Source/WebCore/css/CSSLayerRule.cpp

/*
 * Copyright (C) 2021 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 THE COPYRIGHT HOLDER "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 HOLDER 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 "CSSLayerRule.h"

#include "CSSStyleSheet.h"
#include "StyleRule.h"
#include <wtf/text/StringBuilder.h>

namespace WebCore {

CSSLayerRule::CSSLayerRule(StyleRuleLayer& rule, CSSStyleSheet* parent)
    : CSSGroupingRule(rule, parent)
{
}

Ref<CSSLayerRule> CSSLayerRule::create(StyleRuleLayer& rule, CSSStyleSheet* parent)
{
    return adoptRef(*new CSSLayerRule(rule, parent));
}

String CSSLayerRule::cssText() const
{
    auto& layer = downcast<StyleRuleLayer>(groupRule());

    StringBuilder result;

    auto appendLayerName = [&](auto& name) {
        for (auto& segment : name) {
            result.append(segment);
            if (&segment != &name.last())
                result.append('.');
        }
    };

    if (layer.isStatement()) {
        result.append("@layer ");
        for (auto& name : layer.nameList()) {
            appendLayerName(name);
            if (&name != &layer.nameList().last())
                result.append(", ");
        }
        result.append(';');
        return result.toString();
    }

    result.append("@layer ");
    if (!layer.name().isEmpty()) {
        appendLayerName(layer.name());
        result.append(' ');
    }
    result.append("{\n");
    appendCSSTextForItems(result);
    result.append('}');
    return result.toString();
}

} // namespace WebCore