| # 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) |
