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Allow top-level starred expression on match (#2659)
[etc/vim.git] / src / black / mode.py
1 """Data structures configuring Black behavior.
2
3 Mostly around Python language feature support per version and Black configuration
4 chosen by the user.
5 """
6
7 from dataclasses import dataclass, field
8 from enum import Enum
9 from operator import attrgetter
10 from typing import Dict, Set
11
12 from black.const import DEFAULT_LINE_LENGTH
13
14
15 class TargetVersion(Enum):
16     PY27 = 2
17     PY33 = 3
18     PY34 = 4
19     PY35 = 5
20     PY36 = 6
21     PY37 = 7
22     PY38 = 8
23     PY39 = 9
24     PY310 = 10
25
26     def is_python2(self) -> bool:
27         return self is TargetVersion.PY27
28
29
30 class Feature(Enum):
31     # All string literals are unicode
32     UNICODE_LITERALS = 1
33     F_STRINGS = 2
34     NUMERIC_UNDERSCORES = 3
35     TRAILING_COMMA_IN_CALL = 4
36     TRAILING_COMMA_IN_DEF = 5
37     # The following two feature-flags are mutually exclusive, and exactly one should be
38     # set for every version of python.
39     ASYNC_IDENTIFIERS = 6
40     ASYNC_KEYWORDS = 7
41     ASSIGNMENT_EXPRESSIONS = 8
42     POS_ONLY_ARGUMENTS = 9
43     RELAXED_DECORATORS = 10
44     PATTERN_MATCHING = 11
45     FORCE_OPTIONAL_PARENTHESES = 50
46
47     # temporary for Python 2 deprecation
48     PRINT_STMT = 200
49     EXEC_STMT = 201
50     AUTOMATIC_PARAMETER_UNPACKING = 202
51     COMMA_STYLE_EXCEPT = 203
52     COMMA_STYLE_RAISE = 204
53     LONG_INT_LITERAL = 205
54     OCTAL_INT_LITERAL = 206
55     BACKQUOTE_REPR = 207
56
57
58 VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
59     TargetVersion.PY27: {
60         Feature.ASYNC_IDENTIFIERS,
61         Feature.PRINT_STMT,
62         Feature.EXEC_STMT,
63         Feature.AUTOMATIC_PARAMETER_UNPACKING,
64         Feature.COMMA_STYLE_EXCEPT,
65         Feature.COMMA_STYLE_RAISE,
66         Feature.LONG_INT_LITERAL,
67         Feature.OCTAL_INT_LITERAL,
68         Feature.BACKQUOTE_REPR,
69     },
70     TargetVersion.PY33: {Feature.UNICODE_LITERALS, Feature.ASYNC_IDENTIFIERS},
71     TargetVersion.PY34: {Feature.UNICODE_LITERALS, Feature.ASYNC_IDENTIFIERS},
72     TargetVersion.PY35: {
73         Feature.UNICODE_LITERALS,
74         Feature.TRAILING_COMMA_IN_CALL,
75         Feature.ASYNC_IDENTIFIERS,
76     },
77     TargetVersion.PY36: {
78         Feature.UNICODE_LITERALS,
79         Feature.F_STRINGS,
80         Feature.NUMERIC_UNDERSCORES,
81         Feature.TRAILING_COMMA_IN_CALL,
82         Feature.TRAILING_COMMA_IN_DEF,
83         Feature.ASYNC_IDENTIFIERS,
84     },
85     TargetVersion.PY37: {
86         Feature.UNICODE_LITERALS,
87         Feature.F_STRINGS,
88         Feature.NUMERIC_UNDERSCORES,
89         Feature.TRAILING_COMMA_IN_CALL,
90         Feature.TRAILING_COMMA_IN_DEF,
91         Feature.ASYNC_KEYWORDS,
92     },
93     TargetVersion.PY38: {
94         Feature.UNICODE_LITERALS,
95         Feature.F_STRINGS,
96         Feature.NUMERIC_UNDERSCORES,
97         Feature.TRAILING_COMMA_IN_CALL,
98         Feature.TRAILING_COMMA_IN_DEF,
99         Feature.ASYNC_KEYWORDS,
100         Feature.ASSIGNMENT_EXPRESSIONS,
101         Feature.POS_ONLY_ARGUMENTS,
102     },
103     TargetVersion.PY39: {
104         Feature.UNICODE_LITERALS,
105         Feature.F_STRINGS,
106         Feature.NUMERIC_UNDERSCORES,
107         Feature.TRAILING_COMMA_IN_CALL,
108         Feature.TRAILING_COMMA_IN_DEF,
109         Feature.ASYNC_KEYWORDS,
110         Feature.ASSIGNMENT_EXPRESSIONS,
111         Feature.RELAXED_DECORATORS,
112         Feature.POS_ONLY_ARGUMENTS,
113     },
114     TargetVersion.PY310: {
115         Feature.UNICODE_LITERALS,
116         Feature.F_STRINGS,
117         Feature.NUMERIC_UNDERSCORES,
118         Feature.TRAILING_COMMA_IN_CALL,
119         Feature.TRAILING_COMMA_IN_DEF,
120         Feature.ASYNC_KEYWORDS,
121         Feature.ASSIGNMENT_EXPRESSIONS,
122         Feature.RELAXED_DECORATORS,
123         Feature.POS_ONLY_ARGUMENTS,
124         Feature.PATTERN_MATCHING,
125     },
126 }
127
128
129 def supports_feature(target_versions: Set[TargetVersion], feature: Feature) -> bool:
130     return all(feature in VERSION_TO_FEATURES[version] for version in target_versions)
131
132
133 @dataclass
134 class Mode:
135     target_versions: Set[TargetVersion] = field(default_factory=set)
136     line_length: int = DEFAULT_LINE_LENGTH
137     string_normalization: bool = True
138     is_pyi: bool = False
139     is_ipynb: bool = False
140     magic_trailing_comma: bool = True
141     experimental_string_processing: bool = False
142
143     def get_cache_key(self) -> str:
144         if self.target_versions:
145             version_str = ",".join(
146                 str(version.value)
147                 for version in sorted(self.target_versions, key=attrgetter("value"))
148             )
149         else:
150             version_str = "-"
151         parts = [
152             version_str,
153             str(self.line_length),
154             str(int(self.string_normalization)),
155             str(int(self.is_pyi)),
156             str(int(self.is_ipynb)),
157             str(int(self.magic_trailing_comma)),
158             str(int(self.experimental_string_processing)),
159         ]
160         return ".".join(parts)