gecko/parser/xml/public/nsISAXContentHandler.idl
2012-05-21 12:12:37 +01:00

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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 nsISAXAttributes;
/**
* Receive notification of the logical content of a document.
*
* This is the main interface that most SAX applications implement: if
* the application needs to be informed of basic parsing events, it
* implements this interface and registers an instance with the SAX
* parser. The parser uses the instance to report basic
* document-related events like the start and end of elements and
* character data.
*
* The order of events in this interface is very important, and
* mirrors the order of information in the document itself. For
* example, all of an element's content (character data, processing
* instructions, and/or subelements) will appear, in order, between
* the startElement event and the corresponding endElement event.
*/
[scriptable, uuid(2a99c757-dfee-4806-bff3-f721440412e0)]
interface nsISAXContentHandler : nsISupports
{
/**
* Receive notification of the beginning of a document.
*
* The SAX parser will invoke this method only once, before any
* other event callbacks.
*/
void startDocument();
/**
* Receive notification of the end of a document.
*
* There is an apparent contradiction between the documentation for
* this method and the documentation for ErrorHandler.fatalError().
* Until this ambiguity is resolved in a future major release,
* clients should make no assumptions about whether endDocument()
* will or will not be invoked when the parser has reported a
* fatalError() or thrown an exception.
*
* The SAX parser will invoke this method only once, and it will be
* the last method invoked during the parse. The parser shall not
* invoke this method until it has either abandoned parsing (because
* of an unrecoverable error) or reached the end of input.
*/
void endDocument();
/**
* Receive notification of the beginning of an element.
*
* The Parser will invoke this method at the beginning of every
* element in the XML document; there will be a corresponding
* endElement event for every startElement event (even when the
* element is empty). All of the element's content will be reported,
* in order, before the corresponding endElement event.
*
* This event allows up to three name components for each element:
*
* 1.) the Namespace URI;
* 2.) the local name; and
* 3.) the qualified (prefixed) name.
*
* Any or all of these may be provided, depending on the values of
* the http://xml.org/sax/features/namespaces and the
* http://xml.org/sax/features/namespace-prefixes properties:
*
* The Namespace URI and local name are required when the namespaces
* property is true (the default), and are optional when the
* namespaces property is false (if one is specified, both must be);
*
* The qualified name is required when the namespace-prefixes
* property is true, and is optional when the namespace-prefixes
* property is false (the default).
*
* Note that the attribute list provided will contain only
* attributes with explicit values (specified or defaulted):
* #IMPLIED attributes will be omitted. The attribute list will
* contain attributes used for Namespace declarations (xmlns*
* attributes) only if the
* http://xml.org/sax/features/namespace-prefixes property is true
* (it is false by default, and support for a true value is
* optional).
*
* @param uri the Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed
* @param localName the local name (without prefix), or the
* empty string if Namespace processing is not being
* performed
* @param qName the qualified name (with prefix), or the
* empty string if qualified names are not available
* @param atts the attributes attached to the element. If
* there are no attributes, it shall be an empty
* SAXAttributes object. The value of this object after
* startElement returns is undefined
*/
void startElement(in AString uri, in AString localName,
in AString qName, in nsISAXAttributes attributes);
/**
* Receive notification of the end of an element.
*
* The SAX parser will invoke this method at the end of every
* element in the XML document; there will be a corresponding
* startElement event for every endElement event (even when the
* element is empty).
*
* For information on the names, see startElement.
*
* @param uri the Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed
* @param localName the local name (without prefix), or the
* empty string if Namespace processing is not being
* performed
* @param qName the qualified XML name (with prefix), or the
* empty string if qualified names are not available
*/
void endElement(in AString uri, in AString localName, in AString qName);
/**
* Receive notification of character data.
*
* The Parser will call this method to report each chunk of
* character data. SAX parsers may return all contiguous character
* data in a single chunk, or they may split it into several chunks;
* however, all of the characters in any single event must come from
* the same external entity so that the Locator provides useful
* information.
*
* Note that some parsers will report whitespace in element
* content using the ignorableWhitespace method rather than this one
* (validating parsers must do so).
*
* @param value the characters from the XML document
*/
void characters(in AString value);
/**
* Receive notification of a processing instruction.
*
* The Parser will invoke this method once for each processing
* instruction found: note that processing instructions may occur
* before or after the main document element.
*
* A SAX parser must never report an XML declaration (XML 1.0,
* section 2.8) or a text declaration (XML 1.0, section 4.3.1) using
* this method.
*
* @param target the processing instruction target
* @param data the processing instruction data, or null if
* none was supplied. The data does not include any
* whitespace separating it from the target
*/
void processingInstruction(in AString target, in AString data);
/**
* Receive notification of ignorable whitespace in element content.
*
* Validating Parsers must use this method to report each chunk of
* whitespace in element content (see the W3C XML 1.0
* recommendation, section 2.10): non-validating parsers may also
* use this method if they are capable of parsing and using content
* models.
*
* SAX parsers may return all contiguous whitespace in a single
* chunk, or they may split it into several chunks; however, all of
* the characters in any single event must come from the same
* external entity, so that the Locator provides useful information.
*
* @param whitespace the characters from the XML document
*/
void ignorableWhitespace(in AString whitespace);
/**
* Begin the scope of a prefix-URI Namespace mapping.
*
* The information from this event is not necessary for normal
* Namespace processing: the SAX XML reader will automatically
* replace prefixes for element and attribute names when the
* http://xml.org/sax/features/namespaces feature is
* true (the default).
*
* There are cases, however, when applications need to use prefixes
* in character data or in attribute values, where they cannot
* safely be expanded automatically; the start/endPrefixMapping
* event supplies the information to the application to expand
* prefixes in those contexts itself, if necessary.
*
* Note that start/endPrefixMapping events are not guaranteed to be
* properly nested relative to each other: all startPrefixMapping
* events will occur immediately before the corresponding
* startElement event, and all endPrefixMapping events will occur
* immediately after the corresponding endElement event, but their
* order is not otherwise guaranteed.
*
* There should never be start/endPrefixMapping events for the
* "xml" prefix, since it is predeclared and immutable.
*
* @param prefix The Namespace prefix being declared. An empty
* string is used for the default element namespace,
* which has no prefix.
* @param uri The Namespace URI the prefix is mapped to.
*/
void startPrefixMapping(in AString prefix, in AString uri);
/**
* End the scope of a prefix-URI mapping.
*
* See startPrefixMapping for details. These events will always
* occur immediately after the corresponding endElement event, but
* the order of endPrefixMapping events is not otherwise guaranteed.
*
* @param prefix The prefix that was being mapped. This is the empty
* string when a default mapping scope ends.
*/
void endPrefixMapping(in AString prefix);
//XXX documentLocator
};