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/*
* 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.
*/
#include "config.h"
#include "UTextProviderUTF16.h"
#include "UTextProvider.h"
namespace WebCore {
// UTF16ContextAware provider
static UText* uTextUTF16ContextAwareClone(UText*, const UText*, UBool, UErrorCode*);
static int64_t uTextUTF16ContextAwareNativeLength(UText*);
static UBool uTextUTF16ContextAwareAccess(UText*, int64_t, UBool);
static int32_t uTextUTF16ContextAwareExtract(UText*, int64_t, int64_t, UChar*, int32_t, UErrorCode*);
static void uTextUTF16ContextAwareClose(UText*);
static const struct UTextFuncs textUTF16ContextAwareFuncs = {
sizeof(UTextFuncs),
0,
0,
0,
uTextUTF16ContextAwareClone,
uTextUTF16ContextAwareNativeLength,
uTextUTF16ContextAwareAccess,
uTextUTF16ContextAwareExtract,
nullptr,
nullptr,
nullptr,
nullptr,
uTextUTF16ContextAwareClose,
nullptr,
nullptr,
nullptr
};
static inline UTextProviderContext textUTF16ContextAwareGetCurrentContext(const UText* text)
{
if (!text->chunkContents)
return UTextProviderContext::NoContext;
return text->chunkContents == text->p ? UTextProviderContext::PrimaryContext : UTextProviderContext::PriorContext;
}
static void textUTF16ContextAwareMoveInPrimaryContext(UText* text, int64_t nativeIndex, int64_t nativeLength, UBool forward)
{
ASSERT(text->chunkContents == text->p);
ASSERT_UNUSED(forward, forward ? nativeIndex >= text->b : nativeIndex > text->b);
ASSERT_UNUSED(forward, forward ? nativeIndex < nativeLength : nativeIndex <= nativeLength);
text->chunkNativeStart = text->b;
text->chunkNativeLimit = nativeLength;
int64_t length = text->chunkNativeLimit - text->chunkNativeStart;
// Ensure chunk length is well defined if computed length exceeds int32_t range.
ASSERT(length < std::numeric_limits<int32_t>::max());
text->chunkLength = length < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(length) : 0;
text->nativeIndexingLimit = text->chunkLength;
int64_t offset = nativeIndex - text->chunkNativeStart;
// Ensure chunk offset is well defined if computed offset exceeds int32_t range or chunk length.
ASSERT(offset < std::numeric_limits<int32_t>::max());
text->chunkOffset = std::min(offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0, text->chunkLength);
}
static void textUTF16ContextAwareSwitchToPrimaryContext(UText* text, int64_t nativeIndex, int64_t nativeLength, UBool forward)
{
ASSERT(!text->chunkContents || text->chunkContents == text->q);
text->chunkContents = static_cast<const UChar*>(text->p);
textUTF16ContextAwareMoveInPrimaryContext(text, nativeIndex, nativeLength, forward);
}
static void textUTF16ContextAwareMoveInPriorContext(UText* text, int64_t nativeIndex, int64_t nativeLength, UBool forward)
{
ASSERT(text->chunkContents == text->q);
ASSERT(forward ? nativeIndex < text->b : nativeIndex <= text->b);
ASSERT_UNUSED(nativeLength, forward ? nativeIndex < nativeLength : nativeIndex <= nativeLength);
ASSERT_UNUSED(forward, forward ? nativeIndex < nativeLength : nativeIndex <= nativeLength);
text->chunkNativeStart = 0;
text->chunkNativeLimit = text->b;
text->chunkLength = text->b;
text->nativeIndexingLimit = text->chunkLength;
int64_t offset = nativeIndex - text->chunkNativeStart;
// Ensure chunk offset is well defined if computed offset exceeds int32_t range or chunk length.
ASSERT(offset < std::numeric_limits<int32_t>::max());
text->chunkOffset = std::min(offset < std::numeric_limits<int32_t>::max() ? static_cast<int32_t>(offset) : 0, text->chunkLength);
}
static void textUTF16ContextAwareSwitchToPriorContext(UText* text, int64_t nativeIndex, int64_t nativeLength, UBool forward)
{
ASSERT(!text->chunkContents || text->chunkContents == text->p);
text->chunkContents = static_cast<const UChar*>(text->q);
textUTF16ContextAwareMoveInPriorContext(text, nativeIndex, nativeLength, forward);
}
static UText* uTextUTF16ContextAwareClone(UText* destination, const UText* source, UBool deep, UErrorCode* status)
{
return uTextCloneImpl(destination, source, deep, status);
}
static inline int64_t uTextUTF16ContextAwareNativeLength(UText* text)
{
return text->a + text->b;
}
static UBool uTextUTF16ContextAwareAccess(UText* text, int64_t nativeIndex, UBool forward)
{
if (!text->context)
return false;
int64_t nativeLength = uTextUTF16ContextAwareNativeLength(text);
UBool isAccessible;
if (uTextAccessInChunkOrOutOfRange(text, nativeIndex, nativeLength, forward, isAccessible))
return isAccessible;
nativeIndex = uTextAccessPinIndex(nativeIndex, nativeLength);
UTextProviderContext currentContext = textUTF16ContextAwareGetCurrentContext(text);
UTextProviderContext newContext = uTextProviderContext(text, nativeIndex, forward);
ASSERT(newContext != UTextProviderContext::NoContext);
if (newContext == currentContext) {
if (currentContext == UTextProviderContext::PrimaryContext)
textUTF16ContextAwareMoveInPrimaryContext(text, nativeIndex, nativeLength, forward);
else
textUTF16ContextAwareMoveInPriorContext(text, nativeIndex, nativeLength, forward);
} else if (newContext == UTextProviderContext::PrimaryContext)
textUTF16ContextAwareSwitchToPrimaryContext(text, nativeIndex, nativeLength, forward);
else {
ASSERT(newContext == UTextProviderContext::PriorContext);
textUTF16ContextAwareSwitchToPriorContext(text, nativeIndex, nativeLength, forward);
}
return true;
}
static int32_t uTextUTF16ContextAwareExtract(UText*, int64_t, int64_t, UChar*, int32_t, UErrorCode* errorCode)
{
// In the present context, this text provider is used only with ICU functions
// that do not perform an extract operation.
ASSERT_NOT_REACHED();
*errorCode = U_UNSUPPORTED_ERROR;
return 0;
}
static void uTextUTF16ContextAwareClose(UText* text)
{
text->context = nullptr;
}
UText* openUTF16ContextAwareUTextProvider(UText* text, const UChar* string, unsigned length, const UChar* priorContext, int priorContextLength, UErrorCode* status)
{
if (U_FAILURE(*status))
return 0;
if (!string || length > static_cast<unsigned>(std::numeric_limits<int32_t>::max())) {
*status = U_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
text = utext_setup(text, 0, status);
if (U_FAILURE(*status)) {
ASSERT(!text);
return 0;
}
initializeContextAwareUTextProvider(text, &textUTF16ContextAwareFuncs, string, length, priorContext, priorContextLength);
return text;
}
} // namespace WebCore
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