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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <optional>
#include <set>
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "content/browser/accessibility/browser_accessibility_android.h"
#include "content/browser/accessibility/browser_accessibility_manager_android.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/url_constants.h"
#include "content/public/test/accessibility_notification_waiter.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/content_browser_test_utils.h"
#include "content/public/test/scoped_accessibility_mode_override.h"
#include "content/shell/browser/shell.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
const int GRANULARITY_CHARACTER =
ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_CHARACTER;
const int GRANULARITY_WORD =
ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_WORD;
const int GRANULARITY_LINE =
ANDROID_ACCESSIBILITY_NODE_INFO_MOVEMENT_GRANULARITY_LINE;
class AndroidGranularityMovementBrowserTest : public ContentBrowserTest {
protected:
AndroidGranularityMovementBrowserTest() = default;
~AndroidGranularityMovementBrowserTest() override = default;
void SetUpOnMainThread() override {
accessibility_mode_.emplace(ui::kAXModeComplete);
}
void TearDownOnMainThread() override { accessibility_mode_.reset(); }
ui::BrowserAccessibility* LoadUrlAndGetAccessibilityRoot(const GURL& url) {
EXPECT_TRUE(NavigateToURL(shell(), GURL(url::kAboutBlankURL)));
// Load the page.
AccessibilityNotificationWaiter waiter(shell()->web_contents(),
ax::mojom::Event::kLoadComplete);
EXPECT_TRUE(NavigateToURL(shell(), url));
EXPECT_TRUE(waiter.WaitForNotification());
// Get the BrowserAccessibilityManager.
WebContentsImpl* web_contents =
static_cast<WebContentsImpl*>(shell()->web_contents());
return web_contents->GetRootBrowserAccessibilityManager()
->GetBrowserAccessibilityRoot();
}
// First, set accessibility focus to a node and wait for the update that
// loads inline text boxes for that node. (We load inline text boxes
// asynchronously on Android since we only ever need them for the node
// with accessibility focus.)
//
// Then call NextAtGranularity repeatedly and return a string that
// concatenates all of the text of the returned text ranges.
//
// As an example, if the node's text is "cat dog" and you traverse by
// word, this returns "'cat', 'dog'".
//
// Also calls PreviousAtGranularity from the end back to the beginning
// and fails (by logging an error and returning the empty string) if
// the result when traversing backwards is not the same
// (but in reverse order).
std::u16string TraverseNodeAtGranularity(ui::BrowserAccessibility* node,
int granularity) {
AccessibilityNotificationWaiter waiter(shell()->web_contents(),
ax::mojom::Event::kTreeChanged);
node->manager()->LoadInlineTextBoxes(*node);
EXPECT_TRUE(waiter.WaitForNotification());
int start_index = -1;
int end_index = -1;
BrowserAccessibilityAndroid* android_node =
static_cast<BrowserAccessibilityAndroid*>(node);
BrowserAccessibilityManagerAndroid* manager =
static_cast<BrowserAccessibilityManagerAndroid*>(node->manager());
std::u16string text = android_node->GetAccessibleNameUTF16();
std::u16string concatenated;
int previous_end_index = -1;
while (manager->NextAtGranularity(granularity, end_index, android_node,
&start_index, &end_index)) {
int len = end_index - start_index;
std::u16string selection = text.substr(start_index, len);
if (base::EndsWith(selection, u"\n",
base::CompareCase::INSENSITIVE_ASCII)) {
selection.erase(selection.size() - 1);
}
if (!selection.empty()) {
if (!concatenated.empty()) {
concatenated += u", ";
}
concatenated += u"'" + selection + u"'";
}
// Prevent an endless loop.
if (end_index == previous_end_index) {
LOG(ERROR) << "Bailing from loop, NextAtGranularity didn't advance";
break;
}
previous_end_index = end_index;
}
std::u16string reverse;
previous_end_index = -1;
start_index = end_index;
while (manager->PreviousAtGranularity(
granularity, start_index, android_node, &start_index, &end_index)) {
int len = end_index - start_index;
std::u16string selection = text.substr(start_index, len);
if (base::EndsWith(selection, u"\n",
base::CompareCase::INSENSITIVE_ASCII)) {
selection = selection.substr(0, selection.size() - 1);
}
if (!reverse.empty()) {
reverse = u", " + reverse;
}
reverse = u"'" + selection + u"'" + reverse;
// Prevent an endless loop.
if (end_index == previous_end_index) {
LOG(ERROR) << "Bailing from loop, PreviousAtGranularity didn't advance";
break;
}
previous_end_index = end_index;
}
if (concatenated != reverse) {
LOG(ERROR) << "Did not get the same sequence in the forwards and "
<< "reverse directions!";
LOG(ERROR) << "Forwards: " << concatenated;
LOG(ERROR) << "Backwards " << reverse;
return std::u16string();
}
return concatenated;
}
private:
std::optional<ScopedAccessibilityModeOverride> accessibility_mode_;
};
IN_PROC_BROWSER_TEST_F(AndroidGranularityMovementBrowserTest,
NavigateByCharacters) {
GURL url(
"data:text/html,"
"<body>"
"<p>One, two, three!</p>"
"<p>"
"<button aria-label='Seven, eight, nine!'>Four, five, six!</button>"
"</p>"
"</body></html>");
ui::BrowserAccessibility* root = LoadUrlAndGetAccessibilityRoot(url);
ASSERT_EQ(2U, root->PlatformChildCount());
ui::BrowserAccessibility* para = root->PlatformGetChild(0);
ASSERT_EQ(0U, para->PlatformChildCount());
ui::BrowserAccessibility* button_container = root->PlatformGetChild(1);
ASSERT_EQ(1U, button_container->PlatformChildCount());
ui::BrowserAccessibility* button = button_container->PlatformGetChild(0);
ASSERT_EQ(0U, button->PlatformChildCount());
EXPECT_EQ(
u"'O', 'n', 'e', ',', ' ', 't', 'w', 'o', "
u"',', ' ', 't', 'h', 'r', 'e', 'e', '!'",
TraverseNodeAtGranularity(para, GRANULARITY_CHARACTER));
EXPECT_EQ(
u"'S', 'e', 'v', 'e', 'n', ',', ' ', 'e', 'i', 'g', "
u"'h', 't', ',', ' ', 'n', 'i', 'n', 'e', '!'",
TraverseNodeAtGranularity(button, GRANULARITY_CHARACTER));
}
IN_PROC_BROWSER_TEST_F(AndroidGranularityMovementBrowserTest, NavigateByWords) {
GURL url(
"data:text/html,"
"<body>"
"<p>One, two, three!</p>"
"<p>"
"<button aria-label='Seven, eight, nine!'>Four, five, six!</button>"
"</p>"
"</body></html>");
ui::BrowserAccessibility* root = LoadUrlAndGetAccessibilityRoot(url);
ASSERT_EQ(2U, root->PlatformChildCount());
ui::BrowserAccessibility* para = root->PlatformGetChild(0);
ASSERT_EQ(0U, para->PlatformChildCount());
ui::BrowserAccessibility* button_container = root->PlatformGetChild(1);
ASSERT_EQ(1U, button_container->PlatformChildCount());
ui::BrowserAccessibility* button = button_container->PlatformGetChild(0);
ASSERT_EQ(0U, button->PlatformChildCount());
EXPECT_EQ(u"'One', ',', 'two', ',', 'three', '!'",
TraverseNodeAtGranularity(para, GRANULARITY_WORD));
EXPECT_EQ(u"'Seven', 'eight', 'nine'",
TraverseNodeAtGranularity(button, GRANULARITY_WORD));
}
IN_PROC_BROWSER_TEST_F(AndroidGranularityMovementBrowserTest, NavigateByLine) {
GURL url(
"data:text/html,"
"<body>"
"<pre>One,%0dtwo,%0dthree!</pre>"
"</body>");
ui::BrowserAccessibility* root = LoadUrlAndGetAccessibilityRoot(url);
ASSERT_EQ(1U, root->PlatformChildCount());
ui::BrowserAccessibility* pre = root->PlatformGetChild(0);
ASSERT_EQ(0U, pre->PlatformChildCount());
EXPECT_EQ(u"'One,', 'two,', 'three!'",
TraverseNodeAtGranularity(pre, GRANULARITY_LINE));
}
} // namespace content
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