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LexicalHandler.h

//
// LexicalHandler.h
//
// $Id: //poco/1.2/XML/include/Poco/SAX/LexicalHandler.h#1 $
//
// Library: XML
// Package: SAX
// Module:  SAX
//
// SAX2-ext LexicalHandler Interface.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef SAX_LexicalHandler_INCLUDED
#define SAX_LexicalHandler_INCLUDED


#include "Poco/XML/XML.h"
#include "Poco/XML/XMLString.h"


namespace Poco {
namespace XML {


00051 class XML_API LexicalHandler
      /// This is an optional extension handler for SAX2 to provide lexical information 
      /// about an XML document, such as comments and CDATA section boundaries. 
      /// XML readers are not required to recognize this handler, and it is not part of 
      /// core-only SAX2 distributions.
      /// 
      /// The events in the lexical handler apply to the entire document, not just to the 
      /// document element, and all lexical handler events must appear between the content 
      /// handler's startDocument and endDocument events.
      /// 
      /// To set the LexicalHandler for an XML reader, use the setProperty method with the 
      /// property name http://xml.org/sax/properties/lexical-handler and an object implementing 
      /// this interface (or null) as the value. If the reader does not report lexical events, 
      /// it will throw a SAXNotRecognizedException when you attempt to register the handler.
{
public:
      virtual void startDTD(const XMLString& name, const XMLString& publicId, const XMLString& systemId) = 0;
            /// Report the start of DTD declarations, if any.
            /// 
            /// This method is intended to report the beginning of the DOCTYPE declaration; 
            /// if the document has no DOCTYPE declaration, this method will not be invoked.
            /// 
            /// All declarations reported through DTDHandler or DeclHandler events must appear 
            /// between the startDTD and endDTD events. Declarations are assumed to belong to 
            /// the internal DTD subset unless they appear between startEntity and endEntity 
            /// events. Comments and processing instructions from the DTD should also be reported 
            /// between the startDTD and endDTD events, in their original order of (logical) occurrence; 
            /// they are not required to appear in their correct locations relative to DTDHandler or 
            /// DeclHandler events, however.
            /// 
            /// Note that the start/endDTD events will appear within the start/endDocument events from 
            /// ContentHandler and before the first startElement event.

      virtual void endDTD() = 0;
            /// Report the end of DTD declarations.
            /// 
            /// This method is intended to report the end of the DOCTYPE declaration; if the document 
            /// has no DOCTYPE declaration, this method will not be invoked.

      virtual void startEntity(const XMLString& name) = 0;
            /// Report the beginning of some internal and external XML entities.
            /// 
            /// The reporting of parameter entities (including the external DTD subset) is optional, 
            /// and SAX2 drivers that report LexicalHandler events may not implement it; you can use the 
            /// http://xml.org/sax/features/lexical-handler/parameter-entities feature to query or control 
            /// the reporting of parameter entities.
            /// 
            /// General entities are reported with their regular names, parameter entities have '%' 
            /// prepended to their names, and the external DTD subset has the pseudo-entity name "[dtd]".
            /// 
            /// When a SAX2 driver is providing these events, all other events must be properly nested 
            /// within start/end entity events. There is no additional requirement that events from 
            /// DeclHandler or DTDHandler be properly ordered.
            /// 
            /// Note that skipped entities will be reported through the skippedEntity event, which is part of 
            /// the ContentHandler interface.
            /// 
            /// Because of the streaming event model that SAX uses, some entity boundaries cannot be reported under 
            /// any circumstances:
            /// 
            ///     * general entities within attribute values
            ///     * parameter entities within declarations
            ///
            /// These will be silently expanded, with no indication of where the original entity boundaries were.
            /// 
            /// Note also that the boundaries of character references (which are not really entities anyway) are not reported.
            /// 
            /// All start/endEntity events must be properly nested. 

      virtual void endEntity(const XMLString& name) = 0;
            /// Report the end of an entity.
            
      virtual void startCDATA() = 0;
            /// Report the start of a CDATA section.
            ///
            /// The contents of the CDATA section will be reported through the regular characters event; 
            /// this event is intended only to report the boundary.

      virtual void endCDATA() = 0;
            /// Report the end of a CDATA section.
            
      virtual void comment(const XMLChar ch[], int start, int length) = 0;
            /// Report an XML comment anywhere in the document.
            /// 
            /// This callback will be used for comments inside or outside the document element, 
            /// including comments in the external DTD subset (if read). Comments in the DTD must 
            /// be properly nested inside start/endDTD and start/endEntity events (if used).

protected:
      virtual ~LexicalHandler();
};


} } // namespace Poco::XML


#endif // SAX_LexicalHandler_INCLUDED

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