Utilisateur : Fcolin Date : 16/06/00 Heure : 10:14 Créé (vss 1)

1 files changed, 1757 insertions, 0 deletions

diff --git a/Ivy/Regexp.cxx b/Ivy/Regexp.cxx
new file mode 100644
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+// Win32 porting notes.

+

+#if defined( _MBCS )

+#pragma message( __FILEINFO__ "This code is broken under _MBCS, " \

+				 "see the comments at the top of this file." )

+#endif //_MBCS

+//

+//

+// In case this isn't obvious from the later comments this is an ALTERED

+// version of the software. If you like my changes then cool, but nearly

+// all of the functionality here is derived from Henry Spencer's original

+// work.

+//

+// This code should work correctly under both _SBCS and _UNICODE, I did

+// start working on making it work with _MBCS but gave up after a while

+// since I don't need this particular port and it's not going to be as

+// straight forward as the other two.

+//

+// The problem stems from the compiled program being stored as TCHARS,

+// the individual items need to be wide enough to hold whatever character

+// is thrown at them, but currently they are accessed as an array of

+// whatever size integral type is appropriate.  _MBCS would cause this

+// to be char, but at times it would need to be larger.  This would

+// require making the program be an array of short with the appropriate

+// conversions used everywhere.  Certainly it's doable, but it's a pain.

+// What's worse is that the current code will compile and run under _MBCS,

+// only breaking when it gets wide characters thrown against it.

+//

+// I've marked at least one bit of code with #pragma messages, I may not

+// get all of them, but they should be a start

+//

+// Guy Gascoigne - Piggford (ggp@bigfoot.com) Friday, February 27, 1998

+

+

+// regcomp and regexec -- regsub and regerror are elsewhere

+// @(#)regexp.c	1.3 of 18 April 87

+//

+//	Copyright (c) 1986 by University of Toronto.

+//	Written by Henry Spencer.  Not derived from licensed software.

+//

+//	Permission is granted to anyone to use this software for any

+//	purpose on any computer system, and to redistribute it freely,

+//	subject to the following restrictions:

+//

+//	1. The author is not responsible for the consequences of use of

+//		this software, no matter how awful, even if they arise

+//		from defects in it.

+//

+//	2. The origin of this software must not be misrepresented, either

+//		by explicit claim or by omission.

+//

+//	3. Altered versions must be plainly marked as such, and must not

+//		be misrepresented as being the original software.

+// *** THIS IS AN ALTERED VERSION.  It was altered by John Gilmore,

+// *** hoptoad!gnu, on 27 Dec 1986, to add \< and \> for word-matching

+// *** as in BSD grep and ex.

+// *** THIS IS AN ALTERED VERSION.  It was altered by John Gilmore,

+// *** hoptoad!gnu, on 28 Dec 1986, to optimize characters quoted with \.

+// *** THIS IS AN ALTERED VERSION.  It was altered by James A. Woods,

+// *** ames!jaw, on 19 June 1987, to quash a regcomp() redundancy.

+// *** THIS IS AN ALTERED VERSION.  It was altered by Geoffrey Noer,

+// *** THIS IS AN ALTERED VERSION.  It was altered by Guy Gascoigne - Piggford

+// *** guy@wyrdrune.com, on 15 March 1998, porting it to C++ and converting

+// *** it to be the engine for the Regexp class

+//

+// Beware that some of this code is subtly aware of the way operator

+// precedence is structured in regular expressions.  Serious changes in

+// regular-expression syntax might require a total rethink.

+

+#include "stdafx.h"

+#include "regexp.h"

+

+// The first byte of the regexp internal "program" is actually this magic

+// number; the start node begins in the second byte.

+

+const char	MAGIC = '\234';

+

+#pragma warning( disable : 4711 )	// automatic inline selected

+

+// The "internal use only" fields in regexp.h are present to pass info from

+// compile to execute that permits the execute phase to run lots faster on

+// simple cases.  They are:

+//

+// regstart	char that must begin a match; '\0' if none obvious

+// reganch	is the match anchored (at beginning-of-line only)?

+// regmust	string (pointer into program) that match must include, or NULL

+// regmlen	length of regmust string

+//

+// Regstart and reganch permit very fast decisions on suitable starting

+// points for a match, cutting down the work a lot.  Regmust permits fast

+// rejection of lines that cannot possibly match.  The regmust tests are

+// costly enough that regcomp() supplies a regmust only if the

+// r.e. contains something potentially expensive (at present, the only

+// such thing detected is * or + at the start of the r.e., which can

+// involve a lot of backup).  Regmlen is supplied because the test in

+// regexec() needs it and regcomp() is computing it anyway.

+

+// Structure for regexp "program".  This is essentially a linear encoding

+// of a nondeterministic finite-state machine (aka syntax charts or

+// "railroad normal form" in parsing technology).  Each node is an opcode

+// plus a "next" pointer, possibly plus an operand.  "Next" pointers of

+// all nodes except BRANCH implement concatenation; a "next" pointer with

+// a BRANCH on both ends of it is connecting two alternatives.  (Here we

+// have one of the subtle syntax dependencies: an individual BRANCH (as

+// opposed to a collection of them) is never concatenated with anything

+// because of operator precedence.)  The operand of some types of node is

+// a literal string; for others, it is a node leading into a sub-FSM.  In

+// particular, the operand of a BRANCH node is the first node of the

+// branch.  (NB this is *not* a tree structure: the tail of the branch

+// connects to the thing following the set of BRANCHes.)  The opcodes

+// are:

+

+enum {

+//  definition	number		opnd?	meaning

+	END		=	0,		//	no		End of program.

+	BOL		=	1,		//	no		Match beginning of line.

+	EOL		=	2,		//	no		Match end of line.

+	ANY		=	3,		//	no		Match any character.

+	ANYOF	=	4,		//	str		Match any of these.

+	ANYBUT	=	5,		//	str		Match any but one of these.

+	BRANCH	=	6,		//	node	Match this, or the next..\&.

+	BACK	=	7,		//	no		"next" ptr points backward.

+	EXACTLY	=	8,		//	str		Match this string.

+	NOTHING	=	9,		//	no		Match empty string.

+	STAR	=	10,		//	node	Match this 0 or more times.

+	PLUS	=	11,		//	node	Match this 1 or more times.

+	WORDA	=	12,		//	no		Match "" at wordchar, where prev is nonword

+	WORDZ	=	13,		//	no		Match "" at nonwordchar, where prev is word

+	OPEN	=	20,		//	no		Sub-RE starts here.

+						//			OPEN+1 is number 1, etc.

+	CLOSE	=	40		//	no		Analogous to OPEN.

+};

+

+// Opcode notes:

+//

+// BRANCH	The set of branches constituting a single choice are hooked

+//		together with their "next" pointers, since precedence prevents

+//		anything being concatenated to any individual branch.  The

+//		"next" pointer of the last BRANCH in a choice points to the

+//		thing following the whole choice.  This is also where the

+//		final "next" pointer of each individual branch points; each

+//		branch starts with the operand node of a BRANCH node.

+//

+// BACK		Normal "next" pointers all implicitly point forward; BACK

+//		exists to make loop structures possible.

+//

+// STAR,PLUS	'?', and complex '*' and '+', are implemented as circular

+//		BRANCH structures using BACK.  Simple cases (one character

+//		per match) are implemented with STAR and PLUS for speed

+//		and to minimize recursive plunges.

+//

+// OPEN,CLOSE	...are numbered at compile time.

+

+// A node is one char of opcode followed by two chars of "next" pointer.

+// "Next" pointers are stored as two 8-bit pieces, high order first.  The

+// value is a positive offset from the opcode of the node containing it.

+// An operand, if any, simply follows the node.  (Note that much of the

+// code generation knows about this implicit relationship.)

+//

+// Using two bytes for the "next" pointer is vast overkill for most things,

+// but allows patterns to get big without disasters.

+

+

+enum

+{

+	REGERR_SENTINEL_VALUE = 0,

+	REGERR_NULLARG = 1, REGERR_CORRUPTED, REGERR_CORRUPTION, REGERR_CORRUPTED_POINTERS,

+	REGERR_BAD_REGREPEAT, REGERR_CORRUPTED_OPCODE, REGERR_NULL_TO_REGSUB,

+	REGERR_DAMAGED_REGEXP_REGSUB, REGERR_DAMAGED_MATCH_STRING, REGERR_NULL_TO_REGCOMP,

+	REGERR_TO_BIG, REGERR_TO_MANY_PAREN, REGERR_UNTERMINATED_PAREN, REGERR_UNMATCHED_PAREN,

+	REGERR_INTERNAL_ERROR_JUNK, REGERR_OP_COULD_BE_EMPTY, REGERR_NESTED_OP, REGERR_INVALID_RANGE,

+	REGERR_UNMATCHED_BRACE, REGERR_INTERNAL_UNEXPECTED_CHAR, REGERR_OP_FOLLOWS_NOTHING,

+	REGERR_TRAILING_ESC, REGERR_INTERNAL_STRSCSPN, REGERR_NO_REGEXP

+};

+

+struct regErr

+{

+	int m_id;

+	const char * m_err;

+} errors[] = {

+	{ REGERR_NULLARG,					"NULL argument to regexec"  },

+	{ REGERR_CORRUPTED,					"corrupted regexp"  },

+	{ REGERR_CORRUPTION,				"regexp corruption"  },

+	{ REGERR_CORRUPTED_POINTERS,		"corrupted pointers"  },

+	{ REGERR_BAD_REGREPEAT,				"internal error: bad call of regrepeat"  },

+	{ REGERR_CORRUPTED_OPCODE,			"corrupted opcode"  },

+	{ REGERR_NULL_TO_REGSUB,			"NULL parm to regsub"  },

+	{ REGERR_DAMAGED_REGEXP_REGSUB,		"damaged regexp fed to regsub"  },

+	{ REGERR_DAMAGED_MATCH_STRING,		"damaged match string"  },

+	{ REGERR_NULL_TO_REGCOMP,			"NULL argument to regcomp"  },

+	{ REGERR_TO_BIG,					"regexp too big"  },

+	{ REGERR_TO_MANY_PAREN,				"too many ()"  },

+	{ REGERR_UNTERMINATED_PAREN,		"unterminated ()"  },

+	{ REGERR_UNMATCHED_PAREN,			"unmatched ()" },

+	{ REGERR_INTERNAL_ERROR_JUNK,		"internal error: junk on end"  },

+	{ REGERR_OP_COULD_BE_EMPTY,			"*+ operand could be empty"  },

+	{ REGERR_NESTED_OP,					"nested *?+"  },

+	{ REGERR_INVALID_RANGE,				"invalid [] range"  },

+	{ REGERR_UNMATCHED_BRACE,			"unmatched []"  },

+	{ REGERR_INTERNAL_UNEXPECTED_CHAR,	"internal error: \\0|) unexpected"  },

+	{ REGERR_OP_FOLLOWS_NOTHING,		"?+* follows nothing"  },

+	{ REGERR_TRAILING_ESC,				"trailing \\"  },

+	{ REGERR_INTERNAL_STRSCSPN,			"internal error: strcspn 0"  },

+	{ REGERR_NO_REGEXP,					"NULL regexp"  },

+	{ REGERR_SENTINEL_VALUE,			"Unknown error" }							// must be last value

+};

+

+// Flags to be passed up and down.

+

+enum {

+	HASWIDTH	=	01,	// Known never to match null string.

+	SIMPLE		=	02,	// Simple enough to be STAR/PLUS operand.

+	SPSTART		=	04,	// Starts with * or +.

+	WORST		=	0	// Worst case.

+};

+

+///////////////////////////////////////////////////////////////////////////////

+

+class CRegErrorHandler

+{

+	friend Regexp;

+	mutable string m_szError;

+	static const char * FindErr( int id );

+protected:

+	void ClearErrorString() const;

+	void regerror( const char * s ) const;

+	void regerror( int id ) const;

+public:

+	CRegErrorHandler() { }

+	CRegErrorHandler( const CRegErrorHandler & reh ) : m_szError( reh.m_szError ) {}

+

+	const string & GetErrorString() const;

+};

+

+void CRegErrorHandler::regerror( const char * s ) const

+{

+	TRACE( "regerror: %s\n", s );

+	m_szError = s;

+}

+

+void CRegErrorHandler::regerror( int id ) const

+{

+	regerror( FindErr( id ) );

+}

+

+const string & CRegErrorHandler::GetErrorString() const

+{

+	return m_szError;

+}

+

+void CRegErrorHandler::ClearErrorString() const

+{

+	m_szError = "" ;

+}

+

+const char * CRegErrorHandler::FindErr( int id )

+{

+	for ( struct regErr * perr = errors; perr->m_id != REGERR_SENTINEL_VALUE; perr++ )

+		if ( perr->m_id == id )

+			return perr->m_err;

+

+	return perr->m_err;		// since we've fallen off the array, perr->m_id == 0

+}

+

+///////////////////////////////////////////////////////////////////////////////

+

+// All of the functions required to directly access the 'program'

+class CRegProgramAccessor : public CRegErrorHandler

+{

+public:

+	static inline char OP( char * p )

+	{

+		return (*(p));

+	}

+	static inline char * OPERAND( char * p )

+	{

+		return p + 3;

+	}

+	static inline char * regnext( char * p )

+	{

+		const short &offset = *((short*)(p+1));

+

+		if (offset == 0)

+			return(NULL);

+		

+		return((OP(p) == BACK) ? p-offset : p+offset);

+	}

+#ifdef _RE_DEBUG

+	char * CRegProgramAccessor::regprop( char * op );

+#endif

+};

+

+///////////////////////////////////////////////////////////////////////////////

+

+// The internal interface to the regexp, wrapping the compilation as well as the

+// execution of the regexp (matching)

+

+class regexp : public CRegProgramAccessor

+{

+	friend class CRegExecutor;

+	friend class Regexp;

+	

+	int m_programSize;

+	char * startp[Regexp::NSUBEXP];

+	char * endp[Regexp::NSUBEXP];

+	char regstart;		// Internal use only.

+	char reganch;		// Internal use only.

+	char * regmust;		// Internal use only.

+	int regmlen;		// Internal use only.

+	char * program;

+	

+	bool status;

+	int count;			// used by Regexp to manage the reference counting of regexps

+	int numSubs;

+public:

+	

+	regexp( const char * exp, bool iCase );

+	regexp( const regexp & r );

+	~regexp();

+	

+	void ignoreCase( const char * in, char * out );

+	

+	bool regcomp( const char * exp );

+	bool regexec( const char * string );

+	bool Status() const { return status; }

+

+	string GetReplaceString( const char* sReplaceExp ) const;

+

+	regexp * getCopy();

+

+#ifdef _RE_DEBUG

+	void  regdump();

+#endif

+	

+#ifdef _DEBUG

+	string m_originalPattern;

+	string m_modifiedPattern;

+#endif

+};

+

+///////////////////////////////////////////////////////////////////////////////

+// Compile / Validate the regular expression - ADT

+

+class CRegCompilerBase : public CRegProgramAccessor

+{

+public:

+	CRegCompilerBase( const char * parse );

+

+	char * reg(int paren, int *flagp);

+protected:

+	char * regparse;	// Input-scan pointer. 

+	int regnpar;		// () count. 

+

+	char * regbranch(int *flagp);

+	char * regpiece(int *flagp);

+	char * regatom(int *flagp);

+	inline bool ISREPN( char c )	{ return ((c) == '*' || (c) == '+' || (c) == '?'); }

+

+	virtual void regc(int c) = 0;

+	virtual char * regnode(int op) = 0;

+	virtual void reginsert(char op, char * opnd) = 0;

+	virtual void regtail(char * p, char * val) = 0;

+	virtual void regoptail(char * p, char * val) = 0;

+};

+

+///////////////////////////////////////////////////////////////////////////////

+// First pass over the expression, testing for validity and returning the 

+// program size

+

+class CRegValidator : public CRegCompilerBase

+{

+public:

+	CRegValidator( const char * parse );

+

+	inline long Size() const { return regsize; }

+private:

+	long regsize;		// Code size. 

+	char regdummy[3];	// NOTHING, 0 next ptr 

+protected:

+	char * regnode(int) { regsize += 3; return regdummy; }

+	void regc(int) { regsize++; }

+	void reginsert(char, char *) { regsize += 3; }

+	void regtail(char *, char *) { return; }

+	void regoptail(char *, char *) { return; }

+};

+

+///////////////////////////////////////////////////////////////////////////////

+// Second pass, actually generating the program

+

+class CRegCompiler : public CRegCompilerBase

+{

+public:

+	CRegCompiler( const char * parse, char * prog );

+private:

+	char * regcode;

+protected:

+	// regc - emit (if appropriate) a byte of code

+	void regc(int b)

+	{

+		*regcode++ = (char)b;

+	}

+	char * regnode(int op);

+	void reginsert(char op, char * opnd);

+	void regtail(char * p, char * val);

+	void regoptail(char * p, char * val);

+};

+

+// regnode - emit a node

+char * CRegCompiler::regnode(int op)

+{

+	char * const ret = regcode;

+

+	char * ptr = ret;

+	*ptr++ = (char)op;

+	*ptr++ = '\0';		// Null next pointer. 

+	*ptr++ = '\0';

+	regcode = ptr;

+

+	return(ret);

+}

+

+// reginsert - insert an operator in front of already-emitted operand

+//

+// Means relocating the operand.

+void CRegCompiler::reginsert(char op, char * opnd)

+{

+	char * place;

+

+	(void) memmove(opnd+3, opnd, (size_t)((regcode - opnd)*sizeof(char)));

+	regcode += 3;

+

+	place = opnd;		// Op node, where operand used to be.

+	*place++ = op;

+	*place++ = '\0';

+	*place++ = '\0';

+}

+

+// regtail - set the next-pointer at the end of a node chain

+void CRegCompiler::regtail(char * p, char * val)

+{

+	char * scan;

+	char * temp;

+

+	// Find last node. 

+	for (scan = p; (temp = regnext(scan)) != NULL; scan = temp)

+		continue;

+

+	*((short *)(scan+1)) = (short)((OP(scan) == BACK) ? scan - val : val - scan);

+}

+

+// regoptail - regtail on operand of first argument; nop if operandless

+void CRegCompiler::regoptail(char * p, char * val)

+{

+	// "Operandless" and "op != BRANCH" are synonymous in practice. 

+	if (OP(p) == BRANCH)

+		regtail(OPERAND(p), val);

+}

+

+///////////////////////////////////////////////////////////////////////////////

+

+CRegCompilerBase::CRegCompilerBase( const char * parse )

+	: regparse( (char *)parse ),

+	regnpar(1)

+{

+}

+

+CRegValidator::CRegValidator( const char * parse )

+	: CRegCompilerBase( parse ),

+	regsize(0)

+{

+	regc(MAGIC);

+	regdummy[0] = NOTHING;

+	regdummy[1] = regdummy[2] = 0;

+}

+

+CRegCompiler::CRegCompiler( const char * parse, char * prog )

+	: CRegCompilerBase( parse ),

+	regcode(prog)

+{

+	regc(MAGIC);

+}

+

+///////////////////////////////////////////////////////////////////////////////

+

+regexp::regexp( const char * exp, bool iCase )

+	: regstart(0),

+	reganch(0),

+	regmust(0),

+	regmlen(0),

+	program(0),

+	m_programSize(0)

+{

+#if _DEBUG

+	m_originalPattern = exp;		// keep a version of the pattern for debugging

+#endif

+

+	if ( iCase )

+	{

+		char * out = new char[(strlen( exp ) * 4) + 1];

+		ignoreCase( exp, out );

+

+#if _DEBUG

+		m_modifiedPattern = out;	// and the modified version if there is one

+#endif

+		status = regcomp( out );

+		delete [] out;

+	}

+	else

+		status = regcomp( exp );

+

+	count = numSubs = 0;

+}

+

+regexp::regexp( const regexp & orig )

+	: regstart(orig.regstart),

+	reganch(orig.reganch),

+	regmlen(orig.regmlen),

+	m_programSize(orig.m_programSize),

+	numSubs(orig.numSubs),

+	regmust(0)

+{

+#if _DEBUG

+	m_originalPattern = orig.m_originalPattern;

+	m_modifiedPattern = orig.m_modifiedPattern;

+#endif

+	status = orig.status;

+	count = 0;

+	program = new char[m_programSize];

+	memcpy( program, orig.program, m_programSize * sizeof( char ) );

+	if ( orig.regmust )

+		regmust = program + ( orig.regmust - orig.program );

+

+	for ( int i = Regexp::NSUBEXP - 1; i >= 0; i--)

+	{

+		startp[i] = orig.startp[i];

+		endp[i] = orig.endp[i];

+	}

+}

+

+regexp::~regexp()

+{

+	delete [] program;

+}

+

+

+// regcomp - compile a regular expression into internal code

+//

+// We can't allocate space until we know how big the compiled form will

+// be, but we can't compile it (and thus know how big it is) until we've

+// got a place to put the code.  So we cheat: we compile it twice, once

+// with code generation turned off and size counting turned on, and once

+// "for real".  This also means that we don't allocate space until we are

+// sure that the thing really will compile successfully, and we never

+// have to move the code and thus invalidate pointers into it.  (Note

+// that it has to be in one piece because free() must be able to free it

+// all.)

+//

+// Beware that the optimization-preparation code in here knows about some

+// of the structure of the compiled regexp.

+

+bool regexp::regcomp(const char * exp)

+{

+	char * scan;

+	int flags;

+

+	if (exp == NULL)

+	{

+		regerror( REGERR_NULL_TO_REGCOMP );

+		return NULL;

+	}

+

+	// First pass: determine size, legality.

+	CRegValidator tester( exp );

+

+	if (tester.reg(0, &flags) == NULL)

+		return false;

+

+	// Small enough for pointer-storage convention? 

+	if (tester.Size() >= 0x7fffL)	// Probably could be 0xffffL. 

+	{

+		regerror(REGERR_TO_BIG);

+		return NULL;

+	}

+

+	m_programSize = tester.Size();

+	// Allocate space. 

+	program = new char[m_programSize];

+

+	CRegCompiler comp( exp, program );

+	// Second pass: emit code. 

+	if (comp.reg(0, &flags) == NULL)

+		return false;

+

+	scan = program + 1;			// First BRANCH. 

+	if (OP(regnext(scan)) == END)

+	{		// Only one top-level choice. 

+		scan = OPERAND(scan);

+

+		// Starting-point info. 

+		if (OP(scan) == EXACTLY)

+			regstart = *OPERAND(scan);

+		else if (OP(scan) == BOL)

+			reganch = 1;

+

+		// If there's something expensive in the r.e., find the

+		// longest literal string that must appear and make it the

+		// regmust.  Resolve ties in favor of later strings, since

+		// the regstart check works with the beginning of the r.e.

+		// and avoiding duplication strengthens checking.  Not a

+		// strong reason, but sufficient in the absence of others.

+		 

+		if (flags&SPSTART) 

+		{

+			char * longest = NULL;

+			size_t len = 0;

+

+			for (; scan != NULL; scan = regnext(scan))

+				if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len)

+				{

+					longest = OPERAND(scan);

+					len = strlen(OPERAND(scan));

+				}

+			regmust = longest;

+			regmlen = (int)len;

+		}

+	}

+

+	return true;

+}

+

+regexp * regexp::getCopy()

+{

+	return new regexp( *this );

+}

+

+// reg - regular expression, i.e. main body or parenthesized thing

+//

+// Caller must absorb opening parenthesis.

+//

+// Combining parenthesis handling with the base level of regular expression

+// is a trifle forced, but the need to tie the tails of the branches to what

+// follows makes it hard to avoid.

+

+char * CRegCompilerBase::reg( int paren, int *flagp )

+{

+	char * ret = NULL;

+	char * br;

+	char * ender;

+	int parno = 0;

+	int flags;

+

+	*flagp = HASWIDTH;	// Tentatively. 

+

+	if (paren)

+	{

+		// Make an OPEN node. 

+		if (regnpar >= Regexp::NSUBEXP)

+		{

+			regerror(REGERR_TO_MANY_PAREN);

+			return NULL;

+		}

+		parno = regnpar;

+		regnpar++;

+		ret = regnode(OPEN+parno);

+	}

+

+	// Pick up the branches, linking them together. 

+	br = regbranch(&flags);

+	if (br == NULL)

+		return(NULL);

+	if (paren)

+		regtail(ret, br);	// OPEN -> first. 

+	else

+		ret = br;

+	*flagp &= ~(~flags&HASWIDTH);	// Clear bit if bit 0. 

+	*flagp |= flags&SPSTART;

+	while (*regparse == '|')

+	{

+		regparse++;

+		br = regbranch(&flags);

+		if (br == NULL)

+			return(NULL);

+		regtail(ret, br);	// BRANCH -> BRANCH. 

+		*flagp &= ~(~flags&HASWIDTH);

+		*flagp |= flags&SPSTART;

+	}

+

+	// Make a closing node, and hook it on the end. 

+	ender = regnode((paren) ? CLOSE+parno : END);

+	regtail(ret, ender);

+

+	// Hook the tails of the branches to the closing node. 

+	for (br = ret; br != NULL; br = regnext(br))

+		regoptail(br, ender);

+

+	// Check for proper termination. 

+	if (paren && *regparse++ != ')')

+	{

+		regerror( REGERR_UNTERMINATED_PAREN );

+		return NULL;

+	}

+	else if (!paren && *regparse != '\0')

+	{

+		if (*regparse == ')')

+		{

+			regerror( REGERR_UNMATCHED_PAREN );

+			return NULL;

+		}

+		else

+		{

+			regerror( REGERR_INTERNAL_ERROR_JUNK );

+			return NULL;

+		}

+		// NOTREACHED 

+	}

+

+	return(ret);

+}

+

+// regbranch - one alternative of an | operator

+//

+// Implements the concatenation operator.

+

+char * CRegCompilerBase::regbranch(int *flagp)

+{

+	char * ret;

+	char * chain;

+	char * latest;

+	int flags;

+	int c;

+

+	*flagp = WORST;				// Tentatively. 

+

+	ret = regnode(BRANCH);

+	chain = NULL;

+	while ((c = *regparse) != '\0' && c != '|' && c != ')')

+	{

+		latest = regpiece(&flags);

+		if (latest == NULL)

+			return(NULL);

+		*flagp |= flags&HASWIDTH;

+		if (chain == NULL)		// First piece. 

+			*flagp |= flags&SPSTART;

+		else

+			regtail(chain, latest);

+		chain = latest;

+	}

+	if (chain == NULL)			// Loop ran zero times. 

+		(void) regnode(NOTHING);

+

+	return(ret);

+}

+

+// regpiece - something followed by possible [*+?]

+//

+// Note that the branching code sequences used for ? and the general cases

+// of * and + are somewhat optimized:  they use the same NOTHING node as

+// both the endmarker for their branch list and the body of the last branch.

+// It might seem that this node could be dispensed with entirely, but the

+// endmarker role is not redundant.

+

+char * CRegCompilerBase::regpiece(int *flagp)

+{

+	char * ret;

+	char op;

+	char * next;

+	int flags;

+

+	ret = regatom(&flags);

+	if (ret == NULL)

+		return(NULL);

+

+	op = *regparse;

+	if (!ISREPN(op))

+	{

+		*flagp = flags;

+		return(ret);

+	}

+

+	if (!(flags&HASWIDTH) && op != '?' )

+	{

+		regerror( REGERR_OP_COULD_BE_EMPTY );

+		return NULL;

+	}

+	switch (op)

+	{

+		case '*' :	*flagp = WORST|SPSTART;				break;

+		case '+' :	*flagp = WORST|SPSTART|HASWIDTH;	break;

+		case '?' :	*flagp = WORST;						break;

+	}

+

+	if (op == '*'  && (flags&SIMPLE))

+		reginsert(STAR, ret);

+	else if (op == '*' )

+	{

+		// Emit x* as (x&|), where & means "self". 

+		reginsert(BRANCH, ret);				// Either x 

+		regoptail(ret, regnode(BACK));		// and loop 

+		regoptail(ret, ret);				// back 

+		regtail(ret, regnode(BRANCH));		// or 

+		regtail(ret, regnode(NOTHING));		// null. 

+	}

+	else if (op == '+'  && (flags&SIMPLE))

+		reginsert(PLUS, ret);

+	else if (op == '+' )

+	{

+		// Emit x+ as x(&|), where & means "self". 

+		next = regnode(BRANCH);				// Either 

+		regtail(ret, next);

+		regtail(regnode(BACK), ret);		// loop back 

+		regtail(next, regnode(BRANCH));		// or 

+		regtail(ret, regnode(NOTHING));		// null. 

+	}

+	else if (op == '?' )

+	{

+		// Emit x? as (x|) 

+		reginsert(BRANCH, ret);				// Either x 

+		regtail(ret, regnode(BRANCH));		// or 

+		next = regnode(NOTHING);			// null. 

+		regtail(ret, next);

+		regoptail(ret, next);

+	}

+	regparse++;

+	if (ISREPN(*regparse))

+	{

+		regerror( REGERR_NESTED_OP );

+		return NULL;

+	}

+

+	return(ret);

+}

+

+// regatom - the lowest level

+//

+// Optimization:  gobbles an entire sequence of ordinary characters so that

+// it can turn them into a single node, which is smaller to store and

+// faster to run.  Backslashed characters are exceptions, each becoming a

+// separate node; the code is simpler that way and it's not worth fixing.

+

+char * CRegCompilerBase::regatom(int * flagp)

+{

+	char * ret;

+	int flags;

+

+	*flagp = WORST;		// Tentatively. 

+

+	switch ( *regparse++ )

+	{

+		// FIXME: these chars only have meaning at beg/end of pat?

+		case '^':

+			ret = regnode(BOL);

+			break;

+		case '$':

+			ret = regnode(EOL);

+			break;

+		case '.':

+			ret = regnode(ANY);

+			*flagp |= HASWIDTH|SIMPLE;

+			break;

+		case '[':

+		{

+			int range;

+			int rangeend;

+			int c;

+

+			if (*regparse == '^')

+			{	// Complement of range. 

+				ret = regnode(ANYBUT);

+				regparse++;

+			}

+			else

+				ret = regnode(ANYOF);

+			if ((c = *regparse) == ']' || c == '-')

+			{

+				regc(c);

+				regparse++;

+			}

+			while ((c = *regparse++ ) != '\0' && c != ']')

+			{

+				if (c != '-')

+					regc(c);

+				else if ((c = *regparse) == ']' || c == '\0')

+					regc('-');

+				else

+				{

+					range = (char)*(regparse-2);

+					rangeend = (char)c;

+					if (range > rangeend)

+					{

+						regerror( REGERR_INVALID_RANGE );

+						return NULL;

+					}

+					for (range++; range <= rangeend; range++)

+						regc(range);

+					regparse++;

+				}

+			}

+			regc('\0');

+			if (c != ']')

+			{

+				regerror( REGERR_UNMATCHED_BRACE );

+				return NULL;

+			}

+			*flagp |= HASWIDTH|SIMPLE;

+			break;

+		}

+		case '(':

+			ret = reg(1, &flags);

+			if (ret == NULL)

+				return(NULL);

+			*flagp |= flags&(HASWIDTH|SPSTART);

+			break;

+		case '\0':

+		case '|':

+		case ')':

+			// supposed to be caught earlier 

+			regerror( REGERR_INTERNAL_UNEXPECTED_CHAR );

+			return NULL;

+		case '?':

+		case '+':

+		case '*':

+			{

+				regerror( REGERR_OP_FOLLOWS_NOTHING );

+				return NULL;

+			}

+		case '\\':

+			switch (*regparse++)

+			{

+				case '\0':

+				{

+					regerror( REGERR_TRAILING_ESC );

+					return NULL;

+				}

+				case '<':

+					ret = regnode(WORDA);

+					break;

+				case '>':

+					ret = regnode(WORDZ);

+					break;

+				/* FIXME: Someday handle \1, \2, ... */

+				default:

+					/* Handle general quoted chars in exact-match routine */

+					goto de_fault;

+			}

+			break;

+	de_fault:

+	default:

+		// Encode a string of characters to be matched exactly.

+		//

+		// This is a bit tricky due to quoted chars and due to

+		// '*', '+', and '?' taking the SINGLE char previous

+		// as their operand.

+		//

+		// On entry, the char at regparse[-1] is going to go

+		// into the string, no matter what it is.  (It could be

+		// following a \ if we are entered from the '\' case.)

+		// 

+		// Basic idea is to pick up a good char in  ch  and

+		// examine the next char.  If it's *+? then we twiddle.

+		// If it's \ then we frozzle.  If it's other magic char

+		// we push  ch  and terminate the string.  If none of the

+		// above, we push  ch  on the string and go around again.

+		//

+		//  regprev  is used to remember where "the current char"

+		// starts in the string, if due to a *+? we need to back

+		// up and put the current char in a separate, 1-char, string.

+		// When  regprev  is NULL,  ch  is the only char in the

+		// string; this is used in *+? handling, and in setting

+		// flags |= SIMPLE at the end.

+		{

+			char *regprev;

+			register char ch;

+

+			regparse--;			/* Look at cur char */

+			ret = regnode(EXACTLY);

+			for ( regprev = 0 ; ; ) {

+				ch = *regparse++;	/* Get current char */

+				switch (*regparse) {	/* look at next one */

+

+				default:

+					regc(ch);	/* Add cur to string */

+					break;

+

+				case '.': case '[': case '(':

+				case ')': case '|': case '\n':

+				case '$': case '^':

+				case '\0':

+				/* FIXME, $ and ^ should not always be magic */

+				magic:

+					regc(ch);	/* dump cur char */

+					goto done;	/* and we are done */

+

+				case '?': case '+': case '*':

+					if (!regprev) 	/* If just ch in str, */

+						goto magic;	/* use it */

+					/* End mult-char string one early */

+					regparse = regprev; /* Back up parse */

+					goto done;

+

+				case '\\':

+					regc(ch);	/* Cur char OK */

+					switch (regparse[1]){ /* Look after \ */

+					case '\0':

+					case '<':

+					case '>':

+					/* FIXME: Someday handle \1, \2, ... */

+						goto done; /* Not quoted */

+					default:

+						/* Backup point is \, scan							 * point is after it. */

+						regprev = regparse;

+						regparse++; 

+						continue;	/* NOT break; */

+					}

+				}

+				regprev = regparse;	/* Set backup point */

+			}

+		done:

+			regc('\0');

+			*flagp |= HASWIDTH;

+			if (!regprev)		/* One char? */

+				*flagp |= SIMPLE;

+		}

+		break;

+	}

+

+	return(ret);

+}

+

+////////////////////////////////////////////////////////////////////////////////

+// regexec and friends

+

+// Work-variable struct for regexec().

+

+class CRegExecutor : public CRegProgramAccessor

+{

+	friend bool regexp::regexec( const char * str );

+

+	char * reginput;		// String-input pointer. 

+	char * regbol;			// Beginning of input, for ^ check. 

+	char * * regstartp;		// Pointer to startp array. 

+	char * * regendp;		// Ditto for endp.

+

+	regexp * prog;

+public:

+	CRegExecutor( regexp * prog, char * string );

+protected:

+	bool regtry( char * string );

+	bool regmatch( char * prog );

+	size_t regrepeat( char * node );

+};

+

+CRegExecutor::CRegExecutor( regexp * p, char * string )

+	: regbol( string ),

+	regstartp( p->startp ),

+	regendp( p->endp ),

+	prog(p)

+{

+}

+

+#ifdef _RE_DEBUG

+int regnarrate = 0;

+#endif

+

+// regexec - match a regexp against a string

+

+bool regexp::regexec( const char * str )

+{

+	char * string = (char *)str;	// avert const poisoning 

+

+	// Be paranoid. 

+	if ( string == NULL )

+	{

+		regerror( REGERR_NULLARG );

+		return false;

+	}

+

+	// Check validity of program. 

+	if (*program != MAGIC)

+	{

+		regerror( REGERR_CORRUPTED );

+		return false;

+	}

+

+	// If there is a "must appear" string, look for it. 

+	if ( regmust != NULL && strstr( string, regmust ) == NULL )

+		return false;

+

+	CRegExecutor executor( this, string );

+

+	// Simplest case:  anchored match need be tried only once. 

+	if ( reganch )

+		return( executor.regtry( string ) );

+

+	// Messy cases:  unanchored match. 

+	if ( regstart != '\0' )

+	{

+		// We know what char it must start with. 

+		for ( char * s = string; s != NULL; s = strchr( s+1 , regstart ) )

+			if ( executor.regtry( s) )

+				return true;

+		return false;

+	}

+	else

+	{

+		// We don't -- general case. 

+		for ( char * s = string; ! executor.regtry( s ); s++ )

+			if (*s == '\0')

+				return false;

+	}

+	return true;

+}

+

+// regtry - try match at specific point

+bool CRegExecutor::regtry( char * string )

+{

+	int i;

+	char * * stp;

+	char * * enp;

+

+	reginput = string;

+

+	stp = prog->startp;

+	enp = prog->endp;

+	for (i = Regexp::NSUBEXP; i > 0; i--)

+	{

+		*stp++ = NULL;

+		*enp++ = NULL;

+	}

+	if ( regmatch( prog->program + 1 ) )

+	{

+		prog->startp[0] = string;

+		prog->endp[0] = reginput;

+		return true;

+	}

+	else

+		return false;

+}

+

+// regmatch - main matching routine

+//

+// Conceptually the strategy is simple:  check to see whether the current

+// node matches, call self recursively to see whether the rest matches,

+// and then act accordingly.  In practice we make some effort to avoid

+// recursion, in particular by going through "ordinary" nodes (that don't

+// need to know whether the rest of the match failed) by a loop instead of

+// by recursion.

+

+bool CRegExecutor::regmatch( char * prog )

+{

+	char * scan;	// Current node. 

+	char * next;		// Next node. 

+

+#ifdef _RE_DEBUG

+	if (prog != NULL && regnarrate)

+		fprintf(stderr, "%s(\n", regprop(prog));

+#endif

+	for (scan = prog; scan != NULL; scan = next)

+	{

+#ifdef _RE_DEBUG

+		if (regnarrate)

+			fprintf(stderr, "%s...\n", regprop(scan));

+#endif

+		next = regnext(scan);

+

+		switch (OP(scan))

+		{

+			case BOL:

+				if (reginput != regbol)

+					return false;

+				break;

+			case EOL:

+				if (*reginput != '\0')

+					return false;

+				break;

+			case WORDA:

+				/* Must be looking at a letter, digit, or _ */

+				if ((!isalnum(*reginput)) && *reginput != '_')

+					return(0);

+				/* Prev must be BOL or nonword */

+				if (reginput > regbol &&

+					(isalnum(reginput[-1]) || reginput[-1] == '_'))

+					return(0);

+				break;

+			case WORDZ:

+				/* Must be looking at non letter, digit, or _ */

+				if (isalnum(*reginput) || *reginput == '_')

+					return(0);

+				/* We don't care what the previous char was */

+				break;

+			case ANY:

+				if (*reginput == '\0')

+					return false;

+				reginput++;

+				break;

+			case EXACTLY:

+			{

+				size_t len;

+				char * const opnd = OPERAND(scan);

+

+				// Inline the first character, for speed. 

+				if (*opnd != *reginput)

+					return false;

+				len = strlen(opnd);

+				if (len > 1 && strncmp(opnd, reginput, len) != 0)

+					return false;

+				reginput += len;

+

+				break;

+			}

+			case ANYOF:

+				if (*reginput == '\0' ||

+						strchr(OPERAND(scan), *reginput) == NULL)

+					return false;

+				reginput++;

+				break;

+			case ANYBUT:

+				if (*reginput == '\0' ||

+						strchr(OPERAND(scan), *reginput) != NULL)

+					return false;

+				reginput++;

+				break;

+			case NOTHING:

+				break;

+			case BACK:

+				break;

+			case OPEN+1: case OPEN+2: case OPEN+3:

+			case OPEN+4: case OPEN+5: case OPEN+6:

+			case OPEN+7: case OPEN+8: case OPEN+9:

+			case OPEN+10: case OPEN+11: case OPEN+12:

+			case OPEN+13: case OPEN+14: case OPEN+15:

+			case OPEN+16: case OPEN+17: case OPEN+18:

+			case OPEN+19:

+			{

+				const int no = OP(scan) - OPEN;

+				char * const input = reginput;

+

+				if (regmatch(next))

+				{

+					// Don't set startp if some later

+					// invocation of the same parentheses

+					// already has.

+					 

+					if (regstartp[no] == NULL)

+						regstartp[no] = input;

+					return true;

+				}

+				else

+					return false;

+				break;

+			}

+			case CLOSE+1: case CLOSE+2: case CLOSE+3:

+			case CLOSE+4: case CLOSE+5: case CLOSE+6:

+			case CLOSE+7: case CLOSE+8: case CLOSE+9:

+			case CLOSE+10: case CLOSE+11: case CLOSE+12:

+			case CLOSE+13: case CLOSE+14: case CLOSE+15:

+			case CLOSE+16: case CLOSE+17: case CLOSE+18:

+			case CLOSE+19:

+			{

+				const int no = OP(scan) - CLOSE;

+				char * const input = reginput;

+

+				if (regmatch(next))

+				{

+					// Don't set endp if some later

+					// invocation of the same parentheses

+					// already has.

+					 

+					if (regendp[no] == NULL)

+						regendp[no] = input;

+					return true;

+				}

+				else

+					return false;

+				break;

+			}

+			case BRANCH:

+			{

+				char * const save = reginput;

+

+				if (OP(next) != BRANCH)		// No choice. 

+					next = OPERAND(scan);	// Avoid recursion. 

+				else

+				{

+					while (OP(scan) == BRANCH)

+					{

+						if (regmatch(OPERAND(scan)))

+							return true;

+						reginput = save;

+						scan = regnext(scan);

+					}

+					return false;

+					// NOTREACHED 

+				}

+				break;

+			}

+			case STAR: case PLUS:

+			{

+				const char nextch = (OP(next) == EXACTLY) ? *OPERAND(next) : '\0';

+				size_t no;

+				char * const save = reginput;

+				const size_t min = (OP(scan) == STAR) ? 0 : 1;

+

+				for (no = regrepeat(OPERAND(scan)) + 1; no > min; no--)

+				{

+					reginput = save + no - 1;

+					// If it could work, try it. 

+					if (nextch == '\0' || *reginput == nextch)

+						if (regmatch(next))

+							return true;

+				}

+				return false;

+				break;

+			}

+			case END:

+				return true;	// Success! 

+				break;

+			default:

+				regerror( REGERR_CORRUPTION );

+				return false;

+				break;

+		}

+	}

+

+	// We get here only if there's trouble -- normally "case END" is

+	// the terminating point.

+

+	regerror( REGERR_CORRUPTED_POINTERS );

+	return false;

+}

+

+// regrepeat - report how many times something simple would match

+

+size_t CRegExecutor::regrepeat( char * node )

+{

+	size_t count;

+	char * scan;

+	char ch;

+

+	switch (OP(node))

+	{

+		case ANY:

+			return(strlen(reginput));

+			break;

+		case EXACTLY:

+			ch = *OPERAND(node);

+			count = 0;

+			for (scan = reginput; *scan == ch; scan++)

+				count++;

+			return(count);

+			break;

+		case ANYOF:

+			return(strspn(reginput, OPERAND(node)));

+			break;

+		case ANYBUT:

+			return(strcspn(reginput, OPERAND(node)));

+			break;

+		default:		// Oh dear.  Called inappropriately. 

+			regerror( REGERR_BAD_REGREPEAT );

+			return(0);	// Best compromise. 

+			break;

+	}

+	// NOTREACHED 

+}

+

+#ifdef _RE_DEBUG

+

+// regdump - dump a regexp onto stdout in vaguely comprehensible form

+

+void regexp::regdump()

+{

+	char * s;

+	char op = EXACTLY;	// Arbitrary non-END op. 

+	char * next;

+

+	s = program + 1;

+	while (op != END)

+	{	// While that wasn't END last time... 

+		op = OP(s);

+		printf("%2d%s", s-program, regprop(s));	// Where, what. 

+		next = regnext(s);

+		if (next == NULL)		// Next ptr. 

+			printf("(0)" );

+		else 

+			printf("(%d)", (s-program)+(next-s));

+		s += 3;

+		if (op == ANYOF || op == ANYBUT || op == EXACTLY)

+		{

+			// Literal string, where present. 

+			while (*s != '\0')

+			{

+				putchar(*s);

+				s++;

+			}

+			s++;

+		}

+		putchar('\n');

+	}

+

+	// Header fields of interest. 

+	if (regstart != '\0')

+		printf("start `%c' ", regstart);

+	if (reganch)

+		printf("anchored ");

+	if (regmust != NULL)

+		printf("must have \"%s\"" , regmust);

+	printf("\n");

+}

+

+// regprop - printable representation of opcode

+

+#define OUTPUT(s) case s: p = #s; break

+char * CRegProgramAccessor::regprop( char * op )

+{

+	char * p = NULL;

+	static char buf[50];

+

+	(void) strcpy(buf, ":" );

+

+	switch (OP(op))

+	{

+	OUTPUT( BOL );

+	OUTPUT( EOL );

+	OUTPUT( ANY );

+	OUTPUT( ANYOF );

+	OUTPUT( ANYBUT );

+	OUTPUT( BRANCH );

+	OUTPUT( EXACTLY );

+	OUTPUT( NOTHING );

+	OUTPUT( BACK );

+	OUTPUT( END );

+	OUTPUT( STAR );

+	OUTPUT( PLUS );

+	OUTPUT( WORDA );

+	OUTPUT( WORDZ );

+	case OPEN+1: case OPEN+2: case OPEN+3:

+	case OPEN+4: case OPEN+5: case OPEN+6:

+	case OPEN+7: case OPEN+8: case OPEN+9:

+	case OPEN+10: case OPEN+11: case OPEN+12:

+	case OPEN+13: case OPEN+14: case OPEN+15:

+	case OPEN+16: case OPEN+17: case OPEN+18:

+	case OPEN+19:

+		sprintf(buf+strlen(buf), "OPEN%d", OP(op)-OPEN);

+		p = NULL;

+		break;

+	case CLOSE+1: case CLOSE+2: case CLOSE+3:

+	case CLOSE+4: case CLOSE+5: case CLOSE+6:

+	case CLOSE+7: case CLOSE+8: case CLOSE+9:

+	case CLOSE+10: case CLOSE+11: case CLOSE+12:

+	case CLOSE+13: case CLOSE+14: case CLOSE+15:

+	case CLOSE+16: case CLOSE+17: case CLOSE+18:

+	case CLOSE+19:

+		sprintf(buf+strlen(buf), "CLOSE%d", OP(op)-CLOSE);

+		p = NULL;

+		break;

+	default:

+		regerror( REGERR_CORRUPTED_OPCODE );

+		break;

+	}

+	if (p != NULL)

+		(void) strcat(buf, p);

+	return(buf);

+}

+#endif

+

+///////////////////////////////////////////////////////////////////////////////

+

+Regexp::Regexp()

+	: rc(0),

+	str(0)

+{

+}

+

+Regexp::Regexp( const char * exp, bool iCase )

+	: rc( new regexp( exp, iCase ) ),

+	str( 0 )

+{

+}

+

+Regexp::Regexp( const Regexp &r )

+	: rc( r.rc ),

+	m_szError(r.m_szError),

+	str(r.str)

+{

+	if ( rc )

+		rc->count++;

+}

+

+const Regexp & Regexp::operator=( const Regexp & r )

+{

+	if ( this != &r )

+	{

+		if ( rc && rc->count-- == 0 )

+			delete rc;

+

+		rc = r.rc;

+		if ( rc )

+			rc->count++;

+

+		str = r.str;

+		m_szError = r.m_szError;

+	}	

+	return *this;

+}

+

+Regexp::~Regexp()

+{

+	if ( rc && rc->count-- == 0 )

+		delete rc;

+}

+

+bool Regexp::Match( const char * s )

+{

+	ClearErrorString();

+	str = s;

+	bool ret = false;

+	if ( rc )

+	{

+		// copy on write !

+

+		if ( rc->count )

+		{

+			rc->count--;

+			rc = rc->getCopy();

+		}

+

+		ret = rc->regexec( s );

+		int i = 0;

+		if ( ret )

+			for ( i = 0; i < Regexp::NSUBEXP && rc->startp[i] ; i++ )

+				;

+		rc->numSubs = i - 1;

+	}

+	else

+		m_szError = CRegErrorHandler::FindErr( REGERR_NO_REGEXP );

+	return ret;

+}

+

+string Regexp::GetReplaceString( const char * source ) const

+{

+	ClearErrorString();

+	if ( rc )

+		return rc->GetReplaceString( source );

+	else

+		m_szError = CRegErrorHandler::FindErr( REGERR_NO_REGEXP );

+	return "";

+}

+

+int Regexp::SubStrings() const

+{

+	ClearErrorString();

+	int ret = -1;

+	if ( rc )

+		ret = rc->numSubs;

+	else

+		m_szError = CRegErrorHandler::FindErr( REGERR_NO_REGEXP );

+	return ret;

+}

+

+int Regexp::SubStart( unsigned int i ) const

+{

+	ClearErrorString();

+	int ret = -1;

+	if ( rc )

+		ret = rc->startp[safeIndex(i)] - str;

+	else

+		m_szError = CRegErrorHandler::FindErr( REGERR_NO_REGEXP );

+	return ret;

+}

+

+int Regexp::SubLength( unsigned int i ) const

+{

+	ClearErrorString();

+	int ret = -1;

+	if ( rc )

+	{

+		i = safeIndex(i);

+		ret = rc->endp[i] - rc->startp[i];

+	}

+	else

+		m_szError = CRegErrorHandler::FindErr( REGERR_NO_REGEXP );

+	return ret;

+}

+

+bool Regexp::CompiledOK() const

+{

+	return rc ? rc->Status() : false;

+}

+

+#ifdef _RE_DEBUG

+void Regexp::Dump()

+{

+	if ( rc )

+		rc->regdump();

+#if defined( _DEBUG )

+	else

+		TRACE( "No regexp to dump out\n" );

+#endif

+}

+#endif

+

+int Regexp::safeIndex( unsigned int i ) const

+{

+	return i < Regexp::NSUBEXP ? i : Regexp::NSUBEXP;

+}

+

+const string Regexp::operator[]( unsigned int i ) const

+{

+	string value;

+	ClearErrorString();

+	assert( rc );

+	if ( rc )

+	{

+		int len = SubLength(i);

+		//char * szbuf = buffer.GetBufferSetLength( len );

+		//memcpy( szbuf, rc->startp[i], len * sizeof(char) );

+		//buffer.ReleaseBuffer();

+		value =  std::string ( rc->startp[i], len );

+	}

+	else

+	{

+		m_szError = CRegErrorHandler::FindErr( REGERR_NO_REGEXP );

+	}

+	return value;

+}

+

+void regexp::ignoreCase( const char * in, char * out )

+{

+	// copy in to out making every top level character a [Aa] set

+	bool inRange = false;

+	while( *in )

+	{

+		if ( *in == '[' )

+			inRange = true;

+		if ( *in == ']' )

+			inRange = false;

+		if ( ! inRange && isalpha( *in ) )

+		{

+			*out++ = '[';

+			*out++ = (char)toupper( *in );

+			*out++ = (char)tolower( *in );

+			*out++ = ']';

+		}

+		else

+			*out++ = *in;

+		in++;

+	}

+	*out = 0;

+}

+

+// GetReplaceString	- Converts a replace expression to a string

+//					- perform substitutions after a regexp match

+// Returns			- The resultant string

+string regexp::GetReplaceString( const char* sReplaceExp ) const

+{

+	string szEmpty( "" );

+

+	char *src = (char *)sReplaceExp;

+	//char *buf;

+	char c;

+	int no;

+	size_t len;

+

+	if( sReplaceExp == NULL )

+	{

+		regerror( REGERR_NULL_TO_REGSUB  );

+		return szEmpty;

+	}

+	if ( *program != MAGIC)

+	{

+		regerror( REGERR_DAMAGED_REGEXP_REGSUB );

+		return szEmpty;

+	}

+

+	// First compute the length of the string

+	int replacelen = 0;

+	while ((c = *src++) != '\0') 

+	{

+		if (c == '&')

+			no = 0;

+		else if (c == '\\' && isdigit(*src))

+			no = *src++ - '0';

+		else

+			no = -1;

+

+		if (no < 0) 

+		{	

+			// Ordinary character. 

+			if (c == '\\' && (*src == '\\' || *src == '&'))

+				c = *src++;

+			replacelen++;

+		} 

+		else if (startp[no] != NULL && endp[no] != NULL &&

+					endp[no] > startp[no]) 

+		{

+			// Get tagged expression

+			len = endp[no] - startp[no];

+			replacelen += len;

+		}

+	}

+

+	string szReplace;

+

+	//buf = szReplace.GetBufferSetLength( replacelen );

+

+	// Now we can create the string

+	src = (char *)sReplaceExp;

+	while ((c = *src++) != '\0') 

+	{

+		if (c == '&')

+			no = 0;

+		else if (c == '\\' && isdigit(*src))

+			no = *src++ - '0';

+		else

+			no = -1;

+

+		if (no < 0) 

+		{	

+			// Ordinary character. 

+			if (c == '\\' && (*src == '\\' || *src == '&'))

+				c = *src++;

+			//*buf++ = c;

+			szReplace += c ;

+		} 

+		else if (startp[no] != NULL && endp[no] != NULL &&

+					endp[no] > startp[no]) 

+		{

+			// Get tagged expression

+			len = endp[no] - startp[no];

+			//strncpy(buf, startp[no], len);

+			//buf += len;

+			szReplace.append( startp[no], len );

+//			if (len != 0 && *(buf-1) == '\0' ))

+//			{	/* strncpy hit NUL. */

+//				regerror( REGERR_DAMAGED_MATCH_STRING );

+//				return szEmpty;

+//			}

+		}

+	}

+

+	//szReplace.ReleaseBuffer( replacelen );

+	return szReplace;

+}

+

+string Regexp::GetErrorString() const

+{

+	// make sure that if status == 0 that we have an error string

+	assert( ( ! CompiledOK() ) ? ( rc ? rc->GetErrorString() : m_szError).length() != 0 : 1 );

+	return rc ? rc->GetErrorString() : m_szError ;

+}

+

+void Regexp::ClearErrorString() const

+{

+	if ( rc )

+		rc->ClearErrorString();

+	m_szError.erase();

+}

+