gfx/thebes/gfxScriptItemizer.h

   1 /* -*- Mode: C++; tab-width: 20; 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 /*
   7  * This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted
   8  * for use within Mozilla Gecko, separate from a standard ICU build.
   9  *
  10  * The original ICU license of the code follows:
  11  *
  12  * ICU License - ICU 1.8.1 and later
  13  *
  14  * COPYRIGHT AND PERMISSION NOTICE
  15  *
  16  * Copyright (c) 1995-2009 International Business Machines Corporation and
  17  * others
  18  *
  19  * All rights reserved.
  20  *
  21  * Permission is hereby granted, free of charge, to any person obtaining a
  22  * copy of this software and associated documentation files (the "Software"),
  23  * to deal in the Software without restriction, including without limitation
  24  * the rights to use, copy, modify, merge, publish, distribute, and/or sell
  25  * copies of the Software, and to permit persons to whom the Software is
  26  * furnished to do so, provided that the above copyright notice(s) and this
  27  * permission notice appear in all copies of the Software and that both the
  28  * above copyright notice(s) and this permission notice appear in supporting
  29  * documentation.
  30  *
  31  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  32  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  33  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  34  * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
  35  * BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
  36  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  37  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  38  * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  39  * SOFTWARE.
  40  *
  41  * Except as contained in this notice, the name of a copyright holder shall
  42  * not be used in advertising or otherwise to promote the sale, use or other
  43  * dealings in this Software without prior written authorization of the
  44  * copyright holder.
  45  *
  46  * All trademarks and registered trademarks mentioned herein are the property
  47  * of their respective owners.
  48  */
  49
  50 #ifndef GFX_SCRIPTITEMIZER_H
  51 #define GFX_SCRIPTITEMIZER_H
  52
  53 #include <stdint.h>
  54 #include "mozilla/intl/UnicodeScriptCodes.h"
  55
  56 #define PAREN_STACK_DEPTH 32
  57
  58 class gfxScriptItemizer {
  59  public:
  60   typedef mozilla::intl::Script Script;
  61
  62   gfxScriptItemizer(const char16_t* src, uint32_t length);
  63
  64   void SetText(const char16_t* src, uint32_t length);
  65
  66   bool Next(uint32_t& aRunStart, uint32_t& aRunLimit, Script& aRunScript);
  67
  68  protected:
  69   void reset() {
  70     scriptStart = 0;
  71     scriptLimit = 0;
  72     scriptCode = Script::INVALID;
  73     parenSP = -1;
  74     pushCount = 0;
  75     fixupCount = 0;
  76   }
  77
  78   void push(uint32_t endPairChar, Script newScriptCode);
  79   void pop();
  80   void fixup(Script newScriptCode);
  81
  82   struct ParenStackEntry {
  83     uint32_t endPairChar;
  84     Script scriptCode;
  85   };
  86
  87   const char16_t* textPtr;
  88   uint32_t textLength;
  89
  90   uint32_t scriptStart;
  91   uint32_t scriptLimit;
  92   Script scriptCode;
  93
  94   struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
  95   uint32_t parenSP;
  96   uint32_t pushCount;
  97   uint32_t fixupCount;
  98 };
  99
 100 #endif /* GFX_SCRIPTITEMIZER_H */