Update json_schema_compiler to handle the Automation extension API

tools/json_schema_compiler/js_externs_generator.py

 # Copyright 2015 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.
 """
 Generator that produces an externs file for the Closure Compiler.
 Note: This is a work in progress, and generated externs may require tweaking.
 
 See https://developers.google.com/closure/compiler/docs/api-tutorial3#externs
 """
 
@@ skipping 12 matching lines @@
 // See https://chromium.googlesource.com/chromium/src/+/master/docs/closure_compilation.md
 """
 
 class JsExternsGenerator(object):
   def Generate(self, namespace):
     return _Generator(namespace).Generate()
 
 class _Generator(object):
   def __init__(self, namespace):
     self._namespace = namespace
+    self._class_name = None
     self._js_util = JsUtil()
 
   def Generate(self):
     """Generates a Code object with the schema for the entire namespace.
     """
     c = Code()
     (c.Append(self._GetHeader(sys.argv[0], self._namespace.name))
       .Append())
 
     self._AppendNamespaceObject(c)
@@ skipping 29 matching lines @@
     c.Append()
 
   def _AppendEnumJsDoc(self, c, js_type):
     """ Given an Enum Type object, generates the Code for the enum's definition.
     """
     (c.Sblock(line='/**', line_prefix=' * ')
       .Append('@enum {string}')
       .Append(self._js_util.GetSeeLink(self._namespace.name, 'type',
                                        js_type.simple_name))
       .Eblock(' */'))
-    c.Append('chrome.%s.%s = {' % (self._namespace.name, js_type.name))
+    c.Append('%s.%s = {' % (self._GetNamespace(), js_type.name))
 
     def get_property_name(e):
       # Enum properties are normified to be in ALL_CAPS_STYLE.
       # Assume enum '1ring-rulesThemAll'.
       # Transform to '1ring-rules_Them_All'.
       e = re.sub(r'([a-z])([A-Z])', r'\1_\2', e)
       # Transform to '1ring_rules_Them_All'.
       e = re.sub(r'\W', '_', e)
       # Transform to '_1ring_rules_Them_All'.
       e = re.sub(r'^(\d)', r'_\1', e)
       # Transform to '_1RING_RULES_THEM_ALL'.
       return e.upper()
 
     c.Append('\n'.join(
         ["  %s: '%s'," % (get_property_name(v.name), v.name)
             for v in js_type.enum_values]))
     c.Append('};')
 
   def _IsTypeConstructor(self, js_type):
     """Returns true if the given type should be a @constructor. If this returns
        false, the type is a typedef.
     """
     return any(prop.type_.property_type is PropertyType.FUNCTION
                for prop in js_type.properties.values())
 
-  def _AppendTypeJsDoc(self, c, js_type):
+  def _AppendTypeJsDoc(self, c, js_type, optional=False):
     """Appends the documentation for a type as a Code.
     """
     c.Sblock(line='/**', line_prefix=' * ')
 
     if js_type.description:
       for line in js_type.description.splitlines():
         c.Append(line)
 
+    if js_type.jsexterns:
+      for line in js_type.jsexterns.splitlines():
+        c.Append(line)
+
     is_constructor = self._IsTypeConstructor(js_type)
-    if is_constructor:
-      c.Comment('@constructor', comment_prefix = ' * ', wrap_indent=4)
+    if js_type.property_type is not PropertyType.OBJECT:
+      self._js_util.AppendTypeJsDoc(c, self._namespace.name, js_type, optional)
+    elif is_constructor:
+      c.Comment('@constructor', comment_prefix = '', wrap_indent=4)
+      c.Comment('@private', comment_prefix = '', wrap_indent=4)
     else:
       self._AppendTypedef(c, js_type.properties)
 
     c.Append(self._js_util.GetSeeLink(self._namespace.name, 'type',
                                       js_type.simple_name))
     c.Eblock(' */')
 
-    var = 'chrome.%s.%s' % (js_type.namespace.name, js_type.simple_name)
+    var = '%s.%s' % (self._GetNamespace(), js_type.simple_name)
     if is_constructor: var += ' = function() {}'
     var += ';'
     c.Append(var)
 
+    if is_constructor:
+      c.Append()
+      self._class_name = js_type.name
+      for prop in js_type.properties.values():
+        if prop.type_.property_type is PropertyType.FUNCTION:
+          self._AppendFunction(c, prop.type_.function)
+        else:
+          self._AppendTypeJsDoc(c, prop.type_, prop.optional)
+          c.Append()
+      self._class_name = None
+
   def _AppendTypedef(self, c, properties):
     """Given an OrderedDict of properties, Appends code containing a @typedef.
     """
     if not properties: return
 
     c.Append('@typedef {')
     self._js_util.AppendObjectDefinition(c, self._namespace.name, properties,
                                          new_line=False)
     c.Append('}', new_line=False)
 
   def _AppendFunction(self, c, function):
     """Appends the code representing a function, including its documentation.
        For example:
 
        /**
         * @param {string} title The new title.
         */
        chrome.window.setTitle = function(title) {};
     """
     self._js_util.AppendFunctionJsDoc(c, self._namespace.name, function)
     params = self._GetFunctionParams(function)
-    c.Append('chrome.%s.%s = function(%s) {};' % (self._namespace.name,
-                                                  function.name, params))
+    c.Append('%s.%s = function(%s) {};' % (self._GetNamespace(),
+                                           function.name, params))
     c.Append()
 
   def _AppendEvent(self, c, event):
     """Appends the code representing an event.
        For example:
 
        /** @type {!ChromeEvent} */
        chrome.bookmarks.onChildrenReordered;
     """
     c.Sblock(line='/**', line_prefix=' * ')
     if (event.description):
       c.Comment(event.description, comment_prefix='')
     c.Append('@type {!ChromeEvent}')
     c.Append(self._js_util.GetSeeLink(self._namespace.name, 'event',
                                       event.name))
     c.Eblock(' */')
-    c.Append('chrome.%s.%s;' % (self._namespace.name, event.name))
+    c.Append('%s.%s;' % (self._GetNamespace(), event.name))
     c.Append()
 
   def _AppendNamespaceObject(self, c):
     """Appends the code creating namespace object.
        For example:
 
        /**
         * @const
         */
        chrome.bookmarks = {};
     """
     c.Append("""/**
  * @const
  */""")
     c.Append('chrome.%s = {};' % self._namespace.name)
     c.Append()
 
   def _GetFunctionParams(self, function):
     """Returns the function params string for function.
     """
     params = function.params[:]
     if function.callback:
       params.append(function.callback)
     return ', '.join(param.name for param in params)
+
+  def _GetNamespace(self):
+    """Returns the namespace to be prepended to a top-level typedef.
+
+       For example, it might return "chrome.namespace".
+
+       Also optionally includes the class name if this is in the context
+       of outputting the members of a class.
+
+       For example, "chrome.namespace.ClassName.prototype"
+    """
+    if self._class_name:
+      return 'chrome.%s.%s.prototype' % (self._namespace.name, self._class_name)
+    return 'chrome.%s' % self._namespace.name