| Yi Kong | 8328301 | 2023-12-13 12:57:00 +0900 | [diff] [blame^] | 1 | # Copyright 2006 Google, Inc. All Rights Reserved. |
| 2 | # Licensed to PSF under a Contributor Agreement. |
| 3 | |
| 4 | """Fixer for print. |
| 5 | |
| 6 | Change: |
| 7 | 'print' into 'print()' |
| 8 | 'print ...' into 'print(...)' |
| 9 | 'print ... ,' into 'print(..., end=" ")' |
| 10 | 'print >>x, ...' into 'print(..., file=x)' |
| 11 | |
| 12 | No changes are applied if print_function is imported from __future__ |
| 13 | |
| 14 | """ |
| 15 | |
| 16 | # Local imports |
| 17 | from .. import patcomp |
| 18 | from .. import pytree |
| 19 | from ..pgen2 import token |
| 20 | from .. import fixer_base |
| 21 | from ..fixer_util import Name, Call, Comma, String |
| 22 | |
| 23 | |
| 24 | parend_expr = patcomp.compile_pattern( |
| 25 | """atom< '(' [atom|STRING|NAME] ')' >""" |
| 26 | ) |
| 27 | |
| 28 | |
| 29 | class FixPrint(fixer_base.BaseFix): |
| 30 | |
| 31 | BM_compatible = True |
| 32 | |
| 33 | PATTERN = """ |
| 34 | simple_stmt< any* bare='print' any* > | print_stmt |
| 35 | """ |
| 36 | |
| 37 | def transform(self, node, results): |
| 38 | assert results |
| 39 | |
| 40 | bare_print = results.get("bare") |
| 41 | |
| 42 | if bare_print: |
| 43 | # Special-case print all by itself |
| 44 | bare_print.replace(Call(Name("print"), [], |
| 45 | prefix=bare_print.prefix)) |
| 46 | return |
| 47 | assert node.children[0] == Name("print") |
| 48 | args = node.children[1:] |
| 49 | if len(args) == 1 and parend_expr.match(args[0]): |
| 50 | # We don't want to keep sticking parens around an |
| 51 | # already-parenthesised expression. |
| 52 | return |
| 53 | |
| 54 | sep = end = file = None |
| 55 | if args and args[-1] == Comma(): |
| 56 | args = args[:-1] |
| 57 | end = " " |
| 58 | if args and args[0] == pytree.Leaf(token.RIGHTSHIFT, ">>"): |
| 59 | assert len(args) >= 2 |
| 60 | file = args[1].clone() |
| 61 | args = args[3:] # Strip a possible comma after the file expression |
| 62 | # Now synthesize a print(args, sep=..., end=..., file=...) node. |
| 63 | l_args = [arg.clone() for arg in args] |
| 64 | if l_args: |
| 65 | l_args[0].prefix = "" |
| 66 | if sep is not None or end is not None or file is not None: |
| 67 | if sep is not None: |
| 68 | self.add_kwarg(l_args, "sep", String(repr(sep))) |
| 69 | if end is not None: |
| 70 | self.add_kwarg(l_args, "end", String(repr(end))) |
| 71 | if file is not None: |
| 72 | self.add_kwarg(l_args, "file", file) |
| 73 | n_stmt = Call(Name("print"), l_args) |
| 74 | n_stmt.prefix = node.prefix |
| 75 | return n_stmt |
| 76 | |
| 77 | def add_kwarg(self, l_nodes, s_kwd, n_expr): |
| 78 | # XXX All this prefix-setting may lose comments (though rarely) |
| 79 | n_expr.prefix = "" |
| 80 | n_argument = pytree.Node(self.syms.argument, |
| 81 | (Name(s_kwd), |
| 82 | pytree.Leaf(token.EQUAL, "="), |
| 83 | n_expr)) |
| 84 | if l_nodes: |
| 85 | l_nodes.append(Comma()) |
| 86 | n_argument.prefix = " " |
| 87 | l_nodes.append(n_argument) |