Expose semantics of landmark and related roles for assitive technologies

content/renderer/accessibility/accessibility_node_serializer.cc

 // 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.
 
 #include "content/renderer/accessibility/accessibility_node_serializer.h"
 
 #include <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 106 matching lines @@
 
   if (o.isVertical())
     state |= (1 << blink::WebAXStateVertical);
 
   if (o.isVisited())
     state |= (1 << blink::WebAXStateVisited);
 
   return state;
 }
 
+std::string ConvertRole(const blink::WebAXRole role) {

[dmazzoni, 2014/01/05 05:27:38]

Let's call this GetEquivalentAriaRoleString.

+  switch (role) {
+    case blink::WebAXRoleArticle:
+      return "article";
+    case blink::WebAXRoleComplementary:
+      return "complementary";
+    case blink::WebAXRoleContentInfo:
+    case blink::WebAXRoleFooter:
+      return "contentinfo";
+    case blink::WebAXRoleBanner:
+      return "banner";
+    case blink::WebAXRoleMain:
+      return "main";
+    case blink::WebAXRoleNavigation:
+      return "navigation";
+    case blink::WebAXRoleRegion:
+      return "region";
+    default:
+      break;
+  }
+
+  return std::string();
+}
+
 }  // Anonymous namespace
 
 void SerializeAccessibilityNode(
     const WebAXObject& src,
     AccessibilityNodeData* dst) {
   dst->role = src.role();
   dst->state = ConvertState(src);
   dst->location = src.boundingBoxRect();
   dst->id = src.axID();
   std::string name = base::UTF16ToUTF8(src.title());
@@ skipping 134 matching lines @@
         for (size_t i = 0; i < src_line_breaks.size(); ++i)
           line_breaks.push_back(src_line_breaks[i]);
         dst->AddIntListAttribute(dst->ATTR_LINE_BREAKS, line_breaks);
       }
     }
 
     // ARIA role.
     if (element.hasAttribute("role")) {
       dst->AddStringAttribute(dst->ATTR_ROLE,
                               base::UTF16ToUTF8(element.getAttribute("role")));
+    } else {
+      std::string role = ConvertRole(src.role());
+      if (!role.empty()) {

[dmazzoni, 2014/01/05 05:27:38]

Nit: the Chromium style is to not use { } braces when both the conditional and
the body are one line each.

+        dst->AddStringAttribute(dst->ATTR_ROLE, role);
+      }
     }
 
     // Live region attributes
     live_atomic = base::UTF16ToUTF8(element.getAttribute("aria-atomic"));
     live_busy = base::UTF16ToUTF8(element.getAttribute("aria-busy"));
     live_status = base::UTF16ToUTF8(element.getAttribute("aria-live"));
     live_relevant = base::UTF16ToUTF8(element.getAttribute("aria-relevant"));
   }
 
   // Walk up the parent chain to set live region attributes of containers
@@ skipping 193 matching lines @@
   WebNode node = parent.node();
   if (!node.isNull() && node.isElementNode()) {
     WebElement element = node.to<WebElement>();
     is_iframe = (element.tagName() == base::ASCIIToUTF16("IFRAME"));
   }
 
   return (is_iframe || IsParentUnignoredOf(parent, child));
 }
 
 }  // namespace content