Fixed IAccessibleText::TextAtOffset with IA2_TEXT_BOUNDARY_WORD to return text that spans from the …

content/browser/accessibility/accessibility_win_browsertest.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 <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "net/base/escape.h"

[dmazzoni, 2014/11/17 19:06:46]

nit: sort this

 #include "base/strings/utf_string_conversions.h"
 #include "base/win/scoped_bstr.h"
 #include "base/win/scoped_comptr.h"
 #include "base/win/scoped_variant.h"
 #include "content/browser/accessibility/accessibility_mode_helper.h"
+#include "content/browser/accessibility/accessibility_tree_formatter.h"
 #include "content/browser/accessibility/accessibility_tree_formatter_utils_win.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "content/test/accessibility_browser_test_utils.h"
 #include "third_party/iaccessible2/ia2_api_all.h"
 #include "third_party/isimpledom/ISimpleDOMNode.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 
 namespace content {
 
 namespace {
 
-// Helpers --------------------------------------------------------------------
 
-base::win::ScopedComPtr<IAccessible> GetAccessibleFromResultVariant(
+const char INPUT_CONTENTS[] = "Moz/5.0 (ST 6.x; WWW33) "
+    "WebKit  \"KHTML, like\".";
+const char TEXTAREA_CONTENTS[] = "Moz/5.0 (ST 6.x; WWW33)\n"
+    "WebKit \n\"KHTML, like\".";
+const LONG CONTENTS_LENGTH = static_cast<LONG>(
+    (sizeof(INPUT_CONTENTS) - 1) / sizeof(char));
+
+
+// AccessibilityWinBrowserTest ------------------------------------------------
+
+class AccessibilityWinBrowserTest : public ContentBrowserTest {
+ public:
+  AccessibilityWinBrowserTest();
+  virtual ~AccessibilityWinBrowserTest();
+
+ protected:
+  class AccessibleChecker;
+  void LoadInitialAccessibilityTreeFromHtml(const std::string& html);
+  IAccessible* GetRendererAccessible();
+  void ExecuteScript(const std::wstring& script);
+  void SetUpTextFields(
+      base::win::ScopedComPtr<IAccessibleText>* input_text,
+      base::win::ScopedComPtr<IAccessibleText>* textarea_text);
+
+  static base::win::ScopedComPtr<IAccessible>
+  AccessibilityWinBrowserTest::GetAccessibleFromVariant(
+      IAccessible* parent,
+      VARIANT* var);
+  static HRESULT QueryIAccessible2(IAccessible* accessible,
+                                    IAccessible2** accessible2);
+  static void FindNodeInAccessibilityTree(IAccessible* node,
+                                           int32 expected_role,
+                                           const std::wstring& expected_name,
+                                           int32 depth,
+                                           bool* found);
+  static void CheckTextAtOffset(IAccessibleText* element,
+                                 LONG offset,
+                                 IA2TextBoundaryType boundary_type,
+                                 LONG expected_start_offset,
+                                 LONG expected_end_offset,
+                                 const std::wstring& expected_text);
+  static std::vector<base::win::ScopedVariant> GetAllAccessibleChildren(
+      IAccessible* element);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AccessibilityWinBrowserTest);
+};
+
+AccessibilityWinBrowserTest::AccessibilityWinBrowserTest() {
+}
+
+AccessibilityWinBrowserTest::~AccessibilityWinBrowserTest() {
+}
+
+void AccessibilityWinBrowserTest::LoadInitialAccessibilityTreeFromHtml(
+    const std::string& html) {
+  AccessibilityNotificationWaiter waiter(
+      shell(), AccessibilityModeComplete,
+      ui::AX_EVENT_LOAD_COMPLETE);
+  GURL html_data_url("data:text/html," + html);
+  NavigateToURL(shell(), html_data_url);
+  waiter.WaitForNotification();
+}
+
+// Retrieve the MSAA client accessibility object for the Render Widget Host View
+// of the selected tab.
+IAccessible* AccessibilityWinBrowserTest::GetRendererAccessible() {
+  content::WebContents* web_contents = shell()->web_contents();
+  base::string16 contents;
+  AccessibilityTreeFormatter* atf = AccessibilityTreeFormatter::Create(web_contents);

[dmazzoni, 2014/11/17 19:06:46]

Use a scoped_ptr rather than manually deleting a pointer

+  atf->FormatAccessibilityTree(&contents);
+  DLOG(INFO) << contents;
+  delete atf;
+  return web_contents->GetRenderWidgetHostView()->GetNativeViewAccessible();
+}
+
+void AccessibilityWinBrowserTest::ExecuteScript(const std::wstring& script) {
+  shell()->web_contents()->GetMainFrame()->ExecuteJavaScript(script);
+}
+
+// Loads a page with two text fields, one using the input and one the textarea
+// tags, and places the same sample text in both. Also, places the caret on the
+// last character.
+// Returns true if successful and false otherwise.

[dmazzoni, 2014/11/17 19:06:46]

nit: no longer returns a bool

+void AccessibilityWinBrowserTest::SetUpTextFields(
+    base::win::ScopedComPtr<IAccessibleText>* input_text,
+    base::win::ScopedComPtr<IAccessibleText>* textarea_text) {
+  ASSERT_NE(nullptr, input_text);
+  ASSERT_NE(nullptr, textarea_text);
+  LoadInitialAccessibilityTreeFromHtml(std::string("<!DOCTYPE html>"
+      "<html><body><form>"
+      "<label for='name'>Browser name:</label>"
+      "<input type='text' id='name' name='name' value='") +
+      net::EscapeQueryParamValue(INPUT_CONTENTS, false) + std::string(
+      "'></form><textarea rows='3' cols='60'>") +
+      net::EscapeQueryParamValue(TEXTAREA_CONTENTS, false) + std::string(
+      "</textarea></body></html>"));
+
+  // Retrieve the IAccessible interface for the web page.
+  base::win::ScopedComPtr<IAccessible> document(GetRendererAccessible());
+  std::vector<base::win::ScopedVariant> document_children =
+      GetAllAccessibleChildren(document);
+  ASSERT_EQ(2, document_children.size());
+
+  base::win::ScopedComPtr<IAccessible2> form;
+  HRESULT hr = QueryIAccessible2(GetAccessibleFromVariant(
+      document, document_children[0].AsInput()), form.Receive());
+  ASSERT_EQ(S_OK, hr);
+  std::vector<base::win::ScopedVariant> form_children =
+      GetAllAccessibleChildren(form);
+  ASSERT_EQ(2, form_children.size());
+  base::win::ScopedComPtr<IAccessible2> div;
+  hr = QueryIAccessible2(GetAccessibleFromVariant(
+      document, document_children[1].AsInput()), div.Receive());
+  ASSERT_EQ(S_OK, hr);
+  std::vector<base::win::ScopedVariant> div_children =
+      GetAllAccessibleChildren(div);
+  ASSERT_EQ(1, div_children.size());
+
+  // Find the two edit fields (simple and text area).
+  base::win::ScopedComPtr<IAccessible2> input;
+  hr = QueryIAccessible2(GetAccessibleFromVariant(
+      form, form_children[1].AsInput()), input.Receive());
+  ASSERT_EQ(S_OK, hr);
+  LONG input_role = 0;
+  hr = input->role(&input_role);
+  ASSERT_EQ(S_OK, hr);
+  ASSERT_EQ(ROLE_SYSTEM_TEXT, input_role);
+
+  base::win::ScopedComPtr<IAccessible2> textarea;
+  hr = QueryIAccessible2(GetAccessibleFromVariant(
+      div, div_children[0].AsInput()), textarea.Receive());
+  ASSERT_EQ(S_OK, hr);
+  LONG textarea_role = 0;
+  hr = textarea->role(&textarea_role);
+  ASSERT_EQ(S_OK, hr);
+  ASSERT_EQ(ROLE_SYSTEM_TEXT, input_role);
+
+  // Retrieve the IAccessibleText interface for both of the fields.
+  hr = input_text->QueryFrom(input);
+  ASSERT_EQ(S_OK, hr);
+  hr = textarea_text->QueryFrom(textarea);
+  ASSERT_EQ(S_OK, hr);
+  // Set the caret on the last character.
+  LONG caret_offset = CONTENTS_LENGTH - 1;
+  hr = (*input_text)->setCaretOffset(caret_offset);
+  ASSERT_EQ(S_OK, hr);
+  hr = (*textarea_text)->setCaretOffset(caret_offset);
+  ASSERT_EQ(S_OK, hr);
+}
+
+// Static helpers ------------------------------------------------
+
+base::win::ScopedComPtr<IAccessible>
+AccessibilityWinBrowserTest::GetAccessibleFromVariant(
     IAccessible* parent,
     VARIANT* var) {
   base::win::ScopedComPtr<IAccessible> ptr;
   switch (V_VT(var)) {
     case VT_DISPATCH: {
       IDispatch* dispatch = V_DISPATCH(var);
       if (dispatch)
         ptr.QueryFrom(dispatch);
       break;
     }
 
     case VT_I4: {
       base::win::ScopedComPtr<IDispatch> dispatch;
       HRESULT hr = parent->get_accChild(*var, dispatch.Receive());
       EXPECT_TRUE(SUCCEEDED(hr));
       if (dispatch)
         dispatch.QueryInterface(ptr.Receive());
       break;
     }
   }
   return ptr;
 }
 
-HRESULT QueryIAccessible2(IAccessible* accessible, IAccessible2** accessible2) {
-  // TODO(ctguil): For some reason querying the IAccessible2 interface from
-  // IAccessible fails.
+HRESULT AccessibilityWinBrowserTest::QueryIAccessible2(
+    IAccessible* accessible,
+    IAccessible2** accessible2) {
+  // IA2 Spec dictates that IServiceProvider should be used instead of
+  // QueryInterface when retrieving IAccessible2.
   base::win::ScopedComPtr<IServiceProvider> service_provider;
   HRESULT hr = accessible->QueryInterface(service_provider.Receive());
   return SUCCEEDED(hr) ?
       service_provider->QueryService(IID_IAccessible2, accessible2) : hr;
 }
 
 // Recursively search through all of the descendants reachable from an
 // IAccessible node and return true if we find one with the given role
 // and name.
-void RecursiveFindNodeInAccessibilityTree(IAccessible* node,
-                                          int32 expected_role,
-                                          const std::wstring& expected_name,
-                                          int32 depth,
-                                          bool* found) {
+void AccessibilityWinBrowserTest::FindNodeInAccessibilityTree(
+    IAccessible* node,
+    int32 expected_role,
+    const std::wstring& expected_name,
+    int32 depth,
+    bool* found) {
   base::win::ScopedBstr name_bstr;
   base::win::ScopedVariant childid_self(CHILDID_SELF);
   node->get_accName(childid_self, name_bstr.Receive());
   std::wstring name(name_bstr, name_bstr.Length());
   base::win::ScopedVariant role;
   node->get_accRole(childid_self, role.Receive());
   ASSERT_EQ(VT_I4, role.type());
 
   // Print the accessibility tree as we go, because if this test fails
   // on the bots, this is really helpful in figuring out why.
   for (int i = 0; i < depth; i++)
     printf("  ");
   printf("role=%s name=%s\n",
       base::WideToUTF8(IAccessibleRoleToString(V_I4(&role))).c_str(),
       base::WideToUTF8(name).c_str());
 
   if (expected_role == V_I4(&role) && expected_name == name) {
     *found = true;
     return;
   }
 
-  LONG child_count = 0;
-  HRESULT hr = node->get_accChildCount(&child_count);
-  ASSERT_EQ(S_OK, hr);
-
-  scoped_ptr<VARIANT[]> child_array(new VARIANT[child_count]);
-  LONG obtained_count = 0;
-  hr = AccessibleChildren(
-      node, 0, child_count, child_array.get(), &obtained_count);
-  ASSERT_EQ(S_OK, hr);
-  ASSERT_EQ(child_count, obtained_count);
-
-  for (int index = 0; index < obtained_count; index++) {
+  std::vector<base::win::ScopedVariant> children = GetAllAccessibleChildren(
+      node);
+  for (size_t i = 0; i < children.size(); ++i) {
     base::win::ScopedComPtr<IAccessible> child_accessible(
-        GetAccessibleFromResultVariant(node, &child_array.get()[index]));
+        GetAccessibleFromVariant(node, children[i].AsInput()));
     if (child_accessible) {
-      RecursiveFindNodeInAccessibilityTree(
+      FindNodeInAccessibilityTree(
           child_accessible.get(), expected_role, expected_name, depth + 1,
           found);
       if (*found)
         return;
     }
   }
 }
 
+// Ensures that the text and the start and end offsets retrieved using
+// get_textAtOffset match the expected values.
+void AccessibilityWinBrowserTest::CheckTextAtOffset(IAccessibleText* element,
+                                                     LONG offset,
+                                                     IA2TextBoundaryType boundary_type,
+                                                     LONG expected_start_offset,
+                                                     LONG expected_end_offset,
+                                                     const std::wstring& expected_text) {
+  testing::Message message;
+  message << "While checking for \'" << expected_text << "\' at " <<
+      expected_start_offset << '-' << expected_end_offset << '.';
+  SCOPED_TRACE(message);
 
-// AccessibilityWinBrowserTest ------------------------------------------------
-
-class AccessibilityWinBrowserTest : public ContentBrowserTest {
- public:
-  AccessibilityWinBrowserTest();
-  virtual ~AccessibilityWinBrowserTest();
-
- protected:
-  void LoadInitialAccessibilityTreeFromHtml(const std::string& html);
-  IAccessible* GetRendererAccessible();
-  void ExecuteScript(const std::wstring& script);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AccessibilityWinBrowserTest);
-};
-
-AccessibilityWinBrowserTest::AccessibilityWinBrowserTest() {
+  LONG start_offset = 0;
+  LONG end_offset = 0;
+  base::win::ScopedBstr text;
+  HRESULT hr = element->get_textAtOffset(
+      offset, boundary_type,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_OK, hr);
+  EXPECT_EQ(expected_start_offset, start_offset);
+  EXPECT_EQ(expected_end_offset, end_offset);
+  EXPECT_EQ(expected_text, std::wstring(text, text.Length()));
 }
 
-AccessibilityWinBrowserTest::~AccessibilityWinBrowserTest() {
-}
+std::vector<base::win::ScopedVariant>
+AccessibilityWinBrowserTest::GetAllAccessibleChildren(
+    IAccessible* element) {
+  LONG child_count = 0;
+  HRESULT hr = element->get_accChildCount(&child_count);
+  EXPECT_EQ(S_OK, hr);
+  if (child_count <= 0)
+      return std::vector<base::win::ScopedVariant>();
 
-void AccessibilityWinBrowserTest::LoadInitialAccessibilityTreeFromHtml(
-    const std::string& html) {
-  AccessibilityNotificationWaiter waiter(
-      shell(), AccessibilityModeComplete,
-      ui::AX_EVENT_LOAD_COMPLETE);
-  GURL html_data_url("data:text/html," + html);
-  NavigateToURL(shell(), html_data_url);
-  waiter.WaitForNotification();
-}
+  scoped_ptr<VARIANT[]> children_array(new VARIANT[child_count]);
+  LONG obtained_count = 0;
+  hr = AccessibleChildren(
+      element, 0, child_count, children_array.get(), &obtained_count);
+  EXPECT_EQ(S_OK, hr);
+  EXPECT_EQ(child_count, obtained_count);
 
-// Retrieve the MSAA client accessibility object for the Render Widget Host View
-// of the selected tab.
-IAccessible* AccessibilityWinBrowserTest::GetRendererAccessible() {
-  content::WebContents* web_contents = shell()->web_contents();
-  return web_contents->GetRenderWidgetHostView()->GetNativeViewAccessible();
-}
-
-void AccessibilityWinBrowserTest::ExecuteScript(const std::wstring& script) {
-  shell()->web_contents()->GetMainFrame()->ExecuteJavaScript(script);
+  std::vector<base::win::ScopedVariant> children(
+      static_cast<size_t>(child_count));
+  for (size_t i = 0; i < children.size(); i++) {
+    children[i].Reset(children_array[i]);
+  }
+  return children;
 }
 
 
 // AccessibleChecker ----------------------------------------------------------
 
-class AccessibleChecker {
+class AccessibilityWinBrowserTest::AccessibleChecker {
  public:
   // This constructor can be used if the IA2 role will be the same as the MSAA
   // role.
   AccessibleChecker(const std::wstring& expected_name,
                     int32 expected_role,
                     const std::wstring& expected_value);
   AccessibleChecker(const std::wstring& expected_name,
                     int32 expected_role,
                     int32 expected_ia2_role,
                     const std::wstring& expected_value);
@@ skipping 41 matching lines @@
   std::wstring value_;
 
   // Expected accessible state. Checked against IAccessible::get_accState.
   LONG state_;
 
   // Expected accessible children. Checked using IAccessible::get_accChildCount
   // and ::AccessibleChildren.
   AccessibleCheckerVector children_;
 };
 
-AccessibleChecker::AccessibleChecker(const std::wstring& expected_name,
-                                     int32 expected_role,
-                                     const std::wstring& expected_value)
+AccessibilityWinBrowserTest::AccessibleChecker::AccessibleChecker(
+    const std::wstring& expected_name,
+    int32 expected_role,
+    const std::wstring& expected_value)
     : name_(expected_name),
       role_(expected_role),
       ia2_role_(expected_role),
       value_(expected_value),
       state_(-1) {
 }
 
-AccessibleChecker::AccessibleChecker(const std::wstring& expected_name,
-                                     int32 expected_role,
-                                     int32 expected_ia2_role,
-                                     const std::wstring& expected_value)
+AccessibilityWinBrowserTest::AccessibleChecker::AccessibleChecker(
+    const std::wstring& expected_name,
+    int32 expected_role,
+    int32 expected_ia2_role,
+    const std::wstring& expected_value)
     : name_(expected_name),
       role_(expected_role),
       ia2_role_(expected_ia2_role),
       value_(expected_value),
       state_(-1) {
 }
 
-AccessibleChecker::AccessibleChecker(const std::wstring& expected_name,
-                                     const std::wstring& expected_role,
-                                     int32 expected_ia2_role,
-                                     const std::wstring& expected_value)
+AccessibilityWinBrowserTest::AccessibleChecker::AccessibleChecker(
+    const std::wstring& expected_name,
+    const std::wstring& expected_role,
+    int32 expected_ia2_role,
+    const std::wstring& expected_value)
     : name_(expected_name),
       role_(expected_role.c_str()),
       ia2_role_(expected_ia2_role),
       value_(expected_value),
       state_(-1) {
 }
 
-void AccessibleChecker::AppendExpectedChild(
+void AccessibilityWinBrowserTest::AccessibleChecker::AppendExpectedChild(
     AccessibleChecker* expected_child) {
   children_.push_back(expected_child);
 }
 
-void AccessibleChecker::CheckAccessible(IAccessible* accessible) {
-  SCOPED_TRACE("while checking " +
-                   base::UTF16ToUTF8(RoleVariantToString(role_)));
+void AccessibilityWinBrowserTest::AccessibleChecker::CheckAccessible(
+    IAccessible* accessible) {
+  SCOPED_TRACE("While checking "
+                   + base::UTF16ToUTF8(RoleVariantToString(role_)));
   CheckAccessibleName(accessible);
   CheckAccessibleRole(accessible);
   CheckIA2Role(accessible);
   CheckAccessibleValue(accessible);
   CheckAccessibleState(accessible);
   CheckAccessibleChildren(accessible);
 }
 
-void AccessibleChecker::SetExpectedValue(const std::wstring& expected_value) {
+void AccessibilityWinBrowserTest::AccessibleChecker::SetExpectedValue(
+    const std::wstring& expected_value) {
   value_ = expected_value;
 }
 
-void AccessibleChecker::SetExpectedState(LONG expected_state) {
+void AccessibilityWinBrowserTest::AccessibleChecker::SetExpectedState(
+    LONG expected_state) {
   state_ = expected_state;
 }
 
-void AccessibleChecker::CheckAccessibleName(IAccessible* accessible) {
+void AccessibilityWinBrowserTest::AccessibleChecker::CheckAccessibleName(
+    IAccessible* accessible) {
   base::win::ScopedBstr name;
   base::win::ScopedVariant childid_self(CHILDID_SELF);
   HRESULT hr = accessible->get_accName(childid_self, name.Receive());
 
   if (name_.empty()) {
     // If the object doesn't have name S_FALSE should be returned.
     EXPECT_EQ(S_FALSE, hr);
   } else {
     // Test that the correct string was returned.
     EXPECT_EQ(S_OK, hr);
     EXPECT_EQ(name_, std::wstring(name, name.Length()));
   }
 }
 
-void AccessibleChecker::CheckAccessibleRole(IAccessible* accessible) {
+void AccessibilityWinBrowserTest::AccessibleChecker::CheckAccessibleRole(
+    IAccessible* accessible) {
   base::win::ScopedVariant role;
   base::win::ScopedVariant childid_self(CHILDID_SELF);
   HRESULT hr = accessible->get_accRole(childid_self, role.Receive());
   ASSERT_EQ(S_OK, hr);
   EXPECT_EQ(0, role_.Compare(role))
       << "Expected role: " << RoleVariantToString(role_)
       << "\nGot role: " << RoleVariantToString(role);
 }
 
-void AccessibleChecker::CheckIA2Role(IAccessible* accessible) {
+void AccessibilityWinBrowserTest::AccessibleChecker::CheckIA2Role(
+    IAccessible* accessible) {
   base::win::ScopedComPtr<IAccessible2> accessible2;
   HRESULT hr = QueryIAccessible2(accessible, accessible2.Receive());
   ASSERT_EQ(S_OK, hr);
   long ia2_role = 0;
   hr = accessible2->role(&ia2_role);
   ASSERT_EQ(S_OK, hr);
   EXPECT_EQ(ia2_role_, ia2_role)
     << "Expected ia2 role: " << IAccessible2RoleToString(ia2_role_)
     << "\nGot ia2 role: " << IAccessible2RoleToString(ia2_role);
 }
 
-void AccessibleChecker::CheckAccessibleValue(IAccessible* accessible) {
+void AccessibilityWinBrowserTest::AccessibleChecker::CheckAccessibleValue(
+    IAccessible* accessible) {
   // Don't check the value if if's a DOCUMENT role, because the value
   // is supposed to be the url (and we don't keep track of that in the
   // test expectations).
   base::win::ScopedVariant role;
   base::win::ScopedVariant childid_self(CHILDID_SELF);
   HRESULT hr = accessible->get_accRole(childid_self, role.Receive());
   ASSERT_EQ(S_OK, hr);
   if (role.type() == VT_I4 && V_I4(&role) == ROLE_SYSTEM_DOCUMENT)
     return;
 
   // Get the value.
   base::win::ScopedBstr value;
   hr = accessible->get_accValue(childid_self, value.Receive());
   EXPECT_EQ(S_OK, hr);
 
   // Test that the correct string was returned.
   EXPECT_EQ(value_, std::wstring(value, value.Length()));
 }
 
-void AccessibleChecker::CheckAccessibleState(IAccessible* accessible) {
+void AccessibilityWinBrowserTest::AccessibleChecker::CheckAccessibleState(
+    IAccessible* accessible) {
   if (state_ < 0)
     return;
 
   base::win::ScopedVariant state;
   base::win::ScopedVariant childid_self(CHILDID_SELF);
   HRESULT hr = accessible->get_accState(childid_self, state.Receive());
   EXPECT_EQ(S_OK, hr);
   ASSERT_EQ(VT_I4, state.type());
   LONG obj_state = V_I4(&state);
   // Avoid flakiness. The "offscreen" state depends on whether the browser
   // window is frontmost or not, and "hottracked" depends on whether the
   // mouse cursor happens to be over the element.
   obj_state &= ~(STATE_SYSTEM_OFFSCREEN | STATE_SYSTEM_HOTTRACKED);
   EXPECT_EQ(state_, obj_state)
     << "Expected state: " << IAccessibleStateToString(state_)
     << "\nGot state: " << IAccessibleStateToString(obj_state);
 }
 
-void AccessibleChecker::CheckAccessibleChildren(IAccessible* parent) {
-  LONG child_count = 0;
-  HRESULT hr = parent->get_accChildCount(&child_count);
-  EXPECT_EQ(S_OK, hr);
+void AccessibilityWinBrowserTest::AccessibleChecker::CheckAccessibleChildren(
+    IAccessible* parent) {
+  std::vector<base::win::ScopedVariant> obtained_children =
+      GetAllAccessibleChildren(parent);
+  size_t child_count = obtained_children.size();
   ASSERT_EQ(child_count, children_.size());
 
-  scoped_ptr<VARIANT[]> child_array(new VARIANT[child_count]);
-  LONG obtained_count = 0;
-  hr = AccessibleChildren(parent, 0, child_count,
-                          child_array.get(), &obtained_count);
-  ASSERT_EQ(S_OK, hr);
-  ASSERT_EQ(child_count, obtained_count);
-
-  VARIANT* child = child_array.get();
-  for (AccessibleCheckerVector::iterator child_checker = children_.begin();
-       child_checker != children_.end();
+  AccessibleCheckerVector::iterator child_checker;
+  std::vector<base::win::ScopedVariant>::iterator child;
+  for (child_checker = children_.begin(),
+       child = obtained_children.begin();
+       child_checker != children_.end()
+       && child != obtained_children.end();
        ++child_checker, ++child) {
     base::win::ScopedComPtr<IAccessible> child_accessible(
-        GetAccessibleFromResultVariant(parent, child));
+        GetAccessibleFromVariant(parent, child->AsInput()));
     ASSERT_TRUE(child_accessible.get());
     (*child_checker)->CheckAccessible(child_accessible);
   }
 }
 
-base::string16 AccessibleChecker::RoleVariantToString(
+base::string16
+AccessibilityWinBrowserTest::AccessibleChecker::RoleVariantToString(
     const base::win::ScopedVariant& role) {
   if (role.type() == VT_I4)
     return IAccessibleRoleToString(V_I4(&role));
   if (role.type() == VT_BSTR)
     return base::string16(V_BSTR(&role), SysStringLen(V_BSTR(&role)));
   return base::string16();
 }
 
 }  // namespace
 
@@ skipping 262 matching lines @@
   CHECK(hwnd);
   base::win::ScopedComPtr<IAccessible> browser_accessible;
   HRESULT hr = AccessibleObjectFromWindow(
       hwnd,
       OBJID_WINDOW,
       IID_IAccessible,
       reinterpret_cast<void**>(browser_accessible.Receive()));
   ASSERT_EQ(S_OK, hr);
 
   bool found = false;
-  RecursiveFindNodeInAccessibilityTree(
+  FindNodeInAccessibilityTree(
       browser_accessible.get(), ROLE_SYSTEM_DOCUMENT, L"MyDocument", 0, &found);
   ASSERT_EQ(found, true);
 }
 
 IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
                        SupportsISimpleDOM) {
   LoadInitialAccessibilityTreeFromHtml(
       "<body><input type='checkbox' /></body>");
 
   // Get the IAccessible object for the document.
@@ skipping 65 matching lines @@
                                       std::wstring());
   AccessibleChecker grouping2_checker(std::wstring(), ROLE_SYSTEM_GROUPING,
                                       std::wstring());
   AccessibleChecker document_checker(std::wstring(), ROLE_SYSTEM_DOCUMENT,
                                      std::wstring());
   document_checker.AppendExpectedChild(&grouping1_checker);
   document_checker.AppendExpectedChild(&grouping2_checker);
   document_checker.CheckAccessible(GetRendererAccessible());
 }
 
+IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
+                       TestTextAtOffsetWithInvalidArgs) {
+  base::win::ScopedComPtr<IAccessibleText> input_text;
+  base::win::ScopedComPtr<IAccessibleText> textarea_text;
+  SetUpTextFields(&input_text, &textarea_text);
+  HRESULT hr = input_text->get_textAtOffset(
+      0, IA2_TEXT_BOUNDARY_CHAR, NULL, NULL, NULL);
+  EXPECT_EQ(E_INVALIDARG, hr);
+  hr = textarea_text->get_textAtOffset(
+      0, IA2_TEXT_BOUNDARY_CHAR, NULL, NULL, NULL);
+  EXPECT_EQ(E_INVALIDARG, hr);
+
+  // Test invalid offset.
+  LONG start_offset = 0;
+  LONG end_offset = 0;
+  base::win::ScopedBstr text;
+  LONG invalid_offset = -5;
+  hr = input_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_CHAR,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(E_INVALIDARG, hr);
+  hr = textarea_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_WORD,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(E_INVALIDARG, hr);
+
+  // According to the IA2 Spec, only line boundaries should succeed when
+  // the offset is one past the end of the text.
+  invalid_offset = CONTENTS_LENGTH;
+  hr = input_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_LINE,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_OK, hr);
+  hr = textarea_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_LINE,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_OK, hr);
+
+  hr = input_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_CHAR,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_FALSE, hr);
+  hr = input_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_WORD,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_FALSE, hr);
+  hr = textarea_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_SENTENCE,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_FALSE, hr);
+  hr = textarea_text->get_textAtOffset(
+      invalid_offset, IA2_TEXT_BOUNDARY_ALL,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_FALSE, hr);
+}
+
+IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
+                       TestTextAtOffsetWithBoundaryCharacter) {
+  base::win::ScopedComPtr<IAccessibleText> input_text;
+  base::win::ScopedComPtr<IAccessibleText> textarea_text;
+  SetUpTextFields(&input_text, &textarea_text);
+  for (LONG offset = 0; offset < CONTENTS_LENGTH; ++offset) {
+    std::wstring expected_text(1, INPUT_CONTENTS[offset]);
+    LONG expected_start_offset = offset;
+    LONG expected_end_offset = offset + 1;
+    CheckTextAtOffset(input_text, offset, IA2_TEXT_BOUNDARY_CHAR,
+        expected_start_offset, expected_end_offset, expected_text);
+  }
+  for (LONG offset = CONTENTS_LENGTH - 1; offset >= 0; --offset) {
+    std::wstring expected_text(1, TEXTAREA_CONTENTS[offset]);
+    LONG expected_start_offset = offset;
+    LONG expected_end_offset = offset + 1;
+    CheckTextAtOffset(textarea_text, offset, IA2_TEXT_BOUNDARY_CHAR,
+        expected_start_offset, expected_end_offset, expected_text);
+  }
+  // Test special offsets.
+  CheckTextAtOffset(input_text, IA2_TEXT_OFFSET_LENGTH,
+      IA2_TEXT_BOUNDARY_CHAR, CONTENTS_LENGTH - 1, CONTENTS_LENGTH, L".");
+  CheckTextAtOffset(input_text, IA2_TEXT_OFFSET_CARET,
+      IA2_TEXT_BOUNDARY_CHAR, CONTENTS_LENGTH - 1, CONTENTS_LENGTH, L".");
+  CheckTextAtOffset(textarea_text, IA2_TEXT_OFFSET_LENGTH,
+      IA2_TEXT_BOUNDARY_CHAR, CONTENTS_LENGTH - 1, CONTENTS_LENGTH, L".");
+  CheckTextAtOffset(textarea_text, IA2_TEXT_OFFSET_CARET,
+      IA2_TEXT_BOUNDARY_CHAR, CONTENTS_LENGTH - 1, CONTENTS_LENGTH, L".");
+}
+
+IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
+                       TestTextAtOffsetWithBoundaryWord) {
+  base::win::ScopedComPtr<IAccessibleText> input_text;
+  base::win::ScopedComPtr<IAccessibleText> textarea_text;
+  SetUpTextFields(&input_text, &textarea_text);
+
+  // Trailing punctuation should be included as part of the previous word.
+  CheckTextAtOffset(input_text, 0, IA2_TEXT_BOUNDARY_WORD,
+      0, 4, L"Moz/");
+  CheckTextAtOffset(textarea_text, 2, IA2_TEXT_BOUNDARY_WORD,
+      0, 4, L"Moz/");
+
+  // If the offset is at the punctuation, it should return
+  // the previous word.
+  CheckTextAtOffset(textarea_text, 3, IA2_TEXT_BOUNDARY_WORD,
+      0, 4, L"Moz/");
+
+  // Numbers with a decimal point ("." for U.S), should be treated as one word.
+  // Also, trailing punctuation that occurs after empty space should be part of
+  // the word. ("5.0 (" and not "5.0 ".)
+  CheckTextAtOffset(input_text, 4, IA2_TEXT_BOUNDARY_WORD,
+      4, 9, L"5.0 (");
+  CheckTextAtOffset(textarea_text, 5, IA2_TEXT_BOUNDARY_WORD,
+      4, 9, L"5.0 (");
+  CheckTextAtOffset(input_text, 6, IA2_TEXT_BOUNDARY_WORD,
+      4, 9, L"5.0 (");
+  CheckTextAtOffset(textarea_text, 7, IA2_TEXT_BOUNDARY_WORD,
+      4, 9, L"5.0 (");
+
+  // Leading punctuation should not be included with the word after it.
+  CheckTextAtOffset(input_text, 8, IA2_TEXT_BOUNDARY_WORD,
+      4, 9, L"5.0 (");
+  CheckTextAtOffset(textarea_text, 11, IA2_TEXT_BOUNDARY_WORD,
+      9, 12, L"ST ");
+
+  // Numbers separated from letters with trailing punctuation should
+  // be split into two words. Same for abreviations like "i.e.".
+  CheckTextAtOffset(input_text, 12, IA2_TEXT_BOUNDARY_WORD,
+      12, 14, L"6.");
+  CheckTextAtOffset(textarea_text, 15, IA2_TEXT_BOUNDARY_WORD,
+      14, 17, L"x; ");
+
+  // Words with numbers should be treated like ordinary words.
+  CheckTextAtOffset(input_text, 17, IA2_TEXT_BOUNDARY_WORD,
+      17, 24, L"WWW33) ");
+  CheckTextAtOffset(textarea_text, 23, IA2_TEXT_BOUNDARY_WORD,
+      17, 24, L"WWW33)\n");
+  // Multiple trailing empty spaces should be part of the word preceding it.
+  CheckTextAtOffset(input_text, 28, IA2_TEXT_BOUNDARY_WORD,
+      24, 33, L"WebKit  \"");
+  CheckTextAtOffset(textarea_text, 31, IA2_TEXT_BOUNDARY_WORD,
+      24, 33, L"WebKit \n\"");
+  // Leading punctuation such as quotation marks should not be part of the word.
+  CheckTextAtOffset(input_text, 32, IA2_TEXT_BOUNDARY_WORD,
+      24, 33, L"WebKit  \"");
+  CheckTextAtOffset(textarea_text, 32, IA2_TEXT_BOUNDARY_WORD,
+      24, 33, L"WebKit \n\"");
+  CheckTextAtOffset(input_text, 33, IA2_TEXT_BOUNDARY_WORD,
+      33, 40, L"KHTML, ");
+  CheckTextAtOffset(textarea_text, 38, IA2_TEXT_BOUNDARY_WORD,
+      33, 40, L"KHTML, ");
+  // Trailing final punctuation should be part of the last word.
+  CheckTextAtOffset(input_text, 45, IA2_TEXT_BOUNDARY_WORD,
+      40, CONTENTS_LENGTH, L"like\".");
+  CheckTextAtOffset(textarea_text, 41, IA2_TEXT_BOUNDARY_WORD,
+      40, CONTENTS_LENGTH, L"like\".");
+  // Test special offsets.
+  CheckTextAtOffset(input_text, IA2_TEXT_OFFSET_LENGTH,
+      IA2_TEXT_BOUNDARY_WORD, 40, CONTENTS_LENGTH, L"like\".");
+  CheckTextAtOffset(input_text, IA2_TEXT_OFFSET_CARET,
+      IA2_TEXT_BOUNDARY_WORD, 40, CONTENTS_LENGTH, L"like\".");
+  CheckTextAtOffset(textarea_text, IA2_TEXT_OFFSET_LENGTH,
+      IA2_TEXT_BOUNDARY_WORD, 40, CONTENTS_LENGTH, L"like\".");
+  CheckTextAtOffset(textarea_text, IA2_TEXT_OFFSET_CARET,
+      IA2_TEXT_BOUNDARY_WORD, 40, CONTENTS_LENGTH, L"like\".");
+}
+
+IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
+                       TestTextAtOffsetWithBoundarySentence) {
+  base::win::ScopedComPtr<IAccessibleText> input_text;
+  base::win::ScopedComPtr<IAccessibleText> textarea_text;
+  SetUpTextFields(&input_text, &textarea_text);
+
+  // Sentence navigation is not currently implemented.
+  LONG start_offset = 0;
+  LONG end_offset = 0;
+  base::win::ScopedBstr text;
+  HRESULT hr = input_text->get_textAtOffset(
+      5, IA2_TEXT_BOUNDARY_SENTENCE,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_FALSE, hr);
+  hr = textarea_text->get_textAtOffset(
+      25, IA2_TEXT_BOUNDARY_SENTENCE,
+      &start_offset, &end_offset, text.Receive());
+  EXPECT_EQ(S_FALSE, hr);
+}
+
+IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
+                       TestTextAtOffsetWithBoundaryLine) {
+  base::win::ScopedComPtr<IAccessibleText> input_text;
+  base::win::ScopedComPtr<IAccessibleText> textarea_text;
+  SetUpTextFields(&input_text, &textarea_text);
+
+  // Single line text fields should return the whole text.
+  CheckTextAtOffset(input_text, 0, IA2_TEXT_BOUNDARY_LINE,
+      0, CONTENTS_LENGTH, base::ASCIIToWide(INPUT_CONTENTS));
+  // Textarea is a multi-line text field.
+  CheckTextAtOffset(textarea_text, 0, IA2_TEXT_BOUNDARY_LINE,
+      0, 24, L"Moz/5.0 (ST 6.x; WWW33)\n");
+  // If the offset is at the newline, return the line preceding it.
+  CheckTextAtOffset(textarea_text, 31, IA2_TEXT_BOUNDARY_LINE,
+      24, 32, L"WebKit \n");
+  // Last line does not have a trailing newline.
+  CheckTextAtOffset(textarea_text, 32, IA2_TEXT_BOUNDARY_LINE,
+      32, CONTENTS_LENGTH, L"\"KHTML, like\".");
+  // An offset one past the last character should return the last line.
+  CheckTextAtOffset(textarea_text, CONTENTS_LENGTH, IA2_TEXT_BOUNDARY_LINE,
+      32, CONTENTS_LENGTH, L"\"KHTML, like\".");
+  // Test special offsets.
+  CheckTextAtOffset(textarea_text, IA2_TEXT_OFFSET_LENGTH,
+      IA2_TEXT_BOUNDARY_LINE, 32, CONTENTS_LENGTH, L"\"KHTML, like\".");
+  CheckTextAtOffset(textarea_text, IA2_TEXT_OFFSET_CARET,
+      IA2_TEXT_BOUNDARY_LINE, 32, CONTENTS_LENGTH, L"\"KHTML, like\".");
+}
+
+IN_PROC_BROWSER_TEST_F(AccessibilityWinBrowserTest,
+                       TestTextAtOffsetWithBoundaryAll) {
+  base::win::ScopedComPtr<IAccessibleText> input_text;
+  base::win::ScopedComPtr<IAccessibleText> textarea_text;
+  SetUpTextFields(&input_text, &textarea_text);
+
+  CheckTextAtOffset(input_text, 0, IA2_TEXT_BOUNDARY_ALL,
+      0, CONTENTS_LENGTH, base::ASCIIToWide(INPUT_CONTENTS));
+  CheckTextAtOffset(textarea_text, CONTENTS_LENGTH - 1, IA2_TEXT_BOUNDARY_ALL,
+      0, CONTENTS_LENGTH, base::ASCIIToWide(TEXTAREA_CONTENTS));
+}
+
 }  // namespace content