text: /*
   * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
   * Copyright (C) 2012 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.
   */
  
  #ifndef CSSParserMode_h
  #define CSSParserMode_h
  
  #include "core/CoreExport.h"
  #include "core/fetch/ResourceLoaderOptions.h"
  #include "platform/weborigin/KURL.h"
  #include "platform/weborigin/Referrer.h"
  
  namespace blink {
  
  class Document;
  
  // Must not grow beyond 3 bits, due to packing in StylePropertySet.
  enum CSSParserMode {
    HTMLStandardMode,
    HTMLQuirksMode,
    // HTML attributes are parsed in quirks mode but also allows internal
    // properties and values.
    HTMLAttributeMode,
    // SVG attributes are parsed in quirks mode but rules differ slightly.
    SVGAttributeMode,
    // @viewport/@font-face rules are specially tagged in StylePropertySet so
    // CSSOM modifications don't treat them as style rules.
    CSSViewportRuleMode,
    CSSFontFaceRuleMode,
    // User agent stylesheets are parsed in standards mode but also allows
    // internal properties and values.
    UASheetMode
  };
  
  inline bool isQuirksModeBehavior(CSSParserMode mode) {
    return mode == HTMLQuirksMode;  // || mode == HTMLAttributeMode;
  }
  
  inline bool isUASheetBehavior(CSSParserMode mode) {
    return mode == UASheetMode;
  }
  
  inline bool isUnitLessLengthParsingEnabledForMode(CSSParserMode mode) {
    return mode == HTMLAttributeMode || mode == SVGAttributeMode;
  }
  
  inline bool isCSSViewportParsingEnabledForMode(CSSParserMode mode) {
    return mode == CSSViewportRuleMode;
  }
  
  inline bool isUseCounterEnabledForMode(CSSParserMode mode) {
    // We don't count the UA style sheet in our statistics.
    return mode != UASheetMode;
  }
  
  class UseCounter;
  
  class CORE_EXPORT CSSParserContext {
    USING_FAST_MALLOC(CSSParserContext);
  
   public:
    // https://drafts.csswg.org/selectors/#profiles
    enum SelectorProfile { DynamicProfile, StaticProfile };
  
    CSSParserContext(CSSParserMode,
                     UseCounter*,
                     SelectorProfile = DynamicProfile);
    // FIXME: We shouldn't need the UseCounter argument as we could infer it from
    // the Document but some callers want to disable use counting (e.g. the
    // WebInspector).
    CSSParserContext(const Document&,
                     UseCounter*,
                     const KURL& baseURL = KURL(),
                     const String& charset = emptyString(),
                     SelectorProfile = DynamicProfile);
    // FIXME: This constructor shouldn't exist if we properly piped the UseCounter
    // through the CSS subsystem. Currently the UseCounter life time is too crazy
    // and we need a way to override it.
    CSSParserContext(const CSSParserContext&, UseCounter*);
  
    bool operator==(const CSSParserContext&) const;
    bool operator!=(const CSSParserContext& other) const {
      return !(*this == other);
    }
  
    CSSParserMode mode() const { return m_mode; }
    CSSParserMode matchMode() const { return m_matchMode; }
    const KURL& baseURL() const { return m_baseURL; }
    const String& charset() const { return m_charset; }
    const Referrer& referrer() const { return m_referrer; }
    bool isHTMLDocument() const { return m_isHTMLDocument; }
    bool isDynamicProfile() const { return m_profile == DynamicProfile; }
    bool isStaticProfile() const { return m_profile == StaticProfile; }
  
    // This quirk is to maintain compatibility with Android apps built on
    // the Android SDK prior to and including version 18. Presumably, this
    // can be removed any time after 2015. See http://crbug.com/277157.
    bool useLegacyBackgroundSizeShorthandBehavior() const {
      return m_useLegacyBackgroundSizeShorthandBehavior;
    }
  
    // FIXME: These setters shouldn't exist, however the current lifetime of
    // CSSParserContext is not well understood and thus we sometimes need to
    // override these fields.
    void setMode(CSSParserMode mode) { m_mode = mode; }
    void setBaseURL(const KURL& baseURL) { m_baseURL = baseURL; }
    void setCharset(const String& charset) { m_charset = charset; }
    void setReferrer(const Referrer& referrer) { m_referrer = referrer; }
  
    KURL completeURL(const String& url) const;
  
    // This may return nullptr if counting is disabled.
    // See comments on constructors.
    UseCounter* useCounter() const { return m_useCounter; }
  
    ContentSecurityPolicyDisposition shouldCheckContentSecurityPolicy() const {
      return m_shouldCheckContentSecurityPolicy;
    }
  
   private:
    KURL m_baseURL;
    String m_charset;
    CSSParserMode m_mode;
    CSSParserMode m_matchMode;
    SelectorProfile m_profile = DynamicProfile;
    Referrer m_referrer;
    bool m_isHTMLDocument;
    bool m_useLegacyBackgroundSizeShorthandBehavior;
    ContentSecurityPolicyDisposition m_shouldCheckContentSecurityPolicy;
  
    UseCounter* m_useCounter;
  };
  
  CORE_EXPORT const CSSParserContext& strictCSSParserContext();
  
  }  // namespace blink
  
  #endif  // CSSParserMode_h
  