/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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):
 *   Gagan Saksena <gagan@netscape.com> (original author)
 *   Darin Fisher <darin@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either 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
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 * 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 ***** */

#include "nsISupports.idl"

/**
 * URIs are essentially structured names for things -- anything. This interface
 * provides accessors to set and query the most basic components of an URI.
 * Subclasses, including nsIURL, impose greater structure on the URI.
 *
 * This interface follows Tim Berners-Lee's URI spec (RFC2396) [1], where the
 * basic URI components are defined as such:
 * <pre> 
 *      ftp://username:password@hostname:portnumber/pathname
 *      \ /   \               / \      / \        /\       /
 *       -     ---------------   ------   --------  -------
 *       |            |             |        |         |
 *       |            |             |        |        Path
 *       |            |             |       Port         
 *       |            |            Host      /
 *       |         UserPass                 /
 *     Scheme                              /
 *       \                                /
 *        --------------------------------
 *                       |
 *                    PrePath
 * </pre>
 * The definition of the URI components has been extended to allow for
 * internationalized domain names [2] and the more generic IRI structure [3].
 *
 * [1] http://www.ietf.org/rfc/rfc2396.txt
 * [2] http://www.ietf.org/internet-drafts/draft-ietf-idn-idna-06.txt
 * [3] http://www.ietf.org/internet-drafts/draft-masinter-url-i18n-08.txt
 */

%{C++
#undef GetPort  // XXX Windows!
#undef SetPort  // XXX Windows!
%}

/**
 * nsIURI - interface for an uniform resource identifier w/ i18n support.
 *
 * AUTF8String attributes may contain unescaped UTF-8 characters.
 * Consumers should be careful to escape the UTF-8 strings as necessary, but
 * should always try to "display" the UTF-8 version as provided by this
 * interface.
 *
 * AUTF8String attributes may also contain escaped characters.
 * 
 * Unescaping URI segments is unadvised unless there is intimate
 * knowledge of the underlying charset or there is no plan to display (or
 * otherwise enforce a charset on) the resulting URI substring.
 *
 * The correct way to create an nsIURI from a string is via
 * nsIIOService.newURI.
 */
[scriptable, uuid(07a22cc0-0ce5-11d3-9331-00104ba0fd40)]
interface nsIURI : nsISupports
{
    /************************************************************************
     * The URI is broken down into the following principal components:
     */

    /**
     * Returns a string representation of the URI. Setting the spec causes
     * the new spec to be parsed per the rules for the scheme the URI
     * currently has.  In particular, setting the spec to a URI string with a
     * different scheme will generally produce incorrect results; no one
     * outside of a protocol handler implementation should be doing that.  If
     * the URI stores information from the nsIIOService.newURI call used to
     * create it other than just the parsed string, then behavior of this
     * information on setting the spec attribute is undefined.
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String spec;

    /**
     * The prePath (eg. scheme://user:password@host:port) returns the string
     * before the path.  This is useful for authentication or managing sessions.
     *
     * Some characters may be escaped.
     */
    readonly attribute AUTF8String prePath;

    /**
     * The Scheme is the protocol to which this URI refers.  The scheme is
     * restricted to the US-ASCII charset per RFC2396.  Setting this is
     * highly discouraged outside of a protocol handler implementation, since
     * that will generally lead to incorrect results.
     */
    attribute ACString scheme;

    /**
     * The username:password (or username only if value doesn't contain a ':')
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String userPass;

    /**
     * The optional username and password, assuming the preHost consists of
     * username:password.
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String username;
    attribute AUTF8String password;

    /**
     * The host:port (or simply the host, if port == -1).
     *
     * Characters are NOT escaped.
     */
    attribute AUTF8String hostPort;

    /**
     * The host is the internet domain name to which this URI refers.  It could
     * be an IPv4 (or IPv6) address literal.  If supported, it could be a
     * non-ASCII internationalized domain name.
     *
     * Characters are NOT escaped.
     */
    attribute AUTF8String host;

    /**
     * A port value of -1 corresponds to the protocol's default port (eg. -1
     * implies port 80 for http URIs).
     */
    attribute long port;

    /**
     * The path, typically including at least a leading '/' (but may also be
     * empty, depending on the protocol).
     *
     * Some characters may be escaped.
     */
    attribute AUTF8String path;


    /************************************************************************
     * An URI supports the following methods:
     */

    /**
     * URI equivalence test (not a strict string comparison).
     *
     * eg. http://foo.com:80/ == http://foo.com/
     */
    boolean equals(in nsIURI other);

    /**
     * An optimization to do scheme checks without requiring the users of nsIURI
     * to GetScheme, thereby saving extra allocating and freeing. Returns true if
     * the schemes match (case ignored).
     */
    boolean schemeIs(in string scheme);

    /**
     * Clones the current URI.  For some protocols, this is more than just an
     * optimization.  For example, under MacOS, the spec of a file URL does not
     * necessarily uniquely identify a file since two volumes could share the
     * same name.
     */
    nsIURI clone();

    /**
     * This method resolves a relative string into an absolute URI string,
     * using this URI as the base. 
     *
     * NOTE: some implementations may have no concept of a relative URI.
     */
    AUTF8String resolve(in AUTF8String relativePath);


    /************************************************************************
     * Additional attributes:
     */

    /**
     * The URI spec with an ASCII compatible encoding.  Host portion follows
     * the IDNA draft spec.  Other parts are URL-escaped per the rules of
     * RFC2396.  The result is strictly ASCII.
     */
    readonly attribute ACString asciiSpec;

    /**
     * The URI host with an ASCII compatible encoding.  Follows the IDNA
     * draft spec for converting internationalized domain names (UTF-8) to
     * ASCII for compatibility with existing internet infrasture.
     */
    readonly attribute ACString asciiHost;

    /**
     * The charset of the document from which this URI originated.  An empty
     * value implies UTF-8.
     *
     * If this value is something other than UTF-8 then the URI components
     * (e.g., spec, prePath, username, etc.) will all be fully URL-escaped.
     * Otherwise, the URI components may contain unescaped multibyte UTF-8
     * characters.
     */
    readonly attribute ACString originCharset;
};
