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 namespace Scintilla::Internal {
  13
  14 class CharacterIndexer {
  15 public:
  16         virtual char CharAt(Sci::Position index) const=0;
  17 };
  18
  19 class RESearch {
  20
  21 public:
  22         explicit RESearch(CharClassify *charClassTable);
  23         // No dynamic allocation so default copy constructor and assignment operator are OK.
  24         void Clear() noexcept;
  25         void GrabMatches(const CharacterIndexer &ci);
  26         const char *Compile(const char *pattern, Sci::Position length, bool caseSensitive, bool posix) noexcept;
  27         int Execute(const CharacterIndexer &ci, Sci::Position lp, Sci::Position endp);
  28
  29         static constexpr int MAXTAG = 10;
  30         static constexpr int NOTFOUND = -1;
  31
  32         Sci::Position bopat[MAXTAG];
  33         Sci::Position eopat[MAXTAG];
  34         std::string pat[MAXTAG];
  35
  36 private:
  37
  38         static constexpr int MAXNFA = 4096;
  39         // The following constants are not meant to be changeable.
  40         // They are for readability only.
  41         static constexpr int MAXCHR = 256;
  42         static constexpr int CHRBIT = 8;
  43         static constexpr int BITBLK = MAXCHR / CHRBIT;
  44
  45         void ChSet(unsigned char c) noexcept;
  46         void ChSetWithCase(unsigned char c, bool caseSensitive) noexcept;
  47         int GetBackslashExpression(const char *pattern, int &incr) noexcept;
  48
  49         Sci::Position PMatch(const CharacterIndexer &ci, Sci::Position lp, Sci::Position endp, char *ap);
  50
  51         Sci::Position bol;
  52         Sci::Position tagstk[MAXTAG];  /* subpat tag stack */
  53         char nfa[MAXNFA];    /* automaton */
  54         int sta;
  55         unsigned char bittab[BITBLK]; /* bit table for CCL pre-set bits */
  56         int failure;
  57         CharClassify *charClass;
  58         bool iswordc(unsigned char x) const noexcept {
  59                 return charClass->IsWord(x);
  60         }
  61 };
  62
  63 }
  64
  65 #endif
  66