/
mode.py
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/
mode.py
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"""Data structures configuring Black behavior.
Mostly around Python language feature support per version and Black configuration
chosen by the user.
"""
import sys
from dataclasses import dataclass, field
from enum import Enum
from operator import attrgetter
from typing import Dict, Set
if sys.version_info < (3, 8):
from typing_extensions import Final
else:
from typing import Final
from black.const import DEFAULT_LINE_LENGTH
class TargetVersion(Enum):
PY33 = 3
PY34 = 4
PY35 = 5
PY36 = 6
PY37 = 7
PY38 = 8
PY39 = 9
PY310 = 10
class Feature(Enum):
F_STRINGS = 2
NUMERIC_UNDERSCORES = 3
TRAILING_COMMA_IN_CALL = 4
TRAILING_COMMA_IN_DEF = 5
# The following two feature-flags are mutually exclusive, and exactly one should be
# set for every version of python.
ASYNC_IDENTIFIERS = 6
ASYNC_KEYWORDS = 7
ASSIGNMENT_EXPRESSIONS = 8
POS_ONLY_ARGUMENTS = 9
RELAXED_DECORATORS = 10
PATTERN_MATCHING = 11
UNPACKING_ON_FLOW = 12
ANN_ASSIGN_EXTENDED_RHS = 13
FORCE_OPTIONAL_PARENTHESES = 50
# __future__ flags
FUTURE_ANNOTATIONS = 51
FUTURE_FLAG_TO_FEATURE: Final = {
"annotations": Feature.FUTURE_ANNOTATIONS,
}
VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
TargetVersion.PY33: {Feature.ASYNC_IDENTIFIERS},
TargetVersion.PY34: {Feature.ASYNC_IDENTIFIERS},
TargetVersion.PY35: {Feature.TRAILING_COMMA_IN_CALL, Feature.ASYNC_IDENTIFIERS},
TargetVersion.PY36: {
Feature.F_STRINGS,
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
Feature.ASYNC_IDENTIFIERS,
},
TargetVersion.PY37: {
Feature.F_STRINGS,
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
Feature.ASYNC_KEYWORDS,
Feature.FUTURE_ANNOTATIONS,
},
TargetVersion.PY38: {
Feature.F_STRINGS,
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
Feature.ASYNC_KEYWORDS,
Feature.FUTURE_ANNOTATIONS,
Feature.ASSIGNMENT_EXPRESSIONS,
Feature.POS_ONLY_ARGUMENTS,
Feature.UNPACKING_ON_FLOW,
Feature.ANN_ASSIGN_EXTENDED_RHS,
},
TargetVersion.PY39: {
Feature.F_STRINGS,
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
Feature.ASYNC_KEYWORDS,
Feature.FUTURE_ANNOTATIONS,
Feature.ASSIGNMENT_EXPRESSIONS,
Feature.RELAXED_DECORATORS,
Feature.POS_ONLY_ARGUMENTS,
Feature.UNPACKING_ON_FLOW,
Feature.ANN_ASSIGN_EXTENDED_RHS,
},
TargetVersion.PY310: {
Feature.F_STRINGS,
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
Feature.ASYNC_KEYWORDS,
Feature.FUTURE_ANNOTATIONS,
Feature.ASSIGNMENT_EXPRESSIONS,
Feature.RELAXED_DECORATORS,
Feature.POS_ONLY_ARGUMENTS,
Feature.UNPACKING_ON_FLOW,
Feature.ANN_ASSIGN_EXTENDED_RHS,
Feature.PATTERN_MATCHING,
},
}
def supports_feature(target_versions: Set[TargetVersion], feature: Feature) -> bool:
return all(feature in VERSION_TO_FEATURES[version] for version in target_versions)
@dataclass
class Mode:
target_versions: Set[TargetVersion] = field(default_factory=set)
line_length: int = DEFAULT_LINE_LENGTH
string_normalization: bool = True
is_pyi: bool = False
is_ipynb: bool = False
magic_trailing_comma: bool = True
experimental_string_processing: bool = False
def get_cache_key(self) -> str:
if self.target_versions:
version_str = ",".join(
str(version.value)
for version in sorted(self.target_versions, key=attrgetter("value"))
)
else:
version_str = "-"
parts = [
version_str,
str(self.line_length),
str(int(self.string_normalization)),
str(int(self.is_pyi)),
str(int(self.is_ipynb)),
str(int(self.magic_trailing_comma)),
str(int(self.experimental_string_processing)),
]
return ".".join(parts)