/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted
 * for use within Mozilla Gecko, separate from a standard ICU build.
 *
 * The original ICU license of the code follows:
 *
 * ICU License - ICU 1.8.1 and later
 *
 * COPYRIGHT AND PERMISSION NOTICE
 *
 * Copyright (c) 1995-2009 International Business Machines Corporation and
 * others
 *
 * All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, provided that the above copyright notice(s) and this
 * permission notice appear in all copies of the Software and that both the
 * above copyright notice(s) and this permission notice appear in supporting
 * documentation.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
 * BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 *
 * Except as contained in this notice, the name of a copyright holder shall
 * not be used in advertising or otherwise to promote the sale, use or other
 * dealings in this Software without prior written authorization of the
 * copyright holder.
 *
 * All trademarks and registered trademarks mentioned herein are the property
 * of their respective owners.
 */

#ifndef GFX_SCRIPTITEMIZER_H
#define GFX_SCRIPTITEMIZER_H

#include <stdint.h>
#include "nsUnicodeScriptCodes.h"

#define PAREN_STACK_DEPTH 32

class gfxScriptItemizer {
 public:
  typedef mozilla::unicode::Script Script;

  gfxScriptItemizer(const char16_t* src, uint32_t length);

  void SetText(const char16_t* src, uint32_t length);

  bool Next(uint32_t& aRunStart, uint32_t& aRunLimit, Script& aRunScript);

 protected:
  void reset() {
    scriptStart = 0;
    scriptLimit = 0;
    scriptCode = Script::INVALID;
    parenSP = -1;
    pushCount = 0;
    fixupCount = 0;
  }

  void push(uint32_t endPairChar, Script newScriptCode);
  void pop();
  void fixup(Script newScriptCode);

  struct ParenStackEntry {
    uint32_t endPairChar;
    Script scriptCode;
  };

  const char16_t* textPtr;
  uint32_t textLength;

  uint32_t scriptStart;
  uint32_t scriptLimit;
  Script scriptCode;

  struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
  uint32_t parenSP;
  uint32_t pushCount;
  uint32_t fixupCount;
};

#endif /* GFX_SCRIPTITEMIZER_H */