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/*
* Copyright (C) 2017-2023 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include <unicode/ubrk.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringView.h>
#include <wtf/text/icu/UTextProviderLatin1.h>
#include <wtf/text/icu/UTextProviderUTF16.h>
#include <wtf/unicode/icu/ICUHelpers.h>
namespace WTF {
class TextBreakIteratorICU {
WTF_DEPRECATED_MAKE_FAST_ALLOCATED(TextBreakIteratorICU);
public:
struct LineMode {
enum class Behavior: uint8_t {
Default,
Loose,
Normal,
Strict,
};
Behavior behavior;
};
struct CharacterMode {
};
using Mode = Variant<LineMode, CharacterMode>;
TextBreakIteratorICU(StringView string, std::span<const char16_t> priorContext, Mode mode, const AtomString& locale)
{
auto type = switchOn(mode, [](LineMode) {
return UBRK_LINE;
}, [](CharacterMode) {
return UBRK_CHARACTER;
});
auto localeWithOptionalBreakKeyword = switchOn(mode, [&locale](LineMode lineMode) {
return makeLocaleWithBreakKeyword(locale, lineMode.behavior);
}, [&locale](CharacterMode) {
return locale;
});
UErrorCode status = U_ZERO_ERROR;
m_iterator = ubrk_open(type, localeWithOptionalBreakKeyword.string().utf8().data(), nullptr, 0, &status);
if (!m_iterator || U_FAILURE(status)) {
status = U_ZERO_ERROR;
m_iterator = ubrk_open(type, "", nullptr, 0, &status); // There's no reason for this to ever fail, unless there's an allocation failure, in which case we _should_ crash; that's the behavior of our allocators.
}
RELEASE_ASSERT(m_iterator);
RELEASE_ASSERT(U_SUCCESS(status));
setText(string, priorContext);
}
TextBreakIteratorICU() = delete;
TextBreakIteratorICU(const TextBreakIteratorICU&) = delete;
TextBreakIteratorICU(TextBreakIteratorICU&& other)
: m_iterator(std::exchange(other.m_iterator, nullptr))
, m_priorContextLength(other.m_priorContextLength)
{
}
TextBreakIteratorICU& operator=(const TextBreakIteratorICU&) = delete;
TextBreakIteratorICU& operator=(TextBreakIteratorICU&& other)
{
if (m_iterator)
ubrk_close(m_iterator);
m_iterator = std::exchange(other.m_iterator, nullptr);
return *this;
}
~TextBreakIteratorICU()
{
if (m_iterator)
ubrk_close(m_iterator); // FIXME: Use an RAII wrapper for this
}
void setText(StringView string, std::span<const char16_t> priorContext)
{
ASSERT(m_iterator);
UTextWithBuffer textLocal;
textLocal.text = UTEXT_INITIALIZER;
textLocal.text.extraSize = sizeof(textLocal.buffer);
textLocal.text.pExtra = textLocal.buffer;
UErrorCode status = U_ZERO_ERROR;
UText* text = nullptr;
if (string.is8Bit())
text = openLatin1ContextAwareUTextProvider(&textLocal, string.span8(), priorContext, &status);
else
text = openUTF16ContextAwareUTextProvider(&textLocal.text, string.span16(), priorContext, &status);
ASSERT(U_SUCCESS(status));
ASSERT(text);
if (text && U_SUCCESS(status)) {
ubrk_setUText(m_iterator, text, &status);
ASSERT(U_SUCCESS(status));
utext_close(text);
m_priorContextLength = priorContext.size();
} else
m_priorContextLength = 0;
}
std::optional<unsigned> preceding(unsigned location) const
{
if (!location)
return { };
auto result = ubrk_preceding(m_iterator, location + m_priorContextLength);
if (result == UBRK_DONE)
return { };
return std::max(static_cast<unsigned>(result), m_priorContextLength) - m_priorContextLength;
}
std::optional<unsigned> following(unsigned location) const
{
auto result = ubrk_following(m_iterator, location + m_priorContextLength);
if (result == UBRK_DONE)
return { };
return result - m_priorContextLength;
}
bool isBoundary(unsigned location) const
{
return ubrk_isBoundary(m_iterator, location + m_priorContextLength);
}
private:
static AtomString makeLocaleWithBreakKeyword(const AtomString& locale, LineMode::Behavior behavior)
{
if (behavior == LineMode::Behavior::Default)
return locale;
// The uloc functions model locales as char*, so we have to downconvert our AtomString.
auto utf8Locale = locale.string().utf8();
if (!utf8Locale.length())
return locale;
Vector<char> scratchBuffer(utf8Locale.length() + 11, 0);
memcpySpan(scratchBuffer.mutableSpan(), utf8Locale.span());
const char* keywordValue = nullptr;
switch (behavior) {
case LineMode::Behavior::Default:
// nullptr will cause any existing values to be removed.
ASSERT_NOT_REACHED();
break;
case LineMode::Behavior::Loose:
keywordValue = "loose";
break;
case LineMode::Behavior::Normal:
keywordValue = "normal";
break;
case LineMode::Behavior::Strict:
keywordValue = "strict";
break;
}
UErrorCode status = U_ZERO_ERROR;
int32_t lengthNeeded = uloc_setKeywordValue("lb", keywordValue, scratchBuffer.mutableSpan().data(), scratchBuffer.size(), &status);
if (U_SUCCESS(status))
return AtomString::fromUTF8(scratchBuffer.subspan(0, lengthNeeded));
if (needsToGrowToProduceBuffer(status)) {
scratchBuffer.grow(lengthNeeded + 1);
zeroSpan(scratchBuffer.mutableSpan().subspan(utf8Locale.length()));
status = U_ZERO_ERROR;
int32_t lengthNeeded2 = uloc_setKeywordValue("lb", keywordValue, scratchBuffer.mutableSpan().data(), scratchBuffer.size(), &status);
if (!U_SUCCESS(status) || lengthNeeded != lengthNeeded2)
return locale;
return AtomString::fromUTF8(scratchBuffer.subspan(0, lengthNeeded));
}
return locale;
}
UBreakIterator* m_iterator { nullptr };
unsigned m_priorContextLength { 0 };
};
}
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