/
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.
"""
from dataclasses import dataclass, field
from enum import Enum, auto
from hashlib import sha256
from operator import attrgetter
from typing import Dict, Final, Set
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
PY311 = 11
PY312 = 12
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
EXCEPT_STAR = 14
VARIADIC_GENERICS = 15
DEBUG_F_STRINGS = 16
PARENTHESIZED_CONTEXT_MANAGERS = 17
TYPE_PARAMS = 18
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.DEBUG_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.DEBUG_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.PARENTHESIZED_CONTEXT_MANAGERS,
},
TargetVersion.PY310: {
Feature.F_STRINGS,
Feature.DEBUG_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.PARENTHESIZED_CONTEXT_MANAGERS,
Feature.PATTERN_MATCHING,
},
TargetVersion.PY311: {
Feature.F_STRINGS,
Feature.DEBUG_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.PARENTHESIZED_CONTEXT_MANAGERS,
Feature.PATTERN_MATCHING,
Feature.EXCEPT_STAR,
Feature.VARIADIC_GENERICS,
},
TargetVersion.PY312: {
Feature.F_STRINGS,
Feature.DEBUG_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.PARENTHESIZED_CONTEXT_MANAGERS,
Feature.PATTERN_MATCHING,
Feature.EXCEPT_STAR,
Feature.VARIADIC_GENERICS,
Feature.TYPE_PARAMS,
},
}
def supports_feature(target_versions: Set[TargetVersion], feature: Feature) -> bool:
return all(feature in VERSION_TO_FEATURES[version] for version in target_versions)
class Preview(Enum):
"""Individual preview style features."""
hex_codes_in_unicode_sequences = auto()
# NOTE: string_processing requires wrap_long_dict_values_in_parens
# for https://github.com/psf/black/issues/3117 to be fixed.
string_processing = auto()
hug_parens_with_braces_and_square_brackets = auto()
unify_docstring_detection = auto()
no_normalize_fmt_skip_whitespace = auto()
wrap_long_dict_values_in_parens = auto()
multiline_string_handling = auto()
typed_params_trailing_comma = auto()
is_simple_lookup_for_doublestar_expression = auto()
docstring_check_for_newline = auto()
remove_redundant_guard_parens = auto()
UNSTABLE_FEATURES: Set[Preview] = {
# Many issues, see summary in https://github.com/psf/black/issues/4042
Preview.string_processing,
# See issues #3452 and #4158
Preview.wrap_long_dict_values_in_parens,
# See issue #4159
Preview.multiline_string_handling,
# See issue #4036 (crash), #4098, #4099 (proposed tweaks)
Preview.hug_parens_with_braces_and_square_brackets,
}
class Deprecated(UserWarning):
"""Visible deprecation warning."""
_MAX_CACHE_KEY_PART_LENGTH: Final = 32
@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
skip_source_first_line: bool = False
magic_trailing_comma: bool = True
python_cell_magics: Set[str] = field(default_factory=set)
preview: bool = False
unstable: bool = False
enabled_features: Set[Preview] = field(default_factory=set)
def __contains__(self, feature: Preview) -> bool:
"""
Provide `Preview.FEATURE in Mode` syntax that mirrors the ``preview`` flag.
In unstable mode, all features are enabled. In preview mode, all features
except those in UNSTABLE_FEATURES are enabled. Any features in
`self.enabled_features` are also enabled.
"""
if self.unstable:
return True
if feature in self.enabled_features:
return True
return self.preview and feature not in UNSTABLE_FEATURES
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 = "-"
if len(version_str) > _MAX_CACHE_KEY_PART_LENGTH:
version_str = sha256(version_str.encode()).hexdigest()[
:_MAX_CACHE_KEY_PART_LENGTH
]
features_and_magics = (
",".join(sorted(f.name for f in self.enabled_features))
+ "@"
+ ",".join(sorted(self.python_cell_magics))
)
if len(features_and_magics) > _MAX_CACHE_KEY_PART_LENGTH:
features_and_magics = sha256(features_and_magics.encode()).hexdigest()[
:_MAX_CACHE_KEY_PART_LENGTH
]
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.skip_source_first_line)),
str(int(self.magic_trailing_comma)),
str(int(self.preview)),
features_and_magics,
]
return ".".join(parts)