Make per-interface generators an implementation detail of a system.

lib/dom/scripts/systemhtml.py

Index: lib/dom/scripts/systemhtml.py
diff --git a/lib/dom/scripts/systemhtml.py b/lib/dom/scripts/systemhtml.py
index 4b2dabf1a6a5756083ff50d768577c71ce6e9d19..323790aed436e9194478e6e4fd2bed20b05826f1 100644
--- a/lib/dom/scripts/systemhtml.py
+++ b/lib/dom/scripts/systemhtml.py
@@ -773,14 +773,10 @@ class HtmlInterfacesSystem(HtmlSystem):
     self._dart_interface_file_paths = []
     self._factory_provider_emitters = {}
 
-  def InterfaceGenerator(self,
-                         interface,
-                         common_prefix,
-                         super_interface_name,
-                         source_filter):
+  def ProcessInterface(self, interface):
     """."""
     if interface.id in _merged_html_interfaces:
-      return None
+      return
 
     html_interface_name = self._shared._HTMLInterfaceName(interface.id)
     dart_interface_file_path = self._FilePathForDartInterface(
@@ -795,11 +791,9 @@ class HtmlInterfacesSystem(HtmlSystem):
     if not template:
       template = self._templates.Load('interface.darttemplate')
 
-    return HtmlDartInterfaceGenerator(
+    HtmlDartInterfaceGenerator(
         self, interface, dart_interface_code,
-        template,
-        common_prefix, super_interface_name,
-        source_filter, self._shared)
+        template, self._shared).Generate()
 
   def ProcessCallback(self, interface, info):
     """Generates a typedef for the callback interface."""
@@ -824,10 +818,9 @@ class HtmlInterfacesSystem(HtmlSystem):
 class HtmlDartInterfaceGenerator(DartInterfaceGenerator):
   """Generates Dart Interface definition for one DOM IDL interface."""
 
-  def __init__(self, system, interface, emitter, template,
-               common_prefix, super_interface, source_filter, shared):
+  def __init__(self, system, interface, emitter, template, shared):
     super(HtmlDartInterfaceGenerator, self).__init__(system, interface,
-      emitter, template, common_prefix, super_interface, source_filter)
+      emitter, template)
     self._shared = shared
     self._html_interface_name = self._shared._HTMLInterfaceName(
         self._interface.id)
@@ -840,7 +833,7 @@ class HtmlDartInterfaceGenerator(DartInterfaceGenerator):
 
     for parent in self._interface.parents:
       # TODO(vsm): Remove source_filter.
-      if MatchSourceFilter(self._source_filter, parent):
+      if MatchSourceFilter(parent):
         # Parent is a DOM type.
         extends.append(self._shared.DartType(parent.type.id))
       elif '<' in parent.type.id:
@@ -1023,10 +1016,10 @@ class HtmlFrogClassGenerator(FrogInterfaceGenerator):
   interface.
   """
 
-  def __init__(self, system, interface, template, super_interface, dart_code,
+  def __init__(self, system, interface, template, dart_code,
       shared):
     super(HtmlFrogClassGenerator, self).__init__(
-        system, interface, template, super_interface, dart_code)
+        system, interface, template, dart_code)
     self._shared = shared
     self._html_interface_name = self._shared._HTMLInterfaceName(
         self._interface.id)
@@ -1353,11 +1346,7 @@ class HtmlFrogSystem(HtmlSystem):
     self._dart_frog_file_paths = []
     self._factory_provider_emitters = {}
 
-  def InterfaceGenerator(self,
-                         interface,
-                         common_prefix,
-                         super_interface_name,
-                         source_filter):
+  def ProcessInterface(self, interface):
     """."""
     if interface.id in _merged_html_interfaces:
       return None
@@ -1372,8 +1361,9 @@ class HtmlFrogSystem(HtmlSystem):
       template = self._templates.Load('frog_impl.darttemplate')
 
     dart_code = self._ImplFileEmitter(html_interface_name)
-    return HtmlFrogClassGenerator(self, interface, template,
-                                  super_interface_name, dart_code, self._shared)
+    generator = HtmlFrogClassGenerator(self, interface, template,
+                                       dart_code, self._shared)
+    generator.Generate()
 
   def GenerateLibraries(self):
     self._GenerateLibFile(
@@ -1414,14 +1404,10 @@ class HtmlDartiumSystem(HtmlSystem):
     self._auxiliary_dir = auxiliary_dir
     self._dom_implementation_classes = dom_implementation_classes
 
-  def InterfaceGenerator(self,
-                         interface,
-                         common_prefix,
-                         super_interface_name,
-                         source_filter):
+  def ProcessInterface(self, interface):
     # Implementation classes are generated by NativeImplementationSystem.
     # FIXME: merge HtmlDartiumSystem into NativeImplementationSystem.
-    return None
+    pass
 
   def ProcessCallback(self, interface, info):
     pass