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svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r74359 | benjamin.peterson | 2009-08-12 17:23:13 -0500 (Wed, 12 Aug 2009) | 1 line don't pass the deprecated print_function option ........ r75081 | benjamin.peterson | 2009-09-26 22:02:57 -0500 (Sat, 26 Sep 2009) | 1 line let 2to3 work with extended iterable unpacking ........ r75088 | benjamin.peterson | 2009-09-27 11:25:21 -0500 (Sun, 27 Sep 2009) | 1 line look on the type only for __call__ ........ r75213 | benjamin.peterson | 2009-10-03 10:09:46 -0500 (Sat, 03 Oct 2009) | 5 lines revert 75212; it's not correct People can use isinstance(x, collections.Callable) if they expect objects with __call__ in their instance dictionaries. ........ r75278 | benjamin.peterson | 2009-10-07 16:25:56 -0500 (Wed, 07 Oct 2009) | 4 lines fix whitespace problems with fix_idioms #3563 Patch by Joe Amenta. ........ r75303 | benjamin.peterson | 2009-10-09 16:59:11 -0500 (Fri, 09 Oct 2009) | 1 line port latin-1 and utf-8 cookie improvements ........ r75427 | benjamin.peterson | 2009-10-14 20:35:57 -0500 (Wed, 14 Oct 2009) | 1 line force floor division ........ r75428 | benjamin.peterson | 2009-10-14 20:39:21 -0500 (Wed, 14 Oct 2009) | 1 line silence -3 warnings about __hash__ ........ r75734 | benjamin.peterson | 2009-10-26 16:25:53 -0500 (Mon, 26 Oct 2009) | 2 lines warn on map(None, ...) with more than 2 arguments #7203 ........ r75735 | benjamin.peterson | 2009-10-26 16:28:25 -0500 (Mon, 26 Oct 2009) | 1 line remove unused result ........ r75736 | benjamin.peterson | 2009-10-26 16:29:02 -0500 (Mon, 26 Oct 2009) | 1 line using get() here is a bit pointless ........ r75865 | benjamin.peterson | 2009-10-27 15:49:00 -0500 (Tue, 27 Oct 2009) | 1 line explain reason for warning ........ r76059 | benjamin.peterson | 2009-11-02 11:43:47 -0600 (Mon, 02 Nov 2009) | 1 line tuples are no longer used for children ........ r76060 | benjamin.peterson | 2009-11-02 11:55:40 -0600 (Mon, 02 Nov 2009) | 1 line revert r76059; apparently some fixers rely on Leaf no () for children ........ r76061 | benjamin.peterson | 2009-11-02 12:06:17 -0600 (Mon, 02 Nov 2009) | 1 line make fix_tuple_params keep the tree valid #7253 ........
90 lines
3 KiB
Python
90 lines
3 KiB
Python
# Copyright 2007 Google, Inc. All Rights Reserved.
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# Licensed to PSF under a Contributor Agreement.
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"""Fixer that changes map(F, ...) into list(map(F, ...)) unless there
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exists a 'from future_builtins import map' statement in the top-level
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namespace.
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As a special case, map(None, X) is changed into list(X). (This is
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necessary because the semantics are changed in this case -- the new
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map(None, X) is equivalent to [(x,) for x in X].)
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We avoid the transformation (except for the special case mentioned
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above) if the map() call is directly contained in iter(<>), list(<>),
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tuple(<>), sorted(<>), ...join(<>), or for V in <>:.
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NOTE: This is still not correct if the original code was depending on
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map(F, X, Y, ...) to go on until the longest argument is exhausted,
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substituting None for missing values -- like zip(), it now stops as
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soon as the shortest argument is exhausted.
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"""
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# Local imports
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from ..pgen2 import token
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from .. import fixer_base
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from ..fixer_util import Name, Call, ListComp, in_special_context
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from ..pygram import python_symbols as syms
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class FixMap(fixer_base.ConditionalFix):
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PATTERN = """
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map_none=power<
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'map'
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trailer< '(' arglist< 'None' ',' arg=any [','] > ')' >
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>
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map_lambda=power<
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'map'
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trailer<
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'('
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arglist<
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lambdef< 'lambda'
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(fp=NAME | vfpdef< '(' fp=NAME ')'> ) ':' xp=any
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>
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','
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it=any
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>
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')'
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>
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>
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power<
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'map' trailer< '(' [arglist=any] ')' >
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>
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"""
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skip_on = 'future_builtins.map'
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def transform(self, node, results):
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if self.should_skip(node):
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return
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if node.parent.type == syms.simple_stmt:
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self.warning(node, "You should use a for loop here")
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new = node.clone()
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new.prefix = u""
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new = Call(Name(u"list"), [new])
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elif "map_lambda" in results:
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new = ListComp(results["xp"].clone(),
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results["fp"].clone(),
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results["it"].clone())
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else:
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if "map_none" in results:
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new = results["arg"].clone()
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else:
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if "arglist" in results:
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args = results["arglist"]
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if args.type == syms.arglist and \
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args.children[0].type == token.NAME and \
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args.children[0].value == "None":
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self.warning(node, "cannot convert map(None, ...) "
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"with multiple arguments because map() "
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"now truncates to the shortest sequence")
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return
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if in_special_context(node):
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return None
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new = node.clone()
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new.prefix = u""
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new = Call(Name(u"list"), [new])
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new.prefix = node.prefix
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return new
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