Source/WebCore/platform/text/TextBoundaries.h

/*
 * Copyright (C) 2004, 2006 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. ``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
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef TextBoundaries_h
#define TextBoundaries_h

#include <unicode/uchar.h>
#include <wtf/Forward.h>

namespace WebCore {

    inline bool requiresContextForWordBoundary(UChar32 character)
    {
        // FIXME: This function won't be needed when https://bugs.webkit.org/show_bug.cgi?id=120656 is fixed.

        // We can get rid of this constant if we require a newer version of the ICU headers.
        const int WK_U_LB_CONDITIONAL_JAPANESE_STARTER = 37;

        int lineBreak = u_getIntPropertyValue(character, UCHAR_LINE_BREAK);
        return lineBreak == U_LB_COMPLEX_CONTEXT || lineBreak == WK_U_LB_CONDITIONAL_JAPANESE_STARTER || lineBreak == U_LB_IDEOGRAPHIC;
    }

    unsigned endOfFirstWordBoundaryContext(StringView);
    unsigned startOfLastWordBoundaryContext(StringView);

    void findWordBoundary(StringView, int position, int* start, int* end);
    void findEndWordBoundary(StringView, int position, int* end);
    int findNextWordFromIndex(StringView, int position, bool forward);

}

#endif