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 <stdlib.h>
   9 #include <ctype.h>
  10
  11 #include <stdexcept>
  12
  13 #include "CharClassify.h"
  14
  15 #ifdef SCI_NAMESPACE
  16 using namespace Scintilla;
  17 #endif
  18
  19 CharClassify::CharClassify() {
  20         SetDefaultCharClasses(true);
  21 }
  22
  23 void CharClassify::SetDefaultCharClasses(bool includeWordClass) {
  24         // Initialize all char classes to default values
  25         for (int ch = 0; ch < 256; ch++) {
  26                 if (ch == '\r' || ch == '\n')
  27                         charClass[ch] = ccNewLine;
  28                 else if (ch < 0x20 || ch == ' ')
  29                         charClass[ch] = ccSpace;
  30                 else if (includeWordClass && (ch >= 0x80 || isalnum(ch) || ch == '_'))
  31                         charClass[ch] = ccWord;
  32                 else
  33                         charClass[ch] = ccPunctuation;
  34         }
  35 }
  36
  37 void CharClassify::SetCharClasses(const unsigned char *chars, cc newCharClass) {
  38         // Apply the newCharClass to the specifed chars
  39         if (chars) {
  40                 while (*chars) {
  41                         charClass[*chars] = static_cast<unsigned char>(newCharClass);
  42                         chars++;
  43                 }
  44         }
  45 }
  46
  47 int CharClassify::GetCharsOfClass(cc characterClass, unsigned char *buffer) {
  48         // Get characters belonging to the given char class; return the number
  49         // of characters (if the buffer is NULL, don't write to it).
  50         int count = 0;
  51         for (int ch = maxChar - 1; ch >= 0; --ch) {
  52                 if (charClass[ch] == characterClass) {
  53                         ++count;
  54                         if (buffer) {
  55                                 *buffer = static_cast<unsigned char>(ch);
  56                                 buffer++;
  57                         }
  58                 }
  59         }
  60         return count;
  61 }