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4d979afd84de332135ac0052c494e9be842e8352
[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, auto
9 from hashlib import sha256
10 from operator import attrgetter
11 from typing import Dict, Final, Set
12 from warnings import warn
13
14 from black.const import DEFAULT_LINE_LENGTH
15
16
17 class TargetVersion(Enum):
18     PY33 = 3
19     PY34 = 4
20     PY35 = 5
21     PY36 = 6
22     PY37 = 7
23     PY38 = 8
24     PY39 = 9
25     PY310 = 10
26     PY311 = 11
27     PY312 = 12
28
29
30 class Feature(Enum):
31     F_STRINGS = 2
32     NUMERIC_UNDERSCORES = 3
33     TRAILING_COMMA_IN_CALL = 4
34     TRAILING_COMMA_IN_DEF = 5
35     # The following two feature-flags are mutually exclusive, and exactly one should be
36     # set for every version of python.
37     ASYNC_IDENTIFIERS = 6
38     ASYNC_KEYWORDS = 7
39     ASSIGNMENT_EXPRESSIONS = 8
40     POS_ONLY_ARGUMENTS = 9
41     RELAXED_DECORATORS = 10
42     PATTERN_MATCHING = 11
43     UNPACKING_ON_FLOW = 12
44     ANN_ASSIGN_EXTENDED_RHS = 13
45     EXCEPT_STAR = 14
46     VARIADIC_GENERICS = 15
47     DEBUG_F_STRINGS = 16
48     PARENTHESIZED_CONTEXT_MANAGERS = 17
49     TYPE_PARAMS = 18
50     FORCE_OPTIONAL_PARENTHESES = 50
51
52     # __future__ flags
53     FUTURE_ANNOTATIONS = 51
54
55
56 FUTURE_FLAG_TO_FEATURE: Final = {
57     "annotations": Feature.FUTURE_ANNOTATIONS,
58 }
59
60
61 VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
62     TargetVersion.PY33: {Feature.ASYNC_IDENTIFIERS},
63     TargetVersion.PY34: {Feature.ASYNC_IDENTIFIERS},
64     TargetVersion.PY35: {Feature.TRAILING_COMMA_IN_CALL, Feature.ASYNC_IDENTIFIERS},
65     TargetVersion.PY36: {
66         Feature.F_STRINGS,
67         Feature.NUMERIC_UNDERSCORES,
68         Feature.TRAILING_COMMA_IN_CALL,
69         Feature.TRAILING_COMMA_IN_DEF,
70         Feature.ASYNC_IDENTIFIERS,
71     },
72     TargetVersion.PY37: {
73         Feature.F_STRINGS,
74         Feature.NUMERIC_UNDERSCORES,
75         Feature.TRAILING_COMMA_IN_CALL,
76         Feature.TRAILING_COMMA_IN_DEF,
77         Feature.ASYNC_KEYWORDS,
78         Feature.FUTURE_ANNOTATIONS,
79     },
80     TargetVersion.PY38: {
81         Feature.F_STRINGS,
82         Feature.DEBUG_F_STRINGS,
83         Feature.NUMERIC_UNDERSCORES,
84         Feature.TRAILING_COMMA_IN_CALL,
85         Feature.TRAILING_COMMA_IN_DEF,
86         Feature.ASYNC_KEYWORDS,
87         Feature.FUTURE_ANNOTATIONS,
88         Feature.ASSIGNMENT_EXPRESSIONS,
89         Feature.POS_ONLY_ARGUMENTS,
90         Feature.UNPACKING_ON_FLOW,
91         Feature.ANN_ASSIGN_EXTENDED_RHS,
92     },
93     TargetVersion.PY39: {
94         Feature.F_STRINGS,
95         Feature.DEBUG_F_STRINGS,
96         Feature.NUMERIC_UNDERSCORES,
97         Feature.TRAILING_COMMA_IN_CALL,
98         Feature.TRAILING_COMMA_IN_DEF,
99         Feature.ASYNC_KEYWORDS,
100         Feature.FUTURE_ANNOTATIONS,
101         Feature.ASSIGNMENT_EXPRESSIONS,
102         Feature.RELAXED_DECORATORS,
103         Feature.POS_ONLY_ARGUMENTS,
104         Feature.UNPACKING_ON_FLOW,
105         Feature.ANN_ASSIGN_EXTENDED_RHS,
106         Feature.PARENTHESIZED_CONTEXT_MANAGERS,
107     },
108     TargetVersion.PY310: {
109         Feature.F_STRINGS,
110         Feature.DEBUG_F_STRINGS,
111         Feature.NUMERIC_UNDERSCORES,
112         Feature.TRAILING_COMMA_IN_CALL,
113         Feature.TRAILING_COMMA_IN_DEF,
114         Feature.ASYNC_KEYWORDS,
115         Feature.FUTURE_ANNOTATIONS,
116         Feature.ASSIGNMENT_EXPRESSIONS,
117         Feature.RELAXED_DECORATORS,
118         Feature.POS_ONLY_ARGUMENTS,
119         Feature.UNPACKING_ON_FLOW,
120         Feature.ANN_ASSIGN_EXTENDED_RHS,
121         Feature.PARENTHESIZED_CONTEXT_MANAGERS,
122         Feature.PATTERN_MATCHING,
123     },
124     TargetVersion.PY311: {
125         Feature.F_STRINGS,
126         Feature.DEBUG_F_STRINGS,
127         Feature.NUMERIC_UNDERSCORES,
128         Feature.TRAILING_COMMA_IN_CALL,
129         Feature.TRAILING_COMMA_IN_DEF,
130         Feature.ASYNC_KEYWORDS,
131         Feature.FUTURE_ANNOTATIONS,
132         Feature.ASSIGNMENT_EXPRESSIONS,
133         Feature.RELAXED_DECORATORS,
134         Feature.POS_ONLY_ARGUMENTS,
135         Feature.UNPACKING_ON_FLOW,
136         Feature.ANN_ASSIGN_EXTENDED_RHS,
137         Feature.PARENTHESIZED_CONTEXT_MANAGERS,
138         Feature.PATTERN_MATCHING,
139         Feature.EXCEPT_STAR,
140         Feature.VARIADIC_GENERICS,
141     },
142     TargetVersion.PY312: {
143         Feature.F_STRINGS,
144         Feature.DEBUG_F_STRINGS,
145         Feature.NUMERIC_UNDERSCORES,
146         Feature.TRAILING_COMMA_IN_CALL,
147         Feature.TRAILING_COMMA_IN_DEF,
148         Feature.ASYNC_KEYWORDS,
149         Feature.FUTURE_ANNOTATIONS,
150         Feature.ASSIGNMENT_EXPRESSIONS,
151         Feature.RELAXED_DECORATORS,
152         Feature.POS_ONLY_ARGUMENTS,
153         Feature.UNPACKING_ON_FLOW,
154         Feature.ANN_ASSIGN_EXTENDED_RHS,
155         Feature.PARENTHESIZED_CONTEXT_MANAGERS,
156         Feature.PATTERN_MATCHING,
157         Feature.EXCEPT_STAR,
158         Feature.VARIADIC_GENERICS,
159         Feature.TYPE_PARAMS,
160     },
161 }
162
163
164 def supports_feature(target_versions: Set[TargetVersion], feature: Feature) -> bool:
165     return all(feature in VERSION_TO_FEATURES[version] for version in target_versions)
166
167
168 class Preview(Enum):
169     """Individual preview style features."""
170
171     add_trailing_comma_consistently = auto()
172     blank_line_after_nested_stub_class = auto()
173     hex_codes_in_unicode_sequences = auto()
174     improved_async_statements_handling = auto()
175     multiline_string_handling = auto()
176     no_blank_line_before_class_docstring = auto()
177     prefer_splitting_right_hand_side_of_assignments = auto()
178     # NOTE: string_processing requires wrap_long_dict_values_in_parens
179     # for https://github.com/psf/black/issues/3117 to be fixed.
180     string_processing = auto()
181     parenthesize_conditional_expressions = auto()
182     skip_magic_trailing_comma_in_subscript = auto()
183     wrap_long_dict_values_in_parens = auto()
184     wrap_multiple_context_managers_in_parens = auto()
185
186
187 class Deprecated(UserWarning):
188     """Visible deprecation warning."""
189
190
191 @dataclass
192 class Mode:
193     target_versions: Set[TargetVersion] = field(default_factory=set)
194     line_length: int = DEFAULT_LINE_LENGTH
195     string_normalization: bool = True
196     is_pyi: bool = False
197     is_ipynb: bool = False
198     skip_source_first_line: bool = False
199     magic_trailing_comma: bool = True
200     experimental_string_processing: bool = False
201     python_cell_magics: Set[str] = field(default_factory=set)
202     preview: bool = False
203
204     def __post_init__(self) -> None:
205         if self.experimental_string_processing:
206             warn(
207                 "`experimental string processing` has been included in `preview`"
208                 " and deprecated. Use `preview` instead.",
209                 Deprecated,
210             )
211
212     def __contains__(self, feature: Preview) -> bool:
213         """
214         Provide `Preview.FEATURE in Mode` syntax that mirrors the ``preview`` flag.
215
216         The argument is not checked and features are not differentiated.
217         They only exist to make development easier by clarifying intent.
218         """
219         if feature is Preview.string_processing:
220             return self.preview or self.experimental_string_processing
221         return self.preview
222
223     def get_cache_key(self) -> str:
224         if self.target_versions:
225             version_str = ",".join(
226                 str(version.value)
227                 for version in sorted(self.target_versions, key=attrgetter("value"))
228             )
229         else:
230             version_str = "-"
231         parts = [
232             version_str,
233             str(self.line_length),
234             str(int(self.string_normalization)),
235             str(int(self.is_pyi)),
236             str(int(self.is_ipynb)),
237             str(int(self.skip_source_first_line)),
238             str(int(self.magic_trailing_comma)),
239             str(int(self.experimental_string_processing)),
240             str(int(self.preview)),
241             sha256((",".join(sorted(self.python_cell_magics))).encode()).hexdigest(),
242         ]
243         return ".".join(parts)