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| # 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 | |
| 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("print"), [], | |
| prefix=bare_print.prefix)) | |
| return | |
| assert node.children[0] == Name("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, ">>"): | |
| 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 = "" | |
| 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, "sep", String(repr(sep))) | |
| if end is not None: | |
| self.add_kwarg(l_args, "end", String(repr(end))) | |
| if file is not None: | |
| self.add_kwarg(l_args, "file", file) | |
| n_stmt = Call(Name("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 = "" | |
| n_argument = pytree.Node(self.syms.argument, | |
| (Name(s_kwd), | |
| pytree.Leaf(token.EQUAL, "="), | |
| n_expr)) | |
| if l_nodes: | |
| l_nodes.append(Comma()) | |
| n_argument.prefix = " " | |
| l_nodes.append(n_argument) | |