blob: c8f28d6ed3dad711b7906dded22895e508804ca4 [file] [log] [blame]
/*
* Copyright (C) 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <unicode/utext.h>
namespace WTF {
enum class UTextProviderContext {
NoContext,
PriorContext,
PrimaryContext
};
inline UTextProviderContext uTextProviderContext(const UText* text, int64_t nativeIndex, UBool forward)
{
if (!text->b || nativeIndex > text->b)
return UTextProviderContext::PrimaryContext;
if (nativeIndex == text->b)
return forward ? UTextProviderContext::PrimaryContext : UTextProviderContext::PriorContext;
return UTextProviderContext::PriorContext;
}
inline void initializeContextAwareUTextProvider(UText* text, const UTextFuncs* funcs, const void* string, unsigned length, const UChar* priorContext, int priorContextLength)
{
text->pFuncs = funcs;
text->providerProperties = 1 << UTEXT_PROVIDER_STABLE_CHUNKS;
text->context = string;
text->p = string;
text->a = length;
text->q = priorContext;
text->b = priorContextLength;
}
// Shared implementation for the UTextClone function on UTextFuncs.
UText* uTextCloneImpl(UText* destination, const UText* source, UBool deep, UErrorCode* status);
// Helpers for the UTextAccess function on UTextFuncs.
inline int64_t uTextAccessPinIndex(int64_t& index, int64_t limit)
{
if (index < 0)
index = 0;
else if (index > limit)
index = limit;
return index;
}
inline bool uTextAccessInChunkOrOutOfRange(UText* text, int64_t nativeIndex, int64_t nativeLength, UBool forward, UBool& isAccessible)
{
if (forward) {
if (nativeIndex >= text->chunkNativeStart && nativeIndex < text->chunkNativeLimit) {
int64_t offset = nativeIndex - text->chunkNativeStart;
// Ensure chunk offset is well formed if computed offset exceeds int32_t range.
ASSERT(offset < std::numeric_limits<int32_t>::max());
text->chunkOffset = offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0;
isAccessible = TRUE;
return true;
}
if (nativeIndex >= nativeLength && text->chunkNativeLimit == nativeLength) {
text->chunkOffset = text->chunkLength;
isAccessible = FALSE;
return true;
}
} else {
if (nativeIndex > text->chunkNativeStart && nativeIndex <= text->chunkNativeLimit) {
int64_t offset = nativeIndex - text->chunkNativeStart;
// Ensure chunk offset is well formed if computed offset exceeds int32_t range.
ASSERT(offset < std::numeric_limits<int32_t>::max());
text->chunkOffset = offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0;
isAccessible = TRUE;
return true;
}
if (nativeIndex <= 0 && !text->chunkNativeStart) {
text->chunkOffset = 0;
isAccessible = FALSE;
return true;
}
}
return false;
}
} // namespace WTF