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Current File : /lib64/python2.7/lib2to3/fixes/fix_print.py

# Copyright 2006 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.

"""Fixer for print.

Change:
    'print'          into 'print()'
    'print ...'      into 'print(...)'
    'print ... ,'    into 'print(..., end=" ")'
    'print >>x, ...' into 'print(..., file=x)'

No changes are applied if print_function is imported from __future__

"""

# Local imports
from .. import patcomp
from .. import pytree
from ..pgen2 import token
from .. import fixer_base
from ..fixer_util import Name, Call, Comma, String, is_tuple


parend_expr = patcomp.compile_pattern(
              """atom< '(' [atom|STRING|NAME] ')' >"""
              )


class FixPrint(fixer_base.BaseFix):

    BM_compatible = True

    PATTERN = """
              simple_stmt< any* bare='print' any* > | print_stmt
              """

    def transform(self, node, results):
        assert results

        bare_print = results.get("bare")

        if bare_print:
            # Special-case print all by itself
            bare_print.replace(Call(Name(u"print"), [],
                               prefix=bare_print.prefix))
            return
        assert node.children[0] == Name(u"print")
        args = node.children[1:]
        if len(args) == 1 and parend_expr.match(args[0]):
            # We don't want to keep sticking parens around an
            # already-parenthesised expression.
            return

        sep = end = file = None
        if args and args[-1] == Comma():
            args = args[:-1]
            end = " "
        if args and args[0] == pytree.Leaf(token.RIGHTSHIFT, u">>"):
            assert len(args) >= 2
            file = args[1].clone()
            args = args[3:] # Strip a possible comma after the file expression
        # Now synthesize a print(args, sep=..., end=..., file=...) node.
        l_args = [arg.clone() for arg in args]
        if l_args:
            l_args[0].prefix = u""
        if sep is not None or end is not None or file is not None:
            if sep is not None:
                self.add_kwarg(l_args, u"sep", String(repr(sep)))
            if end is not None:
                self.add_kwarg(l_args, u"end", String(repr(end)))
            if file is not None:
                self.add_kwarg(l_args, u"file", file)
        n_stmt = Call(Name(u"print"), l_args)
        n_stmt.prefix = node.prefix
        return n_stmt

    def add_kwarg(self, l_nodes, s_kwd, n_expr):
        # XXX All this prefix-setting may lose comments (though rarely)
        n_expr.prefix = u""
        n_argument = pytree.Node(self.syms.argument,
                                 (Name(s_kwd),
                                  pytree.Leaf(token.EQUAL, u"="),
                                  n_expr))
        if l_nodes:
            l_nodes.append(Comma())
            n_argument.prefix = u" "
        l_nodes.append(n_argument)

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