Implemented the reporting of text style and language information on Windows.

content/browser/accessibility/browser_accessibility_win.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <oleacc.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <UIAutomationCore.h>
 
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "base/containers/hash_tables.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "content/browser/accessibility/browser_accessibility.h"
 #include "content/common/content_export.h"
 #include "third_party/iaccessible2/ia2_api_all.h"
 #include "third_party/isimpledom/ISimpleDOMDocument.h"
 #include "third_party/isimpledom/ISimpleDOMNode.h"
 #include "third_party/isimpledom/ISimpleDOMText.h"
 
 namespace ui {
@@ skipping 688 matching lines @@
   int32_t ia_state() const { return win_attributes_->ia_state; }
   const base::string16& role_name() const { return win_attributes_->role_name; }
   int32_t ia2_role() const { return win_attributes_->ia2_role; }
   int32_t ia2_state() const { return win_attributes_->ia2_state; }
   const std::vector<base::string16>& ia2_attributes() const {
     return win_attributes_->ia2_attributes;
   }
   base::string16 name() const { return win_attributes_->name; }
   base::string16 description() const { return win_attributes_->description; }
   base::string16 value() const { return win_attributes_->value; }
+  const base::hash_map<int, std::vector<base::string16>>&
+  offset_to_text_attributes() const {
+    return win_attributes_->offset_to_text_attributes;
+  }
   std::map<int32_t, int32_t>& hyperlink_offset_to_index() const {
     return win_attributes_->hyperlink_offset_to_index;
   }
   std::vector<int32_t>& hyperlinks() const {
     return win_attributes_->hyperlinks;
   }
 
  private:
+  // Returns the IA2 text attributes for this object.
+  std::vector<base::string16> ComputeTextAttributes() const;
+
   // Add one to the reference count and return the same object. Always
   // use this method when returning a BrowserAccessibilityWin object as
   // an output parameter to a COM interface, never use it otherwise.
   BrowserAccessibilityWin* NewReference();
 
   // Many MSAA methods take a var_id parameter indicating that the operation
   // should be performed on a particular child ID, rather than this object.
   // This method tries to figure out the target object from |var_id| and
   // returns a pointer to the target object if it exists, otherwise NULL.
   // Does not return a new reference.
@@ skipping 35 matching lines @@
 
   //
   // Helper methods for IA2 hyperlinks.
   //
   // Hyperlink is an IA2 misnomer. It refers to objects embedded within other
   // objects, such as a numbered list within a contenteditable div.
   // Also, in IA2, text that includes embedded objects is called hypertext.
 
   // Returns true if the current object is an IA2 hyperlink.
   bool IsHyperlink() const;
+  // Returns the hyperlink at the given text position, or nullptr if no
+  // hyperlink can be found.
+  BrowserAccessibilityWin* GetHyperlinkFromHypertextOffset(int offset) const;
 
   // Functions for retrieving offsets for hyperlinks and hypertext.
   // Return -1 in case of failure.
   int32_t GetHyperlinkIndexFromChild(
       const BrowserAccessibilityWin& child) const;
   int32_t GetHypertextOffsetFromHyperlinkIndex(int32_t hyperlink_index) const;
   int32_t GetHypertextOffsetFromChild(
       const BrowserAccessibilityWin& child) const;
   int32_t GetHypertextOffsetFromDescendant(
       const BrowserAccessibilityWin& descendant) const;
@@ skipping 26 matching lines @@
   void GetSelectionOffsets(int* selection_start, int* selection_end) const;
 
   // Get the value text, which might come from the floating-point
   // value for some roles.
   base::string16 GetValueText();
 
   bool IsSameHypertextCharacter(size_t old_char_index, size_t new_char_index);
   void ComputeHypertextRemovedAndInserted(
       int* start, int* old_len, int* new_len);
 
+  // Computes and caches the IA2 text style attributes for the text and other
+  // embedded child objects.
+  void MayBeComputeStyles();
+
   // If offset is a member of IA2TextSpecialOffsets this function updates the
   // value of offset and returns, otherwise offset remains unchanged.
   void HandleSpecialTextOffset(const base::string16& text, LONG* offset);
 
   // Convert from a IA2TextBoundaryType to a ui::TextBoundaryType.
   ui::TextBoundaryType IA2TextBoundaryToTextBoundary(IA2TextBoundaryType type);
 
   // Search forwards (direction == 1) or backwards (direction == -1)
   // from the given offset until the given boundary is found, and
   // return the offset of that boundary.
   LONG FindBoundary(const base::string16& text,
                     IA2TextBoundaryType ia2_boundary,
                     LONG start_offset,
                     ui::TextBoundaryDirection direction);
 
-  // Return a pointer to the object corresponding to the given id,
-  // does not make a new reference.
-  BrowserAccessibilityWin* GetFromID(int32_t id);
+  // Searches forward from the given offset until the start of the next style
+  // is found, or searches backward from the given offset until the start of the
+  // current style is found.
+  LONG FindStartOfStyle(LONG start_offset,
+                        ui::TextBoundaryDirection direction) const;
+
+  // ID refers to the node ID in the current tree, not the globally unique ID.
+  // TODO(nektar): Could we use globally unique IDs everywhere?
+  // TODO(nektar): Rename this function to GetFromNodeID.
+  BrowserAccessibilityWin* GetFromID(int32_t id) const;
 
   // Returns true if this is a list box option with a parent of type list box,
   // or a menu list option with a parent of type menu list popup.
   bool IsListBoxOptionOrMenuListOption();
 
-  // Updates object attributes of IA2 with html attributes.
-  void UpdateRequiredAttributes();
-
   // Given an int list attribute containing the ids of related elements,
   // add a new IAccessibleRelation for this object with the given type name.
   void AddRelations(ui::AXIntListAttribute src_attr,
                     const base::string16& iaccessiblerelation_type);
 
+  // Updates object attributes of IA2 with html attributes.
+  void UpdateRequiredAttributes();
+
+  // Updates the IA2 text style attributes.
+  void UpdateTextAttributes();
+
   struct WinAttributes {
     WinAttributes();
     ~WinAttributes();
 
     // IAccessible role and state.
     int32_t ia_role;
     int32_t ia_state;
     base::string16 role_name;
 
     // IAccessible name, description, help, value.
     base::string16 name;
     base::string16 description;
     base::string16 value;
 
     // IAccessible2 role and state.
     int32_t ia2_role;
     int32_t ia2_state;
 
     // IAccessible2 attributes.
     std::vector<base::string16> ia2_attributes;
 
     // Hypertext.
     base::string16 hypertext;
 
+    // Maps each style span to its start offset in hypertext.
+    base::hash_map<int, std::vector<base::string16>> offset_to_text_attributes;
+
     // Maps the |hypertext_| embedded character offset to an index in
     // |hyperlinks_|.
     std::map<int32_t, int32_t> hyperlink_offset_to_index;
 
     // The id of a BrowserAccessibilityWin for each hyperlink.
     // TODO(nektar): Replace object IDs with child indices.
     std::vector<int32_t> hyperlinks;
   };
 
   scoped_ptr<WinAttributes> win_attributes_;
@@ skipping 18 matching lines @@
 
 CONTENT_EXPORT BrowserAccessibilityWin*
 ToBrowserAccessibilityWin(BrowserAccessibility* obj);
 
 CONTENT_EXPORT const BrowserAccessibilityWin*
 ToBrowserAccessibilityWin(const BrowserAccessibility* obj);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_