michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  * This file is based on usc_impl.c from ICU 4.2.0.1, slightly adapted
michael@0:  * for use within Mozilla Gecko, separate from a standard ICU build.
michael@0:  *
michael@0:  * The original ICU license of the code follows:
michael@0:  *
michael@0:  * ICU License - ICU 1.8.1 and later
michael@0:  *
michael@0:  * COPYRIGHT AND PERMISSION NOTICE
michael@0:  * 
michael@0:  * Copyright (c) 1995-2009 International Business Machines Corporation and
michael@0:  * others
michael@0:  *
michael@0:  * All rights reserved.
michael@0:  *
michael@0:  * Permission is hereby granted, free of charge, to any person obtaining a
michael@0:  * copy of this software and associated documentation files (the "Software"),
michael@0:  * to deal in the Software without restriction, including without limitation
michael@0:  * the rights to use, copy, modify, merge, publish, distribute, and/or sell
michael@0:  * copies of the Software, and to permit persons to whom the Software is
michael@0:  * furnished to do so, provided that the above copyright notice(s) and this
michael@0:  * permission notice appear in all copies of the Software and that both the
michael@0:  * above copyright notice(s) and this permission notice appear in supporting
michael@0:  * documentation.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
michael@0:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
michael@0:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
michael@0:  * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE
michael@0:  * BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES,
michael@0:  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
michael@0:  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
michael@0:  * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
michael@0:  * SOFTWARE.
michael@0:  *
michael@0:  * Except as contained in this notice, the name of a copyright holder shall
michael@0:  * not be used in advertising or otherwise to promote the sale, use or other
michael@0:  * dealings in this Software without prior written authorization of the
michael@0:  * copyright holder.
michael@0:  *
michael@0:  * All trademarks and registered trademarks mentioned herein are the property
michael@0:  * of their respective owners. 
michael@0:  */
michael@0: 
michael@0: #ifndef GFX_SCRIPTITEMIZER_H
michael@0: #define GFX_SCRIPTITEMIZER_H
michael@0: 
michael@0: #include <stdint.h>
michael@0: #include "nsUnicodeScriptCodes.h"
michael@0: 
michael@0: #define PAREN_STACK_DEPTH 32
michael@0: 
michael@0: class gfxScriptItemizer
michael@0: {
michael@0: public:
michael@0:     gfxScriptItemizer(const char16_t *src, uint32_t length);
michael@0: 
michael@0:     void SetText(const char16_t *src, uint32_t length);
michael@0: 
michael@0:     bool Next(uint32_t& aRunStart, uint32_t& aRunLimit,
michael@0:               int32_t& aRunScript);
michael@0: 
michael@0: protected:
michael@0:     void reset() {
michael@0:         scriptStart = 0;
michael@0:         scriptLimit = 0;
michael@0:         scriptCode  = MOZ_SCRIPT_INVALID;
michael@0:         parenSP     = -1;
michael@0:         pushCount   =  0;
michael@0:         fixupCount  =  0;
michael@0:     }
michael@0: 
michael@0:     void push(uint32_t endPairChar, int32_t scriptCode);
michael@0:     void pop();
michael@0:     void fixup(int32_t scriptCode);
michael@0: 
michael@0:     struct ParenStackEntry {
michael@0:         uint32_t endPairChar;
michael@0:         int32_t  scriptCode;
michael@0:     };
michael@0: 
michael@0:     const char16_t *textPtr;
michael@0:     uint32_t textLength;
michael@0: 
michael@0:     uint32_t scriptStart;
michael@0:     uint32_t scriptLimit;
michael@0:     int32_t  scriptCode;
michael@0: 
michael@0:     struct ParenStackEntry parenStack[PAREN_STACK_DEPTH];
michael@0:     uint32_t parenSP;
michael@0:     uint32_t pushCount;
michael@0:     uint32_t fixupCount;
michael@0: };
michael@0: 
michael@0: #endif /* GFX_SCRIPTITEMIZER_H */