scintilla/src/RESearch.h

   1 // Scintilla source code edit control
   2 /** @file RESearch.h
   3  ** Interface to the regular expression search library.
   4  **/
   5 // Written by Neil Hodgson <neilh@scintilla.org>
   6 // Based on the work of Ozan S. Yigit.
   7 // This file is in the public domain.
   8
   9 #ifndef RESEARCH_H
  10 #define RESEARCH_H
  11
  12 #ifdef SCI_NAMESPACE
  13 namespace Scintilla {
  14 #endif
  15
  16 /*
  17  * The following defines are not meant to be changeable.
  18  * They are for readability only.
  19  */
  20 #define MAXCHR  256
  21 #define CHRBIT  8
  22 #define BITBLK  MAXCHR/CHRBIT
  23
  24 class CharacterIndexer {
  25 public:
  26         virtual char CharAt(int index)=0;
  27         virtual ~CharacterIndexer() {
  28         }
  29 };
  30
  31 class RESearch {
  32
  33 public:
  34         explicit RESearch(CharClassify *charClassTable);
  35         ~RESearch();
  36         void Clear();
  37         void GrabMatches(CharacterIndexer &ci);
  38         const char *Compile(const char *pattern, int length, bool caseSensitive, bool posix);
  39         int Execute(CharacterIndexer &ci, int lp, int endp);
  40
  41         enum { MAXTAG=10 };
  42         enum { MAXNFA=2048 };
  43         enum { NOTFOUND=-1 };
  44
  45         int bopat[MAXTAG];
  46         int eopat[MAXTAG];
  47         std::string pat[MAXTAG];
  48
  49 private:
  50         void ChSet(unsigned char c);
  51         void ChSetWithCase(unsigned char c, bool caseSensitive);
  52         int GetBackslashExpression(const char *pattern, int &incr);
  53
  54         int PMatch(CharacterIndexer &ci, int lp, int endp, char *ap);
  55
  56         int bol;
  57         int tagstk[MAXTAG];  /* subpat tag stack */
  58         char nfa[MAXNFA];    /* automaton */
  59         int sta;
  60         unsigned char bittab[BITBLK]; /* bit table for CCL pre-set bits */
  61         int failure;
  62         CharClassify *charClass;
  63         bool iswordc(unsigned char x) const {
  64                 return charClass->IsWord(x);
  65         }
  66 };
  67
  68 #ifdef SCI_NAMESPACE
  69 }
  70 #endif
  71
  72 #endif
  73