1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
"""Adjust some old Python 2 idioms to their modern counterparts.
* Change some type comparisons to isinstance() calls:
type(x) == T -> isinstance(x, T)
type(x) is T -> isinstance(x, T)
type(x) != T -> not isinstance(x, T)
type(x) is not T -> not isinstance(x, T)
* Change "while 1:" into "while True:".
* Change both
v = list(EXPR)
v.sort()
foo(v)
and the more general
v = EXPR
v.sort()
foo(v)
into
v = sorted(EXPR)
foo(v)
"""
# Author: Jacques Frechet, Collin Winter
# Local imports
from . import basefix
from .util import Call, Comma, Name, Node, syms
CMP = "(n='!=' | '==' | 'is' | n=comp_op< 'is' 'not' >)"
TYPE = "power< 'type' trailer< '(' x=any ')' > >"
class FixIdioms(basefix.BaseFix):
explicit = True # The user must ask for this fixer
PATTERN = r"""
isinstance=comparison< %s %s T=any >
|
isinstance=comparison< T=any %s %s >
|
while_stmt< 'while' while='1' ':' any+ >
|
sorted=any<
any*
simple_stmt<
expr_stmt< id1=any '='
power< list='list' trailer< '(' (not arglist<any+>) any ')' > >
>
'\n'
>
sort=
simple_stmt<
power< id2=any
trailer< '.' 'sort' > trailer< '(' ')' >
>
'\n'
>
next=any*
>
|
sorted=any<
any*
simple_stmt< expr_stmt< id1=any '=' expr=any > '\n' >
sort=
simple_stmt<
power< id2=any
trailer< '.' 'sort' > trailer< '(' ')' >
>
'\n'
>
next=any*
>
""" % (TYPE, CMP, CMP, TYPE)
def match(self, node):
r = super(FixIdioms, self).match(node)
# If we've matched one of the sort/sorted subpatterns above, we
# want to reject matches where the initial assignment and the
# subsequent .sort() call involve different identifiers.
if r and "sorted" in r:
if r["id1"] == r["id2"]:
return r
return None
return r
def transform(self, node, results):
if "isinstance" in results:
return self.transform_isinstance(node, results)
elif "while" in results:
return self.transform_while(node, results)
elif "sorted" in results:
return self.transform_sort(node, results)
else:
raise RuntimeError("Invalid match")
def transform_isinstance(self, node, results):
x = results["x"].clone() # The thing inside of type()
T = results["T"].clone() # The type being compared against
x.set_prefix("")
T.set_prefix(" ")
test = Call(Name("isinstance"), [x, Comma(), T])
if "n" in results:
test.set_prefix(" ")
test = Node(syms.not_test, [Name("not"), test])
test.set_prefix(node.get_prefix())
return test
def transform_while(self, node, results):
one = results["while"]
one.replace(Name("True", prefix=one.get_prefix()))
def transform_sort(self, node, results):
sort_stmt = results["sort"]
next_stmt = results["next"]
list_call = results.get("list")
simple_expr = results.get("expr")
if list_call:
list_call.replace(Name("sorted", prefix=list_call.get_prefix()))
elif simple_expr:
new = simple_expr.clone()
new.set_prefix("")
simple_expr.replace(Call(Name("sorted"), [new],
prefix=simple_expr.get_prefix()))
else:
raise RuntimeError("should not have reached here")
sort_stmt.remove()
if next_stmt:
next_stmt[0].set_prefix(sort_stmt.get_prefix())
|
