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