Move html events generation to domimpl.

lib/dom/scripts/systemnative.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for the systems to generate
 native binding from the IDL database."""
 
 import emitter
 import os
 from generator import *
 from systembase import *
+from systemhtml import DomToHtmlEvent, DomToHtmlEvents
 
 class NativeImplementationSystem(System):
 
-  def __init__(self, templates, database, emitters, auxiliary_dir, output_dir):
+  def __init__(self, templates, database, html_renames, emitters, auxiliary_dir,
+               output_dir):
     super(NativeImplementationSystem, self).__init__(
         templates, database, emitters, output_dir)
 
+    self._html_renames = html_renames
     self._auxiliary_dir = auxiliary_dir
     self._dom_public_files = []
     self._dom_impl_files = []
     self._cpp_header_files = []
     self._cpp_impl_files = []
 
   def InterfaceGenerator(self,
                          interface,
                          common_prefix,
                          super_interface_name,
@@ skipping 208 matching lines @@
   def StartInterface(self):
     self._class_name = self._ImplClassName(self._interface.id)
     self._interface_type_info = GetIDLTypeInfo(self._interface.id)
     self._members_emitter = emitter.Emitter()
     self._cpp_declarations_emitter = emitter.Emitter()
     self._cpp_impl_includes = set()
     self._cpp_definitions_emitter = emitter.Emitter()
     self._cpp_resolver_emitter = emitter.Emitter()
 
     self._GenerateConstructors()
+    self._GenerateEvents()
 
   def _GenerateConstructors(self):
     if not self._IsConstructable():
       return
 
     # TODO(antonm): currently we don't have information about number of arguments expected by
     # the constructor, so name only dispatch.
     self._cpp_resolver_emitter.Emit(
         '    if (name == "$(INTERFACE_NAME)_constructor_Callback")\n'
         '        return Dart$(INTERFACE_NAME)Internal::constructorCallback;\n',
@@ skipping 49 matching lines @@
       arguments.append(argument_expression)
 
     function_expression = '%s::%s' % (self._interface_type_info.native_type(), create_function)
     invocation = self._GenerateWebCoreInvocation(function_expression, arguments,
         self._interface.id, self._interface.ext_attrs, raises_dom_exceptions)
     self._GenerateNativeCallback(callback_name='constructorCallback',
         parameter_definitions=parameter_definitions_emitter.Fragments(),
         needs_receiver=False, invocation=invocation,
         raises_exceptions=raises_exceptions)
 
+  def _GenerateEvents(self):
+    if self._interface.id == 'DocumentFragment':

[Anton Muhin, 2012/05/16 13:17:57]

may you add a comment why this is special-cased?

[podivilov, 2012/05/16 15:19:44]

Done.

+      self._EmitEventGetter('ElementEventsImplementation')
+      return
+
+    events_attributes =  [attr for attr in self._interface.attributes
+                          if attr.type.id == 'EventListener']
+    if not 'EventTarget' in self._interface.ext_attrs and not events_attributes:
+      return
+

[Anton Muhin, 2012/05/16 13:17:57]

nit: intentional two blanks?

[podivilov, 2012/05/16 15:19:44]

Done.

+
+    def is_event_target(interface):

[Anton Muhin, 2012/05/16 13:17:57]

q: is it a correct style for nest functions?  just asking

[podivilov, 2012/05/16 15:19:44]

Done.

+      return ('EventTarget' in interface.ext_attrs and
+              interface.id != 'EventTarget')
+    is_root = not _FindParent(self._interface, self._system._database, is_event_target)
+    if is_root:
+      self._members_emitter.Emit('  EventsImplementation _on;\n')
+
+    if not events_attributes:
+      if is_root:
+        self._EmitEventGetter('EventsImplementation')
+      return
+
+    events_class = '%sEventsImplementation' % self._interface.id
+    self._EmitEventGetter(events_class)
+
+    def has_event_attributes(interface):
+      for attribute in interface.attributes:

[Anton Muhin, 2012/05/16 13:17:57]

as a variant: return any((attr.type.id == 'EventListener' for attr in
interface.attributes))

[podivilov, 2012/05/16 15:19:44]

Done.

+        if attribute.type.id == 'EventListener':
+          return True
+      return False
+    parent = _FindParent(self._interface, self._system._database, has_event_attributes)
+    if parent:
+      parent_events_class = '%sEventsImplementation' % parent.id
+    else:
+      parent_events_class = 'EventsImplementation'
+    html_inteface = self._system._html_renames.get(self._interface.id, self._interface.id)
+    events_members = self._dart_impl_emitter.Emit(
+        '\n'
+        'class $EVENTS_CLASS extends $PARENT_EVENTS_CLASS implements $EVENTS_INTERFACE {\n'
+        '  $EVENTS_CLASS(_ptr) : super(_ptr);\n'
+        '$!MEMBERS\n'
+        '}\n',
+        EVENTS_CLASS=events_class,
+        PARENT_EVENTS_CLASS=parent_events_class,
+        EVENTS_INTERFACE='html.%sEvents' % html_inteface)
+
+    events_attributes = DomToHtmlEvents(self._interface.id, events_attributes)
+    for event_name in events_attributes:
+      events_members.Emit(
+          '  EventListenerList get $HTML_NAME() => _get("$DOM_NAME");\n',
+          HTML_NAME=DomToHtmlEvent(event_name),
+          DOM_NAME=event_name)
+
+  def _EmitEventGetter(self, events_class):
+    self._members_emitter.Emit(
+        '\n'
+        '  $EVENTS_CLASS get on() {\n'
+        '    if (_on === null) _on = new $EVENTS_CLASS(this);\n'
+        '    return _on;\n'
+        '  }\n',
+        EVENTS_CLASS=events_class)
+
   def _ImplClassName(self, interface_name):
     return interface_name + 'Implementation'
 
   def _BaseClassName(self):
     if not self._interface.parents:
       return 'DOMWrapperBase'
 
     supertype = self._interface.parents[0].type.id
 
     # FIXME: We're currently injecting List<..> and EventTarget as
@@ skipping 800 matching lines @@
         FUNCTION_CALL='%s(%s)' % (function_expression, ', '.join(arguments)))
 
 def _GenerateCPPIncludes(includes):
   return ''.join(['#include %s\n' % include for include in includes])
 
 def _DOMWrapperType(database, interface):
   if interface.id == 'MessagePort':
     return 'MessagePort'
 
   type = 'Object'
-  if _InstanceOfNode(database, interface):
+  def is_node(interface):
+    return interface.id == 'Node'
+  if is_node(interface) or _FindParent(interface, database, is_node):
     type = 'Node'
   if 'ActiveDOMObject' in interface.ext_attrs:
     type = 'Active%s' % type
   return type
 
-def _InstanceOfNode(database, interface):
-  if interface.id == 'Node':
-    return True
+def _FindParent(interface, database, callback):
   for parent in interface.parents:
+    parent_name = parent.type.id
     if not database.HasInterface(parent.type.id):
       continue
     parent_interface = database.GetInterface(parent.type.id)
-    if _InstanceOfNode(database, parent_interface):
-      return True
-  return False
+    if callback(parent_interface):
+      return parent_interface
+    parent_interface = _FindParent(parent_interface, database, callback)
+    if parent_interface:
+      return parent_interface