Support WebIDL's ExtendedAttributeIdentList in the Blink parser

Source/bindings/scripts/utilities.py

Index: Source/bindings/scripts/utilities.py
diff --git a/Source/bindings/scripts/utilities.py b/Source/bindings/scripts/utilities.py
index 28beb17c94e8a842c10f7f4ddafa980f47ef0224..367476598a1b8e0b115f749d41ce258941e91d78 100644
--- a/Source/bindings/scripts/utilities.py
+++ b/Source/bindings/scripts/utilities.py
@@ -153,10 +153,10 @@ def get_interface_extended_attributes_from_idl(file_contents):
 
     extended_attributes_string = match.group(1)
     extended_attributes = {}
-    # FIXME: this splitting is WRONG: it fails on ExtendedAttributeArgList like
-    # 'NamedConstructor=Foo(a, b)'
+    # FIXME: this splitting is WRONG: it fails on extended attributes where lists of
+    # multiple values are used, which are seperated by a comma and a space.

[Peter Beverloo, 2014/08/01 16:14:03]

Are there plans to make these scripts use the actual IDL parser instead of
regular expressions (I presume this was done for performance reasons)?

Going from a bad hack to another (arguably slightly less) bad hack is sad :-(.

     parts = [extended_attribute.strip()
-             for extended_attribute in extended_attributes_string.split(',')
+             for extended_attribute in re.split(',\s+', extended_attributes_string)
              # Discard empty parts, which may exist due to trailing comma
              if extended_attribute.strip()]
     for part in parts: