// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple Inc. All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
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#pragma once

#include "CSSParserEnum.h"
#include "CSSParserToken.h"

namespace WebCore {

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

    enum class ParsingMode : bool {
        ForAtRuleSupports,
        AllowBareDeclarationAndGeneralEnclosed,
    };

    static SupportsResult supportsCondition(CSSParserTokenRange, CSSParserImpl&, ParsingMode, CSSParserEnum::IsNestedContext);

private:
    CSSSupportsParser(CSSParserImpl& parser, CSSParserEnum::IsNestedContext isNestedContext = CSSParserEnum::IsNestedContext::No)
        : m_parser(parser)
        , m_isNestedContext(isNestedContext)
    { }

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

    // https://drafts.csswg.org/css-conditional-5/#typedef-supports-font-format-fn
    SupportsResult consumeSupportsFontFormatFunction(CSSParserTokenRange&);
    // https://drafts.csswg.org/css-conditional-5/#typedef-supports-font-tech-fn
    SupportsResult consumeSupportsFontTechFunction(CSSParserTokenRange&);

    SupportsResult consumeConditionInParenthesis(CSSParserTokenRange&, CSSParserTokenType);

    CSSParserImpl& m_parser;
    CSSParserEnum::IsNestedContext m_isNestedContext;
};

} // namespace WebCore
