intl/unicharutil/util/GreekCasing.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef GreekCasing_h_
   7 #define GreekCasing_h_
   8
   9 #include <stdint.h>
  10 #include "mozilla/Attributes.h"
  11
  12 namespace mozilla {
  13
  14 class GreekCasing {
  15   // When doing an Uppercase transform in Greek, we need to keep track of the
  16   // current state while iterating through the string, to recognize and process
  17   // diphthongs correctly. For clarity, we define a state for each vowel and
  18   // each vowel with accent, although a few of these do not actually need any
  19   // special treatment and could be folded into kStart.
  20 private:
  21   enum GreekStates {
  22     kStart,
  23     kAlpha,
  24     kEpsilon,
  25     kEta,
  26     kIota,
  27     kOmicron,
  28     kUpsilon,
  29     kOmega,
  30     kAlphaAcc,
  31     kEpsilonAcc,
  32     kEtaAcc,
  33     kIotaAcc,
  34     kOmicronAcc,
  35     kUpsilonAcc,
  36     kOmegaAcc,
  37     kOmicronUpsilon,
  38     kDiaeresis
  39   };
  40
  41 public:
  42   class State {
  43   public:
  44     State()
  45       : mState(kStart)
  46     {
  47     }
  48
  49     MOZ_IMPLICIT State(const GreekStates& aState)
  50       : mState(aState)
  51     {
  52     }
  53
  54     void Reset()
  55     {
  56       mState = kStart;
  57     }
  58
  59     operator GreekStates() const
  60     {
  61       return mState;
  62     }
  63
  64   private:
  65     GreekStates mState;
  66   };
  67
  68   static uint32_t UpperCase(uint32_t aCh, State& aState);
  69 };
  70
  71 } // namespace mozilla
  72
  73 #endif