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Diffstat (limited to 'Ivy/Regexp.cxx')
| -rw-r--r-- | Ivy/Regexp.cxx | 1757 |
1 files changed, 1757 insertions, 0 deletions
diff --git a/Ivy/Regexp.cxx b/Ivy/Regexp.cxx new file mode 100644 index 0000000..6d44def --- /dev/null +++ b/Ivy/Regexp.cxx @@ -0,0 +1,1757 @@ +// 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();
+}
+
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