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       1             : /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       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 "nsUnicodeScriptCodes.h"
      55             : 
      56             : #define PAREN_STACK_DEPTH 32
      57             : 
      58             : class gfxScriptItemizer
      59             : {
      60             : public:
      61             :     typedef mozilla::unicode::Script Script;
      62             : 
      63             :     gfxScriptItemizer(const char16_t *src, uint32_t length);
      64             : 
      65             :     void SetText(const char16_t *src, uint32_t length);
      66             : 
      67             :     bool Next(uint32_t& aRunStart, uint32_t& aRunLimit,
      68             :               Script& aRunScript);
      69             : 
      70             : protected:
      71          62 :     void reset() {
      72          62 :         scriptStart = 0;
      73          62 :         scriptLimit = 0;
      74          62 :         scriptCode  = Script::INVALID;
      75          62 :         parenSP     = -1;
      76          62 :         pushCount   =  0;
      77          62 :         fixupCount  =  0;
      78          62 :     }
      79             : 
      80             :     void push(uint32_t endPairChar, Script newScriptCode);
      81             :     void pop();
      82             :     void fixup(Script newScriptCode);
      83             : 
      84             :     struct ParenStackEntry {
      85             :         uint32_t endPairChar;
      86             :         Script  scriptCode;
      87             :     };
      88             : 
      89             :     const char16_t *textPtr;
      90             :     uint32_t textLength;
      91             : 
      92             :     uint32_t scriptStart;
      93             :     uint32_t scriptLimit;
      94             :     Script  scriptCode;
      95             : 
      96             :     struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
      97             :     uint32_t parenSP;
      98             :     uint32_t pushCount;
      99             :     uint32_t fixupCount;
     100             : };
     101             : 
     102             : #endif /* GFX_SCRIPTITEMIZER_H */