// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 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:
//
//    * 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
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// in the documentation and/or other materials provided with the
// distribution.
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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 consumeDeclarationConditionOrGeneralEnclosed(CSSParserTokenRange&);

    SupportsResult consumeConditionInParenthesis(CSSParserTokenRange&, CSSParserTokenType);

    CSSParserImpl& m_parser;
};

} // namespace WebCore