ext/scintilla/src/CaseFolder.cxx

   1 // Scintilla source code edit control
   2 /** @file CaseFolder.cxx
   3  ** Classes for case folding.
   4  **/
   5 // Copyright 1998-2013 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <stdexcept>
   9 #include <vector>
  10 #include <algorithm>
  11
  12 #include "CharacterType.h"
  13 #include "CaseFolder.h"
  14 #include "CaseConvert.h"
  15
  16 using namespace Scintilla::Internal;
  17
  18 namespace {
  19
  20 constexpr unsigned char IndexFromChar(char ch) {
  21         return static_cast<unsigned char>(ch);
  22 }
  23
  24 }
  25
  26 CaseFolderTable::CaseFolderTable() noexcept : mapping{}  {
  27         StandardASCII();
  28 }
  29
  30 size_t CaseFolderTable::Fold(char *folded, size_t sizeFolded, const char *mixed, size_t lenMixed) {
  31         if (lenMixed > sizeFolded) {
  32                 return 0;
  33         }
  34         for (size_t i=0; i<lenMixed; i++) {
  35                 folded[i] = mapping[IndexFromChar(mixed[i])];
  36         }
  37         return lenMixed;
  38 }
  39
  40 void CaseFolderTable::SetTranslation(char ch, char chTranslation) noexcept {
  41         mapping[IndexFromChar(ch)] = chTranslation;
  42 }
  43
  44 void CaseFolderTable::StandardASCII() noexcept {
  45         for (size_t iChar=0; iChar<std::size(mapping); iChar++) {
  46                 mapping[iChar] = static_cast<char>(MakeLowerCase(iChar));
  47         }
  48 }
  49
  50 CaseFolderUnicode::CaseFolderUnicode() {
  51         converter = ConverterFor(CaseConversion::fold);
  52 }
  53
  54 size_t CaseFolderUnicode::Fold(char *folded, size_t sizeFolded, const char *mixed, size_t lenMixed) {
  55         if ((lenMixed == 1) && (sizeFolded > 0)) {
  56                 folded[0] = mapping[IndexFromChar(mixed[0])];
  57                 return 1;
  58         } else {
  59                 return converter->CaseConvertString(folded, sizeFolded, mixed, lenMixed);
  60         }
  61 }