lib-python.2.7.lib2to3.fixes.fix_paren.py Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jython Show documentation

Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

There is a newer version: 2.7.4

Show newest version

"""Fixer that addes parentheses where they are required

This converts ``[x for x in 1, 2]`` to ``[x for x in (1, 2)]``."""

# By Taek Joo Kim and Benjamin Peterson

# Local imports
from .. import fixer_base
from ..fixer_util import LParen, RParen

# XXX This doesn't support nested for loops like [x for x in 1, 2 for x in 1, 2]
class FixParen(fixer_base.BaseFix):
    BM_compatible = True

    PATTERN = """
        atom< ('[' | '(')
            (listmaker< any
                comp_for<
                    'for' NAME 'in'
                    target=testlist_safe< any (',' any)+ [',']
                     >
                    [any]
                >
            >
            |
            testlist_gexp< any
                comp_for<
                    'for' NAME 'in'
                    target=testlist_safe< any (',' any)+ [',']
                     >
                    [any]
                >
            >)
        (']' | ')') >
    """

    def transform(self, node, results):
        target = results["target"]

        lparen = LParen()
        lparen.prefix = target.prefix
        target.prefix = u"" # Make it hug the parentheses
        target.insert_child(0, lparen)
        target.append_child(RParen())