Revert of Refactor content/renderer/accessibility to use AXTreeSerializer.

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"
+#include "base/strings/utf_string_conversions.h"
+#include "content/renderer/accessibility/blink_ax_enum_conversion.h"
+#include "third_party/WebKit/public/platform/WebRect.h"
+#include "third_party/WebKit/public/platform/WebSize.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/platform/WebVector.h"
+#include "third_party/WebKit/public/web/WebAXEnums.h"
+#include "third_party/WebKit/public/web/WebAXObject.h"
+#include "third_party/WebKit/public/web/WebDocument.h"
+#include "third_party/WebKit/public/web/WebDocumentType.h"
+#include "third_party/WebKit/public/web/WebElement.h"
+#include "third_party/WebKit/public/web/WebFormControlElement.h"
+#include "third_party/WebKit/public/web/WebFrame.h"
+#include "third_party/WebKit/public/web/WebInputElement.h"
+#include "third_party/WebKit/public/web/WebNode.h"
+
+using base::UTF16ToUTF8;
+using blink::WebAXObject;
+using blink::WebDocument;
+using blink::WebDocumentType;
+using blink::WebElement;
+using blink::WebNode;
+using blink::WebVector;
+
+namespace content {
+namespace {
+
+// Returns true if |ancestor| is the first unignored parent of |child|,
+// which means that when walking up the parent chain from |child|,
+// |ancestor| is the *first* ancestor that isn't marked as
+// accessibilityIsIgnored().
+bool IsParentUnignoredOf(const WebAXObject& ancestor,
+                         const WebAXObject& child) {
+  WebAXObject parent = child.parentObject();
+  while (!parent.isDetached() && parent.accessibilityIsIgnored())
+    parent = parent.parentObject();
+  return parent.equals(ancestor);
+}
+
+  bool IsTrue(std::string html_value) {
+  return LowerCaseEqualsASCII(html_value, "true");
+}
+
+std::string GetEquivalentAriaRoleString(const ui::AXRole role) {
+  switch (role) {
+    case ui::AX_ROLE_ARTICLE:
+      return "article";
+    case ui::AX_ROLE_BANNER:
+      return "banner";
+    case ui::AX_ROLE_COMPLEMENTARY:
+      return "complementary";
+    case ui::AX_ROLE_CONTENT_INFO:
+    case ui::AX_ROLE_FOOTER:
+      return "contentinfo";
+    case ui::AX_ROLE_MAIN:
+      return "main";
+    case ui::AX_ROLE_NAVIGATION:
+      return "navigation";
+    case ui::AX_ROLE_REGION:
+      return "region";
+    default:
+      break;
+  }
+
+  return std::string();
+}
+
+void AddIntListAttributeFromWebObjects(ui::AXIntListAttribute attr,
+                                       WebVector<WebAXObject> objects,
+                                       ui::AXNodeData* dst) {
+  std::vector<int32> ids;
+  for(size_t i = 0; i < objects.size(); i++)
+    ids.push_back(objects[i].axID());
+  if (ids.size() > 0)
+    dst->AddIntListAttribute(attr, ids);
+}
+
+
+}  // Anonymous namespace
+
+void SerializeAccessibilityNode(
+    const WebAXObject& src,
+    ui::AXNodeData* dst) {
+  dst->role = AXRoleFromBlink(src.role());
+  dst->state = AXStateFromBlink(src);
+  dst->location = src.boundingBoxRect();
+  dst->id = src.axID();
+  std::string name = base::UTF16ToUTF8(src.title());
+
+  std::string value;
+  if (src.valueDescription().length()) {
+    dst->AddStringAttribute(ui::AX_ATTR_VALUE,
+                            UTF16ToUTF8(src.valueDescription()));
+  } else {
+    dst->AddStringAttribute(ui::AX_ATTR_VALUE, UTF16ToUTF8(src.stringValue()));
+  }
+
+  if (dst->role == ui::AX_ROLE_COLOR_WELL) {
+    int r, g, b;
+    src.colorValue(r, g, b);
+    dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_RED, r);
+    dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_GREEN, g);
+    dst->AddIntAttribute(ui::AX_ATTR_COLOR_VALUE_BLUE, b);
+  }
+
+  if (dst->role == ui::AX_ROLE_INLINE_TEXT_BOX) {
+    dst->AddIntAttribute(ui::AX_ATTR_TEXT_DIRECTION,
+                         AXTextDirectionFromBlink(src.textDirection()));
+
+    WebVector<int> src_character_offsets;
+    src.characterOffsets(src_character_offsets);
+    std::vector<int32> character_offsets;
+    character_offsets.reserve(src_character_offsets.size());
+    for (size_t i = 0; i < src_character_offsets.size(); ++i)
+      character_offsets.push_back(src_character_offsets[i]);
+    dst->AddIntListAttribute(ui::AX_ATTR_CHARACTER_OFFSETS, character_offsets);
+
+    WebVector<int> src_word_starts;
+    WebVector<int> src_word_ends;
+    src.wordBoundaries(src_word_starts, src_word_ends);
+    std::vector<int32> word_starts;
+    std::vector<int32> word_ends;
+    word_starts.reserve(src_word_starts.size());
+    word_ends.reserve(src_word_starts.size());
+    for (size_t i = 0; i < src_word_starts.size(); ++i) {
+      word_starts.push_back(src_word_starts[i]);
+      word_ends.push_back(src_word_ends[i]);
+    }
+    dst->AddIntListAttribute(ui::AX_ATTR_WORD_STARTS, word_starts);
+    dst->AddIntListAttribute(ui::AX_ATTR_WORD_ENDS, word_ends);
+  }
+
+  if (src.accessKey().length())
+    dst->AddStringAttribute(ui::AX_ATTR_ACCESS_KEY,
+        UTF16ToUTF8(src.accessKey()));
+  if (src.actionVerb().length())
+    dst->AddStringAttribute(ui::AX_ATTR_ACTION, UTF16ToUTF8(src.actionVerb()));
+  if (src.isAriaReadOnly())
+    dst->AddBoolAttribute(ui::AX_ATTR_ARIA_READONLY, true);
+  if (src.isButtonStateMixed())
+    dst->AddBoolAttribute(ui::AX_ATTR_BUTTON_MIXED, true);
+  if (src.canSetValueAttribute())
+    dst->AddBoolAttribute(ui::AX_ATTR_CAN_SET_VALUE, true);
+  if (src.accessibilityDescription().length()) {
+    dst->AddStringAttribute(ui::AX_ATTR_DESCRIPTION,
+                            UTF16ToUTF8(src.accessibilityDescription()));
+  }
+  if (src.hasComputedStyle()) {
+    dst->AddStringAttribute(ui::AX_ATTR_DISPLAY,
+                            UTF16ToUTF8(src.computedStyleDisplay()));
+  }
+  if (src.helpText().length())
+    dst->AddStringAttribute(ui::AX_ATTR_HELP, UTF16ToUTF8(src.helpText()));
+  if (src.keyboardShortcut().length()) {
+    dst->AddStringAttribute(ui::AX_ATTR_SHORTCUT,
+                            UTF16ToUTF8(src.keyboardShortcut()));
+  }
+  if (!src.titleUIElement().isDetached()) {
+    dst->AddIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT,
+                         src.titleUIElement().axID());
+  }
+  if (!src.ariaActiveDescendant().isDetached()) {
+    dst->AddIntAttribute(ui::AX_ATTR_ACTIVEDESCENDANT_ID,
+                         src.ariaActiveDescendant().axID());
+  }
+
+  if (!src.url().isEmpty())
+    dst->AddStringAttribute(ui::AX_ATTR_URL, src.url().spec());
+
+  if (dst->role == ui::AX_ROLE_HEADING)
+    dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL, src.headingLevel());
+  else if ((dst->role == ui::AX_ROLE_TREE_ITEM ||
+            dst->role == ui::AX_ROLE_ROW) &&
+           src.hierarchicalLevel() > 0) {
+    dst->AddIntAttribute(ui::AX_ATTR_HIERARCHICAL_LEVEL,
+        src.hierarchicalLevel());
+  }
+
+  // Treat the active list box item as focused.
+  if (dst->role == ui::AX_ROLE_LIST_BOX_OPTION &&
+      src.isSelectedOptionActive()) {
+    dst->state |= (1 << ui::AX_STATE_FOCUSED);
+  }
+
+  if (src.canvasHasFallbackContent())
+    dst->AddBoolAttribute(ui::AX_ATTR_CANVAS_HAS_FALLBACK, true);
+
+  WebNode node = src.node();
+  bool is_iframe = false;
+  std::string live_atomic;
+  std::string live_busy;
+  std::string live_status;
+  std::string live_relevant;
+
+  if (!node.isNull() && node.isElementNode()) {
+    WebElement element = node.to<WebElement>();
+    is_iframe = (element.tagName() == base::ASCIIToUTF16("IFRAME"));
+
+    if (LowerCaseEqualsASCII(element.getAttribute("aria-expanded"), "true"))
+      dst->state |= (1 << ui::AX_STATE_EXPANDED);
+
+    // TODO(ctguil): The tagName in WebKit is lower cased but
+    // HTMLElement::nodeName calls localNameUpper. Consider adding
+    // a WebElement method that returns the original lower cased tagName.
+    dst->AddStringAttribute(
+        ui::AX_ATTR_HTML_TAG,
+        StringToLowerASCII(UTF16ToUTF8(element.tagName())));
+    for (unsigned i = 0; i < element.attributeCount(); ++i) {
+      std::string name = StringToLowerASCII(base::UTF16ToUTF8(
+          element.attributeLocalName(i)));
+      std::string value = base::UTF16ToUTF8(element.attributeValue(i));
+      dst->html_attributes.push_back(std::make_pair(name, value));
+    }
+
+    if (dst->role == ui::AX_ROLE_EDITABLE_TEXT ||
+        dst->role == ui::AX_ROLE_TEXT_AREA ||
+        dst->role == ui::AX_ROLE_TEXT_FIELD) {
+      dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, src.selectionStart());
+      dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, src.selectionEnd());
+
+      WebVector<int> src_line_breaks;
+      src.lineBreaks(src_line_breaks);
+      if (src_line_breaks.size() > 0) {
+        std::vector<int32> line_breaks;
+        line_breaks.reserve(src_line_breaks.size());
+        for (size_t i = 0; i < src_line_breaks.size(); ++i)
+          line_breaks.push_back(src_line_breaks[i]);
+        dst->AddIntListAttribute(ui::AX_ATTR_LINE_BREAKS, line_breaks);
+      }
+    }
+
+    // ARIA role.
+    if (element.hasAttribute("role")) {
+      dst->AddStringAttribute(ui::AX_ATTR_ROLE,
+                              UTF16ToUTF8(element.getAttribute("role")));
+    } else {
+      std::string role = GetEquivalentAriaRoleString(dst->role);
+      if (!role.empty())
+        dst->AddStringAttribute(ui::AX_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
+  std::string container_live_atomic;
+  std::string container_live_busy;
+  std::string container_live_status;
+  std::string container_live_relevant;
+  WebAXObject container_accessible = src;
+  while (!container_accessible.isDetached()) {
+    WebNode container_node = container_accessible.node();
+    if (!container_node.isNull() && container_node.isElementNode()) {
+      WebElement container_elem = container_node.to<WebElement>();
+      if (container_elem.hasAttribute("aria-atomic") &&
+          container_live_atomic.empty()) {
+        container_live_atomic =
+            base::UTF16ToUTF8(container_elem.getAttribute("aria-atomic"));
+      }
+      if (container_elem.hasAttribute("aria-busy") &&
+          container_live_busy.empty()) {
+        container_live_busy =
+            base::UTF16ToUTF8(container_elem.getAttribute("aria-busy"));
+      }
+      if (container_elem.hasAttribute("aria-live") &&
+          container_live_status.empty()) {
+        container_live_status =
+            base::UTF16ToUTF8(container_elem.getAttribute("aria-live"));
+      }
+      if (container_elem.hasAttribute("aria-relevant") &&
+          container_live_relevant.empty()) {
+        container_live_relevant =
+            base::UTF16ToUTF8(container_elem.getAttribute("aria-relevant"));
+      }
+    }
+    container_accessible = container_accessible.parentObject();
+  }
+
+  if (!live_atomic.empty())
+    dst->AddBoolAttribute(ui::AX_ATTR_LIVE_ATOMIC, IsTrue(live_atomic));
+  if (!live_busy.empty())
+    dst->AddBoolAttribute(ui::AX_ATTR_LIVE_BUSY, IsTrue(live_busy));
+  if (!live_status.empty())
+    dst->AddStringAttribute(ui::AX_ATTR_LIVE_STATUS, live_status);
+  if (!live_relevant.empty())
+    dst->AddStringAttribute(ui::AX_ATTR_LIVE_RELEVANT, live_relevant);
+
+  if (!container_live_atomic.empty()) {
+    dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_ATOMIC,
+                          IsTrue(container_live_atomic));
+  }
+  if (!container_live_busy.empty()) {
+    dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_BUSY,
+                          IsTrue(container_live_busy));
+  }
+  if (!container_live_status.empty()) {
+    dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_STATUS,
+                            container_live_status);
+  }
+  if (!container_live_relevant.empty()) {
+    dst->AddStringAttribute(ui::AX_ATTR_CONTAINER_LIVE_RELEVANT,
+                            container_live_relevant);
+  }
+
+  if (dst->role == ui::AX_ROLE_PROGRESS_INDICATOR ||
+      dst->role == ui::AX_ROLE_SCROLL_BAR ||
+      dst->role == ui::AX_ROLE_SLIDER ||
+      dst->role == ui::AX_ROLE_SPIN_BUTTON) {
+    dst->AddFloatAttribute(ui::AX_ATTR_VALUE_FOR_RANGE, src.valueForRange());
+    dst->AddFloatAttribute(ui::AX_ATTR_MAX_VALUE_FOR_RANGE,
+                           src.maxValueForRange());
+    dst->AddFloatAttribute(ui::AX_ATTR_MIN_VALUE_FOR_RANGE,
+                           src.minValueForRange());
+  }
+
+  if (dst->role == ui::AX_ROLE_DOCUMENT ||
+      dst->role == ui::AX_ROLE_WEB_AREA) {
+    dst->AddStringAttribute(ui::AX_ATTR_HTML_TAG, "#document");
+    const WebDocument& document = src.document();
+    if (name.empty())
+      name = UTF16ToUTF8(document.title());
+    dst->AddStringAttribute(ui::AX_ATTR_DOC_TITLE,
+        UTF16ToUTF8(document.title()));
+    dst->AddStringAttribute(ui::AX_ATTR_DOC_URL, document.url().spec());
+    dst->AddStringAttribute(
+        ui::AX_ATTR_DOC_MIMETYPE,
+        document.isXHTMLDocument() ? "text/xhtml" : "text/html");
+    dst->AddBoolAttribute(ui::AX_ATTR_DOC_LOADED, src.isLoaded());
+    dst->AddFloatAttribute(ui::AX_ATTR_DOC_LOADING_PROGRESS,
+                           src.estimatedLoadingProgress());
+
+    const WebDocumentType& doctype = document.doctype();
+    if (!doctype.isNull()) {
+      dst->AddStringAttribute(ui::AX_ATTR_DOC_DOCTYPE,
+                              UTF16ToUTF8(doctype.name()));
+    }
+
+    const gfx::Size& scroll_offset = document.frame()->scrollOffset();
+    dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X, scroll_offset.width());
+    dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y, scroll_offset.height());
+
+    const gfx::Size& min_offset = document.frame()->minimumScrollOffset();
+    dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MIN, min_offset.width());
+    dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MIN, min_offset.height());
+
+    const gfx::Size& max_offset = document.frame()->maximumScrollOffset();
+    dst->AddIntAttribute(ui::AX_ATTR_SCROLL_X_MAX, max_offset.width());
+    dst->AddIntAttribute(ui::AX_ATTR_SCROLL_Y_MAX, max_offset.height());
+  }
+
+  if (dst->role == ui::AX_ROLE_TABLE) {
+    int column_count = src.columnCount();
+    int row_count = src.rowCount();
+    if (column_count > 0 && row_count > 0) {
+      std::set<int32> unique_cell_id_set;
+      std::vector<int32> cell_ids;
+      std::vector<int32> unique_cell_ids;
+      dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_COUNT, column_count);
+      dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_COUNT, row_count);
+      WebAXObject header = src.headerContainerObject();
+      if (!header.isDetached())
+        dst->AddIntAttribute(ui::AX_ATTR_TABLE_HEADER_ID, header.axID());
+      for (int i = 0; i < column_count * row_count; ++i) {
+        WebAXObject cell = src.cellForColumnAndRow(
+            i % column_count, i / column_count);
+        int cell_id = -1;
+        if (!cell.isDetached()) {
+          cell_id = cell.axID();
+          if (unique_cell_id_set.find(cell_id) == unique_cell_id_set.end()) {
+            unique_cell_id_set.insert(cell_id);
+            unique_cell_ids.push_back(cell_id);
+          }
+        }
+        cell_ids.push_back(cell_id);
+      }
+      dst->AddIntListAttribute(ui::AX_ATTR_CELL_IDS, cell_ids);
+      dst->AddIntListAttribute(ui::AX_ATTR_UNIQUE_CELL_IDS, unique_cell_ids);
+    }
+  }
+
+  if (dst->role == ui::AX_ROLE_ROW) {
+    dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_INDEX, src.rowIndex());
+    WebAXObject header = src.rowHeader();
+    if (!header.isDetached())
+      dst->AddIntAttribute(ui::AX_ATTR_TABLE_ROW_HEADER_ID, header.axID());
+  }
+
+  if (dst->role == ui::AX_ROLE_COLUMN) {
+    dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_INDEX, src.columnIndex());
+    WebAXObject header = src.columnHeader();
+    if (!header.isDetached())
+      dst->AddIntAttribute(ui::AX_ATTR_TABLE_COLUMN_HEADER_ID, header.axID());
+  }
+
+  if (dst->role == ui::AX_ROLE_CELL ||
+      dst->role == ui::AX_ROLE_ROW_HEADER ||
+      dst->role == ui::AX_ROLE_COLUMN_HEADER) {
+    dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_INDEX,
+                         src.cellColumnIndex());
+    dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_COLUMN_SPAN,
+                         src.cellColumnSpan());
+    dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_INDEX, src.cellRowIndex());
+    dst->AddIntAttribute(ui::AX_ATTR_TABLE_CELL_ROW_SPAN, src.cellRowSpan());
+  }
+
+  dst->AddStringAttribute(ui::AX_ATTR_NAME, name);
+
+  // Add the ids of *indirect* children - those who are children of this node,
+  // but whose parent is *not* this node. One example is a table
+  // cell, which is a child of both a row and a column. Because the cell's
+  // parent is the row, the row adds it as a child, and the column adds it
+  // as an indirect child.
+  int child_count = src.childCount();
+  std::vector<int32> indirect_child_ids;
+  for (int i = 0; i < child_count; ++i) {
+    WebAXObject child = src.childAt(i);
+    if (!is_iframe && !child.isDetached() && !IsParentUnignoredOf(src, child))
+      indirect_child_ids.push_back(child.axID());
+  }
+  if (indirect_child_ids.size() > 0) {
+    dst->AddIntListAttribute(ui::AX_ATTR_INDIRECT_CHILD_IDS,
+                             indirect_child_ids);
+  }
+
+  WebVector<WebAXObject> controls;
+  if (src.ariaControls(controls))
+    AddIntListAttributeFromWebObjects(ui::AX_ATTR_CONTROLS_IDS, controls, dst);
+
+  WebVector<WebAXObject> describedby;
+  if (src.ariaDescribedby(describedby)) {
+    AddIntListAttributeFromWebObjects(
+        ui::AX_ATTR_DESCRIBEDBY_IDS, describedby, dst);
+  }
+
+  WebVector<WebAXObject> flowTo;
+  if (src.ariaFlowTo(flowTo))
+    AddIntListAttributeFromWebObjects(ui::AX_ATTR_FLOWTO_IDS, flowTo, dst);
+
+  WebVector<WebAXObject> labelledby;
+  if (src.ariaLabelledby(labelledby)) {
+    AddIntListAttributeFromWebObjects(
+        ui::AX_ATTR_LABELLEDBY_IDS, labelledby, dst);
+  }
+
+  WebVector<WebAXObject> owns;
+  if (src.ariaOwns(owns))
+    AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
+}
+
+bool ShouldIncludeChildNode(
+    const WebAXObject& parent,
+    const WebAXObject& child) {
+  // The child may be invalid due to issues in webkit accessibility code.
+  // Don't add children that are invalid thus preventing a crash.
+  // https://bugs.webkit.org/show_bug.cgi?id=44149
+  // TODO(ctguil): We may want to remove this check as webkit stabilizes.
+  if (child.isDetached())
+    return false;
+
+  // Skip children whose parent isn't this - see indirect_child_ids, above.
+  // As an exception, include children of an iframe element.
+  bool is_iframe = false;
+  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