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/*
www.sourceforge.net/projects/tinyxml
Original code	(2.0 and earlier )copyright	(c)	2000-2002	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.
 */

#include "NXU_tinyxml.h"
#include <ctype.h>
#include <stddef.h>

//#define	DEBUG_PARSER
#if	defined( DEBUG_PARSER	)
#if	defined( DEBUG ) &&	defined( _MSC_VER	)
#include <windows.h>
#define	TIXML_LOG	OutputDebugString
#else
#define	TIXML_LOG	printf
#endif
#endif

namespace	NXU
{

// Note	tha	"PutString"	hardcodes	the	same list. This
// is	less flexible	than it	appears. Changing	the	entries
// or	order	will break putstring.
TiXmlBase::Entity	TiXmlBase::entity[NUM_ENTITY]	=
{
	{
		"&", 5,	'&'
	}
	,
	{
		"<",	4, '<'
	}
	,
	{
		">",	4, '>'
	}
	,
	{
		""",	6, '\"'
	}
	,
	{
		"'",	6, '\''
	}
};

// Bunch of	unicode	info at:
//		http://www.unicode.org/faq/utf_bom.html
// Including the basic of	this table,	which	determines the #bytes	in the
// sequence	from the lead	byte.	1	placed for invalid sequences --
// although	the	result will	be junk, pass	it through as	much as	possible.
// Beware	of the non-characters	in UTF-8:
//				ef bb	bf (Microsoft	"lead	bytes")
//				ef bf	be
//				ef bf	bf

const	unsigned char	TIXML_UTF_LEAD_0 = 0xefU;
const	unsigned char	TIXML_UTF_LEAD_1 = 0xbbU;
const	unsigned char	TIXML_UTF_LEAD_2 = 0xbfU;

const	int	TiXmlBase::utf8ByteTable[256]	=
{
	//	0	 1	2	 3	4	 5	6	 7	8	 9	a	 b	c	 d	e	 f
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x00
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x10
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x20
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x30
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x40
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x50
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x60
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x70	End	of ASCII range
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x80 0x80	to 0xc1	invalid
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0x90
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0xa0
	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1,	 //	0xb0
	1, 1,	2, 2,	2, 2,	2, 2,	2, 2,	2, 2,	2, 2,	2, 2,	 //	0xc0 0xc2	to 0xdf	2	byte
	2, 2,	2, 2,	2, 2,	2, 2,	2, 2,	2, 2,	2, 2,	2, 2,	 //	0xd0
	3, 3,	3, 3,	3, 3,	3, 3,	3, 3,	3, 3,	3, 3,	3, 3,	 //	0xe0 0xe0	to 0xef	3	byte
	4, 4,	4, 4,	4, 1,	1, 1,	1, 1,	1, 1,	1, 1,	1, 1	// 0xf0	0xf0 to	0xf4 4 byte, 0xf5	and	higher invalid
};


void TiXmlBase::ConvertUTF32ToUTF8(unsigned	long input,	char *output,	int	*length)
{
	const	unsigned long	BYTE_MASK	=	0xBF;
	const	unsigned long	BYTE_MARK	=	0x80;
	const	unsigned long	FIRST_BYTE_MARK[7] =
	{
		0x00,	0x00,	0xC0,	0xE0,	0xF0,	0xF8,	0xFC
	};

	if (input	<	0x80)
	{
		*length	=	1;
	}
	else if	(input < 0x800)
	{
		*length	=	2;
	}
	else if	(input < 0x10000)
	{
		*length	=	3;
	}
	else if	(input < 0x200000)
	{
		*length	=	4;
	}
	else
	{
		*length	=	0;
		return ;
	}	// This	code won't covert	this correctly anyway.

	output +=	 *length;

	// Scary scary fall	throughs.
	switch (*length)
	{
		case 4:
			--output;
			*output	=	(char)((input	|	BYTE_MARK) &BYTE_MASK);
			input	>>=	6;
		case 3:
			--output;
			*output	=	(char)((input	|	BYTE_MARK) &BYTE_MASK);
			input	>>=	6;
		case 2:
			--output;
			*output	=	(char)((input	|	BYTE_MARK) &BYTE_MASK);
			input	>>=	6;
		case 1:
			--output;
			*output	=	(char)(input | FIRST_BYTE_MARK[	*length]);
	}
}


 /*static*/int TiXmlBase::IsAlpha(unsigned char	anyByte, TiXmlEncoding /*encoding*/)
{
	// This	will only	work for low-ascii,	everything else	is assumed to	be a valid
	// letter. I'm not sure	this is	the	best approach, but it	is quite tricky	trying
	// to	figure out alhabetical vs. not across	encoding.	So take	a	very
	// conservative	approach.

	//	if ( encoding	== TIXML_ENCODING_UTF8 )
	//	{
	if (anyByte	<	127)
	{
		return isalpha(anyByte);
	}
	else
	{
		return 1;
	}
	// What	else to	do?	The	unicode	set	is huge...get	the	english	ones right.
	//	}
	//	else
	//	{
	//		return isalpha(	anyByte	);
	//	}
}


 /*static*/int TiXmlBase::IsAlphaNum(unsigned	char anyByte,	TiXmlEncoding	/*encoding*/)
{
	// This	will only	work for low-ascii,	everything else	is assumed to	be a valid
	// letter. I'm not sure	this is	the	best approach, but it	is quite tricky	trying
	// to	figure out alhabetical vs. not across	encoding.	So take	a	very
	// conservative	approach.

	//	if ( encoding	== TIXML_ENCODING_UTF8 )
	//	{
	if (anyByte	<	127)
	{
		return isalnum(anyByte);
	}
	else
	{
		return 1;
	}
	// What	else to	do?	The	unicode	set	is huge...get	the	english	ones right.
	//	}
	//	else
	//	{
	//		return isalnum(	anyByte	);
	//	}
}


class	TiXmlParsingData
{
		friend class TiXmlDocument;
	public:
		void Stamp(const char	*now,	TiXmlEncoding	encoding);

		const	TiXmlCursor	&Cursor()
		{
				return cursor;
		}

	private:
		// Only	used by	the	document!
		TiXmlParsingData(const char	*start,	int	_tabsize,	int	row, int col)
		{
				assert(start);
				stamp	=	start;
				tabsize	=	_tabsize;
				cursor.row = row;
				cursor.col = col;
		}

		TiXmlCursor	cursor;
		const	char *stamp;
		int	tabsize;
};


void TiXmlParsingData::Stamp(const char	*now,	TiXmlEncoding	encoding)
{
	assert(now);

	// Do	nothing	if the tabsize is	0.
	if (tabsize	<	1)
	{
		return ;
	}

	// Get the current row,	column.
	int	row	=	cursor.row;
	int	col	=	cursor.col;
	const	char *p	=	stamp;
	assert(p);

	while	(p < now)
	{
		// Treat p as	unsigned,	so we	have a happy compiler.
		const	unsigned char	*pU	=	(const unsigned	char*)p;

		// Code	contributed	by Fletcher	Dunn:	(modified	by lee)
		switch (*pU)
		{
			case 0:
				// We	*should* never get here, but in	case we	do,	don't
				// advance past	the	terminating	null character,	ever
				return ;

			case '\r':
				// bump	down to	the	next line
				++row;
				col	=	0;
				// Eat the character
				++p;

				// Check for \r\n	sequence,	and	treat	this as	a	single character
				if (*p ==	'\n')
				{
					++p;
				}
				break;

			case '\n':
				// bump	down to	the	next line
				++row;
				col	=	0;

				// Eat the character
				++p;

				// Check for \n\r	sequence,	and	treat	this as	a	single
				// character.	 (Yes, this	bizarre	thing	does occur still
				// on	some arcane	platforms...)
				if (*p ==	'\r')
				{
					++p;
				}
				break;

			case '\t':
				// Eat the character
				++p;

				// Skip	to next	tab	stop
				col	=	(col / tabsize + 1)	*tabsize;
				break;

			case TIXML_UTF_LEAD_0:
				if (encoding ==	TIXML_ENCODING_UTF8)
				{
					if (*(p	+	1) &&	*(p	+	2))
					{
						// In	these	cases, don't advance the column. These are
						// 0-width spaces.
						if (*(pU + 1)	== TIXML_UTF_LEAD_1	&& *(pU	+	2) ==	TIXML_UTF_LEAD_2)
						{
							p	+= 3;
						}
						else if	(*(pU	+	1) ==	0xbfU	&& *(pU	+	2) ==	0xbeU)
						{
							p	+= 3;
						}
						else if	(*(pU	+	1) ==	0xbfU	&& *(pU	+	2) ==	0xbfU)
						{
							p	+= 3;
						}
						else
						{
							p	+= 3;
							++col;
						}
						// A normal	character.
					}
				}
				else
				{
					++p;
					++col;
				}
				break;

			default:
				if (encoding ==	TIXML_ENCODING_UTF8)
				{
					// Eat the 1 to	4	byte utf8	character.
					int	step = TiXmlBase::utf8ByteTable[*((unsigned	char*)p)];
					if (step ==	0)
					{
						step = 1;
					}
					// Error case	from bad encoding, but handle	gracefully.
					p	+= step;

					// Just	advance	one	column,	of course.
					++col;
				}
				else
				{
					++p;
					++col;
				}
				break;
		}
	}
	cursor.row = row;
	cursor.col = col;
	assert(cursor.row	>=	-	1);
	assert(cursor.col	>=	-	1);
	stamp	=	p;
	assert(stamp);
}


const	char *TiXmlBase::SkipWhiteSpace(const	char *p, TiXmlEncoding encoding)
{
	if (!p ||	!	*p)
	{
		return 0;
	}
	if (encoding ==	TIXML_ENCODING_UTF8)
	{
		while	(*p)
		{
			const	unsigned char	*pU	=	(const unsigned	char*)p;

			// Skip	the	stupid Microsoft UTF-8 Byte	order	marks
			if (*(pU + 0)	== TIXML_UTF_LEAD_0	&& *(pU	+	1) ==	TIXML_UTF_LEAD_1 &&	*(pU + 2)	== TIXML_UTF_LEAD_2)
			{
				p	+= 3;
				continue;
			}
			else if	(*(pU	+	0) ==	TIXML_UTF_LEAD_0 &&	*(pU + 1)	== 0xbfU &&	*(pU + 2)	== 0xbeU)
			{
				p	+= 3;
				continue;
			}
			else if	(*(pU	+	0) ==	TIXML_UTF_LEAD_0 &&	*(pU + 1)	== 0xbfU &&	*(pU + 2)	== 0xbfU)
			{
				p	+= 3;
				continue;
			}

			if (IsWhiteSpace(*p) ||	 *p	== '\n'	||	*p ==	'\r')
			// Still using old rules for white space.
			{
				++p;
			}
			else
			{
				break;
			}
		}
	}
	else
	{
		while	(*p	&& IsWhiteSpace(*p)	||	*p ==	'\n' ||	 *p	== '\r')
		{
			++p;
		}
	}

	return p;
}

#ifdef TIXML_USE_STL
 /*static*/bool	TiXmlBase::StreamWhiteSpace(TIXML_ISTREAM	*in, TIXML_STRING	*tag)
{
	for	(;;)
	{
		if (!in->good())
		{
			return false;
		}

		int	c	=	in->peek();
		// At	this scope,	we can't get to	a	document.	So fail	silently.
		if (!IsWhiteSpace(c) ||	c	<= 0)
		{
			return true;
		}

		*tag +=	(char)in->get();
	}
}

 /*static*/bool	TiXmlBase::StreamTo(TIXML_ISTREAM	*in, int character,	TIXML_STRING *tag)
{
	//assert(	character	>	0	&& character < 128 );	 //	else it	won't	work in	utf-8
	while	(in->good())
	{
		int	c	=	in->peek();
		if (c	== character)
		{
			return true;
		}
		if (c	<= 0)
		// Silent	failure: can't get document	at this	scope
		{
			return false;
		}

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

const	char *TiXmlBase::ReadName(const	char *p, TIXML_STRING	*name, TiXmlEncoding encoding)
{
	*name	=	"";
	assert(p);

	// Names start with	letters	or underscores.
	// Of	course,	in unicode,	tinyxml	has	no idea	what a letter	*is*.	The
	// algorithm is	generous.
	//
	// After that, they	can	be letters,	underscores, numbers,
	// hyphens,	or colons. (Colons are valid ony for namespaces,
	// but tinyxml can't tell	namespaces from	names.)
	if (p	&&	*p &&	(IsAlpha((unsigned char) *p, encoding) ||	 *p	== '_'))
	{
		while	(p &&	 *p	&& (IsAlphaNum((unsigned char) *p, encoding) ||	 *p	== '_' ||	 *p	== '-' ||	 *p	== '.' ||	 *p	== ':'))
		{
			(*name)	+=	*p;
			++p;
		}
		return p;
	}
	return 0;
}

const	char *TiXmlBase::GetEntity(const char	*p,	char *value, int *length,	TiXmlEncoding	encoding)
{
	// Presume an	entity,	and	pull it	out.
	TIXML_STRING ent;
	int	i;
	*length	=	0;

	if (*(p	+	1) &&	*(p	+	1) ==	'#'	&& *(p + 2))
	{
		unsigned long	ucs	=	0;
		ptrdiff_t	delta	=	0;
		unsigned mult	=	1;

		if (*(p	+	2) ==	'x')
		{
			// Hexadecimal.
			if (!*(p + 3))
			{
				return 0;
			}

			const	char *q	=	p	+	3;
			q	=	strchr(q,	';');

			if (!q ||	!	*q)
			{
				return 0;
			}

			delta	=	q	-	p;
			--q;

			while	(*q	!= 'x')
			{
				if (*q >=	'0'	&&	*q <=	'9')
				{
					ucs	+= mult	*(*q - '0');
				}
				else if	(*q	>= 'a' &&	 *q	<= 'f')
				{
					ucs	+= mult	*(*q - 'a' + 10);
				}
				else if	(*q	>= 'A' &&	 *q	<= 'F')
				{
					ucs	+= mult	*(*q - 'A' + 10);
				}
				else
				{
					return 0;
				}
				mult *=	16;
				--q;
			}
		}
		else
		{
			// Decimal.
			if (!*(p + 2))
			{
				return 0;
			}

			const	char *q	=	p	+	2;
			q	=	strchr(q,	';');

			if (!q ||	!	*q)
			{
				return 0;
			}

			delta	=	q	-	p;
			--q;

			while	(*q	!= '#')
			{
				if (*q >=	'0'	&&	*q <=	'9')
				{
					ucs	+= mult	*(*q - '0');
				}
				else
				{
					return 0;
				}
				mult *=	10;
				--q;
			}
		}
		if (encoding ==	TIXML_ENCODING_UTF8)
		{
			// convert the UCS to	UTF-8
			ConvertUTF32ToUTF8(ucs,	value, length);
		}
		else
		{
			*value = (char)ucs;
			*length	=	1;
		}
		return p + delta + 1;
	}

	// Now try to	match	it.
	for	(i = 0;	i	<	NUM_ENTITY;	++i)
	{
		if (strncmp(entity[i].str, p,	entity[i].strLength) ==	0)
		{
			assert(strlen(entity[i].str) ==	entity[i].strLength);
			*value = entity[i].chr;
			*length	=	1;
			return (p	+	entity[i].strLength);
		}
	}

	// So	it wasn't	an entity, its unrecognized, or	something	like that.
	*value =	*p;	// Don't put back	the	last one,	since	we return	it!
	return p + 1;
}


bool TiXmlBase::StringEqual(const	char *p, const char	*tag,	bool ignoreCase, TiXmlEncoding encoding)
{
	assert(p);
	assert(tag);
	if (!p ||	!	*p)
	{
		assert(0);
		return false;
	}

	const	char *q	=	p;

	if (ignoreCase)
	{
		while	(*q	&&	*tag &&	ToLower(*q,	encoding)	== ToLower(*tag, encoding))
		{
			++q;
			++tag;
		}

		if (*tag ==	0)
		{
			return true;
		}
	}
	else
	{
		while	(*q	&&	*tag &&	 *q	==	*tag)
		{
			++q;
			++tag;
		}

		if (*tag ==	0)
		// Have	we found the end of	the	tag, and everything	equal?
		{
			return true;
		}
	}
	return false;
}

const	char *TiXmlBase::ReadText(const	char *p, TIXML_STRING	*text, bool	trimWhiteSpace,	const	char *endTag,	bool caseInsensitive,	TiXmlEncoding	encoding)
{
	*text	=	"";
	if (!trimWhiteSpace	 //	certain	tags always	keep whitespace
	 ||	!condenseWhiteSpace)
	// if	true,	whitespace is	always kept
	{
		// Keep	all	the	white	space.
		while	(p &&	 *p	&& !StringEqual(p, endTag, caseInsensitive,	encoding))
		{
			int	len;
			char cArr[4] =
			{
				0, 0,	0, 0
			};
			p	=	GetChar(p, cArr, &len, encoding);
			text->append(cArr, len);
		}
	}
	else
	{
		bool whitespace	=	false;

		// Remove	leading	white	space:
		p	=	SkipWhiteSpace(p,	encoding);
		while	(p &&	 *p	&& !StringEqual(p, endTag, caseInsensitive,	encoding))
		{
			if (*p ==	'\r' ||	 *p	== '\n')
			{
				whitespace = true;
				++p;
			}
			else if	(IsWhiteSpace(*p))
			{
				whitespace = true;
				++p;
			}
			else
			{
				// If	we've	found	whitespace,	add	it before	the
				// new character.	Any	whitespace just	becomes	a	space.
				if (whitespace)
				{
					(*text)	+= ' ';
					whitespace = false;
				}
				int	len;
				char cArr[4] =
				{
					0, 0,	0, 0
				};
				p	=	GetChar(p, cArr, &len, encoding);
				if (len	== 1)
				{
					(*text)	+= cArr[0];
				}
				// more	efficient
				else
				{
					text->append(cArr, len);
				}
			}
		}
	}
	return p + strlen(endTag);
}

#ifdef TIXML_USE_STL

void TiXmlDocument::StreamIn(TIXML_ISTREAM *in,	TIXML_STRING *tag)
{
	// The basic issue with	a	document is	that we	don't	know what	we're
	// streaming.	Read something presumed	to be	a	tag	(and hope),	then
	// identify	it,	and	call the appropriate stream	method on	the	tag.
	//
	// This	"pre-streaming"	will never read	the	closing	">"	so the
	// sub-tag can orient	itself.

	if (!StreamTo(in,	'<', tag))
	{
		SetError(TIXML_ERROR_PARSING_EMPTY,	0, 0,	TIXML_ENCODING_UNKNOWN);
		return ;
	}

	while	(in->good())
	{
		int	tagIndex = (int)tag->length();
		while	(in->good()	&& in->peek()	!= '>')
		{
			int	c	=	in->get();
			if (c	<= 0)
			{
				SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
				break;
			}
			(*tag) +=	(char)c;
		}

		if (in->good())
		{
			// We	now	have something we	presume	to be	a	node of
			// some	sort.	Identify it, and call	the	node to
			// continue	streaming.
			TiXmlNode	*node	=	Identify(tag->c_str()	+	tagIndex,	TIXML_DEFAULT_ENCODING);

			if (node)
			{
				node->StreamIn(in, tag);
				bool isElement = node->ToElement() !=	0;
				delete node;
				node = 0;

				// If	this is	the	root element,	we're	done.	Parsing	will be
				// done	by the >>	operator.
				if (isElement)
				{
					return ;
				}
			}
			else
			{
				SetError(TIXML_ERROR,	0, 0,	TIXML_ENCODING_UNKNOWN);
				return ;
			}
		}
	}
	// We	should have	returned sooner.
	SetError(TIXML_ERROR,	0, 0,	TIXML_ENCODING_UNKNOWN);
}

#endif

const	char *TiXmlDocument::Parse(const char	*p,	TiXmlParsingData *prevData,	TiXmlEncoding	encoding)
{
	ClearError();

	// Parse away, at	the	document level.	Since	a	document
	// contains	nothing	but	other	tags,	most of	what happens
	// here	is skipping	white	space.
	if (!p ||	!	*p)
	{
		SetError(TIXML_ERROR_DOCUMENT_EMPTY, 0,	0, TIXML_ENCODING_UNKNOWN);
		return 0;
	}

	// Note	that,	for	a	document,	this needs to	come
	// before	the	while	space	skip,	so that	parsing
	// starts	from the pointer we	are	given.
	location.Clear();
	if (prevData)
	{
		location.row = prevData->cursor.row;
		location.col = prevData->cursor.col;
	}
	else
	{
		location.row = 0;
		location.col = 0;
	}
	TiXmlParsingData data(p, TabSize(),	location.row,	location.col);
	location = data.Cursor();

	if (encoding ==	TIXML_ENCODING_UNKNOWN)
	{
		// Check for the Microsoft UTF-8 lead	bytes.
		const	unsigned char	*pU	=	(const unsigned	char*)p;
		if (*(pU + 0)	&& *(pU	+	0) ==	TIXML_UTF_LEAD_0 &&	*(pU + 1)	&& *(pU	+	1) ==	TIXML_UTF_LEAD_1 &&	*(pU + 2)	&& *(pU	+	2) ==	TIXML_UTF_LEAD_2)
		{
			encoding = TIXML_ENCODING_UTF8;
			useMicrosoftBOM	=	true;
		}
	}

	p	=	SkipWhiteSpace(p,	encoding);
	if (!p)
	{
		SetError(TIXML_ERROR_DOCUMENT_EMPTY, 0,	0, TIXML_ENCODING_UNKNOWN);
		return 0;
	}

	while	(p &&	 *p)
	{
		TiXmlNode	*node	=	Identify(p,	encoding);
		if (node)
		{
			p	=	node->Parse(p, &data,	encoding);
			LinkEndChild(node);
		}
		else
		{
			break;
		}

		// Did we	get	encoding info?
		if (encoding ==	TIXML_ENCODING_UNKNOWN &&	node->ToDeclaration())
		{
			TiXmlDeclaration *dec	=	node->ToDeclaration();
			const	char *enc	=	dec->Encoding();
			assert(enc);

			if (*enc ==	0)
			{
				encoding = TIXML_ENCODING_UTF8;
			}
			else if	(StringEqual(enc,	"UTF-8", true, TIXML_ENCODING_UNKNOWN))
			{
				encoding = TIXML_ENCODING_UTF8;
			}
			else if	(StringEqual(enc,	"UTF8",	true,	TIXML_ENCODING_UNKNOWN))
			{
				encoding = TIXML_ENCODING_UTF8;
			}
			// incorrect,	but	be nice
			else
			{
				encoding = TIXML_ENCODING_LEGACY;
			}
		}

		p	=	SkipWhiteSpace(p,	encoding);
	}

	// Was this	empty?
	if (!firstChild)
	{
		SetError(TIXML_ERROR_DOCUMENT_EMPTY, 0,	0, encoding);
		return 0;
	}

	// All is	well.
	return p;
}

void TiXmlDocument::SetError(int err,	const	char *pError,	TiXmlParsingData *data,	TiXmlEncoding	encoding)
{
	// The first error in	a	chain	is more	accurate - don't set again!
	if (error)
	{
		return ;
	}

	assert(err > 0 &&	err	<	TIXML_ERROR_STRING_COUNT);
	error	=	true;
	errorId	=	err;
	errorDesc	=	errorString[errorId];

	errorLocation.Clear();
	if (pError &&	data)
	{
		data->Stamp(pError,	encoding);
		errorLocation	=	data->Cursor();
	}
}


TiXmlNode	*TiXmlNode::Identify(const char	*p,	TiXmlEncoding	encoding)
{
	TiXmlNode	*returnNode	=	0;

	p	=	SkipWhiteSpace(p,	encoding);
	if (!p ||	!	*p ||	 *p	!= '<')
	{
		return 0;
	}

	TiXmlDocument	*doc = GetDocument();
	p	=	SkipWhiteSpace(p,	encoding);

	if (!p ||	!	*p)
	{
		return 0;
	}

	// What	is this	thing?
	// - Elements	start	with a letter	or underscore, but xml is	reserved.
	// - Comments: <!--
	// - Decleration:	<?xml
	// - Everthing else	is unknown to	tinyxml.
	//

	const	char *xmlHeader	=
	{
		"<?xml"
	};
	const	char *commentHeader	=
	{
		"<!--"
	};
	const	char *dtdHeader	=
	{
		"<!"
	};
	const	char *cdataHeader	=
	{
		"<![CDATA["
	};

	if (StringEqual(p, xmlHeader,	true,	encoding))
	{
		#ifdef DEBUG_PARSER
		TIXML_LOG("XML parsing Declaration\n");
		#endif
		returnNode = new TiXmlDeclaration();
	}
	else if	(StringEqual(p,	commentHeader, false,	encoding))
	{
		#ifdef DEBUG_PARSER
		TIXML_LOG("XML parsing Comment\n");
		#endif
		returnNode = new TiXmlComment();
	}
	else if	(StringEqual(p,	cdataHeader, false,	encoding))
	{
		#ifdef DEBUG_PARSER
		TIXML_LOG("XML parsing CDATA\n");
		#endif
		TiXmlText	*text	=	new	TiXmlText("");
		text->SetCDATA(true);
		returnNode = text;
	}
	else if	(StringEqual(p,	dtdHeader, false,	encoding))
	{
		#ifdef DEBUG_PARSER
		TIXML_LOG("XML parsing Unknown(1)\n");
		#endif
		returnNode = new TiXmlUnknown();
	}
	else if	(IsAlpha(*(p + 1), encoding) ||	*(p	+	1) ==	'_')
	{
		#ifdef DEBUG_PARSER
		TIXML_LOG("XML parsing Element\n");
		#endif
		returnNode = new TiXmlElement("");
	}
	else
	{
		#ifdef DEBUG_PARSER
		TIXML_LOG("XML parsing Unknown(2)\n");
		#endif
		returnNode = new TiXmlUnknown();
	}

	if (returnNode)
	{
		// Set the parent, so	it can report	errors
		returnNode->parent = this;
	}
	else
	{
		if (doc)
		{
			doc->SetError(TIXML_ERROR_OUT_OF_MEMORY, 0,	0, TIXML_ENCODING_UNKNOWN);
		}
	}
	return returnNode;
}

#ifdef TIXML_USE_STL

void TiXmlElement::StreamIn(TIXML_ISTREAM	*in, TIXML_STRING	*tag)
{
	// We're called	with some	amount of	pre-parsing. That	is,	some of	"this"
	// element is	in "tag".	Go ahead and stream	to the closing ">"
	while	(in->good())
	{
		int	c	=	in->get();
		if (c	<= 0)
		{
			TiXmlDocument	*document	=	GetDocument();
			if (document)
			{
				document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
			}
			return ;
		}
		(*tag) +=	(char)c;

		if (c	== '>')
		{
			break;
		}
	}

	if (tag->length()	<	3)
	{
		return ;
	}

	// Okay...if we	are	a	"/>" tag,	then we're done. We've read	a	complete tag.
	// If	not, identify	and	stream.

	if (tag->at(tag->length()	-	1) ==	'>'	&& tag->at(tag->length() - 2)	== '/')
	{
		// All good!
		return ;
	}
	else if	(tag->at(tag->length() - 1)	== '>')
	{
		// There is	more.	Could	be:
		//		text
		//		closing	tag
		//		another	node.
		for	(;;)
		{
			StreamWhiteSpace(in, tag);

			// Do	we have	text?
			if (in->good() &&	in->peek() !=	'<')
			{
				// Yep,	text.
				TiXmlText	text("");
				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 = (int)tag->length();

			bool closingTag	=	false;
			bool firstCharFound	=	false;

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

				int	c	=	in->peek();
				if (c	<= 0)
				{
					TiXmlDocument	*document	=	GetDocument();
					if (document)
					{
						document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
					}
					return ;
				}

				if (c	== '>')
				{
					break;
				}

				*tag +=	(char)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)
			{
				if (!in->good())
				{
					return ;
				}

				int	c	=	in->get();
				if (c	<= 0)
				{
					TiXmlDocument	*document	=	GetDocument();
					if (document)
					{
						document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
					}
					return ;
				}
				assert(c ==	'>');
				*tag +=	(char)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, TIXML_DEFAULT_ENCODING);
				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, TiXmlParsingData	*data, TiXmlEncoding encoding)
{
	p	=	SkipWhiteSpace(p,	encoding);
	TiXmlDocument	*document	=	GetDocument();

	if (!p ||	!	*p)
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_PARSING_ELEMENT,	0, 0,	encoding);
		}
		return 0;
	}

	if (data)
	{
		data->Stamp(p, encoding);
		location = data->Cursor();
	}

	if (*p !=	'<')
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_PARSING_ELEMENT,	p, data, encoding);
		}
		return 0;
	}

	p	=	SkipWhiteSpace(p + 1,	encoding);

	// Read	the	name.
	const	char *pErr = p;

	p	=	ReadName(p,	&value,	encoding);
	if (!p ||	!	*p)
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_FAILED_TO_READ_ELEMENT_NAME,	pErr,	data,	encoding);
		}
		return 0;
	}

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

	// Check for and read	attributes.	Also look	for	an empty
	// tag or	an end tag.
	while	(p &&	 *p)
	{
		pErr = p;
		p	=	SkipWhiteSpace(p,	encoding);
		if (!p ||	!	*p)
		{
			if (document)
			{
				document->SetError(TIXML_ERROR_READING_ATTRIBUTES, pErr, data, encoding);
			}
			return 0;
		}
		if (*p ==	'/')
		{
			++p;
			// Empty tag.
			if (*p !=	'>')
			{
				if (document)
				{
					document->SetError(TIXML_ERROR_PARSING_EMPTY,	p, data, encoding);
				}
				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, data, encoding);	// 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,	encoding))
			{
				p	+= endTag.length();
				return p;
			}
			else
			{
				if (document)
				{
					document->SetError(TIXML_ERROR_READING_END_TAG,	p, data, encoding);
				}
				return 0;
			}
		}
		else
		{
			// Try to	read an	attribute:
			TiXmlAttribute *attrib = new TiXmlAttribute();
			if (!attrib)
			{
				if (document)
				{
					document->SetError(TIXML_ERROR_OUT_OF_MEMORY,	pErr,	data,	encoding);
				}
				return 0;
			}

			attrib->SetDocument(document);
			const	char *pErr = p;
			p	=	attrib->Parse(p, data, encoding);

			if (!p ||	!	*p)
			{
				if (document)
				{
					document->SetError(TIXML_ERROR_PARSING_ELEMENT,	pErr,	data,	encoding);
				}
				delete attrib;
				return 0;
			}

			// Handle	the	strange	case of	double attributes:
			TiXmlAttribute *node = attributeSet.Find(attrib->NameTStr());
			if (node)
			{
				node->SetValue(attrib->Value());
				delete attrib;
				return 0;
			}

			attributeSet.Add(attrib);
		}
	}
	return p;
}


const	char *TiXmlElement::ReadValue(const	char *p, TiXmlParsingData	*data, TiXmlEncoding encoding)
{
	TiXmlDocument	*document	=	GetDocument();

	// Read	in text	and	elements in	any	order.
	const	char *pWithWhiteSpace	=	p;
	p	=	SkipWhiteSpace(p,	encoding);

	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,	0, 0,	encoding);
				}
				return 0;
			}

			if (TiXmlBase::IsWhiteSpaceCondensed())
			{
				p	=	textNode->Parse(p, data, encoding);
			}
			else
			{
				// Special case: we	want to	keep the white space
				// so	that leading spaces	aren't removed.
				p	=	textNode->Parse(pWithWhiteSpace, data, encoding);
			}

			if (!textNode->Blank())
			{
				LinkEndChild(textNode);
			}
			else
			{
				delete textNode;
			}
		}
		else
		{
			// We	hit	a	'<'
			// Have	we hit a new element or	an end tag?	This could also	be
			// a TiXmlText in	the	"CDATA"	style.
			if (StringEqual(p, "</", false,	encoding))
			{
				return p;
			}
			else
			{
				TiXmlNode	*node	=	Identify(p,	encoding);
				if (node)
				{
					p	=	node->Parse(p, data, encoding);
					LinkEndChild(node);
				}
				else
				{
					return 0;
				}
			}
		}
		pWithWhiteSpace	=	p;
		p	=	SkipWhiteSpace(p,	encoding);
	}

	if (!p)
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_READING_ELEMENT_VALUE,	0, 0,	encoding);
		}
	}
	return p;
}


#ifdef TIXML_USE_STL
void TiXmlUnknown::StreamIn(TIXML_ISTREAM	*in, TIXML_STRING	*tag)
{
	while	(in->good())
	{
		int	c	=	in->get();
		if (c	<= 0)
		{
			TiXmlDocument	*document	=	GetDocument();
			if (document)
			{
				document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
			}
			return ;
		}
		(*tag) +=	(char)c;

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


const	char *TiXmlUnknown::Parse(const	char *p, TiXmlParsingData	*data, TiXmlEncoding encoding)
{
	TiXmlDocument	*document	=	GetDocument();
	p	=	SkipWhiteSpace(p,	encoding);

	if (data)
	{
		data->Stamp(p, encoding);
		location = data->Cursor();
	}
	if (!p ||	!	*p ||	 *p	!= '<')
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_PARSING_UNKNOWN,	p, data, encoding);
		}
		return 0;
	}
	++p;
	value	=	"";

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

	if (!p)
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_PARSING_UNKNOWN,	0, 0,	encoding);
		}
	}
	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();
		if (c	<= 0)
		{
			TiXmlDocument	*document	=	GetDocument();
			if (document)
			{
				document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
			}
			return ;
		}

		(*tag) +=	(char)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, TiXmlParsingData	*data, TiXmlEncoding encoding)
{
	TiXmlDocument	*document	=	GetDocument();
	value	=	"";

	p	=	SkipWhiteSpace(p,	encoding);

	if (data)
	{
		data->Stamp(p, encoding);
		location = data->Cursor();
	}
	const	char *startTag = "<!--";
	const	char *endTag = "-->";

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


const	char *TiXmlAttribute::Parse(const	char *p, TiXmlParsingData	*data, TiXmlEncoding encoding)
{
	p	=	SkipWhiteSpace(p,	encoding);
	if (!p ||	!	*p)
	{
		return 0;
	}

	int	tabsize	=	4;
	if (document)
	{
		tabsize	=	document->TabSize();
	}

	if (data)
	{
		data->Stamp(p, encoding);
		location = data->Cursor();
	}
	// Read	the	name,	the	'='	and	the	value.
	const	char *pErr = p;
	p	=	ReadName(p,	&name, encoding);
	if (!p ||	!	*p)
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_READING_ATTRIBUTES, pErr, data, encoding);
		}
		return 0;
	}
	p	=	SkipWhiteSpace(p,	encoding);
	if (!p ||	!	*p ||	 *p	!= '=')
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_READING_ATTRIBUTES, p,	data,	encoding);
		}
		return 0;
	}

	++p; //	skip '='
	p	=	SkipWhiteSpace(p,	encoding);
	if (!p ||	!	*p)
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_READING_ATTRIBUTES, p,	data,	encoding);
		}
		return 0;
	}

	const	char *end;

	if (*p ==	'\'')
	{
		++p;
		end	=	"\'";
		p	=	ReadText(p,	&value,	false, end,	false, encoding);
	}
	else if	(*p	== '"')
	{
		++p;
		end	=	"\"";
		p	=	ReadText(p,	&value,	false, end,	false, encoding);
	}
	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
		 &&	!IsWhiteSpace(*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)
{
	if (cdata)
	{
		int	c	=	in->get();
		if (c	<= 0)
		{
			TiXmlDocument	*document	=	GetDocument();
			if (document)
			{
				document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
			}
			return ;
		}

		(*tag) +=	(char)c;

		if (c	== '>' &&	tag->at(tag->length()	-	2) ==	']'	&& tag->at(tag->length() - 3)	== ']')
		{
			// All is	well.
			return ;
		}
	}
	else
	{
		while	(in->good())
		{
			int	c	=	in->peek();
			if (c	== '<')
			{
				return ;
			}
			if (c	<= 0)
			{
				TiXmlDocument	*document	=	GetDocument();
				if (document)
				{
					document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
				}
				return ;
			}

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

const	char *TiXmlText::Parse(const char	*p,	TiXmlParsingData *data,	TiXmlEncoding	encoding)
{
	value	=	"";
	TiXmlDocument	*document	=	GetDocument();

	if (data)
	{
		data->Stamp(p, encoding);
		location = data->Cursor();
	}

	const	char *const	startTag = "<![CDATA[";
	const	char *const	endTag = "]]>";

	if (cdata	|| StringEqual(p,	startTag,	false, encoding))
	{
		cdata	=	true;

		if (!StringEqual(p,	startTag,	false, encoding))
		{
			document->SetError(TIXML_ERROR_PARSING_CDATA,	p, data, encoding);
			return 0;
		}
		p	+= strlen(startTag);

		// Keep	all	the	white	space, ignore	the	encoding,	etc.
		while	(p &&	 *p	&& !StringEqual(p, endTag, false,	encoding))
		{
			value	+=	*p;
			++p;
		}

		TIXML_STRING dummy;
		p	=	ReadText(p,	&dummy,	false, endTag, false,	encoding);
		return p;
	}
	else
	{
		bool ignoreWhite = true;

		const	char *end	=	"<";
		p	=	ReadText(p,	&value,	ignoreWhite, end,	false, encoding);
		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();
		if (c	<= 0)
		{
			TiXmlDocument	*document	=	GetDocument();
			if (document)
			{
				document->SetError(TIXML_ERROR_EMBEDDED_NULL,	0, 0,	TIXML_ENCODING_UNKNOWN);
			}
			return ;
		}
		(*tag) +=	(char)c;

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

const	char *TiXmlDeclaration::Parse(const	char *p, TiXmlParsingData	*data, TiXmlEncoding _encoding)
{
	p	=	SkipWhiteSpace(p,	_encoding);
	// Find	the	beginning, find	the	end, and look	for
	// the stuff in-between.
	TiXmlDocument	*document	=	GetDocument();
	if (!p ||	!	*p ||	!StringEqual(p,	"<?xml", true, _encoding))
	{
		if (document)
		{
			document->SetError(TIXML_ERROR_PARSING_DECLARATION,	0, 0,	_encoding);
		}
		return 0;
	}
	if (data)
	{
		data->Stamp(p, _encoding);
		location = data->Cursor();
	}
	p	+= 5;

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

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

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

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

};
NXU_tinyxmlparser.cpp
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