// 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
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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
// OWNER OR CONTRIBUTORS 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.

#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
