summaryrefslogtreecommitdiffstats
path: root/Lib/lib2to3/fixes/fix_map.py
diff options
context:
space:
mode:
Diffstat (limited to 'Lib/lib2to3/fixes/fix_map.py')
-rw-r--r--Lib/lib2to3/fixes/fix_map.py110
1 files changed, 0 insertions, 110 deletions
diff --git a/Lib/lib2to3/fixes/fix_map.py b/Lib/lib2to3/fixes/fix_map.py
deleted file mode 100644
index 78cf81c..0000000
--- a/Lib/lib2to3/fixes/fix_map.py
+++ /dev/null
@@ -1,110 +0,0 @@
-# Copyright 2007 Google, Inc. All Rights Reserved.
-# Licensed to PSF under a Contributor Agreement.
-
-"""Fixer that changes map(F, ...) into list(map(F, ...)) unless there
-exists a 'from future_builtins import map' statement in the top-level
-namespace.
-
-As a special case, map(None, X) is changed into list(X). (This is
-necessary because the semantics are changed in this case -- the new
-map(None, X) is equivalent to [(x,) for x in X].)
-
-We avoid the transformation (except for the special case mentioned
-above) if the map() call is directly contained in iter(<>), list(<>),
-tuple(<>), sorted(<>), ...join(<>), or for V in <>:.
-
-NOTE: This is still not correct if the original code was depending on
-map(F, X, Y, ...) to go on until the longest argument is exhausted,
-substituting None for missing values -- like zip(), it now stops as
-soon as the shortest argument is exhausted.
-"""
-
-# Local imports
-from ..pgen2 import token
-from .. import fixer_base
-from ..fixer_util import Name, ArgList, Call, ListComp, in_special_context
-from ..pygram import python_symbols as syms
-from ..pytree import Node
-
-
-class FixMap(fixer_base.ConditionalFix):
- BM_compatible = True
-
- PATTERN = """
- map_none=power<
- 'map'
- trailer< '(' arglist< 'None' ',' arg=any [','] > ')' >
- [extra_trailers=trailer*]
- >
- |
- map_lambda=power<
- 'map'
- trailer<
- '('
- arglist<
- lambdef< 'lambda'
- (fp=NAME | vfpdef< '(' fp=NAME ')'> ) ':' xp=any
- >
- ','
- it=any
- >
- ')'
- >
- [extra_trailers=trailer*]
- >
- |
- power<
- 'map' args=trailer< '(' [any] ')' >
- [extra_trailers=trailer*]
- >
- """
-
- skip_on = 'future_builtins.map'
-
- def transform(self, node, results):
- if self.should_skip(node):
- return
-
- trailers = []
- if 'extra_trailers' in results:
- for t in results['extra_trailers']:
- trailers.append(t.clone())
-
- if node.parent.type == syms.simple_stmt:
- self.warning(node, "You should use a for loop here")
- new = node.clone()
- new.prefix = ""
- new = Call(Name("list"), [new])
- elif "map_lambda" in results:
- new = ListComp(results["xp"].clone(),
- results["fp"].clone(),
- results["it"].clone())
- new = Node(syms.power, [new] + trailers, prefix="")
-
- else:
- if "map_none" in results:
- new = results["arg"].clone()
- new.prefix = ""
- else:
- if "args" in results:
- args = results["args"]
- if args.type == syms.trailer and \
- args.children[1].type == syms.arglist and \
- args.children[1].children[0].type == token.NAME and \
- args.children[1].children[0].value == "None":
- self.warning(node, "cannot convert map(None, ...) "
- "with multiple arguments because map() "
- "now truncates to the shortest sequence")
- return
-
- new = Node(syms.power, [Name("map"), args.clone()])
- new.prefix = ""
-
- if in_special_context(node):
- return None
-
- new = Node(syms.power, [Name("list"), ArgList([new])] + trailers)
- new.prefix = ""
-
- new.prefix = node.prefix
- return new