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 // Shut up annoying Visual C++ warnings:
  18 #ifdef _MSC_VER
  19 #pragma warning(disable: 4514)
  20 #endif
  21
  22 CharClassify::CharClassify() {
  23         SetDefaultCharClasses(true);
  24 }
  25
  26 void CharClassify::SetDefaultCharClasses(bool includeWordClass) {
  27         // Initialize all char classes to default values
  28         for (int ch = 0; ch < 256; ch++) {
  29                 if (ch == '\r' || ch == '\n')
  30                         charClass[ch] = ccNewLine;
  31                 else if (ch < 0x20 || ch == ' ')
  32                         charClass[ch] = ccSpace;
  33                 else if (includeWordClass && (ch >= 0x80 || isalnum(ch) || ch == '_'))
  34                         charClass[ch] = ccWord;
  35                 else
  36                         charClass[ch] = ccPunctuation;
  37         }
  38 }
  39
  40 void CharClassify::SetCharClasses(const unsigned char *chars, cc newCharClass) {
  41         // Apply the newCharClass to the specifed chars
  42         if (chars) {
  43                 while (*chars) {
  44                         charClass[*chars] = static_cast<unsigned char>(newCharClass);
  45                         chars++;
  46                 }
  47         }
  48 }
  49
  50 int CharClassify::GetCharsOfClass(cc characterClass, unsigned char *buffer) {
  51         // Get characters belonging to the given char class; return the number
  52         // of characters (if the buffer is NULL, don't write to it).
  53         int count = 0;
  54         for (int ch = maxChar - 1; ch >= 0; --ch) {
  55                 if (charClass[ch] == characterClass) {
  56                         ++count;
  57                         if (buffer) {
  58                                 *buffer = static_cast<unsigned char>(ch);
  59                                 buffer++;
  60                         }
  61                 }
  62         }
  63         return count;
  64 }