1/*
2 * Copyright (C) 2014 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <unicode/utext.h>
29
30namespace WTF {
31
32enum class UTextProviderContext {
33 NoContext,
34 PriorContext,
35 PrimaryContext
36};
37
38inline UTextProviderContext uTextProviderContext(const UText* text, int64_t nativeIndex, UBool forward)
39{
40 if (!text->b || nativeIndex > text->b)
41 return UTextProviderContext::PrimaryContext;
42 if (nativeIndex == text->b)
43 return forward ? UTextProviderContext::PrimaryContext : UTextProviderContext::PriorContext;
44 return UTextProviderContext::PriorContext;
45}
46
47inline void initializeContextAwareUTextProvider(UText* text, const UTextFuncs* funcs, const void* string, unsigned length, const UChar* priorContext, int priorContextLength)
48{
49 text->pFuncs = funcs;
50 text->providerProperties = 1 << UTEXT_PROVIDER_STABLE_CHUNKS;
51 text->context = string;
52 text->p = string;
53 text->a = length;
54 text->q = priorContext;
55 text->b = priorContextLength;
56}
57
58// Shared implementation for the UTextClone function on UTextFuncs.
59
60UText* uTextCloneImpl(UText* destination, const UText* source, UBool deep, UErrorCode* status);
61
62
63// Helpers for the UTextAccess function on UTextFuncs.
64
65inline int64_t uTextAccessPinIndex(int64_t& index, int64_t limit)
66{
67 if (index < 0)
68 index = 0;
69 else if (index > limit)
70 index = limit;
71 return index;
72}
73
74inline bool uTextAccessInChunkOrOutOfRange(UText* text, int64_t nativeIndex, int64_t nativeLength, UBool forward, UBool& isAccessible)
75{
76 if (forward) {
77 if (nativeIndex >= text->chunkNativeStart && nativeIndex < text->chunkNativeLimit) {
78 int64_t offset = nativeIndex - text->chunkNativeStart;
79 // Ensure chunk offset is well formed if computed offset exceeds int32_t range.
80 ASSERT(offset < std::numeric_limits<int32_t>::max());
81 text->chunkOffset = offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0;
82 isAccessible = TRUE;
83 return true;
84 }
85 if (nativeIndex >= nativeLength && text->chunkNativeLimit == nativeLength) {
86 text->chunkOffset = text->chunkLength;
87 isAccessible = FALSE;
88 return true;
89 }
90 } else {
91 if (nativeIndex > text->chunkNativeStart && nativeIndex <= text->chunkNativeLimit) {
92 int64_t offset = nativeIndex - text->chunkNativeStart;
93 // Ensure chunk offset is well formed if computed offset exceeds int32_t range.
94 ASSERT(offset < std::numeric_limits<int32_t>::max());
95 text->chunkOffset = offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0;
96 isAccessible = TRUE;
97 return true;
98 }
99 if (nativeIndex <= 0 && !text->chunkNativeStart) {
100 text->chunkOffset = 0;
101 isAccessible = FALSE;
102 return true;
103 }
104 }
105 return false;
106}
107
108} // namespace WTF
109