { // premature EOF
        REPORT_UNEXPECTED_EOF(PEAttSelValueEOF);
        return eSelectorParsingStatus_Error;
      }
      if ((eCSSToken_Ident == mToken.mType) || (eCSSToken_String == mToken.mType)) {
        nsAutoString  value(mToken.mIdent);
        if (! GetToken(PR_TRUE)) { // premature EOF
          REPORT_UNEXPECTED_EOF(PEAttSelCloseEOF);
          return eSelectorParsingStatus_Error;
        }
        if (mToken.IsSymbol(']')) {
          PRBool isCaseSensitive = PR_TRUE;

          // For cases when this style sheet is applied to an HTML
          // element in an HTML document, and the attribute selector is
          // for a non-namespaced attribute, then check to see if it's
          // one of the known attributes whose VALUE is
          // case-insensitive.
          if (nameSpaceID == kNameSpaceID_None) {
            static const char* caseInsensitiveHTMLAttribute[] = {
              // list based on http://www.w3.org/TR/html4/
              "lang",
              "dir",
              "http-equiv",
              "text",
              "link",
              "vlink",
              "alink",
              "compact",
              "align",
              "frame",
              "rules",
              "valign",
              "scope",
              "axis",
              "nowrap",
              "hreflang",
              "rel",
              "rev",
              "charset",
              "codetype",
              "declare",
              "valuetype",
              "shape",
              "nohref",
              "media",
              "bgcolor",
              "clear",
              "color",
              "face",
              "noshade",
              "noresize",
              "scrolling",
              "target",
              "method",
              "enctype",
              "accept-charset",
              "accept",
              "checked",
              "multiple",
              "selected",
              "disabled",
              "readonly",
              "language",
              "defer",
              "type",
              // additional attributes not in HTML4
              "direction", // marquee
              nsnull
            };
            short i = 0;
            const char* htmlAttr;
            while ((htmlAttr = caseInsensitiveHTMLAttribute[i++])) {
              if (attr.LowerCaseEqualsASCII(htmlAttr)) {
                isCaseSensitive = PR_FALSE;
                break;
              }
            }
          }
          aDataMask |= SEL_MASK_ATTRIB;
          aSelector.AddAttribute(nameSpaceID, attr, func, value, isCaseSensitive);
        }
        else {
          REPORT_UNEXPECTED_TOKEN(PEAttSelNoClose);
          UngetToken();
          return eSelectorParsingStatus_Error;
        }
      }
      else {
        REPORT_UNEXPECTED_TOKEN(PEAttSelBadValue);
        UngetToken();
        return eSelectorParsingStatus_Error;
      }
    }
  }
  else {
    REPORT_UNEXPECTED_TOKEN(PEAttSelUnexpected);
    UngetToken(); // bad dog, no biscut!
    return eSelectorParsingStatus_Error;
   }
   return eSelectorParsingStatus_Continue;
}

//
// Parse pseudo-classes and pseudo-elements
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParsePseudoSelector(PRInt32&       aDataMask,
                                   nsCSSSelector& aSelector,
                                   PRBool         aIsNegated,
                                   nsIAtom**      aPseudoElement,
                                   nsPseudoClassList** aPseudoElementArgs,
                                   nsCSSPseudoElements::Type* aPseudoElementType)
{
  NS_ASSERTION(aIsNegated || (aPseudoElement && aPseudoElementArgs),
               "expected location to store pseudo element");
  NS_ASSERTION(!aIsNegated || (!aPseudoElement && !aPseudoElementArgs),
               "negated selectors shouldn't have a place to store "
               "pseudo elements");
  if (! GetToken(PR_FALSE)) { // premature eof
    REPORT_UNEXPECTED_EOF(PEPseudoSelEOF);
    return eSelectorParsingStatus_Error;
  }

  // First, find out whether we are parsing a CSS3 pseudo-element
  PRBool parsingPseudoElement = PR_FALSE;
  if (mToken.IsSymbol(':')) {
    parsingPseudoElement = PR_TRUE;
    if (! GetToken(PR_FALSE)) { // premature eof
      REPORT_UNEXPECTED_EOF(PEPseudoSelEOF);
      return eSelectorParsingStatus_Error;
    }
  }

  // Do some sanity-checking on the token
  if (eCSSToken_Ident != mToken.mType && eCSSToken_Function != mToken.mType) {
    // malformed selector
    REPORT_UNEXPECTED_TOKEN(PEPseudoSelBadName);
    UngetToken();
    return eSelectorParsingStatus_Error;
  }

  // OK, now we know we have an mIdent.  Atomize it.  All the atoms, for
  // pseudo-classes as well as pseudo-elements, start with a single ':'.
  nsAutoString buffer;
  buffer.Append(PRUnichar(':'));
  buffer.Append(mToken.mIdent);
  nsContentUtils::ASCIIToLower(buffer);
  nsCOMPtr<nsIAtom> pseudo = do_GetAtom(buffer);
  if (!pseudo) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return eSelectorParsingStatus_Error;
  }

  // stash away some info about this pseudo so we only have to get it once.
  PRBool isTreePseudo = PR_FALSE;
  nsCSSPseudoElements::Type pseudoElementType =
    nsCSSPseudoElements::GetPseudoType(pseudo);
#ifdef MOZ_XUL
  isTreePseudo = (pseudoElementType == nsCSSPseudoElements::ePseudo_XULTree);
  // If a tree pseudo-element is using the function syntax, it will
  // get isTree set here and will pass the check below that only
  // allows functions if they are in our list of things allowed to be
  // functions.  If it is _not_ using the function syntax, isTree will
  // be false, and it will still pass that check.  So the tree
  // pseudo-elements are allowed to be either functions or not, as
  // desired.
  PRBool isTree = (eCSSToken_Function == mToken.mType) && isTreePseudo;
#endif
  PRBool isPseudoElement =
    (pseudoElementType < nsCSSPseudoElements::ePseudo_PseudoElementCount);
  // anonymous boxes are only allowed if they're the tree boxes or we have
  // enabled unsafe rules
  PRBool isAnonBox = isTreePseudo ||
    (pseudoElementType == nsCSSPseudoElements::ePseudo_AnonBox &&
     mUnsafeRulesEnabled);
  nsCSSPseudoClasses::Type pseudoClassType =
    nsCSSPseudoClasses::GetPseudoType(pseudo);
  PRBool isPseudoClass =
    (pseudoClassType != nsCSSPseudoClasses::ePseudoClass_NotPseudoClass);

  NS_ASSERTION(!isPseudoClass ||
               pseudoElementType == nsCSSPseudoElements::ePseudo_NotPseudoElement,
               "Why is this atom both a pseudo-class and a pseudo-element?");
  NS_ASSERTION(isPseudoClass + isPseudoElement + isAnonBox <= 1,
               "Shouldn't be more than one of these");

  if (!isPseudoClass && !isPseudoElement && !isAnonBox) {
    // Not a pseudo-class, not a pseudo-element.... forget it
    REPORT_UNEXPECTED_TOKEN(PEPseudoSelUnknown);
    UngetToken();
    return eSelectorParsingStatus_Error;
  }

  // If it's a function token, it better be on our "ok" list, and if the name
  // is that of a function pseudo it better be a function token
  if ((eCSSToken_Function == mToken.mType) !=
      (
#ifdef MOZ_XUL
       isTree ||
#endif
       nsCSSPseudoClasses::notPseudo == pseudo ||
       nsCSSPseudoClasses::HasStringArg(pseudo) ||
       nsCSSPseudoClasses::HasNthPairArg(pseudo) ||
       nsCSSPseudoClasses::HasSelectorListArg(pseudo))) {
    // There are no other function pseudos
    REPORT_UNEXPECTED_TOKEN(PEPseudoSelNonFunc);
    UngetToken();
    return eSelectorParsingStatus_Error;
  }

  // If it starts with "::", it better be a pseudo-element
  if (parsingPseudoElement &&
      !isPseudoElement &&
      !isAnonBox) {
    REPORT_UNEXPECTED_TOKEN(PEPseudoSelNotPE);
    UngetToken();
    return eSelectorParsingStatus_Error;
  }

  if (!parsingPseudoElement && nsCSSPseudoClasses::notPseudo == pseudo) {
    if (aIsNegated) { // :not() can't be itself negated
      REPORT_UNEXPECTED_TOKEN(PEPseudoSelDoubleNot);
      UngetToken();
      return eSelectorParsingStatus_Error;
    }
    // CSS 3 Negation pseudo-class takes one simple selector as argument
    nsSelectorParsingStatus parsingStatus =
      ParseNegatedSimpleSelector(aDataMask, aSelector);
    if (eSelectorParsingStatus_Continue != parsingStatus) {
      return parsingStatus;
    }
  }
  else if (!parsingPseudoElement && isPseudoClass) {
    aDataMask |= SEL_MASK_PCLASS;
    if (eCSSToken_Function == mToken.mType) {
      nsSelectorParsingStatus parsingStatus;
      if (nsCSSPseudoClasses::HasStringArg(pseudo)) {
        parsingStatus =
          ParsePseudoClassWithIdentArg(aSelector, pseudo, pseudoClassType);
      }
      else if (nsCSSPseudoClasses::HasNthPairArg(pseudo)) {
        parsingStatus =
          ParsePseudoClassWithNthPairArg(aSelector, pseudo, pseudoClassType);
      }
      else {
        NS_ABORT_IF_FALSE(nsCSSPseudoClasses::HasSelectorListArg(pseudo),
                          "unexpected pseudo with function token");
        parsingStatus = ParsePseudoClassWithSelectorListArg(aSelector, pseudo,
                                                            pseudoClassType);
      }
      if (eSelectorParsingStatus_Continue != parsingStatus) {
        if (eSelectorParsingStatus_Error == parsingStatus) {
          SkipUntil(')');
        }
        return parsingStatus;
      }
    }
    else {
      aSelector.AddPseudoClass(pseudo, pseudoClassType);
    }
  }
  else if (isPseudoElement || isAnonBox) {
    // Pseudo-element.  Make some more sanity checks.

    if (aIsNegated) { // pseudo-elements can't be negated
      REPORT_UNEXPECTED_TOKEN(PEPseudoSelPEInNot);
      UngetToken();
      return eSelectorParsingStatus_Error;
    }
    // CSS2 pseudo-elements and -moz-tree-* pseudo-elements are allowed
    // to have a single ':' on them.  Others (CSS3+ pseudo-elements and
    // various -moz-* pseudo-elements) must have |parsingPseudoElement|
    // set.
    if (!parsingPseudoElement &&
        !nsCSSPseudoElements::IsCSS2PseudoElement(pseudo)
#ifdef MOZ_XUL
        && !isTreePseudo
#endif
        ) {
      REPORT_UNEXPECTED_TOKEN(PEPseudoSelNewStyleOnly);
      UngetToken();
      return eSelectorParsingStatus_Error;
    }

    if (0 == (aDataMask & SEL_MASK_PELEM)) {
      aDataMask |= SEL_MASK_PELEM;
      NS_ADDREF(*aPseudoElement = pseudo);
      *aPseudoElementType = pseudoElementType;

#ifdef MOZ_XUL
      if (isTree) {
        // We have encountered a pseudoelement of the form
        // -moz-tree-xxxx(a,b,c).  We parse (a,b,c) and add each
        // item in the list to the pseudoclass list.  They will be pulled
        // from the list later along with the pseudo-element.
        if (!ParseTreePseudoElement(aPseudoElementArgs)) {
          return eSelectorParsingStatus_Error;
        }
      }
#endif

      // the next *non*whitespace token must be '{' or ',' or EOF
      if (!GetToken(PR_TRUE)) { // premature eof is ok (here!)
        return eSelectorParsingStatus_Done;
      }
      if ((mToken.IsSymbol('{') || mToken.IsSymbol(','))) {
        UngetToken();
        return eSelectorParsingStatus_Done;
      }
      REPORT_UNEXPECTED_TOKEN(PEPseudoSelTrailing);
      UngetToken();
      return eSelectorParsingStatus_Error;
    }
    else {  // multiple pseudo elements, not legal
      REPORT_UNEXPECTED_TOKEN(PEPseudoSelMultiplePE);
      UngetToken();
      return eSelectorParsingStatus_Error;
    }
  }
#ifdef DEBUG
  else {
    // We should never end up here.  Indeed, if we ended up here, we know (from
    // the current if/else cascade) that !isPseudoElement and !isAnonBox.  But
    // then due to our earlier check we know that isPseudoClass.  Since we
    // didn't fall into the isPseudoClass case in this cascade, we must have
    // parsingPseudoElement.  But we've already checked the
    // parsingPseudoElement && !isPseudoClass && !isAnonBox case and bailed if
    // it's happened.
    NS_NOTREACHED("How did this happen?");
  }
#endif
  return eSelectorParsingStatus_Continue;
}

//
// Parse the argument of a negation pseudo-class :not()
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParseNegatedSimpleSelector(PRInt32&       aDataMask,
                                          nsCSSSelector& aSelector)
{
  if (! GetToken(PR_TRUE)) { // premature eof
    REPORT_UNEXPECTED_EOF(PENegationEOF);
    return eSelectorParsingStatus_Error;
  }

  if (mToken.IsSymbol(')')) {
    REPORT_UNEXPECTED_TOKEN(PENegationBadArg);
    return eSelectorParsingStatus_Error;
  }

  // Create a new nsCSSSelector and add it to the end of
  // aSelector.mNegations.
  // Given the current parsing rules, every selector in mNegations
  // contains only one simple selector (css3 definition) within it.
  // This could easily change in future versions of CSS, and the only
  // thing we need to change to support that is this parsing code and the
  // serialization code for nsCSSSelector.
  nsCSSSelector *newSel = new nsCSSSelector();
  if (!newSel) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return eSelectorParsingStatus_Error;
  }
  nsCSSSelector* negations = &aSelector;
  while (negations->mNegations) {
    negations = negations->mNegations;
  }
  negations->mNegations = newSel;

  nsSelectorParsingStatus parsingStatus;
  if (eCSSToken_ID == mToken.mType) { // #id
    parsingStatus = ParseIDSelector(aDataMask, *newSel);
  }
  else if (mToken.IsSymbol('.')) {    // .class
    parsingStatus = ParseClassSelector(aDataMask, *newSel);
  }
  else if (mToken.IsSymbol(':')) {    // :pseudo
    parsingStatus = ParsePseudoSelector(aDataMask, *newSel, PR_TRUE,
                                        nsnull, nsnull, nsnull);
  }
  else if (mToken.IsSymbol('[')) {    // [attribute
    parsingStatus = ParseAttributeSelector(aDataMask, *newSel);
  }
  else {
    // then it should be a type element or universal selector
    parsingStatus = ParseTypeOrUniversalSelector(aDataMask, *newSel, PR_TRUE);
  }
  if (eSelectorParsingStatus_Error == parsingStatus) {
    REPORT_UNEXPECTED_TOKEN(PENegationBadInner);
    SkipUntil(')');
    return parsingStatus;
  }
  // close the parenthesis
  if (!ExpectSymbol(')', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PENegationNoClose);
    SkipUntil(')');
    return eSelectorParsingStatus_Error;
  }

  NS_ASSERTION(newSel->mNameSpace == kNameSpaceID_Unknown ||
               (!newSel->mIDList && !newSel->mClassList &&
                !newSel->mPseudoClassList && !newSel->mAttrList),
               "Need to fix the serialization code to deal with this");

  return eSelectorParsingStatus_Continue;
}

//
// Parse the argument of a pseudo-class that has an ident arg
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParsePseudoClassWithIdentArg(nsCSSSelector& aSelector,
                                            nsIAtom*       aPseudo,
                                            nsCSSPseudoClasses::Type aType)
{
  if (! GetToken(PR_TRUE)) { // premature eof
    REPORT_UNEXPECTED_EOF(PEPseudoClassArgEOF);
    return eSelectorParsingStatus_Error;
  }
  // We expect an identifier with a language abbreviation
  if (eCSSToken_Ident != mToken.mType) {
    REPORT_UNEXPECTED_TOKEN(PEPseudoClassArgNotIdent);
    UngetToken();
    return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
  }

  // -moz-locale-dir can only have values of 'ltr' or 'rtl'.
  if (aPseudo == nsCSSPseudoClasses::mozLocaleDir) {
    if (!mToken.mIdent.EqualsLiteral("ltr") &&
        !mToken.mIdent.EqualsLiteral("rtl")) {
      return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
    }
  }

  // Add the pseudo with the language parameter
  aSelector.AddPseudoClass(aPseudo, aType, mToken.mIdent.get());

  // close the parenthesis
  if (!ExpectSymbol(')', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEPseudoClassNoClose);
    return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
  }

  return eSelectorParsingStatus_Continue;
}

CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParsePseudoClassWithNthPairArg(nsCSSSelector& aSelector,
                                              nsIAtom*       aPseudo,
                                              nsCSSPseudoClasses::Type aType)
{
  PRInt32 numbers[2] = { 0, 0 };
  PRBool lookForB = PR_TRUE;

  // Follow the whitespace rules as proposed in
  // http://lists.w3.org/Archives/Public/www-style/2008Mar/0121.html

  if (! GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEPseudoClassArgEOF);
    return eSelectorParsingStatus_Error;
  }

  if (eCSSToken_Ident == mToken.mType || eCSSToken_Dimension == mToken.mType) {
    // The CSS tokenization doesn't handle :nth-child() containing - well:
    //   2n-1 is a dimension
    //   n-1 is an identifier
    // The easiest way to deal with that is to push everything from the
    // minus on back onto the scanner's pushback buffer.
    PRUint32 truncAt = 0;
    if (StringBeginsWith(mToken.mIdent, NS_LITERAL_STRING("n-"))) {
      truncAt = 1;
    } else if (StringBeginsWith(mToken.mIdent, NS_LITERAL_STRING("-n-"))) {
      truncAt = 2;
    }
    if (truncAt != 0) {
      for (PRUint32 i = mToken.mIdent.Length() - 1; i >= truncAt; --i) {
        mScanner.Pushback(mToken.mIdent[i]);
      }
      mToken.mIdent.Truncate(truncAt);
    }
  }

  if (eCSSToken_Ident == mToken.mType) {
    if (mToken.mIdent.LowerCaseEqualsLiteral("odd")) {
      numbers[0] = 2;
      numbers[1] = 1;
      lookForB = PR_FALSE;
    }
    else if (mToken.mIdent.LowerCaseEqualsLiteral("even")) {
      numbers[0] = 2;
      numbers[1] = 0;
      lookForB = PR_FALSE;
    }
    else if (mToken.mIdent.LowerCaseEqualsLiteral("n")) {
      numbers[0] = 1;
    }
    else if (mToken.mIdent.LowerCaseEqualsLiteral("-n")) {
      numbers[0] = -1;
    }
    else {
      REPORT_UNEXPECTED_TOKEN(PEPseudoClassArgNotNth);
      return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
    }
  }
  else if (eCSSToken_Number == mToken.mType) {
    if (!mToken.mIntegerValid) {
      REPORT_UNEXPECTED_TOKEN(PEPseudoClassArgNotNth);
      return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
    }
    numbers[1] = mToken.mInteger;
    lookForB = PR_FALSE;
  }
  else if (eCSSToken_Dimension == mToken.mType) {
    if (!mToken.mIntegerValid || !mToken.mIdent.LowerCaseEqualsLiteral("n")) {
      REPORT_UNEXPECTED_TOKEN(PEPseudoClassArgNotNth);
      return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
    }
    numbers[0] = mToken.mInteger;
  }
  // XXX If it's a ')', is that valid?  (as 0n+0)
  else {
    REPORT_UNEXPECTED_TOKEN(PEPseudoClassArgNotNth);
    UngetToken();
    return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
  }

  if (! GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEPseudoClassArgEOF);
    return eSelectorParsingStatus_Error;
  }
  if (lookForB && !mToken.IsSymbol(')')) {
    // The '+' or '-' sign can optionally be separated by whitespace.
    // If it is separated by whitespace from what follows it, it appears
    // as a separate token rather than part of the number token.
    PRBool haveSign = PR_FALSE;
    PRInt32 sign = 1;
    if (mToken.IsSymbol('+') || mToken.IsSymbol('-')) {
      haveSign = PR_TRUE;
      if (mToken.IsSymbol('-')) {
        sign = -1;
      }
      if (! GetToken(PR_TRUE)) {
        REPORT_UNEXPECTED_EOF(PEPseudoClassArgEOF);
        return eSelectorParsingStatus_Error;
      }
    }
    if (eCSSToken_Number != mToken.mType ||
        !mToken.mIntegerValid || mToken.mHasSign == haveSign) {
      REPORT_UNEXPECTED_TOKEN(PEPseudoClassArgNotNth);
      return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
    }
    numbers[1] = mToken.mInteger * sign;
    if (! GetToken(PR_TRUE)) {
      REPORT_UNEXPECTED_EOF(PEPseudoClassArgEOF);
      return eSelectorParsingStatus_Error;
    }
  }
  if (!mToken.IsSymbol(')')) {
    REPORT_UNEXPECTED_TOKEN(PEPseudoClassNoClose);
    return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
  }
  aSelector.AddPseudoClass(aPseudo, aType, numbers);
  return eSelectorParsingStatus_Continue;
}

//
// Parse the argument of a pseudo-class that has a selector list argument.
// Such selector lists cannot contain combinators, but can contain
// anything that goes between a pair of combinators.
//
CSSParserImpl::nsSelectorParsingStatus
CSSParserImpl::ParsePseudoClassWithSelectorListArg(nsCSSSelector& aSelector,
                                                   nsIAtom*       aPseudo,
                                                   nsCSSPseudoClasses::Type aType)
{
  nsAutoPtr<nsCSSSelectorList> slist;
  if (! ParseSelectorList(*getter_Transfers(slist), PRUnichar(')'))) {
    return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
  }

  // Check that none of the selectors in the list have combinators or
  // pseudo-elements.
  for (nsCSSSelectorList *l = slist; l; l = l->mNext) {
    nsCSSSelector *s = l->mSelectors;
    if (s->mNext || s->IsPseudoElement()) {
      return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
    }
  }

  // Add the pseudo with the selector list parameter
  aSelector.AddPseudoClass(aPseudo, aType, slist.forget());

  // close the parenthesis
  if (!ExpectSymbol(')', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEPseudoClassNoClose);
    return eSelectorParsingStatus_Error; // our caller calls SkipUntil(')')
  }

  return eSelectorParsingStatus_Continue;
}


/**
 * This is the format for selectors:
 * operator? [[namespace |]? element_name]? [ ID | class | attrib | pseudo ]*
 */
PRBool
CSSParserImpl::ParseSelector(nsCSSSelectorList* aList,
                             PRUnichar aPrevCombinator)
{
  if (! GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PESelectorEOF);
    return PR_FALSE;
  }

  nsCSSSelector* selector = aList->AddSelector(aPrevCombinator);
  nsCOMPtr<nsIAtom> pseudoElement;
  nsAutoPtr<nsPseudoClassList> pseudoElementArgs;
  nsCSSPseudoElements::Type pseudoElementType =
    nsCSSPseudoElements::ePseudo_NotPseudoElement;

  PRInt32 dataMask = 0;
  nsSelectorParsingStatus parsingStatus =
    ParseTypeOrUniversalSelector(dataMask, *selector, PR_FALSE);

  while (parsingStatus == eSelectorParsingStatus_Continue) {
    if (eCSSToken_ID == mToken.mType) { // #id
      parsingStatus = ParseIDSelector(dataMask, *selector);
    }
    else if (mToken.IsSymbol('.')) {    // .class
      parsingStatus = ParseClassSelector(dataMask, *selector);
    }
    else if (mToken.IsSymbol(':')) {    // :pseudo
      parsingStatus = ParsePseudoSelector(dataMask, *selector, PR_FALSE,
                                          getter_AddRefs(pseudoElement),
                                          getter_Transfers(pseudoElementArgs),
                                          &pseudoElementType);
    }
    else if (mToken.IsSymbol('[')) {    // [attribute
      parsingStatus = ParseAttributeSelector(dataMask, *selector);
    }
    else {  // not a selector token, we're done
      parsingStatus = eSelectorParsingStatus_Done;
      UngetToken();
      break;
    }

    if (parsingStatus != eSelectorParsingStatus_Continue) {
      break;
    }

    if (! GetToken(PR_FALSE)) { // premature eof is ok (here!)
      parsingStatus = eSelectorParsingStatus_Done;
      break;
    }
  }

  if (parsingStatus == eSelectorParsingStatus_Error) {
    return PR_FALSE;
  }

  if (!dataMask) {
    if (selector->mNext) {
      REPORT_UNEXPECTED(PESelectorGroupExtraCombinator);
    } else {
      REPORT_UNEXPECTED(PESelectorGroupNoSelector);
    }
    return PR_FALSE;
  }

  if (pseudoElementType == nsCSSPseudoElements::ePseudo_AnonBox) {
    // We got an anonymous box pseudo-element; it must be the only
    // thing in this selector group.
    if (selector->mNext || !IsUniversalSelector(*selector)) {
      REPORT_UNEXPECTED(PEAnonBoxNotAlone);
      return PR_FALSE;
    }

    // Rewrite the current selector as this pseudo-element.
    // It does not contribute to selector weight.
    selector->mLowercaseTag.swap(pseudoElement);
    selector->mPseudoClassList = pseudoElementArgs.forget();
    selector->SetPseudoType(pseudoElementType);
    return PR_TRUE;
  }

  aList->mWeight += selector->CalcWeight();

  // Pseudo-elements other than anonymous boxes are represented as
  // direct children ('>' combinator) of the rest of the selector.
  if (pseudoElement) {
    selector = aList->AddSelector('>');

    selector->mLowercaseTag.swap(pseudoElement);
    selector->mPseudoClassList = pseudoElementArgs.forget();
    selector->SetPseudoType(pseudoElementType);
  }

  return PR_TRUE;
}

css::Declaration*
CSSParserImpl::ParseDeclarationBlock(PRBool aCheckForBraces)
{
  if (aCheckForBraces) {
    if (!ExpectSymbol('{', PR_TRUE)) {
      REPORT_UNEXPECTED_TOKEN(PEBadDeclBlockStart);
      OUTPUT_ERROR();
      return nsnull;
    }
  }
  css::Declaration* declaration = new css::Declaration();
  mData.AssertInitialState();
  if (declaration) {
    for (;;) {
      PRBool changed;
      if (!ParseDeclaration(declaration, aCheckForBraces,
                            PR_TRUE, &changed)) {
        if (!SkipDeclaration(aCheckForBraces)) {
          break;
        }
        if (aCheckForBraces) {
          if (ExpectSymbol('}', PR_TRUE)) {
            break;
          }
        }
        // Since the skipped declaration didn't end the block we parse
        // the next declaration.
      }
    }
    declaration->CompressFrom(&mData);
  }
  return declaration;
}

// The types to pass to ParseColorComponent.  These correspond to the
// various datatypes that can go within rgb().
#define COLOR_TYPE_UNKNOWN 0
#define COLOR_TYPE_INTEGERS 1
#define COLOR_TYPE_PERCENTAGES 2

PRBool
CSSParserImpl::ParseColor(nsCSSValue& aValue)
{
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEColorEOF);
    return PR_FALSE;
  }

  nsCSSToken* tk = &mToken;
  nscolor rgba;
  switch (tk->mType) {
    case eCSSToken_ID:
    case eCSSToken_Ref:
      // #xxyyzz
      if (NS_HexToRGB(tk->mIdent, &rgba)) {
        aValue.SetColorValue(rgba);
        return PR_TRUE;
      }
      break;

    case eCSSToken_Ident:
      if (NS_ColorNameToRGB(tk->mIdent, &rgba)) {
        aValue.SetStringValue(tk->mIdent, eCSSUnit_Ident);
        return PR_TRUE;
      }
      else {
        nsCSSKeyword keyword = nsCSSKeywords::LookupKeyword(tk->mIdent);
        if (eCSSKeyword_UNKNOWN < keyword) { // known keyword
          PRInt32 value;
          if (nsCSSProps::FindKeyword(keyword, nsCSSProps::kColorKTable, value)) {
            aValue.SetIntValue(value, eCSSUnit_EnumColor);
            return PR_TRUE;
          }
        }
      }
      break;
    case eCSSToken_Function:
      if (mToken.mIdent.LowerCaseEqualsLiteral("rgb")) {
        // rgb ( component , component , component )
        PRUint8 r, g, b;
        PRInt32 type = COLOR_TYPE_UNKNOWN;
        if (ParseColorComponent(r, type, ',') &&
            ParseColorComponent(g, type, ',') &&
            ParseColorComponent(b, type, ')')) {
          aValue.SetColorValue(NS_RGB(r,g,b));
          return PR_TRUE;
        }
        SkipUntil(')');
        return PR_FALSE;
      }
      else if (mToken.mIdent.LowerCaseEqualsLiteral("-moz-rgba") ||
               mToken.mIdent.LowerCaseEqualsLiteral("rgba")) {
        // rgba ( component , component , component , opacity )
        PRUint8 r, g, b, a;
        PRInt32 type = COLOR_TYPE_UNKNOWN;
        if (ParseColorComponent(r, type, ',') &&
            ParseColorComponent(g, type, ',') &&
            ParseColorComponent(b, type, ',') &&
            ParseColorOpacity(a)) {
          aValue.SetColorValue(NS_RGBA(r, g, b, a));
          return PR_TRUE;
        }
        SkipUntil(')');
        return PR_FALSE;
      }
      else if (mToken.mIdent.LowerCaseEqualsLiteral("hsl")) {
        // hsl ( hue , saturation , lightness )
        // "hue" is a number, "saturation" and "lightness" are percentages.
        if (ParseHSLColor(rgba, ')')) {
          aValue.SetColorValue(rgba);
          return PR_TRUE;
        }
        SkipUntil(')');
        return PR_FALSE;
      }
      else if (mToken.mIdent.LowerCaseEqualsLiteral("-moz-hsla") ||
               mToken.mIdent.LowerCaseEqualsLiteral("hsla")) {
        // hsla ( hue , saturation , lightness , opacity )
        // "hue" is a number, "saturation" and "lightness" are percentages,
        // "opacity" is a number.
        PRUint8 a;
        if (ParseHSLColor(rgba, ',') &&
            ParseColorOpacity(a)) {
          aValue.SetColorValue(NS_RGBA(NS_GET_R(rgba), NS_GET_G(rgba),
                                       NS_GET_B(rgba), a));
          return PR_TRUE;
        }
        SkipUntil(')');
        return PR_FALSE;
      }
      break;
    default:
      break;
  }

  // try 'xxyyzz' without '#' prefix for compatibility with IE and Nav4x (bug 23236 and 45804)
  if (mNavQuirkMode && !IsParsingCompoundProperty()) {
    // - If the string starts with 'a-f', the nsCSSScanner builds the
    //   token as a eCSSToken_Ident and we can parse the string as a
    //   'xxyyzz' RGB color.
    // - If it only contains '0-9' digits, the token is a
    //   eCSSToken_Number and it must be converted back to a 6
    //   characters string to be parsed as a RGB color.
    // - If it starts with '0-9' and contains any 'a-f', the token is a
    //   eCSSToken_Dimension, the mNumber part must be converted back to
    //   a string and the mIdent part must be appended to that string so
    //   that the resulting string has 6 characters.
    // Note: This is a hack for Nav compatibility.  Do not attempt to
    // simplify it by hacking into the ncCSSScanner.  This would be very
    // bad.
    nsAutoString str;
    char buffer[20];
    switch (tk->mType) {
      case eCSSToken_Ident:
        str.Assign(tk->mIdent);
        break;

      case eCSSToken_Number:
        if (tk->mIntegerValid) {
          PR_snprintf(buffer, sizeof(buffer), "%06d", tk->mInteger);
          str.AssignWithConversion(buffer);
        }
        break;

      case eCSSToken_Dimension:
        if (tk->mIdent.Length() <= 6) {
          PR_snprintf(buffer, sizeof(buffer), "%06.0f", tk->mNumber);
          nsAutoString temp;
          temp.AssignWithConversion(buffer);
          temp.Right(str, 6 - tk->mIdent.Length());
          str.Append(tk->mIdent);
        }
        break;
      default:
        // There is a whole bunch of cases that are
        // not handled by this switch.  Ignore them.
        break;
    }
    if (NS_HexToRGB(str, &rgba)) {
      aValue.SetColorValue(rgba);
      return PR_TRUE;
    }
  }

  // It's not a color
  REPORT_UNEXPECTED_TOKEN(PEColorNotColor);
  UngetToken();
  return PR_FALSE;
}

// aType will be set if we have already parsed other color components
// in this color spec
PRBool
CSSParserImpl::ParseColorComponent(PRUint8& aComponent,
                                   PRInt32& aType,
                                   char aStop)
{
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEColorComponentEOF);
    return PR_FALSE;
  }
  float value;
  nsCSSToken* tk = &mToken;
  switch (tk->mType) {
  case eCSSToken_Number:
    switch (aType) {
      case COLOR_TYPE_UNKNOWN:
        aType = COLOR_TYPE_INTEGERS;
        break;
      case COLOR_TYPE_INTEGERS:
        break;
      case COLOR_TYPE_PERCENTAGES:
        REPORT_UNEXPECTED_TOKEN(PEExpectedPercent);
        UngetToken();
        return PR_FALSE;
      default:
        NS_NOTREACHED("Someone forgot to add the new color component type in here");
    }

    if (!mToken.mIntegerValid) {
      REPORT_UNEXPECTED_TOKEN(PEExpectedInt);
      UngetToken();
      return PR_FALSE;
    }
    value = tk->mNumber;
    break;
  case eCSSToken_Percentage:
    switch (aType) {
      case COLOR_TYPE_UNKNOWN:
        aType = COLOR_TYPE_PERCENTAGES;
        break;
      case COLOR_TYPE_INTEGERS:
        REPORT_UNEXPECTED_TOKEN(PEExpectedInt);
        UngetToken();
        return PR_FALSE;
      case COLOR_TYPE_PERCENTAGES:
        break;
      default:
        NS_NOTREACHED("Someone forgot to add the new color component type in here");
    }
    value = tk->mNumber * 255.0f;
    break;
  default:
    REPORT_UNEXPECTED_TOKEN(PEColorBadRGBContents);
    UngetToken();
    return PR_FALSE;
  }
  if (ExpectSymbol(aStop, PR_TRUE)) {
    if (value < 0.0f) value = 0.0f;
    if (value > 255.0f) value = 255.0f;
    aComponent = NSToIntRound(value);
    return PR_TRUE;
  }
  const PRUnichar stopString[] = { PRUnichar(aStop), PRUnichar(0) };
  const PRUnichar *params[] = {
    nsnull,
    stopString
  };
  REPORT_UNEXPECTED_TOKEN_P(PEColorComponentBadTerm, params);
  return PR_FALSE;
}


PRBool
CSSParserImpl::ParseHSLColor(nscolor& aColor,
                             char aStop)
{
  float h, s, l;

  // Get the hue
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEColorHueEOF);
    return PR_FALSE;
  }
  if (mToken.mType != eCSSToken_Number) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedNumber);
    UngetToken();
    return PR_FALSE;
  }
  h = mToken.mNumber;
  h /= 360.0f;
  // hue values are wraparound
  h = h - floor(h);

  if (!ExpectSymbol(',', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedComma);
    return PR_FALSE;
  }

  // Get the saturation
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEColorSaturationEOF);
    return PR_FALSE;
  }
  if (mToken.mType != eCSSToken_Percentage) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedPercent);
    UngetToken();
    return PR_FALSE;
  }
  s = mToken.mNumber;
  if (s < 0.0f) s = 0.0f;
  if (s > 1.0f) s = 1.0f;

  if (!ExpectSymbol(',', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedComma);
    return PR_FALSE;
  }

  // Get the lightness
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEColorLightnessEOF);
    return PR_FALSE;
  }
  if (mToken.mType != eCSSToken_Percentage) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedPercent);
    UngetToken();
    return PR_FALSE;
  }
  l = mToken.mNumber;
  if (l < 0.0f) l = 0.0f;
  if (l > 1.0f) l = 1.0f;

  if (ExpectSymbol(aStop, PR_TRUE)) {
    aColor = NS_HSL2RGB(h, s, l);
    return PR_TRUE;
  }

  const PRUnichar stopString[] = { PRUnichar(aStop), PRUnichar(0) };
  const PRUnichar *params[] = {
    nsnull,
    stopString
  };
  REPORT_UNEXPECTED_TOKEN_P(PEColorComponentBadTerm, params);
  return PR_FALSE;
}


PRBool
CSSParserImpl::ParseColorOpacity(PRUint8& aOpacity)
{
  if (!GetToken(PR_TRUE)) {
    REPORT_UNEXPECTED_EOF(PEColorOpacityEOF);
    return PR_FALSE;
  }

  if (mToken.mType != eCSSToken_Number) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedNumber);
    UngetToken();
    return PR_FALSE;
  }

  if (mToken.mNumber < 0.0f) {
    mToken.mNumber = 0.0f;
  } else if (mToken.mNumber > 1.0f) {
    mToken.mNumber = 1.0f;
  }

  PRUint8 value = nsStyleUtil::FloatToColorComponent(mToken.mNumber);
  // Need to compare to something slightly larger
  // than 0.5 due to floating point inaccuracies.
  NS_ASSERTION(fabs(255.0f*mToken.mNumber - value) <= 0.51f,
               "FloatToColorComponent did something weird");

  if (!ExpectSymbol(')', PR_TRUE)) {
    REPORT_UNEXPECTED_TOKEN(PEExpectedCloseParen);
    return PR_FALSE;
  }

  aOpacity = value;

  return PR_TRUE;
}

#ifdef MOZ_XUL
PRBool
CSSParserImpl::ParseTreePseudoElement(nsPseudoClassList **aPseudoElementArgs)
{
  // The argument to a tree pseudo-element is a sequence of identifiers
  // that are either space- or comma-separated.  (Was the intent to
  // allow only comma-separated?  That's not what was done.)
  nsCSSSelector fakeSelector; // so we can reuse AddPseudoClass

  while (!ExpectSymbol(')', PR_TRUE)) {
    if (!GetToken(PR_TRUE)) {
      return PR_FALSE;
    }
    if (eCSSToken_Ident == mToken.mType) {
      nsCOMPtr<nsIAtom> pseudo = do_GetAtom(mToken.mIdent);
      fakeSelector.AddPseudoClass(pseudo,
                                  nsCSSPseudoClasses::ePseudoClass_NotPseudoClass);
    }
    else if (!mToken.IsSymbol(',')) {
      UngetToken();
      SkipUntil(')');
      return PR_FALSE;
    }
  }
  *aPseudoElementArgs = fakeSelector.mPseudoClassList;
  fakeSelector.mPseudoClassList = nsnull;
  return PR_TRUE;
}
#endif

//----------------------------------------------------------------------

PRBool
CSSParserImpl::ParseDeclaration(css::Declaration* aDeclaration,
                                PRBool aCheckForBraces,
                                PRBool aMustCallValueAppended,
                                PRBool* aChanged)
{
  mTempData.AssertInitialState();

  // Get property name
  nsCSSToken* tk = &mToken;
  nsAutoString propertyName;
  for (;;) {
    if (!GetToken(PR_TRUE)) {
      if (aCheckForBraces) {
        REPORT_UNEXPECTED_EOF(PEDeclEndEOF);
      }
      return PR_FALSE;
    }
    if (eCSSToken_Ident == tk->mType) {
      propertyName = tk->mIdent;
      // grab the ident before the ExpectSymbol trashes the token
      if (!ExpectSymbol(':', PR_TRUE)) {
        REPORT_UNEXPECTED_TOKEN(PEParseDeclarationNoColon);
        REPORT_UNEXPECTED(PEDeclDropped);
        OUTPUT_ERROR();
        return PR_FALSE;
      }
      break;
    }
    if (tk->IsSymbol(';')) {
      // dangling semicolons are skipped
      continue;
    }

    if (!tk->IsSymbol('}')) {
      REPORT_UNEXPECTED_TOKEN(PEParseDeclarationDeclExpected);
      REPORT_UNEXPECTED(PEDeclSkipped);
      OUTPUT_ERROR();
    }
    // Not a declaration...
    UngetToken();
    return PR_FALSE;
  }

  // Map property name to its ID and then parse the property
  nsCSSProperty propID = nsCSSProps::LookupProperty(propertyName);
  if (eCSSProperty_UNKNOWN == propID) { // unknown property
    if (!NonMozillaVendorIdentifier(propertyName)) {
      const PRUnichar *params[] = {
        propertyName.get()
      };
      REPORT_UNEXPECTED_P(PEUnknownProperty, params);
      REPORT_UNEXPECTED(PEDeclDropped);
      OUTPUT_ERROR();
    }

    return PR_FALSE;
  }
  if (! ParseProperty(propID)) {
    // XXX Much better to put stuff in the value parsers instead...
    const PRUnichar *params[] = {
      propertyName.get()
    };
    REPORT_UNEXPECTED_P(PEValueParsingError, params);
    REPORT_UNEXPECTED(PEDeclDropped);
    OUTPUT_ERROR();
    mTempData.ClearProperty(propID);
    mTempData.AssertInitialState();
    return PR_FALSE;
  }
  CLEAR_ERROR();

  // Look for "!important".
  PriorityParsingStatus status = ParsePriority();

  // Look for a semicolon or close brace.
  if (status != ePriority_Error) {
    if (!GetToken(PR_TRUE)) {
      // EOF is always ok
    } else if (mToken.IsSymbol(';')) {
      // semicolon is always ok
    } else if (mToken.IsSymbol('}')) {
      // brace is ok if aCheckForBraces, but don't eat it
      UngetToken();
      if (!aCheckForBraces) {
        status = ePriority_Error;
      }
    } else {
      UngetToken();
      status = ePriority_Error;
    }
  }

  if (status == ePriority_Error) {
    if (aCheckForBraces) {
      REPORT_UNEXPECTED_TOKEN(PEBadDeclOrRuleEnd2);
    } else {
      REPORT_UNEXPECTED(PEBadDeclEnd);
    }
    REPORT_UNEXPECTED(PEDeclDropped);
    OUTPUT_ERROR();
    mTempData.ClearProperty(propID);
    mTempData.AssertInitialState();
    return PR_FALSE;
  }

  *aChanged |= mData.TransferFromBlock(mTempData, propID,
                                       status == ePriority_Important,
                                       PR_FALSE, aMustCallValueAppended,
                                       aDeclaration);
  return PR_TRUE;
}

static const nsCSSProperty kBorderTopIDs[] = {
  eCSSProperty_border_top_width,
  eCSSProperty_border_top_style,
  eCSSProperty_border_top_color
};
static const nsCSSProperty kBorderRightIDs[] = {
  eCSSProperty_border_right_width_value,
  eCSSProperty_border_right_style_value,
  eCSSProperty_border_right_color_value,
  eCSSProperty_border_right_width,
  eCSSProperty_border_right_style,
  eCSSProperty_border_right_color
};
static const nsCSSProperty kBorderBottomIDs[] = {
  eCSSProperty_border_bottom_width,
  eCSSProperty_border_bottom_style,
  eCSSProperty_border_bottom_color
};
static const nsCSSProperty kBorderLeftIDs[] = {
  eCSSProperty_border_left_width_value,
  eCSSProperty_border_left_style_value,
  eCSSProperty_border_left_color_value,
  eCSSProperty_border_left_width,
  eCSSProperty_border_left_style,
  eCSSProperty_border_left_color
};
static const nsCSSProperty kBorderStartIDs[] = {
  eCSSProperty_border_start_width_value,
  eCSSProperty_border_start_style_value,
  eCSSProperty_border_start_color_value,
  eCSSProperty_border_start_width,
  eCSSProperty_border_start_style,
  eCSSProperty_border_start_color
};
static const nsCSSProperty kBorderEndIDs[] = {
  eCSSProperty_border_end_width_value,
  eCSSProperty_border_end_style_value,
  eCSSProperty_border_end_color_value,
  eCSSProperty_border_end_width,
  eCSSProperty_border_end_style,
  eCSSProperty_border_end_color
};
static const nsCSSProperty kColumnRuleIDs[] = {
  eCSSProperty__moz_column_rule_width,
  eCSSProperty__moz_column_rule_style,
  eCSSProperty__moz_column_rule_color
};

PRBool
CSSParserImpl::ParseEnum(nsCSSValue& aValue,
                         const PRInt32 aKeywordTable[])
{
  nsSubstring* ident = NextIdent();
  if (nsnull == ident) {
    return PR_FALSE;
  }
  nsCSSKeyword keyword = nsCSSKeywords::LookupKeyword(*ident);
  if (eCSSKeyword_UNKNOWN < keyword) {
    PRInt32 value;
    if (nsCSSProps::FindKeyword(keyword, aKeywordTable, value)) {
      aValue.SetIntValue(value, eCSSUnit_Enumerated);
      return PR_TRUE;
    }
  }

  // Put the unknown identifier back and return
  UngetToken();
  return PR_FALSE;
}


struct UnitInfo {
  char name[6];  // needs to be long enough for the longest unit, with
                 // terminating null.
  PRUint32 length;
  nsCSSUnit unit;
  PRInt32 type;
};

#define STR_WITH_LEN(_str) \
  _str, sizeof(_str) - 1

const UnitInfo UnitData[] = {
  { STR_WITH_LEN("px"), eCSSUnit_Pixel, VARIANT_LENGTH },
  { STR_WITH_LEN("em"), eCSSUnit_EM, VARIANT_LENGTH },
  { STR_WITH_LEN("ex"), eCSSUnit_XHeight, VARIANT_LENGTH },
  { STR_WITH_LEN("pt"), eCSSUnit_Point, VARIANT_LENGTH },
  { STR_WITH_LEN("in"), eCSSUnit_Inch, VARIANT_LENGTH },
  { STR_WITH_LEN("cm"), eCSSUnit_Centimeter, VARIANT_LENGTH },
  { STR_WITH_LEN("ch"), eCSSUnit_Char, VARIANT_LENGTH },
  { STR_WITH_LEN("rem"), eCSSUnit_RootEM, VARIANT_LENGTH },
  { STR_WITH_LEN("mm"), eCSSUnit_Millimeter, VARIANT_LENGTH },
  { STR_WITH_LEN("mozmm"), eCSSUnit_PhysicalMillimeter, VARIANT_LENGTH },
  { STR_WITH_LEN("pc"), eCSSUnit_Pica, VARIANT_LENGTH },
  { STR_WITH_LEN("deg"), eCSSUnit_Degree, VARIANT_ANGLE },
  { STR_WITH_LEN("grad"), eCSSUnit_Grad, VARIANT_ANGLE },
  { STR_WITH_LEN("rad"), eCSSUnit_Radian, VARIANT_ANGLE },
  { STR_WITH_LEN("hz"), eCSSUnit_Hertz, VARIANT_FREQUENCY },
  { STR_WITH_LEN("khz"), eCSSUnit_Kilohertz, VARIANT_FREQUENCY },
  { STR_WITH_LEN("s"), eCSSUnit_Seconds, VARIANT_TIME },
  { STR_WITH_LEN("ms"), eCSSUnit_Milliseconds, VARIANT_TIME }
};

#undef STR_WITH_LEN

PRBool
CSSParserImpl::TranslateDimension(nsCSSValue& aValue,
                                  PRInt32 aVariantMask,
                                  float aNumber,
                                  const nsString& aUnit)
{
  nsCSSUnit units;
  PRInt32   type = 0;
  if (!aUnit.IsEmpty()) {
    PRUint32 i;
    for (i = 0; i < NS_ARRAY_LENGTH(UnitData); ++i) {
      if (aUnit.LowerCaseEqualsASCII(UnitData[i].name,
                                     UnitData[i].length)) {
        units = UnitData[i].unit;
        type = UnitData[i].type;
        break;
      }
    }

    if (i == NS_ARRAY_LENGTH(UnitData)) {
      // Unknown unit
      return PR_FALSE;
    }
  } else {
    // Must be a zero number...
    NS_ASSERTION(0 == aNumber, "numbers without units must be 0");
    if ((VARIANT_LENGTH & aVariantMask) != 0) {
      units = eCSSUnit_Point;
      type = VARIANT_LENGTH;
    }
    else if ((VARIANT_ANGLE & aVariantMask) != 0) {
      NS_ASSERTION(aVariantMask & VARIANT_ZERO_ANGLE,
                   "must have allowed zero angle");
      units = eCSSUnit_Degree;
      type = VARIANT_ANGLE;
    }
    else {
      NS_ERROR("Variant mask does not include dimension; why were we called?");
      return PR_FALSE;
    }
  }
  if ((type & aVariantMask) != 0) {
    aValue.SetFloatValue(aNumber, units);
    return PR_TRUE;
  }
  return PR_FALSE;
}

// Note that this does include VARIANT_CALC, which is numeric.  This is
// because calc() parsing, as proposed, drops range restrictions inside
// the calc() expression and clamps the result of the calculation to the
// range.
#define VARIANT_ALL_NONNUMERIC \
  VARIANT_KEYWORD | \
  VARIANT_COLOR | \
  VARIANT_URL | \
  VARIANT_STRING | \
  VARIANT_COUNTER | \
  VARIANT_ATTR | \
  VARIANT_IDENTIFIER | \
  VARIANT_AUTO | \
  VARIANT_INHERIT | \
  VARIANT_NONE | \
  VARIANT_NORMAL | \
  VARIANT_SYSFONT | \
  VARIANT_GRADIENT | \
  VARIANT_CUBIC_BEZIER | \
  VARIANT_ALL | \
  VARIANT_CALC

// Note that callers passing VARIANT_CALC in aVariantMask will get
// full-range parsing inside the calc() expression, and the code that
// computes the calc will be required to clamp the resulting value to an
// appropriate range.
PRBool
CSSParserImpl::ParseNonNegativeVariant(nsCSSValue& aValue,
                                       PRInt32 aVariantMask,
                                       const PRInt32 aKeywordTable[])
{
  // The variant mask must only contain non-numeric variants or the ones
  // that we specifically handle.
  NS_ABORT_IF_FALSE((aVariantMask & ~(VARIANT_ALL_NONNUMERIC |
                                      VARIANT_NUMBER |
                                      VARIANT_LENGTH |
                                      VARIANT_PERCENT |
                                      VARIANT_INTEGER)) == 0,
                    "need to update code below to handle additional variants");

  if (ParseVariant(aValue, aVariantMask, aKeywordTable)) {
    if (eCSSUnit_Number == aValue.GetUnit() ||
        aValue.IsLengthUnit()){
      if (aValue.GetFloatValue() < 0) {
        UngetToken();
        return PR_FALSE;
      }
    }
    else if (aValue.GetUnit() == eCSSUnit_Percent) {
      if (aValue.GetPercentValue() < 0) {
        UngetToken();
        return PR_FALSE;
      }
    } else if (aValue.GetUnit() == eCSSUnit_Integer) {
      if (aValue.GetIntValue() < 0) {
        UngetToken();
        return PR_FALSE;
      }
    }
    return PR_TRUE;
  }
  return PR_FALSE;
}

// Note that callers passing VARIANT_CALC in aVariantMask will get
// full-range parsing inside the calc() expression, and the code that
// computes the calc will be required to clamp the resulting value to an
// appropriate range.
PRBool
CSSParserImpl::ParsePositiveNonZeroVariant(nsCSSValue& aValue,
                                           PRInt32 aVariantMask,
                                           const PRInt32 aKeywordTable[])
{
  // The variant mask must only contain non-numeric variants or the ones
  // that we specifically handle.
  NS_ABORT_IF_FALSE((aVariantMask & ~(VARIANT_ALL_NONNUMERIC |
                                      VARIANT_INTEGER)) == 0,
                    "need to update code below to handle additional variants");

  if (ParseVariant(aValue, aVariantMask, aKeywordTable)) {
    if (aValue.GetUnit() == eCSSUnit_Integer) {
      if (aValue.GetIntValue() <= 0) {
        UngetToken();
        return PR_FALSE;
      }
    }
    return PR_TRUE;
  }
  return PR_FALSE;
}

// Assigns to aValue iff it returns PR_TRUE.
PRBool
CSSParserImpl::ParseVariant(nsCSSValue& aValue,
                            PRInt32 aVariantMask,
                            const PRInt32 aKeywordTable[])
{
  NS_ASSERTION(IsParsingCompoundProperty() ||
               ((~aVariantMask) & (VARIANT_LENGTH|VARIANT_COLOR)),
               "cannot distinguish lengths and colors in quirks mode");

  if (!GetToken(PR_TRUE)) {
    return PR_FALSE;
  }
  nsCSSToken* tk = &mToken;
  if (((aVariantMask & (VARIANT_AHK | VARIANT_NORMAL | VARIANT_NONE | VARIANT_ALL)) != 0) &&
      (eCSSToken_Ident == tk->mType)) {
    nsCSSKeyword keyword = nsCSSKeywords::LookupKeyword(tk->mIdent);
    if (eCSSKeyword_UNKNOWN < keyword) { // known keyword
      if ((aVariantMask & VARIANT_AUTO) != 0) {
        if (eCSSKeyword_auto == keyword) {
          aValue.SetAutoValue();
          return PR_TRUE;
        }
      }
      if ((aVariantMask & VARIANT_INHERIT) != 0) {
        // XXX Should we check IsParsingCompoundProperty, or do all
        // callers handle it?  (Not all callers set it, though, since
        // they want the quirks that are disabled by setting it.)
        if (eCSSKeyword_inherit == keyword) {
          aValue.SetInheritValue();
          return PR_TRUE;
        }
        else if (eCSSKeyword__moz_initial == keyword) { // anything that can inherit can also take an initial val.
          aValue.SetInitialValue();
          return PR_TRUE;
        }
      }
      if ((aVariantMask & VARIANT_NONE) != 0) {
        if (eCSSKeyword_none == keyword) {
          aValue.SetNoneValue();
          return PR_TRUE;
        }
      }
      if ((aVariantMask & VARIANT_ALL) != 0) {
        if (eCSSKeyword_all == keyword) {
          aValue.SetAllValue();
          return PR_TRUE;
        }
      }
      if ((aVariantMask & VARIANT_NORMAL) != 0) {
        if (eCSSKeyword_normal == keyword) {
          aValue.SetNormalValue();
          return PR_TRUE;
        }
      }
      if ((aVariantMask & VARIANT_SYSFONT) != 0) {
        if (eCSSKeyword__moz_use_system_font == keyword &&
            !IsParsingCompoundProperty()) {
          aValue.SetSystemFontValue();
          return PR_TRUE;
        }
      }
      if ((aVariantMask & VARIANT_KEYWORD) != 0) {
        PRInt32 value;
        if (nsCSSProps::FindKeyword(keyword, aKeywordTable, value)) {
          aValue.SetIntValue(value, eCSSUnit_Enumerated);
          return PR_TRUE;
        }
      }
    }
  }
  if (((aVariantMask & (VARIANT_LENGTH | VARIANT_ANGLE |
                        VARIANT_FREQUENCY | VARIANT_TIME)) != 0 &&
       eCSSToken_Dimension == tk->mType) ||
      ((aVariantMask & (VARIANT_LENGTH | VARIANT_ZERO_ANGLE)) != 0 &&
       eCSSToken_Number == tk->mType &&
       tk->mNumber == 0.0f)) {
    if (TranslateDimension(aValue, aVariantMask, tk->mNumber, tk->mIdent)) {
      return PR_TRUE;
    }
    // Put the token back; we didn't parse it, so we shouldn't consume it
    UngetToken();
    return PR_FALSE;
  }
  if (((aVariantMask & VARIANT_PERCENT) != 0) &&
      (eCSSToken_Percentage == tk->mType)) {
    aValue.SetPercentValue(tk->mNumber);
    return PR_TRUE;
  }
  if (((aVariantMask & VARIANT_NUMBER) != 0) &&
      (eCSSToken_Number == tk->mType)) {
    aValue.SetFloatValue(tk->mNumber, eCSSUnit_Number);
    return PR_TRUE;
  }
  if (((aVariantMask & VARIANT_INTEGER) != 0) &&
      (eCSSToken_Number == tk->mType) && tk->mIntegerValid) {
    aValue.SetIntValue(tk->mInteger, eCSSUnit_Integer);
    return PR_TRUE;
  }
  if (mNavQuirkMode && !IsParsingCompoundProperty()) { // NONSTANDARD: Nav interprets unitless numbers as px
    if (((aVariantMask & VARIANT_LENGTH) != 0) &&
        (eCSSToken_Number == tk->mType)) {
      aValue.SetFloatValue(tk->mNumber, eCSSUnit_Pixel);
      return PR_TRUE;
    }
  }

#ifdef  MOZ_SVG
  if (IsSVGMode() && !IsParsingCompoundProperty()) {
    // STANDARD: SVG Spec states that lengths and coordinates can be unitless
    // in which case they default to user-units (1 px = 1 user unit)
    if (((aVariantMask & VARIANT_LENGTH) != 0) &&
        (eCSSToken_Number == tk->mType)) {
      aValue.SetFloatValue(tk->mNumber, eCSSUnit_Pixel);
      return PR_TRUE;
    }
  }
#endif

  if (((aVariantMask & VARIANT_URL) != 0) &&
      (eCSSToken_Function == tk->mType) &&
      tk->mIdent.LowerCaseEqualsLiteral("url")) {
    if (ParseURL(aValue)) {
      return PR_TRUE;
    }
    return PR_FALSE;
  }
  if ((aVariantMask & VARIANT_GRADIENT) != 0 &&
      eCSSToken_Function == tk->mType) {
    // a generated gradient
    if (tk->mIdent.LowerCaseEqualsLiteral("-moz-linear-gradient"))
      return ParseGradient(aValue, PR_FALSE, PR_FALSE);

    if (tk->mIdent.LowerCaseEqualsLiteral("-moz-radial-gradient"))
      return ParseGradient(aValue, PR_TRUE, PR_FALSE);

    if (tk->mIdent.LowerCaseEqualsLiteral("-moz-repeating-linear-gradient"))
      return ParseGradient(aValue, PR_FALSE, PR_TRUE);

    if (tk->mIdent.LowerCaseEqualsLiteral("-moz-repeating-radial-gradient"))
      return ParseGradient(aValue, PR_TRUE, PR_TRUE);
  }
  if ((aVariantMask & VARIANT_IMAGE_RECT) != 0 &&
      eCSSToken_Function == tk->mType &&
      tk->mIdent.LowerCaseEqualsLiteral("-moz-image-rect")) {
    return ParseImageRect(aValue);
  }
  if ((aVariantMask & VARIANT_ELEMENT) != 0 &&
      eCSSToken_Function == tk->mType &&
      tk->mIdent.LowerCaseEqualsLiteral("-moz-element")) {
    return ParseElement(aValue);
  }
  if ((aVariantMask & VARIANT_COLOR) != 0) {
    if ((mNavQuirkMode && !IsParsingCompoundProperty()) || // NONSTANDARD: Nav interprets 'xxyyzz' values even without '#' prefix
        (eCSSToken_ID == tk->mType) ||
        (eCSSToken_Ref == tk->mType) ||
        (eCSSToken_Ident == tk->mType) ||
        ((eCSSToken_Function == tk->mType) &&
         (tk->mIdent.LowerCaseEqualsLiteral("rgb") ||
          tk->mIdent.LowerCaseEqualsLiteral("hsl") ||
          tk->mIdent.LowerCaseEqualsLiteral("-moz-rgba") ||
          tk->mIdent.LowerCaseEqualsLiteral("-moz-hsla") ||
          tk->mIdent.LowerCaseEqualsLiteral("rgba") ||
          tk->mIdent.LowerCaseEqualsLiteral("hsla"))))
    {
      // Put token back so that parse color can get it
      UngetToken();
      if (ParseColor(aValue)) {
        return PR_TRUE;
      }
      return PR_FALSE;
    }
  }
  if (((aVariantMask & VARIANT_STRING) != 0) &&
      (eCSSToken_String == tk->mType)) {
    nsAutoString  buffer;
    buffer.Append(tk->mIdent);
    aValue.SetStringValue(buffer, eCSSUnit_String);
    return PR_TRUE;
  }
  if (((aVariantMask & VARIANT_IDENTIFIER) != 0) &&
      (eCSSToken_Ident == tk->mType)) {
    aValue.SetStringValue(tk->mIdent, eCSSUnit_Ident);
    return PR_TRUE;
  }
  if (((aVariantMask & VARIANT_COUNTER) != 0) &&
      (eCSSToken_Function == tk->mType) &&
      (tk->mIdent.LowerCaseEqualsLiteral("counter") ||
       tk->mIdent.LowerCaseEqualsLiteral("counters"))) {
    return ParseCounter(aValue);
  }
  if (((aVariantMask & VARIANT_ATTR) != 0) &&
      (eCSSToken_Function == tk->mType) &&
      tk->mIdent.LowerCaseEqualsLiteral("attr")) {
    if (!ParseAttr(aValue)) {
      SkipUntil(')');
      return PR_FALSE;
    }
    return PR_TRUE;
  }
  if (((aVariantMask & VARIANT_CUBIC_BEZIER) != 0) &&
      (eCSSToken_Function == tk->mType)) {
     if (tk->mIdent.LowerCaseEqualsLiteral("cubic-bezier")) {
      if (!ParseTransitionTimingFunctionValues(aValue)) {
        SkipUntil(')');
        return PR_FALSE;
      }
      return PR_TRUE;
    }
  }
  if ((aVariantMask & VARIANT_CALC) &&
      (eCSSToken_Function == tk->mType) &&
      tk->mIdent.LowerCaseEqualsLiteral("-moz-calc")) {
    // calc() currently allows only lengths and percents inside it.
    return ParseCalc(aValue, aVariantMask & VARIANT_LP);
  }

  UngetToken();
  return PR_FALSE;
}


PRBool
CSSParserImpl::ParseCounter(nsCSSValue& aValue)
{
  nsCSSUnit unit = (mToken.mIdent.LowerCaseEqualsLiteral("counter") ?
                    eCSSUnit_Counter : eCSSUnit_Counters);

  // A non-iterative for loop to break out when an error occurs.
  for (;;) {
    if (!GetToken(PR_TRUE)) {
      break;
    }
    if (eCSSToken_Ident != mToken.mType) {
      UngetToken();
      break;
    }

    nsRefPtr<nsCSSValue::Array> val =
      nsCSSValue::Array::Create(unit == eCSSUnit_Counter ? 2 : 3);

    val->Item(0).SetStringValue(mToken.mIdent, eCSSUnit_Ident);

    if (eCSSUnit_Counters == unit) {
      // must have a comma and then a separator string
      if (!ExpectSymbol(',', PR_TRUE) || !GetToken(PR_TRUE)) {
        break;
      }
      if (eCSSToken_String != mToken.mType) {
        UngetToken();
        break;
      }
      val->Item(1).SetStringValue(mToken.mIdent, eCSSUnit_String);
    }

    // get optional type
    PRInt32 type = NS_STYLE_LIST_STYLE_DECIMAL;
    if (ExpectSymbol(',', PR_TRUE)) {
      if (!GetToken(PR_TRUE)) {
        break;
      }
      nsCSSKeyword keyword;
      if (eCSSToken_Ident != mToken.mType ||
          (keyword = nsCSSKeywords::LookupKeyword(mToken.mIdent)) ==
            eCSSKeyword_UNKNOWN ||
          !nsCSSProps::FindKeyword(keyword, nsCSSProps::kListStyleKTable,
                                   type)) {
        UngetToken();
        break;
      }
    }

    PRInt32 typeItem = eCSSUnit_Counters == unit ? 2 : 1;
    val->Item(typeItem).SetIntValue(type, eCSSUnit_Enumerated);

    if (!ExpectSymbol(')', PR_TRUE)) {
      break;
    }

    aValue.SetArrayValue(val, unit);
    return PR_TRUE;
  }

  SkipUntil(')');
  return PR_FALSE;
}

PRBool
CSSParserImpl::ParseAttr(nsCSSValue& aValue)
{
  if (!GetToken(PR_TRUE)) {
    return PR_FALSE;
  }

  nsAutoString attr;
  if (eCSSToken_Ident == mToken.mType) {  // attr name or namespace
    nsAutoString  holdIdent(mToken.mIdent);
    if (ExpectSymbol('|', PR_FALSE)) {  // namespace
      PRInt32 nameSpaceID = GetNamespaceIdForPrefix(holdIdent);
      if (nameSpaceID == kNameSpaceID_Unknown) {
        return PR_FALSE;
      }
      attr.AppendInt(nameSpaceID, 10);
      attr.Append(PRUnichar('|'));
      if (! GetToken(PR_FALSE)) {
        REPORT_UNEXPECTED_EOF(PEAttributeNameEOF);
        return PR_FALSE;
      }
      if (eCSSToken_Ident == mToken.mType) {
        attr.Append(mToken.mIdent);
      }
      else {
        REPORT_UNEXPECTED_TOKEN(PEAttributeNameExpected);
        UngetToken();
        return PR_FALSE;
      }
    }
    else {  // no namespace
      attr = holdIdent;
    }
  }
  else if (mToken.IsSymbol('*')) {  // namespace wildcard
    // Wildcard namespace makes no sense here and is not allowed
    REPORT_UNEXPECTED_TOKEN(PEAttributeNameExpected);
    UngetToken();
    return PR_FALSE;
  }
  else if (mToken.IsSymbol('|')) {  // explicit NO namespace
    if (! GetToken(PR_FALSE)) {
      REPORT_UNEXPECTED_EOF(PEAttributeNameEOF);
      return PR_FALSE;
    }
    if (eCSSToken_Ident == mToken.mType) {
      attr.Append(mToken.mIdent);
    }
    else {
      REPORT_UNEXPECTED_TOKEN(PEAttributeNameExpected);
      UngetToken();
      return PR_FALSE;
    }
  }
  else {
    REPORT_UNEXPECTED_TOKEN(PEAttributeNameOrNamespaceExpected);
    UngetToken();
    return PR_FALSE;
  }
  if (!ExpectSymbol(')', PR_TRUE)) {
    return PR_FALSE;
  }
  aValue.SetStringValue(attr, eCSSUnit_Attr);
  return PR_TRUE;
}

PRBool
CSSParserImpl::SetValueToURL(nsCSSValue& aValue, const nsString& aURL)
{
  if (!mSheetPrincipal) {
    NS_NOTREACHED("Codepaths that expect to parse URLs MUST pass in an "
                  "origin principal");
    return PR_FALSE;
  }

  // Translate url into an absolute url if the url is relative to the
  // style sheet.
  nsCOMPtr<nsIURI> uri;
  NS_NewURI(getter_AddRefs(uri), aURL, nsnull, mBaseURI);

  nsRefPtr<nsStringBuffer> buffer(nsCSSValue::BufferFromString(aURL));
  if (NS_UNLIKELY(!buffer)) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  // Note: urlVal retains its own reference to |buffer|.
  nsCSSValue::URL *urlVal =
    new nsCSSValue::URL(uri, buffer, mSheetURI, mSheetPrincipal);

  if (NS_UNLIKELY(!urlVal)) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }
  aValue.SetURLValue(urlVal);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseURL(nsCSSValue& aValue)
{
  nsAutoString url;
  if (!GetURLInParens(url))
    return PR_FALSE;

  return SetValueToURL(aValue, url);
}

/**
 * Parse the arguments of -moz-image-rect() function.
 * -moz-image-rect(<uri>, <top>, <right>, <bottom>, <left>)
 */
PRBool
CSSParserImpl::ParseImageRect(nsCSSValue& aImage)
{
  // A non-iterative for loop to break out when an error occurs.
  for (;;) {
    nsCSSValue newFunction;
    static const PRUint32 kNumArgs = 5;
    nsCSSValue::Array* func =
      newFunction.InitFunction(eCSSKeyword__moz_image_rect, kNumArgs);
    if (!func) {
      mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
      break;
    }

    // func->Item(0) is reserved for the function name.
    nsCSSValue& url    = func->Item(1);
    nsCSSValue& top    = func->Item(2);
    nsCSSValue& right  = func->Item(3);
    nsCSSValue& bottom = func->Item(4);
    nsCSSValue& left   = func->Item(5);

    if (!GetToken(PR_TRUE))
      break;
    if (mToken.mType == eCSSToken_String) {
      if (!SetValueToURL(url, mToken.mIdent))
        break;
    } else if (mToken.mType == eCSSToken_Function &&
               mToken.mIdent.LowerCaseEqualsLiteral("url")) {
      if (!ParseURL(url))
        break;
    } else {
      UngetToken();
      break;
    }
    if (!ExpectSymbol(',', PR_TRUE))
      break;

    static const PRInt32 VARIANT_SIDE = VARIANT_NUMBER | VARIANT_PERCENT;
    if (!ParseNonNegativeVariant(top, VARIANT_SIDE, nsnull) ||
        !ExpectSymbol(',', PR_TRUE) ||
        !ParseNonNegativeVariant(right, VARIANT_SIDE, nsnull) ||
        !ExpectSymbol(',', PR_TRUE) ||
        !ParseNonNegativeVariant(bottom, VARIANT_SIDE, nsnull) ||
        !ExpectSymbol(',', PR_TRUE) ||
        !ParseNonNegativeVariant(left, VARIANT_SIDE, nsnull) ||
        !ExpectSymbol(')', PR_TRUE))
      break;

    aImage = newFunction;
    return PR_TRUE;
  }

  SkipUntil(')');
  return PR_FALSE;
}

// <element>: -moz-element(# <element_id> )
PRBool
CSSParserImpl::ParseElement(nsCSSValue& aValue)
{
  // A non-iterative for loop to break out when an error occurs.
  for (;;) {
    if (!GetToken(PR_TRUE))
      break;

    if (mToken.mType == eCSSToken_ID) {
      aValue.SetStringValue(mToken.mIdent, eCSSUnit_Element);
    } else {
      UngetToken();
      break;
    }

    if (!ExpectSymbol(')', PR_TRUE))
      break;

    return PR_TRUE;
  }

  // If we detect a syntax error, we must match the opening parenthesis of the
  // function with the closing parenthesis and skip all the tokens in between.
  SkipUntil(')');
  return PR_FALSE;
}

// <color-stop> : <color> [ <percentage> | <length> ]?
PRBool
CSSParserImpl::ParseColorStop(nsCSSValueGradient* aGradient)
{
  nsCSSValueGradientStop* stop = aGradient->mStops.AppendElement();
  if (!stop) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  if (!ParseVariant(stop->mColor, VARIANT_COLOR, nsnull)) {
    return PR_FALSE;
  }

  // Stop positions do not have to fall between the starting-point and
  // ending-point, so we don't use ParseNonNegativeVariant.
  if (!ParseVariant(stop->mLocation, VARIANT_LP, nsnull)) {
    stop->mLocation.SetNoneValue();
  }
  return PR_TRUE;
}

// <gradient>
//    : linear-gradient( <gradient-line>? <color-stops> ')'
//    : radial-gradient( <gradient-line>? <gradient-shape-size>?
//                       <color-stops> ')'
//
// <gradient-line> : [<bg-position> || <angle>] ,
//
// <gradient-shape-size> : [<gradient-shape> || <gradient-size>] ,
// <gradient-shape> : circle | ellipse
// <gradient-size> : closest-side | closest-corner
//                 | farthest-side | farthest-corner
//                 | contain | cover
//
// <color-stops> : <color-stop> , <color-stop> [, <color-stop>]*


PRBool
CSSParserImpl::ParseGradient(nsCSSValue& aValue, PRBool aIsRadial,
                             PRBool aIsRepeating)
{
  nsRefPtr<nsCSSValueGradient> cssGradient
    = new nsCSSValueGradient(aIsRadial, aIsRepeating);

  // <gradient-line>
  // N.B. ParseBoxPositionValues is not guaranteed to put back
  // everything it scanned if it fails, so we must only call it
  // if there is no alternative to consuming a <box-position>.
  // ParseVariant, as used here, will either succeed and consume
  // a single token, or fail and consume none, so we can be more
  // cavalier about calling it.

  if (!GetToken(PR_TRUE)) {
    return PR_FALSE;
  }
  nsCSSTokenType ty = mToken.mType;
  nsString id = mToken.mIdent;
  UngetToken();

  PRBool haveGradientLine = PR_FALSE;
  switch (ty) {
  case eCSSToken_Percentage:
  case eCSSToken_Number:
  case eCSSToken_Dimension:
    haveGradientLine = PR_TRUE;
    break;

  case eCSSToken_Function:
    if (id.LowerCaseEqualsLiteral("-moz-calc")) {
      haveGradientLine = PR_TRUE;
      break;
    }
    // fall through
  case eCSSToken_ID:
  case eCSSToken_Ref:
    // this is a color
    break;

  case eCSSToken_Ident: {
    // This is only a gradient line if it's a box position keyword.
    nsCSSKeyword kw = nsCSSKeywords::LookupKeyword(id);
    PRInt32 junk;
    if (kw != eCSSKeyword_UNKNOWN &&
        nsCSSProps::FindKeyword(kw, nsCSSProps::kBackgroundPositionKTable,
                                junk)) {
      haveGradientLine = PR_TRUE;
    }
    break;
  }

  default:
    // error
    SkipUntil(')');
    return PR_FALSE;
  }

  if (haveGradientLine) {
    PRBool haveAngle =
      ParseVariant(cssGradient->mAngle, VARIANT_ANGLE, nsnull);

    // if we got an angle, we might now have a comma, ending the gradient-line
    if (!haveAngle || !ExpectSymbol(',', PR_TRUE)) {
      if (!ParseBoxPositionValues(cssGradient->mBgPos, PR_FALSE)) {
        SkipUntil(')');
        return PR_FALSE;
      }

      if (!ExpectSymbol(',', PR_TRUE) &&
          // if we didn't already get an angle, we might have one now,
          // otherwise it's an error
          (haveAngle ||
           !ParseVariant(cssGradient->mAngle, VARIANT_ANGLE, nsnull) ||
           // now we better have a comma
           !ExpectSymbol(',', PR_TRUE))) {
        SkipUntil(')');
        return PR_FALSE;
      }
    }
  }

  // radial gradients might have a <gradient-shape-size> here
  if (aIsRadial) {
    PRBool haveShape =
      ParseVariant(cssGradient->mRadialShape, VARIANT_KEYWORD,
                   nsCSSProps::kRadialGradientShapeKTable);
    PRBool haveSize =
      ParseVariant(cssGradient->mRadialSize, VARIANT_KEYWORD,
                   nsCSSProps::kRadialGradientSizeKTable);

    // could be in either order
    if (!haveShape) {
      haveShape =
        ParseVariant(cssGradient->mRadialShape, VARIANT_KEYWORD,
                     nsCSSProps::kRadialGradientShapeKTable);
    }
    if ((haveShape || haveSize) && !ExpectSymbol(',', PR_TRUE)) {
      SkipUntil(')');
      return PR_FALSE;
    }
  }

  // At least two color stops are required
  if (!ParseColorStop(cssGradient) ||
      !ExpectSymbol(',', PR_TRUE) ||
      !ParseColorStop(cssGradient)) {
    SkipUntil(')');
    return PR_FALSE;
  }

  // Additional color stops
  while (ExpectSymbol(',', PR_TRUE)) {
    if (!ParseColorStop(cssGradient)) {
      SkipUntil(')');
      return PR_FALSE;
    }
  }

  if (!ExpectSymbol(')', PR_TRUE)) {
    SkipUntil(')');
    return PR_FALSE;
  }

  aValue.SetGradientValue(cssGradient);
  return PR_TRUE;
}

PRInt32
CSSParserImpl::ParseChoice(nsCSSValue aValues[],
                           const nsCSSProperty aPropIDs[], PRInt32 aNumIDs)
{
  PRInt32 found = 0;
  nsAutoParseCompoundProperty compound(this);

  PRInt32 loop;
  for (loop = 0; loop < aNumIDs; loop++) {
    // Try each property parser in order
    PRInt32 hadFound = found;
    PRInt32 index;
    for (index = 0; index < aNumIDs; index++) {
      PRInt32 bit = 1 << index;
      if ((found & bit) == 0) {
        if (ParseSingleValueProperty(aValues[index], aPropIDs[index])) {
          found |= bit;
          // It's more efficient to break since it will reset |hadFound|
          // to |found|.  Furthermore, ParseListStyle depends on our going
          // through the properties in order for each value..
          break;
        }
      }
    }
    if (found == hadFound) {  // found nothing new
      break;
    }
  }
  if (0 < found) {
    if (1 == found) { // only first property
      if (eCSSUnit_Inherit == aValues[0].GetUnit()) { // one inherit, all inherit
        for (loop = 1; loop < aNumIDs; loop++) {
          aValues[loop].SetInheritValue();
        }
        found = ((1 << aNumIDs) - 1);
      }
      else if (eCSSUnit_Initial == aValues[0].GetUnit()) { // one initial, all initial
        for (loop = 1; loop < aNumIDs; loop++) {
          aValues[loop].SetInitialValue();
        }
        found = ((1 << aNumIDs) - 1);
      }
    }
    else {  // more than one value, verify no inherits or initials
      for (loop = 0; loop < aNumIDs; loop++) {
        if (eCSSUnit_Inherit == aValues[loop].GetUnit()) {
          found = -1;
          break;
        }
        else if (eCSSUnit_Initial == aValues[loop].GetUnit()) {
          found = -1;
          break;
        }
      }
    }
  }
  return found;
}

void
CSSParserImpl::AppendValue(nsCSSProperty aPropID, const nsCSSValue& aValue)
{
  mTempData.AddLonghandProperty(aPropID, aValue);
}

/**
 * Parse a "box" property. Box properties have 1 to 4 values. When less
 * than 4 values are provided a standard mapping is used to replicate
 * existing values.
 */
PRBool
CSSParserImpl::ParseBoxProperties(const nsCSSProperty aPropIDs[])
{
  // Get up to four values for the property
  PRInt32 count = 0;
  nsCSSRect result;
  NS_FOR_CSS_SIDES (index) {
    if (! ParseSingleValueProperty(result.*(nsCSSRect::sides[index]),
                                   aPropIDs[index])) {
      break;
    }
    count++;
  }
  if ((count == 0) || (PR_FALSE == ExpectEndProperty())) {
    return PR_FALSE;
  }

  if (1 < count) { // verify no more than single inherit or initial
    NS_FOR_CSS_SIDES (index) {
      nsCSSUnit unit = (result.*(nsCSSRect::sides[index])).GetUnit();
      if (eCSSUnit_Inherit == unit || eCSSUnit_Initial == unit) {
        return PR_FALSE;
      }
    }
  }

  // Provide missing values by replicating some of the values found
  switch (count) {
    case 1: // Make right == top
      result.mRight = result.mTop;
    case 2: // Make bottom == top
      result.mBottom = result.mTop;
    case 3: // Make left == right
      result.mLeft = result.mRight;
  }

  NS_FOR_CSS_SIDES (index) {
    AppendValue(aPropIDs[index], result.*(nsCSSRect::sides[index]));
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseDirectionalBoxProperty(nsCSSProperty aProperty,
                                           PRInt32 aSourceType)
{
  const nsCSSProperty* subprops = nsCSSProps::SubpropertyEntryFor(aProperty);
  NS_ASSERTION(subprops[3] == eCSSProperty_UNKNOWN,
               "not box property with physical vs. logical cascading");
  nsCSSValue value;
  if (!ParseSingleValueProperty(value, subprops[0]) ||
      !ExpectEndProperty())
    return PR_FALSE;

  AppendValue(subprops[0], value);
  nsCSSValue typeVal(aSourceType, eCSSUnit_Enumerated);
  AppendValue(subprops[1], typeVal);
  AppendValue(subprops[2], typeVal);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseBoxCornerRadius(nsCSSProperty aPropID)
{
  nsCSSValue dimenX, dimenY;
  // required first value
  if (! ParseNonNegativeVariant(dimenX, VARIANT_HLP | VARIANT_CALC, nsnull))
    return PR_FALSE;

  // optional second value (forbidden if first value is inherit/initial)
  if (dimenX.GetUnit() != eCSSUnit_Inherit &&
      dimenX.GetUnit() != eCSSUnit_Initial) {
    ParseNonNegativeVariant(dimenY, VARIANT_LP | VARIANT_CALC, nsnull);
  }

  if (dimenX == dimenY || dimenY.GetUnit() == eCSSUnit_Null) {
    AppendValue(aPropID, dimenX);
  } else {
    nsCSSValue value;
    value.SetPairValue(dimenX, dimenY);
    AppendValue(aPropID, value);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseBoxCornerRadii(const nsCSSProperty aPropIDs[])
{
  // Rectangles are used as scratch storage.
  // top => top-left, right => top-right,
  // bottom => bottom-right, left => bottom-left.
  nsCSSRect dimenX, dimenY;
  PRInt32 countX = 0, countY = 0;

  NS_FOR_CSS_SIDES (side) {
    if (! ParseNonNegativeVariant(dimenX.*nsCSSRect::sides[side],
                                  (side > 0 ? 0 : VARIANT_INHERIT) |
                                    VARIANT_LP | VARIANT_CALC,
                                  nsnull))
      break;
    countX++;
  }
  if (countX == 0)
    return PR_FALSE;

  if (ExpectSymbol('/', PR_TRUE)) {
    NS_FOR_CSS_SIDES (side) {
      if (! ParseNonNegativeVariant(dimenY.*nsCSSRect::sides[side],
                                    VARIANT_LP | VARIANT_CALC, nsnull))
        break;
      countY++;
    }
    if (countY == 0)
      return PR_FALSE;
  }
  if (!ExpectEndProperty())
    return PR_FALSE;

  // if 'initial' or 'inherit' was used, it must be the only value
  if (countX > 1 || countY > 0) {
    nsCSSUnit unit = dimenX.mTop.GetUnit();
    if (eCSSUnit_Inherit == unit || eCSSUnit_Initial == unit)
      return PR_FALSE;
  }

  // if we have no Y-values, use the X-values
  if (countY == 0) {
    dimenY = dimenX;
    countY = countX;
  }

  // Provide missing values by replicating some of the values found
  switch (countX) {
    case 1: dimenX.mRight = dimenX.mTop;  // top-right same as top-left, and
    case 2: dimenX.mBottom = dimenX.mTop; // bottom-right same as top-left, and 
    case 3: dimenX.mLeft = dimenX.mRight; // bottom-left same as top-right
  }

  switch (countY) {
    case 1: dimenY.mRight = dimenY.mTop;  // top-right same as top-left, and
    case 2: dimenY.mBottom = dimenY.mTop; // bottom-right same as top-left, and 
    case 3: dimenY.mLeft = dimenY.mRight; // bottom-left same as top-right
  }

  NS_FOR_CSS_SIDES(side) {
    nsCSSValue& x = dimenX.*nsCSSRect::sides[side];
    nsCSSValue& y = dimenY.*nsCSSRect::sides[side];

    if (x == y) {
      AppendValue(aPropIDs[side], x);
    } else {
      nsCSSValue pair;
      pair.SetPairValue(x, y);
      AppendValue(aPropIDs[side], pair);
    }
  }
  return PR_TRUE;
}

// These must be in CSS order (top,right,bottom,left) for indexing to work
static const nsCSSProperty kBorderStyleIDs[] = {
  eCSSProperty_border_top_style,
  eCSSProperty_border_right_style_value,
  eCSSProperty_border_bottom_style,
  eCSSProperty_border_left_style_value
};
static const nsCSSProperty kBorderWidthIDs[] = {
  eCSSProperty_border_top_width,
  eCSSProperty_border_right_width_value,
  eCSSProperty_border_bottom_width,
  eCSSProperty_border_left_width_value
};
static const nsCSSProperty kBorderColorIDs[] = {
  eCSSProperty_border_top_color,
  eCSSProperty_border_right_color_value,
  eCSSProperty_border_bottom_color,
  eCSSProperty_border_left_color_value
};
static const nsCSSProperty kBorderRadiusIDs[] = {
  eCSSProperty_border_top_left_radius,
  eCSSProperty_border_top_right_radius,
  eCSSProperty_border_bottom_right_radius,
  eCSSProperty_border_bottom_left_radius
};
static const nsCSSProperty kOutlineRadiusIDs[] = {
  eCSSProperty__moz_outline_radius_topLeft,
  eCSSProperty__moz_outline_radius_topRight,
  eCSSProperty__moz_outline_radius_bottomRight,
  eCSSProperty__moz_outline_radius_bottomLeft
};

PRBool
CSSParserImpl::ParseProperty(nsCSSProperty aPropID)
{
  NS_ASSERTION(aPropID < eCSSProperty_COUNT, "index out of range");

  switch (aPropID) {  // handle shorthand or multiple properties
  case eCSSProperty_background:
    return ParseBackground();
  case eCSSProperty_background_position:
    return ParseBackgroundPosition();
  case eCSSProperty_background_attachment:
  case eCSSProperty_background_clip:
  case eCSSProperty_background_image:
  case eCSSProperty_background_origin:
  case eCSSProperty_background_repeat:
    return ParseBackgroundList(aPropID);
  case eCSSProperty_background_size:
    return ParseBackgroundSize();
  case eCSSProperty_border:
    return ParseBorderSide(kBorderTopIDs, PR_TRUE);
  case eCSSProperty_border_color:
    return ParseBorderColor();
  case eCSSProperty_border_spacing:
    return ParseBorderSpacing();
  case eCSSProperty_border_style:
    return ParseBorderStyle();
  case eCSSProperty_border_bottom:
    return ParseBorderSide(kBorderBottomIDs, PR_FALSE);
  case eCSSProperty_border_end:
    return ParseDirectionalBorderSide(kBorderEndIDs,
                                      NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_left:
    return ParseDirectionalBorderSide(kBorderLeftIDs,
                                      NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_right:
    return ParseDirectionalBorderSide(kBorderRightIDs,
                                      NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_start:
    return ParseDirectionalBorderSide(kBorderStartIDs,
                                      NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_top:
    return ParseBorderSide(kBorderTopIDs, PR_FALSE);
  case eCSSProperty_border_bottom_colors:
  case eCSSProperty_border_left_colors:
  case eCSSProperty_border_right_colors:
  case eCSSProperty_border_top_colors:
    return ParseBorderColors(aPropID);
  case eCSSProperty_border_image:
    return ParseBorderImage();
  case eCSSProperty_border_width:
    return ParseBorderWidth();
  case eCSSProperty_border_end_color:
    return ParseDirectionalBoxProperty(eCSSProperty_border_end_color,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_left_color:
    return ParseDirectionalBoxProperty(eCSSProperty_border_left_color,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_right_color:
    return ParseDirectionalBoxProperty(eCSSProperty_border_right_color,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_start_color:
    return ParseDirectionalBoxProperty(eCSSProperty_border_start_color,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_end_width:
    return ParseDirectionalBoxProperty(eCSSProperty_border_end_width,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_left_width:
    return ParseDirectionalBoxProperty(eCSSProperty_border_left_width,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_right_width:
    return ParseDirectionalBoxProperty(eCSSProperty_border_right_width,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_start_width:
    return ParseDirectionalBoxProperty(eCSSProperty_border_start_width,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_end_style:
    return ParseDirectionalBoxProperty(eCSSProperty_border_end_style,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_left_style:
    return ParseDirectionalBoxProperty(eCSSProperty_border_left_style,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_right_style:
    return ParseDirectionalBoxProperty(eCSSProperty_border_right_style,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_border_start_style:
    return ParseDirectionalBoxProperty(eCSSProperty_border_start_style,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_border_radius:
    return ParseBoxCornerRadii(kBorderRadiusIDs);
  case eCSSProperty__moz_outline_radius:
    return ParseBoxCornerRadii(kOutlineRadiusIDs);

  case eCSSProperty_border_top_left_radius:
  case eCSSProperty_border_top_right_radius:
  case eCSSProperty_border_bottom_right_radius:
  case eCSSProperty_border_bottom_left_radius:
  case eCSSProperty__moz_outline_radius_topLeft:
  case eCSSProperty__moz_outline_radius_topRight:
  case eCSSProperty__moz_outline_radius_bottomRight:
  case eCSSProperty__moz_outline_radius_bottomLeft:
    return ParseBoxCornerRadius(aPropID);

  case eCSSProperty_box_shadow:
  case eCSSProperty_text_shadow:
    return ParseShadowList(aPropID);

  case eCSSProperty_clip:
    return ParseRect(eCSSProperty_clip);
  case eCSSProperty__moz_column_rule:
    return ParseBorderSide(kColumnRuleIDs, PR_FALSE);
  case eCSSProperty_content:
    return ParseContent();
  case eCSSProperty_counter_increment:
  case eCSSProperty_counter_reset:
    return ParseCounterData(aPropID);
  case eCSSProperty_cue:
    return ParseCue();
  case eCSSProperty_cursor:
    return ParseCursor();
  case eCSSProperty_font:
    return ParseFont();
  case eCSSProperty_image_region:
    return ParseRect(eCSSProperty_image_region);
  case eCSSProperty_list_style:
    return ParseListStyle();
  case eCSSProperty_margin:
    return ParseMargin();
  case eCSSProperty_margin_end:
    return ParseDirectionalBoxProperty(eCSSProperty_margin_end,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_margin_left:
    return ParseDirectionalBoxProperty(eCSSProperty_margin_left,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_margin_right:
    return ParseDirectionalBoxProperty(eCSSProperty_margin_right,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_margin_start:
    return ParseDirectionalBoxProperty(eCSSProperty_margin_start,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_outline:
    return ParseOutline();
  case eCSSProperty_overflow:
    return ParseOverflow();
  case eCSSProperty_padding:
    return ParsePadding();
  case eCSSProperty_padding_end:
    return ParseDirectionalBoxProperty(eCSSProperty_padding_end,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_padding_left:
    return ParseDirectionalBoxProperty(eCSSProperty_padding_left,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_padding_right:
    return ParseDirectionalBoxProperty(eCSSProperty_padding_right,
                                       NS_BOXPROP_SOURCE_PHYSICAL);
  case eCSSProperty_padding_start:
    return ParseDirectionalBoxProperty(eCSSProperty_padding_start,
                                       NS_BOXPROP_SOURCE_LOGICAL);
  case eCSSProperty_pause:
    return ParsePause();
  case eCSSProperty_quotes:
    return ParseQuotes();
  case eCSSProperty_size:
    return ParseSize();
  case eCSSProperty__moz_transform:
    return ParseMozTransform();
  case eCSSProperty__moz_transform_origin:
    return ParseMozTransformOrigin();
  case eCSSProperty_transition:
      return ParseTransition();
  case eCSSProperty_transition_property:
    return ParseTransitionProperty();
  case eCSSProperty_transition_timing_function:
    return ParseTransitionTimingFunction();
  case eCSSProperty_transition_duration:
  case eCSSProperty_transition_delay:
    return ParseTransitionTime(aPropID);

#ifdef MOZ_SVG
  case eCSSProperty_fill:
  case eCSSProperty_stroke:
    return ParsePaint(aPropID);
  case eCSSProperty_stroke_dasharray:
    return ParseDasharray();
  case eCSSProperty_marker:
    return ParseMarker();
#endif

  // Strip out properties we use internally.
  case eCSSProperty__x_system_font:
  case eCSSProperty_margin_end_value:
  case eCSSProperty_margin_left_value:
  case eCSSProperty_margin_right_value:
  case eCSSProperty_margin_start_value:
  case eCSSProperty_margin_left_ltr_source:
  case eCSSProperty_margin_left_rtl_source:
  case eCSSProperty_margin_right_ltr_source:
  case eCSSProperty_margin_right_rtl_source:
  case eCSSProperty_padding_end_value:
  case eCSSProperty_padding_left_value:
  case eCSSProperty_padding_right_value:
  case eCSSProperty_padding_start_value:
  case eCSSProperty_padding_left_ltr_source:
  case eCSSProperty_padding_left_rtl_source:
  case eCSSProperty_padding_right_ltr_source:
  case eCSSProperty_padding_right_rtl_source:
  case eCSSProperty_border_end_color_value:
  case eCSSProperty_border_left_color_value:
  case eCSSProperty_border_right_color_value:
  case eCSSProperty_border_start_color_value:
  case eCSSProperty_border_left_color_ltr_source:
  case eCSSProperty_border_left_color_rtl_source:
  case eCSSProperty_border_right_color_ltr_source:
  case eCSSProperty_border_right_color_rtl_source:
  case eCSSProperty_border_end_style_value:
  case eCSSProperty_border_left_style_value:
  case eCSSProperty_border_right_style_value:
  case eCSSProperty_border_start_style_value:
  case eCSSProperty_border_left_style_ltr_source:
  case eCSSProperty_border_left_style_rtl_source:
  case eCSSProperty_border_right_style_ltr_source:
  case eCSSProperty_border_right_style_rtl_source:
  case eCSSProperty_border_end_width_value:
  case eCSSProperty_border_left_width_value:
  case eCSSProperty_border_right_width_value:
  case eCSSProperty_border_start_width_value:
  case eCSSProperty_border_left_width_ltr_source:
  case eCSSProperty_border_left_width_rtl_source:
  case eCSSProperty_border_right_width_ltr_source:
  case eCSSProperty_border_right_width_rtl_source:
    // The user can't use these
    REPORT_UNEXPECTED(PEInaccessibleProperty2);
    return PR_FALSE;
  default:  // must be single property
    {
      nsCSSValue value;
      if (ParseSingleValueProperty(value, aPropID)) {
        if (ExpectEndProperty()) {
          AppendValue(aPropID, value);
          return PR_TRUE;
        }
        // XXX Report errors?
      }
      // XXX Report errors?
    }
  }
  return PR_FALSE;
}

// Bits used in determining which background position info we have
#define BG_CENTER  NS_STYLE_BG_POSITION_CENTER
#define BG_TOP     NS_STYLE_BG_POSITION_TOP
#define BG_BOTTOM  NS_STYLE_BG_POSITION_BOTTOM
#define BG_LEFT    NS_STYLE_BG_POSITION_LEFT
#define BG_RIGHT   NS_STYLE_BG_POSITION_RIGHT
#define BG_CTB    (BG_CENTER | BG_TOP | BG_BOTTOM)
#define BG_CLR    (BG_CENTER | BG_LEFT | BG_RIGHT)

PRBool
CSSParserImpl::ParseSingleValueProperty(nsCSSValue& aValue,
                                        nsCSSProperty aPropID)
{
  switch (aPropID) {
  case eCSSProperty_UNKNOWN:
  case eCSSProperty_background:
  case eCSSProperty_background_position:
  case eCSSProperty_border:
  case eCSSProperty_border_color:
  case eCSSProperty_border_bottom_colors:
  case eCSSProperty_border_image:
  case eCSSProperty_border_left_colors:
  case eCSSProperty_border_right_colors:
  case eCSSProperty_border_end_color:
  case eCSSProperty_border_left_color:
  case eCSSProperty_border_right_color:
  case eCSSProperty_border_start_color:
  case eCSSProperty_border_end_style:
  case eCSSProperty_border_left_style:
  case eCSSProperty_border_right_style:
  case eCSSProperty_border_start_style:
  case eCSSProperty_border_end_width:
  case eCSSProperty_border_left_width:
  case eCSSProperty_border_right_width:
  case eCSSProperty_border_start_width:
  case eCSSProperty_border_top_colors:
  case eCSSProperty_border_spacing:
  case eCSSProperty_border_style:
  case eCSSProperty_border_bottom:
  case eCSSProperty_border_end:
  case eCSSProperty_border_left:
  case eCSSProperty_border_right:
  case eCSSProperty_border_start:
  case eCSSProperty_border_top:
  case eCSSProperty_border_width:
  case eCSSProperty_background_size:
  case eCSSProperty_border_radius:
  case eCSSProperty_border_top_left_radius:
  case eCSSProperty_border_top_right_radius:
  case eCSSProperty_border_bottom_right_radius:
  case eCSSProperty_border_bottom_left_radius:
  case eCSSProperty_box_shadow:
  case eCSSProperty_clip:
  case eCSSProperty__moz_column_rule:
  case eCSSProperty_content:
  case eCSSProperty_counter_increment:
  case eCSSProperty_counter_reset:
  case eCSSProperty_cue:
  case eCSSProperty_cursor:
  case eCSSProperty_font:
  case eCSSProperty_image_region:
  case eCSSProperty_list_style:
  case eCSSProperty_margin:
  case eCSSProperty_margin_end:
  case eCSSProperty_margin_left:
  case eCSSProperty_margin_right:
  case eCSSProperty_margin_start:
  case eCSSProperty_outline:
  case eCSSProperty__moz_outline_radius:
  case eCSSProperty__moz_outline_radius_topLeft:
  case eCSSProperty__moz_outline_radius_topRight:
  case eCSSProperty__moz_outline_radius_bottomRight:
  case eCSSProperty__moz_outline_radius_bottomLeft:
  case eCSSProperty_overflow:
  case eCSSProperty_padding:
  case eCSSProperty_padding_end:
  case eCSSProperty_padding_left:
  case eCSSProperty_padding_right:
  case eCSSProperty_padding_start:
  case eCSSProperty_pause:
  case eCSSProperty_quotes:
  case eCSSProperty_size:
  case eCSSProperty_text_shadow:
  case eCSSProperty__moz_transform:
  case eCSSProperty__moz_transform_origin:
  case eCSSProperty_transition:
  case eCSSProperty_transition_property:
  case eCSSProperty_transition_timing_function:
  case eCSSProperty_transition_duration:
  case eCSSProperty_transition_delay:
  case eCSSProperty_COUNT:
#ifdef MOZ_SVG
  case eCSSProperty_fill:
  case eCSSProperty_stroke:
  case eCSSProperty_stroke_dasharray:
  case eCSSProperty_marker:
#endif
  case eCSSPropertyExtra_no_properties:
  case eCSSPropertyExtra_all_properties:
    NS_ERROR("not a single value property");
    return PR_FALSE;

  case eCSSProperty__x_system_font:
  case eCSSProperty_margin_left_ltr_source:
  case eCSSProperty_margin_left_rtl_source:
  case eCSSProperty_margin_right_ltr_source:
  case eCSSProperty_margin_right_rtl_source:
  case eCSSProperty_padding_left_ltr_source:
  case eCSSProperty_padding_left_rtl_source:
  case eCSSProperty_padding_right_ltr_source:
  case eCSSProperty_padding_right_rtl_source:
  case eCSSProperty_border_left_color_ltr_source:
  case eCSSProperty_border_left_color_rtl_source:
  case eCSSProperty_border_right_color_ltr_source:
  case eCSSProperty_border_right_color_rtl_source:
  case eCSSProperty_border_left_style_ltr_source:
  case eCSSProperty_border_left_style_rtl_source:
  case eCSSProperty_border_right_style_ltr_source:
  case eCSSProperty_border_right_style_rtl_source:
  case eCSSProperty_border_left_width_ltr_source:
  case eCSSProperty_border_left_width_rtl_source:
  case eCSSProperty_border_right_width_ltr_source:
  case eCSSProperty_border_right_width_rtl_source:
#ifdef MOZ_MATHML
  case eCSSProperty_script_size_multiplier:
  case eCSSProperty_script_min_size:
#endif
    NS_ERROR("not currently parsed here");
    return PR_FALSE;

  case eCSSProperty_appearance:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kAppearanceKTable);
  case eCSSProperty_azimuth:
    return ParseAzimuth(aValue);
  case eCSSProperty_background_attachment:
    // Used only internally.
    return ParseVariant(aValue, VARIANT_KEYWORD,
                        nsCSSProps::kBackgroundAttachmentKTable);
  case eCSSProperty_background_clip:
    // Used only internally.
    return ParseVariant(aValue, VARIANT_KEYWORD,
                        nsCSSProps::kBackgroundOriginKTable);
  case eCSSProperty_background_color:
    return ParseVariant(aValue, VARIANT_HC, nsnull);
  case eCSSProperty_background_image:
    // Used only internally.
    return ParseVariant(aValue, VARIANT_IMAGE, nsnull);
  case eCSSProperty__moz_background_inline_policy:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBackgroundInlinePolicyKTable);
  case eCSSProperty_background_origin:
    // Used only internally.
    return ParseVariant(aValue, VARIANT_KEYWORD,
                        nsCSSProps::kBackgroundOriginKTable);
  case eCSSProperty_background_repeat:
    // Used only internally.
    return ParseVariant(aValue, VARIANT_KEYWORD,
                        nsCSSProps::kBackgroundRepeatKTable);
  case eCSSProperty_binding:
    return ParseVariant(aValue, VARIANT_HUO, nsnull);
  case eCSSProperty_border_collapse:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBorderCollapseKTable);
  case eCSSProperty_border_bottom_color:
  case eCSSProperty_border_end_color_value: // for internal use
  case eCSSProperty_border_left_color_value: // for internal use
  case eCSSProperty_border_right_color_value: // for internal use
  case eCSSProperty_border_start_color_value: // for internal use
  case eCSSProperty_border_top_color:
  case eCSSProperty__moz_column_rule_color:
    return ParseVariant(aValue, VARIANT_HCK,
                        nsCSSProps::kBorderColorKTable);
  case eCSSProperty_border_bottom_style:
  case eCSSProperty_border_end_style_value: // for internal use
  case eCSSProperty_border_left_style_value: // for internal use
  case eCSSProperty_border_right_style_value: // for internal use
  case eCSSProperty_border_start_style_value: // for internal use
  case eCSSProperty_border_top_style:
  case eCSSProperty__moz_column_rule_style:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBorderStyleKTable);
  case eCSSProperty_border_bottom_width:
  case eCSSProperty_border_end_width_value: // for internal use
  case eCSSProperty_border_left_width_value: // for internal use
  case eCSSProperty_border_right_width_value: // for internal use
  case eCSSProperty_border_start_width_value: // for internal use
  case eCSSProperty_border_top_width:
  case eCSSProperty__moz_column_rule_width:
    return ParseNonNegativeVariant(aValue, VARIANT_HKL | VARIANT_CALC,
                                   nsCSSProps::kBorderWidthKTable);
  case eCSSProperty__moz_column_count:
    // Need to reject 0 in addition to negatives.  If we accept 0, we
    // need to change NS_STYLE_COLUMN_COUNT_AUTO to something else.
    return ParsePositiveNonZeroVariant(aValue, VARIANT_AHI, nsnull);
  case eCSSProperty__moz_column_width:
    return ParseNonNegativeVariant(aValue, VARIANT_AHL | VARIANT_CALC, nsnull);
  case eCSSProperty__moz_column_gap:
    return ParseNonNegativeVariant(aValue, VARIANT_HL | VARIANT_NORMAL |
                                   VARIANT_CALC, nsnull);
  case eCSSProperty_bottom:
  case eCSSProperty_top:
  case eCSSProperty_left:
  case eCSSProperty_right:
    return ParseVariant(aValue, VARIANT_AHLP | VARIANT_CALC, nsnull);
  case eCSSProperty_box_align:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBoxAlignKTable);
  case eCSSProperty_box_direction:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBoxDirectionKTable);
  case eCSSProperty_box_flex:
    return ParseNonNegativeVariant(aValue, VARIANT_HN, nsnull);
  case eCSSProperty_box_orient:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBoxOrientKTable);
  case eCSSProperty_box_pack:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBoxPackKTable);
  case eCSSProperty_box_ordinal_group:
    return ParseNonNegativeVariant(aValue, VARIANT_HI, nsnull);
#ifdef MOZ_SVG
  case eCSSProperty_clip_path:
    return ParseVariant(aValue, VARIANT_HUO, nsnull);
  case eCSSProperty_clip_rule:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kFillRuleKTable);
  case eCSSProperty_color_interpolation:
  case eCSSProperty_color_interpolation_filters:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kColorInterpolationKTable);
  case eCSSProperty_dominant_baseline:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kDominantBaselineKTable);
  case eCSSProperty_fill_opacity:
    return ParseVariant(aValue, VARIANT_HN,
                        nsnull);
  case eCSSProperty_fill_rule:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kFillRuleKTable);
  case eCSSProperty_filter:
    return ParseVariant(aValue, VARIANT_HUO, nsnull);
  case eCSSProperty_flood_color:
    return ParseVariant(aValue, VARIANT_HC, nsnull);
  case eCSSProperty_flood_opacity:
    return ParseVariant(aValue, VARIANT_HN, nsnull);
  case eCSSProperty_image_rendering:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kImageRenderingKTable);
  case eCSSProperty_lighting_color:
    return ParseVariant(aValue, VARIANT_HC, nsnull);
  case eCSSProperty_marker_end:
  case eCSSProperty_marker_mid:
  case eCSSProperty_marker_start:
    return ParseVariant(aValue, VARIANT_HUO, nsnull);
  case eCSSProperty_mask:
    return ParseVariant(aValue, VARIANT_HUO, nsnull);
  case eCSSProperty_shape_rendering:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kShapeRenderingKTable);
  case eCSSProperty_stop_color:
    return ParseVariant(aValue, VARIANT_HC,
                        nsnull);
  case eCSSProperty_stop_opacity:
    return ParseVariant(aValue, VARIANT_HN,
                        nsnull);
  case eCSSProperty_stroke_dashoffset:
    return ParseVariant(aValue, VARIANT_HLPN,
                        nsnull);
  case eCSSProperty_stroke_linecap:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kStrokeLinecapKTable);
  case eCSSProperty_stroke_linejoin:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kStrokeLinejoinKTable);
  case eCSSProperty_stroke_miterlimit:
    return ParseVariant(aValue, VARIANT_HN, nsnull) &&
           // Enforce the restriction that the value is greater than 1.
           (aValue.GetUnit() != eCSSUnit_Number || 
            aValue.GetFloatValue() >= 1.0f);
  case eCSSProperty_stroke_opacity:
    return ParseVariant(aValue, VARIANT_HN,
                        nsnull);
  case eCSSProperty_stroke_width:
    return ParseNonNegativeVariant(aValue, VARIANT_HLPN, nsnull);
  case eCSSProperty_text_anchor:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kTextAnchorKTable);
  case eCSSProperty_text_rendering:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kTextRenderingKTable);
#endif
  case eCSSProperty_box_sizing:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kBoxSizingKTable);
  case eCSSProperty_height:
    return ParseNonNegativeVariant(aValue, VARIANT_AHLP | VARIANT_CALC,
                                   nsnull);
  case eCSSProperty_width:
    return ParseNonNegativeVariant(aValue, VARIANT_AHKLP | VARIANT_CALC,
                                   nsCSSProps::kWidthKTable);
  case eCSSProperty_force_broken_image_icon:
    return ParseNonNegativeVariant(aValue, VARIANT_HI, nsnull);
  case eCSSProperty_caption_side:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kCaptionSideKTable);
  case eCSSProperty_clear:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kClearKTable);
  case eCSSProperty_color:
    return ParseVariant(aValue, VARIANT_HC, nsnull);
  case eCSSProperty_cue_after:
  case eCSSProperty_cue_before:
    return ParseVariant(aValue, VARIANT_HUO, nsnull);
  case eCSSProperty_direction:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kDirectionKTable);
  case eCSSProperty_display:
    if (ParseVariant(aValue, VARIANT_HK, nsCSSProps::kDisplayKTable)) {
      if (aValue.GetUnit() == eCSSUnit_Enumerated) {
        switch (aValue.GetIntValue()) {
          case NS_STYLE_DISPLAY_MARKER:        // bug 2055
          case NS_STYLE_DISPLAY_RUN_IN:        // bug 2056
          case NS_STYLE_DISPLAY_COMPACT:       // bug 14983
            return PR_FALSE;
        }
      }
      return PR_TRUE;
    }
    return PR_FALSE;
  case eCSSProperty_elevation:
    return ParseVariant(aValue, VARIANT_HK | VARIANT_ANGLE,
                        nsCSSProps::kElevationKTable);
  case eCSSProperty_empty_cells:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kEmptyCellsKTable);
  case eCSSProperty_float:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kFloatKTable);
  case eCSSProperty_float_edge:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kFloatEdgeKTable);
  case eCSSProperty_font_family:
    return ParseFamily(aValue);
  case eCSSProperty_font_feature_settings:
  case eCSSProperty_font_language_override:
    return ParseVariant(aValue, VARIANT_NORMAL | VARIANT_INHERIT |
                                VARIANT_STRING, nsnull);
  case eCSSProperty_font_size:
    return ParseNonNegativeVariant(aValue,
                                   VARIANT_HKLP | VARIANT_SYSFONT |
                                     VARIANT_CALC,
                                   nsCSSProps::kFontSizeKTable);
  case eCSSProperty_font_size_adjust:
    return ParseVariant(aValue, VARIANT_HON | VARIANT_SYSFONT,
                        nsnull);
  case eCSSProperty_font_stretch:
    return ParseVariant(aValue, VARIANT_HK | VARIANT_SYSFONT,
                        nsCSSProps::kFontStretchKTable);
  case eCSSProperty_font_style:
    return ParseVariant(aValue, VARIANT_HK | VARIANT_SYSFONT,
                        nsCSSProps::kFontStyleKTable);
  case eCSSProperty_font_variant:
    return ParseVariant(aValue, VARIANT_HK | VARIANT_SYSFONT,
                        nsCSSProps::kFontVariantKTable);
  case eCSSProperty_font_weight:
    return ParseFontWeight(aValue);
  case eCSSProperty_ime_mode:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kIMEModeKTable);
  case eCSSProperty__moz_tab_size:
    return ParseNonNegativeVariant(aValue, VARIANT_HI, nsnull);
  case eCSSProperty_letter_spacing:
  case eCSSProperty_word_spacing:
    return ParseVariant(aValue, VARIANT_HL | VARIANT_NORMAL | VARIANT_CALC,
                        nsnull);
  case eCSSProperty_line_height:
    return ParseNonNegativeVariant(aValue, VARIANT_HLPN | VARIANT_KEYWORD | VARIANT_NORMAL | VARIANT_SYSFONT, nsCSSProps::kLineHeightKTable);
  case eCSSProperty_list_style_image:
    return ParseVariant(aValue, VARIANT_HUO, nsnull);
  case eCSSProperty_list_style_position:
    return ParseVariant(aValue, VARIANT_HK, nsCSSProps::kListStylePositionKTable);
  case eCSSProperty_list_style_type:
    return ParseVariant(aValue, VARIANT_HK, nsCSSProps::kListStyleKTable);
  case eCSSProperty_margin_bottom:
  case eCSSProperty_margin_end_value: // for internal use
  case eCSSProperty_margin_left_value: // for internal use
  case eCSSProperty_margin_right_value: // for internal use
  case eCSSProperty_margin_start_value: // for internal use
  case eCSSProperty_margin_top:
    return ParseVariant(aValue, VARIANT_AHLP | VARIANT_CALC, nsnull);
  case eCSSProperty_marker_offset:
    return ParseVariant(aValue, VARIANT_AHL | VARIANT_CALC, nsnull);
  case eCSSProperty_marks:
    return ParseMarks(aValue);
  case eCSSProperty_max_height:
    return ParseNonNegativeVariant(aValue, VARIANT_HLPO | VARIANT_CALC,
                                   nsnull);
  case eCSSProperty_max_width:
    return ParseNonNegativeVariant(aValue, VARIANT_HKLPO | VARIANT_CALC,
                                   nsCSSProps::kWidthKTable);
  case eCSSProperty_min_height:
    return ParseNonNegativeVariant(aValue, VARIANT_HLP | VARIANT_CALC,
                                   nsnull);
  case eCSSProperty_min_width:
    return ParseNonNegativeVariant(aValue, VARIANT_HKLP | VARIANT_CALC,
                                   nsCSSProps::kWidthKTable);
  case eCSSProperty_opacity:
    return ParseVariant(aValue, VARIANT_HN, nsnull);
  case eCSSProperty_orphans:
  case eCSSProperty_widows:
    return ParsePositiveNonZeroVariant(aValue, VARIANT_HI, nsnull);
  case eCSSProperty_outline_color:
    return ParseVariant(aValue, VARIANT_HCK,
                        nsCSSProps::kOutlineColorKTable);
  case eCSSProperty_outline_style:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kOutlineStyleKTable);
  case eCSSProperty_outline_width:
    return ParseNonNegativeVariant(aValue, VARIANT_HKL | VARIANT_CALC,
                                   nsCSSProps::kBorderWidthKTable);
  case eCSSProperty_outline_offset:
    return ParseVariant(aValue, VARIANT_HL | VARIANT_CALC, nsnull);
  case eCSSProperty_overflow_x:
  case eCSSProperty_overflow_y:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kOverflowSubKTable);
  case eCSSProperty_padding_bottom:
  case eCSSProperty_padding_end_value: // for internal use
  case eCSSProperty_padding_left_value: // for internal use
  case eCSSProperty_padding_right_value: // for internal use
  case eCSSProperty_padding_start_value: // for internal use
  case eCSSProperty_padding_top:
    return ParseNonNegativeVariant(aValue, VARIANT_HLP | VARIANT_CALC, nsnull);
  case eCSSProperty_page:
    return ParseVariant(aValue, VARIANT_AUTO | VARIANT_IDENTIFIER, nsnull);
  case eCSSProperty_page_break_after:
  case eCSSProperty_page_break_before:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kPageBreakKTable);
  case eCSSProperty_page_break_inside:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kPageBreakInsideKTable);
  case eCSSProperty_pause_after:
  case eCSSProperty_pause_before:
    return ParseVariant(aValue, VARIANT_HTP, nsnull);
  case eCSSProperty_pitch:
    return ParseVariant(aValue, VARIANT_HKF, nsCSSProps::kPitchKTable);
  case eCSSProperty_pitch_range:
    return ParseVariant(aValue, VARIANT_HN, nsnull);
  case eCSSProperty_pointer_events:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kPointerEventsKTable);
  case eCSSProperty_position:
    return ParseVariant(aValue, VARIANT_HK, nsCSSProps::kPositionKTable);
  case eCSSProperty_resize:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kResizeKTable);
  case eCSSProperty_richness:
    return ParseVariant(aValue, VARIANT_HN, nsnull);
#ifdef MOZ_MATHML
  // script-level can take Integer or Number values, but only Integer ("relative")
  // values can be specified in a style sheet. Also we only allow this property
  // when unsafe rules are enabled, because otherwise it could interfere
  // with rulenode optimizations if used in a non-MathML-enabled document.
  case eCSSProperty_script_level:
    if (!mUnsafeRulesEnabled)
      return PR_FALSE;
    return ParseVariant(aValue, VARIANT_HI, nsnull);
#endif
  case eCSSProperty_speak:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kSpeakKTable);
  case eCSSProperty_speak_header:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kSpeakHeaderKTable);
  case eCSSProperty_speak_numeral:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kSpeakNumeralKTable);
  case eCSSProperty_speak_punctuation:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kSpeakPunctuationKTable);
  case eCSSProperty_speech_rate:
    return ParseVariant(aValue, VARIANT_HN | VARIANT_KEYWORD,
                        nsCSSProps::kSpeechRateKTable);
  case eCSSProperty_stack_sizing:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kStackSizingKTable);
  case eCSSProperty_stress:
    return ParseVariant(aValue, VARIANT_HN, nsnull);
  case eCSSProperty_table_layout:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kTableLayoutKTable);
  case eCSSProperty_text_align:
    // When we support aligning on a string, we can parse text-align
    // as a string....
    return ParseVariant(aValue, VARIANT_HK /* | VARIANT_STRING */,
                        nsCSSProps::kTextAlignKTable);
  case eCSSProperty_text_decoration:
    return ParseTextDecoration(aValue);
  case eCSSProperty_text_indent:
    return ParseVariant(aValue, VARIANT_HLP | VARIANT_CALC, nsnull);
  case eCSSProperty_text_transform:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kTextTransformKTable);
  case eCSSProperty_unicode_bidi:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kUnicodeBidiKTable);
  case eCSSProperty_user_focus:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kUserFocusKTable);
  case eCSSProperty_user_input:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kUserInputKTable);
  case eCSSProperty_user_modify:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kUserModifyKTable);
  case eCSSProperty_user_select:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kUserSelectKTable);
  case eCSSProperty_vertical_align:
    return ParseVariant(aValue, VARIANT_HKLP | VARIANT_CALC,
                        nsCSSProps::kVerticalAlignKTable);
  case eCSSProperty_visibility:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kVisibilityKTable);
  case eCSSProperty_voice_family:
    return ParseFamily(aValue);
  case eCSSProperty_volume:
    return ParseVariant(aValue, VARIANT_HPN | VARIANT_KEYWORD,
                        nsCSSProps::kVolumeKTable);
  case eCSSProperty_white_space:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kWhitespaceKTable);
  case eCSSProperty__moz_window_shadow:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kWindowShadowKTable);
  case eCSSProperty_word_wrap:
    return ParseVariant(aValue, VARIANT_HK,
                        nsCSSProps::kWordwrapKTable);
  case eCSSProperty_z_index:
    return ParseVariant(aValue, VARIANT_AHI, nsnull);
  case eCSSPropertyExtra_x_none_value:
    return ParseVariant(aValue, VARIANT_NONE | VARIANT_INHERIT, nsnull);
  }
  // explicitly do NOT have a default case to let the compiler
  // help find missing properties
  return PR_FALSE;
}

// nsFont::EnumerateFamilies callback for ParseFontDescriptorValue
struct NS_STACK_CLASS ExtractFirstFamilyData {
  nsAutoString mFamilyName;
  PRBool mGood;
  ExtractFirstFamilyData() : mFamilyName(), mGood(PR_FALSE) {}
};

static PRBool
ExtractFirstFamily(const nsString& aFamily,
                   PRBool aGeneric,
                   void* aData)
{
  ExtractFirstFamilyData* realData = (ExtractFirstFamilyData*) aData;
  if (aGeneric || realData->mFamilyName.Length() > 0) {
    realData->mGood = PR_FALSE;
    return PR_FALSE;
  }
  realData->mFamilyName.Assign(aFamily);
  realData->mGood = PR_TRUE;
  return PR_TRUE;
}

// font-descriptor: descriptor ':' value ';'
// caller has advanced mToken to point at the descriptor
PRBool
CSSParserImpl::ParseFontDescriptorValue(nsCSSFontDesc aDescID,
                                        nsCSSValue& aValue)
{
  switch (aDescID) {
    // These four are similar to the properties of the same name,
    // possibly with more restrictions on the values they can take.
  case eCSSFontDesc_Family: {
    if (!ParseFamily(aValue) ||
        aValue.GetUnit() != eCSSUnit_Families)
      return PR_FALSE;

    // the style parameters to the nsFont constructor are ignored,
    // because it's only being used to call EnumerateFamilies
    nsAutoString valueStr;
    aValue.GetStringValue(valueStr);
    nsFont font(valueStr, 0, 0, 0, 0, 0, 0);
    ExtractFirstFamilyData dat;

    font.EnumerateFamilies(ExtractFirstFamily, (void*) &dat);
    if (!dat.mGood)
      return PR_FALSE;

    aValue.SetStringValue(dat.mFamilyName, eCSSUnit_String);
    return PR_TRUE;
  }

  case eCSSFontDesc_Style:
    // property is VARIANT_HMK|VARIANT_SYSFONT
    return ParseVariant(aValue, VARIANT_KEYWORD | VARIANT_NORMAL,
                        nsCSSProps::kFontStyleKTable);

  case eCSSFontDesc_Weight:
    return (ParseFontWeight(aValue) &&
            aValue.GetUnit() != eCSSUnit_Inherit &&
            aValue.GetUnit() != eCSSUnit_Initial &&
            (aValue.GetUnit() != eCSSUnit_Enumerated ||
             (aValue.GetIntValue() != NS_STYLE_FONT_WEIGHT_BOLDER &&
              aValue.GetIntValue() != NS_STYLE_FONT_WEIGHT_LIGHTER)));

  case eCSSFontDesc_Stretch:
    // property is VARIANT_HK|VARIANT_SYSFONT
    return ParseVariant(aValue, VARIANT_KEYWORD,
                        nsCSSProps::kFontStretchKTable);

    // These two are unique to @font-face and have their own special grammar.
  case eCSSFontDesc_Src:
    return ParseFontSrc(aValue);

  case eCSSFontDesc_UnicodeRange:
    return ParseFontRanges(aValue);

  case eCSSFontDesc_FontFeatureSettings:
  case eCSSFontDesc_FontLanguageOverride:
    return ParseVariant(aValue, VARIANT_NORMAL | VARIANT_STRING, nsnull);

  case eCSSFontDesc_UNKNOWN:
  case eCSSFontDesc_COUNT:
    NS_NOTREACHED("bad nsCSSFontDesc code");
  }
  // explicitly do NOT have a default case to let the compiler
  // help find missing descriptors
  return PR_FALSE;
}

void
CSSParserImpl::InitBoxPropsAsPhysical(const nsCSSProperty *aSourceProperties)
{
  nsCSSValue physical(NS_BOXPROP_SOURCE_PHYSICAL, eCSSUnit_Enumerated);
  for (const nsCSSProperty *prop = aSourceProperties;
       *prop != eCSSProperty_UNKNOWN; ++prop) {
    AppendValue(*prop, physical);
  }
}

PRBool
CSSParserImpl::ParseAzimuth(nsCSSValue& aValue)
{
  if (ParseVariant(aValue, VARIANT_HK | VARIANT_ANGLE,
                   nsCSSProps::kAzimuthKTable)) {
    if (eCSSUnit_Enumerated == aValue.GetUnit()) {
      PRInt32 intValue = aValue.GetIntValue();
      if ((NS_STYLE_AZIMUTH_LEFT_SIDE <= intValue) &&
          (intValue <= NS_STYLE_AZIMUTH_BEHIND)) {  // look for optional modifier
        nsCSSValue  modifier;
        if (ParseEnum(modifier, nsCSSProps::kAzimuthKTable)) {
          PRInt32 enumValue = modifier.GetIntValue();
          if (((intValue == NS_STYLE_AZIMUTH_BEHIND) &&
               (NS_STYLE_AZIMUTH_LEFT_SIDE <= enumValue) && (enumValue <= NS_STYLE_AZIMUTH_RIGHT_SIDE)) ||
              ((enumValue == NS_STYLE_AZIMUTH_BEHIND) &&
               (NS_STYLE_AZIMUTH_LEFT_SIDE <= intValue) && (intValue <= NS_STYLE_AZIMUTH_RIGHT_SIDE))) {
            aValue.SetIntValue(intValue | enumValue, eCSSUnit_Enumerated);
            return PR_TRUE;
          }
          // Put the unknown identifier back and return
          UngetToken();
          return PR_FALSE;
        }
      }
    }
    return PR_TRUE;
  }
  return PR_FALSE;
}

static nsCSSValue
BoxPositionMaskToCSSValue(PRInt32 aMask, PRBool isX)
{
  PRInt32 val = NS_STYLE_BG_POSITION_CENTER;
  if (isX) {
    if (aMask & BG_LEFT) {
      val = NS_STYLE_BG_POSITION_LEFT;
    }
    else if (aMask & BG_RIGHT) {
      val = NS_STYLE_BG_POSITION_RIGHT;
    }
  }
  else {
    if (aMask & BG_TOP) {
      val = NS_STYLE_BG_POSITION_TOP;
    }
    else if (aMask & BG_BOTTOM) {
      val = NS_STYLE_BG_POSITION_BOTTOM;
    }
  }

  return nsCSSValue(val, eCSSUnit_Enumerated);
}

PRBool
CSSParserImpl::ParseBackground()
{
  nsAutoParseCompoundProperty compound(this);

  // background-color can only be set once, so it's not a list.
  nsCSSValue color;

  // Check first for inherit/initial.
  if (ParseVariant(color, VARIANT_INHERIT, nsnull)) {
    // must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
    for (const nsCSSProperty* subprops =
           nsCSSProps::SubpropertyEntryFor(eCSSProperty_background);
         *subprops != eCSSProperty_UNKNOWN; ++subprops) {
      AppendValue(*subprops, color);
    }
    return PR_TRUE;
  }

  nsCSSValue image, repeat, attachment, clip, origin, position, size;
  BackgroundParseState state(color, image.SetListValue(), repeat.SetListValue(),
                             attachment.SetListValue(), clip.SetListValue(),
                             origin.SetListValue(), position.SetPairListValue(),
                             size.SetPairListValue());

  for (;;) {
    if (!ParseBackgroundItem(state)) {
      return PR_FALSE;
    }
    if (CheckEndProperty()) {
      break;
    }
    // If we saw a color, this must be the last item.
    if (color.GetUnit() != eCSSUnit_Null) {
      REPORT_UNEXPECTED_TOKEN(PEExpectEndValue);
      return PR_FALSE;
    }
    // Otherwise, a comma is mandatory.
    if (!ExpectSymbol(',', PR_TRUE)) {
      return PR_FALSE;
    }
    // Chain another entry on all the lists.
    state.mImage->mNext = new nsCSSValueList;
    state.mImage = state.mImage->mNext;
    state.mRepeat->mNext = new nsCSSValueList;
    state.mRepeat = state.mRepeat->mNext;
    state.mAttachment->mNext = new nsCSSValueList;
    state.mAttachment = state.mAttachment->mNext;
    state.mClip->mNext = new nsCSSValueList;
    state.mClip = state.mClip->mNext;
    state.mOrigin->mNext = new nsCSSValueList;
    state.mOrigin = state.mOrigin->mNext;
    state.mPosition->mNext = new nsCSSValuePairList;
    state.mPosition = state.mPosition->mNext;
    state.mSize->mNext = new nsCSSValuePairList;
    state.mSize = state.mSize->mNext;
  }

  // If we get to this point without seeing a color, provide a default.
  if (color.GetUnit() == eCSSUnit_Null) {
    color.SetColorValue(NS_RGBA(0,0,0,0));
  }

  AppendValue(eCSSProperty_background_image,      image);
  AppendValue(eCSSProperty_background_repeat,     repeat);
  AppendValue(eCSSProperty_background_attachment, attachment);
  AppendValue(eCSSProperty_background_clip,       clip);
  AppendValue(eCSSProperty_background_origin,     origin);
  AppendValue(eCSSProperty_background_position,   position);
  AppendValue(eCSSProperty_background_size,       size);
  AppendValue(eCSSProperty_background_color,      color);
  return PR_TRUE;
}

// Parse one item of the background shorthand property.
PRBool
CSSParserImpl::ParseBackgroundItem(CSSParserImpl::BackgroundParseState& aState)

{
  // Fill in the values that the shorthand will set if we don't find
  // other values.
  aState.mImage->mValue.SetNoneValue();
  aState.mRepeat->mValue.SetIntValue(NS_STYLE_BG_REPEAT_XY,
                                     eCSSUnit_Enumerated);
  aState.mAttachment->mValue.SetIntValue(NS_STYLE_BG_ATTACHMENT_SCROLL,
                                         eCSSUnit_Enumerated);
  aState.mClip->mValue.SetIntValue(NS_STYLE_BG_CLIP_BORDER,
                                   eCSSUnit_Enumerated);
  aState.mOrigin->mValue.SetIntValue(NS_STYLE_BG_ORIGIN_PADDING,
                                     eCSSUnit_Enumerated);
  aState.mPosition->mXValue.SetPercentValue(0.0f);
  aState.mPosition->mYValue.SetPercentValue(0.0f);
  aState.mSize->mXValue.SetAutoValue();
  aState.mSize->mYValue.SetAutoValue();

  PRBool haveColor = PR_FALSE,
         haveImage = PR_FALSE,
         haveRepeat = PR_FALSE,
         haveAttach = PR_FALSE,
         havePosition = PR_FALSE,
         haveOrigin = PR_FALSE,
         haveSomething = PR_FALSE;

  while (GetToken(PR_TRUE)) {
    nsCSSTokenType tt = mToken.mType;
    UngetToken(); // ...but we'll still cheat and use mToken
    if (tt == eCSSToken_Symbol) {
      // ExpectEndProperty only looks for symbols, and nothing else will
      // show up as one.
      break;
    }

    if (tt == eCSSToken_Ident) {
      nsCSSKeyword keyword = nsCSSKeywords::LookupKeyword(mToken.mIdent);
      PRInt32 dummy;
      if (keyword == eCSSKeyword_inherit ||
          keyword == eCSSKeyword__moz_initial) {
        return PR_FALSE;
      } else if (keyword == eCSSKeyword_none) {
        if (haveImage)
          return PR_FALSE;
        haveImage = PR_TRUE;
        if (!ParseSingleValueProperty(aState.mImage->mValue,
                                      eCSSProperty_background_image)) {
          NS_NOTREACHED("should be able to parse");
          return PR_FALSE;
        }
      } else if (nsCSSProps::FindKeyword(keyword,
                   nsCSSProps::kBackgroundAttachmentKTable, dummy)) {
        if (haveAttach)
          return PR_FALSE;
        haveAttach = PR_TRUE;
        if (!ParseSingleValueProperty(aState.mAttachment->mValue,
                                      eCSSProperty_background_attachment)) {
          NS_NOTREACHED("should be able to parse");
          return PR_FALSE;
        }
      } else if (nsCSSProps::FindKeyword(keyword,
                   nsCSSProps::kBackgroundRepeatKTable, dummy)) {
        if (haveRepeat)
          return PR_FALSE;
        haveRepeat = PR_TRUE;
        if (!ParseSingleValueProperty(aState.mRepeat->mValue,
                                      eCSSProperty_background_repeat)) {
          NS_NOTREACHED("should be able to parse");
          return PR_FALSE;
        }
      } else if (nsCSSProps::FindKeyword(keyword,
                   nsCSSProps::kBackgroundPositionKTable, dummy)) {
        if (havePosition)
          return PR_FALSE;
        havePosition = PR_TRUE;
        nsCSSValuePair scratch;
        if (!ParseBoxPositionValues(scratch, PR_FALSE)) {
          return PR_FALSE;
        }
        aState.mPosition->mXValue = scratch.mXValue;
        aState.mPosition->mYValue = scratch.mYValue;
      } else if (nsCSSProps::FindKeyword(keyword,
                   nsCSSProps::kBackgroundOriginKTable, dummy)) {
        if (haveOrigin)
          return PR_FALSE;
        haveOrigin = PR_TRUE;
        if (!ParseSingleValueProperty(aState.mOrigin->mValue,
                                      eCSSProperty_background_origin)) {
          NS_NOTREACHED("should be able to parse");
          return PR_FALSE;
        }
        PR_STATIC_ASSERT(NS_STYLE_BG_CLIP_BORDER ==
                         NS_STYLE_BG_ORIGIN_BORDER);
        PR_STATIC_ASSERT(NS_STYLE_BG_CLIP_PADDING ==
                         NS_STYLE_BG_ORIGIN_PADDING);
        PR_STATIC_ASSERT(NS_STYLE_BG_CLIP_CONTENT ==
                         NS_STYLE_BG_ORIGIN_CONTENT);
        aState.mClip->mValue = aState.mOrigin->mValue;
      } else {
        if (haveColor)
          return PR_FALSE;
        haveColor = PR_TRUE;
        if (!ParseSingleValueProperty(aState.mColor,
                                      eCSSProperty_background_color)) {
          return PR_FALSE;
        }
      }
    } else if (tt == eCSSToken_Function &&
               (mToken.mIdent.LowerCaseEqualsLiteral("url") ||
                mToken.mIdent.LowerCaseEqualsLiteral("-moz-linear-gradient") ||
                mToken.mIdent.LowerCaseEqualsLiteral("-moz-radial-gradient") ||
                mToken.mIdent.LowerCaseEqualsLiteral("-moz-repeating-linear-gradient") ||
                mToken.mIdent.LowerCaseEqualsLiteral("-moz-repeating-radial-gradient") ||
                mToken.mIdent.LowerCaseEqualsLiteral("-moz-image-rect") ||
                mToken.mIdent.LowerCaseEqualsLiteral("-moz-element"))) {
      if (haveImage)
        return PR_FALSE;
      haveImage = PR_TRUE;
      if (!ParseSingleValueProperty(aState.mImage->mValue,
                                    eCSSProperty_background_image)) {
        return PR_FALSE;
      }
    } else if (tt == eCSSToken_Dimension ||
               tt == eCSSToken_Number ||
               tt == eCSSToken_Percentage ||
               (tt == eCSSToken_Function &&
                mToken.mIdent.LowerCaseEqualsLiteral("-moz-calc"))) {
      if (havePosition)
        return PR_FALSE;
      havePosition = PR_TRUE;
      nsCSSValuePair scratch;
      if (!ParseBoxPositionValues(scratch, PR_FALSE)) {
        return PR_FALSE;
      }
      aState.mPosition->mXValue = scratch.mXValue;
      aState.mPosition->mYValue = scratch.mYValue;
    } else {
      if (haveColor)
        return PR_FALSE;
      haveColor = PR_TRUE;
      // Note: This parses 'inherit' and 'initial', but
      // we've already checked for them, so it's ok.
      if (!ParseSingleValueProperty(aState.mColor,
                                    eCSSProperty_background_color)) {
        return PR_FALSE;
      }
    }
    haveSomething = PR_TRUE;
  }

  return haveSomething;
}

// This function is very similar to ParseBackgroundPosition and
// ParseBackgroundSize.
PRBool
CSSParserImpl::ParseBackgroundList(nsCSSProperty aPropID)
{
  // aPropID is a single value prop-id
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT, nsnull)) {
    // 'initial' and 'inherit' stand alone, no list permitted.
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList* item = value.SetListValue();
    for (;;) {
      if (!ParseSingleValueProperty(item->mValue, aPropID)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      if (!ExpectSymbol(',', PR_TRUE)) {
        return PR_FALSE;
      }
      item->mNext = new nsCSSValueList;
      item = item->mNext;
    }
  }
  AppendValue(aPropID, value);
  return PR_TRUE;
}

// This function is very similar to ParseBackgroundList and ParseBackgroundSize.
PRBool
CSSParserImpl::ParseBackgroundPosition()
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT, nsnull)) {
    // 'initial' and 'inherit' stand alone, no list permitted.
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValuePair valuePair;
    if (!ParseBoxPositionValues(valuePair, PR_FALSE)) {
      return PR_FALSE;
    }
    nsCSSValuePairList* item = value.SetPairListValue();
    for (;;) {
      item->mXValue = valuePair.mXValue;
      item->mYValue = valuePair.mYValue;
      if (CheckEndProperty()) {
        break;
      }
      if (!ExpectSymbol(',', PR_TRUE)) {
        return PR_FALSE;
      }
      if (!ParseBoxPositionValues(valuePair, PR_FALSE)) {
        return PR_FALSE;
      }
      item->mNext = new nsCSSValuePairList;
      item = item->mNext;
    }
  }
  AppendValue(eCSSProperty_background_position, value);
  return PR_TRUE;
}

/**
 * Parses two values that correspond to positions in a box.  These can be
 * values corresponding to percentages of the box, raw offsets, or keywords
 * like "top," "left center," etc.
 *
 * @param aOut The nsCSSValuePair in which to place the result.
 * @param aAcceptsInherit If true, 'inherit' and 'initial' are legal values
 * @return Whether or not the operation succeeded.
 */
PRBool CSSParserImpl::ParseBoxPositionValues(nsCSSValuePair &aOut,
                                             PRBool aAcceptsInherit)
{
  // First try a percentage or a length value
  nsCSSValue &xValue = aOut.mXValue,
             &yValue = aOut.mYValue;
  PRInt32 variantMask =
    (aAcceptsInherit ? VARIANT_INHERIT : 0) | VARIANT_LP | VARIANT_CALC;
  if (ParseVariant(xValue, variantMask, nsnull)) {
    if (eCSSUnit_Inherit == xValue.GetUnit() ||
        eCSSUnit_Initial == xValue.GetUnit()) {  // both are inherited or both are set to initial
      yValue = xValue;
      return PR_TRUE;
    }
    // We have one percentage/length/calc. Get the optional second
    // percentage/length/calc/keyword.
    if (ParseVariant(yValue, VARIANT_LP | VARIANT_CALC, nsnull)) {
      // We have two numbers
      return PR_TRUE;
    }

    if (ParseEnum(yValue, nsCSSProps::kBackgroundPositionKTable)) {
      PRInt32 yVal = yValue.GetIntValue();
      if (!(yVal & BG_CTB)) {
        // The second keyword can only be 'center', 'top', or 'bottom'
        return PR_FALSE;
      }
      yValue = BoxPositionMaskToCSSValue(yVal, PR_FALSE);
      return PR_TRUE;
    }

    // If only one percentage or length value is given, it sets the
    // horizontal position only, and the vertical position will be 50%.
    yValue.SetPercentValue(0.5f);
    return PR_TRUE;
  }

  // Now try keywords. We do this manually to allow for the first
  // appearance of "center" to apply to the either the x or y
  // position (it's ambiguous so we have to disambiguate). Each
  // allowed keyword value is assigned it's own bit. We don't allow
  // any duplicate keywords other than center. We try to get two
  // keywords but it's okay if there is only one.
  PRInt32 mask = 0;
  if (ParseEnum(xValue, nsCSSProps::kBackgroundPositionKTable)) {
    PRInt32 bit = xValue.GetIntValue();
    mask |= bit;
    if (ParseEnum(xValue, nsCSSProps::kBackgroundPositionKTable)) {
      bit = xValue.GetIntValue();
      if (mask & (bit & ~BG_CENTER)) {
        // Only the 'center' keyword can be duplicated.
        return PR_FALSE;
      }
      mask |= bit;
    }
    else {
      // Only one keyword.  See if we have a length, percentage, or calc.
      if (ParseVariant(yValue, VARIANT_LP | VARIANT_CALC, nsnull)) {
        if (!(mask & BG_CLR)) {
          // The first keyword can only be 'center', 'left', or 'right'
          return PR_FALSE;
        }

        xValue = BoxPositionMaskToCSSValue(mask, PR_TRUE);
        return PR_TRUE;
      }
    }
  }

  // Check for bad input. Bad input consists of no matching keywords,
  // or pairs of x keywords or pairs of y keywords.
  if ((mask == 0) || (mask == (BG_TOP | BG_BOTTOM)) ||
      (mask == (BG_LEFT | BG_RIGHT))) {
    return PR_FALSE;
  }

  // Create style values
  xValue = BoxPositionMaskToCSSValue(mask, PR_TRUE);
  yValue = BoxPositionMaskToCSSValue(mask, PR_FALSE);
  return PR_TRUE;
}

// This function is very similar to ParseBackgroundList and
// ParseBackgroundPosition.
PRBool
CSSParserImpl::ParseBackgroundSize()
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT, nsnull)) {
    // 'initial' and 'inherit' stand alone, no list permitted.
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValuePair valuePair;
    if (!ParseBackgroundSizeValues(valuePair)) {
      return PR_FALSE;
    }
    nsCSSValuePairList* item = value.SetPairListValue();
    for (;;) {
      item->mXValue = valuePair.mXValue;
      item->mYValue = valuePair.mYValue;
      if (CheckEndProperty()) {
        break;
      }
      if (!ExpectSymbol(',', PR_TRUE)) {
        return PR_FALSE;
      }
      if (!ParseBackgroundSizeValues(valuePair)) {
        return PR_FALSE;
      }
      item->mNext = new nsCSSValuePairList;
      item = item->mNext;
    }
  }
  AppendValue(eCSSProperty_background_size, value);
  return PR_TRUE;
}

/**
 * Parses two values that correspond to lengths for the background-size
 * property.  These can be one or two lengths (or the 'auto' keyword) or
 * percentages corresponding to the element's dimensions or the single keywords
 * 'contain' or 'cover'.  'initial' and 'inherit' must be handled by the caller
 * if desired.
 *
 * @param aOut The nsCSSValuePair in which to place the result.
 * @return Whether or not the operation succeeded.
 */
#define BG_SIZE_VARIANT (VARIANT_LP | VARIANT_AUTO | VARIANT_CALC)
PRBool CSSParserImpl::ParseBackgroundSizeValues(nsCSSValuePair &aOut)
{
  // First try a percentage or a length value
  nsCSSValue &xValue = aOut.mXValue,
             &yValue = aOut.mYValue;
  if (ParseNonNegativeVariant(xValue, BG_SIZE_VARIANT, nsnull)) {
    // We have one percentage/length/calc/auto. Get the optional second
    // percentage/length/calc/keyword.
    if (ParseNonNegativeVariant(yValue, BG_SIZE_VARIANT, nsnull)) {
      // We have a second percentage/length/calc/auto.
      return PR_TRUE;
    }

    // If only one percentage or length value is given, it sets the
    // horizontal size only, and the vertical size will be as if by 'auto'.
    yValue.SetAutoValue();
    return PR_TRUE;
  }

  // Now address 'contain' and 'cover'.
  if (!ParseEnum(xValue, nsCSSProps::kBackgroundSizeKTable))
    return PR_FALSE;
  yValue.Reset();
  return PR_TRUE;
}
#undef BG_SIZE_VARIANT

PRBool
CSSParserImpl::ParseBorderColor()
{
  static const nsCSSProperty kBorderColorSources[] = {
    eCSSProperty_border_left_color_ltr_source,
    eCSSProperty_border_left_color_rtl_source,
    eCSSProperty_border_right_color_ltr_source,
    eCSSProperty_border_right_color_rtl_source,
    eCSSProperty_UNKNOWN
  };

  // do this now, in case 4 values weren't specified
  InitBoxPropsAsPhysical(kBorderColorSources);
  return ParseBoxProperties(kBorderColorIDs);
}

PRBool
CSSParserImpl::ParseBorderImage()
{
  nsCSSValue val;
  if (ParseVariant(val, VARIANT_INHERIT | VARIANT_NONE, nsnull)) {
    AppendValue(eCSSProperty_border_image, val);
    return PR_TRUE;
  }

  // <uri> [<number> | <percentage>]{1,4}
  //       [ / <border-width>{1,4} ]? [stretch | repeat | round]{0,2}
  nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(11);

  nsCSSValue& url = arr->Item(0);
  nsCSSValue& splitTop = arr->Item(1);
  nsCSSValue& splitRight = arr->Item(2);
  nsCSSValue& splitBottom = arr->Item(3);
  nsCSSValue& splitLeft = arr->Item(4);
  nsCSSValue& borderWidthTop = arr->Item(5);
  nsCSSValue& borderWidthRight = arr->Item(6);
  nsCSSValue& borderWidthBottom = arr->Item(7);
  nsCSSValue& borderWidthLeft = arr->Item(8);
  nsCSSValue& horizontalKeyword = arr->Item(9);
  nsCSSValue& verticalKeyword = arr->Item(10);

  // <uri>
  if (!ParseVariant(url, VARIANT_URL, nsnull)) {
    return PR_FALSE;
  }

  // [<number> | <percentage>]{1,4}
  if (!ParseNonNegativeVariant(splitTop,
                               VARIANT_NUMBER | VARIANT_PERCENT, nsnull)) {
    return PR_FALSE;
  }
  if (!ParseNonNegativeVariant(splitRight,
                               VARIANT_NUMBER | VARIANT_PERCENT, nsnull)) {
    splitRight = splitTop;
  }
  if (!ParseNonNegativeVariant(splitBottom,
                               VARIANT_NUMBER | VARIANT_PERCENT, nsnull)) {
    splitBottom = splitTop;
  }
  if (!ParseNonNegativeVariant(splitLeft,
                               VARIANT_NUMBER | VARIANT_PERCENT, nsnull)) {
    splitLeft = splitRight;
  }

  // [ / <border-width>{1,4} ]?
  if (ExpectSymbol('/', PR_TRUE)) {
    // if have '/', at least one value is required
    if (!ParseNonNegativeVariant(borderWidthTop, VARIANT_LENGTH, nsnull)) {
      return PR_FALSE;
    }
    if (!ParseNonNegativeVariant(borderWidthRight, VARIANT_LENGTH, nsnull)) {
      borderWidthRight = borderWidthTop;
    }
    if (!ParseNonNegativeVariant(borderWidthBottom, VARIANT_LENGTH, nsnull)) {
      borderWidthBottom = borderWidthTop;
    }
    if (!ParseNonNegativeVariant(borderWidthLeft, VARIANT_LENGTH, nsnull)) {
      borderWidthLeft = borderWidthRight;
    }
  }

  // [stretch | repeat | round]{0,2}
  // missing keywords are handled in nsRuleNode::ComputeBorderData()
  if (ParseEnum(horizontalKeyword, nsCSSProps::kBorderImageKTable)) {
    (void)ParseEnum(verticalKeyword, nsCSSProps::kBorderImageKTable);
  }

  if (!ExpectEndProperty()) {
    return PR_FALSE;
  }

  val.SetArrayValue(arr, eCSSUnit_Array);
  AppendValue(eCSSProperty_border_image, val);

  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseBorderSpacing()
{
  nsCSSValue xValue, yValue;
  if (!ParseNonNegativeVariant(xValue, VARIANT_HL | VARIANT_CALC, nsnull)) {
    return PR_FALSE;
  }

  // If we have one length, get the optional second length.
  // set the second value equal to the first.
  if (xValue.IsLengthUnit() || xValue.IsCalcUnit()) {
    ParseNonNegativeVariant(yValue, VARIANT_LENGTH | VARIANT_CALC, nsnull);
  }

  if (!ExpectEndProperty()) {
    return PR_FALSE;
  }

  if (yValue == xValue || yValue.GetUnit() == eCSSUnit_Null) {
    AppendValue(eCSSProperty_border_spacing, xValue);
  } else {
    nsCSSValue pair;
    pair.SetPairValue(xValue, yValue);
    AppendValue(eCSSProperty_border_spacing, pair);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseBorderSide(const nsCSSProperty aPropIDs[],
                               PRBool aSetAllSides)
{
  const PRInt32 numProps = 3;
  nsCSSValue  values[numProps];

  PRInt32 found = ParseChoice(values, aPropIDs, numProps);
  if ((found < 1) || (PR_FALSE == ExpectEndProperty())) {
    return PR_FALSE;
  }

  if ((found & 1) == 0) { // Provide default border-width
    values[0].SetIntValue(NS_STYLE_BORDER_WIDTH_MEDIUM, eCSSUnit_Enumerated);
  }
  if ((found & 2) == 0) { // Provide default border-style
    values[1].SetIntValue(NS_STYLE_BORDER_STYLE_NONE, eCSSUnit_Enumerated);
  }
  if ((found & 4) == 0) { // text color will be used
    values[2].SetIntValue(NS_STYLE_COLOR_MOZ_USE_TEXT_COLOR, eCSSUnit_Enumerated);
  }

  if (aSetAllSides) {
    static const nsCSSProperty kBorderSources[] = {
      eCSSProperty_border_left_color_ltr_source,
      eCSSProperty_border_left_color_rtl_source,
      eCSSProperty_border_right_color_ltr_source,
      eCSSProperty_border_right_color_rtl_source,
      eCSSProperty_border_left_style_ltr_source,
      eCSSProperty_border_left_style_rtl_source,
      eCSSProperty_border_right_style_ltr_source,
      eCSSProperty_border_right_style_rtl_source,
      eCSSProperty_border_left_width_ltr_source,
      eCSSProperty_border_left_width_rtl_source,
      eCSSProperty_border_right_width_ltr_source,
      eCSSProperty_border_right_width_rtl_source,
      eCSSProperty_UNKNOWN
    };

    InitBoxPropsAsPhysical(kBorderSources);

    // Parsing "border" shorthand; set all four sides to the same thing
    for (PRInt32 index = 0; index < 4; index++) {
      NS_ASSERTION(numProps == 3, "This code needs updating");
      AppendValue(kBorderWidthIDs[index], values[0]);
      AppendValue(kBorderStyleIDs[index], values[1]);
      AppendValue(kBorderColorIDs[index], values[2]);
    }

    static const nsCSSProperty kBorderColorsProps[] = {
      eCSSProperty_border_top_colors,
      eCSSProperty_border_right_colors,
      eCSSProperty_border_bottom_colors,
      eCSSProperty_border_left_colors
    };

    // Set the other properties that the border shorthand sets to their
    // initial values.
    nsCSSValue extraValue;
    switch (values[0].GetUnit()) {
      case eCSSUnit_Inherit:    extraValue.SetInheritValue();    break;
      case eCSSUnit_Initial:    extraValue.SetInitialValue();    break;
      default:                  extraValue.SetNoneValue();       break;
    }
    NS_FOR_CSS_SIDES(side) {
      AppendValue(kBorderColorsProps[side], extraValue);
    }
    AppendValue(eCSSProperty_border_image, extraValue);
  }
  else {
    // Just set our one side
    for (PRInt32 index = 0; index < numProps; index++) {
      AppendValue(aPropIDs[index], values[index]);
    }
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseDirectionalBorderSide(const nsCSSProperty aPropIDs[],
                                          PRInt32 aSourceType)
{
  const PRInt32 numProps = 3;
  nsCSSValue  values[numProps];

  PRInt32 found = ParseChoice(values, aPropIDs, numProps);
  if ((found < 1) || (PR_FALSE == ExpectEndProperty())) {
    return PR_FALSE;
  }

  if ((found & 1) == 0) { // Provide default border-width
    values[0].SetIntValue(NS_STYLE_BORDER_WIDTH_MEDIUM, eCSSUnit_Enumerated);
  }
  if ((found & 2) == 0) { // Provide default border-style
    values[1].SetIntValue(NS_STYLE_BORDER_STYLE_NONE, eCSSUnit_Enumerated);
  }
  if ((found & 4) == 0) { // text color will be used
    values[2].SetIntValue(NS_STYLE_COLOR_MOZ_USE_TEXT_COLOR, eCSSUnit_Enumerated);
  }
  for (PRInt32 index = 0; index < numProps; index++) {
    const nsCSSProperty* subprops =
      nsCSSProps::SubpropertyEntryFor(aPropIDs[index + numProps]);
    NS_ASSERTION(subprops[3] == eCSSProperty_UNKNOWN,
                 "not box property with physical vs. logical cascading");
    AppendValue(subprops[0], values[index]);
    nsCSSValue typeVal(aSourceType, eCSSUnit_Enumerated);
    AppendValue(subprops[1], typeVal);
    AppendValue(subprops[2], typeVal);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseBorderStyle()
{
  static const nsCSSProperty kBorderStyleSources[] = {
    eCSSProperty_border_left_style_ltr_source,
    eCSSProperty_border_left_style_rtl_source,
    eCSSProperty_border_right_style_ltr_source,
    eCSSProperty_border_right_style_rtl_source,
    eCSSProperty_UNKNOWN
  };

  // do this now, in case 4 values weren't specified
  InitBoxPropsAsPhysical(kBorderStyleSources);
  return ParseBoxProperties(kBorderStyleIDs);
}

PRBool
CSSParserImpl::ParseBorderWidth()
{
  static const nsCSSProperty kBorderWidthSources[] = {
    eCSSProperty_border_left_width_ltr_source,
    eCSSProperty_border_left_width_rtl_source,
    eCSSProperty_border_right_width_ltr_source,
    eCSSProperty_border_right_width_rtl_source,
    eCSSProperty_UNKNOWN
  };

  // do this now, in case 4 values weren't specified
  InitBoxPropsAsPhysical(kBorderWidthSources);
  return ParseBoxProperties(kBorderWidthIDs);
}

PRBool
CSSParserImpl::ParseBorderColors(nsCSSProperty aProperty)
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT | VARIANT_NONE, nsnull)) {
    // 'inherit', 'initial', and 'none' are only allowed on their own
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList *cur = value.SetListValue();
    for (;;) {
      if (!ParseVariant(cur->mValue, VARIANT_COLOR | VARIANT_KEYWORD,
                        nsCSSProps::kBorderColorKTable)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(aProperty, value);
  return PR_TRUE;
}

// Parse the top level of a calc() expression.
PRBool
CSSParserImpl::ParseCalc(nsCSSValue &aValue, PRInt32 aVariantMask)
{
  // Parsing calc expressions requires, in a number of cases, looking
  // for a token that is *either* a value of the property or a number.
  // This can be done without lookahead when we assume that the property
  // values cannot themselves be numbers.
  NS_ASSERTION(!(aVariantMask & VARIANT_NUMBER), "unexpected variant mask");
  NS_ABORT_IF_FALSE(aVariantMask != 0, "unexpected variant mask");

  // One-iteration loop so we can break to the error-handling case.
  do {
    // The toplevel of a calc() is always an nsCSSValue::Array of length 1.
    nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(1);

    if (!ParseCalcAdditiveExpression(arr->Item(0), aVariantMask))
      break;

    if (!ExpectSymbol(')', PR_TRUE))
      break;

    aValue.SetArrayValue(arr, eCSSUnit_Calc);
    return PR_TRUE;
  } while (PR_FALSE);

  SkipUntil(')');
  return PR_FALSE;
}

// We optimize away the <value-expression> production given that
// ParseVariant consumes initial whitespace and we call
// ExpectSymbol(')') with PR_TRUE for aSkipWS.
//  * If aVariantMask is VARIANT_NUMBER, this function parses the
//    <number-additive-expression> production.
//  * If aVariantMask does not contain VARIANT_NUMBER, this function
//    parses the <value-additive-expression> production.
//  * Otherwise (VARIANT_NUMBER and other bits) this function parses
//    whichever one of the productions matches ***and modifies
//    aVariantMask*** to reflect which one it has parsed by either
//    removing VARIANT_NUMBER or removing all other bits.
// It does so iteratively, but builds the correct recursive
// data structure.
PRBool
CSSParserImpl::ParseCalcAdditiveExpression(nsCSSValue& aValue,
                                           PRInt32& aVariantMask)
{
  NS_ABORT_IF_FALSE(aVariantMask != 0, "unexpected variant mask");
  nsCSSValue *storage = &aValue;
  for (;;) {
    PRBool haveWS;
    if (!ParseCalcMultiplicativeExpression(*storage, aVariantMask, &haveWS))
      return PR_FALSE;

    if (!haveWS || !GetToken(PR_FALSE))
      return PR_TRUE;
    nsCSSUnit unit;
    if (mToken.IsSymbol('+')) {
      unit = eCSSUnit_Calc_Plus;
    } else if (mToken.IsSymbol('-')) {
      unit = eCSSUnit_Calc_Minus;
    } else {
      UngetToken();
      return PR_TRUE;
    }
    if (!RequireWhitespace())
      return PR_FALSE;

    nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(2);
    arr->Item(0) = aValue;
    storage = &arr->Item(1);
    aValue.SetArrayValue(arr, unit);
  }
}

struct ReduceNumberCalcOps : public mozilla::css::BasicFloatCalcOps,
                             public mozilla::css::CSSValueInputCalcOps
{
  result_type ComputeLeafValue(const nsCSSValue& aValue)
  {
    NS_ABORT_IF_FALSE(aValue.GetUnit() == eCSSUnit_Number, "unexpected unit");
    return aValue.GetFloatValue();
  }

  float ComputeNumber(const nsCSSValue& aValue)
  {
    return mozilla::css::ComputeCalc(aValue, *this);
  }
};

//  * If aVariantMask is VARIANT_NUMBER, this function parses the
//    <number-multiplicative-expression> production.
//  * If aVariantMask does not contain VARIANT_NUMBER, this function
//    parses the <value-multiplicative-expression> production.
//  * Otherwise (VARIANT_NUMBER and other bits) this function parses
//    whichever one of the productions matches ***and modifies
//    aVariantMask*** to reflect which one it has parsed by either
//    removing VARIANT_NUMBER or removing all other bits.
// It does so iteratively, but builds the correct recursive data
// structure.
// This function always consumes *trailing* whitespace when it returns
// true; whether there was any such whitespace is returned in the
// aHadFinalWS parameter.
PRBool
CSSParserImpl::ParseCalcMultiplicativeExpression(nsCSSValue& aValue,
                                                 PRInt32& aVariantMask,
                                                 PRBool *aHadFinalWS)
{
  NS_ABORT_IF_FALSE(aVariantMask != 0, "unexpected variant mask");
  PRBool gotValue = PR_FALSE; // already got the part with the unit
  PRBool afterDivision = PR_FALSE;

  nsCSSValue *storage = &aValue;
  for (;;) {
    PRInt32 variantMask;
    if (afterDivision || gotValue) {
      variantMask = VARIANT_NUMBER;
    } else {
      variantMask = aVariantMask | VARIANT_NUMBER;
    }
    if (!ParseCalcTerm(*storage, variantMask))
      return PR_FALSE;
    NS_ABORT_IF_FALSE(variantMask != 0,
                      "ParseCalcTerm did not set variantMask appropriately");
    NS_ABORT_IF_FALSE(!(variantMask & VARIANT_NUMBER) ||
                      !(variantMask & ~PRInt32(VARIANT_NUMBER)),
                      "ParseCalcTerm did not set variantMask appropriately");

    if (variantMask & VARIANT_NUMBER) {
      // Simplify the value immediately so we can check for division by
      // zero.
      ReduceNumberCalcOps ops;
      float number = mozilla::css::ComputeCalc(*storage, ops);
      if (number == 0.0 && afterDivision)
        return PR_FALSE;
      storage->SetFloatValue(number, eCSSUnit_Number);
    } else {
      gotValue = PR_TRUE;

      if (storage != &aValue) {
        // Simplify any numbers in the Times_L position (which are
        // not simplified by the check above).
        NS_ABORT_IF_FALSE(storage == &aValue.GetArrayValue()->Item(1),
                          "unexpected relationship to current storage");
        nsCSSValue &leftValue = aValue.GetArrayValue()->Item(0);
        ReduceNumberCalcOps ops;
        float number = mozilla::css::ComputeCalc(leftValue, ops);
        leftValue.SetFloatValue(number, eCSSUnit_Number);
      }
    }

    PRBool hadWS = RequireWhitespace();
    if (!GetToken(PR_FALSE)) {
      *aHadFinalWS = hadWS;
      break;
    }
    nsCSSUnit unit;
    if (mToken.IsSymbol('*')) {
      unit = gotValue ? eCSSUnit_Calc_Times_R : eCSSUnit_Calc_Times_L;
      afterDivision = PR_FALSE;
    } else if (mToken.IsSymbol('/')) {
      unit = eCSSUnit_Calc_Divided;
      afterDivision = PR_TRUE;
    } else {
      UngetToken();
      *aHadFinalWS = hadWS;
      break;
    }

    nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(2);
    arr->Item(0) = aValue;
    storage = &arr->Item(1);
    aValue.SetArrayValue(arr, unit);
  }

  // Adjust aVariantMask (see comments above function) to reflect which
  // option we took.
  if (aVariantMask & VARIANT_NUMBER) {
    if (gotValue) {
      aVariantMask &= ~PRInt32(VARIANT_NUMBER);
    } else {
      aVariantMask = VARIANT_NUMBER;
    }
  } else {
    if (!gotValue) {
      // We had to find a value, but we didn't.
      return PR_FALSE;
    }
  }

  return PR_TRUE;
}

//  * If aVariantMask is VARIANT_NUMBER, this function parses the
//    <number-term> production.
//  * If aVariantMask does not contain VARIANT_NUMBER, this function
//    parses the <value-term> production.
//  * Otherwise (VARIANT_NUMBER and other bits) this function parses
//    whichever one of the productions matches ***and modifies
//    aVariantMask*** to reflect which one it has parsed by either
//    removing VARIANT_NUMBER or removing all other bits.
PRBool
CSSParserImpl::ParseCalcTerm(nsCSSValue& aValue, PRInt32& aVariantMask)
{
  NS_ABORT_IF_FALSE(aVariantMask != 0, "unexpected variant mask");
  if (!GetToken(PR_TRUE))
    return PR_FALSE;
  // Either an additive expression in parentheses...
  if (mToken.IsSymbol('(')) {
    if (!ParseCalcAdditiveExpression(aValue, aVariantMask) ||
        !ExpectSymbol(')', PR_TRUE)) {
      SkipUntil(')');
      return PR_FALSE;
    }
    return PR_TRUE;
  }
  // ... or just a value
  UngetToken();
  if (!ParseVariant(aValue, aVariantMask, nsnull)) {
    return PR_FALSE;
  }
  // If we did the value parsing, we need to adjust aVariantMask to
  // reflect which option we took (see above).
  if (aVariantMask & VARIANT_NUMBER) {
    if (aValue.GetUnit() == eCSSUnit_Number) {
      aVariantMask = VARIANT_NUMBER;
    } else {
      aVariantMask &= ~PRInt32(VARIANT_NUMBER);
    }
  }
  return PR_TRUE;
}

// This function consumes all consecutive whitespace and returns whether
// there was any.
PRBool
CSSParserImpl::RequireWhitespace()
{
  if (!GetToken(PR_FALSE))
    return PR_FALSE;
  if (mToken.mType != eCSSToken_WhiteSpace) {
    UngetToken();
    return PR_FALSE;
  }
  // Skip any additional whitespace tokens.
  if (GetToken(PR_TRUE)) {
    UngetToken();
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseRect(nsCSSProperty aPropID)
{
  if (! GetToken(PR_TRUE)) {
    return PR_FALSE;
  }

  nsCSSValue val;

  if (mToken.mType == eCSSToken_Ident) {
    nsCSSKeyword keyword = nsCSSKeywords::LookupKeyword(mToken.mIdent);
    switch (keyword) {
      case eCSSKeyword_auto:
        if (!ExpectEndProperty()) {
          return PR_FALSE;
        }
        val.SetAutoValue();
        break;
      case eCSSKeyword_inherit:
        if (!ExpectEndProperty()) {
          return PR_FALSE;
        }
        val.SetInheritValue();
        break;
      case eCSSKeyword__moz_initial:
        if (!ExpectEndProperty()) {
          return PR_FALSE;
        }
        val.SetInitialValue();
        break;
      default:
        UngetToken();
        return PR_FALSE;
    }
  } else if (mToken.mType == eCSSToken_Function &&
             mToken.mIdent.LowerCaseEqualsLiteral("rect")) {
    nsCSSRect& rect = val.SetRectValue();
    NS_FOR_CSS_SIDES(side) {
      if (! ParseVariant(rect.*(nsCSSRect::sides[side]),
                         VARIANT_AL, nsnull)) {
        return PR_FALSE;
      }
      if (side < 3) {
        // skip optional commas between elements
        (void)ExpectSymbol(',', PR_TRUE);
      }
    }
    if (!ExpectSymbol(')', PR_TRUE)) {
      return PR_FALSE;
    }
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    UngetToken();
    return PR_FALSE;
  }

  AppendValue(aPropID, val);
  return PR_TRUE;
}

#define VARIANT_CONTENT (VARIANT_STRING | VARIANT_URL | VARIANT_COUNTER | VARIANT_ATTR | \
                         VARIANT_KEYWORD)
PRBool
CSSParserImpl::ParseContent()
{
  // We need to divide the 'content' keywords into two classes for
  // ParseVariant's sake, so we can't just use nsCSSProps::kContentKTable.
  static const PRInt32 kContentListKWs[] = {
    eCSSKeyword_open_quote, NS_STYLE_CONTENT_OPEN_QUOTE,
    eCSSKeyword_close_quote, NS_STYLE_CONTENT_CLOSE_QUOTE,
    eCSSKeyword_no_open_quote, NS_STYLE_CONTENT_NO_OPEN_QUOTE,
    eCSSKeyword_no_close_quote, NS_STYLE_CONTENT_NO_CLOSE_QUOTE,
    eCSSKeyword_UNKNOWN,-1
  };

  static const PRInt32 kContentSolitaryKWs[] = {
    eCSSKeyword__moz_alt_content, NS_STYLE_CONTENT_ALT_CONTENT,
    eCSSKeyword_UNKNOWN,-1
  };

  // Verify that these two lists add up to the size of
  // nsCSSProps::kContentKTable.
  NS_ABORT_IF_FALSE(nsCSSProps::kContentKTable[
                      NS_ARRAY_LENGTH(kContentListKWs) +
                      NS_ARRAY_LENGTH(kContentSolitaryKWs) - 4] ==
                    eCSSKeyword_UNKNOWN &&
                    nsCSSProps::kContentKTable[
                      NS_ARRAY_LENGTH(kContentListKWs) +
                      NS_ARRAY_LENGTH(kContentSolitaryKWs) - 3] == -1,
                    "content keyword tables out of sync");

  nsCSSValue value;
  if (ParseVariant(value, VARIANT_HMK | VARIANT_NONE,
                   kContentSolitaryKWs)) {
    // 'inherit', 'initial', 'normal', 'none', and 'alt-content' must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList* cur = value.SetListValue();
    for (;;) {
      if (!ParseVariant(cur->mValue, VARIANT_CONTENT, kContentListKWs)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(eCSSProperty_content, value);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseCounterData(nsCSSProperty aPropID)
{
  nsCSSValue value;
  if (!ParseVariant(value, VARIANT_INHERIT | VARIANT_NONE, nsnull)) {
    if (!GetToken(PR_TRUE) || mToken.mType != eCSSToken_Ident) {
      return PR_FALSE;
    }

    nsCSSValuePairList *cur = value.SetPairListValue();
    for (;;) {
      cur->mXValue.SetStringValue(mToken.mIdent, eCSSUnit_Ident);
      if (!GetToken(PR_TRUE)) {
        break;
      }
      if (mToken.mType == eCSSToken_Number && mToken.mIntegerValid) {
        cur->mYValue.SetIntValue(mToken.mInteger, eCSSUnit_Integer);
      } else {
        UngetToken();
      }
      if (CheckEndProperty()) {
        break;
      }
      if (!GetToken(PR_TRUE) || mToken.mType != eCSSToken_Ident) {
        return PR_FALSE;
      }
      cur->mNext = new nsCSSValuePairList;
      cur = cur->mNext;
    }
  }
  AppendValue(aPropID, value);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseCue()
{
  nsCSSValue before;
  if (ParseSingleValueProperty(before, eCSSProperty_cue_before)) {
    if (eCSSUnit_Inherit != before.GetUnit() &&
        eCSSUnit_Initial != before.GetUnit()) {
      nsCSSValue after;
      if (ParseSingleValueProperty(after, eCSSProperty_cue_after)) {
        if (ExpectEndProperty()) {
          AppendValue(eCSSProperty_cue_before, before);
          AppendValue(eCSSProperty_cue_after, after);
          return PR_TRUE;
        }
        return PR_FALSE;
      }
    }
    if (ExpectEndProperty()) {
      AppendValue(eCSSProperty_cue_before, before);
      AppendValue(eCSSProperty_cue_after, before);
      return PR_TRUE;
    }
  }
  return PR_FALSE;
}

PRBool
CSSParserImpl::ParseCursor()
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT, nsnull)) {
    // 'inherit' and 'initial' must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList* cur = value.SetListValue();
    for (;;) {
      if (!ParseVariant(cur->mValue, VARIANT_UK, nsCSSProps::kCursorKTable)) {
        return PR_FALSE;
      }
      if (cur->mValue.GetUnit() != eCSSUnit_URL) { // keyword must be last
        if (ExpectEndProperty()) {
          break;
        }
        return PR_FALSE;
      }

      // We have a URL, so make a value array with three values.
      nsRefPtr<nsCSSValue::Array> val = nsCSSValue::Array::Create(3);
      val->Item(0) = cur->mValue;

      // Parse optional x and y position of cursor hotspot (css3-ui).
      if (ParseVariant(val->Item(1), VARIANT_NUMBER, nsnull)) {
        // If we have one number, we must have two.
        if (!ParseVariant(val->Item(2), VARIANT_NUMBER, nsnull)) {
          return PR_FALSE;
        }
      }
      cur->mValue.SetArrayValue(val, eCSSUnit_Array);

      if (!ExpectSymbol(',', PR_TRUE)) { // url must not be last
        return PR_FALSE;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(eCSSProperty_cursor, value);
  return PR_TRUE;
}


PRBool
CSSParserImpl::ParseFont()
{
  static const nsCSSProperty fontIDs[] = {
    eCSSProperty_font_style,
    eCSSProperty_font_variant,
    eCSSProperty_font_weight
  };

  nsCSSValue  family;
  if (ParseVariant(family, VARIANT_HK, nsCSSProps::kFontKTable)) {
    if (ExpectEndProperty()) {
      if (eCSSUnit_Inherit == family.GetUnit() ||
          eCSSUnit_Initial == family.GetUnit()) {
        AppendValue(eCSSProperty__x_system_font, nsCSSValue(eCSSUnit_None));
        AppendValue(eCSSProperty_font_family, family);
        AppendValue(eCSSProperty_font_style, family);
        AppendValue(eCSSProperty_font_variant, family);
        AppendValue(eCSSProperty_font_weight, family);
        AppendValue(eCSSProperty_font_size, family);
        AppendValue(eCSSProperty_line_height, family);
        AppendValue(eCSSProperty_font_stretch, family);
        AppendValue(eCSSProperty_font_size_adjust, family);
        AppendValue(eCSSProperty_font_feature_settings, family);
        AppendValue(eCSSProperty_font_language_override, family);
      }
      else {
        AppendValue(eCSSProperty__x_system_font, family);
        nsCSSValue systemFont(eCSSUnit_System_Font);
        AppendValue(eCSSProperty_font_family, systemFont);
        AppendValue(eCSSProperty_font_style, systemFont);
        AppendValue(eCSSProperty_font_variant, systemFont);
        AppendValue(eCSSProperty_font_weight, systemFont);
        AppendValue(eCSSProperty_font_size, systemFont);
        AppendValue(eCSSProperty_line_height, systemFont);
        AppendValue(eCSSProperty_font_stretch, systemFont);
        AppendValue(eCSSProperty_font_size_adjust, systemFont);
        AppendValue(eCSSProperty_font_feature_settings, systemFont);
        AppendValue(eCSSProperty_font_language_override, systemFont);
      }
      return PR_TRUE;
    }
    return PR_FALSE;
  }

  // Get optional font-style, font-variant and font-weight (in any order)
  const PRInt32 numProps = 3;
  nsCSSValue  values[numProps];
  PRInt32 found = ParseChoice(values, fontIDs, numProps);
  if ((found < 0) || (eCSSUnit_Inherit == values[0].GetUnit()) ||
      (eCSSUnit_Initial == values[0].GetUnit())) { // illegal data
    return PR_FALSE;
  }
  if ((found & 1) == 0) {
    // Provide default font-style
    values[0].SetIntValue(NS_FONT_STYLE_NORMAL, eCSSUnit_Enumerated);
  }
  if ((found & 2) == 0) {
    // Provide default font-variant
    values[1].SetIntValue(NS_FONT_VARIANT_NORMAL, eCSSUnit_Enumerated);
  }
  if ((found & 4) == 0) {
    // Provide default font-weight
    values[2].SetIntValue(NS_FONT_WEIGHT_NORMAL, eCSSUnit_Enumerated);
  }

  // Get mandatory font-size
  nsCSSValue  size;
  if (! ParseVariant(size, VARIANT_KEYWORD | VARIANT_LP, nsCSSProps::kFontSizeKTable)) {
    return PR_FALSE;
  }

  // Get optional "/" line-height
  nsCSSValue  lineHeight;
  if (ExpectSymbol('/', PR_TRUE)) {
    if (! ParseNonNegativeVariant(lineHeight,
                                  VARIANT_NUMBER | VARIANT_LP | VARIANT_NORMAL,
                                  nsnull)) {
      return PR_FALSE;
    }
  }
  else {
    lineHeight.SetNormalValue();
  }

  // Get final mandatory font-family
  nsAutoParseCompoundProperty compound(this);
  if (ParseFamily(family)) {
    if ((eCSSUnit_Inherit != family.GetUnit()) && (eCSSUnit_Initial != family.GetUnit()) &&
        ExpectEndProperty()) {
      AppendValue(eCSSProperty__x_system_font, nsCSSValue(eCSSUnit_None));
      AppendValue(eCSSProperty_font_family, family);
      AppendValue(eCSSProperty_font_style, values[0]);
      AppendValue(eCSSProperty_font_variant, values[1]);
      AppendValue(eCSSProperty_font_weight, values[2]);
      AppendValue(eCSSProperty_font_size, size);
      AppendValue(eCSSProperty_line_height, lineHeight);
      AppendValue(eCSSProperty_font_stretch,
                  nsCSSValue(NS_FONT_STRETCH_NORMAL, eCSSUnit_Enumerated));
      AppendValue(eCSSProperty_font_size_adjust, nsCSSValue(eCSSUnit_None));
      AppendValue(eCSSProperty_font_feature_settings, nsCSSValue(eCSSUnit_Normal));
      AppendValue(eCSSProperty_font_language_override, nsCSSValue(eCSSUnit_Normal));
      return PR_TRUE;
    }
  }
  return PR_FALSE;
}

PRBool
CSSParserImpl::ParseFontWeight(nsCSSValue& aValue)
{
  if (ParseVariant(aValue, VARIANT_HKI | VARIANT_SYSFONT,
                   nsCSSProps::kFontWeightKTable)) {
    if (eCSSUnit_Integer == aValue.GetUnit()) { // ensure unit value
      PRInt32 intValue = aValue.GetIntValue();
      if ((100 <= intValue) &&
          (intValue <= 900) &&
          (0 == (intValue % 100))) {
        return PR_TRUE;
      } else {
        UngetToken();
        return PR_FALSE;
      }
    }
    return PR_TRUE;
  }
  return PR_FALSE;
}

PRBool
CSSParserImpl::ParseOneFamily(nsAString& aFamily)
{
  if (!GetToken(PR_TRUE))
    return PR_FALSE;

  nsCSSToken* tk = &mToken;

  if (eCSSToken_Ident == tk->mType) {
    aFamily.Append(tk->mIdent);
    for (;;) {
      if (!GetToken(PR_FALSE))
        break;

      if (eCSSToken_Ident == tk->mType) {
        aFamily.Append(tk->mIdent);
      } else if (eCSSToken_WhiteSpace == tk->mType) {
        // Lookahead one token and drop whitespace if we are ending the
        // font name.
        if (!GetToken(PR_TRUE))
          break;

        UngetToken();
        if (eCSSToken_Ident == tk->mType)
          aFamily.Append(PRUnichar(' '));
        else
          break;
      } else {
        UngetToken();
        break;
      }
    }
    return PR_TRUE;

  } else if (eCSSToken_String == tk->mType) {
    aFamily.Append(tk->mSymbol); // replace the quotes
    aFamily.Append(tk->mIdent); // XXX What if it had escaped quotes?
    aFamily.Append(tk->mSymbol);
    return PR_TRUE;

  } else {
    UngetToken();
    return PR_FALSE;
  }
}

///////////////////////////////////////////////////////
// -moz-transform Parsing Implementation

/* Reads a function list of arguments.  Do not call this function
 * directly; it's mean to be caled from ParseFunction.
 */
PRBool
CSSParserImpl::ParseFunctionInternals(const PRInt32 aVariantMask[],
                                      PRUint16 aMinElems,
                                      PRUint16 aMaxElems,
                                      nsTArray<nsCSSValue> &aOutput)
{
  for (PRUint16 index = 0; index < aMaxElems; ++index) {
    nsCSSValue newValue;
    if (!ParseVariant(newValue, aVariantMask[index], nsnull))
      return PR_FALSE;

    if (!aOutput.AppendElement(newValue)) {
      mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
      return PR_FALSE;
    }
    
    // See whether to continue or whether to look for end of function.
    if (!ExpectSymbol(',', PR_TRUE)) {
      // We need to read the closing parenthesis, and also must take care
      // that we haven't read too few symbols.
      return ExpectSymbol(')', PR_TRUE) && (index + 1) >= aMinElems;
    }
  }

  // If we're here, we finished looping without hitting the end, so we read too
  // many elements.
  return PR_FALSE;
}

/* Parses a function [ input of the form (a [, b]*) ] and stores it
 * as an nsCSSValue that holds a function of the form
 * function-name arg1 arg2 ... argN
 *
 * On error, the return value is PR_FALSE.
 *
 * @param aFunction The name of the function that we're reading.
 * @param aAllowedTypes An array of values corresponding to the legal
 *        types for each element in the function.  The zeroth element in the
 *        array corresponds to the first function parameter, etc.  The length
 *        of this array _must_ be greater than or equal to aMaxElems or the
 *        behavior is undefined.
 * @param aMinElems Minimum number of elements to read.  Reading fewer than
 *        this many elements will result in the function failing.
 * @param aMaxElems Maximum number of elements to read.  Reading more than
 *        this many elements will result in the function failing.
 * @param aValue (out) The value that was parsed.
 */
PRBool
CSSParserImpl::ParseFunction(const nsString &aFunction,
                             const PRInt32 aAllowedTypes[],
                             PRUint16 aMinElems, PRUint16 aMaxElems,
                             nsCSSValue &aValue)
{
  typedef nsTArray<nsCSSValue>::size_type arrlen_t;

  /* 2^16 - 2, so that if we have 2^16 - 2 transforms, we have 2^16 - 1
   * elements stored in the the nsCSSValue::Array.
   */
  static const arrlen_t MAX_ALLOWED_ELEMS = 0xFFFE;

  /* Make a copy of the function name, since the reference is _probably_ to
   * mToken.mIdent, which is going to get overwritten during the course of this
   * function.
   */
  nsString functionName(aFunction);

  /* Read in a list of values as an nsTArray, failing if we can't or if
   * it's out of bounds.
   */
  nsTArray<nsCSSValue> foundValues;
  if (!ParseFunctionInternals(aAllowedTypes, aMinElems, aMaxElems,
                              foundValues))
    return PR_FALSE;
  
  /* Now, convert this nsTArray into an nsCSSValue::Array object.
   * We'll need N + 1 spots, one for the function name and the rest for the
   * arguments.  In case the user has given us more than 2^16 - 2 arguments,
   * we'll truncate them at 2^16 - 2 arguments.
   */
  PRUint16 numElements = (foundValues.Length() <= MAX_ALLOWED_ELEMS ?
                          foundValues.Length() + 1 : MAX_ALLOWED_ELEMS);
  nsRefPtr<nsCSSValue::Array> convertedArray =
    nsCSSValue::Array::Create(numElements);

  /* Copy things over. */
  convertedArray->Item(0).SetStringValue(functionName, eCSSUnit_Ident);
  for (PRUint16 index = 0; index + 1 < numElements; ++index)
    convertedArray->Item(index + 1) = foundValues[static_cast<arrlen_t>(index)];
  
  /* Fill in the outparam value with the array. */
  aValue.SetArrayValue(convertedArray, eCSSUnit_Function);
  
  /* Return it! */
  return PR_TRUE;
}

/**
 * Given a token, determines the minimum and maximum number of function
 * parameters to read, along with the mask that should be used to read
 * those function parameters.  If the token isn't a transform function,
 * returns an error.
 *
 * @param aToken The token identifying the function.
 * @param aMinElems [out] The minimum number of elements to read.
 * @param aMaxElems [out] The maximum number of elements to read
 * @param aVariantMask [out] The variant mask to use during parsing
 * @return Whether the information was loaded successfully.
 */
static PRBool GetFunctionParseInformation(nsCSSKeyword aToken,
                                          PRUint16 &aMinElems,
                                          PRUint16 &aMaxElems,
                                          const PRInt32 *& aVariantMask)
{
/* These types represent the common variant masks that will be used to
   * parse out the individual functions.  The order in the enumeration
   * must match the order in which the masks are declared.
   */
  enum { eLengthPercentCalc,
         eTwoLengthPercentCalcs,
         eAngle,
         eTwoAngles,
         eNumber,
         eTwoNumbers,
         eMatrix,
         eNumVariantMasks };
  static const PRInt32 kMaxElemsPerFunction = 6;
  static const PRInt32 kVariantMasks[eNumVariantMasks][kMaxElemsPerFunction] = {
    {VARIANT_TRANSFORM_LPCALC},
    {VARIANT_TRANSFORM_LPCALC, VARIANT_TRANSFORM_LPCALC},
    {VARIANT_ANGLE_OR_ZERO},
    {VARIANT_ANGLE_OR_ZERO, VARIANT_ANGLE_OR_ZERO},
    {VARIANT_NUMBER},
    {VARIANT_NUMBER, VARIANT_NUMBER},
    {VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER, VARIANT_NUMBER,
     VARIANT_TRANSFORM_LPCALC, VARIANT_TRANSFORM_LPCALC}};

#ifdef DEBUG
  static const PRUint8 kVariantMaskLengths[eNumVariantMasks] =
    {1, 2, 1, 2, 1, 2, 6};
#endif

  PRInt32 variantIndex = eNumVariantMasks;

  switch (aToken) {
  case eCSSKeyword_translatex:
  case eCSSKeyword_translatey:
    /* Exactly one length or percent. */
    variantIndex = eLengthPercentCalc;
    aMinElems = 1U;
    aMaxElems = 1U;
    break;
  case eCSSKeyword_scalex:
    /* Exactly one scale factor. */
    variantIndex = eNumber;
    aMinElems = 1U;
    aMaxElems = 1U;
    break;
  case eCSSKeyword_scaley:
    /* Exactly one scale factor. */
    variantIndex = eNumber;
    aMinElems = 1U;
    aMaxElems = 1U;
    break;
  case eCSSKeyword_rotate:
    /* Exactly one angle. */
    variantIndex = eAngle;
    aMinElems = 1U;
    aMaxElems = 1U;
    break;
  case eCSSKeyword_translate:
    /* One or two lengths or percents. */
    variantIndex = eTwoLengthPercentCalcs;
    aMinElems = 1U;
    aMaxElems = 2U;
    break;
  case eCSSKeyword_skew:
    /* Exactly one or two angles. */
    variantIndex = eTwoAngles;
    aMinElems = 1U;
    aMaxElems = 2U;
    break;
  case eCSSKeyword_scale:
    /* One or two scale factors. */
    variantIndex = eTwoNumbers;
    aMinElems = 1U;
    aMaxElems = 2U;
    break;
  case eCSSKeyword_skewx:
    /* Exactly one angle. */
    variantIndex = eAngle;
    aMinElems = 1U;
    aMaxElems = 1U;
    break;
  case eCSSKeyword_skewy:
    /* Exactly one angle. */
    variantIndex = eAngle;
    aMinElems = 1U;
    aMaxElems = 1U;
    break;
  case eCSSKeyword_matrix:
    /* Six values, which can be numbers, lengths, or percents. */
    variantIndex = eMatrix;
    aMinElems = 6U;
    aMaxElems = 6U;
    break;    
  default:
    /* Oh dear, we didn't match.  Report an error. */
    return PR_FALSE;
  }

  NS_ASSERTION(aMinElems > 0, "Didn't update minimum elements!");
  NS_ASSERTION(aMaxElems > 0, "Didn't update maximum elements!");
  NS_ASSERTION(aMinElems <= aMaxElems, "aMinElems > aMaxElems!");
  NS_ASSERTION(variantIndex >= 0, "Invalid variant mask!");
  NS_ASSERTION(variantIndex < eNumVariantMasks, "Invalid variant mask!");
#ifdef DEBUG
  NS_ASSERTION(aMaxElems <= kVariantMaskLengths[variantIndex],
               "Invalid aMaxElems for this variant mask.");
#endif

  // Convert the index into a mask.
  aVariantMask = kVariantMasks[variantIndex];

  return PR_TRUE;
}

/* Reads a single transform function from the tokenizer stream, reporting an
 * error if something goes wrong.
 */
PRBool
CSSParserImpl::ParseSingleTransform(nsCSSValue& aValue)
{
  if (!GetToken(PR_TRUE))
    return PR_FALSE;

  if (mToken.mType != eCSSToken_Function) {
    UngetToken();
    return PR_FALSE;
  }

  const PRInt32* variantMask;
  PRUint16 minElems, maxElems;
  if (!GetFunctionParseInformation(nsCSSKeywords::LookupKeyword(mToken.mIdent),
                                   minElems, maxElems, variantMask))
    return PR_FALSE;

  return ParseFunction(mToken.mIdent, variantMask, minElems, maxElems, aValue);
}

/* Parses a -moz-transform property list by continuously reading in properties
 * and constructing a matrix from it.
 */
PRBool CSSParserImpl::ParseMozTransform()
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT | VARIANT_NONE, nsnull)) {
    // 'inherit', 'initial', and 'none' must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList* cur = value.SetListValue();
    for (;;) {
      if (!ParseSingleTransform(cur->mValue)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(eCSSProperty__moz_transform, value);
  return PR_TRUE;
}

PRBool CSSParserImpl::ParseMozTransformOrigin()
{
  nsCSSValuePair position;
  if (!ParseBoxPositionValues(position, PR_TRUE) || !ExpectEndProperty())
    return PR_FALSE;

  // Unlike many other uses of pairs, this position should always be stored
  // as a pair, even if the values are the same, so it always serializes as
  // a pair, and to keep the computation code simple.
  if (position.mXValue.GetUnit() == eCSSUnit_Inherit ||
      position.mXValue.GetUnit() == eCSSUnit_Initial) {
    NS_ABORT_IF_FALSE(position.mXValue == position.mYValue,
                      "inherit/initial only half?");
    AppendValue(eCSSProperty__moz_transform_origin, position.mXValue);
  } else {
    nsCSSValue pair;
    pair.SetPairValue(&position);
    AppendValue(eCSSProperty__moz_transform_origin, pair);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseFamily(nsCSSValue& aValue)
{
  if (!GetToken(PR_TRUE))
    return PR_FALSE;

  if (eCSSToken_Ident == mToken.mType) {
    nsCSSKeyword keyword = nsCSSKeywords::LookupKeyword(mToken.mIdent);
    if (keyword == eCSSKeyword_inherit) {
      aValue.SetInheritValue();
      return PR_TRUE;
    }
    if (keyword == eCSSKeyword__moz_initial) {
      aValue.SetInitialValue();
      return PR_TRUE;
    }
    if (keyword == eCSSKeyword__moz_use_system_font &&
        !IsParsingCompoundProperty()) {
      aValue.SetSystemFontValue();
      return PR_TRUE;
    }
  }

  UngetToken();

  nsAutoString family;
  for (;;) {
    if (!ParseOneFamily(family))
      return PR_FALSE;

    if (!ExpectSymbol(',', PR_TRUE))
      break;

    family.Append(PRUnichar(','));
  }

  if (family.IsEmpty()) {
    return PR_FALSE;
  }
  aValue.SetStringValue(family, eCSSUnit_Families);
  return PR_TRUE;
}

// src: ( uri-src | local-src ) (',' ( uri-src | local-src ) )*
// uri-src: uri [ 'format(' string ( ',' string )* ')' ]
// local-src: 'local(' ( string | ident ) ')'

PRBool
CSSParserImpl::ParseFontSrc(nsCSSValue& aValue)
{
  // could we maybe turn nsCSSValue::Array into nsTArray<nsCSSValue>?
  nsTArray<nsCSSValue> values;
  nsCSSValue cur;
  for (;;) {
    if (!GetToken(PR_TRUE))
      break;

    if (mToken.mType == eCSSToken_Function &&
        mToken.mIdent.LowerCaseEqualsLiteral("url")) {
      if (!ParseURL(cur))
        return PR_FALSE;
      values.AppendElement(cur);
      if (!ParseFontSrcFormat(values))
        return PR_FALSE;

    } else if (mToken.mType == eCSSToken_Function &&
               mToken.mIdent.LowerCaseEqualsLiteral("local")) {
      // css3-fonts does not specify a formal grammar for local().
      // The text permits both unquoted identifiers and quoted
      // strings.  We resolve this ambiguity in the spec by
      // assuming that the appropriate production is a single
      // <family-name>, possibly surrounded by whitespace.

      nsAutoString family;
      if (!ParseOneFamily(family)) {
        SkipUntil(')');
        return PR_FALSE;
      }
      if (!ExpectSymbol(')', PR_TRUE)) {
        SkipUntil(')');
        return PR_FALSE;
      }

      // the style parameters to the nsFont constructor are ignored,
      // because it's only being used to call EnumerateFamilies
      nsFont font(family, 0, 0, 0, 0, 0, 0);
      ExtractFirstFamilyData dat;

      font.EnumerateFamilies(ExtractFirstFamily, (void*) &dat);
      if (!dat.mGood)
        return PR_FALSE;

      cur.SetStringValue(dat.mFamilyName, eCSSUnit_Local_Font);
      values.AppendElement(cur);
    } else {
      return PR_FALSE;
    }

    if (!ExpectSymbol(',', PR_TRUE))
      break;
  }

  if (values.Length() == 0)
    return PR_FALSE;

  nsRefPtr<nsCSSValue::Array> srcVals
    = nsCSSValue::Array::Create(mozilla::fallible_t(), values.Length());
  if (!srcVals) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  PRUint32 i;
  for (i = 0; i < values.Length(); i++)
    srcVals->Item(i) = values[i];
  aValue.SetArrayValue(srcVals, eCSSUnit_Array);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseFontSrcFormat(nsTArray<nsCSSValue> & values)
{
  if (!GetToken(PR_TRUE))
    return PR_TRUE; // EOF harmless here
  if (mToken.mType != eCSSToken_Function ||
      !mToken.mIdent.LowerCaseEqualsLiteral("format")) {
    UngetToken();
    return PR_TRUE;
  }

  do {
    if (!GetToken(PR_TRUE))
      return PR_FALSE; // EOF - no need for SkipUntil

    if (mToken.mType != eCSSToken_String) {
      UngetToken();
      SkipUntil(')');
      return PR_FALSE;
    }

    nsCSSValue cur(mToken.mIdent, eCSSUnit_Font_Format);
    values.AppendElement(cur);
  } while (ExpectSymbol(',', PR_TRUE));

  if (!ExpectSymbol(')', PR_TRUE)) {
    SkipUntil(')');
    return PR_FALSE;
  }

  return PR_TRUE;
}

// font-ranges: urange ( ',' urange )*
PRBool
CSSParserImpl::ParseFontRanges(nsCSSValue& aValue)
{
  nsTArray<PRUint32> ranges;
  for (;;) {
    if (!GetToken(PR_TRUE))
      break;

    if (mToken.mType != eCSSToken_URange) {
      UngetToken();
      break;
    }

    // An invalid range token is a parsing error, causing the entire
    // descriptor to be ignored.
    if (!mToken.mIntegerValid)
      return PR_FALSE;

    PRUint32 low = mToken.mInteger;
    PRUint32 high = mToken.mInteger2;

    // A range that descends, or a range that is entirely outside the
    // current range of Unicode (U+0-10FFFF) is ignored, but does not
    // invalidate the descriptor.  A range that straddles the high end
    // is clipped.
    if (low <= 0x10FFFF && low <= high) {
      if (high > 0x10FFFF)
        high = 0x10FFFF;

      ranges.AppendElement(low);
      ranges.AppendElement(high);
    }
    if (!ExpectSymbol(',', PR_TRUE))
      break;
  }

  if (ranges.Length() == 0)
    return PR_FALSE;

  nsRefPtr<nsCSSValue::Array> srcVals
    = nsCSSValue::Array::Create(mozilla::fallible_t(), ranges.Length());
  if (!srcVals) {
    mScanner.SetLowLevelError(NS_ERROR_OUT_OF_MEMORY);
    return PR_FALSE;
  }

  for (PRUint32 i = 0; i < ranges.Length(); i++)
    srcVals->Item(i).SetIntValue(ranges[i], eCSSUnit_Integer);
  aValue.SetArrayValue(srcVals, eCSSUnit_Array);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseListStyle()
{
  // 'list-style' can accept 'none' for two different subproperties,
  // 'list-style-type' and 'list-style-position'.  In order to accept
  // 'none' as the value of either but still allow another value for
  // either, we need to ensure that the first 'none' we find gets
  // allocated to a dummy property instead.
  static const nsCSSProperty listStyleIDs[] = {
    eCSSPropertyExtra_x_none_value,
    eCSSProperty_list_style_type,
    eCSSProperty_list_style_position,
    eCSSProperty_list_style_image
  };

  nsCSSValue values[NS_ARRAY_LENGTH(listStyleIDs)];
  PRInt32 found =
    ParseChoice(values, listStyleIDs, NS_ARRAY_LENGTH(listStyleIDs));
  if (found < 1 || !ExpectEndProperty()) {
    return PR_FALSE;
  }

  if ((found & (1|2|8)) == (1|2|8)) {
    if (values[0].GetUnit() == eCSSUnit_None) {
      // We found a 'none' plus another value for both of
      // 'list-style-type' and 'list-style-image'.  This is a parse
      // error, since the 'none' has to count for at least one of them.
      return PR_FALSE;
    } else {
      NS_ASSERTION(found == (1|2|4|8) && values[0] == values[1] &&
                   values[0] == values[2] && values[0] == values[3],
                   "should be a special value");
    }
  }

  // Provide default values
  if ((found & 2) == 0) {
    if (found & 1) {
      values[1].SetIntValue(NS_STYLE_LIST_STYLE_NONE, eCSSUnit_Enumerated);
    } else {
      values[1].SetIntValue(NS_STYLE_LIST_STYLE_DISC, eCSSUnit_Enumerated);
    }
  }
  if ((found & 4) == 0) {
    values[2].SetIntValue(NS_STYLE_LIST_STYLE_POSITION_OUTSIDE,
                          eCSSUnit_Enumerated);
  }
  if ((found & 8) == 0) {
    values[3].SetNoneValue();
  }

  // Start at 1 to avoid appending fake value.
  for (PRUint32 index = 1; index < NS_ARRAY_LENGTH(listStyleIDs); ++index) {
    AppendValue(listStyleIDs[index], values[index]);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseMargin()
{
  static const nsCSSProperty kMarginSideIDs[] = {
    eCSSProperty_margin_top,
    eCSSProperty_margin_right_value,
    eCSSProperty_margin_bottom,
    eCSSProperty_margin_left_value
  };
  static const nsCSSProperty kMarginSources[] = {
    eCSSProperty_margin_left_ltr_source,
    eCSSProperty_margin_left_rtl_source,
    eCSSProperty_margin_right_ltr_source,
    eCSSProperty_margin_right_rtl_source,
    eCSSProperty_UNKNOWN
  };

  // do this now, in case 4 values weren't specified
  InitBoxPropsAsPhysical(kMarginSources);
  return ParseBoxProperties(kMarginSideIDs);
}

PRBool
CSSParserImpl::ParseMarks(nsCSSValue& aValue)
{
  if (ParseVariant(aValue, VARIANT_HK, nsCSSProps::kPageMarksKTable)) {
    if (eCSSUnit_Enumerated == aValue.GetUnit()) {
      if (NS_STYLE_PAGE_MARKS_NONE != aValue.GetIntValue() &&
          PR_FALSE == CheckEndProperty()) {
        nsCSSValue second;
        if (ParseEnum(second, nsCSSProps::kPageMarksKTable)) {
          // 'none' keyword in conjuction with others is not allowed
          if (NS_STYLE_PAGE_MARKS_NONE != second.GetIntValue()) {
            aValue.SetIntValue(aValue.GetIntValue() | second.GetIntValue(),
                               eCSSUnit_Enumerated);
            return PR_TRUE;
          }
        }
        return PR_FALSE;
      }
    }
    return PR_TRUE;
  }
  return PR_FALSE;
}

PRBool
CSSParserImpl::ParseOutline()
{
  const PRInt32 numProps = 3;
  static const nsCSSProperty kOutlineIDs[] = {
    eCSSProperty_outline_color,
    eCSSProperty_outline_style,
    eCSSProperty_outline_width
  };

  nsCSSValue  values[numProps];
  PRInt32 found = ParseChoice(values, kOutlineIDs, numProps);
  if ((found < 1) || (PR_FALSE == ExpectEndProperty())) {
    return PR_FALSE;
  }

  // Provide default values
  if ((found & 1) == 0) { // Provide default outline-color
#ifdef GFX_HAS_INVERT
    values[0].SetIntValue(NS_STYLE_COLOR_INVERT, eCSSUnit_Enumerated);
#else
    values[0].SetIntValue(NS_STYLE_COLOR_MOZ_USE_TEXT_COLOR, eCSSUnit_Enumerated);
#endif
  }
  if ((found & 2) == 0) { // Provide default outline-style
    values[1].SetIntValue(NS_STYLE_BORDER_STYLE_NONE, eCSSUnit_Enumerated);
  }
  if ((found & 4) == 0) { // Provide default outline-width
    values[2].SetIntValue(NS_STYLE_BORDER_WIDTH_MEDIUM, eCSSUnit_Enumerated);
  }

  PRInt32 index;
  for (index = 0; index < numProps; index++) {
    AppendValue(kOutlineIDs[index], values[index]);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseOverflow()
{
  nsCSSValue overflow;
  if (!ParseVariant(overflow, VARIANT_HK,
                    nsCSSProps::kOverflowKTable) ||
      !ExpectEndProperty())
    return PR_FALSE;

  nsCSSValue overflowX(overflow);
  nsCSSValue overflowY(overflow);
  if (eCSSUnit_Enumerated == overflow.GetUnit())
    switch(overflow.GetIntValue()) {
      case NS_STYLE_OVERFLOW_SCROLLBARS_HORIZONTAL:
        overflowX.SetIntValue(NS_STYLE_OVERFLOW_SCROLL, eCSSUnit_Enumerated);
        overflowY.SetIntValue(NS_STYLE_OVERFLOW_HIDDEN, eCSSUnit_Enumerated);
        break;
      case NS_STYLE_OVERFLOW_SCROLLBARS_VERTICAL:
        overflowX.SetIntValue(NS_STYLE_OVERFLOW_HIDDEN, eCSSUnit_Enumerated);
        overflowY.SetIntValue(NS_STYLE_OVERFLOW_SCROLL, eCSSUnit_Enumerated);
        break;
    }
  AppendValue(eCSSProperty_overflow_x, overflowX);
  AppendValue(eCSSProperty_overflow_y, overflowY);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParsePadding()
{
  static const nsCSSProperty kPaddingSideIDs[] = {
    eCSSProperty_padding_top,
    eCSSProperty_padding_right_value,
    eCSSProperty_padding_bottom,
    eCSSProperty_padding_left_value
  };
  static const nsCSSProperty kPaddingSources[] = {
    eCSSProperty_padding_left_ltr_source,
    eCSSProperty_padding_left_rtl_source,
    eCSSProperty_padding_right_ltr_source,
    eCSSProperty_padding_right_rtl_source,
    eCSSProperty_UNKNOWN
  };

  // do this now, in case 4 values weren't specified
  InitBoxPropsAsPhysical(kPaddingSources);
  return ParseBoxProperties(kPaddingSideIDs);
}

PRBool
CSSParserImpl::ParsePause()
{
  nsCSSValue  before;
  if (ParseSingleValueProperty(before, eCSSProperty_pause_before)) {
    if (eCSSUnit_Inherit != before.GetUnit() && eCSSUnit_Initial != before.GetUnit()) {
      nsCSSValue after;
      if (ParseSingleValueProperty(after, eCSSProperty_pause_after)) {
        if (ExpectEndProperty()) {
          AppendValue(eCSSProperty_pause_before, before);
          AppendValue(eCSSProperty_pause_after, after);
          return PR_TRUE;
        }
        return PR_FALSE;
      }
    }
    if (ExpectEndProperty()) {
      AppendValue(eCSSProperty_pause_before, before);
      AppendValue(eCSSProperty_pause_after, before);
      return PR_TRUE;
    }
  }
  return PR_FALSE;
}

PRBool
CSSParserImpl::ParseQuotes()
{
  nsCSSValue value;
  if (!ParseVariant(value, VARIANT_HOS, nsnull)) {
    return PR_FALSE;
  }
  if (value.GetUnit() != eCSSUnit_String) {
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValue open = value;
    nsCSSValuePairList* quotes = value.SetPairListValue();
    for (;;) {
      quotes->mXValue = open;
      // get mandatory close
      if (!ParseVariant(quotes->mYValue, VARIANT_STRING, nsnull)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      // look for another open
      if (!ParseVariant(open, VARIANT_STRING, nsnull)) {
        return PR_FALSE;
      }
      quotes->mNext = new nsCSSValuePairList;
      quotes = quotes->mNext;
    }
  }
  AppendValue(eCSSProperty_quotes, value);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseSize()
{
  nsCSSValue width, height;
  if (!ParseVariant(width, VARIANT_AHKL, nsCSSProps::kPageSizeKTable)) {
    return PR_FALSE;
  }
  if (width.IsLengthUnit()) {
    ParseVariant(height, VARIANT_LENGTH, nsnull);
  }
  if (!ExpectEndProperty()) {
    return PR_FALSE;
  }

  if (width == height || height.GetUnit() == eCSSUnit_Null) {
    AppendValue(eCSSProperty_size, width);
  } else {
    nsCSSValue pair;
    pair.SetPairValue(width, height);
    AppendValue(eCSSProperty_size, pair);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseTextDecoration(nsCSSValue& aValue)
{
  if (ParseVariant(aValue, VARIANT_HK, nsCSSProps::kTextDecorationKTable)) {
    if (eCSSUnit_Enumerated == aValue.GetUnit()) {
      PRInt32 intValue = aValue.GetIntValue();
      if (intValue != NS_STYLE_TEXT_DECORATION_NONE) {
        // look for more keywords
        nsCSSValue  keyword;
        PRInt32 index;
        for (index = 0; index < 3; index++) {
          if (ParseEnum(keyword, nsCSSProps::kTextDecorationKTable)) {
            PRInt32 newValue = keyword.GetIntValue();
            if (newValue == NS_STYLE_TEXT_DECORATION_NONE ||
                newValue & intValue) {
              // 'none' keyword in conjuction with others is not allowed, and
              // duplicate keyword is not allowed.
              return PR_FALSE;
            }
            intValue |= newValue;
          }
          else {
            break;
          }
        }
        aValue.SetIntValue(intValue, eCSSUnit_Enumerated);
      }
    }
    return PR_TRUE;
  }
  return PR_FALSE;
}


PRBool
CSSParserImpl::ParseTransitionTime(nsCSSProperty aPropID)
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT, nsnull)) {
    // 'inherit' and 'initial' must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList* cur = value.SetListValue();
    for (;;) {
      if (!ParseVariant(cur->mValue, VARIANT_TIME, nsnull)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      if (!ExpectSymbol(',', PR_TRUE)) {
        return PR_FALSE;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(aPropID, value);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseTransitionProperty()
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT | VARIANT_NONE | VARIANT_ALL,
                   nsnull)) {
    // 'inherit', 'initial', 'none', and 'all' must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    // Accept a list of arbitrary identifiers.  They should be
    // CSS properties, but we want to accept any so that we
    // accept properties that we don't know about yet, e.g.
    // transition-property: invalid-property, left, opacity;
    nsCSSValueList* cur = value.SetListValue();
    for (;;) {
      if (!ParseVariant(cur->mValue, VARIANT_IDENTIFIER, nsnull)) {
        return PR_FALSE;
      }
      nsDependentString str(cur->mValue.GetStringBufferValue());
      // Exclude 'none' and 'all' and 'inherit' and 'initial'
      // according to the same rules as for 'counter-reset' in CSS 2.1
      // (except 'counter-reset' doesn't exclude 'all' since it
      // doesn't support 'all' as a special value).
      if (str.LowerCaseEqualsLiteral("none") ||
          str.LowerCaseEqualsLiteral("all") ||
          str.LowerCaseEqualsLiteral("inherit") ||
          str.LowerCaseEqualsLiteral("initial")) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      if (!ExpectSymbol(',', PR_TRUE)) {
        REPORT_UNEXPECTED_TOKEN(PEExpectedComma);
        return PR_FALSE;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(eCSSProperty_transition_property, value);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseTransitionTimingFunction()
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT, nsnull)) {
    // 'inherit' and 'initial' must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList* cur = value.SetListValue();
    for (;;) {
      if (!ParseVariant(cur->mValue, VARIANT_TIMING_FUNCTION,
                        nsCSSProps::kTransitionTimingFunctionKTable)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      if (!ExpectSymbol(',', PR_TRUE)) {
        return PR_FALSE;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(eCSSProperty_transition_timing_function, value);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseTransitionTimingFunctionValues(nsCSSValue& aValue)
{
  NS_ASSERTION(!mHavePushBack &&
               mToken.mType == eCSSToken_Function &&
               mToken.mIdent.LowerCaseEqualsLiteral("cubic-bezier"),
               "unexpected initial state");

  nsRefPtr<nsCSSValue::Array> val = nsCSSValue::Array::Create(4);

  float x1, x2, y1, y2;
  if (!ParseTransitionTimingFunctionValueComponent(x1, ',', PR_TRUE) ||
      !ParseTransitionTimingFunctionValueComponent(y1, ',', PR_FALSE) ||
      !ParseTransitionTimingFunctionValueComponent(x2, ',', PR_TRUE) ||
      !ParseTransitionTimingFunctionValueComponent(y2, ')', PR_FALSE)) {
    return PR_FALSE;
  }

  val->Item(0).SetFloatValue(x1, eCSSUnit_Number);
  val->Item(1).SetFloatValue(y1, eCSSUnit_Number);
  val->Item(2).SetFloatValue(x2, eCSSUnit_Number);
  val->Item(3).SetFloatValue(y2, eCSSUnit_Number);

  aValue.SetArrayValue(val, eCSSUnit_Cubic_Bezier);

  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseTransitionTimingFunctionValueComponent(float& aComponent,
                                                           char aStop,
                                                           PRBool aCheckRange)
{
  if (!GetToken(PR_TRUE)) {
    return PR_FALSE;
  }
  nsCSSToken* tk = &mToken;
  if (tk->mType == eCSSToken_Number) {
    float num = tk->mNumber;
    if (aCheckRange && (num < 0.0 || num > 1.0)) {
      return PR_FALSE;
    }
    aComponent = num;
    if (ExpectSymbol(aStop, PR_TRUE)) {
      return PR_TRUE;
    }
  }
  return PR_FALSE;
}

static nsCSSValueList*
AppendValueToList(nsCSSValue& aContainer,
                  nsCSSValueList* aTail,
                  const nsCSSValue& aValue)
{
  nsCSSValueList* entry;
  if (aContainer.GetUnit() == eCSSUnit_Null) {
    NS_ABORT_IF_FALSE(!aTail, "should not have an entry");
    entry = aContainer.SetListValue();
  } else {
    NS_ABORT_IF_FALSE(!aTail->mNext, "should not have a next entry");
    NS_ABORT_IF_FALSE(aContainer.GetUnit() == eCSSUnit_List, "not a list");
    entry = new nsCSSValueList;
    aTail->mNext = entry;
  }
  entry->mValue = aValue;
  return entry;
}

PRBool
CSSParserImpl::ParseTransition()
{
  static const nsCSSProperty kTransitionProperties[] = {
    eCSSProperty_transition_duration,
    eCSSProperty_transition_timing_function,
    // Must check 'transition-delay' after 'transition-duration', since
    // that's our assumption about what the spec means for the shorthand
    // syntax (the first time given is the duration, and the second
    // given is the delay).
    eCSSProperty_transition_delay,
    // Must check 'transition-property' after
    // 'transition-timing-function' since 'transition-property' accepts
    // any keyword.
    eCSSProperty_transition_property
  };
  static const PRUint32 numProps = NS_ARRAY_LENGTH(kTransitionProperties);
  // this is a shorthand property that accepts -property, -delay,
  // -duration, and -timing-function with some components missing.
  // there can be multiple transitions, separated with commas

  nsCSSValue tempValue;
  // first see if 'inherit' or '-moz-initial' is specified.  If one is,
  // it can be the only thing specified, so don't attempt to parse any
  // additional properties
  if (ParseVariant(tempValue, VARIANT_INHERIT, nsnull)) {
    for (PRUint32 i = 0; i < numProps; ++i) {
      AppendValue(kTransitionProperties[i], tempValue);
    }
    return PR_TRUE;
  }

  nsCSSValue values[numProps];
  nsCSSValueList *cur[numProps] = { nsnull, nsnull, nsnull, nsnull };
  PRBool atEOP = PR_FALSE; // at end of property?
  for (;;) { // loop over comma-separated transitions
    // whether a particular subproperty was specified for this transition
    PRBool parsedProperty[numProps] =
      { PR_FALSE, PR_FALSE, PR_FALSE, PR_FALSE };
    for (;;) { // loop over values within a transition
      PRBool foundProperty = PR_FALSE;
      // check to see if we're at the end of one full transition definition
      // (either because we hit a comma or because we hit the end of the
      // property definition)
      if (ExpectSymbol(',', PR_TRUE))
        break;
      if (CheckEndProperty()) {
        atEOP = PR_TRUE;
        break;
      }

      // else, try to parse the next transition sub-property
      for (PRUint32 i = 0; !foundProperty && i < numProps; ++i) {
        if (!parsedProperty[i]) {
          // if we haven't found this property yet, try to parse it
          PRInt32 variantMask;
          const PRInt32* table = nsnull;
          switch (kTransitionProperties[i]) {
            case eCSSProperty_transition_property:
              variantMask = VARIANT_IDENTIFIER | VARIANT_NONE | VARIANT_ALL;
              break;
            case eCSSProperty_transition_duration:
            case eCSSProperty_transition_delay:
              variantMask = VARIANT_TIME;
              break;
            case eCSSProperty_transition_timing_function:
              variantMask = VARIANT_TIMING_FUNCTION;
              table = nsCSSProps::kTransitionTimingFunctionKTable;
              break;
            default:
              NS_ABORT_IF_FALSE(PR_FALSE, "Invalid transition property");
          }
          if (ParseVariant(tempValue, variantMask, table)) {
            parsedProperty[i] = PR_TRUE;
            cur[i] = AppendValueToList(values[i], cur[i], tempValue);
            foundProperty = PR_TRUE;
            break; // out of inner loop; continue looking for next sub-property
          }
        }
      }
      if (!foundProperty) {
        // We're not at a ',' or at the end of the property, but we couldn't
        // parse any of the sub-properties, so the declaration is invalid.
        return PR_FALSE;
      }
    }

    // We hit the end of the property or the end of one transition
    // definition, add its components to the list.
    for (PRUint32 i = 0; i < numProps; ++i) {
      // If all of the subproperties were not explicitly specified, fill
      // in the missing ones with initial values.
      if (!parsedProperty[i]) {
        switch (kTransitionProperties[i]) {
          case eCSSProperty_transition_property:
            tempValue.SetAllValue();
            break;
          case eCSSProperty_transition_duration:
          case eCSSProperty_transition_delay:
            tempValue.SetFloatValue(0.0, eCSSUnit_Seconds);
            break;
          case eCSSProperty_transition_timing_function:
            tempValue.SetIntValue(NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE,
                                  eCSSUnit_Enumerated);
            break;
          default:
            NS_ABORT_IF_FALSE(PR_FALSE, "Invalid transition property");
        }
        cur[i] = AppendValueToList(values[i], cur[i], tempValue);
      }
    }

    if (atEOP)
      break;
    // else we just hit a ',' so continue parsing the next compound transition
  }

  // Make two checks on the list for 'transition-property':
  //   + If there is more than one item, then none of the items can be
  //     'none' or 'all'.
  //   + None of the items can be 'inherit' or 'initial' (this is the case,
  //     like with counter-reset &c., where CSS 2.1 specifies 'initial', so
  //     we should check it without the -moz- prefix).
  {
    NS_ABORT_IF_FALSE(kTransitionProperties[3] ==
                        eCSSProperty_transition_property,
                      "array index mismatch");
    nsCSSValueList *l = values[3].GetListValue();
    PRBool multipleItems = !!l->mNext;
    do {
      const nsCSSValue& val = l->mValue;
      if (val.GetUnit() != eCSSUnit_Ident) {
        NS_ABORT_IF_FALSE(val.GetUnit() == eCSSUnit_None ||
                          val.GetUnit() == eCSSUnit_All, "unexpected unit");
        if (multipleItems) {
          // This is a syntax error.
          return PR_FALSE;
        }

        // Unbox a solitary 'none' or 'all'.
        if (val.GetUnit() == eCSSUnit_None) {
          values[3].SetNoneValue();
        } else {
          values[3].SetAllValue();
        }
        break;
      }
      nsDependentString str(val.GetStringBufferValue());
      if (str.EqualsLiteral("inherit") || str.EqualsLiteral("initial")) {
        return PR_FALSE;
      }
    } while ((l = l->mNext));
  }

  // Save all parsed transition sub-properties in mTempData
  for (PRUint32 i = 0; i < numProps; ++i) {
    AppendValue(kTransitionProperties[i], values[i]);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseShadowItem(nsCSSValue& aValue, PRBool aIsBoxShadow)
{
  // A shadow list item is an array, with entries in this sequence:
  enum {
    IndexX,
    IndexY,
    IndexRadius,
    IndexSpread,  // only for box-shadow
    IndexColor,
    IndexInset    // only for box-shadow
  };

  nsRefPtr<nsCSSValue::Array> val = nsCSSValue::Array::Create(6);

  if (aIsBoxShadow) {
    // Optional inset keyword (ignore errors)
    ParseVariant(val->Item(IndexInset), VARIANT_KEYWORD,
                 nsCSSProps::kBoxShadowTypeKTable);
  }

  nsCSSValue xOrColor;
  PRBool haveColor = PR_FALSE;
  if (!ParseVariant(xOrColor, VARIANT_COLOR | VARIANT_LENGTH | VARIANT_CALC,
                    nsnull)) {
    return PR_FALSE;
  }
  if (xOrColor.IsLengthUnit() || xOrColor.IsCalcUnit()) {
    val->Item(IndexX) = xOrColor;
  } else {
    // Must be a color (as string or color value)
    NS_ASSERTION(xOrColor.GetUnit() == eCSSUnit_Ident ||
                 xOrColor.GetUnit() == eCSSUnit_Color ||
                 xOrColor.GetUnit() == eCSSUnit_EnumColor,
                 "Must be a color value");
    val->Item(IndexColor) = xOrColor;
    haveColor = PR_TRUE;

    // X coordinate mandatory after color
    if (!ParseVariant(val->Item(IndexX), VARIANT_LENGTH | VARIANT_CALC,
                      nsnull)) {
      return PR_FALSE;
    }
  }

  // Y coordinate; mandatory
  if (!ParseVariant(val->Item(IndexY), VARIANT_LENGTH | VARIANT_CALC,
                    nsnull)) {
    return PR_FALSE;
  }

  // Optional radius. Ignore errors except if they pass a negative
  // value which we must reject. If we use ParseNonNegativeVariant
  // we can't tell the difference between an unspecified radius
  // and a negative radius.
  if (ParseVariant(val->Item(IndexRadius), VARIANT_LENGTH | VARIANT_CALC,
                   nsnull) &&
      val->Item(IndexRadius).IsLengthUnit() &&
      val->Item(IndexRadius).GetFloatValue() < 0) {
    return PR_FALSE;
  }

  if (aIsBoxShadow) {
    // Optional spread
    ParseVariant(val->Item(IndexSpread), VARIANT_LENGTH | VARIANT_CALC, nsnull);
  }

  if (!haveColor) {
    // Optional color
    ParseVariant(val->Item(IndexColor), VARIANT_COLOR, nsnull);
  }

  if (aIsBoxShadow && val->Item(IndexInset).GetUnit() == eCSSUnit_Null) {
    // Optional inset keyword
    ParseVariant(val->Item(IndexInset), VARIANT_KEYWORD,
                 nsCSSProps::kBoxShadowTypeKTable);
  }

  aValue.SetArrayValue(val, eCSSUnit_Array);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseShadowList(nsCSSProperty aProperty)
{
  nsAutoParseCompoundProperty compound(this);
  PRBool isBoxShadow = aProperty == eCSSProperty_box_shadow;

  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT | VARIANT_NONE, nsnull)) {
    // 'inherit', 'initial', and 'none' must be alone
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList* cur = value.SetListValue();
    for (;;) {
      if (!ParseShadowItem(cur->mValue, isBoxShadow)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      if (!ExpectSymbol(',', PR_TRUE)) {
        return PR_FALSE;
      }
      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(aProperty, value);
  return PR_TRUE;
}

PRInt32
CSSParserImpl::GetNamespaceIdForPrefix(const nsString& aPrefix)
{
  NS_PRECONDITION(!aPrefix.IsEmpty(), "Must have a prefix here");

  PRInt32 nameSpaceID = kNameSpaceID_Unknown;
  if (mNameSpaceMap) {
    // user-specified identifiers are case-sensitive (bug 416106)
    nsCOMPtr<nsIAtom> prefix = do_GetAtom(aPrefix);
    nameSpaceID = mNameSpaceMap->FindNameSpaceID(prefix);
  }
  // else no declared namespaces

  if (nameSpaceID == kNameSpaceID_Unknown) {   // unknown prefix, dump it
    const PRUnichar *params[] = {
      aPrefix.get()
    };
    REPORT_UNEXPECTED_P(PEUnknownNamespacePrefix, params);
    mFoundUnresolvablePrefix = PR_TRUE;
  }

  return nameSpaceID;
}

void
CSSParserImpl::SetDefaultNamespaceOnSelector(nsCSSSelector& aSelector)
{
  if (mNameSpaceMap) {
    aSelector.SetNameSpace(mNameSpaceMap->FindNameSpaceID(nsnull));
  } else {
    aSelector.SetNameSpace(kNameSpaceID_Unknown); // wildcard
  }
}

#ifdef MOZ_SVG
PRBool
CSSParserImpl::ParsePaint(nsCSSProperty aPropID)
{
  nsCSSValue x, y;
  if (!ParseVariant(x, VARIANT_HC | VARIANT_NONE | VARIANT_URL, nsnull))
    return PR_FALSE;
  if (x.GetUnit() == eCSSUnit_URL) {
    if (!ParseVariant(y, VARIANT_COLOR | VARIANT_NONE, nsnull))
      y.SetColorValue(NS_RGB(0, 0, 0));
  }
  if (!ExpectEndProperty())
    return PR_FALSE;

  if (x.GetUnit() != eCSSUnit_URL) {
    AppendValue(aPropID, x);
  } else {
    nsCSSValue val;
    val.SetPairValue(x, y);
    AppendValue(aPropID, val);
  }
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseDasharray()
{
  nsCSSValue value;
  if (ParseVariant(value, VARIANT_INHERIT | VARIANT_NONE, nsnull)) {
    // 'inherit', 'initial', and 'none' are only allowed on their own
    if (!ExpectEndProperty()) {
      return PR_FALSE;
    }
  } else {
    nsCSSValueList *cur = value.SetListValue();
    for (;;) {
      if (!ParseNonNegativeVariant(cur->mValue, VARIANT_LPN, nsnull)) {
        return PR_FALSE;
      }
      if (CheckEndProperty()) {
        break;
      }
      // skip optional commas between elements
      (void)ExpectSymbol(',', PR_TRUE);

      cur->mNext = new nsCSSValueList;
      cur = cur->mNext;
    }
  }
  AppendValue(eCSSProperty_stroke_dasharray, value);
  return PR_TRUE;
}

PRBool
CSSParserImpl::ParseMarker()
{
  nsCSSValue marker;
  if (ParseSingleValueProperty(marker, eCSSProperty_marker_end)) {
    if (ExpectEndProperty()) {
      AppendValue(eCSSProperty_marker_end, marker);
      AppendValue(eCSSProperty_marker_mid, marker);
      AppendValue(eCSSProperty_marker_start, marker);
      return PR_TRUE;
    }
  }
  return PR_FALSE;
}
#endif

} // anonymous namespace

// Recycling of parser implementation objects

static CSSParserImpl* gFreeList = nsnull;

nsCSSParser::nsCSSParser(mozilla::css::Loader* aLoader,
                         nsCSSStyleSheet* aSheet)
{
  CSSParserImpl *impl = gFreeList;
  if (impl) {
    gFreeList = impl->mNextFree;
    impl->mNextFree = nsnull;
  } else {
    impl = new CSSParserImpl();
  }

  if (aLoader) {
    impl->SetChildLoader(aLoader);
    impl->SetQuirkMode(aLoader->GetCompatibilityMode() ==
                       eCompatibility_NavQuirks);
  }
  if (aSheet) {
    impl->SetStyleSheet(aSheet);
  }

  mImpl = static_cast<void*>(impl);
}

nsCSSParser::~nsCSSParser()
{
  CSSParserImpl *impl = static_cast<CSSParserImpl*>(mImpl);
  impl->Reset();
  impl->mNextFree = gFreeList;
  gFreeList = impl;
}

/* static */ void
nsCSSParser::Shutdown()
{
  CSSParserImpl *tofree = gFreeList;
  CSSParserImpl *next;
  while (tofree)
    {
      next = tofree->mNextFree;
      delete tofree;
      tofree = next;
    }
}

// Wrapper methods

nsresult
nsCSSParser::SetStyleSheet(nsCSSStyleSheet* aSheet)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    SetStyleSheet(aSheet);
}

nsresult
nsCSSParser::SetQuirkMode(PRBool aQuirkMode)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    SetQuirkMode(aQuirkMode);
}

#ifdef  MOZ_SVG
nsresult
nsCSSParser::SetSVGMode(PRBool aSVGMode)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    SetSVGMode(aSVGMode);
}
#endif

nsresult
nsCSSParser::SetChildLoader(mozilla::css::Loader* aChildLoader)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    SetChildLoader(aChildLoader);
}

nsresult
nsCSSParser::Parse(nsIUnicharInputStream* aInput,
                   nsIURI*                aSheetURI,
                   nsIURI*                aBaseURI,
                   nsIPrincipal*          aSheetPrincipal,
                   PRUint32               aLineNumber,
                   PRBool                 aAllowUnsafeRules)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    Parse(aInput, aSheetURI, aBaseURI, aSheetPrincipal, aLineNumber,
          aAllowUnsafeRules);
}

nsresult
nsCSSParser::ParseStyleAttribute(const nsAString&  aAttributeValue,
                                 nsIURI*           aDocURI,
                                 nsIURI*           aBaseURI,
                                 nsIPrincipal*     aNodePrincipal,
                                 nsICSSStyleRule** aResult)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    ParseStyleAttribute(aAttributeValue, aDocURI, aBaseURI,
                        aNodePrincipal, aResult);
}

nsresult
nsCSSParser::ParseDeclarations(const nsAString&  aBuffer,
                               nsIURI*           aSheetURI,
                               nsIURI*           aBaseURI,
                               nsIPrincipal*     aSheetPrincipal,
                               css::Declaration* aDeclaration,
                               PRBool*           aChanged)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    ParseDeclarations(aBuffer, aSheetURI, aBaseURI, aSheetPrincipal,
                      aDeclaration, aChanged);
}

nsresult
nsCSSParser::ParseRule(const nsAString&        aRule,
                       nsIURI*                 aSheetURI,
                       nsIURI*                 aBaseURI,
                       nsIPrincipal*           aSheetPrincipal,
                       nsCOMArray<nsICSSRule>& aResult)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    ParseRule(aRule, aSheetURI, aBaseURI, aSheetPrincipal, aResult);
}

nsresult
nsCSSParser::ParseProperty(const nsCSSProperty aPropID,
                           const nsAString&    aPropValue,
                           nsIURI*             aSheetURI,
                           nsIURI*             aBaseURI,
                           nsIPrincipal*       aSheetPrincipal,
                           css::Declaration*   aDeclaration,
                           PRBool*             aChanged,
                           PRBool              aIsImportant)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    ParseProperty(aPropID, aPropValue, aSheetURI, aBaseURI,
                  aSheetPrincipal, aDeclaration, aChanged, aIsImportant);
}

nsresult
nsCSSParser::ParseMediaList(const nsSubstring& aBuffer,
                            nsIURI*            aURI,
                            PRUint32           aLineNumber,
                            nsMediaList*       aMediaList,
                            PRBool             aHTMLMode)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    ParseMediaList(aBuffer, aURI, aLineNumber, aMediaList, aHTMLMode);
}

nsresult
nsCSSParser::ParseColorString(const nsSubstring& aBuffer,
                              nsIURI*            aURI,
                              PRUint32           aLineNumber,
                              nscolor*           aColor)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    ParseColorString(aBuffer, aURI, aLineNumber, aColor);
}

nsresult
nsCSSParser::ParseSelectorString(const nsSubstring&  aSelectorString,
                                 nsIURI*             aURI,
                                 PRUint32            aLineNumber,
                                 nsCSSSelectorList** aSelectorList)
{
  return static_cast<CSSParserImpl*>(mImpl)->
    ParseSelectorString(aSelectorString, aURI, aLineNumber, aSelectorList);
}
