// Copyright 2014 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
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// 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 "CSSParserMode.h"
#include "CSSParserTokenRange.h"
#include "CSSProperty.h"
#include "CSSPropertyNames.h"
#include "CSSPropertySourceData.h"
#include "StyleRule.h"

#include <memory>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

class CSSParserObserver;
class CSSParserObserverWrapper;
class CSSSelectorList;
class StyleKeyframe;
class StyleRule;
class StyleRuleBase;
class StyleRuleCharset;
class StyleRuleFontFace;
class StyleRuleImport;
class StyleRuleKeyframes;
class StyleRuleMedia;
class StyleRuleNamespace;
class StyleRulePage;
class StyleRuleSupports;
class StyleRuleViewport;
class StyleSheetContents;
class ImmutableStyleProperties;
class Element;
class MutableStyleProperties;

class CSSParserImpl {
    WTF_MAKE_NONCOPYABLE(CSSParserImpl);
public:
    CSSParserImpl(const CSSParserContext&, StyleSheetContents* = nullptr);

    enum AllowedRulesType {
        // As per css-syntax, css-cascade and css-namespaces, @charset rules
        // must come first, followed by @import then @namespace.
        // AllowImportRules actually means we allow @import and any rules thay
        // may follow it, i.e. @namespace rules and regular rules.
        // AllowCharsetRules and AllowNamespaceRules behave similarly.
        AllowCharsetRules,
        AllowImportRules,
        AllowNamespaceRules,
        RegularRules,
        KeyframeRules,
        ApplyRules, // For @apply inside style rules
        NoRules, // For parsing at-rules inside declaration lists
    };

    static bool parseValue(MutableStyleProperties*, CSSPropertyID, const String&, bool important, const CSSParserContext&);
    static bool parseVariableValue(MutableStyleProperties*, const AtomicString& propertyName, const String&, bool important, const CSSParserContext&);
    static Ref<ImmutableStyleProperties> parseInlineStyleDeclaration(const String&, Element*);
    static bool parseDeclarationList(MutableStyleProperties*, const String&, const CSSParserContext&);
    static RefPtr<StyleRuleBase> parseRule(const String&, const CSSParserContext&, StyleSheetContents*, AllowedRulesType);
    static void parseStyleSheet(const String&, const CSSParserContext&, StyleSheetContents*);
    static CSSSelectorList parsePageSelector(CSSParserTokenRange, StyleSheetContents*);

    static RefPtr<ImmutableStyleProperties> parseCustomPropertySet(CSSParserTokenRange);

    static std::unique_ptr<Vector<double>> parseKeyframeKeyList(const String&);

    bool supportsDeclaration(CSSParserTokenRange&);

    static void parseDeclarationListForInspector(const String&, const CSSParserContext&, CSSParserObserver&);
    static void parseStyleSheetForInspector(const String&, const CSSParserContext&, StyleSheetContents*, CSSParserObserver&);

private:
    enum RuleListType {
        TopLevelRuleList,
        RegularRuleList,
        KeyframesRuleList
    };

    // Returns whether the first encountered rule was valid
    template<typename T>
    bool consumeRuleList(CSSParserTokenRange, RuleListType, T callback);

    // These two functions update the range they're given
    RefPtr<StyleRuleBase> consumeAtRule(CSSParserTokenRange&, AllowedRulesType);
    RefPtr<StyleRuleBase> consumeQualifiedRule(CSSParserTokenRange&, AllowedRulesType);

    static RefPtr<StyleRuleCharset> consumeCharsetRule(CSSParserTokenRange prelude);
    RefPtr<StyleRuleImport> consumeImportRule(CSSParserTokenRange prelude);
    RefPtr<StyleRuleNamespace> consumeNamespaceRule(CSSParserTokenRange prelude);
    RefPtr<StyleRuleMedia> consumeMediaRule(CSSParserTokenRange prelude, CSSParserTokenRange block);
    RefPtr<StyleRuleSupports> consumeSupportsRule(CSSParserTokenRange prelude, CSSParserTokenRange block);
    RefPtr<StyleRuleViewport> consumeViewportRule(CSSParserTokenRange prelude, CSSParserTokenRange block);
    RefPtr<StyleRuleFontFace> consumeFontFaceRule(CSSParserTokenRange prelude, CSSParserTokenRange block);
    RefPtr<StyleRuleKeyframes> consumeKeyframesRule(bool webkitPrefixed, CSSParserTokenRange prelude, CSSParserTokenRange block);
    RefPtr<StyleRulePage> consumePageRule(CSSParserTokenRange prelude, CSSParserTokenRange block);
    // Updates m_parsedProperties
    
    // FIXME-NEWPARSER: Support "apply"
    // void consumeApplyRule(CSSParserTokenRange prelude);

    RefPtr<StyleKeyframe> consumeKeyframeStyleRule(CSSParserTokenRange prelude, CSSParserTokenRange block);
    RefPtr<StyleRule> consumeStyleRule(CSSParserTokenRange prelude, CSSParserTokenRange block);

    void consumeDeclarationList(CSSParserTokenRange, StyleRule::Type);
    void consumeDeclaration(CSSParserTokenRange, StyleRule::Type);
    void consumeDeclarationValue(CSSParserTokenRange, CSSPropertyID, bool important, StyleRule::Type);
    void consumeVariableValue(CSSParserTokenRange, const AtomicString& propertyName, bool important);

    static std::unique_ptr<Vector<double>> consumeKeyframeKeyList(CSSParserTokenRange);

    // FIXME: Can we build StylePropertySets directly?
    // FIXME: Investigate using a smaller inline buffer
    ParsedPropertyVector m_parsedProperties;
    const CSSParserContext& m_context;

    RefPtr<StyleSheetContents> m_styleSheet;

    // For the inspector
    CSSParserObserverWrapper* m_observerWrapper;
};

} // namespace WebCore