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
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19  * All rights reserved.
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22  * copy of this software and associated documentation files (the "Software"),
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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  *
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37  * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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39  * SOFTWARE.
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41  * Except as contained in this notice, the name of a copyright holder shall
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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     void reset() {
72         scriptStart = 0;
73         scriptLimit = 0;
74         scriptCode  = Script::INVALID;
75         parenSP     = -1;
76         pushCount   =  0;
77         fixupCount  =  0;
78     }
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 */
103