Refactor conversion to native.

lib/dom/scripts/generator.py

Index: lib/dom/scripts/generator.py
diff --git a/lib/dom/scripts/generator.py b/lib/dom/scripts/generator.py
index d4765f87c662583cc869957ccdc5f33746400ec8..04b88a7181dbac9195847b8381051d33049dcdd4 100644
--- a/lib/dom/scripts/generator.py
+++ b/lib/dom/scripts/generator.py
@@ -466,39 +466,25 @@ class IDLTypeInfo(object):
   def requires_v8_scope(self):
     return self._data.requires_v8_scope
 
-  def emit_to_native(self, emitter, idl_node, accept_null, name, handle):
+  def to_native_info(self, idl_node, accept_null, name, interface_name):
+    cls = 'Dart%s' % self.idl_type()
+
     if 'Callback' in idl_node.ext_attrs:
       function_name = 'create'
       if accept_null:
         function_name += 'WithNullCheck'
-      emitter.Emit(
-        '\n'
-        '        RefPtr<$TYPE> $NAME = Dart$IDL_TYPE::$FUNCTION_NAME($HANDLE, exception);\n'
-        '        if (exception)\n'
-        '            goto fail;\n',
-        TYPE=self.native_type(),
-        NAME=name,
-        FUNCTION_NAME=function_name,
-        IDL_TYPE=self.idl_type(),
-        HANDLE=handle)
-      return
+      return name, 'RefPtr<%s>' % self.native_type(), cls, function_name
 
     if self.custom_to_native():
       type = 'RefPtr<%s>' % self.native_type()
+      argument = '%s.get()' % name
     else:
       type = '%s*' % self.native_type()
-    emitter.Emit(
-        '\n'
-        '        $TYPE $NAME = Dart$IDL_TYPE::toNative($HANDLE, exception);\n'
-        '        if (exception)\n'
-        '            goto fail;\n',
-        TYPE=type,
-        NAME=name,
-        IDL_TYPE=self.idl_type(),
-        HANDLE=handle)
-
-  def argument_expression(self, name, interface_name):
-    return '%s.get()' % name if self.custom_to_native() else name
+      if isinstance(self, SVGTearOffIDLTypeInfo) and not interface_name.endswith('List'):
+        argument = '%s->propertyReference()' % name
+      else:
+        argument = name
+    return argument, type, cls, 'toNative'
 
   def custom_to_native(self):
     return self._data.custom_to_native
@@ -542,9 +528,6 @@ class IDLTypeInfo(object):
     includes = [self._idl_type] + (self._data.conversion_includes or [])
     return ['"Dart%s.h"' % include for include in includes]
 
-  def to_native_includes(self):
-    return ['"Dart%s.h"' % self.idl_type()]
-
   def to_dart_conversion(self, value, interface_name=None, attributes=None):
     return 'Dart%s::toDart(%s)' % (self._idl_type, value)
 
@@ -576,25 +559,16 @@ class DOMStringArrayTypeInfo(SequenceIDLTypeInfo):
   def __init__(self, data, item_info):
     super(DOMStringArrayTypeInfo, self).__init__('DOMString[]', data, item_info)
 
-  def emit_to_native(self, emitter, idl_node, accept_null, name, handle):
+  def to_native_info(self, idl_node, accept_null, name, interface_name):
     assert not accept_null
-    emitter.Emit(
-        '\n'
-        '        RefPtr<DOMStringList> $NAME = DartDOMStringList::toNative($HANDLE, exception);\n'
-        '        if (exception)\n'
-        '            goto fail;\n',
-        NAME=name,
-        HANDLE=handle)
-
-  def to_native_includes(self):
-    return ['"DartDOMStringList.h"']
+    return name, 'RefPtr<DOMStringList>', 'DartDOMStringList', 'toNative'
 
 
 class PrimitiveIDLTypeInfo(IDLTypeInfo):
   def __init__(self, idl_type, data):
     super(PrimitiveIDLTypeInfo, self).__init__(idl_type, data)
 
-  def emit_to_native(self, emitter, idl_node, accept_null, name, handle):
+  def to_native_info(self, idl_node, accept_null, name, interface_name):
     function_name = 'dartTo%s' % self._capitalized_native_type()
     if accept_null:
       function_name += 'WithNullCheck'
@@ -603,15 +577,7 @@ class PrimitiveIDLTypeInfo(IDLTypeInfo):
       type = 'RefPtr<%s>' % type
     if type == 'String':
       type = 'DartStringAdapter'
-    emitter.Emit(
-        '\n'
-        '        $TYPE $NAME = DartUtilities::$FUNCTION_NAME($HANDLE, exception);\n'
-        '        if (exception)\n'
-        '            goto fail;\n',
-        TYPE=type,
-        NAME=name,
-        FUNCTION_NAME=function_name,
-        HANDLE=handle)
+    return name, type, 'DartUtilities', function_name
 
   def parameter_type(self):
     if self.native_type() == 'String':
@@ -621,9 +587,6 @@ class PrimitiveIDLTypeInfo(IDLTypeInfo):
   def conversion_includes(self):
     return []
 
-  def to_native_includes(sefl):
-    return []
-
   def to_dart_conversion(self, value, interface_name=None, attributes=None):
     function_name = self._capitalized_native_type()
     function_name = function_name[0].lower() + function_name[1:]