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#ifndef __XMLParserAdapter_hpp__
#define __XMLParserAdapter_hpp__
// =================================================================================================
// Copyright 2005 Adobe Systems Incorporated
// All Rights Reserved.
//
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
// =================================================================================================
#include "XMP_Environment.h" // ! Must be the first #include!
#include "XMP_Const.h"
#include <string>
#include <vector>
// =================================================================================================
// XML_Node details
//
// The XML_Nodes are used only during the XML/RDF parsing process. This presently uses an XML parser
// to create an XML tree, then a recursive descent RDF recognizer to build the corresponding XMP.
// This makes it easier to swap XML parsers and provides a clean separation of XML and RDF issues.
// The overall parsing would be faster and use less memory if the RDF recognition were done on the
// fly using a state machine. But it was much easier to write the recursive descent version. The
// current implementation is pretty fast in absolute terms, so being faster might not be crucial.
//
// Like the XMP tree, the XML tree contains vectors of pointers for down links, and offspring have
// a pointer to their parent. Unlike the XMP tree, this is an exact XML document tree. There are no
// introduced top level namespace nodes or rearrangement of the nodes..
//
// The exact state of namespaces can vary during the XML parsing, depending on the parser in use.
// By the time the RDF recognition is done though, the namespaces must be normalized. All of the
// used namespaces must be registered, this is done automatically if necessary. All of the "live"
// namespace prefixes will be unique. The ns field of an XML_Node is the namespace URI, the name
// field contains a qualified name (prefix:local). This includes default namespace mapping, the
// URI and prefix will be missing only for elements and attributes in no namespace.
class XML_Node;
typedef XML_Node * XML_NodePtr; // Handy for things like: XML_Node * a, b; - b is XML_Node, not XML_Node*!
enum { kRootNode = 0, kElemNode = 1, kAttrNode = 2, kCDataNode = 3, kPINode = 4 };
#define IsWhitespaceChar(ch) ( ((ch) == ' ') || ((ch) == 0x09) || ((ch) == 0x0A) || ((ch) == 0x0D) )
typedef std::vector<XML_NodePtr> XML_NodeVector;
typedef XML_NodeVector::iterator XML_NodePos;
typedef XML_NodeVector::const_iterator XML_cNodePos;
#if 0 // Pattern for iterating over the children or attributes:
for ( size_t xxNum = 0, xxLim = _node_->_offspring_.size(); xxNum < xxLim; ++xxNum ) {
const XML_NodePtr _curr_ = _node_->_offspring_[xxNum];
}
#endif
class XML_Node {
public:
// Intended for lightweight internal use. Clients are expected to use the data directly.
XMP_Uns8 kind;
std::string ns, name, value;
size_t nsPrefixLen;
XML_NodePtr parent;
XML_NodeVector attrs;
XML_NodeVector content;
bool IsWhitespaceNode() const;
bool IsLeafContentNode() const; // An empty element or one with a single character data child node.
bool IsEmptyLeafNode() const;
XMP_StringPtr GetAttrValue ( XMP_StringPtr attrName ) const;
void SetAttrValue ( XMP_StringPtr attrName, XMP_StringPtr attrValue );
XMP_StringPtr GetLeafContentValue() const;
void SetLeafContentValue ( XMP_StringPtr value );
size_t CountNamedElements ( XMP_StringPtr nsURI, XMP_StringPtr localName ) const; // Number of child elements with this name.
XML_NodePtr GetNamedElement ( XMP_StringPtr nsURI, XMP_StringPtr localName, size_t which = 0 );
void Dump ( std::string * buffer );
void Serialize ( std::string * buffer );
void RemoveAttrs();
void RemoveContent();
void ClearNode();
XML_Node ( XML_NodePtr _parent, XMP_StringPtr _name, XMP_Uns8 _kind )
: kind(_kind), name(_name), nsPrefixLen(0), parent(_parent) {};
XML_Node ( XML_NodePtr _parent, const std::string & _name, XMP_Uns8 _kind )
: kind(_kind), name(_name), nsPrefixLen(0), parent(_parent) {};
virtual ~XML_Node() { RemoveAttrs(); RemoveContent(); };
private:
XML_Node() : kind(0), parent(0) {}; // ! Hidden to make sure parent pointer is always set.
};
// =================================================================================================
// Abstract base class for XML parser adapters used by the XMP toolkit.
enum { kXMLPendingInputMax = 16 };
class XMLParserAdapter {
public:
XMLParserAdapter()
: tree(0,"",kRootNode), rootNode(0), rootCount(0), charEncoding(XMP_OptionBits(-1)), pendingCount(0)
{
#if XMP_DebugBuild
parseLog = 0;
#endif
};
virtual ~XMLParserAdapter() {};
virtual void ParseBuffer ( const void * buffer, size_t length, bool last ) = 0;
XML_Node tree;
XML_NodeVector parseStack;
XML_NodePtr rootNode;
size_t rootCount;
XMP_OptionBits charEncoding;
size_t pendingCount;
unsigned char pendingInput[kXMLPendingInputMax]; // Buffered input for character encoding checks.
#if XMP_DebugBuild
FILE * parseLog;
#endif
};
// =================================================================================================
#endif // __XMLParserAdapter_hpp__
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