晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/python2.7/lib2to3/fixes/fix_has_key.py
# Copyright 2006 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.

"""Fixer for has_key().

Calls to .has_key() methods are expressed in terms of the 'in'
operator:

    d.has_key(k) -> k in d

CAVEATS:
1) While the primary target of this fixer is dict.has_key(), the
   fixer will change any has_key() method call, regardless of its
   class.

2) Cases like this will not be converted:

    m = d.has_key
    if m(k):
        ...

   Only *calls* to has_key() are converted. While it is possible to
   convert the above to something like

    m = d.__contains__
    if m(k):
        ...

   this is currently not done.
"""

# Local imports
from .. import pytree
from ..pgen2 import token
from .. import fixer_base
from ..fixer_util import Name, parenthesize


class FixHasKey(fixer_base.BaseFix):
    BM_compatible = True

    PATTERN = """
    anchor=power<
        before=any+
        trailer< '.' 'has_key' >
        trailer<
            '('
            ( not(arglist | argument<any '=' any>) arg=any
            | arglist<(not argument<any '=' any>) arg=any ','>
            )
            ')'
        >
        after=any*
    >
    |
    negation=not_test<
        'not'
        anchor=power<
            before=any+
            trailer< '.' 'has_key' >
            trailer<
                '('
                ( not(arglist | argument<any '=' any>) arg=any
                | arglist<(not argument<any '=' any>) arg=any ','>
                )
                ')'
            >
        >
    >
    """

    def transform(self, node, results):
        assert results
        syms = self.syms
        if (node.parent.type == syms.not_test and
            self.pattern.match(node.parent)):
            # Don't transform a node matching the first alternative of the
            # pattern when its parent matches the second alternative
            return None
        negation = results.get("negation")
        anchor = results["anchor"]
        prefix = node.prefix
        before = [n.clone() for n in results["before"]]
        arg = results["arg"].clone()
        after = results.get("after")
        if after:
            after = [n.clone() for n in after]
        if arg.type in (syms.comparison, syms.not_test, syms.and_test,
                        syms.or_test, syms.test, syms.lambdef, syms.argument):
            arg = parenthesize(arg)
        if len(before) == 1:
            before = before[0]
        else:
            before = pytree.Node(syms.power, before)
        before.prefix = u" "
        n_op = Name(u"in", prefix=u" ")
        if negation:
            n_not = Name(u"not", prefix=u" ")
            n_op = pytree.Node(syms.comp_op, (n_not, n_op))
        new = pytree.Node(syms.comparison, (arg, n_op, before))
        if after:
            new = parenthesize(new)
            new = pytree.Node(syms.power, (new,) + tuple(after))
        if node.parent.type in (syms.comparison, syms.expr, syms.xor_expr,
                                syms.and_expr, syms.shift_expr,
                                syms.arith_expr, syms.term,
                                syms.factor, syms.power):
            new = parenthesize(new)
        new.prefix = prefix
        return new

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