source: webkit/trunk/Source/WebCore/css/CSSLayerBlockRule.cpp

/*
 * Copyright (C) 2021 Apple Inc. All rights reserved.
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#include "config.h"
#include "CSSLayerBlockRule.h"

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

namespace WebCore {

CSSLayerBlockRule::CSSLayerBlockRule(StyleRuleLayer& rule, CSSStyleSheet* parent)
    : CSSGroupingRule(rule, parent)
{
    ASSERT(!rule.isStatement());
}

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

String CSSLayerBlockRule::cssText() const
{
    StringBuilder result;

    result.append("@layer ");
    if (auto name = this->name(); !name.isEmpty())
        result.append(name, " ");
    result.append("{\n");
    appendCSSTextForItems(result);
    result.append('}');

    return result.toString();
}

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

    if (layer.name().isEmpty())
        return emptyString();

    return stringFromCascadeLayerName(layer.name());
}

String stringFromCascadeLayerName(const CascadeLayerName& name)
{
    StringBuilder result;
    for (auto& segment : name) {
        serializeIdentifier(segment, result);
        if (&segment != &name.last())
            result.append('.');
    }
    return result.toString();
}

} // namespace WebCore