# 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 fixer_base
from ..fixer_util import Name, Attr, touch_import


class FixIntern(fixer_base.BaseFix):
BM_compatible = True
order = "pre"

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(u"sys"), Name(u"intern")) +
[pytree.Node(syms.trailer,
[results["lpar"].clone(),
newarglist,
results["rpar"].clone()])] + after)
new.prefix = node.prefix
touch_import(None, u'sys', node)
return new