root/chrome/test/chromedriver/element_util.cc

DEFINITIONS

1. ParseFromValue
2. ParseFromValue
3. ParseFromValue
4. CreateValueFrom
5. CallAtomsJs
6. VerifyElementClickable
7. ScrollElementRegionIntoViewHelper
8. GetElementEffectiveStyle
9. GetElementBorder
10. CreateElement
11. CreateValueFrom
12. FindElement
13. GetActiveElement
14. IsElementFocused
15. GetElementAttribute
16. IsElementAttributeEqualToIgnoreCase
17. GetElementClickableLocation
18. GetElementEffectiveStyle
19. GetElementRegion
20. GetElementTagName
21. GetElementSize
22. IsElementDisplayed
23. IsElementEnabled
24. IsOptionElementSelected
25. IsOptionElementTogglable
26. SetOptionElementSelected
27. ToggleOptionElement
28. ScrollElementIntoView
29. ScrollElementRegionIntoView

// Copyright (c) 2013 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 "chrome/test/chromedriver/element_util.h"

#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "base/values.h"
#include "chrome/test/chromedriver/basic_types.h"
#include "chrome/test/chromedriver/chrome/chrome.h"
#include "chrome/test/chromedriver/chrome/js.h"
#include "chrome/test/chromedriver/chrome/status.h"
#include "chrome/test/chromedriver/chrome/web_view.h"
#include "chrome/test/chromedriver/session.h"
#include "third_party/webdriver/atoms.h"

namespace {

const char kElementKey[] = "ELEMENT";

bool ParseFromValue(base::Value* value, WebPoint* point) {
  base::DictionaryValue* dict_value;
  if (!value->GetAsDictionary(&dict_value))
    return false;
  double x, y;
  if (!dict_value->GetDouble("x", &x) ||
      !dict_value->GetDouble("y", &y))
    return false;
  point->x = static_cast<int>(x);
  point->y = static_cast<int>(y);
  return true;
}

bool ParseFromValue(base::Value* value, WebSize* size) {
  base::DictionaryValue* dict_value;
  if (!value->GetAsDictionary(&dict_value))
    return false;
  double width, height;
  if (!dict_value->GetDouble("width", &width) ||
      !dict_value->GetDouble("height", &height))
    return false;
  size->width = static_cast<int>(width);
  size->height = static_cast<int>(height);
  return true;
}

bool ParseFromValue(base::Value* value, WebRect* rect) {
  base::DictionaryValue* dict_value;
  if (!value->GetAsDictionary(&dict_value))
    return false;
  double x, y, width, height;
  if (!dict_value->GetDouble("left", &x) ||
      !dict_value->GetDouble("top", &y) ||
      !dict_value->GetDouble("width", &width) ||
      !dict_value->GetDouble("height", &height))
    return false;
  rect->origin.x = static_cast<int>(x);
  rect->origin.y = static_cast<int>(y);
  rect->size.width = static_cast<int>(width);
  rect->size.height = static_cast<int>(height);
  return true;
}

base::Value* CreateValueFrom(const WebRect& rect) {
  base::DictionaryValue* dict = new base::DictionaryValue();
  dict->SetInteger("left", rect.X());
  dict->SetInteger("top", rect.Y());
  dict->SetInteger("width", rect.Width());
  dict->SetInteger("height", rect.Height());
  return dict;
}

Status CallAtomsJs(
    const std::string& frame,
    WebView* web_view,
    const char* const* atom_function,
    const base::ListValue& args,
    scoped_ptr<base::Value>* result) {
  return web_view->CallFunction(
      frame, webdriver::atoms::asString(atom_function), args, result);
}

Status VerifyElementClickable(
    const std::string& frame,
    WebView* web_view,
    const std::string& element_id,
    const WebPoint& location) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  args.Append(CreateValueFrom(location));
  scoped_ptr<base::Value> result;
  Status status = CallAtomsJs(
      frame, web_view, webdriver::atoms::IS_ELEMENT_CLICKABLE,
      args, &result);
  if (status.IsError())
    return status;
  base::DictionaryValue* dict;
  bool is_clickable;
  if (!result->GetAsDictionary(&dict) ||
      !dict->GetBoolean("clickable", &is_clickable)) {
    return Status(kUnknownError,
                  "failed to parse value of IS_ELEMENT_CLICKABLE");
  }

  if (!is_clickable) {
    std::string message;
    if (!dict->GetString("message", &message))
      message = "element is not clickable";
    return Status(kUnknownError, message);
  }
  return Status(kOk);
}

Status ScrollElementRegionIntoViewHelper(
    const std::string& frame,
    WebView* web_view,
    const std::string& element_id,
    const WebRect& region,
    bool center,
    const std::string& clickable_element_id,
    WebPoint* location) {
  WebPoint tmp_location = *location;
  base::ListValue args;
  args.Append(CreateElement(element_id));
  args.AppendBoolean(center);
  args.Append(CreateValueFrom(region));
  scoped_ptr<base::Value> result;
  Status status = web_view->CallFunction(
      frame, webdriver::atoms::asString(webdriver::atoms::GET_LOCATION_IN_VIEW),
      args, &result);
  if (status.IsError())
    return status;
  if (!ParseFromValue(result.get(), &tmp_location)) {
    return Status(kUnknownError,
                  "failed to parse value of GET_LOCATION_IN_VIEW");
  }
  if (!clickable_element_id.empty()) {
    WebPoint middle = tmp_location;
    middle.Offset(region.Width() / 2, region.Height() / 2);
    status = VerifyElementClickable(
        frame, web_view, clickable_element_id, middle);
    if (status.IsError())
      return status;
  }
  *location = tmp_location;
  return Status(kOk);
}

Status GetElementEffectiveStyle(
    const std::string& frame,
    WebView* web_view,
    const std::string& element_id,
    const std::string& property,
    std::string* value) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  args.AppendString(property);
  scoped_ptr<base::Value> result;
  Status status = web_view->CallFunction(
      frame, webdriver::atoms::asString(webdriver::atoms::GET_EFFECTIVE_STYLE),
      args, &result);
  if (status.IsError())
    return status;
  if (!result->GetAsString(value)) {
    return Status(kUnknownError,
                  "failed to parse value of GET_EFFECTIVE_STYLE");
  }
  return Status(kOk);
}

Status GetElementBorder(
    const std::string& frame,
    WebView* web_view,
    const std::string& element_id,
    int* border_left,
    int* border_top) {
  std::string border_left_str;
  Status status = GetElementEffectiveStyle(
      frame, web_view, element_id, "border-left-width", &border_left_str);
  if (status.IsError())
    return status;
  std::string border_top_str;
  status = GetElementEffectiveStyle(
      frame, web_view, element_id, "border-top-width", &border_top_str);
  if (status.IsError())
    return status;
  int border_left_tmp = -1;
  int border_top_tmp = -1;
  base::StringToInt(border_left_str, &border_left_tmp);
  base::StringToInt(border_top_str, &border_top_tmp);
  if (border_left_tmp == -1 || border_top_tmp == -1)
    return Status(kUnknownError, "failed to get border width of element");
  *border_left = border_left_tmp;
  *border_top = border_top_tmp;
  return Status(kOk);
}

}  // namespace

base::DictionaryValue* CreateElement(const std::string& element_id) {
  base::DictionaryValue* element = new base::DictionaryValue();
  element->SetString(kElementKey, element_id);
  return element;
}

base::Value* CreateValueFrom(const WebPoint& point) {
  base::DictionaryValue* dict = new base::DictionaryValue();
  dict->SetInteger("x", point.x);
  dict->SetInteger("y", point.y);
  return dict;
}

Status FindElement(
    int interval_ms,
    bool only_one,
    const std::string* root_element_id,
    Session* session,
    WebView* web_view,
    const base::DictionaryValue& params,
    scoped_ptr<base::Value>* value) {
  std::string strategy;
  if (!params.GetString("using", &strategy))
    return Status(kUnknownError, "'using' must be a string");
  std::string target;
  if (!params.GetString("value", &target))
    return Status(kUnknownError, "'value' must be a string");

  std::string script;
  if (only_one)
    script = webdriver::atoms::asString(webdriver::atoms::FIND_ELEMENT);
  else
    script = webdriver::atoms::asString(webdriver::atoms::FIND_ELEMENTS);
  scoped_ptr<base::DictionaryValue> locator(new base::DictionaryValue());
  locator->SetString(strategy, target);
  base::ListValue arguments;
  arguments.Append(locator.release());
  if (root_element_id)
    arguments.Append(CreateElement(*root_element_id));

  base::TimeTicks start_time = base::TimeTicks::Now();
  while (true) {
    scoped_ptr<base::Value> temp;
    Status status = web_view->CallFunction(
        session->GetCurrentFrameId(), script, arguments, &temp);
    if (status.IsError())
      return status;

    if (!temp->IsType(base::Value::TYPE_NULL)) {
      if (only_one) {
        value->reset(temp.release());
        return Status(kOk);
      } else {
        base::ListValue* result;
        if (!temp->GetAsList(&result))
          return Status(kUnknownError, "script returns unexpected result");

        if (result->GetSize() > 0U) {
          value->reset(temp.release());
          return Status(kOk);
        }
      }
    }

    if (base::TimeTicks::Now() - start_time >= session->implicit_wait) {
      if (only_one) {
        return Status(kNoSuchElement);
      } else {
        value->reset(new base::ListValue());
        return Status(kOk);
      }
    }
    base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(interval_ms));
  }

  return Status(kUnknownError);
}

Status GetActiveElement(
    Session* session,
    WebView* web_view,
    scoped_ptr<base::Value>* value) {
  base::ListValue args;
  return web_view->CallFunction(
      session->GetCurrentFrameId(),
      "function() { return document.activeElement || document.body }",
      args,
      value);
}

Status IsElementFocused(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    bool* is_focused) {
  scoped_ptr<base::Value> result;
  Status status = GetActiveElement(session, web_view, &result);
  if (status.IsError())
    return status;
  scoped_ptr<base::Value> element_dict(CreateElement(element_id));
  *is_focused = result->Equals(element_dict.get());
  return Status(kOk);
}

Status GetElementAttribute(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    const std::string& attribute_name,
    scoped_ptr<base::Value>* value) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  args.AppendString(attribute_name);
  return CallAtomsJs(
      session->GetCurrentFrameId(), web_view, webdriver::atoms::GET_ATTRIBUTE,
      args, value);
}

Status IsElementAttributeEqualToIgnoreCase(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    const std::string& attribute_name,
    const std::string& attribute_value,
    bool* is_equal) {
  scoped_ptr<base::Value> result;
  Status status = GetElementAttribute(
      session, web_view, element_id, attribute_name, &result);
  if (status.IsError())
    return status;
  std::string actual_value;
  if (result->GetAsString(&actual_value))
    *is_equal = LowerCaseEqualsASCII(actual_value, attribute_value.c_str());
  else
    *is_equal = false;
  return status;
}

Status GetElementClickableLocation(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    WebPoint* location) {
  std::string tag_name;
  Status status = GetElementTagName(session, web_view, element_id, &tag_name);
  if (status.IsError())
    return status;
  std::string target_element_id = element_id;
  if (tag_name == "area") {
    // Scroll the image into view instead of the area.
    const char* kGetImageElementForArea =
        "function (element) {"
        "  var map = element.parentElement;"
        "  if (map.tagName.toLowerCase() != 'map')"
        "    throw new Error('the area is not within a map');"
        "  var mapName = map.getAttribute('name');"
        "  if (mapName == null)"
        "    throw new Error ('area\\'s parent map must have a name');"
        "  mapName = '#' + mapName.toLowerCase();"
        "  var images = document.getElementsByTagName('img');"
        "  for (var i = 0; i < images.length; i++) {"
        "    if (images[i].useMap.toLowerCase() == mapName)"
        "      return images[i];"
        "  }"
        "  throw new Error('no img is found for the area');"
        "}";
    base::ListValue args;
    args.Append(CreateElement(element_id));
    scoped_ptr<base::Value> result;
    status = web_view->CallFunction(
        session->GetCurrentFrameId(), kGetImageElementForArea, args, &result);
    if (status.IsError())
      return status;
    const base::DictionaryValue* element_dict;
    if (!result->GetAsDictionary(&element_dict) ||
        !element_dict->GetString(kElementKey, &target_element_id))
      return Status(kUnknownError, "no element reference returned by script");
  }
  bool is_displayed = false;
  status = IsElementDisplayed(
      session, web_view, target_element_id, true, &is_displayed);
  if (status.IsError())
    return status;
  if (!is_displayed)
    return Status(kElementNotVisible);

  WebRect rect;
  status = GetElementRegion(session, web_view, element_id, &rect);
  if (status.IsError())
    return status;

  std::string tmp_element_id = element_id;
  if (tag_name == "area" && session->chrome->GetBuildNo() < 1799 &&
      session->chrome->GetBuildNo() >= 1666) {
    // This is to skip clickable verification for <area>.
    // The problem is caused by document.ElementFromPoint(crbug.com/338601).
    // It was introduced by blink r159012, which rolled into chromium r227489.
    // And it was fixed in blink r165426, which rolled into chromium r245994.
    // TODO(stgao): Revert after 33 is not supported.
    tmp_element_id = std::string();
  }

  status = ScrollElementRegionIntoView(
      session, web_view, target_element_id, rect,
      true /* center */, tmp_element_id, location);
  if (status.IsError())
    return status;
  location->Offset(rect.Width() / 2, rect.Height() / 2);
  return Status(kOk);
}

Status GetElementEffectiveStyle(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    const std::string& property_name,
    std::string* property_value) {
  return GetElementEffectiveStyle(session->GetCurrentFrameId(), web_view,
                                  element_id, property_name, property_value);
}

Status GetElementRegion(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    WebRect* rect) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  scoped_ptr<base::Value> result;
  Status status = web_view->CallFunction(
      session->GetCurrentFrameId(), kGetElementRegionScript, args, &result);
  if (status.IsError())
    return status;
  if (!ParseFromValue(result.get(), rect)) {
    return Status(kUnknownError,
                  "failed to parse value of getElementRegion");
  }
  return Status(kOk);
}

Status GetElementTagName(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    std::string* name) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  scoped_ptr<base::Value> result;
  Status status = web_view->CallFunction(
      session->GetCurrentFrameId(),
      "function(elem) { return elem.tagName.toLowerCase(); }",
      args, &result);
  if (status.IsError())
    return status;
  if (!result->GetAsString(name))
    return Status(kUnknownError, "failed to get element tag name");
  return Status(kOk);
}

Status GetElementSize(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    WebSize* size) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  scoped_ptr<base::Value> result;
  Status status = CallAtomsJs(
      session->GetCurrentFrameId(), web_view, webdriver::atoms::GET_SIZE,
      args, &result);
  if (status.IsError())
    return status;
  if (!ParseFromValue(result.get(), size))
    return Status(kUnknownError, "failed to parse value of GET_SIZE");
  return Status(kOk);
}

Status IsElementDisplayed(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    bool ignore_opacity,
    bool* is_displayed) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  args.AppendBoolean(ignore_opacity);
  scoped_ptr<base::Value> result;
  Status status = CallAtomsJs(
      session->GetCurrentFrameId(), web_view, webdriver::atoms::IS_DISPLAYED,
      args, &result);
  if (status.IsError())
    return status;
  if (!result->GetAsBoolean(is_displayed))
    return Status(kUnknownError, "IS_DISPLAYED should return a boolean value");
  return Status(kOk);
}

Status IsElementEnabled(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    bool* is_enabled) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  scoped_ptr<base::Value> result;
  Status status = CallAtomsJs(
      session->GetCurrentFrameId(), web_view, webdriver::atoms::IS_ENABLED,
      args, &result);
  if (status.IsError())
    return status;
  if (!result->GetAsBoolean(is_enabled))
    return Status(kUnknownError, "IS_ENABLED should return a boolean value");
  return Status(kOk);
}

Status IsOptionElementSelected(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    bool* is_selected) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  scoped_ptr<base::Value> result;
  Status status = CallAtomsJs(
      session->GetCurrentFrameId(), web_view, webdriver::atoms::IS_SELECTED,
      args, &result);
  if (status.IsError())
    return status;
  if (!result->GetAsBoolean(is_selected))
    return Status(kUnknownError, "IS_SELECTED should return a boolean value");
  return Status(kOk);
}

Status IsOptionElementTogglable(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    bool* is_togglable) {
  base::ListValue args;
  args.Append(CreateElement(element_id));
  scoped_ptr<base::Value> result;
  Status status = web_view->CallFunction(
      session->GetCurrentFrameId(), kIsOptionElementToggleableScript,
      args, &result);
  if (status.IsError())
    return status;
  if (!result->GetAsBoolean(is_togglable))
    return Status(kUnknownError, "failed check if option togglable or not");
  return Status(kOk);
}

Status SetOptionElementSelected(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    bool selected) {
  // TODO(171034): need to fix throwing error if an alert is triggered.
  base::ListValue args;
  args.Append(CreateElement(element_id));
  args.AppendBoolean(selected);
  scoped_ptr<base::Value> result;
  return CallAtomsJs(
      session->GetCurrentFrameId(), web_view, webdriver::atoms::CLICK,
      args, &result);
}

Status ToggleOptionElement(
    Session* session,
    WebView* web_view,
    const std::string& element_id) {
  bool is_selected;
  Status status = IsOptionElementSelected(
      session, web_view, element_id, &is_selected);
  if (status.IsError())
    return status;
  return SetOptionElementSelected(session, web_view, element_id, !is_selected);
}

Status ScrollElementIntoView(
    Session* session,
    WebView* web_view,
    const std::string& id,
    WebPoint* location) {
  WebSize size;
  Status status = GetElementSize(session, web_view, id, &size);
  if (status.IsError())
    return status;
  return ScrollElementRegionIntoView(
      session, web_view, id, WebRect(WebPoint(0, 0), size),
      false /* center */, std::string(), location);
}

Status ScrollElementRegionIntoView(
    Session* session,
    WebView* web_view,
    const std::string& element_id,
    const WebRect& region,
    bool center,
    const std::string& clickable_element_id,
    WebPoint* location) {
  WebPoint region_offset = region.origin;
  WebSize region_size = region.size;
  Status status = ScrollElementRegionIntoViewHelper(
      session->GetCurrentFrameId(), web_view, element_id, region,
      center, clickable_element_id, &region_offset);
  if (status.IsError())
    return status;
  const char* kFindSubFrameScript =
      "function(xpath) {"
      "  return document.evaluate(xpath, document, null,"
      "      XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;"
      "}";
  for (std::list<FrameInfo>::reverse_iterator rit = session->frames.rbegin();
       rit != session->frames.rend(); ++rit) {
    base::ListValue args;
    args.AppendString(
        base::StringPrintf("//*[@cd_frame_id_ = '%s']",
                           rit->chromedriver_frame_id.c_str()));
    scoped_ptr<base::Value> result;
    status = web_view->CallFunction(
        rit->parent_frame_id, kFindSubFrameScript, args, &result);
    if (status.IsError())
      return status;
    const base::DictionaryValue* element_dict;
    if (!result->GetAsDictionary(&element_dict))
      return Status(kUnknownError, "no element reference returned by script");
    std::string frame_element_id;
    if (!element_dict->GetString(kElementKey, &frame_element_id))
      return Status(kUnknownError, "failed to locate a sub frame");

    // Modify |region_offset| by the frame's border.
    int border_left = -1;
    int border_top = -1;
    status = GetElementBorder(
        rit->parent_frame_id, web_view, frame_element_id,
        &border_left, &border_top);
    if (status.IsError())
      return status;
    region_offset.Offset(border_left, border_top);

    status = ScrollElementRegionIntoViewHelper(
        rit->parent_frame_id, web_view, frame_element_id,
        WebRect(region_offset, region_size),
        center, frame_element_id, &region_offset);
    if (status.IsError())
      return status;
  }
  *location = region_offset;
  return Status(kOk);
}