cpython/Lib/lib2to3/fixes/fix_intern.py

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# Copyright 2006 Georg Brandl.
# Licensed to PSF under a Contributor Agreement.
"""Fixer for intern().
intern(s) -> sys.intern(s)"""
# Local imports
from .. import pytree
from . import basefix
from .util import Name, Attr
class FixIntern(basefix.BaseFix):
PATTERN = """
power< 'intern'
trailer< lpar='('
( not(arglist | argument<any '=' any>) obj=any
| obj=arglist<(not argument<any '=' any>) any ','> )
rpar=')' >
after=any*
>
"""
def transform(self, node, results):
syms = self.syms
obj = results["obj"].clone()
if obj.type == syms.arglist:
newarglist = obj.clone()
else:
newarglist = pytree.Node(syms.arglist, [obj.clone()])
after = results["after"]
if after:
after = [n.clone() for n in after]
new = pytree.Node(syms.power,
Attr(Name("sys"), Name("intern")) +
[pytree.Node(syms.trailer,
[results["lpar"].clone(),
newarglist,
results["rpar"].clone()])] + after)
new.set_prefix(node.get_prefix())
return new