Source/WebCore/layout/inlineformatting/InlineLineBreaker.h

/*
 * Copyright (C) 2018 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.
 */

#pragma once

#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

#include "InlineLineLayout.h"
#include "LayoutUnit.h"

namespace WebCore {
namespace Layout {

class InlineItem;
class InlineTextItem;

class LineBreaker {
public:
    struct BreakingContext {
        enum class ContentBreak { Keep, Split, Wrap };
        ContentBreak contentBreak;
        struct TrailingPartialContent {
            unsigned runIndex { 0 };
            unsigned length { 0 };
            LayoutUnit logicalWidth;
        };
        Optional<TrailingPartialContent> trailingPartialContent;
    };
    BreakingContext breakingContextForInlineContent(const Vector<LineLayout::Run>&, LayoutUnit logicalWidth, LayoutUnit availableWidth, bool lineIsEmpty);
    bool shouldWrapFloatBox(LayoutUnit floatLogicalWidth, LayoutUnit availableWidth, bool lineIsEmpty);

private:

    Optional<BreakingContext::TrailingPartialContent> wordBreakingBehavior(const Vector<LineLayout::Run>&, LayoutUnit availableWidth) const;

    struct SplitLengthAndWidth {
        unsigned length { 0 };
        LayoutUnit leftLogicalWidth;
    };
    Optional<SplitLengthAndWidth> tryBreakingTextRun(const LineLayout::Run overflowRun, LayoutUnit availableWidth) const;
};

}
}
#endif