Source/WebCore/rendering/style/GridPosition.cpp

/*
 * Copyright (C) 2017 Igalia S.L.
 *
 * 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.
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 * 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,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

#include "config.h"
#include "GridPosition.h"

#include <wtf/text/TextStream.h>

namespace WebCore {

std::optional<int> GridPosition::gMaxPositionForTesting;
static const int kGridMaxPosition = 1000000;

void GridPosition::setExplicitPosition(int position, const String& namedGridLine)
{
    m_type = ExplicitPosition;
    setIntegerPosition(position);
    m_namedGridLine = namedGridLine;
}

void GridPosition::setAutoPosition()
{
    m_type = AutoPosition;
    m_integerPosition = 0;
}

// 'span' values cannot be negative, yet we reuse the <integer> position which can
// be. This means that we have to convert the span position to an integer, losing
// some precision here. It shouldn't be an issue in practice though.
void GridPosition::setSpanPosition(int position, const String& namedGridLine)
{
    m_type = SpanPosition;
    setIntegerPosition(position);
    m_namedGridLine = namedGridLine;
}

void GridPosition::setNamedGridArea(const String& namedGridArea)
{
    m_type = NamedGridAreaPosition;
    m_namedGridLine = namedGridArea;
}

int GridPosition::integerPosition() const
{
    ASSERT(type() == ExplicitPosition);
    return m_integerPosition;
}

String GridPosition::namedGridLine() const
{
    ASSERT(type() == ExplicitPosition || type() == SpanPosition || type() == NamedGridAreaPosition);
    return m_namedGridLine;
}

int GridPosition::spanPosition() const
{
    ASSERT(type() == SpanPosition);
    return m_integerPosition;
}

int GridPosition::max()
{
    return gMaxPositionForTesting.value_or(kGridMaxPosition);
}

int GridPosition::min()
{
    return -max();
}

bool GridPosition::operator==(const GridPosition& other) const
{
    return m_type == other.m_type && m_integerPosition == other.m_integerPosition && m_namedGridLine == other.m_namedGridLine;
}

void GridPosition::setMaxPositionForTesting(unsigned maxPosition)
{
    gMaxPositionForTesting = static_cast<int>(maxPosition);
}

TextStream& operator<<(TextStream& ts, const GridPosition& o)
{
    switch (o.type()) {
    case AutoPosition:
        return ts << "auto";
    case ExplicitPosition:
        return ts << o.namedGridLine() << " " << o.integerPosition();
    case SpanPosition:
        return ts << "span" << " " << o.namedGridLine() << " " << o.integerPosition();
    case NamedGridAreaPosition:
        return ts << o.namedGridLine();
    }
    return ts;
}

} // namespace WebCore