/*
 * Copyright (C) 2013 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER 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
 * (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 "core/rendering/TextRunConstructor.h"

#include "core/rendering/RenderText.h"
#include "core/rendering/style/RenderStyle.h"
#include "core/rendering/svg/SVGTextRunRenderingContext.h"
#include "platform/text/BidiTextRun.h"

namespace blink {

template <typename CharacterType>
static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
{
    ASSERT(style);

    bool directionalOverride = style->rtlOrdering() == VisualOrder;
    TextRun run(characters, length, 0, 0, expansion, direction, directionalOverride);
    if (textRunNeedsRenderingContext(font))
        run.setRenderingContext(SVGTextRunRenderingContext::create(context));

    return run;
}

template <typename CharacterType>
static inline TextRun constructTextRunInternal(RenderObject* context, const Font& font, const CharacterType* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
{
    ASSERT(style);

    TextDirection textDirection = direction;
    bool directionalOverride = style->rtlOrdering() == VisualOrder;
    if (flags != DefaultTextRunFlags) {
        if (flags & RespectDirection)
            textDirection = style->direction();
        if (flags & RespectDirectionOverride)
            directionalOverride |= isOverride(style->unicodeBidi());
    }

    TextRun run(characters, length, 0, 0, expansion, textDirection, directionalOverride);
    if (textRunNeedsRenderingContext(font))
        run.setRenderingContext(SVGTextRunRenderingContext::create(context));

    return run;
}

TextRun constructTextRun(RenderObject* context, const Font& font, const LChar* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
{
    return constructTextRunInternal(context, font, characters, length, style, direction, expansion);
}

TextRun constructTextRun(RenderObject* context, const Font& font, const UChar* characters, int length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
{
    return constructTextRunInternal(context, font, characters, length, style, direction, expansion);
}

TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
{
    if (text->is8Bit())
        return constructTextRunInternal(context, font, text->characters8(), text->textLength(), style, direction, expansion);
    return constructTextRunInternal(context, font, text->characters16(), text->textLength(), style, direction, expansion);
}

TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion)
{
    ASSERT(offset + length <= text->textLength());
    if (text->is8Bit())
        return constructTextRunInternal(context, font, text->characters8() + offset, length, style, direction, expansion);
    return constructTextRunInternal(context, font, text->characters16() + offset, length, style, direction, expansion);
}

TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextDirection direction, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
{
    unsigned length = string.length();
    if (!length)
        return constructTextRunInternal(context, font, static_cast<const LChar*>(0), length, style, direction, expansion, flags);
    if (string.is8Bit())
        return constructTextRunInternal(context, font, string.characters8(), length, style, direction, expansion, flags);
    return constructTextRunInternal(context, font, string.characters16(), length, style, direction, expansion, flags);
}

TextRun constructTextRun(RenderObject* context, const Font& font, const String& string, RenderStyle* style, TextRun::ExpansionBehavior expansion, TextRunFlags flags)
{
    bool hasStrongDirectionality;
    return constructTextRun(context, font, string, style, determineDirectionality(string, hasStrongDirectionality), expansion, flags);
}

TextRun constructTextRun(RenderObject* context, const Font& font, const RenderText* text, unsigned offset, unsigned length, RenderStyle* style, TextRun::ExpansionBehavior expansion)
{
    ASSERT(offset + length <= text->textLength());
    TextRun run = text->is8Bit()
        ? constructTextRunInternal(context, font, text->characters8() + offset, length, style, LTR, expansion)
        : constructTextRunInternal(context, font, text->characters16() + offset, length, style, LTR, expansion);
    bool hasStrongDirectionality;
    run.setDirection(directionForRun(run, hasStrongDirectionality));
    return run;
}

} // namespace blink