tinyxmlparser.cpp

使用stl技术,(还没看,是听说的)

				text.StreamIn( in, tag );

				// What follows text is a closing tag or another node.
				// Go around again and figure it out.
				continue;
			}

			// We now have either a closing tag...or another node.
			// We should be at a "<", regardless.
			if ( !in->good() ) return;
			assert( in->peek() == '<' );
			int tagIndex = tag->length();

			bool closingTag = false;
			bool firstCharFound = false;

			for( ;; )
			{
				if ( !in->good() )
					return;

				int c = in->peek();
				
				if ( c == '>' )
					break;

				*tag += c;
				in->get();

				if ( !firstCharFound && c != '<' && !IsWhiteSpace( c ) )
				{
					firstCharFound = true;
					if ( c == '/' )
						closingTag = true;
				}
			}
			// If it was a closing tag, then read in the closing '>' to clean up the input stream.
			// If it was not, the streaming will be done by the tag.
			if ( closingTag )
			{
				int c = in->get();
				assert( c == '>' );
				*tag += c;

				// We are done, once we've found our closing tag.
				return;
			}
			else
			{
				// If not a closing tag, id it, and stream.
				const char* tagloc = tag->c_str() + tagIndex;
				TiXmlNode* node = Identify( tagloc );
				if ( !node )
					return;
				node->StreamIn( in, tag );
				delete node;
				node = 0;

				// No return: go around from the beginning: text, closing tag, or node.
			}
		}
	}
}
#endif

const char* TiXmlElement::Parse( const char* p )
{
	p = SkipWhiteSpace( p );
	TiXmlDocument* document = GetDocument();

	if ( !p || !*p || *p != '<' )
	{
		if ( document ) document->SetError( TIXML_ERROR_PARSING_ELEMENT );
		return false;
	}

	p = SkipWhiteSpace( p+1 );

	// Read the name.
    p = ReadName( p, &value );
	if ( !p || !*p )
	{
		if ( document )	document->SetError( TIXML_ERROR_FAILED_TO_READ_ELEMENT_NAME );
		return false;
	}

    TIXML_STRING endTag ("</");
	endTag += value;
	endTag += ">";

	// Check for and read attributes. Also look for an empty
	// tag or an end tag.
	while ( p && *p )
	{
		p = SkipWhiteSpace( p );
		if ( !p || !*p )
		{
			if ( document ) document->SetError( TIXML_ERROR_READING_ATTRIBUTES );
			return 0;
		}
		if ( *p == '/' )
		{
			++p;
			// Empty tag.
			if ( *p  != '>' )
			{
				if ( document ) document->SetError( TIXML_ERROR_PARSING_EMPTY );		
				return 0;
			}
			return (p+1);
		}
		else if ( *p == '>' )
		{
			// Done with attributes (if there were any.)
			// Read the value -- which can include other
			// elements -- read the end tag, and return.
			++p;
			p = ReadValue( p );		// Note this is an Element method, and will set the error if one happens.
			if ( !p || !*p )
				return 0;

			// We should find the end tag now
			if ( StringEqual( p, endTag.c_str(), false ) )
			{
				p += endTag.length();
				return p;
			}
			else
			{
				if ( document ) document->SetError( TIXML_ERROR_READING_END_TAG );
				return 0;
			}
		}
		else
		{
			// Try to read an element:
			TiXmlAttribute attrib;
			attrib.SetDocument( document );
			p = attrib.Parse( p );

			if ( !p || !*p )
			{
				if ( document ) document->SetError( TIXML_ERROR_PARSING_ELEMENT );
				return 0;
			}
			SetAttribute( attrib.Name(), attrib.Value() );
		}
	}
	return p;
}


const char* TiXmlElement::ReadValue( const char* p )
{
	TiXmlDocument* document = GetDocument();

	// Read in text and elements in any order.
	p = SkipWhiteSpace( p );
	while ( p && *p )
	{
		if ( *p != '<' )
		{
			// Take what we have, make a text element.
			TiXmlText* textNode = new TiXmlText( "" );

			if ( !textNode )
			{
				if ( document ) document->SetError( TIXML_ERROR_OUT_OF_MEMORY );
				    return 0;
			}

			p = textNode->Parse( p );

			if ( !textNode->Blank() )
				LinkEndChild( textNode );
			else
				delete textNode;
		} 
		else 
		{
			// We hit a '<'
			// Have we hit a new element or an end tag?
			if ( StringEqual( p, "</", false ) )
			{
				return p;
			}
			else
			{
				TiXmlNode* node = Identify( p );
				if ( node )
				{
					p = node->Parse( p );
					LinkEndChild( node );
				}				
				else
				{
					return 0;
				}
			}
		}
		p = SkipWhiteSpace( p );
	}

	if ( !p )
	{
		if ( document ) document->SetError( TIXML_ERROR_READING_ELEMENT_VALUE );
	}	
	return p;
}


#ifdef TIXML_USE_STL
void TiXmlUnknown::StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag )
{
	while ( in->good() )
	{
		int c = in->get();	
		(*tag) += c;

		if ( c == '>' )
		{
			// All is well.
			return;		
		}
	}
}
#endif


const char* TiXmlUnknown::Parse( const char* p )
{
	TiXmlDocument* document = GetDocument();
	p = SkipWhiteSpace( p );
	if ( !p || !*p || *p != '<' )
	{
		if ( document ) document->SetError( TIXML_ERROR_PARSING_UNKNOWN );
		return 0;
	}
	++p;
    value = "";

	while ( p && *p && *p != '>' )
	{
		value += *p;
		++p;
	}

	if ( !p )
	{
		if ( document )	document->SetError( TIXML_ERROR_PARSING_UNKNOWN );
	}
	if ( *p == '>' )
		return p+1;
	return p;
}

#ifdef TIXML_USE_STL
void TiXmlComment::StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag )
{
	while ( in->good() )
	{
		int c = in->get();	
		(*tag) += c;

		if ( c == '>' 
			 && tag->at( tag->length() - 2 ) == '-'
			 && tag->at( tag->length() - 3 ) == '-' )
		{
			// All is well.
			return;		
		}
	}
}
#endif


const char* TiXmlComment::Parse( const char* p )
{
	TiXmlDocument* document = GetDocument();
	value = "";

	p = SkipWhiteSpace( p );
	const char* startTag = "<!--";
	const char* endTag   = "-->";

	if ( !StringEqual( p, startTag, false ) )
	{
		document->SetError( TIXML_ERROR_PARSING_COMMENT );
		return 0;
	}
	p += strlen( startTag );
	p = ReadText( p, &value, false, endTag, false );
	return p;
}


const char* TiXmlAttribute::Parse( const char* p )
{
	p = SkipWhiteSpace( p );
	if ( !p || !*p ) return 0;

	// Read the name, the '=' and the value.
	p = ReadName( p, &name );
	if ( !p || !*p )
	{
		if ( document ) document->SetError( TIXML_ERROR_READING_ATTRIBUTES );
		return 0;
	}
	p = SkipWhiteSpace( p );
	if ( !p || !*p || *p != '=' )
	{
		if ( document ) document->SetError( TIXML_ERROR_READING_ATTRIBUTES );
		return 0;
	}

	++p;	// skip '='
	p = SkipWhiteSpace( p );
	if ( !p || !*p )
	{
		if ( document ) document->SetError( TIXML_ERROR_READING_ATTRIBUTES );
		return 0;
	}
	
	const char* end;

	if ( *p == '\'' )
	{
		++p;
		end = "\'";
		p = ReadText( p, &value, false, end, false );
	}
	else if ( *p == '"' )
	{
		++p;
		end = "\"";
		p = ReadText( p, &value, false, end, false );
	}
	else
	{
		// All attribute values should be in single or double quotes.
		// But this is such a common error that the parser will try
		// its best, even without them.
		value = "";
		while (    p && *p										// existence
				&& !isspace( *p ) && *p != '\n' && *p != '\r'	// whitespace
				&& *p != '/' && *p != '>' )						// tag end
		{
			value += *p;
			++p;
		}
	}
	return p;
}

#ifdef TIXML_USE_STL
void TiXmlText::StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag )
{
	while ( in->good() )
	{
		int c = in->peek();	
		if ( c == '<' )
			return;

		(*tag) += c;
		in->get();
	}
}
#endif

const char* TiXmlText::Parse( const char* p )
{
	value = "";

	//TiXmlDocument* doc = GetDocument();
	bool ignoreWhite = true;
//	if ( doc && !doc->IgnoreWhiteSpace() ) ignoreWhite = false;

	const char* end = "<";
	p = ReadText( p, &value, ignoreWhite, end, false );
	if ( p )
		return p-1;	// don't truncate the '<'
	return 0;
}

#ifdef TIXML_USE_STL
void TiXmlDeclaration::StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag )
{
	while ( in->good() )
	{
		int c = in->get();
		(*tag) += c;

		if ( c == '>' )
		{
			// All is well.
			return;
		}
	}
}
#endif

const char* TiXmlDeclaration::Parse( const char* p )
{
	p = SkipWhiteSpace( p );
	// Find the beginning, find the end, and look for
	// the stuff in-between.
	TiXmlDocument* document = GetDocument();
	if ( !p || !*p || !StringEqual( p, "<?xml", true ) )
	{
		if ( document ) document->SetError( TIXML_ERROR_PARSING_DECLARATION );
		return 0;
	}

	p += 5;
//	const char* start = p+5;
//	const char* end  = strstr( start, "?>" );

	version = "";
	encoding = "";
	standalone = "";

	while ( p && *p )
	{
		if ( *p == '>' )
		{
			++p;
			return p;
		}

		p = SkipWhiteSpace( p );
		if ( StringEqual( p, "version", true ) )
		{
//			p += 7;
			TiXmlAttribute attrib;
			p = attrib.Parse( p );		
			version = attrib.Value();
		}
		else if ( StringEqual( p, "encoding", true ) )
		{
//			p += 8;
			TiXmlAttribute attrib;
			p = attrib.Parse( p );		
			encoding = attrib.Value();
		}
		else if ( StringEqual( p, "standalone", true ) )
		{
//			p += 10;
			TiXmlAttribute attrib;
			p = attrib.Parse( p );		
			standalone = attrib.Value();
		}
		else
		{
			// Read over whatever it is.
			while( p && *p && *p != '>' && !isspace( *p ) )
				++p;
		}
	}
	return 0;
}

bool TiXmlText::Blank() const
{
	for ( unsigned i=0; i<value.length(); i++ )
		if ( !isspace( value[i] ) )
			return false;
	return true;
}