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95 lines
3.3 KiB
95 lines
3.3 KiB
5 years ago
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# Copyright 2006 Google, Inc. All Rights Reserved.
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# Licensed to PSF under a Contributor Agreement.
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"""Fixer for print.
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Change:
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"print" into "print()"
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"print ..." into "print(...)"
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"print(...)" not changed
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"print ... ," into "print(..., end=' ')"
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"print >>x, ..." into "print(..., file=x)"
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No changes are applied if print_function is imported from __future__
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"""
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# Local imports
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from lib2to3 import patcomp, pytree, fixer_base
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from lib2to3.pgen2 import token
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from lib2to3.fixer_util import Name, Call, Comma, String
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# from libmodernize import add_future
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parend_expr = patcomp.compile_pattern(
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"""atom< '(' [arith_expr|atom|power|term|STRING|NAME] ')' >"""
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)
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class FixPrint(fixer_base.BaseFix):
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BM_compatible = True
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PATTERN = """
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simple_stmt< any* bare='print' any* > | print_stmt
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"""
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def transform(self, node, results):
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assert results
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bare_print = results.get("bare")
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if bare_print:
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# Special-case print all by itself.
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bare_print.replace(Call(Name(u"print"), [],
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prefix=bare_print.prefix))
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# The "from __future__ import print_function"" declaration is added
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# by the fix_print_with_import fixer, so we skip it here.
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# add_future(node, u'print_function')
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return
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assert node.children[0] == Name(u"print")
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args = node.children[1:]
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if len(args) == 1 and parend_expr.match(args[0]):
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# We don't want to keep sticking parens around an
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# already-parenthesised expression.
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return
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sep = end = file = None
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if args and args[-1] == Comma():
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args = args[:-1]
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end = " "
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if args and args[0] == pytree.Leaf(token.RIGHTSHIFT, u">>"):
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assert len(args) >= 2
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file = args[1].clone()
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args = args[3:] # Strip a possible comma after the file expression
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# Now synthesize a print(args, sep=..., end=..., file=...) node.
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l_args = [arg.clone() for arg in args]
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if l_args:
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l_args[0].prefix = u""
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if sep is not None or end is not None or file is not None:
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if sep is not None:
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self.add_kwarg(l_args, u"sep", String(repr(sep)))
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if end is not None:
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self.add_kwarg(l_args, u"end", String(repr(end)))
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if file is not None:
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self.add_kwarg(l_args, u"file", file)
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n_stmt = Call(Name(u"print"), l_args)
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n_stmt.prefix = node.prefix
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# Note that there are corner cases where adding this future-import is
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# incorrect, for example when the file also has a 'print ()' statement
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# that was intended to print "()".
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# add_future(node, u'print_function')
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return n_stmt
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def add_kwarg(self, l_nodes, s_kwd, n_expr):
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# XXX All this prefix-setting may lose comments (though rarely)
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n_expr.prefix = u""
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n_argument = pytree.Node(self.syms.argument,
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(Name(s_kwd),
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pytree.Leaf(token.EQUAL, u"="),
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n_expr))
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if l_nodes:
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l_nodes.append(Comma())
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n_argument.prefix = u" "
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l_nodes.append(n_argument)
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