scintilla/lexlib/CharacterCategory.h

   1 // Scintilla source code edit control
   2 /** @file CharacterCategory.h
   3  ** Returns the Unicode general category of a character.
   4  **/
   5 // Copyright 2013 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #ifndef CHARACTERCATEGORY_H
   9 #define CHARACTERCATEGORY_H
  10
  11 namespace Scintilla {
  12
  13 enum CharacterCategory {
  14         ccLu, ccLl, ccLt, ccLm, ccLo,
  15         ccMn, ccMc, ccMe,
  16         ccNd, ccNl, ccNo,
  17         ccPc, ccPd, ccPs, ccPe, ccPi, ccPf, ccPo,
  18         ccSm, ccSc, ccSk, ccSo,
  19         ccZs, ccZl, ccZp,
  20         ccCc, ccCf, ccCs, ccCo, ccCn
  21 };
  22
  23 CharacterCategory CategoriseCharacter(int character);
  24
  25 // Common definitions of allowable characters in identifiers from UAX #31.
  26 bool IsIdStart(int character);
  27 bool IsIdContinue(int character);
  28 bool IsXidStart(int character);
  29 bool IsXidContinue(int character);
  30
  31 class CharacterCategoryMap {
  32 private:
  33         std::vector<unsigned char> dense;
  34 public:
  35         CharacterCategoryMap() noexcept;
  36         CharacterCategory CategoryFor(int character) const {
  37                 if (static_cast<size_t>(character) < dense.size()) {
  38                         return static_cast<CharacterCategory>(dense[character]);
  39                 } else {
  40                         // binary search through ranges
  41                         return CategoriseCharacter(character);
  42                 }
  43         }
  44         int Size() const noexcept;
  45         void Optimize(int countCharacters);
  46 };
  47
  48 }
  49
  50 #endif