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109 lines
3.1 KiB
Python
109 lines
3.1 KiB
Python
# Copyright 2006 Google, Inc. All Rights Reserved.
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# Licensed to PSF under a Contributor Agreement.
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"""Fixer for has_key().
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Calls to .has_key() methods are expressed in terms of the 'in'
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operator:
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d.has_key(k) -> k in d
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CAVEATS:
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1) While the primary target of this fixer is dict.has_key(), the
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fixer will change any has_key() method call, regardless of its
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class.
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2) Cases like this will not be converted:
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m = d.has_key
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if m(k):
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...
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Only *calls* to has_key() are converted. While it is possible to
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convert the above to something like
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m = d.__contains__
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if m(k):
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...
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this is currently not done.
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"""
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# Local imports
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from .. import pytree
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from .. import fixer_base
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from ..fixer_util import Name, parenthesize
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class FixHasKey(fixer_base.BaseFix):
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BM_compatible = True
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PATTERN = """
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anchor=power<
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before=any+
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trailer< '.' 'has_key' >
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trailer<
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'('
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( not(arglist | argument<any '=' any>) arg=any
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| arglist<(not argument<any '=' any>) arg=any ','>
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)
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')'
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>
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after=any*
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>
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negation=not_test<
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'not'
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anchor=power<
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before=any+
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trailer< '.' 'has_key' >
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trailer<
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'('
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( not(arglist | argument<any '=' any>) arg=any
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| arglist<(not argument<any '=' any>) arg=any ','>
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)
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')'
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>
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>
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>
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"""
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def transform(self, node, results):
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assert results
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syms = self.syms
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if (node.parent.type == syms.not_test and
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self.pattern.match(node.parent)):
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# Don't transform a node matching the first alternative of the
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# pattern when its parent matches the second alternative
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return None
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negation = results.get("negation")
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anchor = results["anchor"]
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prefix = node.prefix
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before = [n.clone() for n in results["before"]]
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arg = results["arg"].clone()
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after = results.get("after")
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if after:
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after = [n.clone() for n in after]
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if arg.type in (syms.comparison, syms.not_test, syms.and_test,
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syms.or_test, syms.test, syms.lambdef, syms.argument):
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arg = parenthesize(arg)
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if len(before) == 1:
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before = before[0]
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else:
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before = pytree.Node(syms.power, before)
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before.prefix = " "
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n_op = Name("in", prefix=" ")
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if negation:
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n_not = Name("not", prefix=" ")
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n_op = pytree.Node(syms.comp_op, (n_not, n_op))
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new = pytree.Node(syms.comparison, (arg, n_op, before))
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if after:
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new = parenthesize(new)
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new = pytree.Node(syms.power, (new,) + tuple(after))
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if node.parent.type in (syms.comparison, syms.expr, syms.xor_expr,
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syms.and_expr, syms.shift_expr,
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syms.arith_expr, syms.term,
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syms.factor, syms.power):
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new = parenthesize(new)
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new.prefix = prefix
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return new
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