Presubmit checks for user actions intorduced in HTML files.

chrome/browser/resources/PRESUBMIT.py

Index: chrome/browser/resources/PRESUBMIT.py
diff --git a/chrome/browser/resources/PRESUBMIT.py b/chrome/browser/resources/PRESUBMIT.py
new file mode 100644
index 0000000000000000000000000000000000000000..0aa7b9671fe518e3a8c2a139a3317fd711ff70a5
--- /dev/null
+++ b/chrome/browser/resources/PRESUBMIT.py
@@ -0,0 +1,95 @@
+# Copyright 2014 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.
+
+"""Presubmit script for HTML files in chrome/browser/resources.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into gcl.
+"""
+
+ACTION_XML_PATH = '../../../tools/metrics/actions/actions.xml'
+
+def CheckUserActionUpdate(input_api, output_api, action_xml_path):
+  """Checks if any new user action has been added."""
+  if any('actions.xml' == input_api.os_path.basename(f.LocalPath()) for f in
+         input_api.AffectedFiles()):
+    # If actions.xml is already included in the changelist, the PRESUBMIT
+    # for actions.xml will do a more complete presubmit check.
+    return []
+
+  file_filter = lambda f: f.LocalPath().endswith('.html')
+  action_re = r'(^|\s+)metric\s*=\s*"([^ ]*)"'
+  current_actions = None
+  for f in input_api.AffectedFiles(file_filter=file_filter):
+    for line_num, line in f.ChangedContents():
+      match = input_api.re.search(action_re, line)
+      if match:
+        # Loads contents in tools/metrics/actions/actions.xml to memory. It's
+        # loaded only once.
+        if not current_actions:
+          with open(action_xml_path) as actions_f:
+            current_actions = actions_f.read()
+
+        metric_name = match.group(2)
+        is_boolean = IsBoolean(f.NewContents(), metric_name, input_api)
+
+        # Search for the matched user action name in |current_actions|.
+        if not IsActionPresent(current_actions, metric_name, is_boolean):
+          return [output_api.PresubmitPromptWarning(
+            'File %s line %d: %s is missing in '
+            'tools/metrics/actions/actions.xml. Please run '
+            'tools/metrics/actions/extract_actions.py to update.'
+            % (f.LocalPath(), line_num, metric_name), [])]
+  return []
+
+
+def IsActionPresent(current_actions, metric_name, is_boolean):
+  """Checks if metric_name is defined in the actions file.
+
+  Checks whether there's matching entries in an actions.xml file for the given
+  |metric_name|, depending on whether it is a boolean action.
+
+  Args:
+    current_actions: The content of the actions.xml file.
+    metric_name: The name for which the check should be done.
+    is_boolean: Whether the action comes from a boolean control.
+  """
+  if not is_boolean:
+    action = 'name="{0}"'.format(metric_name)
+    return action in current_actions
+
+  action_disabled = 'name="{0}_Disabled"'.format(metric_name)
+  action_enabled = 'name="{0}_Enabled"'.format(metric_name)
+
+  return (action_disabled in current_actions and
+      action_enabled in current_actions)
+
+
+def IsBoolean(new_content_lines, metric_name, input_api):
+  """Check whether action defined in the changed code is boolean or not.
+
+  Checks whether the action comes from boolean control based on the HTML
+  elements attributes.
+
+  Args:
+    new_content_lines: List of changed lines.
+    metric_name: The  name for which the check should be done.
+  """
+  new_content = '\n'.join(new_content_lines)
+
+  html_element_re = r'<(.*?)(^|\s+)metric\s*=\s*"%s"(.*?)>' % (metric_name)
+  type_re = (r'datatype="boolean"|type="checkbox"|type="radio".*?'
+      'value=("true"|"false")')
+
+  match = input_api.re.search(html_element_re, new_content)
+  return (match and
+      any(input_api.re.search(type_re, match.group(i)) for i in (1, 3)))
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return CheckUserActionUpdate(input_api, output_api, ACTION_XML_PATH)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return CheckUserActionUpdate(input_api, output_api, ACTION_XML_PATH)