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# 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
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| __pycache__ | Folder | 0755 |
|
|
| __init__.py | File | 47 B | 0644 |
|
| fix_apply.py | File | 2.29 KB | 0644 |
|
| fix_asserts.py | File | 984 B | 0644 |
|
| fix_basestring.py | File | 320 B | 0644 |
|
| fix_buffer.py | File | 590 B | 0644 |
|
| fix_dict.py | File | 3.67 KB | 0644 |
|
| fix_except.py | File | 3.27 KB | 0644 |
|
| fix_exec.py | File | 979 B | 0644 |
|
| fix_execfile.py | File | 2 KB | 0644 |
|
| fix_exitfunc.py | File | 2.44 KB | 0644 |
|
| fix_filter.py | File | 2.7 KB | 0644 |
|
| fix_funcattrs.py | File | 644 B | 0644 |
|
| fix_future.py | File | 547 B | 0644 |
|
| fix_getcwdu.py | File | 451 B | 0644 |
|
| fix_has_key.py | File | 3.12 KB | 0644 |
|
| fix_idioms.py | File | 4.76 KB | 0644 |
|
| fix_import.py | File | 3.18 KB | 0644 |
|
| fix_imports.py | File | 5.55 KB | 0644 |
|
| fix_imports2.py | File | 289 B | 0644 |
|
| fix_input.py | File | 708 B | 0644 |
|
| fix_intern.py | File | 1.12 KB | 0644 |
|
| fix_isinstance.py | File | 1.57 KB | 0644 |
|
| fix_itertools.py | File | 1.51 KB | 0644 |
|
| fix_itertools_imports.py | File | 2.04 KB | 0644 |
|
| fix_long.py | File | 476 B | 0644 |
|
| fix_map.py | File | 3.55 KB | 0644 |
|
| fix_metaclass.py | File | 8 KB | 0644 |
|
| fix_methodattrs.py | File | 606 B | 0644 |
|
| fix_ne.py | File | 571 B | 0644 |
|
| fix_next.py | File | 3.1 KB | 0644 |
|
| fix_nonzero.py | File | 591 B | 0644 |
|
| fix_numliterals.py | File | 768 B | 0644 |
|
| fix_operator.py | File | 3.35 KB | 0644 |
|
| fix_paren.py | File | 1.2 KB | 0644 |
|
| fix_print.py | File | 2.78 KB | 0644 |
|
| fix_raise.py | File | 2.86 KB | 0644 |
|
| fix_raw_input.py | File | 454 B | 0644 |
|
| fix_reduce.py | File | 837 B | 0644 |
|
| fix_reload.py | File | 1.06 KB | 0644 |
|
| fix_renames.py | File | 2.17 KB | 0644 |
|
| fix_repr.py | File | 613 B | 0644 |
|
| fix_set_literal.py | File | 1.66 KB | 0644 |
|
| fix_standarderror.py | File | 449 B | 0644 |
|
| fix_sys_exc.py | File | 1.01 KB | 0644 |
|
| fix_throw.py | File | 1.54 KB | 0644 |
|
| fix_tuple_params.py | File | 5.43 KB | 0644 |
|
| fix_types.py | File | 1.73 KB | 0644 |
|
| fix_unicode.py | File | 1.23 KB | 0644 |
|
| fix_urllib.py | File | 8.17 KB | 0644 |
|
| fix_ws_comma.py | File | 1.06 KB | 0644 |
|
| fix_xrange.py | File | 2.63 KB | 0644 |
|
| fix_xreadlines.py | File | 689 B | 0644 |
|
| fix_zip.py | File | 1.26 KB | 0644 |
|