/*
 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
 * Copyright (C) 2012-2020 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:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “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 HOLDER 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

namespace WebCore {

// Must not grow beyond 3 bits, due to packing in StyleProperties.
enum CSSParserMode {
    HTMLStandardMode,
    HTMLQuirksMode,
    // SVG attributes are parsed in quirks mode but rules differ slightly.
    SVGAttributeMode,
    // @viewport rules are parsed in standards mode but CSSOM modifications (via StylePropertySet)
    // must call parseViewportProperties so needs a special mode.
    CSSViewportRuleMode,
    // User agent stylesheets are parsed in standards mode but also allows internal properties and values.
    UASheetMode,
    // WebVTT places limitations on external resources.
    WebVTTMode
};

inline bool isQuirksModeBehavior(CSSParserMode mode)
{
    return mode == HTMLQuirksMode;
}

inline bool isUASheetBehavior(CSSParserMode mode)
{
    return mode == UASheetMode;
}

inline bool isUnitlessValueParsingEnabledForMode(CSSParserMode mode)
{
    return mode == SVGAttributeMode;
}

inline bool isCSSViewportParsingEnabledForMode(CSSParserMode mode)
{
    return mode == CSSViewportRuleMode;
}

// FIXME-NEWPARSER: Next two functions should be removed eventually.
inline CSSParserMode strictToCSSParserMode(bool inStrictMode)
{
    return inStrictMode ? HTMLStandardMode : HTMLQuirksMode;
}

inline bool isStrictParserMode(CSSParserMode cssParserMode)
{
    switch (cssParserMode) {
    case UASheetMode:
    case HTMLStandardMode:
    case SVGAttributeMode:
    case WebVTTMode:
        return true;
    case HTMLQuirksMode:
    case CSSViewportRuleMode:
        return false;
    }
    ASSERT_NOT_REACHED();
    return false;
}

} // namespace WebCore