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//lib64/python3.6/lib2to3/fixes/fix_map.py

# 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

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__pycache__ DIR	-	drwxr-xr-x	2026-02-06 23:01:23	Edit Download recursive recursive
fix_apply.py	2.37 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_asserts.py	984 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_basestring.py	320 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_buffer.py	590 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_dict.py	3.67 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_except.py	3.27 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_exec.py	979 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_execfile.py	2.00 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_exitfunc.py	2.44 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_filter.py	2.59 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_funcattrs.py	644 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_future.py	547 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_getcwdu.py	451 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_has_key.py	3.12 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_idioms.py	4.76 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_import.py	3.18 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_imports.py	5.55 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_imports2.py	289 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_input.py	708 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_intern.py	1.21 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_isinstance.py	1.57 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
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fix_itertools_imports.py	2.04 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_long.py	476 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_map.py	3.55 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_metaclass.py	8.00 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_methodattrs.py	606 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_ne.py	571 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_next.py	3.10 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_nonzero.py	591 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_numliterals.py	768 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_operator.py	3.39 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_paren.py	1.20 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_print.py	2.78 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_raise.py	2.86 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_raw_input.py	454 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_reduce.py	837 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
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fix_repr.py	613 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_set_literal.py	1.66 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_standarderror.py	449 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
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fix_throw.py	1.54 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_tuple_params.py	5.43 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_types.py	1.73 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
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fix_xrange.py	2.63 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_xreadlines.py	689 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_zip.py	1.26 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
__init__.py	47 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive