X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/e4340f5c3edcfc2b7ee1ebad4521eeb6deb616df..4931ddd0b1f84910790bebcd86c2147d1ddcf1e1:/black.py?ds=sidebyside
diff --git a/black.py b/black.py
index f51b10e..18d60c0 100644
--- a/black.py
+++ b/black.py
@@ -2,24 +2,26 @@ import asyncio
from asyncio.base_events import BaseEventLoop
from concurrent.futures import Executor, ProcessPoolExecutor
from datetime import datetime
-from enum import Enum, Flag
+from enum import Enum
from functools import lru_cache, partial, wraps
import io
-import keyword
+import itertools
import logging
-from multiprocessing import Manager
+from multiprocessing import Manager, freeze_support
import os
from pathlib import Path
import pickle
import re
import signal
import sys
+import tempfile
import tokenize
from typing import (
Any,
Callable,
Collection,
Dict,
+ Generator,
Generic,
Iterable,
Iterator,
@@ -29,14 +31,13 @@ from typing import (
Sequence,
Set,
Tuple,
- Type,
TypeVar,
Union,
cast,
)
from appdirs import user_cache_dir
-from attr import dataclass, Factory
+from attr import dataclass, evolve, Factory
import click
import toml
@@ -44,13 +45,14 @@ import toml
from blib2to3.pytree import Node, Leaf, type_repr
from blib2to3 import pygram, pytree
from blib2to3.pgen2 import driver, token
+from blib2to3.pgen2.grammar import Grammar
from blib2to3.pgen2.parse import ParseError
-__version__ = "18.6b2"
+__version__ = "19.3b0"
DEFAULT_LINE_LENGTH = 88
DEFAULT_EXCLUDES = (
- r"/(\.git|\.hg|\.mypy_cache|\.tox|\.venv|_build|buck-out|build|dist)/"
+ r"/(\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist)/"
)
DEFAULT_INCLUDES = r"\.pyi?$"
CACHE_DIR = Path(user_cache_dir("black", version=__version__))
@@ -66,7 +68,7 @@ LeafID = int
Priority = int
Index = int
LN = Union[Leaf, Node]
-SplitFunc = Callable[["Line", bool], Iterator["Line"]]
+SplitFunc = Callable[["Line", Collection["Feature"]], Iterator["Line"]]
Timestamp = float
FileSize = int
CacheInfo = Tuple[Timestamp, FileSize]
@@ -79,54 +81,27 @@ syms = pygram.python_symbols
class NothingChanged(UserWarning):
- """Raised by :func:`format_file` when reformatted code is the same as source."""
+ """Raised when reformatted code is the same as source."""
class CannotSplit(Exception):
- """A readable split that fits the allotted line length is impossible.
+ """A readable split that fits the allotted line length is impossible."""
- Raised by :func:`left_hand_split`, :func:`right_hand_split`, and
- :func:`delimiter_split`.
- """
-
-
-class FormatError(Exception):
- """Base exception for `# fmt: on` and `# fmt: off` handling.
-
- It holds the number of bytes of the prefix consumed before the format
- control comment appeared.
- """
-
- def __init__(self, consumed: int) -> None:
- super().__init__(consumed)
- self.consumed = consumed
-
- def trim_prefix(self, leaf: Leaf) -> None:
- leaf.prefix = leaf.prefix[self.consumed :]
-
- def leaf_from_consumed(self, leaf: Leaf) -> Leaf:
- """Returns a new Leaf from the consumed part of the prefix."""
- unformatted_prefix = leaf.prefix[: self.consumed]
- return Leaf(token.NEWLINE, unformatted_prefix)
-
-
-class FormatOn(FormatError):
- """Found a comment like `# fmt: on` in the file."""
-
-class FormatOff(FormatError):
- """Found a comment like `# fmt: off` in the file."""
+class InvalidInput(ValueError):
+ """Raised when input source code fails all parse attempts."""
class WriteBack(Enum):
NO = 0
YES = 1
DIFF = 2
+ CHECK = 3
@classmethod
def from_configuration(cls, *, check: bool, diff: bool) -> "WriteBack":
if check and not diff:
- return cls.NO
+ return cls.CHECK
return cls.DIFF if diff else cls.YES
@@ -137,24 +112,86 @@ class Changed(Enum):
YES = 2
-class FileMode(Flag):
- AUTO_DETECT = 0
- PYTHON36 = 1
- PYI = 2
- NO_STRING_NORMALIZATION = 4
+class TargetVersion(Enum):
+ PY27 = 2
+ PY33 = 3
+ PY34 = 4
+ PY35 = 5
+ PY36 = 6
+ PY37 = 7
+ PY38 = 8
+
+ def is_python2(self) -> bool:
+ return self is TargetVersion.PY27
+
+
+PY36_VERSIONS = {TargetVersion.PY36, TargetVersion.PY37, TargetVersion.PY38}
+
+
+class Feature(Enum):
+ # All string literals are unicode
+ UNICODE_LITERALS = 1
+ F_STRINGS = 2
+ NUMERIC_UNDERSCORES = 3
+ TRAILING_COMMA_IN_CALL = 4
+ TRAILING_COMMA_IN_DEF = 5
+
+
+VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
+ TargetVersion.PY27: set(),
+ TargetVersion.PY33: {Feature.UNICODE_LITERALS},
+ TargetVersion.PY34: {Feature.UNICODE_LITERALS},
+ TargetVersion.PY35: {Feature.UNICODE_LITERALS, Feature.TRAILING_COMMA_IN_CALL},
+ TargetVersion.PY36: {
+ Feature.UNICODE_LITERALS,
+ Feature.F_STRINGS,
+ Feature.NUMERIC_UNDERSCORES,
+ Feature.TRAILING_COMMA_IN_CALL,
+ Feature.TRAILING_COMMA_IN_DEF,
+ },
+ TargetVersion.PY37: {
+ Feature.UNICODE_LITERALS,
+ Feature.F_STRINGS,
+ Feature.NUMERIC_UNDERSCORES,
+ Feature.TRAILING_COMMA_IN_CALL,
+ Feature.TRAILING_COMMA_IN_DEF,
+ },
+ TargetVersion.PY38: {
+ Feature.UNICODE_LITERALS,
+ Feature.F_STRINGS,
+ Feature.NUMERIC_UNDERSCORES,
+ Feature.TRAILING_COMMA_IN_CALL,
+ Feature.TRAILING_COMMA_IN_DEF,
+ },
+}
+
+
+@dataclass
+class FileMode:
+ target_versions: Set[TargetVersion] = Factory(set)
+ line_length: int = DEFAULT_LINE_LENGTH
+ string_normalization: bool = True
+ is_pyi: 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=lambda v: v.value)
+ )
+ else:
+ version_str = "-"
+ parts = [
+ version_str,
+ str(self.line_length),
+ str(int(self.string_normalization)),
+ str(int(self.is_pyi)),
+ ]
+ return ".".join(parts)
- @classmethod
- def from_configuration(
- cls, *, py36: bool, pyi: bool, skip_string_normalization: bool
- ) -> "FileMode":
- mode = cls.AUTO_DETECT
- if py36:
- mode |= cls.PYTHON36
- if pyi:
- mode |= cls.PYI
- if skip_string_normalization:
- mode |= cls.NO_STRING_NORMALIZATION
- return mode
+
+def supports_feature(target_versions: Set[TargetVersion], feature: Feature) -> bool:
+ return all(feature in VERSION_TO_FEATURES[version] for version in target_versions)
def read_pyproject_toml(
@@ -178,7 +215,9 @@ def read_pyproject_toml(
pyproject_toml = toml.load(value)
config = pyproject_toml.get("tool", {}).get("black", {})
except (toml.TomlDecodeError, OSError) as e:
- raise click.BadOptionUsage(f"Error reading configuration file: {e}", ctx)
+ raise click.FileError(
+ filename=value, hint=f"Error reading configuration file: {e}"
+ )
if not config:
return None
@@ -192,21 +231,34 @@ def read_pyproject_toml(
@click.command(context_settings=dict(help_option_names=["-h", "--help"]))
+@click.option("-c", "--code", type=str, help="Format the code passed in as a string.")
@click.option(
"-l",
"--line-length",
type=int,
default=DEFAULT_LINE_LENGTH,
- help="How many character per line to allow.",
+ help="How many characters per line to allow.",
show_default=True,
)
+@click.option(
+ "-t",
+ "--target-version",
+ type=click.Choice([v.name.lower() for v in TargetVersion]),
+ callback=lambda c, p, v: [TargetVersion[val.upper()] for val in v],
+ multiple=True,
+ help=(
+ "Python versions that should be supported by Black's output. [default: "
+ "per-file auto-detection]"
+ ),
+)
@click.option(
"--py36",
is_flag=True,
help=(
"Allow using Python 3.6-only syntax on all input files. This will put "
"trailing commas in function signatures and calls also after *args and "
- "**kwargs. [default: per-file auto-detection]"
+ "**kwargs. Deprecated; use --target-version instead. "
+ "[default: per-file auto-detection]"
),
)
@click.option(
@@ -306,7 +358,9 @@ def read_pyproject_toml(
@click.pass_context
def main(
ctx: click.Context,
+ code: Optional[str],
line_length: int,
+ target_version: List[TargetVersion],
check: bool,
diff: bool,
fast: bool,
@@ -322,11 +376,32 @@ def main(
) -> None:
"""The uncompromising code formatter."""
write_back = WriteBack.from_configuration(check=check, diff=diff)
- mode = FileMode.from_configuration(
- py36=py36, pyi=pyi, skip_string_normalization=skip_string_normalization
+ if target_version:
+ if py36:
+ err(f"Cannot use both --target-version and --py36")
+ ctx.exit(2)
+ else:
+ versions = set(target_version)
+ elif py36:
+ err(
+ "--py36 is deprecated and will be removed in a future version. "
+ "Use --target-version py36 instead."
+ )
+ versions = PY36_VERSIONS
+ else:
+ # We'll autodetect later.
+ versions = set()
+ mode = FileMode(
+ target_versions=versions,
+ line_length=line_length,
+ is_pyi=pyi,
+ string_normalization=not skip_string_normalization,
)
if config and verbose:
out(f"Using configuration from {config}.", bold=False, fg="blue")
+ if code is not None:
+ print(format_str(code, mode=mode))
+ ctx.exit(0)
try:
include_regex = re_compile_maybe_verbose(include)
except re.error:
@@ -359,30 +434,16 @@ def main(
if len(sources) == 1:
reformat_one(
src=sources.pop(),
- line_length=line_length,
fast=fast,
write_back=write_back,
mode=mode,
report=report,
)
else:
- loop = asyncio.get_event_loop()
- executor = ProcessPoolExecutor(max_workers=os.cpu_count())
- try:
- loop.run_until_complete(
- schedule_formatting(
- sources=sources,
- line_length=line_length,
- fast=fast,
- write_back=write_back,
- mode=mode,
- report=report,
- loop=loop,
- executor=executor,
- )
- )
- finally:
- shutdown(loop)
+ reformat_many(
+ sources=sources, fast=fast, write_back=write_back, mode=mode, report=report
+ )
+
if verbose or not quiet:
bang = "ð¥ ð ð¥" if report.return_code else "⨠ð° â¨"
out(f"All done! {bang}")
@@ -391,12 +452,7 @@ def main(
def reformat_one(
- src: Path,
- line_length: int,
- fast: bool,
- write_back: WriteBack,
- mode: FileMode,
- report: "Report",
+ src: Path, fast: bool, write_back: WriteBack, mode: FileMode, report: "Report"
) -> None:
"""Reformat a single file under `src` without spawning child processes.
@@ -407,35 +463,60 @@ def reformat_one(
try:
changed = Changed.NO
if not src.is_file() and str(src) == "-":
- if format_stdin_to_stdout(
- line_length=line_length, fast=fast, write_back=write_back, mode=mode
- ):
+ if format_stdin_to_stdout(fast=fast, write_back=write_back, mode=mode):
changed = Changed.YES
else:
cache: Cache = {}
if write_back != WriteBack.DIFF:
- cache = read_cache(line_length, mode)
+ cache = read_cache(mode)
res_src = src.resolve()
if res_src in cache and cache[res_src] == get_cache_info(res_src):
changed = Changed.CACHED
if changed is not Changed.CACHED and format_file_in_place(
- src,
- line_length=line_length,
- fast=fast,
- write_back=write_back,
- mode=mode,
+ src, fast=fast, write_back=write_back, mode=mode
):
changed = Changed.YES
- if write_back == WriteBack.YES and changed is not Changed.NO:
- write_cache(cache, [src], line_length, mode)
+ if (write_back is WriteBack.YES and changed is not Changed.CACHED) or (
+ write_back is WriteBack.CHECK and changed is Changed.NO
+ ):
+ write_cache(cache, [src], mode)
report.done(src, changed)
except Exception as exc:
report.failed(src, str(exc))
+def reformat_many(
+ sources: Set[Path],
+ fast: bool,
+ write_back: WriteBack,
+ mode: FileMode,
+ report: "Report",
+) -> None:
+ """Reformat multiple files using a ProcessPoolExecutor."""
+ loop = asyncio.get_event_loop()
+ worker_count = os.cpu_count()
+ if sys.platform == "win32":
+ # Work around https://bugs.python.org/issue26903
+ worker_count = min(worker_count, 61)
+ executor = ProcessPoolExecutor(max_workers=worker_count)
+ try:
+ loop.run_until_complete(
+ schedule_formatting(
+ sources=sources,
+ fast=fast,
+ write_back=write_back,
+ mode=mode,
+ report=report,
+ loop=loop,
+ executor=executor,
+ )
+ )
+ finally:
+ shutdown(loop)
+
+
async def schedule_formatting(
sources: Set[Path],
- line_length: int,
fast: bool,
write_back: WriteBack,
mode: FileMode,
@@ -452,79 +533,80 @@ async def schedule_formatting(
"""
cache: Cache = {}
if write_back != WriteBack.DIFF:
- cache = read_cache(line_length, mode)
+ cache = read_cache(mode)
sources, cached = filter_cached(cache, sources)
for src in sorted(cached):
report.done(src, Changed.CACHED)
+ if not sources:
+ return
+
cancelled = []
- formatted = []
- if sources:
- lock = None
- if write_back == WriteBack.DIFF:
- # For diff output, we need locks to ensure we don't interleave output
- # from different processes.
- manager = Manager()
- lock = manager.Lock()
- tasks = {
+ sources_to_cache = []
+ lock = None
+ if write_back == WriteBack.DIFF:
+ # For diff output, we need locks to ensure we don't interleave output
+ # from different processes.
+ manager = Manager()
+ lock = manager.Lock()
+ tasks = {
+ asyncio.ensure_future(
loop.run_in_executor(
- executor,
- format_file_in_place,
- src,
- line_length,
- fast,
- write_back,
- mode,
- lock,
- ): src
- for src in sorted(sources)
- }
- pending: Iterable[asyncio.Task] = tasks.keys()
- try:
- loop.add_signal_handler(signal.SIGINT, cancel, pending)
- loop.add_signal_handler(signal.SIGTERM, cancel, pending)
- except NotImplementedError:
- # There are no good alternatives for these on Windows
- pass
- while pending:
- done, _ = await asyncio.wait(pending, return_when=asyncio.FIRST_COMPLETED)
- for task in done:
- src = tasks.pop(task)
- if task.cancelled():
- cancelled.append(task)
- elif task.exception():
- report.failed(src, str(task.exception()))
- else:
- formatted.append(src)
- report.done(src, Changed.YES if task.result() else Changed.NO)
+ executor, format_file_in_place, src, fast, mode, write_back, lock
+ )
+ ): src
+ for src in sorted(sources)
+ }
+ pending: Iterable[asyncio.Future] = tasks.keys()
+ try:
+ loop.add_signal_handler(signal.SIGINT, cancel, pending)
+ loop.add_signal_handler(signal.SIGTERM, cancel, pending)
+ except NotImplementedError:
+ # There are no good alternatives for these on Windows.
+ pass
+ while pending:
+ done, _ = await asyncio.wait(pending, return_when=asyncio.FIRST_COMPLETED)
+ for task in done:
+ src = tasks.pop(task)
+ if task.cancelled():
+ cancelled.append(task)
+ elif task.exception():
+ report.failed(src, str(task.exception()))
+ else:
+ changed = Changed.YES if task.result() else Changed.NO
+ # If the file was written back or was successfully checked as
+ # well-formatted, store this information in the cache.
+ if write_back is WriteBack.YES or (
+ write_back is WriteBack.CHECK and changed is Changed.NO
+ ):
+ sources_to_cache.append(src)
+ report.done(src, changed)
if cancelled:
await asyncio.gather(*cancelled, loop=loop, return_exceptions=True)
- if write_back == WriteBack.YES and formatted:
- write_cache(cache, formatted, line_length, mode)
+ if sources_to_cache:
+ write_cache(cache, sources_to_cache, mode)
def format_file_in_place(
src: Path,
- line_length: int,
fast: bool,
+ mode: FileMode,
write_back: WriteBack = WriteBack.NO,
- mode: FileMode = FileMode.AUTO_DETECT,
lock: Any = None, # multiprocessing.Manager().Lock() is some crazy proxy
) -> bool:
"""Format file under `src` path. Return True if changed.
- If `write_back` is True, write reformatted code back to stdout.
+ If `write_back` is DIFF, write a diff to stdout. If it is YES, write reformatted
+ code to the file.
`line_length` and `fast` options are passed to :func:`format_file_contents`.
"""
if src.suffix == ".pyi":
- mode |= FileMode.PYI
+ mode = evolve(mode, is_pyi=True)
then = datetime.utcfromtimestamp(src.stat().st_mtime)
with open(src, "rb") as buf:
src_contents, encoding, newline = decode_bytes(buf.read())
try:
- dst_contents = format_file_contents(
- src_contents, line_length=line_length, fast=fast, mode=mode
- )
+ dst_contents = format_file_contents(src_contents, fast=fast, mode=mode)
except NothingChanged:
return False
@@ -554,22 +636,19 @@ def format_file_in_place(
def format_stdin_to_stdout(
- line_length: int,
- fast: bool,
- write_back: WriteBack = WriteBack.NO,
- mode: FileMode = FileMode.AUTO_DETECT,
+ fast: bool, *, write_back: WriteBack = WriteBack.NO, mode: FileMode
) -> bool:
"""Format file on stdin. Return True if changed.
- If `write_back` is True, write reformatted code back to stdout.
- `line_length`, `fast`, `is_pyi`, and `force_py36` arguments are passed to
+ If `write_back` is YES, write reformatted code back to stdout. If it is DIFF,
+ write a diff to stdout. The `mode` argument is passed to
:func:`format_file_contents`.
"""
then = datetime.utcnow()
src, encoding, newline = decode_bytes(sys.stdin.buffer.read())
dst = src
try:
- dst = format_file_contents(src, line_length=line_length, fast=fast, mode=mode)
+ dst = format_file_contents(src, fast=fast, mode=mode)
return True
except NothingChanged:
@@ -590,11 +669,7 @@ def format_stdin_to_stdout(
def format_file_contents(
- src_contents: str,
- *,
- line_length: int,
- fast: bool,
- mode: FileMode = FileMode.AUTO_DETECT,
+ src_contents: str, *, fast: bool, mode: FileMode
) -> FileContent:
"""Reformat contents a file and return new contents.
@@ -605,44 +680,52 @@ def format_file_contents(
if src_contents.strip() == "":
raise NothingChanged
- dst_contents = format_str(src_contents, line_length=line_length, mode=mode)
+ dst_contents = format_str(src_contents, mode=mode)
if src_contents == dst_contents:
raise NothingChanged
if not fast:
assert_equivalent(src_contents, dst_contents)
- assert_stable(src_contents, dst_contents, line_length=line_length, mode=mode)
+ assert_stable(src_contents, dst_contents, mode=mode)
return dst_contents
-def format_str(
- src_contents: str, line_length: int, *, mode: FileMode = FileMode.AUTO_DETECT
-) -> FileContent:
+def format_str(src_contents: str, *, mode: FileMode) -> FileContent:
"""Reformat a string and return new contents.
`line_length` determines how many characters per line are allowed.
"""
- src_node = lib2to3_parse(src_contents)
+ src_node = lib2to3_parse(src_contents.lstrip(), mode.target_versions)
dst_contents = ""
future_imports = get_future_imports(src_node)
- is_pyi = bool(mode & FileMode.PYI)
- py36 = bool(mode & FileMode.PYTHON36) or is_python36(src_node)
- normalize_strings = not bool(mode & FileMode.NO_STRING_NORMALIZATION)
+ if mode.target_versions:
+ versions = mode.target_versions
+ else:
+ versions = detect_target_versions(src_node)
+ normalize_fmt_off(src_node)
lines = LineGenerator(
- remove_u_prefix=py36 or "unicode_literals" in future_imports,
- is_pyi=is_pyi,
- normalize_strings=normalize_strings,
+ remove_u_prefix="unicode_literals" in future_imports
+ or supports_feature(versions, Feature.UNICODE_LITERALS),
+ is_pyi=mode.is_pyi,
+ normalize_strings=mode.string_normalization,
)
- elt = EmptyLineTracker(is_pyi=is_pyi)
+ elt = EmptyLineTracker(is_pyi=mode.is_pyi)
empty_line = Line()
after = 0
+ split_line_features = {
+ feature
+ for feature in {Feature.TRAILING_COMMA_IN_CALL, Feature.TRAILING_COMMA_IN_DEF}
+ if supports_feature(versions, feature)
+ }
for current_line in lines.visit(src_node):
for _ in range(after):
dst_contents += str(empty_line)
before, after = elt.maybe_empty_lines(current_line)
for _ in range(before):
dst_contents += str(empty_line)
- for line in split_line(current_line, line_length=line_length, py36=py36):
+ for line in split_line(
+ current_line, line_length=mode.line_length, features=split_line_features
+ ):
dst_contents += str(line)
return dst_contents
@@ -664,19 +747,28 @@ def decode_bytes(src: bytes) -> Tuple[FileContent, Encoding, NewLine]:
return tiow.read(), encoding, newline
-GRAMMARS = [
- pygram.python_grammar_no_print_statement_no_exec_statement,
- pygram.python_grammar_no_print_statement,
- pygram.python_grammar,
-]
+def get_grammars(target_versions: Set[TargetVersion]) -> List[Grammar]:
+ if not target_versions:
+ # No target_version specified, so try all grammars.
+ return [
+ pygram.python_grammar_no_print_statement_no_exec_statement,
+ pygram.python_grammar_no_print_statement,
+ pygram.python_grammar,
+ ]
+ elif all(version.is_python2() for version in target_versions):
+ # Python 2-only code, so try Python 2 grammars.
+ return [pygram.python_grammar_no_print_statement, pygram.python_grammar]
+ else:
+ # Python 3-compatible code, so only try Python 3 grammar.
+ return [pygram.python_grammar_no_print_statement_no_exec_statement]
-def lib2to3_parse(src_txt: str) -> Node:
+def lib2to3_parse(src_txt: str, target_versions: Iterable[TargetVersion] = ()) -> Node:
"""Given a string with source, return the lib2to3 Node."""
- grammar = pygram.python_grammar_no_print_statement
if src_txt[-1:] != "\n":
src_txt += "\n"
- for grammar in GRAMMARS:
+
+ for grammar in get_grammars(set(target_versions)):
drv = driver.Driver(grammar, pytree.convert)
try:
result = drv.parse_string(src_txt, True)
@@ -689,7 +781,7 @@ def lib2to3_parse(src_txt: str) -> Node:
faulty_line = lines[lineno - 1]
except IndexError:
faulty_line = "<line number missing in source>"
- exc = ValueError(f"Cannot parse: {lineno}:{column}: {faulty_line}")
+ exc = InvalidInput(f"Cannot parse: {lineno}:{column}: {faulty_line}")
else:
raise exc from None
@@ -758,18 +850,18 @@ class DebugVisitor(Visitor[T]):
out(f" {node.value!r}", fg="blue", bold=False)
@classmethod
- def show(cls, code: str) -> None:
+ def show(cls, code: Union[str, Leaf, Node]) -> None:
"""Pretty-print the lib2to3 AST of a given string of `code`.
Convenience method for debugging.
"""
v: DebugVisitor[None] = DebugVisitor()
- list(v.visit(lib2to3_parse(code)))
+ if isinstance(code, str):
+ code = lib2to3_parse(code)
+ list(v.visit(code))
-KEYWORDS = set(keyword.kwlist)
WHITESPACE = {token.DEDENT, token.INDENT, token.NEWLINE}
-FLOW_CONTROL = {"return", "raise", "break", "continue"}
STATEMENT = {
syms.if_stmt,
syms.while_stmt,
@@ -781,6 +873,7 @@ STATEMENT = {
syms.classdef,
}
STANDALONE_COMMENT = 153
+token.tok_name[STANDALONE_COMMENT] = "STANDALONE_COMMENT"
LOGIC_OPERATORS = {"and", "or"}
COMPARATORS = {
token.LESS,
@@ -887,8 +980,8 @@ class BracketTracker:
bracket_match: Dict[Tuple[Depth, NodeType], Leaf] = Factory(dict)
delimiters: Dict[LeafID, Priority] = Factory(dict)
previous: Optional[Leaf] = None
- _for_loop_variable: int = 0
- _lambda_arguments: int = 0
+ _for_loop_depths: List[int] = Factory(list)
+ _lambda_argument_depths: List[int] = Factory(list)
def mark(self, leaf: Leaf) -> None:
"""Mark `leaf` with bracket-related metadata. Keep track of delimiters.
@@ -961,16 +1054,21 @@ class BracketTracker:
"""
if leaf.type == token.NAME and leaf.value == "for":
self.depth += 1
- self._for_loop_variable += 1
+ self._for_loop_depths.append(self.depth)
return True
return False
def maybe_decrement_after_for_loop_variable(self, leaf: Leaf) -> bool:
"""See `maybe_increment_for_loop_variable` above for explanation."""
- if self._for_loop_variable and leaf.type == token.NAME and leaf.value == "in":
+ if (
+ self._for_loop_depths
+ and self._for_loop_depths[-1] == self.depth
+ and leaf.type == token.NAME
+ and leaf.value == "in"
+ ):
self.depth -= 1
- self._for_loop_variable -= 1
+ self._for_loop_depths.pop()
return True
return False
@@ -983,16 +1081,20 @@ class BracketTracker:
"""
if leaf.type == token.NAME and leaf.value == "lambda":
self.depth += 1
- self._lambda_arguments += 1
+ self._lambda_argument_depths.append(self.depth)
return True
return False
def maybe_decrement_after_lambda_arguments(self, leaf: Leaf) -> bool:
"""See `maybe_increment_lambda_arguments` above for explanation."""
- if self._lambda_arguments and leaf.type == token.COLON:
+ if (
+ self._lambda_argument_depths
+ and self._lambda_argument_depths[-1] == self.depth
+ and leaf.type == token.COLON
+ ):
self.depth -= 1
- self._lambda_arguments -= 1
+ self._lambda_argument_depths.pop()
return True
return False
@@ -1008,7 +1110,7 @@ class Line:
depth: int = 0
leaves: List[Leaf] = Factory(list)
- comments: List[Tuple[Index, Leaf]] = Factory(list)
+ comments: Dict[LeafID, List[Leaf]] = Factory(dict) # keys ordered like `leaves`
bracket_tracker: BracketTracker = Factory(BracketTracker)
inside_brackets: bool = False
should_explode: bool = False
@@ -1139,6 +1241,29 @@ class Line:
if leaf.type == STANDALONE_COMMENT:
if leaf.bracket_depth <= depth_limit:
return True
+ return False
+
+ def contains_inner_type_comments(self) -> bool:
+ ignored_ids = set()
+ try:
+ last_leaf = self.leaves[-1]
+ ignored_ids.add(id(last_leaf))
+ if last_leaf.type == token.COMMA:
+ # When trailing commas are inserted by Black for consistency, comments
+ # after the previous last element are not moved (they don't have to,
+ # rendering will still be correct). So we ignore trailing commas.
+ last_leaf = self.leaves[-2]
+ ignored_ids.add(id(last_leaf))
+ except IndexError:
+ return False
+
+ for leaf_id, comments in self.comments.items():
+ if leaf_id in ignored_ids:
+ continue
+
+ for comment in comments:
+ if is_type_comment(comment):
+ return True
return False
@@ -1174,7 +1299,7 @@ class Line:
self.remove_trailing_comma()
return True
- # Otheriwsse, if the trailing one is the only one, we might mistakenly
+ # Otherwise, if the trailing one is the only one, we might mistakenly
# change a tuple into a different type by removing the comma.
depth = closing.bracket_depth + 1
commas = 0
@@ -1215,44 +1340,25 @@ class Line:
if comment.type != token.COMMENT:
return False
- after = len(self.leaves) - 1
- if after == -1:
+ if not self.leaves:
comment.type = STANDALONE_COMMENT
comment.prefix = ""
return False
- else:
- self.comments.append((after, comment))
- return True
-
- def comments_after(self, leaf: Leaf, _index: int = -1) -> Iterator[Leaf]:
- """Generate comments that should appear directly after `leaf`.
-
- Provide a non-negative leaf `_index` to speed up the function.
- """
- if not self.comments:
- return
-
- if _index == -1:
- for _index, _leaf in enumerate(self.leaves):
- if leaf is _leaf:
- break
-
- else:
- return
+ self.comments.setdefault(id(self.leaves[-1]), []).append(comment)
+ return True
- for index, comment_after in self.comments:
- if _index == index:
- yield comment_after
+ def comments_after(self, leaf: Leaf) -> List[Leaf]:
+ """Generate comments that should appear directly after `leaf`."""
+ return self.comments.get(id(leaf), [])
def remove_trailing_comma(self) -> None:
"""Remove the trailing comma and moves the comments attached to it."""
- comma_index = len(self.leaves) - 1
- for i in range(len(self.comments)):
- comment_index, comment = self.comments[i]
- if comment_index == comma_index:
- self.comments[i] = (comma_index - 1, comment)
- self.leaves.pop()
+ trailing_comma = self.leaves.pop()
+ trailing_comma_comments = self.comments.pop(id(trailing_comma), [])
+ self.comments.setdefault(id(self.leaves[-1]), []).extend(
+ trailing_comma_comments
+ )
def is_complex_subscript(self, leaf: Leaf) -> bool:
"""Return True iff `leaf` is part of a slice with non-trivial exprs."""
@@ -1283,7 +1389,7 @@ class Line:
res = f"{first.prefix}{indent}{first.value}"
for leaf in leaves:
res += str(leaf)
- for _, comment in self.comments:
+ for comment in itertools.chain.from_iterable(self.comments.values()):
res += str(comment)
return res + "\n"
@@ -1292,55 +1398,6 @@ class Line:
return bool(self.leaves or self.comments)
-class UnformattedLines(Line):
- """Just like :class:`Line` but stores lines which aren't reformatted."""
-
- def append(self, leaf: Leaf, preformatted: bool = True) -> None:
- """Just add a new `leaf` to the end of the lines.
-
- The `preformatted` argument is ignored.
-
- Keeps track of indentation `depth`, which is useful when the user
- says `# fmt: on`. Otherwise, doesn't do anything with the `leaf`.
- """
- try:
- list(generate_comments(leaf))
- except FormatOn as f_on:
- self.leaves.append(f_on.leaf_from_consumed(leaf))
- raise
-
- self.leaves.append(leaf)
- if leaf.type == token.INDENT:
- self.depth += 1
- elif leaf.type == token.DEDENT:
- self.depth -= 1
-
- def __str__(self) -> str:
- """Render unformatted lines from leaves which were added with `append()`.
-
- `depth` is not used for indentation in this case.
- """
- if not self:
- return "\n"
-
- res = ""
- for leaf in self.leaves:
- res += str(leaf)
- return res
-
- def append_comment(self, comment: Leaf) -> bool:
- """Not implemented in this class. Raises `NotImplementedError`."""
- raise NotImplementedError("Unformatted lines don't store comments separately.")
-
- def maybe_remove_trailing_comma(self, closing: Leaf) -> bool:
- """Does nothing and returns False."""
- return False
-
- def maybe_increment_for_loop_variable(self, leaf: Leaf) -> bool:
- """Does nothing and returns False."""
- return False
-
-
@dataclass
class EmptyLineTracker:
"""Provides a stateful method that returns the number of potential extra
@@ -1362,9 +1419,6 @@ class EmptyLineTracker:
This is for separating `def`, `async def` and `class` with extra empty
lines (two on module-level).
"""
- if isinstance(current_line, UnformattedLines):
- return 0, 0
-
before, after = self._maybe_empty_lines(current_line)
before -= self.previous_after
self.previous_after = after
@@ -1439,7 +1493,7 @@ class EmptyLineTracker:
newlines = 1
elif current_line.is_class or self.previous_line.is_class:
if current_line.is_stub_class and self.previous_line.is_stub_class:
- # No blank line between classes with an emty body
+ # No blank line between classes with an empty body
newlines = 0
else:
newlines = 1
@@ -1468,7 +1522,7 @@ class LineGenerator(Visitor[Line]):
current_line: Line = Factory(Line)
remove_u_prefix: bool = False
- def line(self, indent: int = 0, type: Type[Line] = Line) -> Iterator[Line]:
+ def line(self, indent: int = 0) -> Iterator[Line]:
"""Generate a line.
If the line is empty, only emit if it makes sense.
@@ -1477,67 +1531,41 @@ class LineGenerator(Visitor[Line]):
If any lines were generated, set up a new current_line.
"""
if not self.current_line:
- if self.current_line.__class__ == type:
- self.current_line.depth += indent
- else:
- self.current_line = type(depth=self.current_line.depth + indent)
+ self.current_line.depth += indent
return # Line is empty, don't emit. Creating a new one unnecessary.
complete_line = self.current_line
- self.current_line = type(depth=complete_line.depth + indent)
+ self.current_line = Line(depth=complete_line.depth + indent)
yield complete_line
- def visit(self, node: LN) -> Iterator[Line]:
- """Main method to visit `node` and its children.
-
- Yields :class:`Line` objects.
- """
- if isinstance(self.current_line, UnformattedLines):
- # File contained `# fmt: off`
- yield from self.visit_unformatted(node)
-
- else:
- yield from super().visit(node)
-
def visit_default(self, node: LN) -> Iterator[Line]:
"""Default `visit_*()` implementation. Recurses to children of `node`."""
if isinstance(node, Leaf):
any_open_brackets = self.current_line.bracket_tracker.any_open_brackets()
- try:
- for comment in generate_comments(node):
- if any_open_brackets:
- # any comment within brackets is subject to splitting
- self.current_line.append(comment)
- elif comment.type == token.COMMENT:
- # regular trailing comment
- self.current_line.append(comment)
- yield from self.line()
-
- else:
- # regular standalone comment
- yield from self.line()
-
- self.current_line.append(comment)
- yield from self.line()
-
- except FormatOff as f_off:
- f_off.trim_prefix(node)
- yield from self.line(type=UnformattedLines)
- yield from self.visit(node)
+ for comment in generate_comments(node):
+ if any_open_brackets:
+ # any comment within brackets is subject to splitting
+ self.current_line.append(comment)
+ elif comment.type == token.COMMENT:
+ # regular trailing comment
+ self.current_line.append(comment)
+ yield from self.line()
- except FormatOn as f_on:
- # This only happens here if somebody says "fmt: on" multiple
- # times in a row.
- f_on.trim_prefix(node)
- yield from self.visit_default(node)
-
- else:
- normalize_prefix(node, inside_brackets=any_open_brackets)
- if self.normalize_strings and node.type == token.STRING:
- normalize_string_prefix(node, remove_u_prefix=self.remove_u_prefix)
- normalize_string_quotes(node)
- if node.type not in WHITESPACE:
- self.current_line.append(node)
+ else:
+ # regular standalone comment
+ yield from self.line()
+
+ self.current_line.append(comment)
+ yield from self.line()
+
+ normalize_prefix(node, inside_brackets=any_open_brackets)
+ if self.normalize_strings and node.type == token.STRING:
+ normalize_string_prefix(node, remove_u_prefix=self.remove_u_prefix)
+ normalize_string_quotes(node)
+ if node.type == token.NUMBER:
+ normalize_numeric_literal(node)
+ if node.type not in WHITESPACE:
+ self.current_line.append(node)
yield from super().visit_default(node)
def visit_INDENT(self, node: Node) -> Iterator[Line]:
@@ -1634,23 +1662,10 @@ class LineGenerator(Visitor[Line]):
yield from self.visit_default(leaf)
yield from self.line()
- def visit_unformatted(self, node: LN) -> Iterator[Line]:
- """Used when file contained a `# fmt: off`."""
- if isinstance(node, Node):
- for child in node.children:
- yield from self.visit(child)
-
- else:
- try:
- self.current_line.append(node)
- except FormatOn as f_on:
- f_on.trim_prefix(node)
- yield from self.line()
- yield from self.visit(node)
-
- if node.type == token.ENDMARKER:
- # somebody decided not to put a final `# fmt: on`
- yield from self.line()
+ def visit_STANDALONE_COMMENT(self, leaf: Leaf) -> Iterator[Line]:
+ if not self.current_line.bracket_tracker.any_open_brackets():
+ yield from self.line()
+ yield from self.visit_default(leaf)
def __attrs_post_init__(self) -> None:
"""You are in a twisty little maze of passages."""
@@ -1672,6 +1687,7 @@ class LineGenerator(Visitor[Line]):
self.visit_expr_stmt = partial(v, keywords=Ã, parens=ASSIGNMENTS)
self.visit_return_stmt = partial(v, keywords={"return"}, parens={"return"})
self.visit_import_from = partial(v, keywords=Ã, parens={"import"})
+ self.visit_del_stmt = partial(v, keywords=Ã, parens={"del"})
self.visit_async_funcdef = self.visit_async_stmt
self.visit_decorated = self.visit_decorators
@@ -1684,7 +1700,7 @@ BRACKETS = OPENING_BRACKETS | CLOSING_BRACKETS
ALWAYS_NO_SPACE = CLOSING_BRACKETS | {token.COMMA, STANDALONE_COMMENT}
-def whitespace(leaf: Leaf, *, complex_subscript: bool) -> str: # noqa C901
+def whitespace(leaf: Leaf, *, complex_subscript: bool) -> str: # noqa: C901
"""Return whitespace prefix if needed for the given `leaf`.
`complex_subscript` signals whether the given leaf is part of a subscription
@@ -1940,7 +1956,32 @@ def child_towards(ancestor: Node, descendant: LN) -> Optional[LN]:
return node
-def is_split_after_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
+def container_of(leaf: Leaf) -> LN:
+ """Return `leaf` or one of its ancestors that is the topmost container of it.
+
+ By "container" we mean a node where `leaf` is the very first child.
+ """
+ same_prefix = leaf.prefix
+ container: LN = leaf
+ while container:
+ parent = container.parent
+ if parent is None:
+ break
+
+ if parent.children[0].prefix != same_prefix:
+ break
+
+ if parent.type == syms.file_input:
+ break
+
+ if parent.prev_sibling is not None and parent.prev_sibling.type in BRACKETS:
+ break
+
+ container = parent
+ return container
+
+
+def is_split_after_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> int:
"""Return the priority of the `leaf` delimiter, given a line break after it.
The delimiter priorities returned here are from those delimiters that would
@@ -1954,8 +1995,8 @@ def is_split_after_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
return 0
-def is_split_before_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
- """Return the priority of the `leaf` delimiter, given a line before after it.
+def is_split_before_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> int:
+ """Return the priority of the `leaf` delimiter, given a line break before it.
The delimiter priorities returned here are from those delimiters that would
cause a line break before themselves.
@@ -1992,15 +2033,20 @@ def is_split_before_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
):
return STRING_PRIORITY
- if leaf.type != token.NAME:
+ if leaf.type not in {token.NAME, token.ASYNC}:
return 0
if (
leaf.value == "for"
and leaf.parent
and leaf.parent.type in {syms.comp_for, syms.old_comp_for}
+ or leaf.type == token.ASYNC
):
- return COMPREHENSION_PRIORITY
+ if (
+ not isinstance(leaf.prev_sibling, Leaf)
+ or leaf.prev_sibling.value != "async"
+ ):
+ return COMPREHENSION_PRIORITY
if (
leaf.value == "if"
@@ -2070,20 +2116,20 @@ def generate_comments(leaf: LN) -> Iterator[Leaf]:
"""
for pc in list_comments(leaf.prefix, is_endmarker=leaf.type == token.ENDMARKER):
yield Leaf(pc.type, pc.value, prefix="\n" * pc.newlines)
- if pc.value in FMT_ON:
- raise FormatOn(pc.consumed)
-
- if pc.value in FMT_OFF:
- if pc.type == STANDALONE_COMMENT:
- raise FormatOff(pc.consumed)
-
- prev = preceding_leaf(leaf)
- if not prev or prev.type in WHITESPACE: # standalone comment in disguise
- raise FormatOff(pc.consumed)
@dataclass
class ProtoComment:
+ """Describes a piece of syntax that is a comment.
+
+ It's not a :class:`blib2to3.pytree.Leaf` so that:
+
+ * it can be cached (`Leaf` objects should not be reused more than once as
+ they store their lineno, column, prefix, and parent information);
+ * `newlines` and `consumed` fields are kept separate from the `value`. This
+ simplifies handling of special marker comments like ``# fmt: off/on``.
+ """
+
type: int # token.COMMENT or STANDALONE_COMMENT
value: str # content of the comment
newlines: int # how many newlines before the comment
@@ -2091,7 +2137,8 @@ class ProtoComment:
@lru_cache(maxsize=4096)
-def list_comments(prefix: str, is_endmarker: bool) -> List[ProtoComment]:
+def list_comments(prefix: str, *, is_endmarker: bool) -> List[ProtoComment]:
+ """Return a list of :class:`ProtoComment` objects parsed from the given `prefix`."""
result: List[ProtoComment] = []
if not prefix or "#" not in prefix:
return result
@@ -2123,8 +2170,8 @@ def list_comments(prefix: str, is_endmarker: bool) -> List[ProtoComment]:
def make_comment(content: str) -> str:
"""Return a consistently formatted comment from the given `content` string.
- All comments (except for "##", "#!", "#:") should have a single space between
- the hash sign and the content.
+ All comments (except for "##", "#!", "#:", '#'", "#%%") should have a single
+ space between the hash sign and the content.
If `content` didn't start with a hash sign, one is provided.
"""
@@ -2134,13 +2181,16 @@ def make_comment(content: str) -> str:
if content[0] == "#":
content = content[1:]
- if content and content[0] not in " !:#":
+ if content and content[0] not in " !:#'%":
content = " " + content
return "#" + content
def split_line(
- line: Line, line_length: int, inner: bool = False, py36: bool = False
+ line: Line,
+ line_length: int,
+ inner: bool = False,
+ features: Collection[Feature] = (),
) -> Iterator[Line]:
"""Split a `line` into potentially many lines.
@@ -2149,16 +2199,18 @@ def split_line(
current `line`, possibly transitively. This means we can fallback to splitting
by delimiters if the LHS/RHS don't yield any results.
- If `py36` is True, splitting may generate syntax that is only compatible
- with Python 3.6 and later.
+ `features` are syntactical features that may be used in the output.
"""
- if isinstance(line, UnformattedLines) or line.is_comment:
+ if line.is_comment:
yield line
return
line_str = str(line).strip("\n")
- if not line.should_explode and is_line_short_enough(
- line, line_length=line_length, line_str=line_str
+
+ if (
+ not line.contains_inner_type_comments()
+ and not line.should_explode
+ and is_line_short_enough(line, line_length=line_length, line_str=line_str)
):
yield line
return
@@ -2168,9 +2220,9 @@ def split_line(
split_funcs = [left_hand_split]
else:
- def rhs(line: Line, py36: bool = False) -> Iterator[Line]:
+ def rhs(line: Line, features: Collection[Feature]) -> Iterator[Line]:
for omit in generate_trailers_to_omit(line, line_length):
- lines = list(right_hand_split(line, line_length, py36, omit=omit))
+ lines = list(right_hand_split(line, line_length, features, omit=omit))
if is_line_short_enough(lines[0], line_length=line_length):
yield from lines
return
@@ -2178,7 +2230,7 @@ def split_line(
# All splits failed, best effort split with no omits.
# This mostly happens to multiline strings that are by definition
# reported as not fitting a single line.
- yield from right_hand_split(line, py36)
+ yield from right_hand_split(line, line_length, features=features)
if line.inside_brackets:
split_funcs = [delimiter_split, standalone_comment_split, rhs]
@@ -2190,14 +2242,16 @@ def split_line(
# split altogether.
result: List[Line] = []
try:
- for l in split_func(line, py36):
+ for l in split_func(line, features):
if str(l).strip("\n") == line_str:
raise CannotSplit("Split function returned an unchanged result")
result.extend(
- split_line(l, line_length=line_length, inner=True, py36=py36)
+ split_line(
+ l, line_length=line_length, inner=True, features=features
+ )
)
- except CannotSplit as cs:
+ except CannotSplit:
continue
else:
@@ -2208,16 +2262,13 @@ def split_line(
yield line
-def left_hand_split(line: Line, py36: bool = False) -> Iterator[Line]:
+def left_hand_split(line: Line, features: Collection[Feature] = ()) -> Iterator[Line]:
"""Split line into many lines, starting with the first matching bracket pair.
Note: this usually looks weird, only use this for function definitions.
Prefer RHS otherwise. This is why this function is not symmetrical with
:func:`right_hand_split` which also handles optional parentheses.
"""
- head = Line(depth=line.depth)
- body = Line(depth=line.depth + 1, inside_brackets=True)
- tail = Line(depth=line.depth)
tail_leaves: List[Leaf] = []
body_leaves: List[Leaf] = []
head_leaves: List[Leaf] = []
@@ -2235,15 +2286,12 @@ def left_hand_split(line: Line, py36: bool = False) -> Iterator[Line]:
if leaf.type in OPENING_BRACKETS:
matching_bracket = leaf
current_leaves = body_leaves
- # Since body is a new indent level, remove spurious leading whitespace.
- if body_leaves:
- normalize_prefix(body_leaves[0], inside_brackets=True)
- # Build the new lines.
- for result, leaves in (head, head_leaves), (body, body_leaves), (tail, tail_leaves):
- for leaf in leaves:
- result.append(leaf, preformatted=True)
- for comment_after in line.comments_after(leaf):
- result.append(comment_after, preformatted=True)
+ if not matching_bracket:
+ raise CannotSplit("No brackets found")
+
+ head = bracket_split_build_line(head_leaves, line, matching_bracket)
+ body = bracket_split_build_line(body_leaves, line, matching_bracket, is_body=True)
+ tail = bracket_split_build_line(tail_leaves, line, matching_bracket)
bracket_split_succeeded_or_raise(head, body, tail)
for result in (head, body, tail):
if result:
@@ -2251,7 +2299,10 @@ def left_hand_split(line: Line, py36: bool = False) -> Iterator[Line]:
def right_hand_split(
- line: Line, line_length: int, py36: bool = False, omit: Collection[LeafID] = ()
+ line: Line,
+ line_length: int,
+ features: Collection[Feature] = (),
+ omit: Collection[LeafID] = (),
) -> Iterator[Line]:
"""Split line into many lines, starting with the last matching bracket pair.
@@ -2261,9 +2312,6 @@ def right_hand_split(
Note: running this function modifies `bracket_depth` on the leaves of `line`.
"""
- head = Line(depth=line.depth)
- body = Line(depth=line.depth + 1, inside_brackets=True)
- tail = Line(depth=line.depth)
tail_leaves: List[Leaf] = []
body_leaves: List[Leaf] = []
head_leaves: List[Leaf] = []
@@ -2280,25 +2328,18 @@ def right_hand_split(
opening_bracket = leaf.opening_bracket
closing_bracket = leaf
current_leaves = body_leaves
- tail_leaves.reverse()
- body_leaves.reverse()
- head_leaves.reverse()
- # Since body is a new indent level, remove spurious leading whitespace.
- if body_leaves:
- normalize_prefix(body_leaves[0], inside_brackets=True)
- if not head_leaves:
- # No `head` means the split failed. Either `tail` has all content or
+ if not (opening_bracket and closing_bracket and head_leaves):
+ # If there is no opening or closing_bracket that means the split failed and
+ # all content is in the tail. Otherwise, if `head_leaves` are empty, it means
# the matching `opening_bracket` wasn't available on `line` anymore.
raise CannotSplit("No brackets found")
- # Build the new lines.
- for result, leaves in (head, head_leaves), (body, body_leaves), (tail, tail_leaves):
- for leaf in leaves:
- result.append(leaf, preformatted=True)
- for comment_after in line.comments_after(leaf):
- result.append(comment_after, preformatted=True)
- assert opening_bracket and closing_bracket
- body.should_explode = should_explode(body, opening_bracket)
+ tail_leaves.reverse()
+ body_leaves.reverse()
+ head_leaves.reverse()
+ head = bracket_split_build_line(head_leaves, line, opening_bracket)
+ body = bracket_split_build_line(body_leaves, line, opening_bracket, is_body=True)
+ tail = bracket_split_build_line(tail_leaves, line, opening_bracket)
bracket_split_succeeded_or_raise(head, body, tail)
if (
# the body shouldn't be exploded
@@ -2319,7 +2360,7 @@ def right_hand_split(
):
omit = {id(closing_bracket), *omit}
try:
- yield from right_hand_split(line, line_length, py36=py36, omit=omit)
+ yield from right_hand_split(line, line_length, features=features, omit=omit)
return
except CannotSplit:
@@ -2372,6 +2413,42 @@ def bracket_split_succeeded_or_raise(head: Line, body: Line, tail: Line) -> None
)
+def bracket_split_build_line(
+ leaves: List[Leaf], original: Line, opening_bracket: Leaf, *, is_body: bool = False
+) -> Line:
+ """Return a new line with given `leaves` and respective comments from `original`.
+
+ If `is_body` is True, the result line is one-indented inside brackets and as such
+ has its first leaf's prefix normalized and a trailing comma added when expected.
+ """
+ result = Line(depth=original.depth)
+ if is_body:
+ result.inside_brackets = True
+ result.depth += 1
+ if leaves:
+ # Since body is a new indent level, remove spurious leading whitespace.
+ normalize_prefix(leaves[0], inside_brackets=True)
+ # Ensure a trailing comma for imports, but be careful not to add one after
+ # any comments.
+ if original.is_import:
+ for i in range(len(leaves) - 1, -1, -1):
+ if leaves[i].type == STANDALONE_COMMENT:
+ continue
+ elif leaves[i].type == token.COMMA:
+ break
+ else:
+ leaves.insert(i + 1, Leaf(token.COMMA, ","))
+ break
+ # Populate the line
+ for leaf in leaves:
+ result.append(leaf, preformatted=True)
+ for comment_after in original.comments_after(leaf):
+ result.append(comment_after, preformatted=True)
+ if is_body:
+ result.should_explode = should_explode(result, opening_bracket)
+ return result
+
+
def dont_increase_indentation(split_func: SplitFunc) -> SplitFunc:
"""Normalize prefix of the first leaf in every line returned by `split_func`.
@@ -2379,8 +2456,8 @@ def dont_increase_indentation(split_func: SplitFunc) -> SplitFunc:
"""
@wraps(split_func)
- def split_wrapper(line: Line, py36: bool = False) -> Iterator[Line]:
- for l in split_func(line, py36):
+ def split_wrapper(line: Line, features: Collection[Feature] = ()) -> Iterator[Line]:
+ for l in split_func(line, features):
normalize_prefix(l.leaves[0], inside_brackets=True)
yield l
@@ -2388,11 +2465,11 @@ def dont_increase_indentation(split_func: SplitFunc) -> SplitFunc:
@dont_increase_indentation
-def delimiter_split(line: Line, py36: bool = False) -> Iterator[Line]:
+def delimiter_split(line: Line, features: Collection[Feature] = ()) -> Iterator[Line]:
"""Split according to delimiters of the highest priority.
- If `py36` is True, the split will add trailing commas also in function
- signatures that contain `*` and `**`.
+ If the appropriate Features are given, the split will add trailing commas
+ also in function signatures and calls that contain `*` and `**`.
"""
try:
last_leaf = line.leaves[-1]
@@ -2418,23 +2495,29 @@ def delimiter_split(line: Line, py36: bool = False) -> Iterator[Line]:
nonlocal current_line
try:
current_line.append_safe(leaf, preformatted=True)
- except ValueError as ve:
+ except ValueError:
yield current_line
current_line = Line(depth=line.depth, inside_brackets=line.inside_brackets)
current_line.append(leaf)
- for index, leaf in enumerate(line.leaves):
+ for leaf in line.leaves:
yield from append_to_line(leaf)
- for comment_after in line.comments_after(leaf, index):
+ for comment_after in line.comments_after(leaf):
yield from append_to_line(comment_after)
lowest_depth = min(lowest_depth, leaf.bracket_depth)
- if leaf.bracket_depth == lowest_depth and is_vararg(
- leaf, within=VARARGS_PARENTS
- ):
- trailing_comma_safe = trailing_comma_safe and py36
+ if leaf.bracket_depth == lowest_depth:
+ if is_vararg(leaf, within={syms.typedargslist}):
+ trailing_comma_safe = (
+ trailing_comma_safe and Feature.TRAILING_COMMA_IN_DEF in features
+ )
+ elif is_vararg(leaf, within={syms.arglist, syms.argument}):
+ trailing_comma_safe = (
+ trailing_comma_safe and Feature.TRAILING_COMMA_IN_CALL in features
+ )
+
leaf_priority = bt.delimiters.get(id(leaf))
if leaf_priority == delimiter_priority:
yield current_line
@@ -2452,7 +2535,9 @@ def delimiter_split(line: Line, py36: bool = False) -> Iterator[Line]:
@dont_increase_indentation
-def standalone_comment_split(line: Line, py36: bool = False) -> Iterator[Line]:
+def standalone_comment_split(
+ line: Line, features: Collection[Feature] = ()
+) -> Iterator[Line]:
"""Split standalone comments from the rest of the line."""
if not line.contains_standalone_comments(0):
raise CannotSplit("Line does not have any standalone comments")
@@ -2464,16 +2549,16 @@ def standalone_comment_split(line: Line, py36: bool = False) -> Iterator[Line]:
nonlocal current_line
try:
current_line.append_safe(leaf, preformatted=True)
- except ValueError as ve:
+ except ValueError:
yield current_line
current_line = Line(depth=line.depth, inside_brackets=line.inside_brackets)
current_line.append(leaf)
- for index, leaf in enumerate(line.leaves):
+ for leaf in line.leaves:
yield from append_to_line(leaf)
- for comment_after in line.comments_after(leaf, index):
+ for comment_after in line.comments_after(leaf):
yield from append_to_line(comment_after)
if current_line:
@@ -2494,6 +2579,14 @@ def is_import(leaf: Leaf) -> bool:
)
+def is_type_comment(leaf: Leaf) -> bool:
+ """Return True if the given leaf is a special comment.
+ Only returns true for type comments for now."""
+ t = leaf.type
+ v = leaf.value
+ return t in {token.COMMENT, t == STANDALONE_COMMENT} and v.startswith("# type:")
+
+
def normalize_prefix(leaf: Leaf, *, inside_brackets: bool) -> None:
"""Leave existing extra newlines if not `inside_brackets`. Remove everything
else.
@@ -2595,6 +2688,51 @@ def normalize_string_quotes(leaf: Leaf) -> None:
leaf.value = f"{prefix}{new_quote}{new_body}{new_quote}"
+def normalize_numeric_literal(leaf: Leaf) -> None:
+ """Normalizes numeric (float, int, and complex) literals.
+
+ All letters used in the representation are normalized to lowercase (except
+ in Python 2 long literals).
+ """
+ text = leaf.value.lower()
+ if text.startswith(("0o", "0b")):
+ # Leave octal and binary literals alone.
+ pass
+ elif text.startswith("0x"):
+ # Change hex literals to upper case.
+ before, after = text[:2], text[2:]
+ text = f"{before}{after.upper()}"
+ elif "e" in text:
+ before, after = text.split("e")
+ sign = ""
+ if after.startswith("-"):
+ after = after[1:]
+ sign = "-"
+ elif after.startswith("+"):
+ after = after[1:]
+ before = format_float_or_int_string(before)
+ text = f"{before}e{sign}{after}"
+ elif text.endswith(("j", "l")):
+ number = text[:-1]
+ suffix = text[-1]
+ # Capitalize in "2L" because "l" looks too similar to "1".
+ if suffix == "l":
+ suffix = "L"
+ text = f"{format_float_or_int_string(number)}{suffix}"
+ else:
+ text = format_float_or_int_string(text)
+ leaf.value = text
+
+
+def format_float_or_int_string(text: str) -> str:
+ """Formats a float string like "1.0"."""
+ if "." not in text:
+ return text
+
+ before, after = text.split(".")
+ return f"{before or 0}.{after or 0}"
+
+
def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
"""Make existing optional parentheses invisible or create new ones.
@@ -2611,9 +2749,21 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
check_lpar = False
for index, child in enumerate(list(node.children)):
+ # Add parentheses around long tuple unpacking in assignments.
+ if (
+ index == 0
+ and isinstance(child, Node)
+ and child.type == syms.testlist_star_expr
+ ):
+ check_lpar = True
+
if check_lpar:
if child.type == syms.atom:
- maybe_make_parens_invisible_in_atom(child)
+ if maybe_make_parens_invisible_in_atom(child, parent=node):
+ lpar = Leaf(token.LPAR, "")
+ rpar = Leaf(token.RPAR, "")
+ index = child.remove() or 0
+ node.insert_child(index, Node(syms.atom, [lpar, child, rpar]))
elif is_one_tuple(child):
# wrap child in visible parentheses
lpar = Leaf(token.LPAR, "(")
@@ -2638,18 +2788,103 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
lpar = Leaf(token.LPAR, "")
rpar = Leaf(token.RPAR, "")
index = child.remove() or 0
- node.insert_child(index, Node(syms.atom, [lpar, child, rpar]))
+ prefix = child.prefix
+ child.prefix = ""
+ new_child = Node(syms.atom, [lpar, child, rpar])
+ new_child.prefix = prefix
+ node.insert_child(index, new_child)
check_lpar = isinstance(child, Leaf) and child.value in parens_after
-def maybe_make_parens_invisible_in_atom(node: LN) -> bool:
- """If it's safe, make the parens in the atom `node` invisible, recursively."""
+def normalize_fmt_off(node: Node) -> None:
+ """Convert content between `# fmt: off`/`# fmt: on` into standalone comments."""
+ try_again = True
+ while try_again:
+ try_again = convert_one_fmt_off_pair(node)
+
+
+def convert_one_fmt_off_pair(node: Node) -> bool:
+ """Convert content of a single `# fmt: off`/`# fmt: on` into a standalone comment.
+
+ Returns True if a pair was converted.
+ """
+ for leaf in node.leaves():
+ previous_consumed = 0
+ for comment in list_comments(leaf.prefix, is_endmarker=False):
+ if comment.value in FMT_OFF:
+ # We only want standalone comments. If there's no previous leaf or
+ # the previous leaf is indentation, it's a standalone comment in
+ # disguise.
+ if comment.type != STANDALONE_COMMENT:
+ prev = preceding_leaf(leaf)
+ if prev and prev.type not in WHITESPACE:
+ continue
+
+ ignored_nodes = list(generate_ignored_nodes(leaf))
+ if not ignored_nodes:
+ continue
+
+ first = ignored_nodes[0] # Can be a container node with the `leaf`.
+ parent = first.parent
+ prefix = first.prefix
+ first.prefix = prefix[comment.consumed :]
+ hidden_value = (
+ comment.value + "\n" + "".join(str(n) for n in ignored_nodes)
+ )
+ if hidden_value.endswith("\n"):
+ # That happens when one of the `ignored_nodes` ended with a NEWLINE
+ # leaf (possibly followed by a DEDENT).
+ hidden_value = hidden_value[:-1]
+ first_idx = None
+ for ignored in ignored_nodes:
+ index = ignored.remove()
+ if first_idx is None:
+ first_idx = index
+ assert parent is not None, "INTERNAL ERROR: fmt: on/off handling (1)"
+ assert first_idx is not None, "INTERNAL ERROR: fmt: on/off handling (2)"
+ parent.insert_child(
+ first_idx,
+ Leaf(
+ STANDALONE_COMMENT,
+ hidden_value,
+ prefix=prefix[:previous_consumed] + "\n" * comment.newlines,
+ ),
+ )
+ return True
+
+ previous_consumed = comment.consumed
+
+ return False
+
+
+def generate_ignored_nodes(leaf: Leaf) -> Iterator[LN]:
+ """Starting from the container of `leaf`, generate all leaves until `# fmt: on`.
+
+ Stops at the end of the block.
+ """
+ container: Optional[LN] = container_of(leaf)
+ while container is not None and container.type != token.ENDMARKER:
+ for comment in list_comments(container.prefix, is_endmarker=False):
+ if comment.value in FMT_ON:
+ return
+
+ yield container
+
+ container = container.next_sibling
+
+
+def maybe_make_parens_invisible_in_atom(node: LN, parent: LN) -> bool:
+ """If it's safe, make the parens in the atom `node` invisible, recursively.
+
+ Returns whether the node should itself be wrapped in invisible parentheses.
+
+ """
if (
node.type != syms.atom
or is_empty_tuple(node)
or is_one_tuple(node)
- or is_yield(node)
+ or (is_yield(node) and parent.type != syms.expr_stmt)
or max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY
):
return False
@@ -2661,10 +2896,10 @@ def maybe_make_parens_invisible_in_atom(node: LN) -> bool:
first.value = "" # type: ignore
last.value = "" # type: ignore
if len(node.children) > 1:
- maybe_make_parens_invisible_in_atom(node.children[1])
- return True
+ maybe_make_parens_invisible_in_atom(node.children[1], parent=parent)
+ return False
- return False
+ return True
def is_empty_tuple(node: LN) -> bool:
@@ -2821,6 +3056,7 @@ def ensure_visible(leaf: Leaf) -> None:
def should_explode(line: Line, opening_bracket: Leaf) -> bool:
"""Should `line` immediately be split with `delimiter_split()` after RHS?"""
+
if not (
opening_bracket.parent
and opening_bracket.parent.type in {syms.atom, syms.import_from}
@@ -2838,34 +3074,53 @@ def should_explode(line: Line, opening_bracket: Leaf) -> bool:
return max_priority == COMMA_PRIORITY
-def is_python36(node: Node) -> bool:
- """Return True if the current file is using Python 3.6+ features.
+def get_features_used(node: Node) -> Set[Feature]:
+ """Return a set of (relatively) new Python features used in this file.
Currently looking for:
- - f-strings; and
+ - f-strings;
+ - underscores in numeric literals; and
- trailing commas after * or ** in function signatures and calls.
"""
+ features: Set[Feature] = set()
for n in node.pre_order():
if n.type == token.STRING:
value_head = n.value[:2] # type: ignore
if value_head in {'f"', 'F"', "f'", "F'", "rf", "fr", "RF", "FR"}:
- return True
+ features.add(Feature.F_STRINGS)
+
+ elif n.type == token.NUMBER:
+ if "_" in n.value: # type: ignore
+ features.add(Feature.NUMERIC_UNDERSCORES)
elif (
n.type in {syms.typedargslist, syms.arglist}
and n.children
and n.children[-1].type == token.COMMA
):
+ if n.type == syms.typedargslist:
+ feature = Feature.TRAILING_COMMA_IN_DEF
+ else:
+ feature = Feature.TRAILING_COMMA_IN_CALL
+
for ch in n.children:
if ch.type in STARS:
- return True
+ features.add(feature)
if ch.type == syms.argument:
for argch in ch.children:
if argch.type in STARS:
- return True
+ features.add(feature)
- return False
+ return features
+
+
+def detect_target_versions(node: Node) -> Set[TargetVersion]:
+ """Detect the version to target based on the nodes used."""
+ features = get_features_used(node)
+ return {
+ version for version in TargetVersion if features <= VERSION_TO_FEATURES[version]
+ }
def generate_trailers_to_omit(line: Line, line_length: int) -> Iterator[Set[LeafID]]:
@@ -2884,7 +3139,6 @@ def generate_trailers_to_omit(line: Line, line_length: int) -> Iterator[Set[Leaf
length = 4 * line.depth
opening_bracket = None
closing_bracket = None
- optional_brackets: Set[LeafID] = set()
inner_brackets: Set[LeafID] = set()
for index, leaf, leaf_length in enumerate_with_length(line, reversed=True):
length += leaf_length
@@ -2895,17 +3149,12 @@ def generate_trailers_to_omit(line: Line, line_length: int) -> Iterator[Set[Leaf
if leaf.type == STANDALONE_COMMENT or has_inline_comment:
break
- optional_brackets.discard(id(leaf))
if opening_bracket:
if leaf is opening_bracket:
opening_bracket = None
elif leaf.type in CLOSING_BRACKETS:
inner_brackets.add(id(leaf))
elif leaf.type in CLOSING_BRACKETS:
- if not leaf.value:
- optional_brackets.add(id(opening_bracket))
- continue
-
if index > 0 and line.leaves[index - 1].type in OPENING_BRACKETS:
# Empty brackets would fail a split so treat them as "inner"
# brackets (e.g. only add them to the `omit` set if another
@@ -2913,18 +3162,36 @@ def generate_trailers_to_omit(line: Line, line_length: int) -> Iterator[Set[Leaf
inner_brackets.add(id(leaf))
continue
- opening_bracket = leaf.opening_bracket
if closing_bracket:
omit.add(id(closing_bracket))
omit.update(inner_brackets)
inner_brackets.clear()
yield omit
- closing_bracket = leaf
+
+ if leaf.value:
+ opening_bracket = leaf.opening_bracket
+ closing_bracket = leaf
def get_future_imports(node: Node) -> Set[str]:
"""Return a set of __future__ imports in the file."""
- imports = set()
+ imports: Set[str] = set()
+
+ def get_imports_from_children(children: List[LN]) -> Generator[str, None, None]:
+ for child in children:
+ if isinstance(child, Leaf):
+ if child.type == token.NAME:
+ yield child.value
+ elif child.type == syms.import_as_name:
+ orig_name = child.children[0]
+ assert isinstance(orig_name, Leaf), "Invalid syntax parsing imports"
+ assert orig_name.type == token.NAME, "Invalid syntax parsing imports"
+ yield orig_name.value
+ elif child.type == syms.import_as_names:
+ yield from get_imports_from_children(child.children)
+ else:
+ raise AssertionError("Invalid syntax parsing imports")
+
for child in node.children:
if child.type != syms.simple_stmt:
break
@@ -2943,15 +3210,7 @@ def get_future_imports(node: Node) -> Set[str]:
module_name = first_child.children[1]
if not isinstance(module_name, Leaf) or module_name.value != "__future__":
break
- for import_from_child in first_child.children[3:]:
- if isinstance(import_from_child, Leaf):
- if import_from_child.type == token.NAME:
- imports.add(import_from_child.value)
- else:
- assert import_from_child.type == syms.import_as_names
- for leaf in import_from_child.children:
- if isinstance(leaf, Leaf) and leaf.type == token.NAME:
- imports.add(leaf.value)
+ imports |= set(get_imports_from_children(first_child.children[3:]))
else:
break
return imports
@@ -2967,7 +3226,7 @@ def gen_python_files_in_dir(
"""Generate all files under `path` whose paths are not excluded by the
`exclude` regex, but are included by the `include` regex.
- Symbolic links pointing outside of the root directory are ignored.
+ Symbolic links pointing outside of the `root` directory are ignored.
`report` is where output about exclusions goes.
"""
@@ -2978,8 +3237,7 @@ def gen_python_files_in_dir(
except ValueError:
if child.is_symlink():
report.path_ignored(
- child,
- "is a symbolic link that points outside of the root directory",
+ child, f"is a symbolic link that points outside {root}"
)
continue
@@ -3077,7 +3335,7 @@ class Report:
- otherwise return 0.
"""
# According to http://tldp.org/LDP/abs/html/exitcodes.html starting with
- # 126 we have special returncodes reserved by the shell.
+ # 126 we have special return codes reserved by the shell.
if self.failure_count:
return 123
@@ -3136,7 +3394,16 @@ def assert_equivalent(src: str, dst: str) -> None:
if isinstance(value, list):
for item in value:
- if isinstance(item, ast.AST):
+ # Ignore nested tuples within del statements, because we may insert
+ # parentheses and they change the AST.
+ if (
+ field == "targets"
+ and isinstance(node, ast.Delete)
+ and isinstance(item, ast.Tuple)
+ ):
+ for item in item.elts:
+ yield from _v(item, depth + 2)
+ elif isinstance(item, ast.AST):
yield from _v(item, depth + 2)
elif isinstance(value, ast.AST):
@@ -3163,7 +3430,7 @@ def assert_equivalent(src: str, dst: str) -> None:
log = dump_to_file("".join(traceback.format_tb(exc.__traceback__)), dst)
raise AssertionError(
f"INTERNAL ERROR: Black produced invalid code: {exc}. "
- f"Please report a bug on https://github.com/ambv/black/issues. "
+ f"Please report a bug on https://github.com/python/black/issues. "
f"This invalid output might be helpful: {log}"
) from None
@@ -3174,16 +3441,14 @@ def assert_equivalent(src: str, dst: str) -> None:
raise AssertionError(
f"INTERNAL ERROR: Black produced code that is not equivalent to "
f"the source. "
- f"Please report a bug on https://github.com/ambv/black/issues. "
+ f"Please report a bug on https://github.com/python/black/issues. "
f"This diff might be helpful: {log}"
) from None
-def assert_stable(
- src: str, dst: str, line_length: int, mode: FileMode = FileMode.AUTO_DETECT
-) -> None:
+def assert_stable(src: str, dst: str, mode: FileMode) -> None:
"""Raise AssertionError if `dst` reformats differently the second time."""
- newdst = format_str(dst, line_length=line_length, mode=mode)
+ newdst = format_str(dst, mode=mode)
if dst != newdst:
log = dump_to_file(
diff(src, dst, "source", "first pass"),
@@ -3192,7 +3457,7 @@ def assert_stable(
raise AssertionError(
f"INTERNAL ERROR: Black produced different code on the second pass "
f"of the formatter. "
- f"Please report a bug on https://github.com/ambv/black/issues. "
+ f"Please report a bug on https://github.com/python/black/issues. "
f"This diff might be helpful: {log}"
) from None
@@ -3232,8 +3497,12 @@ def cancel(tasks: Iterable[asyncio.Task]) -> None:
def shutdown(loop: BaseEventLoop) -> None:
"""Cancel all pending tasks on `loop`, wait for them, and close the loop."""
try:
+ if sys.version_info[:2] >= (3, 7):
+ all_tasks = asyncio.all_tasks
+ else:
+ all_tasks = asyncio.Task.all_tasks
# This part is borrowed from asyncio/runners.py in Python 3.7b2.
- to_cancel = [task for task in asyncio.Task.all_tasks(loop) if not task.done()]
+ to_cancel = [task for task in all_tasks(loop) if not task.done()]
if not to_cancel:
return
@@ -3295,7 +3564,7 @@ def enumerate_with_length(
return # Multiline strings, we can't continue.
comment: Optional[Leaf]
- for comment in line.comments_after(leaf, index):
+ for comment in line.comments_after(leaf):
length += len(comment.value)
yield index, leaf, length
@@ -3440,16 +3709,16 @@ def can_omit_invisible_parens(line: Line, line_length: int) -> bool:
return False
-def get_cache_file(line_length: int, mode: FileMode) -> Path:
- return CACHE_DIR / f"cache.{line_length}.{mode.value}.pickle"
+def get_cache_file(mode: FileMode) -> Path:
+ return CACHE_DIR / f"cache.{mode.get_cache_key()}.pickle"
-def read_cache(line_length: int, mode: FileMode) -> Cache:
+def read_cache(mode: FileMode) -> Cache:
"""Read the cache if it exists and is well formed.
If it is not well formed, the call to write_cache later should resolve the issue.
"""
- cache_file = get_cache_file(line_length, mode)
+ cache_file = get_cache_file(mode)
if not cache_file.exists():
return {}
@@ -3484,20 +3753,46 @@ def filter_cached(cache: Cache, sources: Iterable[Path]) -> Tuple[Set[Path], Set
return todo, done
-def write_cache(
- cache: Cache, sources: Iterable[Path], line_length: int, mode: FileMode
-) -> None:
+def write_cache(cache: Cache, sources: Iterable[Path], mode: FileMode) -> None:
"""Update the cache file."""
- cache_file = get_cache_file(line_length, mode)
+ cache_file = get_cache_file(mode)
try:
- if not CACHE_DIR.exists():
- CACHE_DIR.mkdir(parents=True)
+ CACHE_DIR.mkdir(parents=True, exist_ok=True)
new_cache = {**cache, **{src.resolve(): get_cache_info(src) for src in sources}}
- with cache_file.open("wb") as fobj:
- pickle.dump(new_cache, fobj, protocol=pickle.HIGHEST_PROTOCOL)
+ with tempfile.NamedTemporaryFile(dir=str(cache_file.parent), delete=False) as f:
+ pickle.dump(new_cache, f, protocol=pickle.HIGHEST_PROTOCOL)
+ os.replace(f.name, cache_file)
except OSError:
pass
-if __name__ == "__main__":
+def patch_click() -> None:
+ """Make Click not crash.
+
+ On certain misconfigured environments, Python 3 selects the ASCII encoding as the
+ default which restricts paths that it can access during the lifetime of the
+ application. Click refuses to work in this scenario by raising a RuntimeError.
+
+ In case of Black the likelihood that non-ASCII characters are going to be used in
+ file paths is minimal since it's Python source code. Moreover, this crash was
+ spurious on Python 3.7 thanks to PEP 538 and PEP 540.
+ """
+ try:
+ from click import core
+ from click import _unicodefun # type: ignore
+ except ModuleNotFoundError:
+ return
+
+ for module in (core, _unicodefun):
+ if hasattr(module, "_verify_python3_env"):
+ module._verify_python3_env = lambda: None
+
+
+def patched_main() -> None:
+ freeze_support()
+ patch_click()
main()
+
+
+if __name__ == "__main__":
+ patched_main()