import asyncio
+from json.decoder import JSONDecodeError
+import json
from concurrent.futures import Executor, ThreadPoolExecutor, ProcessPoolExecutor
from contextlib import contextmanager
from datetime import datetime
from multiprocessing import Manager, freeze_support
import os
from pathlib import Path
-import regex as re
+from pathspec.patterns.gitwildmatch import GitWildMatchPatternError
+import re
import signal
import sys
import tokenize
Generator,
Iterator,
List,
+ MutableMapping,
Optional,
Pattern,
+ Sequence,
Set,
Sized,
Tuple,
Union,
)
-from dataclasses import replace
import click
+from click.core import ParameterSource
+from dataclasses import replace
+from mypy_extensions import mypyc_attr
from black.const import DEFAULT_LINE_LENGTH, DEFAULT_INCLUDES, DEFAULT_EXCLUDES
from black.const import STDIN_PLACEHOLDER
from black.nodes import STARS, syms, is_simple_decorator_expression
+from black.nodes import is_string_token
from black.lines import Line, EmptyLineTracker
from black.linegen import transform_line, LineGenerator, LN
from black.comments import normalize_fmt_off
-from black.mode import Mode, TargetVersion
+from black.mode import FUTURE_FLAG_TO_FEATURE, Mode, TargetVersion
from black.mode import Feature, supports_feature, VERSION_TO_FEATURES
from black.cache import read_cache, write_cache, get_cache_info, filter_cached, Cache
-from black.concurrency import cancel, shutdown
-from black.output import dump_to_file, diff, color_diff, out, err
-from black.report import Report, Changed
+from black.concurrency import cancel, shutdown, maybe_install_uvloop
+from black.output import dump_to_file, ipynb_diff, diff, color_diff, out, err
+from black.report import Report, Changed, NothingChanged
from black.files import find_project_root, find_pyproject_toml, parse_pyproject_toml
from black.files import gen_python_files, get_gitignore, normalize_path_maybe_ignore
from black.files import wrap_stream_for_windows
from black.parsing import InvalidInput # noqa F401
from black.parsing import lib2to3_parse, parse_ast, stringify_ast
+from black.handle_ipynb_magics import (
+ mask_cell,
+ unmask_cell,
+ remove_trailing_semicolon,
+ put_trailing_semicolon_back,
+ TRANSFORMED_MAGICS,
+ PYTHON_CELL_MAGICS,
+ jupyter_dependencies_are_installed,
+)
# lib2to3 fork
from _black_version import version as __version__
+COMPILED = Path(__file__).suffix in (".pyd", ".so")
# types
FileContent = str
NewLine = str
-class NothingChanged(UserWarning):
- """Raised when reformatted code is the same as source."""
-
-
class WriteBack(Enum):
NO = 0
YES = 1
# Legacy name, left for integrations.
FileMode = Mode
+DEFAULT_WORKERS = os.cpu_count()
+
def read_pyproject_toml(
ctx: click.Context, param: click.Parameter, value: Optional[str]
except (OSError, ValueError) as e:
raise click.FileError(
filename=value, hint=f"Error reading configuration file: {e}"
- )
+ ) from None
if not config:
return None
ctx: click.Context,
param: click.Parameter,
value: Optional[str],
-) -> Optional[Pattern]:
+) -> Optional[Pattern[str]]:
try:
return re_compile_maybe_verbose(value) if value is not None else None
- except re.error:
- raise click.BadParameter("Not a valid regular expression")
+ except re.error as e:
+ raise click.BadParameter(f"Not a valid regular expression: {e}") from None
-@click.command(context_settings=dict(help_option_names=["-h", "--help"]))
+@click.command(
+ context_settings={"help_option_names": ["-h", "--help"]},
+ # While Click does set this field automatically using the docstring, mypyc
+ # (annoyingly) strips 'em so we need to set it here too.
+ help="The uncompromising code formatter.",
+)
@click.option("-c", "--code", type=str, help="Format the code passed in as a string.")
@click.option(
"-l",
" when piping source on standard input)."
),
)
+@click.option(
+ "--ipynb",
+ is_flag=True,
+ help=(
+ "Format all input files like Jupyter Notebooks regardless of file extension "
+ "(useful when piping source on standard input)."
+ ),
+)
+@click.option(
+ "--python-cell-magics",
+ multiple=True,
+ help=(
+ "When processing Jupyter Notebooks, add the given magic to the list"
+ f" of known python-magics ({', '.join(PYTHON_CELL_MAGICS)})."
+ " Useful for formatting cells with custom python magics."
+ ),
+ default=[],
+)
@click.option(
"-S",
"--skip-string-normalization",
"--experimental-string-processing",
is_flag=True,
hidden=True,
+ help="(DEPRECATED and now included in --preview) Normalize string literals.",
+)
+@click.option(
+ "--preview",
+ is_flag=True,
help=(
- "Experimental option that performs more normalization on string literals."
- " Currently disabled because it leads to some crashes."
+ "Enable potentially disruptive style changes that will be added to Black's main"
+ " functionality in the next major release."
),
)
@click.option(
is_flag=True,
help="If --fast given, skip temporary sanity checks. [default: --safe]",
)
+@click.option(
+ "--required-version",
+ type=str,
+ help=(
+ "Require a specific version of Black to be running (useful for unifying results"
+ " across many environments e.g. with a pyproject.toml file)."
+ ),
+)
@click.option(
"--include",
type=str,
"editors that rely on using stdin."
),
)
+@click.option(
+ "-W",
+ "--workers",
+ type=click.IntRange(min=1),
+ default=DEFAULT_WORKERS,
+ show_default=True,
+ help="Number of parallel workers",
+)
@click.option(
"-q",
"--quiet",
" due to exclusion patterns."
),
)
-@click.version_option(version=__version__)
+@click.version_option(
+ version=__version__,
+ message=f"%(prog)s, %(version)s (compiled: {'yes' if COMPILED else 'no'})",
+)
@click.argument(
"src",
nargs=-1,
exists=True, file_okay=True, dir_okay=True, readable=True, allow_dash=True
),
is_eager=True,
+ metavar="SRC ...",
)
@click.option(
"--config",
color: bool,
fast: bool,
pyi: bool,
+ ipynb: bool,
+ python_cell_magics: Sequence[str],
skip_string_normalization: bool,
skip_magic_trailing_comma: bool,
experimental_string_processing: bool,
+ preview: bool,
quiet: bool,
verbose: bool,
- include: Pattern,
- exclude: Optional[Pattern],
- extend_exclude: Optional[Pattern],
- force_exclude: Optional[Pattern],
+ required_version: Optional[str],
+ include: Pattern[str],
+ exclude: Optional[Pattern[str]],
+ extend_exclude: Optional[Pattern[str]],
+ force_exclude: Optional[Pattern[str]],
stdin_filename: Optional[str],
+ workers: int,
src: Tuple[str, ...],
config: Optional[str],
) -> None:
"""The uncompromising code formatter."""
+ ctx.ensure_object(dict)
+ root, method = find_project_root(src) if code is None else (None, None)
+ ctx.obj["root"] = root
+
+ if verbose:
+ if root:
+ out(
+ f"Identified `{root}` as project root containing a {method}.",
+ fg="blue",
+ )
+
+ normalized = [
+ (normalize_path_maybe_ignore(Path(source), root), source)
+ for source in src
+ ]
+ srcs_string = ", ".join(
+ [
+ f'"{_norm}"'
+ if _norm
+ else f'\033[31m"{source} (skipping - invalid)"\033[34m'
+ for _norm, source in normalized
+ ]
+ )
+ out(f"Sources to be formatted: {srcs_string}", fg="blue")
+
+ if config:
+ config_source = ctx.get_parameter_source("config")
+ if config_source in (ParameterSource.DEFAULT, ParameterSource.DEFAULT_MAP):
+ out("Using configuration from project root.", fg="blue")
+ else:
+ out(f"Using configuration in '{config}'.", fg="blue")
+
+ error_msg = "Oh no! 💥 💔 💥"
+ if required_version and required_version != __version__:
+ err(
+ f"{error_msg} The required version `{required_version}` does not match"
+ f" the running version `{__version__}`!"
+ )
+ ctx.exit(1)
+ if ipynb and pyi:
+ err("Cannot pass both `pyi` and `ipynb` flags!")
+ ctx.exit(1)
+
write_back = WriteBack.from_configuration(check=check, diff=diff, color=color)
if target_version:
versions = set(target_version)
target_versions=versions,
line_length=line_length,
is_pyi=pyi,
+ is_ipynb=ipynb,
string_normalization=not skip_string_normalization,
magic_trailing_comma=not skip_magic_trailing_comma,
experimental_string_processing=experimental_string_processing,
+ preview=preview,
+ python_cell_magics=set(python_cell_magics),
)
- 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)
- report = Report(check=check, diff=diff, quiet=quiet, verbose=verbose)
- sources = get_sources(
- ctx=ctx,
- src=src,
- quiet=quiet,
- verbose=verbose,
- include=include,
- exclude=exclude,
- extend_exclude=extend_exclude,
- force_exclude=force_exclude,
- report=report,
- stdin_filename=stdin_filename,
- )
+ # Run in quiet mode by default with -c; the extra output isn't useful.
+ # You can still pass -v to get verbose output.
+ quiet = True
- path_empty(
- sources,
- "No Python files are present to be formatted. Nothing to do 😴",
- quiet,
- verbose,
- ctx,
- )
+ report = Report(check=check, diff=diff, quiet=quiet, verbose=verbose)
- if len(sources) == 1:
- reformat_one(
- src=sources.pop(),
- fast=fast,
- write_back=write_back,
- mode=mode,
- report=report,
+ if code is not None:
+ reformat_code(
+ content=code, fast=fast, write_back=write_back, mode=mode, report=report
)
else:
- reformat_many(
- sources=sources, fast=fast, write_back=write_back, mode=mode, report=report
+ try:
+ sources = get_sources(
+ ctx=ctx,
+ src=src,
+ quiet=quiet,
+ verbose=verbose,
+ include=include,
+ exclude=exclude,
+ extend_exclude=extend_exclude,
+ force_exclude=force_exclude,
+ report=report,
+ stdin_filename=stdin_filename,
+ )
+ except GitWildMatchPatternError:
+ ctx.exit(1)
+
+ path_empty(
+ sources,
+ "No Python files are present to be formatted. Nothing to do 😴",
+ quiet,
+ verbose,
+ ctx,
)
+ if len(sources) == 1:
+ reformat_one(
+ src=sources.pop(),
+ fast=fast,
+ write_back=write_back,
+ mode=mode,
+ report=report,
+ )
+ else:
+ reformat_many(
+ sources=sources,
+ fast=fast,
+ write_back=write_back,
+ mode=mode,
+ report=report,
+ workers=workers,
+ )
+
if verbose or not quiet:
- out("Oh no! 💥 💔 💥" if report.return_code else "All done! ✨ 🍰 ✨")
- click.secho(str(report), err=True)
+ if code is None and (verbose or report.change_count or report.failure_count):
+ out()
+ out(error_msg if report.return_code else "All done! ✨ 🍰 ✨")
+ if code is None:
+ click.echo(str(report), err=True)
ctx.exit(report.return_code)
stdin_filename: Optional[str],
) -> Set[Path]:
"""Compute the set of files to be formatted."""
-
- root = find_project_root(src)
sources: Set[Path] = set()
path_empty(src, "No Path provided. Nothing to do 😴", quiet, verbose, ctx)
if exclude is None:
exclude = re_compile_maybe_verbose(DEFAULT_EXCLUDES)
- gitignore = get_gitignore(root)
+ gitignore = get_gitignore(ctx.obj["root"])
else:
gitignore = None
is_stdin = False
if is_stdin or p.is_file():
- normalized_path = normalize_path_maybe_ignore(p, root, report)
+ normalized_path = normalize_path_maybe_ignore(p, ctx.obj["root"], report)
if normalized_path is None:
continue
if is_stdin:
p = Path(f"{STDIN_PLACEHOLDER}{str(p)}")
+ if p.suffix == ".ipynb" and not jupyter_dependencies_are_installed(
+ verbose=verbose, quiet=quiet
+ ):
+ continue
+
sources.add(p)
elif p.is_dir():
sources.update(
gen_python_files(
p.iterdir(),
- root,
+ ctx.obj["root"],
include,
exclude,
extend_exclude,
force_exclude,
report,
gitignore,
+ verbose=verbose,
+ quiet=quiet,
)
)
elif s == "-":
"""
Exit if there is no `src` provided for formatting
"""
- if not src and (verbose or not quiet):
- out(msg)
+ if not src:
+ if verbose or not quiet:
+ out(msg)
ctx.exit(0)
+def reformat_code(
+ content: str, fast: bool, write_back: WriteBack, mode: Mode, report: Report
+) -> None:
+ """
+ Reformat and print out `content` without spawning child processes.
+ Similar to `reformat_one`, but for string content.
+
+ `fast`, `write_back`, and `mode` options are passed to
+ :func:`format_file_in_place` or :func:`format_stdin_to_stdout`.
+ """
+ path = Path("<string>")
+ try:
+ changed = Changed.NO
+ if format_stdin_to_stdout(
+ content=content, fast=fast, write_back=write_back, mode=mode
+ ):
+ changed = Changed.YES
+ report.done(path, changed)
+ except Exception as exc:
+ if report.verbose:
+ traceback.print_exc()
+ report.failed(path, str(exc))
+
+
def reformat_one(
src: Path, fast: bool, write_back: WriteBack, mode: Mode, report: "Report"
) -> None:
if is_stdin:
if src.suffix == ".pyi":
mode = replace(mode, is_pyi=True)
+ elif src.suffix == ".ipynb":
+ mode = replace(mode, is_ipynb=True)
if format_stdin_to_stdout(fast=fast, write_back=write_back, mode=mode):
changed = Changed.YES
else:
report.failed(src, str(exc))
+# diff-shades depends on being to monkeypatch this function to operate. I know it's
+# not ideal, but this shouldn't cause any issues ... hopefully. ~ichard26
+@mypyc_attr(patchable=True)
def reformat_many(
- sources: Set[Path], fast: bool, write_back: WriteBack, mode: Mode, report: "Report"
+ sources: Set[Path],
+ fast: bool,
+ write_back: WriteBack,
+ mode: Mode,
+ report: "Report",
+ workers: Optional[int],
) -> None:
"""Reformat multiple files using a ProcessPoolExecutor."""
executor: Executor
loop = asyncio.get_event_loop()
- worker_count = os.cpu_count()
+ worker_count = workers if workers is not None else DEFAULT_WORKERS
if sys.platform == "win32":
# Work around https://bugs.python.org/issue26903
+ assert worker_count is not None
worker_count = min(worker_count, 60)
try:
executor = ProcessPoolExecutor(max_workers=worker_count)
- except (ImportError, OSError):
+ except (ImportError, NotImplementedError, OSError):
# we arrive here if the underlying system does not support multi-processing
# like in AWS Lambda or Termux, in which case we gracefully fallback to
# a ThreadPoolExecutor with just a single worker (more workers would not do us
sources_to_cache.append(src)
report.done(src, changed)
if cancelled:
- await asyncio.gather(*cancelled, loop=loop, return_exceptions=True)
+ if sys.version_info >= (3, 7):
+ await asyncio.gather(*cancelled, return_exceptions=True)
+ else:
+ await asyncio.gather(*cancelled, loop=loop, return_exceptions=True)
if sources_to_cache:
write_cache(cache, sources_to_cache, mode)
"""
if src.suffix == ".pyi":
mode = replace(mode, is_pyi=True)
+ elif src.suffix == ".ipynb":
+ mode = replace(mode, is_ipynb=True)
then = datetime.utcfromtimestamp(src.stat().st_mtime)
with open(src, "rb") as buf:
dst_contents = format_file_contents(src_contents, fast=fast, mode=mode)
except NothingChanged:
return False
+ except JSONDecodeError:
+ raise ValueError(
+ f"File '{src}' cannot be parsed as valid Jupyter notebook."
+ ) from None
if write_back == WriteBack.YES:
with open(src, "w", encoding=encoding, newline=newline) as f:
now = datetime.utcnow()
src_name = f"{src}\t{then} +0000"
dst_name = f"{src}\t{now} +0000"
- diff_contents = diff(src_contents, dst_contents, src_name, dst_name)
+ if mode.is_ipynb:
+ diff_contents = ipynb_diff(src_contents, dst_contents, src_name, dst_name)
+ else:
+ diff_contents = diff(src_contents, dst_contents, src_name, dst_name)
if write_back == WriteBack.COLOR_DIFF:
diff_contents = color_diff(diff_contents)
def format_stdin_to_stdout(
- fast: bool, *, write_back: WriteBack = WriteBack.NO, mode: Mode
+ fast: bool,
+ *,
+ content: Optional[str] = None,
+ write_back: WriteBack = WriteBack.NO,
+ mode: Mode,
) -> bool:
"""Format file on stdin. Return True if changed.
+ If content is None, it's read from sys.stdin.
+
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())
+
+ if content is None:
+ src, encoding, newline = decode_bytes(sys.stdin.buffer.read())
+ else:
+ src, encoding, newline = content, "utf-8", ""
+
dst = src
try:
dst = format_file_contents(src, fast=fast, mode=mode)
sys.stdout.buffer, encoding=encoding, newline=newline, write_through=True
)
if write_back == WriteBack.YES:
+ # Make sure there's a newline after the content
+ if dst and dst[-1] != "\n":
+ dst += "\n"
f.write(dst)
elif write_back in (WriteBack.DIFF, WriteBack.COLOR_DIFF):
now = datetime.utcnow()
f.detach()
+def check_stability_and_equivalence(
+ src_contents: str, dst_contents: str, *, mode: Mode
+) -> None:
+ """Perform stability and equivalence checks.
+
+ Raise AssertionError if source and destination contents are not
+ equivalent, or if a second pass of the formatter would format the
+ content differently.
+ """
+ assert_equivalent(src_contents, dst_contents)
+
+ # Forced second pass to work around optional trailing commas (becoming
+ # forced trailing commas on pass 2) interacting differently with optional
+ # parentheses. Admittedly ugly.
+ dst_contents_pass2 = format_str(dst_contents, mode=mode)
+ if dst_contents != dst_contents_pass2:
+ dst_contents = dst_contents_pass2
+ assert_equivalent(src_contents, dst_contents, pass_num=2)
+ assert_stable(src_contents, dst_contents, mode=mode)
+ # Note: no need to explicitly call `assert_stable` if `dst_contents` was
+ # the same as `dst_contents_pass2`.
+
+
def format_file_contents(src_contents: str, *, fast: bool, mode: Mode) -> FileContent:
"""Reformat contents of a file and return new contents.
if not src_contents.strip():
raise NothingChanged
- dst_contents = format_str(src_contents, mode=mode)
+ if mode.is_ipynb:
+ dst_contents = format_ipynb_string(src_contents, fast=fast, mode=mode)
+ else:
+ dst_contents = format_str(src_contents, mode=mode)
if src_contents == dst_contents:
raise NothingChanged
- if not fast:
- assert_equivalent(src_contents, dst_contents)
-
- # Forced second pass to work around optional trailing commas (becoming
- # forced trailing commas on pass 2) interacting differently with optional
- # parentheses. Admittedly ugly.
- dst_contents_pass2 = format_str(dst_contents, mode=mode)
- if dst_contents != dst_contents_pass2:
- dst_contents = dst_contents_pass2
- assert_equivalent(src_contents, dst_contents, pass_num=2)
- assert_stable(src_contents, dst_contents, mode=mode)
- # Note: no need to explicitly call `assert_stable` if `dst_contents` was
- # the same as `dst_contents_pass2`.
+ if not fast and not mode.is_ipynb:
+ # Jupyter notebooks will already have been checked above.
+ check_stability_and_equivalence(src_contents, dst_contents, mode=mode)
return dst_contents
+def validate_cell(src: str, mode: Mode) -> None:
+ """Check that cell does not already contain TransformerManager transformations,
+ or non-Python cell magics, which might cause tokenizer_rt to break because of
+ indentations.
+
+ If a cell contains ``!ls``, then it'll be transformed to
+ ``get_ipython().system('ls')``. However, if the cell originally contained
+ ``get_ipython().system('ls')``, then it would get transformed in the same way:
+
+ >>> TransformerManager().transform_cell("get_ipython().system('ls')")
+ "get_ipython().system('ls')\n"
+ >>> TransformerManager().transform_cell("!ls")
+ "get_ipython().system('ls')\n"
+
+ Due to the impossibility of safely roundtripping in such situations, cells
+ containing transformed magics will be ignored.
+ """
+ if any(transformed_magic in src for transformed_magic in TRANSFORMED_MAGICS):
+ raise NothingChanged
+ if (
+ src[:2] == "%%"
+ and src.split()[0][2:] not in PYTHON_CELL_MAGICS | mode.python_cell_magics
+ ):
+ raise NothingChanged
+
+
+def format_cell(src: str, *, fast: bool, mode: Mode) -> str:
+ """Format code in given cell of Jupyter notebook.
+
+ General idea is:
+
+ - if cell has trailing semicolon, remove it;
+ - if cell has IPython magics, mask them;
+ - format cell;
+ - reinstate IPython magics;
+ - reinstate trailing semicolon (if originally present);
+ - strip trailing newlines.
+
+ Cells with syntax errors will not be processed, as they
+ could potentially be automagics or multi-line magics, which
+ are currently not supported.
+ """
+ validate_cell(src, mode)
+ src_without_trailing_semicolon, has_trailing_semicolon = remove_trailing_semicolon(
+ src
+ )
+ try:
+ masked_src, replacements = mask_cell(src_without_trailing_semicolon)
+ except SyntaxError:
+ raise NothingChanged from None
+ masked_dst = format_str(masked_src, mode=mode)
+ if not fast:
+ check_stability_and_equivalence(masked_src, masked_dst, mode=mode)
+ dst_without_trailing_semicolon = unmask_cell(masked_dst, replacements)
+ dst = put_trailing_semicolon_back(
+ dst_without_trailing_semicolon, has_trailing_semicolon
+ )
+ dst = dst.rstrip("\n")
+ if dst == src:
+ raise NothingChanged from None
+ return dst
+
+
+def validate_metadata(nb: MutableMapping[str, Any]) -> None:
+ """If notebook is marked as non-Python, don't format it.
+
+ All notebook metadata fields are optional, see
+ https://nbformat.readthedocs.io/en/latest/format_description.html. So
+ if a notebook has empty metadata, we will try to parse it anyway.
+ """
+ language = nb.get("metadata", {}).get("language_info", {}).get("name", None)
+ if language is not None and language != "python":
+ raise NothingChanged from None
+
+
+def format_ipynb_string(src_contents: str, *, fast: bool, mode: Mode) -> FileContent:
+ """Format Jupyter notebook.
+
+ Operate cell-by-cell, only on code cells, only for Python notebooks.
+ If the ``.ipynb`` originally had a trailing newline, it'll be preserved.
+ """
+ trailing_newline = src_contents[-1] == "\n"
+ modified = False
+ nb = json.loads(src_contents)
+ validate_metadata(nb)
+ for cell in nb["cells"]:
+ if cell.get("cell_type", None) == "code":
+ try:
+ src = "".join(cell["source"])
+ dst = format_cell(src, fast=fast, mode=mode)
+ except NothingChanged:
+ pass
+ else:
+ cell["source"] = dst.splitlines(keepends=True)
+ modified = True
+ if modified:
+ dst_contents = json.dumps(nb, indent=1, ensure_ascii=False)
+ if trailing_newline:
+ dst_contents = dst_contents + "\n"
+ return dst_contents
+ else:
+ raise NothingChanged
+
+
def format_str(src_contents: str, *, mode: Mode) -> FileContent:
"""Reformat a string and return new contents.
if mode.target_versions:
versions = mode.target_versions
else:
- versions = detect_target_versions(src_node)
+ versions = detect_target_versions(src_node, future_imports=future_imports)
+
normalize_fmt_off(src_node)
- lines = LineGenerator(
- mode=mode,
- remove_u_prefix="unicode_literals" in future_imports
- or supports_feature(versions, Feature.UNICODE_LITERALS),
- )
+ lines = LineGenerator(mode=mode)
elt = EmptyLineTracker(is_pyi=mode.is_pyi)
empty_line = Line(mode=mode)
after = 0
return tiow.read(), encoding, newline
-def get_features_used(node: Node) -> Set[Feature]:
+def get_features_used( # noqa: C901
+ node: Node, *, future_imports: Optional[Set[str]] = None
+) -> Set[Feature]:
"""Return a set of (relatively) new Python features used in this file.
Currently looking for:
- positional only arguments in function signatures and lambdas;
- assignment expression;
- relaxed decorator syntax;
+ - usage of __future__ flags (annotations);
+ - print / exec statements;
"""
features: Set[Feature] = set()
+ if future_imports:
+ features |= {
+ FUTURE_FLAG_TO_FEATURE[future_import]
+ for future_import in future_imports
+ if future_import in FUTURE_FLAG_TO_FEATURE
+ }
+
for n in node.pre_order():
- if n.type == token.STRING:
- value_head = n.value[:2] # type: ignore
+ if is_string_token(n):
+ value_head = n.value[:2]
if value_head in {'f"', 'F"', "f'", "F'", "rf", "fr", "RF", "FR"}:
features.add(Feature.F_STRINGS)
elif n.type == token.NUMBER:
- if "_" in n.value: # type: ignore
+ assert isinstance(n, Leaf)
+ if "_" in n.value:
features.add(Feature.NUMERIC_UNDERSCORES)
elif n.type == token.SLASH:
- if n.parent and n.parent.type in {syms.typedargslist, syms.arglist}:
+ if n.parent and n.parent.type in {
+ syms.typedargslist,
+ syms.arglist,
+ syms.varargslist,
+ }:
features.add(Feature.POS_ONLY_ARGUMENTS)
elif n.type == token.COLONEQUAL:
if argch.type in STARS:
features.add(feature)
+ elif (
+ n.type in {syms.return_stmt, syms.yield_expr}
+ and len(n.children) >= 2
+ and n.children[1].type == syms.testlist_star_expr
+ and any(child.type == syms.star_expr for child in n.children[1].children)
+ ):
+ features.add(Feature.UNPACKING_ON_FLOW)
+
+ elif (
+ n.type == syms.annassign
+ and len(n.children) >= 4
+ and n.children[3].type == syms.testlist_star_expr
+ ):
+ features.add(Feature.ANN_ASSIGN_EXTENDED_RHS)
+
return features
-def detect_target_versions(node: Node) -> Set[TargetVersion]:
+def detect_target_versions(
+ node: Node, *, future_imports: Optional[Set[str]] = None
+) -> Set[TargetVersion]:
"""Detect the version to target based on the nodes used."""
- features = get_features_used(node)
+ features = get_features_used(node, future_imports=future_imports)
return {
version for version in TargetVersion if features <= VERSION_TO_FEATURES[version]
}
src_ast = parse_ast(src)
except Exception as exc:
raise AssertionError(
- "cannot use --safe with this file; failed to parse source file. AST"
- f" error message: {exc}"
- )
+ f"cannot use --safe with this file; failed to parse source file AST: "
+ f"{exc}\n"
+ f"This could be caused by running Black with an older Python version "
+ f"that does not support new syntax used in your source file."
+ ) from exc
try:
dst_ast = parse_ast(dst)
def patch_click() -> None:
- """Make Click not crash.
+ """Make Click not crash on Python 3.6 with LANG=C.
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
"""
try:
from click import core
- from click import _unicodefun # type: ignore
+ from click import _unicodefun
except ModuleNotFoundError:
return
for module in (core, _unicodefun):
if hasattr(module, "_verify_python3_env"):
- module._verify_python3_env = lambda: None
+ module._verify_python3_env = lambda: None # type: ignore
+ if hasattr(module, "_verify_python_env"):
+ module._verify_python_env = lambda: None # type: ignore
def patched_main() -> None:
+ maybe_install_uvloop()
freeze_support()
patch_click()
main()
projects / etc / vim.git / blobdiff