1 files changed, 127 insertions, 0 deletions
diff --git a/chromium/ui/accessibility/platform/compute_attributes.cc b/chromium/ui/accessibility/platform/compute_attributes.cc
new file mode 100644
index 00000000000..1b04e0ebfe4
--- /dev/null
+++ b/chromium/ui/accessibility/platform/compute_attributes.cc
@@ -0,0 +1,127 @@
+// Copyright 2018 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 "ui/accessibility/platform/compute_attributes.h"
+
+#include <cstddef>
+
+#include "base/optional.h"
+#include "ui/accessibility/ax_enums.mojom.h"
+#include "ui/accessibility/ax_node_data.h"
+#include "ui/accessibility/platform/ax_platform_node_delegate.h"
+
+namespace ui {
+namespace {
+
+base::Optional<int32_t> GetCellAttribute(
+    const ui::AXPlatformNodeDelegate* delegate,
+    ax::mojom::IntAttribute attribute) {
+  switch (attribute) {
+    case ax::mojom::IntAttribute::kAriaCellColumnIndex:
+      return delegate->GetTableCellAriaColIndex();
+    case ax::mojom::IntAttribute::kAriaCellRowIndex:
+      return delegate->GetTableCellAriaRowIndex();
+    case ax::mojom::IntAttribute::kTableCellColumnIndex:
+      return delegate->GetTableCellColIndex();
+    case ax::mojom::IntAttribute::kTableCellRowIndex:
+      return delegate->GetTableCellRowIndex();
+    case ax::mojom::IntAttribute::kTableCellColumnSpan:
+      return delegate->GetTableCellColSpan();
+    case ax::mojom::IntAttribute::kTableCellRowSpan:
+      return delegate->GetTableCellRowSpan();
+    default:
+      return base::nullopt;
+  }
+}
+
+base::Optional<int32_t> GetRowAttribute(
+    const ui::AXPlatformNodeDelegate* delegate,
+    ax::mojom::IntAttribute attribute) {
+  if (attribute == ax::mojom::IntAttribute::kTableRowIndex) {
+    return delegate->GetTableRowRowIndex();
+  }
+  return base::nullopt;
+}
+
+base::Optional<int32_t> GetTableAttribute(
+    const ui::AXPlatformNodeDelegate* delegate,
+    ax::mojom::IntAttribute attribute) {
+  switch (attribute) {
+    case ax::mojom::IntAttribute::kTableColumnCount:
+      return delegate->GetTableColCount();
+    case ax::mojom::IntAttribute::kTableRowCount:
+      return delegate->GetTableRowCount();
+    case ax::mojom::IntAttribute::kAriaColumnCount:
+      return delegate->GetTableAriaColCount();
+    case ax::mojom::IntAttribute::kAriaRowCount:
+      return delegate->GetTableAriaRowCount();
+    default:
+      return base::nullopt;
+  }
+}
+
+base::Optional<int32_t> GetOrderedSetItemAttribute(
+    const ui::AXPlatformNodeDelegate* delegate,
+    ax::mojom::IntAttribute attribute) {
+  int value = 0;
+  switch (attribute) {
+    case ax::mojom::IntAttribute::kPosInSet:
+      value = delegate->GetPosInSet();
+      return value;
+    case ax::mojom::IntAttribute::kSetSize:
+      value = delegate->GetSetSize();
+      return value;
+    default:
+      return base::nullopt;
+  }
+}
+
+base::Optional<int32_t> GetOrderedSetAttribute(
+    const ui::AXPlatformNodeDelegate* delegate,
+    ax::mojom::IntAttribute attribute) {
+  int value = 0;
+  switch (attribute) {
+    case ax::mojom::IntAttribute::kSetSize:
+      value = delegate->GetSetSize();
+      return value;
+    default:
+      return base::nullopt;
+  }
+}
+
+base::Optional<int32_t> GetFromData(const ui::AXPlatformNodeDelegate* delegate,
+                                    ax::mojom::IntAttribute attribute) {
+  int32_t value;
+  if (delegate->GetData().GetIntAttribute(attribute, &value)) {
+    return value;
+  }
+  return base::nullopt;
+}
+
+}  // namespace
+
+base::Optional<int32_t> ComputeAttribute(
+    const ui::AXPlatformNodeDelegate* delegate,
+    ax::mojom::IntAttribute attribute) {
+  base::Optional<int32_t> maybe_value = base::nullopt;
+  // Table-related nodes.
+  if (delegate->IsTableCellOrHeader())
+    maybe_value = GetCellAttribute(delegate, attribute);
+  else if (delegate->IsTableRow())
+    maybe_value = GetRowAttribute(delegate, attribute);
+  else if (delegate->IsTable())
+    maybe_value = GetTableAttribute(delegate, attribute);
+  // Ordered-set-related nodes.
+  else if (delegate->IsOrderedSetItem())
+    maybe_value = GetOrderedSetItemAttribute(delegate, attribute);
+  else if (delegate->IsOrderedSet())
+    maybe_value = GetOrderedSetAttribute(delegate, attribute);
+
+  if (!maybe_value.has_value()) {
+    return GetFromData(delegate, attribute);
+  }
+  return maybe_value;
+}
+
+}  // namespace ui