| # Copyright 2007 Google, Inc. All Rights Reserved. |
| # Licensed to PSF under a Contributor Agreement. |
| |
| """Fixer for callable(). |
| |
| This converts callable(obj) into isinstance(obj, collections.Callable), adding a |
| collections import if needed.""" |
| |
| # Local imports |
| from lib2to3 import fixer_base |
| from lib2to3.fixer_util import Call, Name, String, Attr, touch_import |
| |
| class FixCallable(fixer_base.BaseFix): |
| BM_compatible = True |
| |
| order = "pre" |
| |
| # Ignore callable(*args) or use of keywords. |
| # Either could be a hint that the builtin callable() is not being used. |
| PATTERN = """ |
| power< 'callable' |
| trailer< lpar='(' |
| ( not(arglist | argument<any '=' any>) func=any |
| | func=arglist<(not argument<any '=' any>) any ','> ) |
| rpar=')' > |
| after=any* |
| > |
| """ |
| |
| def transform(self, node, results): |
| func = results['func'] |
| |
| touch_import(None, u'collections', node=node) |
| |
| args = [func.clone(), String(u', ')] |
| args.extend(Attr(Name(u'collections'), Name(u'Callable'))) |
| return Call(Name(u'isinstance'), args, prefix=node.prefix) |
