| Dan Albert | 287553d | 2017-02-16 10:47:51 -0800 | [diff] [blame] | 1 | # Copyright 2007 Google, Inc. All Rights Reserved. |
| 2 | # Licensed to PSF under a Contributor Agreement. |
| 3 | |
| 4 | """Fixer for callable(). |
| 5 | |
| 6 | This converts callable(obj) into isinstance(obj, collections.Callable), adding a |
| 7 | collections import if needed.""" |
| 8 | |
| 9 | # Local imports |
| 10 | from lib2to3 import fixer_base |
| 11 | from lib2to3.fixer_util import Call, Name, String, Attr, touch_import |
| 12 | |
| 13 | class FixCallable(fixer_base.BaseFix): |
| 14 | BM_compatible = True |
| 15 | |
| 16 | order = "pre" |
| 17 | |
| 18 | # Ignore callable(*args) or use of keywords. |
| 19 | # Either could be a hint that the builtin callable() is not being used. |
| 20 | PATTERN = """ |
| 21 | power< 'callable' |
| 22 | trailer< lpar='(' |
| 23 | ( not(arglist | argument<any '=' any>) func=any |
| 24 | | func=arglist<(not argument<any '=' any>) any ','> ) |
| 25 | rpar=')' > |
| 26 | after=any* |
| 27 | > |
| 28 | """ |
| 29 | |
| 30 | def transform(self, node, results): |
| 31 | func = results['func'] |
| 32 | |
| 33 | touch_import(None, u'collections', node=node) |
| 34 | |
| 35 | args = [func.clone(), String(u', ')] |
| 36 | args.extend(Attr(Name(u'collections'), Name(u'Callable'))) |
| 37 | return Call(Name(u'isinstance'), args, prefix=node.prefix) |