text: /*
   * Copyright (C) 2010 Google Inc. All rights reserved.
   * Copyright (C) 2013 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:
   *
   *     * 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.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "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
   * OWNER OR CONTRIBUTORS 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 EditingStyle_h
  #define EditingStyle_h
  
  #include "CSSPropertyNames.h"
  #include "CSSValueKeywords.h"
  #include "WritingDirection.h"
  #include <wtf/Forward.h>
  #include <wtf/RefCounted.h>
  #include <wtf/RefPtr.h>
  #include <wtf/TriState.h>
  #include <wtf/Vector.h>
  #include <wtf/text/WTFString.h>
  
  namespace WebCore {
  
  class CSSStyleDeclaration;
  class CSSComputedStyleDeclaration;
  class CSSPrimitiveValue;
  class CSSValue;
  class Document;
  class Element;
  class HTMLElement;
  class MutableStylePropertySet;
  class Node;
  class Position;
  class QualifiedName;
  class RenderStyle;
  class StylePropertySet;
  class StyledElement;
  class VisibleSelection;
  
  class EditingStyle : public RefCounted<EditingStyle> {
  public:
  
      enum PropertiesToInclude { AllProperties, OnlyEditingInheritableProperties, EditingPropertiesInEffect };
  
      enum ShouldPreserveWritingDirection { PreserveWritingDirection, DoNotPreserveWritingDirection };
      enum ShouldExtractMatchingStyle { ExtractMatchingStyle, DoNotExtractMatchingStyle };
      static float NoFontDelta;
  
      static PassRefPtr<EditingStyle> create()
      {
          return adoptRef(new EditingStyle());
      }
  
      static PassRefPtr<EditingStyle> create(Node* node, PropertiesToInclude propertiesToInclude = OnlyEditingInheritableProperties)
      {
          return adoptRef(new EditingStyle(node, propertiesToInclude));
      }
  
      static PassRefPtr<EditingStyle> create(const Position& position, PropertiesToInclude propertiesToInclude = OnlyEditingInheritableProperties)
      {
          return adoptRef(new EditingStyle(position, propertiesToInclude));
      }
  
      static PassRefPtr<EditingStyle> create(const StylePropertySet* style)
      {
          return adoptRef(new EditingStyle(style));
      }
  
      static PassRefPtr<EditingStyle> create(CSSPropertyID propertyID, const String& value)
      {
          return adoptRef(new EditingStyle(propertyID, value));
      }
  
      ~EditingStyle();
  
      MutableStylePropertySet* style() { return m_mutableStyle.get(); }
      bool textDirection(WritingDirection&) const;
      bool isEmpty() const;
      void setStyle(PassRefPtr<MutableStylePropertySet>);
      void overrideWithStyle(const StylePropertySet*);
      void clear();
      PassRefPtr<EditingStyle> copy() const;
      PassRefPtr<EditingStyle> extractAndRemoveBlockProperties();
      PassRefPtr<EditingStyle> extractAndRemoveTextDirection();
      void removeBlockProperties();
      void removeStyleAddedByNode(Node*);
      void removeStyleConflictingWithStyleOfNode(Node*);
      void collapseTextDecorationProperties();
      enum ShouldIgnoreTextOnlyProperties { IgnoreTextOnlyProperties, DoNotIgnoreTextOnlyProperties };
      TriState triStateOfStyle(EditingStyle*) const;
      TriState triStateOfStyle(const VisibleSelection&) const;
      bool conflictsWithInlineStyleOfElement(StyledElement* element) const { return conflictsWithInlineStyleOfElement(element, 0, 0); }
      bool conflictsWithInlineStyleOfElement(StyledElement* element, EditingStyle* extractedStyle, Vector<CSSPropertyID>& conflictingProperties) const
      {
          return conflictsWithInlineStyleOfElement(element, extractedStyle, &conflictingProperties);
      }
      bool conflictsWithImplicitStyleOfElement(HTMLElement*, EditingStyle* extractedStyle = 0, ShouldExtractMatchingStyle = DoNotExtractMatchingStyle) const;
      bool conflictsWithImplicitStyleOfAttributes(HTMLElement*) const;
      bool extractConflictingImplicitStyleOfAttributes(HTMLElement*, ShouldPreserveWritingDirection, EditingStyle* extractedStyle,
              Vector<QualifiedName>& conflictingAttributes, ShouldExtractMatchingStyle) const;
      bool styleIsPresentInComputedStyleOfNode(Node*) const;
  
      static bool elementIsStyledSpanOrHTMLEquivalent(const HTMLElement*);
  
      void prepareToApplyAt(const Position&, ShouldPreserveWritingDirection = DoNotPreserveWritingDirection);
      void mergeTypingStyle(Document*);
      enum CSSPropertyOverrideMode { OverrideValues, DoNotOverrideValues };
      void mergeInlineStyleOfElement(StyledElement*, CSSPropertyOverrideMode, PropertiesToInclude = AllProperties);
      static PassRefPtr<EditingStyle> wrappingStyleForSerialization(Node* context, bool shouldAnnotate);
      void mergeStyleFromRules(StyledElement*);
      void mergeStyleFromRulesForSerialization(StyledElement*);
      void removeStyleFromRulesAndContext(StyledElement*, Node* context);
      void removePropertiesInElementDefaultStyle(Element*);
      void forceInline();
      int legacyFontSize(Document*) const;
  
      float fontSizeDelta() const { return m_fontSizeDelta; }
      bool hasFontSizeDelta() const { return m_fontSizeDelta != NoFontDelta; }
      bool shouldUseFixedDefaultFontSize() const { return m_shouldUseFixedDefaultFontSize; }
  
      static PassRefPtr<EditingStyle> styleAtSelectionStart(const VisibleSelection&, bool shouldUseBackgroundColorInEffect = false);
      static WritingDirection textDirectionForSelection(const VisibleSelection&, EditingStyle* typingStyle, bool& hasNestedOrMultipleEmbeddings);
  private:
      EditingStyle();
      EditingStyle(Node*, PropertiesToInclude);
      EditingStyle(const Position&, PropertiesToInclude);
      explicit EditingStyle(const StylePropertySet*);
      EditingStyle(CSSPropertyID, const String& value);
      void init(Node*, PropertiesToInclude);
      void removeTextFillAndStrokeColorsIfNeeded(RenderStyle*);
      void setProperty(CSSPropertyID, const String& value, bool important = false);
      void extractFontSizeDelta();
      template<typename T>
      TriState triStateOfStyle(T* styleToCompare, ShouldIgnoreTextOnlyProperties) const;
      bool conflictsWithInlineStyleOfElement(StyledElement*, EditingStyle* extractedStyle, Vector<CSSPropertyID>* conflictingProperties) const;
      void mergeInlineAndImplicitStyleOfElement(StyledElement*, CSSPropertyOverrideMode, PropertiesToInclude);
      void mergeStyle(const StylePropertySet*, CSSPropertyOverrideMode);
  
      RefPtr<MutableStylePropertySet> m_mutableStyle;
      bool m_shouldUseFixedDefaultFontSize;
      float m_fontSizeDelta;
  
      friend class HTMLElementEquivalent;
      friend class HTMLAttributeEquivalent;
  };
  
  class StyleChange {
  public:
      StyleChange()
          : m_applyBold(false)
          , m_applyItalic(false)
          , m_applyUnderline(false)
          , m_applyLineThrough(false)
          , m_applySubscript(false)
          , m_applySuperscript(false)
      { }
  
      StyleChange(EditingStyle*, const Position&);
  
      String cssStyle() const { return m_cssStyle; }
      bool applyBold() const { return m_applyBold; }
      bool applyItalic() const { return m_applyItalic; }
      bool applyUnderline() const { return m_applyUnderline; }
      bool applyLineThrough() const { return m_applyLineThrough; }
      bool applySubscript() const { return m_applySubscript; }
      bool applySuperscript() const { return m_applySuperscript; }
      bool applyFontColor() const { return m_applyFontColor.length() > 0; }
      bool applyFontFace() const { return m_applyFontFace.length() > 0; }
      bool applyFontSize() const { return m_applyFontSize.length() > 0; }
  
      String fontColor() { return m_applyFontColor; }
      String fontFace() { return m_applyFontFace; }
      String fontSize() { return m_applyFontSize; }
  
      bool operator==(const StyleChange& other)
      {
          return m_cssStyle == other.m_cssStyle
              && m_applyBold == other.m_applyBold
              && m_applyItalic == other.m_applyItalic
              && m_applyUnderline == other.m_applyUnderline
              && m_applyLineThrough == other.m_applyLineThrough
              && m_applySubscript == other.m_applySubscript
              && m_applySuperscript == other.m_applySuperscript
              && m_applyFontColor == other.m_applyFontColor
              && m_applyFontFace == other.m_applyFontFace
              && m_applyFontSize == other.m_applyFontSize;
      }
      bool operator!=(const StyleChange& other)
      {
          return !(*this == other);
      }
  private:
      void extractTextStyles(Document*, MutableStylePropertySet*, bool shouldUseFixedFontDefaultSize);
  
      String m_cssStyle;
      bool m_applyBold;
      bool m_applyItalic;
      bool m_applyUnderline;
      bool m_applyLineThrough;
      bool m_applySubscript;
      bool m_applySuperscript;
      String m_applyFontColor;
      String m_applyFontFace;
      String m_applyFontSize;
  };
  
  } // namespace WebCore
  
  #endif // EditingStyle_h
  