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Switched to POCO library for unified platform/library interface. Deprecated the external module API. It was creating more problems than solving. Removed most built-in libraries in favor of system libraries for easier maintenance. Cleaned and secured code with help from static analyzers.
126 lines
5.0 KiB
C++
126 lines
5.0 KiB
C++
//
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// LexicalHandler.h
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//
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// Library: XML
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// Package: SAX
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// Module: SAX
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//
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// SAX2-ext LexicalHandler Interface.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef SAX_LexicalHandler_INCLUDED
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#define SAX_LexicalHandler_INCLUDED
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#include "Poco/XML/XML.h"
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#include "Poco/XML/XMLString.h"
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namespace Poco {
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namespace XML {
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class XML_API LexicalHandler
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/// This is an optional extension handler for SAX2 to provide lexical information
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/// about an XML document, such as comments and CDATA section boundaries.
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/// XML readers are not required to recognize this handler, and it is not part of
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/// core-only SAX2 distributions.
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///
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/// The events in the lexical handler apply to the entire document, not just to the
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/// document element, and all lexical handler events must appear between the content
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/// handler's startDocument and endDocument events.
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///
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/// To set the LexicalHandler for an XML reader, use the setProperty method with the
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/// property name http://xml.org/sax/properties/lexical-handler and an object implementing
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/// this interface (or null) as the value. If the reader does not report lexical events,
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/// it will throw a SAXNotRecognizedException when you attempt to register the handler.
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{
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public:
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virtual void startDTD(const XMLString& name, const XMLString& publicId, const XMLString& systemId) = 0;
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/// Report the start of DTD declarations, if any.
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///
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/// This method is intended to report the beginning of the DOCTYPE declaration;
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/// if the document has no DOCTYPE declaration, this method will not be invoked.
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///
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/// All declarations reported through DTDHandler or DeclHandler events must appear
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/// between the startDTD and endDTD events. Declarations are assumed to belong to
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/// the internal DTD subset unless they appear between startEntity and endEntity
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/// events. Comments and processing instructions from the DTD should also be reported
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/// between the startDTD and endDTD events, in their original order of (logical) occurrence;
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/// they are not required to appear in their correct locations relative to DTDHandler or
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/// DeclHandler events, however.
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///
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/// Note that the start/endDTD events will appear within the start/endDocument events from
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/// ContentHandler and before the first startElement event.
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virtual void endDTD() = 0;
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/// Report the end of DTD declarations.
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///
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/// This method is intended to report the end of the DOCTYPE declaration; if the document
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/// has no DOCTYPE declaration, this method will not be invoked.
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virtual void startEntity(const XMLString& name) = 0;
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/// Report the beginning of some internal and external XML entities.
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///
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/// The reporting of parameter entities (including the external DTD subset) is optional,
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/// and SAX2 drivers that report LexicalHandler events may not implement it; you can use the
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/// http://xml.org/sax/features/lexical-handler/parameter-entities feature to query or control
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/// the reporting of parameter entities.
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///
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/// General entities are reported with their regular names, parameter entities have '%'
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/// prepended to their names, and the external DTD subset has the pseudo-entity name "[dtd]".
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///
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/// When a SAX2 driver is providing these events, all other events must be properly nested
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/// within start/end entity events. There is no additional requirement that events from
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/// DeclHandler or DTDHandler be properly ordered.
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///
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/// Note that skipped entities will be reported through the skippedEntity event, which is part of
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/// the ContentHandler interface.
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///
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/// Because of the streaming event model that SAX uses, some entity boundaries cannot be reported under
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/// any circumstances:
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///
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/// * general entities within attribute values
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/// * parameter entities within declarations
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///
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/// These will be silently expanded, with no indication of where the original entity boundaries were.
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///
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/// Note also that the boundaries of character references (which are not really entities anyway) are not reported.
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///
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/// All start/endEntity events must be properly nested.
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virtual void endEntity(const XMLString& name) = 0;
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/// Report the end of an entity.
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virtual void startCDATA() = 0;
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/// Report the start of a CDATA section.
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///
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/// The contents of the CDATA section will be reported through the regular characters event;
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/// this event is intended only to report the boundary.
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virtual void endCDATA() = 0;
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/// Report the end of a CDATA section.
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virtual void comment(const XMLChar ch[], int start, int length) = 0;
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/// Report an XML comment anywhere in the document.
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///
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/// This callback will be used for comments inside or outside the document element,
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/// including comments in the external DTD subset (if read). Comments in the DTD must
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/// be properly nested inside start/endDTD and start/endEntity events (if used).
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protected:
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virtual ~LexicalHandler();
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};
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} } // namespace Poco::XML
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#endif // SAX_LexicalHandler_INCLUDED
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