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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

/**
 * Interface for a list of XML attributes.
 *
 * This interface allows access to a list of attributes in
 * three different ways:
 *
 * 1.) by attribute index;
 * 2.) by Namespace-qualified name; or
 * 3.) by XML qualified name.
 *
 * The list will not contain attributes that were declared #IMPLIED
 * but not specified in the start tag.  It will also not contain
 * attributes used as Namespace declarations (xmlns*) unless the
 * http://xml.org/sax/features/namespace-prefixes feature
 * is set to true (it is false by default).
 *
 * The order of attributes in the list is unspecified.
 */
[scriptable, uuid(e347005e-6cd0-11da-be43-001422106990)]
interface nsISAXAttributes : nsISupports
{
  /**
   * Look up the index of an attribute by Namespace name.
   * @param uri The Namespace URI, or the empty string
   *            if the name has no Namespace URI.
   * @param localName The attribute's local name.
   * @return The index of the attribute, or -1
   *         if it does not appear in the list.
   */
  long getIndexFromName(in AString uri, in AString localName);

  /**
   * Look up the index of an attribute by XML qualified name.
   * @param qName The qualified name.
   * @return The index of the attribute, or -1
   *         if it does not appear in the list.
   */
  long getIndexFromQName(in AString qName);

  /**
   * Return the number of attributes in the list. Once you know the
   * number of attributes, you can iterate through the list.
   *
   * @return The number of attributes in the list.
   */
  readonly attribute long length;

  /**
   * Look up an attribute's local name by index.
   * @param index The attribute index (zero-based).
   * @return The local name, or null if the index is out of range.
   */
  AString getLocalName(in unsigned long index);

  /**
   * Look up an attribute's XML qualified name by index.
   * @param index The attribute index (zero-based).
   * @return The XML qualified name, or the empty string if none is
   *         available, or null if the index is out of range.
   */
  AString getQName(in unsigned long index);

  /**
   * Look up an attribute's type by index. The attribute type is one
   * of the strings "CDATA", "ID", "IDREF", "IDREFS", "NMTOKEN",
   * "NMTOKENS", "ENTITY", "ENTITIES", or "NOTATION" (always in upper
   * case). If the parser has not read a declaration for the
   * attribute, or if the parser does not report attribute types, then
   * it must return the value "CDATA" as stated in the XML 1.0
   * Recommendation (clause 3.3.3, "Attribute-Value
   * Normalization"). For an enumerated attribute that is not a
   * notation, the parser will report the type as "NMTOKEN".
   *
   * @param index The attribute index (zero-based).
   * @return The attribute's type as a string, or null if the index is
   *         out of range.
   */
  AString getType(in unsigned long index);

  /**
   * Look up an attribute's type by Namespace name.
   * @param uri The Namespace URI, or the empty string
   *             if the name has no Namespace URI.
   * @param localName The attribute's local name.
   * @return The attribute type as a string, or null if the attribute
   *         is not in the list.
   */
  AString getTypeFromName(in AString uri, in AString localName);

  /**
   * Look up an attribute's type by XML qualified name.
   * @param qName The qualified name.
   * @return The attribute type as a string, or null if the attribute
   *         is not in the list.
   */
  AString getTypeFromQName(in AString qName);

  /**
   * Look up an attribute's Namespace URI by index.
   * @param index The attribute index (zero-based).
   * @return The Namespace URI, or the empty string if none is available,
   *         or null if the index is out of range.
   */
  AString getURI(in unsigned long index);

  /**
   * Look up an attribute's value by index.  If the attribute value is
   * a list of tokens (IDREFS, ENTITIES, or NMTOKENS), the tokens will
   * be concatenated into a single string with each token separated by
   * a single space.
   *
   * @param index The attribute index (zero-based).
   * @return The attribute's value as a string, or null if the index is
   *         out of range.
   */
  AString getValue(in unsigned long index);

  /**
   * Look up an attribute's value by Namespace name.  If the attribute
   * value is a list of tokens (IDREFS, ENTITIES, or NMTOKENS), the
   * tokens will be concatenated into a single string with each token
   * separated by a single space.
   *
   * @param uri The Namespace URI, or the empty string
   *             if the name has no Namespace URI.
   * @param localName The attribute's local name.
   * @return The attribute's value as a string, or null if the attribute is
   *         not in the list.
   */
  AString getValueFromName(in AString uri, in AString localName);

  /**
   * Look up an attribute's value by XML qualified (prefixed) name.
   * If the attribute value is a list of tokens (IDREFS, ENTITIES, or
   * NMTOKENS), the tokens will be concatenated into a single string
   * with each token separated by a single space.
   *
   * @param qName The qualified (prefixed) name.
   * @return The attribute's value as a string, or null if the attribute is
   *         not in the list.
   */
  AString getValueFromQName(in AString qName);
};