Create implementation file emitter in HtmlDartInterfaceGenerator.

lib/dom/scripts/systemhtml.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 system to generate
 Dart:html APIs from the IDL database."""
 
+import emitter
+
 from systemfrog import *
 from systeminterface import *
 
 _html_strip_webkit_prefix_classes = [
     'Animation',
     'AnimationEvent',
     'AnimationList',
     'BlobBuilder',
     'CSSKeyframeRule',
     'CSSKeyframesRule',
@@ skipping 749 matching lines @@
 class HtmlInterfacesSystem(HtmlSystem):
 
   def __init__(self, templates, database, emitters, output_dir, backend):
     super(HtmlInterfacesSystem, self).__init__(
         templates, database, emitters, output_dir)
     self._backend = backend
     self._dart_interface_file_paths = []
     self._factory_provider_emitters = {}
 
   def ProcessInterface(self, interface):
-    """."""
-
-    self._backend.ProcessInterface(interface)
-
-    if interface.id in _merged_html_interfaces:
-      return
-
-    html_interface_name = self._shared._HTMLInterfaceName(interface.id)
-    dart_interface_file_path = self._FilePathForDartInterface(
-        html_interface_name)
-
-    self._dart_interface_file_paths.append(dart_interface_file_path)
-
-    dart_interface_code = self._emitters.FileEmitter(dart_interface_file_path)
-
-    template_file = 'interface_%s.darttemplate' % html_interface_name
-    template = self._templates.TryLoad(template_file)
-    if not template:
-      template = self._templates.Load('interface.darttemplate')
-
-    HtmlDartInterfaceGenerator(
-        self, interface, dart_interface_code,
-        template, self._shared).Generate()
+    HtmlDartInterfaceGenerator(self, interface).Generate()
 
   def ProcessCallback(self, interface, info):
     """Generates a typedef for the callback interface."""
     interface_name = interface.id
     file_path = self._FilePathForDartInterface(interface_name)
     self._ProcessCallback(interface, info, file_path)
     self._backend.ProcessCallback(interface, info)
 
   def GenerateLibraries(self):
     self._backend.GenerateLibraries(self._dart_interface_file_paths)
 
   def _FilePathForDartInterface(self, interface_name):
     """Returns the file path of the Dart interface definition."""
     # TODO(jmesserly): is this the right path
     return os.path.join(self._output_dir, 'html', 'interface',
                         '%s.dart' % interface_name)
 
 # ------------------------------------------------------------------------------
 
-# TODO(jmesserly): inheritance is probably not the right way to factor this long
-# term, but it makes merging better for now.
-class HtmlDartInterfaceGenerator(DartInterfaceGenerator):
-  """Generates Dart Interface definition for one DOM IDL interface."""
+class HtmlDartInterfaceGenerator(BaseGenerator):
+  """Generates dart interface and implementation for the DOM IDL interface."""
 
-  def __init__(self, system, interface, emitter, template, shared):
-    super(HtmlDartInterfaceGenerator, self).__init__(system, interface,
-      emitter, template)
-    self._shared = shared
+  def __init__(self, system, interface):
+    super(HtmlDartInterfaceGenerator, self).__init__(
+        system._database, interface)
+    self._system = system
+    self._shared = system._shared
     self._html_interface_name = self._shared._HTMLInterfaceName(
         self._interface.id)
+    self._backend = system._backend.ImplementationGenerator(self._interface)
 
   def StartInterface(self):
+    if not self._interface.id in _merged_html_interfaces:
+      path = self._system._FilePathForDartInterface(self._html_interface_name)
+      self._system._dart_interface_file_paths.append(path)
+      self._interface_emitter = self._system._emitters.FileEmitter(path)
+    else:
+      self._interface_emitter = emitter.Emitter()
+
+    template_file = 'interface_%s.darttemplate' % self._html_interface_name
+    interface_template = (self._system._templates.TryLoad(template_file) or
+                          self._system._templates.Load('interface.darttemplate'))
+
     typename = self._html_interface_name
 
     extends = []
     suppressed_extends = []
 
     for parent in self._interface.parents:
       # TODO(vsm): Remove source_filter.
       if MatchSourceFilter(parent):
         # Parent is a DOM type.
         extends.append(self._shared.DartType(parent.type.id))
@@ skipping 30 matching lines @@
         assert factory_provider == info.factory_provider_name
       else:
         factory_provider = info.factory_provider_name
 
     if factory_provider:
       extends_str += ' default ' + factory_provider
 
     # TODO(vsm): Add appropriate package / namespace syntax.
     (self._type_comment_emitter,
      self._members_emitter,
-     self._top_level_emitter) = self._emitter.Emit(
-         self._template + '$!TOP_LEVEL',
+     self._top_level_emitter) = self._interface_emitter.Emit(
+         interface_template + '$!TOP_LEVEL',
          ID=typename,
          EXTENDS=extends_str)
 
     self._type_comment_emitter.Emit("/// @domName $DOMNAME",
         DOMNAME=self._interface.doc_js_name)
 
     for constructor_info in constructors:
       self._members_emitter.Emit(
           '\n'
           '  $CTOR($PARAMS);\n',
           CTOR=self._shared.DartType(constructor_info.ConstructorFullName()),
           PARAMS=constructor_info.ParametersInterfaceDeclaration(
                      self._shared.DartType));
 
     element_type = MaybeTypedArrayElementTypeInHierarchy(
         self._interface, self._system._database)
     if element_type:
       self._members_emitter.Emit(
           '\n'
           '  $CTOR(int length);\n'
           '\n'
           '  $CTOR.fromList(List<$TYPE> list);\n'
           '\n'
           '  $CTOR.fromBuffer(ArrayBuffer buffer,'
                             ' [int byteOffset, int length]);\n',
         CTOR=self._interface.id,
         TYPE=self._shared.DartType(element_type))
 
     emit_events, events = self._shared.GetEventAttributes(self._interface)
-    if not emit_events:
-      return
-    elif events:
-      self.AddEventAttributes(events)
-    else:
-      self._EmitEventGetter(self._shared.GetParentEventsClass(self._interface))
+    if emit_events:
+      if events:
+        self.AddEventAttributes(events)
+      else:
+        self._EmitEventGetter(self._shared.GetParentEventsClass(self._interface))
 
     for merged_interface in _merged_html_interfaces:
       if _merged_html_interfaces[merged_interface] == self._interface.id:
         self.AddMembers(self._database.GetInterface(merged_interface))
 
+    # Generate implementation.
+    if self._backend.HasImplementation():
+      path = self._backend.FilePathForDartImplementation()
+      self._system._dart_interface_file_paths.append(path)
+      implementation_emitter = self._system._emitters.FileEmitter(path)
+    else:
+      implementation_emitter = emitter.Emitter()
+    self._backend.SetImplementationEmitter(implementation_emitter)
+    self._backend.Generate()
+
   def AddAttribute(self, getter, setter):
     dom_name = DartDomNameOfAttribute(getter)
     html_getter_name = self._shared.RenameInHtmlLibrary(
       self._interface.id, dom_name, 'get:')
     html_setter_name = self._shared.RenameInHtmlLibrary(
       self._interface.id, dom_name, 'set:')
 
     if not html_getter_name or self._shared.IsPrivate(html_getter_name):
       getter = None
     if not html_setter_name or self._shared.IsPrivate(html_setter_name):
@@ skipping 39 matching lines @@
                                  '  $TYPE $NAME($PARAMS);\n',
                                  TYPE=self._shared.DartType(info.type_name),
                                  NAME=html_name,
                                  PARAMS=info.ParametersInterfaceDeclaration(
                                         self._shared.DartType))
 
   def FinishInterface(self):
     pass
 
   def AddConstant(self, constant):
-    self._EmitConstant(self._members_emitter, constant)
+    type = TypeOrNothing(DartType(constant.type.id), constant.type.id)
+    self._members_emitter.Emit('\n  static final $TYPE$NAME = $VALUE;\n',
+                               NAME=constant.id,
+                               TYPE=type,
+                               VALUE=constant.value)
 
   def AddEventAttributes(self, event_attrs):
     event_attrs = DomToHtmlEvents(self._html_interface_name, event_attrs)
     self._shared._event_classes.add(self._interface.id)
     events_interface = self._html_interface_name + 'Events'
     self._EmitEventGetter(events_interface)
 
-    events_members = self._emitter.Emit(
+    events_members = self._interface_emitter.Emit(
         '\ninterface $INTERFACE extends $PARENTS {\n$!MEMBERS}\n',
         INTERFACE=events_interface,
         PARENTS=', '.join(
             self._shared.GetParentsEventsClasses(self._interface)))
 
     for event_name in event_attrs:
       if event_name in _html_event_names:
         events_members.Emit('\n  EventListenerList get $NAME();\n',
           NAME=_html_event_names[event_name])
       else:
@@ skipping 10 matching lines @@
 
 # ------------------------------------------------------------------------------
 
 # TODO(jmesserly): inheritance is probably not the right way to factor this long
 # term, but it makes merging better for now.
 class HtmlFrogClassGenerator(FrogInterfaceGenerator):
   """Generates a Frog class for the dart:html library from a DOM IDL
   interface.
   """
 
-  def __init__(self, system, interface, template, dart_code,
-      shared):
+  def __init__(self, system, interface):
     super(HtmlFrogClassGenerator, self).__init__(
-        system, interface, template, dart_code)
-    self._shared = shared
+        system, interface, None, None)
+    self._shared = self._system._shared
     self._html_interface_name = self._shared._HTMLInterfaceName(
         self._interface.id)
 
+  def HasImplementation(self):
+    return not (IsPureInterface(self._interface.id) or
+                self._interface.id in _merged_html_interfaces)
+
+  def FilePathForDartImplementation(self):
+    return os.path.join(self._system._output_dir, 'html', 'frog',
+                        '%s.dart' % self._html_interface_name)
+
+  def SetImplementationEmitter(self, implementation_emitter):
+    self._dart_code = implementation_emitter
+
   def _ImplClassName(self, type_name):
     return self._shared._ImplClassName(type_name)
 
   def _NarrowToImplementationType(self, type_name):
     if self._ShouldNarrowToImplementationType(type_name):
       return self._ImplClassName(self._shared.DartType(type_name))
     return self._shared.DartType(type_name)
 
   def StartInterface(self):
     interface = self._interface
@@ skipping 16 matching lines @@
 
     extends = ' extends ' + base if base else ''
 
     # TODO: Include all implemented interfaces, including other Lists.
     implements = [self._html_interface_name]
     element_type = MaybeTypedArrayElementType(self._interface)
     if element_type:
       implements.append('List<%s>' % self._shared.DartType(element_type))
       implements.append('JavaScriptIndexingBehavior')
 
+    template_file = 'impl_%s.darttemplate' % self._html_interface_name
+    template = (self._system._templates.TryLoad(template_file) or
+                self._system._templates.Load('frog_impl.darttemplate'))
     self._members_emitter = self._dart_code.Emit(
-        self._template,
+        template,
         #class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
         #$!MEMBERS
         #}
         CLASSNAME=self._class_name,
         EXTENDS=extends,
         IMPLEMENTS=' implements ' + ', '.join(implements),
         NATIVESPEC=' native "' + native_spec + '"')
     if self._members_emitter == None:
       raise Exception("Class %s doesn't use the $!MEMBERS variable" %
                       self._class_name)
@@ skipping 264 matching lines @@
 # ------------------------------------------------------------------------------
 
 class HtmlFrogSystem(HtmlSystem):
 
   def __init__(self, templates, database, emitters, output_dir):
     super(HtmlFrogSystem, self).__init__(
         templates, database, emitters, output_dir)
     self._dart_frog_file_paths = []
     self._factory_provider_emitters = {}
 
-  def ProcessInterface(self, interface):
-    """."""
-    if interface.id in _merged_html_interfaces:
-      return None
-
-    if IsPureInterface(interface.id):
-      return
-
-    html_interface_name = self._shared._HTMLInterfaceName(interface.id)
-    template_file = 'impl_%s.darttemplate' % html_interface_name
-    template = self._templates.TryLoad(template_file)
-    if not template:
-      template = self._templates.Load('frog_impl.darttemplate')
-
-    dart_code = self._ImplFileEmitter(html_interface_name)
-    generator = HtmlFrogClassGenerator(self, interface, template,
-                                       dart_code, self._shared)
-    generator.Generate()
+  def ImplementationGenerator(self, interface):
+    return HtmlFrogClassGenerator(self, interface)
 
   def GenerateLibraries(self, interface_files):
     self._GenerateLibFile(
         'html_frog.darttemplate',
         os.path.join(self._output_dir, 'html_frog.dart'),
         interface_files + self._dart_frog_file_paths)
 
   def Finish(self):
     pass
 
@@ skipping 28 matching lines @@
             Collect(database.GetInterface(parent.type.id),
                     seen, collected)
 
   inheritance_closure = {}
   for interface in database.GetInterfaces():
     seen = set()
     collected = []
     Collect(interface, seen, collected)
     inheritance_closure[interface.id] = collected
   return inheritance_closure