+ @classmethod
+ def reject_msgs(cls, has):
+ if len(cls.requires) != len([x for x in cls.requires if has[x]]):
+ yield "lack of required files for format %s" % cls.name
+
+ for key in cls.disallowed:
+ if has[key]:
+ yield "contains source files not allowed in format %s" % cls.name
+
+class FormatOne(SourceFormat):