| 1 | # Copyright 2006 Google, Inc. All Rights Reserved.
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| 2 | # Licensed to PSF under a Contributor Agreement.
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| 3 |
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| 4 | """Fixer for print.
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| 5 |
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| 6 | Change:
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| 7 | 'print' into 'print()'
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| 8 | 'print ...' into 'print(...)'
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| 9 | 'print ... ,' into 'print(..., end=" ")'
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| 10 | 'print >>x, ...' into 'print(..., file=x)'
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| 11 |
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| 12 | No changes are applied if print_function is imported from __future__
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| 13 |
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| 14 | """
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| 15 |
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| 16 | # Local imports
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| 17 | from .. import patcomp
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| 18 | from .. import pytree
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| 19 | from ..pgen2 import token
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| 20 | from .. import fixer_base
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| 21 | from ..fixer_util import Name, Call, Comma, String, is_tuple
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| 22 |
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| 23 |
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| 24 | parend_expr = patcomp.compile_pattern(
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| 25 | """atom< '(' [atom|STRING|NAME] ')' >"""
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| 26 | )
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| 27 |
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| 28 |
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| 29 | class FixPrint(fixer_base.BaseFix):
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| 30 |
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| 31 | BM_compatible = True
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| 32 |
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| 33 | PATTERN = """
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| 34 | simple_stmt< any* bare='print' any* > | print_stmt
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| 35 | """
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| 36 |
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| 37 | def transform(self, node, results):
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| 38 | assert results
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| 39 |
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| 40 | bare_print = results.get("bare")
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| 41 |
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| 42 | if bare_print:
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| 43 | # Special-case print all by itself
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| 44 | bare_print.replace(Call(Name(u"print"), [],
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| 45 | prefix=bare_print.prefix))
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| 46 | return
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| 47 | assert node.children[0] == Name(u"print")
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| 48 | args = node.children[1:]
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| 49 | if len(args) == 1 and parend_expr.match(args[0]):
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| 50 | # We don't want to keep sticking parens around an
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| 51 | # already-parenthesised expression.
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| 52 | return
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| 53 |
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| 54 | sep = end = file = None
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| 55 | if args and args[-1] == Comma():
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| 56 | args = args[:-1]
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| 57 | end = " "
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| 58 | if args and args[0] == pytree.Leaf(token.RIGHTSHIFT, u">>"):
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| 59 | assert len(args) >= 2
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| 60 | file = args[1].clone()
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| 61 | args = args[3:] # Strip a possible comma after the file expression
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| 62 | # Now synthesize a print(args, sep=..., end=..., file=...) node.
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| 63 | l_args = [arg.clone() for arg in args]
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| 64 | if l_args:
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| 65 | l_args[0].prefix = u""
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| 66 | if sep is not None or end is not None or file is not None:
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| 67 | if sep is not None:
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| 68 | self.add_kwarg(l_args, u"sep", String(repr(sep)))
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| 69 | if end is not None:
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| 70 | self.add_kwarg(l_args, u"end", String(repr(end)))
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| 71 | if file is not None:
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| 72 | self.add_kwarg(l_args, u"file", file)
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| 73 | n_stmt = Call(Name(u"print"), l_args)
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| 74 | n_stmt.prefix = node.prefix
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| 75 | return n_stmt
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| 76 |
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| 77 | def add_kwarg(self, l_nodes, s_kwd, n_expr):
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| 78 | # XXX All this prefix-setting may lose comments (though rarely)
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| 79 | n_expr.prefix = u""
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| 80 | n_argument = pytree.Node(self.syms.argument,
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| 81 | (Name(s_kwd),
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| 82 | pytree.Leaf(token.EQUAL, u"="),
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| 83 | n_expr))
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| 84 | if l_nodes:
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| 85 | l_nodes.append(Comma())
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| 86 | n_argument.prefix = u" "
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| 87 | l_nodes.append(n_argument)
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