Source/WebCore/css/parser/CSSSelectorParser.h

// Copyright 2014 The Chromium Authors. All rights reserved.
// Copyright (C) 2016-2020 Apple Inc. All rights reserved.
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#pragma once

#include "CSSParserContext.h"
#include "CSSParserSelector.h"
#include "CSSParserTokenRange.h"
#include "CSSSelectorList.h"
#include "StyleSheetContents.h"

namespace WebCore {

class CSSParserTokenRange;
class CSSSelectorList;
class StyleSheetContents;

struct CSSParserContext;

class CSSSelectorParser {
public:
    CSSSelectorParser(const CSSParserContext&, StyleSheetContents*);

    CSSSelectorList consumeComplexSelectorList(CSSParserTokenRange&);

    static bool supportsComplexSelector(CSSParserTokenRange, const CSSParserContext&);

private:
    template<typename ConsumeSelector> CSSSelectorList consumeForgivingSelectorList(CSSParserTokenRange&, ConsumeSelector&&);

    CSSSelectorList consumeForgivingComplexSelectorList(CSSParserTokenRange&);
    CSSSelectorList consumeForgivingRelativeSelectorList(CSSParserTokenRange&);
    CSSSelectorList consumeCompoundSelectorList(CSSParserTokenRange&);

    std::unique_ptr<CSSParserSelector> consumeComplexSelector(CSSParserTokenRange&);
    std::unique_ptr<CSSParserSelector> consumeCompoundSelector(CSSParserTokenRange&);
    std::unique_ptr<CSSParserSelector> consumeRelativeSelector(CSSParserTokenRange&);

    // This doesn't include element names, since they're handled specially.
    std::unique_ptr<CSSParserSelector> consumeSimpleSelector(CSSParserTokenRange&);

    bool consumeName(CSSParserTokenRange&, AtomString& name, AtomString& namespacePrefix);

    // These will return nullptr when the selector is invalid.
    std::unique_ptr<CSSParserSelector> consumeId(CSSParserTokenRange&);
    std::unique_ptr<CSSParserSelector> consumeClass(CSSParserTokenRange&);
    std::unique_ptr<CSSParserSelector> consumePseudo(CSSParserTokenRange&);
    std::unique_ptr<CSSParserSelector> consumeAttribute(CSSParserTokenRange&);

    CSSSelector::RelationType consumeCombinator(CSSParserTokenRange&);
    CSSSelector::Match consumeAttributeMatch(CSSParserTokenRange&);
    CSSSelector::AttributeMatchType consumeAttributeFlags(CSSParserTokenRange&);

    const AtomString& defaultNamespace() const;
    const AtomString& determineNamespace(const AtomString& prefix);
    void prependTypeSelectorIfNeeded(const AtomString& namespacePrefix, const AtomString& elementName, CSSParserSelector&);
    static std::unique_ptr<CSSParserSelector> splitCompoundAtImplicitShadowCrossingCombinator(std::unique_ptr<CSSParserSelector> compoundSelector, const CSSParserContext&);
    static bool containsUnknownWebKitPseudoElements(const CSSSelector& complexSelector);

    class DisallowPseudoElementsScope;

    const CSSParserContext& m_context;
    const RefPtr<StyleSheetContents> m_styleSheet;
    bool m_failedParsing { false };
    bool m_disallowPseudoElements { false };
    bool m_resistDefaultNamespace { false };
    bool m_ignoreDefaultNamespace { false };
    std::optional<CSSSelector::PseudoElementType> m_precedingPseudoElement;
};



std::optional<CSSSelectorList> parseCSSSelector(CSSParserTokenRange, const CSSParserContext&, StyleSheetContents*);

} // namespace WebCore