]> git.madduck.net Git - etc/vim.git/blob - src/black/mode.py

madduck's git repository

Every one of the projects in this repository is available at the canonical URL git://git.madduck.net/madduck/pub/<projectpath> — see each project's metadata for the exact URL.

All patches and comments are welcome. Please squash your changes to logical commits before using git-format-patch and git-send-email to patches@git.madduck.net. If you'd read over the Git project's submission guidelines and adhered to them, I'd be especially grateful.

SSH access, as well as push access can be individually arranged.

If you use my repositories frequently, consider adding the following snippet to ~/.gitconfig and using the third clone URL listed for each project:

[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

Replace link to Requests documentation (#3125)
[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 hashlib import sha256
8 import sys
9
10 from dataclasses import dataclass, field
11 from enum import Enum, auto
12 from operator import attrgetter
13 from typing import Dict, Set
14 from warnings import warn
15
16 if sys.version_info < (3, 8):
17     from typing_extensions import Final
18 else:
19     from typing import Final
20
21 from black.const import DEFAULT_LINE_LENGTH
22
23
24 class TargetVersion(Enum):
25     PY33 = 3
26     PY34 = 4
27     PY35 = 5
28     PY36 = 6
29     PY37 = 7
30     PY38 = 8
31     PY39 = 9
32     PY310 = 10
33     PY311 = 11
34
35
36 class Feature(Enum):
37     F_STRINGS = 2
38     NUMERIC_UNDERSCORES = 3
39     TRAILING_COMMA_IN_CALL = 4
40     TRAILING_COMMA_IN_DEF = 5
41     # The following two feature-flags are mutually exclusive, and exactly one should be
42     # set for every version of python.
43     ASYNC_IDENTIFIERS = 6
44     ASYNC_KEYWORDS = 7
45     ASSIGNMENT_EXPRESSIONS = 8
46     POS_ONLY_ARGUMENTS = 9
47     RELAXED_DECORATORS = 10
48     PATTERN_MATCHING = 11
49     UNPACKING_ON_FLOW = 12
50     ANN_ASSIGN_EXTENDED_RHS = 13
51     EXCEPT_STAR = 14
52     VARIADIC_GENERICS = 15
53     FORCE_OPTIONAL_PARENTHESES = 50
54
55     # __future__ flags
56     FUTURE_ANNOTATIONS = 51
57
58
59 FUTURE_FLAG_TO_FEATURE: Final = {
60     "annotations": Feature.FUTURE_ANNOTATIONS,
61 }
62
63
64 VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
65     TargetVersion.PY33: {Feature.ASYNC_IDENTIFIERS},
66     TargetVersion.PY34: {Feature.ASYNC_IDENTIFIERS},
67     TargetVersion.PY35: {Feature.TRAILING_COMMA_IN_CALL, Feature.ASYNC_IDENTIFIERS},
68     TargetVersion.PY36: {
69         Feature.F_STRINGS,
70         Feature.NUMERIC_UNDERSCORES,
71         Feature.TRAILING_COMMA_IN_CALL,
72         Feature.TRAILING_COMMA_IN_DEF,
73         Feature.ASYNC_IDENTIFIERS,
74     },
75     TargetVersion.PY37: {
76         Feature.F_STRINGS,
77         Feature.NUMERIC_UNDERSCORES,
78         Feature.TRAILING_COMMA_IN_CALL,
79         Feature.TRAILING_COMMA_IN_DEF,
80         Feature.ASYNC_KEYWORDS,
81         Feature.FUTURE_ANNOTATIONS,
82     },
83     TargetVersion.PY38: {
84         Feature.F_STRINGS,
85         Feature.NUMERIC_UNDERSCORES,
86         Feature.TRAILING_COMMA_IN_CALL,
87         Feature.TRAILING_COMMA_IN_DEF,
88         Feature.ASYNC_KEYWORDS,
89         Feature.FUTURE_ANNOTATIONS,
90         Feature.ASSIGNMENT_EXPRESSIONS,
91         Feature.POS_ONLY_ARGUMENTS,
92         Feature.UNPACKING_ON_FLOW,
93         Feature.ANN_ASSIGN_EXTENDED_RHS,
94     },
95     TargetVersion.PY39: {
96         Feature.F_STRINGS,
97         Feature.NUMERIC_UNDERSCORES,
98         Feature.TRAILING_COMMA_IN_CALL,
99         Feature.TRAILING_COMMA_IN_DEF,
100         Feature.ASYNC_KEYWORDS,
101         Feature.FUTURE_ANNOTATIONS,
102         Feature.ASSIGNMENT_EXPRESSIONS,
103         Feature.RELAXED_DECORATORS,
104         Feature.POS_ONLY_ARGUMENTS,
105         Feature.UNPACKING_ON_FLOW,
106         Feature.ANN_ASSIGN_EXTENDED_RHS,
107     },
108     TargetVersion.PY310: {
109         Feature.F_STRINGS,
110         Feature.NUMERIC_UNDERSCORES,
111         Feature.TRAILING_COMMA_IN_CALL,
112         Feature.TRAILING_COMMA_IN_DEF,
113         Feature.ASYNC_KEYWORDS,
114         Feature.FUTURE_ANNOTATIONS,
115         Feature.ASSIGNMENT_EXPRESSIONS,
116         Feature.RELAXED_DECORATORS,
117         Feature.POS_ONLY_ARGUMENTS,
118         Feature.UNPACKING_ON_FLOW,
119         Feature.ANN_ASSIGN_EXTENDED_RHS,
120         Feature.PATTERN_MATCHING,
121     },
122     TargetVersion.PY311: {
123         Feature.F_STRINGS,
124         Feature.NUMERIC_UNDERSCORES,
125         Feature.TRAILING_COMMA_IN_CALL,
126         Feature.TRAILING_COMMA_IN_DEF,
127         Feature.ASYNC_KEYWORDS,
128         Feature.FUTURE_ANNOTATIONS,
129         Feature.ASSIGNMENT_EXPRESSIONS,
130         Feature.RELAXED_DECORATORS,
131         Feature.POS_ONLY_ARGUMENTS,
132         Feature.UNPACKING_ON_FLOW,
133         Feature.ANN_ASSIGN_EXTENDED_RHS,
134         Feature.PATTERN_MATCHING,
135         Feature.EXCEPT_STAR,
136         Feature.VARIADIC_GENERICS,
137     },
138 }
139
140
141 def supports_feature(target_versions: Set[TargetVersion], feature: Feature) -> bool:
142     return all(feature in VERSION_TO_FEATURES[version] for version in target_versions)
143
144
145 class Preview(Enum):
146     """Individual preview style features."""
147
148     string_processing = auto()
149     remove_redundant_parens = auto()
150     one_element_subscript = auto()
151     annotation_parens = auto()
152     long_docstring_quotes_on_newline = auto()
153     remove_block_trailing_newline = auto()
154
155
156 class Deprecated(UserWarning):
157     """Visible deprecation warning."""
158
159
160 @dataclass
161 class Mode:
162     target_versions: Set[TargetVersion] = field(default_factory=set)
163     line_length: int = DEFAULT_LINE_LENGTH
164     string_normalization: bool = True
165     is_pyi: bool = False
166     is_ipynb: bool = False
167     magic_trailing_comma: bool = True
168     experimental_string_processing: bool = False
169     python_cell_magics: Set[str] = field(default_factory=set)
170     preview: bool = False
171
172     def __post_init__(self) -> None:
173         if self.experimental_string_processing:
174             warn(
175                 "`experimental string processing` has been included in `preview`"
176                 " and deprecated. Use `preview` instead.",
177                 Deprecated,
178             )
179
180     def __contains__(self, feature: Preview) -> bool:
181         """
182         Provide `Preview.FEATURE in Mode` syntax that mirrors the ``preview`` flag.
183
184         The argument is not checked and features are not differentiated.
185         They only exist to make development easier by clarifying intent.
186         """
187         if feature is Preview.string_processing:
188             return self.preview or self.experimental_string_processing
189         return self.preview
190
191     def get_cache_key(self) -> str:
192         if self.target_versions:
193             version_str = ",".join(
194                 str(version.value)
195                 for version in sorted(self.target_versions, key=attrgetter("value"))
196             )
197         else:
198             version_str = "-"
199         parts = [
200             version_str,
201             str(self.line_length),
202             str(int(self.string_normalization)),
203             str(int(self.is_pyi)),
204             str(int(self.is_ipynb)),
205             str(int(self.magic_trailing_comma)),
206             str(int(self.experimental_string_processing)),
207             str(int(self.preview)),
208             sha256((",".join(sorted(self.python_cell_magics))).encode()).hexdigest(),
209         ]
210         return ".".join(parts)