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