tinyxml.h

一个j2me中很做要的包

/*
Copyright (c) 2000 Lee Thomason (www.grinninglizard.com)

This software is provided 'as-is', without any express or implied 
warranty. In no event will the authors be held liable for any 
damages arising from the use of this software.

Permission is granted to anyone to use this software for any 
purpose, including commercial applications, and to alter it and 
redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must 
not claim that you wrote the original software. If you use this 
software in a product, an acknowledgment in the product documentation 
would be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and 
must not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source 
distribution.
*/


#ifndef TINYXML_INCLUDED
#define TINYXML_INCLUDED

#pragma warning( disable : 4530 )
#pragma warning( disable : 4786 )

#include <string>
#include <stdio.h>
#include <assert.h>

class TiXmlDocument;
class TiXmlElement;
class TiXmlComment;
class TiXmlUnknown;
class TiXmlAttribute;
class TiXmlText;
class TiXmlDeclaration;


/** TiXmlBase is a base class for every class in TinyXml.
	It does little except to establist that TinyXml classes
	can be printed and provide some utility functions.

	In XML, the document and elements can contain
	other elements and other types of nodes.

	@verbatim
	A Document can contain:	Element	(container or leaf)
							Comment (leaf)
							Unknown (leaf)
							Declaration( leaf )

	An Element can contain:	Element (container or leaf)
							Text	(leaf)
							Attributes (not on tree)
							Comment (leaf)
							Unknown (leaf)

	A Decleration contains: Attributes (not on tree)
	@endverbatim
*/
class TiXmlBase
{
	friend class TiXmlNode;
	friend class TiXmlElement;
	friend class TiXmlDocument;
 
  public:
	TiXmlBase()								{}	
	virtual ~TiXmlBase()					{}
	
	/*	All TinyXml classes can print themselves to a filestream.
	*/
	virtual void Print( FILE* fp, int depth )	= 0;

  protected:
	/*	General parsing helper method. Takes a pointer in,
		skips all the white space it finds, and returns a pointer
		to the first non-whitespace data.
	*/
	static const char* SkipWhiteSpace( const char* p );

	/*	Reads an XML name into the string provided. Returns
		a pointer just past the last character of the name, 
		or 0 if the function has an error.
	*/
	static const char* ReadName( const char* p, std::string* name );

	enum
	{
		TIXML_NO_ERROR = 0,
		TIXML_ERROR_OPENING_FILE,
		TIXML_ERROR_OUT_OF_MEMORY,
		TIXML_ERROR_PARSING_ELEMENT,
		TIXML_ERROR_FAILED_TO_READ_ELEMENT_NAME,
		TIXML_ERROR_READING_ELEMENT_VALUE,
		TIXML_ERROR_READING_ATTRIBUTES,
		TIXML_ERROR_PARSING_EMPTY,
		TIXML_ERROR_READING_END_TAG,
		TIXML_ERROR_PARSING_UNKNOWN,
		TIXML_ERROR_PARSING_COMMENT,
		TIXML_ERROR_PARSING_DECLARATION,

		TIXML_ERROR_STRING_COUNT
	};
	static const char* errorString[ TIXML_ERROR_STRING_COUNT ];
};


/** The parent class for everything in the Document Object Model.
	(Except for attributes, which are contained in elements.)
	Nodes have siblings, a parent, and children. A node can be
	in a document, or stand on its own. The type of a TyXmlNode
	can be queried, and it can be cast to its more defined type.
*/
class TiXmlNode : public TiXmlBase
{
  public:
	/** The types of XML nodes supported by TinyXml. (All the
		unsupported types are picked up by UNKNOWN.)
	*/
	enum NodeType 
	{
		DOCUMENT, ELEMENT, COMMENT, UNKNOWN, TEXT, DECLARATION, TYPECOUNT
	};

	virtual ~TiXmlNode();

	/** The meaning of 'value' changes for the specific type of
		TiXmlNode.
		@verbatim
		Document:	filename of the xml file
		Element:	name of the element
		Comment:	the comment text
		Unknown:	the tag contents
		Text:		the text string
		@endverbatim

		The subclasses will wrap this function.
	*/
	const std::string& Value()	const			{ return value; }

	/** Changes the value of the node. Defined as:
		@verbatim
		Document:	filename of the xml file
		Element:	name of the element
		Comment:	the comment text
		Unknown:	the tag contents
		Text:		the text string
		@endverbatim
	*/
	void SetValue( const std::string& _value )		{ value = _value; }

	/// Delete all the children of this node. Does not affect 'this'.
	void Clear();

	/// One step up the DOM.
	TiXmlNode* Parent() const					{ return parent; }

	TiXmlNode* FirstChild()	const	{ return firstChild; }		///< The first child of this node. Will be null if there are no children.
	TiXmlNode* FirstChild( const std::string& value ) const;	///< The first child of this node with the matching 'value'. Will be null if none found.
	
	TiXmlNode* LastChild() const	{ return lastChild; }		/// The last child of this node. Will be null if there are no children.
	TiXmlNode* LastChild( const std::string& value ) const;		/// The last child of this node matching 'value'. Will be null if there are no children.

	/** An alternate way to walk the children of a node.
		One way to iterate over nodes is:
		@verbatim
			for( child = parent->FirstChild(); child; child = child->NextSibling() )
		@endverbatim

		IterateChildren does the same thing with the syntax:
		@verbatim
			child = 0;
			while( child = parent->IterateChildren( child ) )
		@endverbatim

		IterateChildren takes the previous child as input and finds
		the next one. If the previous child is null, it returns the
		first. IterateChildren will return null when done.
	*/
	TiXmlNode* IterateChildren( TiXmlNode* previous );

	/// This flavor of IterateChildren searches for children with a particular 'value'
	TiXmlNode* IterateChildren( const std::string& value, TiXmlNode* previous );
		
	/** Add a new node related to this. Adds a child past the LastChild.
		Returns a pointer to the new object or NULL if an error occured.
	*/
	TiXmlNode* InsertEndChild( const TiXmlNode& addThis );					

	/** Add a new node related to this. Adds a child before the specified child.
		Returns a pointer to the new object or NULL if an error occured.
	*/
	TiXmlNode* InsertBeforeChild( TiXmlNode* beforeThis, const TiXmlNode& addThis );

	/** Add a new node related to this. Adds a child after the specified child.
		Returns a pointer to the new object or NULL if an error occured.
	*/
	TiXmlNode* InsertAfterChild(  TiXmlNode* afterThis, const TiXmlNode& addThis );
	
	/** Replace a child of this node.
		Returns a pointer to the new object or NULL if an error occured.
	*/
	TiXmlNode* ReplaceChild( TiXmlNode* replaceThis, const TiXmlNode& withThis );
	
	/// Delete a child of this node.
	bool RemoveChild( TiXmlNode* removeThis );

	/// Navigate to a sibling node.
	TiXmlNode* PreviousSibling() const			{ return prev; }

	/// Navigate to a sibling node.
	TiXmlNode* PreviousSibling( const std::string& ) const;
	
	/// Navigate to a sibling node.
	TiXmlNode* NextSibling() const				{ return next; }

	/// Navigate to a sibling node with the given 'value'.
	TiXmlNode* NextSibling( const std::string& ) const;

	/** Convenience function to get through elements. 
		Calls NextSibling and ToElement. Will skip all non-Element
		nodes. Returns 0 if there is not another element.
	*/
	TiXmlElement* NextSiblingElement() const;

	/** Convenience function to get through elements. 
		Calls NextSibling and ToElement. Will skip all non-Element
		nodes. Returns 0 if there is not another element.
	*/
	TiXmlElement* NextSiblingElement( const std::string& ) const;

	/// Convenience function to get through elements.
	TiXmlElement* FirstChildElement()	const;
	
	/// Convenience function to get through elements.
	TiXmlElement* FirstChildElement( const std::string& value ) const;

	/// Query the type (as an enumerated value, above) of this node.
	virtual int Type()	{ return type; }

	/** Return a pointer to the Document this node lives in. 
		Returns null if not in a document.
	*/
	TiXmlDocument* GetDocument() const;

	TiXmlDocument* ToDocument()	const	{ return ( type == DOCUMENT ) ? (TiXmlDocument*) this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
	TiXmlElement*  ToElement() const	{ return ( type == ELEMENT  ) ? (TiXmlElement*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
	TiXmlComment*  ToComment() const	{ return ( type == COMMENT  ) ? (TiXmlComment*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
	TiXmlUnknown*  ToUnknown() const	{ return ( type == UNKNOWN  ) ? (TiXmlUnknown*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
	TiXmlText*	   ToText()    const	{ return ( type == TEXT     ) ? (TiXmlText*)     this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
	TiXmlDeclaration* ToDeclaration() const	{ return ( type == DECLARATION ) ? (TiXmlDeclaration*) this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.

	virtual TiXmlNode* Clone() const = 0;

  protected:
	TiXmlNode( NodeType type );
	virtual const char* Parse( const char* ) = 0;

	// The node is passed in by ownership. This object will delete it.
	TiXmlNode* LinkEndChild( TiXmlNode* addThis );

	// Figure out what is at *p, and parse it. Return a node if
	// successful, and update p.
	TiXmlNode* IdentifyAndParse( const char** p );

	void CopyToClone( TiXmlNode* target ) const	{ target->value = value; }

	TiXmlNode*		parent;		
	NodeType		type;
	
	TiXmlNode*		firstChild;
	TiXmlNode*		lastChild;

	std::string		value;
	
	TiXmlNode*		prev;
	TiXmlNode*		next;
};


/** An attribute is a name-value pair. Elements have an arbitrary
	number of attributes, each with a unique name.

	@note The attributes are not TiXmlNodes, since they are not
		  part of the tinyXML document object model. There are other
		  suggested ways to look at this problem.

	@note Attributes have a parent
*/
class TiXmlAttribute : public TiXmlBase
{
	friend class TiXmlAttributeSet;

  public:
	/// Construct an empty attribute.
	TiXmlAttribute() : prev( 0 ), next( 0 )	{}

	/// Construct an attribute with a name and value.
	TiXmlAttribute( const std::string& _name, const std::string& _value )	: name( _name ), value( _value ), prev( 0 ), next( 0 ) {}

	const std::string& Name()  const { return name; }		///< Return the name of this attribute.
	const std::string& Value() const { return value; }		///< Return the value of this attribute.