# 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

class FixIntern(fixer_base.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