TextBreakIteratorICU.cpp   [plain text]

/*
 * Copyright (C) 2006 Lars Knoll <lars@trolltech.com>
 * Copyright (C) 2007 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.
 *
 */

#include "config.h"
#include "TextBreakIterator.h"

#include "LineBreakIteratorPoolICU.h"
#include "PlatformString.h"

#include "WebCoreThread.h"

using namespace std;

namespace WebCore {

static TextBreakIterator* setUpIterator(bool& createdIterator, TextBreakIterator*& iterator,
    UBreakIteratorType type, const UChar* string, int length)
{
    if (!string)
        return 0;

    if (!createdIterator) {
        UErrorCode openStatus = U_ZERO_ERROR;
        iterator = reinterpret_cast<TextBreakIterator*>(ubrk_open(type, currentTextBreakLocaleID(), 0, 0, &openStatus));
        createdIterator = true;
        ASSERT_WITH_MESSAGE(U_SUCCESS(openStatus), "ICU could not open a break iterator: %s (%d)", u_errorName(openStatus), openStatus);
    }
    if (!iterator)
        return 0;

    UErrorCode setTextStatus = U_ZERO_ERROR;
    ubrk_setText(reinterpret_cast<UBreakIterator*>(iterator), string, length, &setTextStatus);
    if (U_FAILURE(setTextStatus))
        return 0;

    return iterator;
}

TextBreakIterator* characterBreakIterator(const UChar* string, int length)
{
    static bool createdCharacterBreakIterator = false;
    static TextBreakIterator* staticCharacterBreakIterator;
    return setUpIterator(createdCharacterBreakIterator,
        staticCharacterBreakIterator, UBRK_CHARACTER, string, length);
}

TextBreakIterator* wordBreakIterator(const UChar* string, int length)
{
    static bool createdWordBreakIterator = false;
    static TextBreakIterator* staticWordBreakIterator;
    return setUpIterator(createdWordBreakIterator,
        staticWordBreakIterator, UBRK_WORD, string, length);
}

TextBreakIterator* acquireLineBreakIterator(const UChar* string, int length, const AtomicString& locale)
{
    UBreakIterator* iterator = LineBreakIteratorPool::sharedPool().take(locale);

    UErrorCode setTextStatus = U_ZERO_ERROR;
    ubrk_setText(iterator, string, length, &setTextStatus);
    if (U_FAILURE(setTextStatus)) {
        LOG_ERROR("ubrk_setText failed with status %d", setTextStatus);
        return 0;
    }

    return reinterpret_cast<TextBreakIterator*>(iterator);
}

void releaseLineBreakIterator(TextBreakIterator* iterator)
{
    ASSERT_ARG(iterator, iterator);

    LineBreakIteratorPool::sharedPool().put(reinterpret_cast<UBreakIterator*>(iterator));
}

TextBreakIterator* sentenceBreakIterator(const UChar* string, int length)
{
    static bool createdSentenceBreakIterator = false;
    static TextBreakIterator* staticSentenceBreakIterator;
    return setUpIterator(createdSentenceBreakIterator,
        staticSentenceBreakIterator, UBRK_SENTENCE, string, length);
}

int textBreakFirst(TextBreakIterator* iterator)
{
    return ubrk_first(reinterpret_cast<UBreakIterator*>(iterator));
}

int textBreakLast(TextBreakIterator* iterator)
{
    return ubrk_last(reinterpret_cast<UBreakIterator*>(iterator));
}

int textBreakNext(TextBreakIterator* iterator)
{
    return ubrk_next(reinterpret_cast<UBreakIterator*>(iterator));
}

int textBreakPrevious(TextBreakIterator* iterator)
{
    return ubrk_previous(reinterpret_cast<UBreakIterator*>(iterator));
}

int textBreakPreceding(TextBreakIterator* iterator, int pos)
{
    return ubrk_preceding(reinterpret_cast<UBreakIterator*>(iterator), pos);
}

int textBreakFollowing(TextBreakIterator* iterator, int pos)
{
    return ubrk_following(reinterpret_cast<UBreakIterator*>(iterator), pos);
}

int textBreakCurrent(TextBreakIterator* iterator)
{
    return ubrk_current(reinterpret_cast<UBreakIterator*>(iterator));
}

bool isTextBreak(TextBreakIterator* iterator, int position)
{
    return ubrk_isBoundary(reinterpret_cast<UBreakIterator*>(iterator), position);
}


TextBreakIterator* cursorMovementIterator(const UChar* string, int length)
{
    // Use the special Thai character break iterator for all locales
    static bool createdCursorBreakIterator = false;
    static TextBreakIterator* staticCursorBreakIterator;

    if (!string)
        return 0;
    
    if (!createdCursorBreakIterator) {
        UErrorCode openStatus = U_ZERO_ERROR;
        staticCursorBreakIterator = static_cast<TextBreakIterator*>(ubrk_open(UBRK_CHARACTER, "th", 0, 0, &openStatus));
        createdCursorBreakIterator = true;
        ASSERT_WITH_MESSAGE(U_SUCCESS(openStatus), "ICU could not open a break iterator: %s (%d)", u_errorName(openStatus), openStatus);
    }
    if (!staticCursorBreakIterator)
        return 0;
    
    UErrorCode setTextStatus = U_ZERO_ERROR;
    ubrk_setText(staticCursorBreakIterator, string, length, &setTextStatus);
    if (U_FAILURE(setTextStatus))
        return 0;
    
    return staticCursorBreakIterator;
}

}