ext/scintilla/src/CharClassify.cxx

   1 // Scintilla source code edit control
   2 /** @file CharClassify.cxx
   3  ** Character classifications used by Document and RESearch.
   4  **/
   5 // Copyright 2006 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <cstdlib>
   9 #include <cassert>
  10
  11 #include <stdexcept>
  12
  13 #include "CharacterType.h"
  14 #include "CharClassify.h"
  15
  16 using namespace Scintilla::Internal;
  17
  18 CharClassify::CharClassify() : charClass{} {
  19         SetDefaultCharClasses(true);
  20 }
  21
  22 void CharClassify::SetDefaultCharClasses(bool includeWordClass) {
  23         // Initialize all char classes to default values
  24         for (int ch = 0; ch < maxChar; ch++) {
  25                 if (ch == '\r' || ch == '\n')
  26                         charClass[ch] = CharacterClass::newLine;
  27                 else if (IsControl(ch) || ch == ' ')
  28                         charClass[ch] = CharacterClass::space;
  29                 else if (includeWordClass && (ch >= 0x80 || IsAlphaNumeric(ch) || ch == '_'))
  30                         charClass[ch] = CharacterClass::word;
  31                 else
  32                         charClass[ch] = CharacterClass::punctuation;
  33         }
  34 }
  35
  36 void CharClassify::SetCharClasses(const unsigned char *chars, CharacterClass newCharClass) {
  37         // Apply the newCharClass to the specified chars
  38         if (chars) {
  39                 while (*chars) {
  40                         charClass[*chars] = newCharClass;
  41                         chars++;
  42                 }
  43         }
  44 }
  45
  46 int CharClassify::GetCharsOfClass(CharacterClass characterClass, unsigned char *buffer) const noexcept {
  47         // Get characters belonging to the given char class; return the number
  48         // of characters (if the buffer is NULL, don't write to it).
  49         int count = 0;
  50         for (int ch = maxChar - 1; ch >= 0; --ch) {
  51                 if (charClass[ch] == characterClass) {
  52                         ++count;
  53                         if (buffer) {
  54                                 *buffer = static_cast<unsigned char>(ch);
  55                                 buffer++;
  56                         }
  57                 }
  58         }
  59         return count;
  60 }