// Copyright 2016 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:
//
//    * 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.
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// contributors may be used to endorse or promote products derived from
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//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#pragma once

#include "CSSFunctionValue.h"
#include "CSSParserContext.h"
#include "CSSParserTokenRange.h"
#include "CSSPrimitiveValue.h"
#include "CSSShadowValue.h"
#include "CSSValuePool.h"
#include "Length.h" // For ValueRange
#include <wtf/OptionSet.h>

namespace WebCore {

// When these functions are successful, they will consume all the relevant
// tokens from the range and also consume any whitespace which follows. When
// the start of the range doesn't match the type we're looking for, the range
// will not be modified.
namespace CSSPropertyParserHelpers {

// FIXME: These should probably just be consumeComma and consumeSlash.
bool consumeCommaIncludingWhitespace(CSSParserTokenRange&);
bool consumeSlashIncludingWhitespace(CSSParserTokenRange&);
// consumeFunction expects the range starts with a FunctionToken.
CSSParserTokenRange consumeFunction(CSSParserTokenRange&);

enum class UnitlessQuirk { Allow, Forbid };
enum class AllowXResolutionUnit { Allow, Forbid };

RefPtr<CSSPrimitiveValue> consumeInteger(CSSParserTokenRange&, double minimumValue = -std::numeric_limits<double>::max());
RefPtr<CSSPrimitiveValue> consumePositiveInteger(CSSParserTokenRange&);
bool consumeNumberRaw(CSSParserTokenRange&, double& result);
RefPtr<CSSPrimitiveValue> consumeNumber(CSSParserTokenRange&, ValueRange);
RefPtr<CSSPrimitiveValue> consumeFontWeightNumber(CSSParserTokenRange&);
RefPtr<CSSPrimitiveValue> consumeLength(CSSParserTokenRange&, CSSParserMode, ValueRange, UnitlessQuirk = UnitlessQuirk::Forbid);
RefPtr<CSSPrimitiveValue> consumePercent(CSSParserTokenRange&, ValueRange);
RefPtr<CSSPrimitiveValue> consumeLengthOrPercent(CSSParserTokenRange&, CSSParserMode, ValueRange, UnitlessQuirk = UnitlessQuirk::Forbid);
RefPtr<CSSPrimitiveValue> consumeAngle(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk = UnitlessQuirk::Forbid);
RefPtr<CSSPrimitiveValue> consumeTime(CSSParserTokenRange&, CSSParserMode, ValueRange, UnitlessQuirk = UnitlessQuirk::Forbid);
RefPtr<CSSPrimitiveValue> consumeResolution(CSSParserTokenRange&, AllowXResolutionUnit = AllowXResolutionUnit::Forbid);

RefPtr<CSSPrimitiveValue> consumeIdent(CSSParserTokenRange&);
RefPtr<CSSPrimitiveValue> consumeIdentRange(CSSParserTokenRange&, CSSValueID lower, CSSValueID upper);
template<CSSValueID, CSSValueID...> inline bool identMatches(CSSValueID id);
template<CSSValueID... allowedIdents> RefPtr<CSSPrimitiveValue> consumeIdent(CSSParserTokenRange&);

RefPtr<CSSPrimitiveValue> consumeCustomIdent(CSSParserTokenRange&);
RefPtr<CSSPrimitiveValue> consumeString(CSSParserTokenRange&);
StringView consumeUrlAsStringView(CSSParserTokenRange&);
RefPtr<CSSPrimitiveValue> consumeUrl(CSSParserTokenRange&);

RefPtr<CSSPrimitiveValue> consumeColor(CSSParserTokenRange&, CSSParserMode, bool acceptQuirkyColors = false);

enum class PositionSyntax {
    Position, // <position>
    BackgroundPosition // <bg-position>
};

RefPtr<CSSPrimitiveValue> consumePosition(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk, PositionSyntax);
bool consumePosition(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk, PositionSyntax, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY);
bool consumeOneOrTwoValuedPosition(CSSParserTokenRange&, CSSParserMode, UnitlessQuirk, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY);

enum class AllowedImageType : uint8_t {
    URLFunction = 1 << 0,
    RawStringAsURL = 1 << 1,
    ImageSet = 1 << 2,
    GeneratedImage = 1 << 3
};

RefPtr<CSSValue> consumeImage(CSSParserTokenRange&, CSSParserContext, OptionSet<AllowedImageType> = { AllowedImageType::URLFunction, AllowedImageType::ImageSet, AllowedImageType::GeneratedImage });

RefPtr<CSSValue> consumeImageOrNone(CSSParserTokenRange&, CSSParserContext);

enum class AllowedFilterFunctions {
    PixelFilters,
    ColorFilters
};

RefPtr<CSSValue> consumeFilter(CSSParserTokenRange&, const CSSParserContext&, AllowedFilterFunctions);
RefPtr<CSSShadowValue> consumeSingleShadow(CSSParserTokenRange&, CSSParserMode, bool allowInset, bool allowSpread);

// Template implementations are at the bottom of the file for readability.

template<typename... emptyBaseCase> inline bool identMatches(CSSValueID) { return false; }
template<CSSValueID head, CSSValueID... tail> inline bool identMatches(CSSValueID id)
{
    return id == head || identMatches<tail...>(id);
}

template<CSSValueID... names> RefPtr<CSSPrimitiveValue> consumeIdent(CSSParserTokenRange& range)
{
    if (range.peek().type() != IdentToken || !identMatches<names...>(range.peek().id()))
        return nullptr;
    return CSSValuePool::singleton().createIdentifierValue(range.consumeIncludingWhitespace().id());
}

static inline bool isCSSWideKeyword(const CSSValueID& id)
{
    return id == CSSValueInitial || id == CSSValueInherit || id == CSSValueUnset || id == CSSValueRevert || id == CSSValueDefault;
}

} // namespace CSSPropertyParserHelpers

} // namespace WebCore