/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* 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 */