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annotate env/lib/python3.7/site-packages/libfuturize/fixes/fix_print.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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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(...)" not changed
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10 "print ... ," into "print(..., end=' ')"
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11 "print >>x, ..." into "print(..., file=x)"
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12
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13 No changes are applied if print_function is imported from __future__
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14
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15 """
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16
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17 # Local imports
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18 from lib2to3 import patcomp, pytree, fixer_base
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19 from lib2to3.pgen2 import token
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20 from lib2to3.fixer_util import Name, Call, Comma, String
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21 # from libmodernize import add_future
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22
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23 parend_expr = patcomp.compile_pattern(
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24 """atom< '(' [arith_expr|atom|power|term|STRING|NAME] ')' >"""
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25 )
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26
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27
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28 class FixPrint(fixer_base.BaseFix):
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29
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30 BM_compatible = True
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31
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32 PATTERN = """
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33 simple_stmt< any* bare='print' any* > | print_stmt
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34 """
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35
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36 def transform(self, node, results):
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37 assert results
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38
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39 bare_print = results.get("bare")
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40
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41 if bare_print:
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42 # Special-case print all by itself.
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43 bare_print.replace(Call(Name(u"print"), [],
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44 prefix=bare_print.prefix))
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45 # The "from __future__ import print_function"" declaration is added
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46 # by the fix_print_with_import fixer, so we skip it here.
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47 # add_future(node, u'print_function')
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48 return
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49 assert node.children[0] == Name(u"print")
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50 args = node.children[1:]
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51 if len(args) == 1 and parend_expr.match(args[0]):
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52 # We don't want to keep sticking parens around an
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53 # already-parenthesised expression.
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54 return
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55
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56 sep = end = file = None
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57 if args and args[-1] == Comma():
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58 args = args[:-1]
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59 end = " "
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60 if args and args[0] == pytree.Leaf(token.RIGHTSHIFT, u">>"):
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61 assert len(args) >= 2
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62 file = args[1].clone()
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63 args = args[3:] # Strip a possible comma after the file expression
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64 # Now synthesize a print(args, sep=..., end=..., file=...) node.
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65 l_args = [arg.clone() for arg in args]
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66 if l_args:
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67 l_args[0].prefix = u""
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68 if sep is not None or end is not None or file is not None:
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69 if sep is not None:
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70 self.add_kwarg(l_args, u"sep", String(repr(sep)))
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71 if end is not None:
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72 self.add_kwarg(l_args, u"end", String(repr(end)))
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73 if file is not None:
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74 self.add_kwarg(l_args, u"file", file)
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75 n_stmt = Call(Name(u"print"), l_args)
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76 n_stmt.prefix = node.prefix
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77
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78 # Note that there are corner cases where adding this future-import is
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79 # incorrect, for example when the file also has a 'print ()' statement
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80 # that was intended to print "()".
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81 # add_future(node, u'print_function')
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82 return n_stmt
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83
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84 def add_kwarg(self, l_nodes, s_kwd, n_expr):
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85 # XXX All this prefix-setting may lose comments (though rarely)
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86 n_expr.prefix = u""
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87 n_argument = pytree.Node(self.syms.argument,
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88 (Name(s_kwd),
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89 pytree.Leaf(token.EQUAL, u"="),
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90 n_expr))
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91 if l_nodes:
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92 l_nodes.append(Comma())
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93 n_argument.prefix = u" "
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94 l_nodes.append(n_argument)