Support per-overload [RuntimeEnabled] extended attribute

Source/bindings/scripts/code_generator_v8.py

Index: Source/bindings/scripts/code_generator_v8.py
diff --git a/Source/bindings/scripts/code_generator_v8.py b/Source/bindings/scripts/code_generator_v8.py
index 37253ba582581d74d05b6cd002385d163791183d..97753cf56653b444cc43942faaee3713fd8e5670 100644
--- a/Source/bindings/scripts/code_generator_v8.py
+++ b/Source/bindings/scripts/code_generator_v8.py
@@ -184,8 +184,16 @@ def runtime_enabled_if(code, runtime_enabled_function_name):
         return code
     # Indent if statement to level of original code
     indent = re.match(' *', code).group(0)
-    return ('%sif (%s())\n' % (indent, runtime_enabled_function_name) +
-            '    %s' % code)
+    lines = code.splitlines()
+    if len(lines) > 1:

[Nils Barth (inactive), 2014/05/27 06:33:20]

It's fine to always use a { } block, so you can eliminate this test:
CG simplicity is more important than generated code polish.

+        fmt = '%(indent)sif (%(fnname)s()) {\n    %(code)s\n%(indent)s}\n'

[Nils Barth (inactive), 2014/05/27 06:33:20]

Could you use string concatenation and split the string across lines, as in
existing code?
(It's really hard to eyeball the multi-line code.)

+    else:
+        fmt = '%(indent)sif (%(fnname)s())\n    %(code)s\n'
+    return fmt % {

[Nils Barth (inactive), 2014/05/27 06:33:20]

Could you use str.format instead of % with a dict?
(Formally this is b/c using % with a dict is dynamic,
while str.format has a static list of keywords.)

Actually, if you eliminate the if clause, I think you don't need formatting, and
can use basically the existing code, just with the split/join.

+        'indent': indent,
+        'fnname': runtime_enabled_function_name,
+        'code': '\n    '.join(lines),
+    }
 
 
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