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#ifndef UTextProvider_h 27#define UTextProvider_h 28 29#include <unicode/utext.h> 30 31namespace WebCore { 32 33enum class UTextProviderContext { 34 NoContext, 35 PriorContext, 36 PrimaryContext 37}; 38 39inline UTextProviderContext uTextProviderContext(const UText* text, int64_t nativeIndex, UBool forward) 40{ 41 if (!text->b || nativeIndex > text->b) 42 return UTextProviderContext::PrimaryContext; 43 if (nativeIndex == text->b) 44 return forward ? UTextProviderContext::PrimaryContext : UTextProviderContext::PriorContext; 45 return UTextProviderContext::PriorContext; 46} 47 48inline void initializeContextAwareUTextProvider(UText* text, const UTextFuncs* funcs, const void* string, unsigned length, const UChar* priorContext, int priorContextLength) 49{ 50 text->pFuncs = funcs; 51 text->providerProperties = 1 << UTEXT_PROVIDER_STABLE_CHUNKS; 52 text->context = string; 53 text->p = string; 54 text->a = length; 55 text->q = priorContext; 56 text->b = priorContextLength; 57} 58 59// Shared implementation for the UTextClone function on UTextFuncs. 60 61UText* uTextCloneImpl(UText* destination, const UText* source, UBool deep, UErrorCode* status); 62 63 64// Helpers for the UTextAccess function on UTextFuncs. 65 66inline int64_t uTextAccessPinIndex(int64_t& index, int64_t limit) 67{ 68 if (index < 0) 69 index = 0; 70 else if (index > limit) 71 index = limit; 72 return index; 73} 74 75inline bool uTextAccessInChunkOrOutOfRange(UText* text, int64_t nativeIndex, int64_t nativeLength, UBool forward, UBool& isAccessible) 76{ 77 if (forward) { 78 if (nativeIndex >= text->chunkNativeStart && nativeIndex < text->chunkNativeLimit) { 79 int64_t offset = nativeIndex - text->chunkNativeStart; 80 // Ensure chunk offset is well formed if computed offset exceeds int32_t range. 81 ASSERT(offset < std::numeric_limits<int32_t>::max()); 82 text->chunkOffset = offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0; 83 isAccessible = TRUE; 84 return true; 85 } 86 if (nativeIndex >= nativeLength && text->chunkNativeLimit == nativeLength) { 87 text->chunkOffset = text->chunkLength; 88 isAccessible = FALSE; 89 return true; 90 } 91 } else { 92 if (nativeIndex > text->chunkNativeStart && nativeIndex <= text->chunkNativeLimit) { 93 int64_t offset = nativeIndex - text->chunkNativeStart; 94 // Ensure chunk offset is well formed if computed offset exceeds int32_t range. 95 ASSERT(offset < std::numeric_limits<int32_t>::max()); 96 text->chunkOffset = offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0; 97 isAccessible = TRUE; 98 return true; 99 } 100 if (nativeIndex <= 0 && !text->chunkNativeStart) { 101 text->chunkOffset = 0; 102 isAccessible = FALSE; 103 return true; 104 } 105 } 106 return false; 107} 108 109} // namespace WebCore 110 111#endif // UTextProvider_h 112