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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/accessibility/accessibility_tree_formatter_android_external.h"
#include <string>
#include "content/browser/accessibility/browser_accessibility_android.h"
static const char kStringKey[] = "key";
static const char kErrorMessage[] = "Error";
namespace content {
AccessibilityTreeFormatterAndroidExternal::
AccessibilityTreeFormatterAndroidExternal() = default;
AccessibilityTreeFormatterAndroidExternal::
~AccessibilityTreeFormatterAndroidExternal() = default;
base::Value::Dict AccessibilityTreeFormatterAndroidExternal::BuildTree(
ui::AXPlatformNodeDelegate* root) const {
if (!root) {
return base::Value::Dict();
}
base::Value::Dict dict;
RecursiveBuildTree(*root, &dict);
return dict;
}
void AccessibilityTreeFormatterAndroidExternal::RecursiveBuildTree(
const ui::AXPlatformNodeDelegate& node,
base::Value::Dict* dict) const {
const BrowserAccessibilityAndroid* android_node =
static_cast<const BrowserAccessibilityAndroid*>(&node);
// If a null string is returned, web contents likely doesn't exist, and it is
// a sign that an accessibility service was disable. Print warning and escape.
// TODO: It would be interesting to allow filtering here in the future.
std::u16string str = android_node->GenerateAccessibilityNodeInfoString();
if (str.empty()) {
dict->Set(kStringKey, kErrorMessage);
return;
}
dict->Set(kStringKey, str);
base::Value::List children;
for (size_t i = 0; i < node.GetChildCount(); ++i) {
ui::BrowserAccessibility* child_node = android_node->PlatformGetChild(i);
base::Value::Dict child_dict;
RecursiveBuildTree(*child_node, &child_dict);
children.Append(std::move(child_dict));
}
dict->Set(kChildrenDictAttr, std::move(children));
}
std::string AccessibilityTreeFormatterAndroidExternal::ProcessTreeForOutput(
const base::Value::Dict& dict) const {
const std::string* line = dict.FindString(kStringKey);
if (line) {
return *line;
}
return std::string();
}
} // namespace content
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