Source/WebCore/css/parser/CSSSupportsParser.h

// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple Inc. All rights reserved.
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#pragma once

#include "CSSParserToken.h"

namespace WebCore {

class CSSParserImpl;
class CSSParserTokenRange;
    
class CSSSupportsParser {
public:
    enum SupportsResult {
        Unsupported = false,
        Supported = true,
        Invalid
    };

    enum SupportsParsingMode {
        ForAtRule,
        ForWindowCSS,
    };

    static SupportsResult supportsCondition(CSSParserTokenRange, CSSParserImpl&, SupportsParsingMode);

private:
    CSSSupportsParser(CSSParserImpl& parser)
        : m_parser(parser) { }

    SupportsResult consumeCondition(CSSParserTokenRange);
    SupportsResult consumeNegation(CSSParserTokenRange);
    SupportsResult consumeSupportsFeatureOrGeneralEnclosed(CSSParserTokenRange&);
    // https://drafts.csswg.org/css-conditional-4/#typedef-supports-selector-fn
    // <supports-seletor-fn> = selector( <complex-selector> );
    SupportsResult consumeSupportsSelectorFunction(CSSParserTokenRange&);

    SupportsResult consumeConditionInParenthesis(CSSParserTokenRange&, CSSParserTokenType);

    CSSParserImpl& m_parser;
};

} // namespace WebCore