X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/e6ddb68c786256e1cb0c76b42d10c212ef34cb2a..729f2d8cafd1b8e44d7c0a6bd841453ffac01c8e:/black.py?ds=inline
diff --git a/black.py b/black.py
index dd6e372..31859d1 100644
--- a/black.py
+++ b/black.py
@@ -1,6 +1,7 @@
+import ast
import asyncio
-from asyncio.base_events import BaseEventLoop
from concurrent.futures import Executor, ProcessPoolExecutor
+from contextlib import contextmanager
from datetime import datetime
from enum import Enum
from functools import lru_cache, partial, wraps
@@ -11,11 +12,12 @@ from multiprocessing import Manager, freeze_support
import os
from pathlib import Path
import pickle
-import re
+import regex as re
import signal
import sys
import tempfile
import tokenize
+import traceback
from typing import (
Any,
Callable,
@@ -35,11 +37,15 @@ from typing import (
Union,
cast,
)
+from typing_extensions import Final
+from mypy_extensions import mypyc_attr
from appdirs import user_cache_dir
-from attr import dataclass, evolve, Factory
+from dataclasses import dataclass, field, replace
import click
import toml
+from typed_ast import ast3, ast27
+from pathspec import PathSpec
# lib2to3 fork
from blib2to3.pytree import Node, Leaf, type_repr
@@ -48,12 +54,10 @@ from blib2to3.pgen2 import driver, token
from blib2to3.pgen2.grammar import Grammar
from blib2to3.pgen2.parse import ParseError
+from _black_version import version as __version__
-__version__ = "19.3b0"
DEFAULT_LINE_LENGTH = 88
-DEFAULT_EXCLUDES = (
- r"/(\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist)/"
-)
+DEFAULT_EXCLUDES = r"/(\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|\.svn|_build|buck-out|build|dist)/" # noqa: B950
DEFAULT_INCLUDES = r"\.pyi?$"
CACHE_DIR = Path(user_cache_dir("black", version=__version__))
@@ -135,19 +139,30 @@ class Feature(Enum):
NUMERIC_UNDERSCORES = 3
TRAILING_COMMA_IN_CALL = 4
TRAILING_COMMA_IN_DEF = 5
+ # The following two feature-flags are mutually exclusive, and exactly one should be
+ # set for every version of python.
+ ASYNC_IDENTIFIERS = 6
+ ASYNC_KEYWORDS = 7
+ ASSIGNMENT_EXPRESSIONS = 8
+ POS_ONLY_ARGUMENTS = 9
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.PY27: {Feature.ASYNC_IDENTIFIERS},
+ TargetVersion.PY33: {Feature.UNICODE_LITERALS, Feature.ASYNC_IDENTIFIERS},
+ TargetVersion.PY34: {Feature.UNICODE_LITERALS, Feature.ASYNC_IDENTIFIERS},
+ TargetVersion.PY35: {
+ Feature.UNICODE_LITERALS,
+ Feature.TRAILING_COMMA_IN_CALL,
+ Feature.ASYNC_IDENTIFIERS,
+ },
TargetVersion.PY36: {
Feature.UNICODE_LITERALS,
Feature.F_STRINGS,
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
+ Feature.ASYNC_IDENTIFIERS,
},
TargetVersion.PY37: {
Feature.UNICODE_LITERALS,
@@ -155,6 +170,7 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
+ Feature.ASYNC_KEYWORDS,
},
TargetVersion.PY38: {
Feature.UNICODE_LITERALS,
@@ -162,13 +178,16 @@ VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = {
Feature.NUMERIC_UNDERSCORES,
Feature.TRAILING_COMMA_IN_CALL,
Feature.TRAILING_COMMA_IN_DEF,
+ Feature.ASYNC_KEYWORDS,
+ Feature.ASSIGNMENT_EXPRESSIONS,
+ Feature.POS_ONLY_ARGUMENTS,
},
}
@dataclass
-class FileMode:
- target_versions: Set[TargetVersion] = Factory(set)
+class Mode:
+ target_versions: Set[TargetVersion] = field(default_factory=set)
line_length: int = DEFAULT_LINE_LENGTH
string_normalization: bool = True
is_pyi: bool = False
@@ -190,10 +209,31 @@ class FileMode:
return ".".join(parts)
+# Legacy name, left for integrations.
+FileMode = 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 find_pyproject_toml(path_search_start: str) -> Optional[str]:
+ """Find the absolute filepath to a pyproject.toml if it exists"""
+ path_project_root = find_project_root(path_search_start)
+ path_pyproject_toml = path_project_root / "pyproject.toml"
+ return str(path_pyproject_toml) if path_pyproject_toml.is_file() else None
+
+
+def parse_pyproject_toml(path_config: str) -> Dict[str, Any]:
+ """Parse a pyproject toml file, pulling out relevant parts for Black
+
+ If parsing fails, will raise a toml.TomlDecodeError
+ """
+ pyproject_toml = toml.load(path_config)
+ config = pyproject_toml.get("tool", {}).get("black", {})
+ return {k.replace("--", "").replace("-", "_"): v for k, v in config.items()}
+
+
def read_pyproject_toml(
ctx: click.Context, param: click.Parameter, value: Union[str, int, bool, None]
) -> Optional[str]:
@@ -204,16 +244,12 @@ def read_pyproject_toml(
"""
assert not isinstance(value, (int, bool)), "Invalid parameter type passed"
if not value:
- root = find_project_root(ctx.params.get("src", ()))
- path = root / "pyproject.toml"
- if path.is_file():
- value = str(path)
- else:
+ value = find_pyproject_toml(ctx.params.get("src", ()))
+ if value is None:
return None
try:
- pyproject_toml = toml.load(value)
- config = pyproject_toml.get("tool", {}).get("black", {})
+ config = parse_pyproject_toml(value)
except (toml.TomlDecodeError, OSError) as e:
raise click.FileError(
filename=value, hint=f"Error reading configuration file: {e}"
@@ -224,13 +260,23 @@ def read_pyproject_toml(
if ctx.default_map is None:
ctx.default_map = {}
- ctx.default_map.update( # type: ignore # bad types in .pyi
- {k.replace("--", "").replace("-", "_"): v for k, v in config.items()}
- )
+ ctx.default_map.update(config) # type: ignore # bad types in .pyi
return value
+def target_version_option_callback(
+ c: click.Context, p: Union[click.Option, click.Parameter], v: Tuple[str, ...]
+) -> List[TargetVersion]:
+ """Compute the target versions from a --target-version flag.
+
+ This is its own function because mypy couldn't infer the type correctly
+ when it was a lambda, causing mypyc trouble.
+ """
+ return [TargetVersion[val.upper()] for val in v]
+
+
@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",
@@ -243,7 +289,7 @@ def read_pyproject_toml(
"-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],
+ callback=target_version_option_callback,
multiple=True,
help=(
"Python versions that should be supported by Black's output. [default: "
@@ -323,7 +369,7 @@ def read_pyproject_toml(
"--quiet",
is_flag=True,
help=(
- "Don't emit non-error messages to stderr. Errors are still emitted, "
+ "Don't emit non-error messages to stderr. Errors are still emitted; "
"silence those with 2>/dev/null."
),
)
@@ -357,6 +403,7 @@ def read_pyproject_toml(
@click.pass_context
def main(
ctx: click.Context,
+ code: Optional[str],
line_length: int,
target_version: List[TargetVersion],
check: bool,
@@ -369,7 +416,7 @@ def main(
verbose: bool,
include: str,
exclude: str,
- src: Tuple[str],
+ src: Tuple[str, ...],
config: Optional[str],
) -> None:
"""The uncompromising code formatter."""
@@ -389,7 +436,7 @@ def main(
else:
# We'll autodetect later.
versions = set()
- mode = FileMode(
+ mode = Mode(
target_versions=versions,
line_length=line_length,
is_pyi=pyi,
@@ -397,6 +444,9 @@ def main(
)
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:
@@ -407,14 +457,17 @@ def main(
except re.error:
err(f"Invalid regular expression for exclude given: {exclude!r}")
ctx.exit(2)
- report = Report(check=check, quiet=quiet, verbose=verbose)
+ report = Report(check=check, diff=diff, quiet=quiet, verbose=verbose)
root = find_project_root(src)
sources: Set[Path] = set()
+ path_empty(src, quiet, verbose, ctx)
for s in src:
p = Path(s)
if p.is_dir():
sources.update(
- gen_python_files_in_dir(p, root, include_regex, exclude_regex, report)
+ gen_python_files_in_dir(
+ p, root, include_regex, exclude_regex, report, get_gitignore(root)
+ )
)
elif p.is_file() or s == "-":
# if a file was explicitly given, we don't care about its extension
@@ -423,7 +476,7 @@ def main(
err(f"invalid path: {s}")
if len(sources) == 0:
if verbose or not quiet:
- out("No paths given. Nothing to do ð´")
+ out("No Python files are present to be formatted. Nothing to do ð´")
ctx.exit(0)
if len(sources) == 1:
@@ -435,36 +488,34 @@ def main(
report=report,
)
else:
- loop = asyncio.get_event_loop()
- executor = ProcessPoolExecutor(max_workers=os.cpu_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)
+ 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}")
+ out("Oh no! ð¥ ð ð¥" if report.return_code else "All done! ⨠ð° â¨")
click.secho(str(report), err=True)
ctx.exit(report.return_code)
+def path_empty(
+ src: Tuple[str, ...], quiet: bool, verbose: bool, ctx: click.Context
+) -> None:
+ """
+ Exit if there is no `src` provided for formatting
+ """
+ if not src:
+ if verbose or not quiet:
+ out("No Path provided. Nothing to do ð´")
+ ctx.exit(0)
+
+
def reformat_one(
- src: Path, fast: bool, write_back: WriteBack, mode: FileMode, report: "Report"
+ src: Path, fast: bool, write_back: WriteBack, mode: Mode, report: "Report"
) -> None:
"""Reformat a single file under `src` without spawning child processes.
- If `quiet` is True, non-error messages are not output. `line_length`,
- `write_back`, `fast` and `pyi` options are passed to
+ `fast`, `write_back`, and `mode` options are passed to
:func:`format_file_in_place` or :func:`format_stdin_to_stdout`.
"""
try:
@@ -492,20 +543,47 @@ def reformat_one(
report.failed(src, str(exc))
+def reformat_many(
+ sources: Set[Path], fast: bool, write_back: WriteBack, mode: Mode, 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)
+ executor.shutdown()
+
+
async def schedule_formatting(
sources: Set[Path],
fast: bool,
write_back: WriteBack,
- mode: FileMode,
+ mode: Mode,
report: "Report",
- loop: BaseEventLoop,
+ loop: asyncio.AbstractEventLoop,
executor: Executor,
) -> None:
"""Run formatting of `sources` in parallel using the provided `executor`.
(Use ProcessPoolExecutors for actual parallelism.)
- `line_length`, `write_back`, `fast`, and `pyi` options are passed to
+ `write_back`, `fast`, and `mode` options are passed to
:func:`format_file_in_place`.
"""
cache: Cache = {}
@@ -533,7 +611,7 @@ async def schedule_formatting(
): src
for src in sorted(sources)
}
- pending: Iterable[asyncio.Future] = tasks.keys()
+ pending: Iterable["asyncio.Future[bool]"] = tasks.keys()
try:
loop.add_signal_handler(signal.SIGINT, cancel, pending)
loop.add_signal_handler(signal.SIGTERM, cancel, pending)
@@ -566,7 +644,7 @@ async def schedule_formatting(
def format_file_in_place(
src: Path,
fast: bool,
- mode: FileMode,
+ mode: Mode,
write_back: WriteBack = WriteBack.NO,
lock: Any = None, # multiprocessing.Manager().Lock() is some crazy proxy
) -> bool:
@@ -574,10 +652,10 @@ def format_file_in_place(
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`.
+ `mode` and `fast` options are passed to :func:`format_file_contents`.
"""
if src.suffix == ".pyi":
- mode = evolve(mode, is_pyi=True)
+ mode = replace(mode, is_pyi=True)
then = datetime.utcfromtimestamp(src.stat().st_mtime)
with open(src, "rb") as buf:
@@ -587,17 +665,16 @@ def format_file_in_place(
except NothingChanged:
return False
- if write_back == write_back.YES:
+ if write_back == WriteBack.YES:
with open(src, "w", encoding=encoding, newline=newline) as f:
f.write(dst_contents)
- elif write_back == write_back.DIFF:
+ elif write_back == WriteBack.DIFF:
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 lock:
- lock.acquire()
- try:
+
+ with lock or nullcontext():
f = io.TextIOWrapper(
sys.stdout.buffer,
encoding=encoding,
@@ -606,14 +683,12 @@ def format_file_in_place(
)
f.write(diff_contents)
f.detach()
- finally:
- if lock:
- lock.release()
+
return True
def format_stdin_to_stdout(
- fast: bool, *, write_back: WriteBack = WriteBack.NO, mode: FileMode
+ fast: bool, *, write_back: WriteBack = WriteBack.NO, mode: Mode
) -> bool:
"""Format file on stdin. Return True if changed.
@@ -645,14 +720,12 @@ def format_stdin_to_stdout(
f.detach()
-def format_file_contents(
- src_contents: str, *, fast: bool, mode: FileMode
-) -> FileContent:
+def format_file_contents(src_contents: str, *, fast: bool, mode: Mode) -> FileContent:
"""Reformat contents a file and return new contents.
If `fast` is False, additionally confirm that the reformatted code is
valid by calling :func:`assert_equivalent` and :func:`assert_stable` on it.
- `line_length` is passed to :func:`format_str`.
+ `mode` is passed to :func:`format_str`.
"""
if src_contents.strip() == "":
raise NothingChanged
@@ -667,13 +740,37 @@ def format_file_contents(
return dst_contents
-def format_str(src_contents: str, *, mode: FileMode) -> FileContent:
+def format_str(src_contents: str, *, mode: Mode) -> FileContent:
"""Reformat a string and return new contents.
- `line_length` determines how many characters per line are allowed.
+ `mode` determines formatting options, such as how many characters per line are
+ allowed. Example:
+
+ >>> import black
+ >>> print(black.format_str("def f(arg:str='')->None:...", mode=Mode()))
+ def f(arg: str = "") -> None:
+ ...
+
+ A more complex example:
+ >>> print(
+ ... black.format_str(
+ ... "def f(arg:str='')->None: hey",
+ ... mode=black.Mode(
+ ... target_versions={black.TargetVersion.PY36},
+ ... line_length=10,
+ ... string_normalization=False,
+ ... is_pyi=False,
+ ... ),
+ ... ),
+ ... )
+ def f(
+ arg: str = '',
+ ) -> None:
+ hey
+
"""
src_node = lib2to3_parse(src_contents.lstrip(), mode.target_versions)
- dst_contents = ""
+ dst_contents = []
future_imports = get_future_imports(src_node)
if mode.target_versions:
versions = mode.target_versions
@@ -695,16 +792,14 @@ def format_str(src_contents: str, *, mode: FileMode) -> FileContent:
if supports_feature(versions, feature)
}
for current_line in lines.visit(src_node):
- for _ in range(after):
- dst_contents += str(empty_line)
+ dst_contents.append(str(empty_line) * after)
before, after = elt.maybe_empty_lines(current_line)
- for _ in range(before):
- dst_contents += str(empty_line)
+ dst_contents.append(str(empty_line) * before)
for line in split_line(
current_line, line_length=mode.line_length, features=split_line_features
):
- dst_contents += str(line)
- return dst_contents
+ dst_contents.append(str(line))
+ return "".join(dst_contents)
def decode_bytes(src: bytes) -> Tuple[FileContent, Encoding, NewLine]:
@@ -728,16 +823,39 @@ def get_grammars(target_versions: Set[TargetVersion]) -> List[Grammar]:
if not target_versions:
# No target_version specified, so try all grammars.
return [
+ # Python 3.7+
+ pygram.python_grammar_no_print_statement_no_exec_statement_async_keywords,
+ # Python 3.0-3.6
pygram.python_grammar_no_print_statement_no_exec_statement,
+ # Python 2.7 with future print_function import
pygram.python_grammar_no_print_statement,
+ # Python 2.7
pygram.python_grammar,
]
- elif all(version.is_python2() for version in target_versions):
+
+ if 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]
+ return [
+ # Python 2.7 with future print_function import
+ pygram.python_grammar_no_print_statement,
+ # Python 2.7
+ pygram.python_grammar,
+ ]
+
+ # Python 3-compatible code, so only try Python 3 grammar.
+ grammars = []
+ # If we have to parse both, try to parse async as a keyword first
+ if not supports_feature(target_versions, Feature.ASYNC_IDENTIFIERS):
+ # Python 3.7+
+ grammars.append(
+ pygram.python_grammar_no_print_statement_no_exec_statement_async_keywords
+ )
+ if not supports_feature(target_versions, Feature.ASYNC_KEYWORDS):
+ # Python 3.0-3.6
+ grammars.append(pygram.python_grammar_no_print_statement_no_exec_statement)
+ # At least one of the above branches must have been taken, because every Python
+ # version has exactly one of the two 'ASYNC_*' flags
+ return grammars
def lib2to3_parse(src_txt: str, target_versions: Iterable[TargetVersion] = ()) -> Node:
@@ -792,8 +910,16 @@ class Visitor(Generic[T]):
if node.type < 256:
name = token.tok_name[node.type]
else:
- name = type_repr(node.type)
- yield from getattr(self, f"visit_{name}", self.visit_default)(node)
+ name = str(type_repr(node.type))
+ # We explicitly branch on whether a visitor exists (instead of
+ # using self.visit_default as the default arg to getattr) in order
+ # to save needing to create a bound method object and so mypyc can
+ # generate a native call to visit_default.
+ visitf = getattr(self, f"visit_{name}", None)
+ if visitf:
+ yield from visitf(node)
+ else:
+ yield from self.visit_default(node)
def visit_default(self, node: LN) -> Iterator[T]:
"""Default `visit_*()` implementation. Recurses to children of `node`."""
@@ -838,8 +964,8 @@ class DebugVisitor(Visitor[T]):
list(v.visit(code))
-WHITESPACE = {token.DEDENT, token.INDENT, token.NEWLINE}
-STATEMENT = {
+WHITESPACE: Final = {token.DEDENT, token.INDENT, token.NEWLINE}
+STATEMENT: Final = {
syms.if_stmt,
syms.while_stmt,
syms.for_stmt,
@@ -849,10 +975,10 @@ STATEMENT = {
syms.funcdef,
syms.classdef,
}
-STANDALONE_COMMENT = 153
+STANDALONE_COMMENT: Final = 153
token.tok_name[STANDALONE_COMMENT] = "STANDALONE_COMMENT"
-LOGIC_OPERATORS = {"and", "or"}
-COMPARATORS = {
+LOGIC_OPERATORS: Final = {"and", "or"}
+COMPARATORS: Final = {
token.LESS,
token.GREATER,
token.EQEQUAL,
@@ -860,7 +986,7 @@ COMPARATORS = {
token.LESSEQUAL,
token.GREATEREQUAL,
}
-MATH_OPERATORS = {
+MATH_OPERATORS: Final = {
token.VBAR,
token.CIRCUMFLEX,
token.AMPER,
@@ -876,22 +1002,23 @@ MATH_OPERATORS = {
token.TILDE,
token.DOUBLESTAR,
}
-STARS = {token.STAR, token.DOUBLESTAR}
-VARARGS_PARENTS = {
+STARS: Final = {token.STAR, token.DOUBLESTAR}
+VARARGS_SPECIALS: Final = STARS | {token.SLASH}
+VARARGS_PARENTS: Final = {
syms.arglist,
syms.argument, # double star in arglist
syms.trailer, # single argument to call
syms.typedargslist,
syms.varargslist, # lambdas
}
-UNPACKING_PARENTS = {
+UNPACKING_PARENTS: Final = {
syms.atom, # single element of a list or set literal
syms.dictsetmaker,
syms.listmaker,
syms.testlist_gexp,
syms.testlist_star_expr,
}
-TEST_DESCENDANTS = {
+TEST_DESCENDANTS: Final = {
syms.test,
syms.lambdef,
syms.or_test,
@@ -908,7 +1035,7 @@ TEST_DESCENDANTS = {
syms.term,
syms.power,
}
-ASSIGNMENTS = {
+ASSIGNMENTS: Final = {
"=",
"+=",
"-=",
@@ -924,13 +1051,13 @@ ASSIGNMENTS = {
"**=",
"//=",
}
-COMPREHENSION_PRIORITY = 20
-COMMA_PRIORITY = 18
-TERNARY_PRIORITY = 16
-LOGIC_PRIORITY = 14
-STRING_PRIORITY = 12
-COMPARATOR_PRIORITY = 10
-MATH_PRIORITIES = {
+COMPREHENSION_PRIORITY: Final = 20
+COMMA_PRIORITY: Final = 18
+TERNARY_PRIORITY: Final = 16
+LOGIC_PRIORITY: Final = 14
+STRING_PRIORITY: Final = 12
+COMPARATOR_PRIORITY: Final = 10
+MATH_PRIORITIES: Final = {
token.VBAR: 9,
token.CIRCUMFLEX: 8,
token.AMPER: 7,
@@ -946,7 +1073,7 @@ MATH_PRIORITIES = {
token.TILDE: 3,
token.DOUBLESTAR: 2,
}
-DOT_PRIORITY = 1
+DOT_PRIORITY: Final = 1
@dataclass
@@ -954,11 +1081,11 @@ class BracketTracker:
"""Keeps track of brackets on a line."""
depth: int = 0
- bracket_match: Dict[Tuple[Depth, NodeType], Leaf] = Factory(dict)
- delimiters: Dict[LeafID, Priority] = Factory(dict)
+ bracket_match: Dict[Tuple[Depth, NodeType], Leaf] = field(default_factory=dict)
+ delimiters: Dict[LeafID, Priority] = field(default_factory=dict)
previous: Optional[Leaf] = None
- _for_loop_depths: List[int] = Factory(list)
- _lambda_argument_depths: List[int] = Factory(list)
+ _for_loop_depths: List[int] = field(default_factory=list)
+ _lambda_argument_depths: List[int] = field(default_factory=list)
def mark(self, leaf: Leaf) -> None:
"""Mark `leaf` with bracket-related metadata. Keep track of delimiters.
@@ -1004,7 +1131,7 @@ class BracketTracker:
"""Return True if there is an yet unmatched open bracket on the line."""
return bool(self.bracket_match)
- def max_delimiter_priority(self, exclude: Iterable[LeafID] = ()) -> int:
+ def max_delimiter_priority(self, exclude: Iterable[LeafID] = ()) -> Priority:
"""Return the highest priority of a delimiter found on the line.
Values are consistent with what `is_split_*_delimiter()` return.
@@ -1012,7 +1139,7 @@ class BracketTracker:
"""
return max(v for k, v in self.delimiters.items() if k not in exclude)
- def delimiter_count_with_priority(self, priority: int = 0) -> int:
+ def delimiter_count_with_priority(self, priority: Priority = 0) -> int:
"""Return the number of delimiters with the given `priority`.
If no `priority` is passed, defaults to max priority on the line.
@@ -1086,9 +1213,10 @@ class Line:
"""Holds leaves and comments. Can be printed with `str(line)`."""
depth: int = 0
- leaves: List[Leaf] = Factory(list)
- comments: Dict[LeafID, List[Leaf]] = Factory(dict) # keys ordered like `leaves`
- bracket_tracker: BracketTracker = Factory(BracketTracker)
+ leaves: List[Leaf] = field(default_factory=list)
+ # keys ordered like `leaves`
+ comments: Dict[LeafID, List[Leaf]] = field(default_factory=dict)
+ bracket_tracker: BracketTracker = field(default_factory=BracketTracker)
inside_brackets: bool = False
should_explode: bool = False
@@ -1168,6 +1296,69 @@ class Line:
Leaf(token.DOT, ".") for _ in range(3)
]
+ @property
+ def is_collection_with_optional_trailing_comma(self) -> bool:
+ """Is this line a collection literal with a trailing comma that's optional?
+
+ Note that the trailing comma in a 1-tuple is not optional.
+ """
+ if not self.leaves or len(self.leaves) < 4:
+ return False
+
+ # Look for and address a trailing colon.
+ if self.leaves[-1].type == token.COLON:
+ closer = self.leaves[-2]
+ close_index = -2
+ else:
+ closer = self.leaves[-1]
+ close_index = -1
+ if closer.type not in CLOSING_BRACKETS or self.inside_brackets:
+ return False
+
+ if closer.type == token.RPAR:
+ # Tuples require an extra check, because if there's only
+ # one element in the tuple removing the comma unmakes the
+ # tuple.
+ #
+ # We also check for parens before looking for the trailing
+ # comma because in some cases (eg assigning a dict
+ # literal) the literal gets wrapped in temporary parens
+ # during parsing. This case is covered by the
+ # collections.py test data.
+ opener = closer.opening_bracket
+ for _open_index, leaf in enumerate(self.leaves):
+ if leaf is opener:
+ break
+
+ else:
+ # Couldn't find the matching opening paren, play it safe.
+ return False
+
+ commas = 0
+ comma_depth = self.leaves[close_index - 1].bracket_depth
+ for leaf in self.leaves[_open_index + 1 : close_index]:
+ if leaf.bracket_depth == comma_depth and leaf.type == token.COMMA:
+ commas += 1
+ if commas > 1:
+ # We haven't looked yet for the trailing comma because
+ # we might also have caught noop parens.
+ return self.leaves[close_index - 1].type == token.COMMA
+
+ elif commas == 1:
+ return False # it's either a one-tuple or didn't have a trailing comma
+
+ if self.leaves[close_index - 1].type in CLOSING_BRACKETS:
+ close_index -= 1
+ closer = self.leaves[close_index]
+ if closer.type == token.RPAR:
+ # TODO: this is a gut feeling. Will we ever see this?
+ return False
+
+ if self.leaves[close_index - 1].type != token.COMMA:
+ return False
+
+ return True
+
@property
def is_def(self) -> bool:
"""Is this a function definition? (Also returns True for async defs.)"""
@@ -1215,95 +1406,117 @@ class Line:
def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool:
"""If so, needs to be split before emitting."""
for leaf in self.leaves:
- if leaf.type == STANDALONE_COMMENT:
- if leaf.bracket_depth <= depth_limit:
- return True
+ if leaf.type == STANDALONE_COMMENT and leaf.bracket_depth <= depth_limit:
+ return True
+
return False
- def contains_inner_type_comments(self) -> bool:
+ def contains_uncollapsable_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.
+ if last_leaf.type == token.COMMA or (
+ last_leaf.type == token.RPAR and not last_leaf.value
+ ):
+ # When trailing commas or optional parens 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 and invisible.
last_leaf = self.leaves[-2]
ignored_ids.add(id(last_leaf))
except IndexError:
return False
+ # A type comment is uncollapsable if it is attached to a leaf
+ # that isn't at the end of the line (since that could cause it
+ # to get associated to a different argument) or if there are
+ # comments before it (since that could cause it to get hidden
+ # behind a comment.
+ comment_seen = 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
+ if comment_seen or (
+ not is_type_comment(comment, " ignore")
+ and leaf_id not in ignored_ids
+ ):
+ return True
+
+ comment_seen = True
return False
- def contains_multiline_strings(self) -> bool:
- for leaf in self.leaves:
- if is_multiline_string(leaf):
- return True
+ def contains_unsplittable_type_ignore(self) -> bool:
+ if not self.leaves:
+ return False
+
+ # If a 'type: ignore' is attached to the end of a line, we
+ # can't split the line, because we can't know which of the
+ # subexpressions the ignore was meant to apply to.
+ #
+ # We only want this to apply to actual physical lines from the
+ # original source, though: we don't want the presence of a
+ # 'type: ignore' at the end of a multiline expression to
+ # justify pushing it all onto one line. Thus we
+ # (unfortunately) need to check the actual source lines and
+ # only report an unsplittable 'type: ignore' if this line was
+ # one line in the original code.
+
+ # Grab the first and last line numbers, skipping generated leaves
+ first_line = next((l.lineno for l in self.leaves if l.lineno != 0), 0)
+ last_line = next((l.lineno for l in reversed(self.leaves) if l.lineno != 0), 0)
+
+ if first_line == last_line:
+ # We look at the last two leaves since a comma or an
+ # invisible paren could have been added at the end of the
+ # line.
+ for node in self.leaves[-2:]:
+ for comment in self.comments.get(id(node), []):
+ if is_type_comment(comment, " ignore"):
+ return True
return False
+ def contains_multiline_strings(self) -> bool:
+ return any(is_multiline_string(leaf) for leaf in self.leaves)
+
def maybe_remove_trailing_comma(self, closing: Leaf) -> bool:
"""Remove trailing comma if there is one and it's safe."""
+ if not (self.leaves and self.leaves[-1].type == token.COMMA):
+ return False
+
+ # We remove trailing commas only in the case of importing a
+ # single name from a module.
if not (
self.leaves
+ and self.is_import
+ and len(self.leaves) > 4
and self.leaves[-1].type == token.COMMA
and closing.type in CLOSING_BRACKETS
+ and self.leaves[-4].type == token.NAME
+ and (
+ # regular `from foo import bar,`
+ self.leaves[-4].value == "import"
+ # `from foo import (bar as baz,)
+ or (
+ len(self.leaves) > 6
+ and self.leaves[-6].value == "import"
+ and self.leaves[-3].value == "as"
+ )
+ # `from foo import bar as baz,`
+ or (
+ len(self.leaves) > 5
+ and self.leaves[-5].value == "import"
+ and self.leaves[-3].value == "as"
+ )
+ )
+ and closing.type == token.RPAR
):
return False
- if closing.type == token.RBRACE:
- self.remove_trailing_comma()
- return True
-
- if closing.type == token.RSQB:
- comma = self.leaves[-1]
- if comma.parent and comma.parent.type == syms.listmaker:
- self.remove_trailing_comma()
- return True
-
- # For parens let's check if it's safe to remove the comma.
- # Imports are always safe.
- if self.is_import:
- self.remove_trailing_comma()
- return True
-
- # 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
- opening = closing.opening_bracket
- for _opening_index, leaf in enumerate(self.leaves):
- if leaf is opening:
- break
-
- else:
- return False
-
- for leaf in self.leaves[_opening_index + 1 :]:
- if leaf is closing:
- break
-
- bracket_depth = leaf.bracket_depth
- if bracket_depth == depth and leaf.type == token.COMMA:
- commas += 1
- if leaf.parent and leaf.parent.type == syms.arglist:
- commas += 1
- break
-
- if commas > 1:
- self.remove_trailing_comma()
- return True
-
- return False
+ self.remove_trailing_comma()
+ return True
def append_comment(self, comment: Leaf) -> bool:
"""Add an inline or standalone comment to the line."""
@@ -1322,7 +1535,24 @@ class Line:
comment.prefix = ""
return False
- self.comments.setdefault(id(self.leaves[-1]), []).append(comment)
+ last_leaf = self.leaves[-1]
+ if (
+ last_leaf.type == token.RPAR
+ and not last_leaf.value
+ and last_leaf.parent
+ and len(list(last_leaf.parent.leaves())) <= 3
+ and not is_type_comment(comment)
+ ):
+ # Comments on an optional parens wrapping a single leaf should belong to
+ # the wrapped node except if it's a type comment. Pinning the comment like
+ # this avoids unstable formatting caused by comment migration.
+ if len(self.leaves) < 2:
+ comment.type = STANDALONE_COMMENT
+ comment.prefix = ""
+ return False
+
+ last_leaf = self.leaves[-2]
+ self.comments.setdefault(id(last_leaf), []).append(comment)
return True
def comments_after(self, leaf: Leaf) -> List[Leaf]:
@@ -1388,7 +1618,7 @@ class EmptyLineTracker:
is_pyi: bool = False
previous_line: Optional[Line] = None
previous_after: int = 0
- previous_defs: List[int] = Factory(list)
+ previous_defs: List[int] = field(default_factory=list)
def maybe_empty_lines(self, current_line: Line) -> Tuple[int, int]:
"""Return the number of extra empty lines before and after the `current_line`.
@@ -1397,7 +1627,13 @@ class EmptyLineTracker:
lines (two on module-level).
"""
before, after = self._maybe_empty_lines(current_line)
- before -= self.previous_after
+ before = (
+ # Black should not insert empty lines at the beginning
+ # of the file
+ 0
+ if self.previous_line is None
+ else before - self.previous_after
+ )
self.previous_after = after
self.previous_line = current_line
return before, after
@@ -1496,7 +1732,7 @@ class LineGenerator(Visitor[Line]):
is_pyi: bool = False
normalize_strings: bool = True
- current_line: Line = Factory(Line)
+ current_line: Line = field(default_factory=Line)
remove_u_prefix: bool = False
def line(self, indent: int = 0) -> Iterator[Line]:
@@ -1545,13 +1781,13 @@ class LineGenerator(Visitor[Line]):
self.current_line.append(node)
yield from super().visit_default(node)
- def visit_INDENT(self, node: Node) -> Iterator[Line]:
+ def visit_INDENT(self, node: Leaf) -> Iterator[Line]:
"""Increase indentation level, maybe yield a line."""
# In blib2to3 INDENT never holds comments.
yield from self.line(+1)
yield from self.visit_default(node)
- def visit_DEDENT(self, node: Node) -> Iterator[Line]:
+ def visit_DEDENT(self, node: Leaf) -> Iterator[Line]:
"""Decrease indentation level, maybe yield a line."""
# The current line might still wait for trailing comments. At DEDENT time
# there won't be any (they would be prefixes on the preceding NEWLINE).
@@ -1644,7 +1880,24 @@ class LineGenerator(Visitor[Line]):
yield from self.line()
yield from self.visit_default(leaf)
- def __attrs_post_init__(self) -> None:
+ def visit_factor(self, node: Node) -> Iterator[Line]:
+ """Force parentheses between a unary op and a binary power:
+
+ -2 ** 8 -> -(2 ** 8)
+ """
+ _operator, operand = node.children
+ if (
+ operand.type == syms.power
+ and len(operand.children) == 3
+ and operand.children[1].type == token.DOUBLESTAR
+ ):
+ lpar = Leaf(token.LPAR, "(")
+ rpar = Leaf(token.RPAR, ")")
+ index = operand.remove() or 0
+ node.insert_child(index, Node(syms.atom, [lpar, operand, rpar]))
+ yield from self.visit_default(node)
+
+ def __post_init__(self) -> None:
"""You are in a twisty little maze of passages."""
v = self.visit_stmt
Ã: Set[str] = set()
@@ -1734,7 +1987,7 @@ def whitespace(leaf: Leaf, *, complex_subscript: bool) -> str: # noqa: C901
# that, too.
return prevp.prefix
- elif prevp.type in STARS:
+ elif prevp.type in VARARGS_SPECIALS:
if is_vararg(prevp, within=VARARGS_PARENTS | UNPACKING_PARENTS):
return NO
@@ -1824,7 +2077,7 @@ def whitespace(leaf: Leaf, *, complex_subscript: bool) -> str: # noqa: C901
if not prevp or prevp.type == token.LPAR:
return NO
- elif prev.type in {token.EQUAL} | STARS:
+ elif prev.type in {token.EQUAL} | VARARGS_SPECIALS:
return NO
elif p.type == syms.decorator:
@@ -1958,7 +2211,7 @@ def container_of(leaf: Leaf) -> LN:
return container
-def is_split_after_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> int:
+def is_split_after_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> Priority:
"""Return the priority of the `leaf` delimiter, given a line break after it.
The delimiter priorities returned here are from those delimiters that would
@@ -1972,7 +2225,7 @@ def is_split_after_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> int
return 0
-def is_split_before_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> int:
+def is_split_before_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> Priority:
"""Return the priority of the `leaf` delimiter, given a line break before it.
The delimiter priorities returned here are from those delimiters that would
@@ -2122,15 +2375,21 @@ def list_comments(prefix: str, *, is_endmarker: bool) -> List[ProtoComment]:
consumed = 0
nlines = 0
+ ignored_lines = 0
for index, line in enumerate(prefix.split("\n")):
consumed += len(line) + 1 # adding the length of the split '\n'
line = line.lstrip()
if not line:
nlines += 1
if not line.startswith("#"):
+ # Escaped newlines outside of a comment are not really newlines at
+ # all. We treat a single-line comment following an escaped newline
+ # as a simple trailing comment.
+ if line.endswith("\\"):
+ ignored_lines += 1
continue
- if index == 0 and not is_endmarker:
+ if index == ignored_lines and not is_endmarker:
comment_type = token.COMMENT # simple trailing comment
else:
comment_type = STANDALONE_COMMENT
@@ -2185,9 +2444,13 @@ def split_line(
line_str = str(line).strip("\n")
if (
- not line.contains_inner_type_comments()
+ not line.contains_uncollapsable_type_comments()
and not line.should_explode
- and is_line_short_enough(line, line_length=line_length, line_str=line_str)
+ and not line.is_collection_with_optional_trailing_comma
+ and (
+ is_line_short_enough(line, line_length=line_length, line_str=line_str)
+ or line.contains_unsplittable_type_ignore()
+ )
):
yield line
return
@@ -2207,7 +2470,9 @@ 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, line_length, features=features)
+ # line_length=1 here was historically a bug that somehow became a feature.
+ # See #762 and #781 for the full story.
+ yield from right_hand_split(line, line_length=1, features=features)
if line.inside_brackets:
split_funcs = [delimiter_split, standalone_comment_split, rhs]
@@ -2250,7 +2515,7 @@ def left_hand_split(line: Line, features: Collection[Feature] = ()) -> Iterator[
body_leaves: List[Leaf] = []
head_leaves: List[Leaf] = []
current_leaves = head_leaves
- matching_bracket = None
+ matching_bracket: Optional[Leaf] = None
for leaf in line.leaves:
if (
current_leaves is body_leaves
@@ -2293,8 +2558,8 @@ def right_hand_split(
body_leaves: List[Leaf] = []
head_leaves: List[Leaf] = []
current_leaves = tail_leaves
- opening_bracket = None
- closing_bracket = None
+ opening_bracket: Optional[Leaf] = None
+ closing_bracket: Optional[Leaf] = None
for leaf in reversed(line.leaves):
if current_leaves is body_leaves:
if leaf is opening_bracket:
@@ -2405,10 +2670,23 @@ def bracket_split_build_line(
if leaves:
# Since body is a new indent level, remove spurious leading whitespace.
normalize_prefix(leaves[0], inside_brackets=True)
- # Ensure a trailing comma when expected.
- if original.is_import:
- if leaves[-1].type != token.COMMA:
- leaves.append(Leaf(token.COMMA, ","))
+ # Ensure a trailing comma for imports and standalone function arguments, but
+ # be careful not to add one after any comments or within type annotations.
+ no_commas = (
+ original.is_def
+ and opening_bracket.value == "("
+ and not any(l.type == token.COMMA for l in leaves)
+ )
+
+ if original.is_import or no_commas:
+ for i in range(len(leaves) - 1, -1, -1):
+ if leaves[i].type == STANDALONE_COMMENT:
+ continue
+
+ if leaves[i].type != token.COMMA:
+ leaves.insert(i + 1, Leaf(token.COMMA, ","))
+ break
+
# Populate the line
for leaf in leaves:
result.append(leaf, preformatted=True)
@@ -2549,12 +2827,12 @@ def is_import(leaf: Leaf) -> bool:
)
-def is_type_comment(leaf: Leaf) -> bool:
+def is_type_comment(leaf: Leaf, suffix: str = "") -> 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:")
+ return t in {token.COMMENT, STANDALONE_COMMENT} and v.startswith("# type:" + suffix)
def normalize_prefix(leaf: Leaf, *, inside_brackets: bool) -> None:
@@ -2585,7 +2863,7 @@ def normalize_string_prefix(leaf: Leaf, remove_u_prefix: bool = False) -> None:
match = re.match(r"^([furbFURB]*)(.*)$", leaf.value, re.DOTALL)
assert match is not None, f"failed to match string {leaf.value!r}"
orig_prefix = match.group(1)
- new_prefix = orig_prefix.lower()
+ new_prefix = orig_prefix.replace("F", "f").replace("B", "b").replace("U", "u")
if remove_u_prefix:
new_prefix = new_prefix.replace("u", "")
leaf.value = f"{new_prefix}{match.group(2)}"
@@ -2639,11 +2917,20 @@ def normalize_string_quotes(leaf: Leaf) -> None:
new_body = sub_twice(escaped_orig_quote, rf"\1\2{orig_quote}", new_body)
new_body = sub_twice(unescaped_new_quote, rf"\1\\{new_quote}", new_body)
if "f" in prefix.casefold():
- matches = re.findall(r"[^{]\{(.*?)\}[^}]", new_body)
+ matches = re.findall(
+ r"""
+ (?:[^{]|^)\{ # start of the string or a non-{ followed by a single {
+ ([^{].*?) # contents of the brackets except if begins with {{
+ \}(?:[^}]|$) # A } followed by end of the string or a non-}
+ """,
+ new_body,
+ re.VERBOSE,
+ )
for m in matches:
if "\\" in str(m):
# Do not introduce backslashes in interpolated expressions
return
+
if new_quote == '"""' and new_body[-1:] == '"':
# edge case:
new_body = new_body[:-1] + '\\"'
@@ -2706,7 +2993,7 @@ def format_float_or_int_string(text: str) -> str:
def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
"""Make existing optional parentheses invisible or create new ones.
- `parens_after` is a set of string leaf values immeditely after which parens
+ `parens_after` is a set of string leaf values immediately after which parens
should be put.
Standardizes on visible parentheses for single-element tuples, and keeps
@@ -2716,22 +3003,25 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
if pc.value in FMT_OFF:
# This `node` has a prefix with `# fmt: off`, don't mess with parens.
return
-
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 is_walrus_assignment(child):
+ continue
+
if child.type == syms.atom:
- if maybe_make_parens_invisible_in_atom(child):
- lpar = Leaf(token.LPAR, "")
- rpar = Leaf(token.RPAR, "")
- index = child.remove() or 0
- node.insert_child(index, Node(syms.atom, [lpar, child, rpar]))
+ if maybe_make_parens_invisible_in_atom(child, parent=node):
+ wrap_in_parentheses(node, child, visible=False)
elif is_one_tuple(child):
- # wrap child in visible parentheses
- lpar = Leaf(token.LPAR, "(")
- rpar = Leaf(token.RPAR, ")")
- child.remove()
- node.insert_child(index, Node(syms.atom, [lpar, child, rpar]))
+ wrap_in_parentheses(node, child, visible=True)
elif node.type == syms.import_from:
# "import from" nodes store parentheses directly as part of
# the statement
@@ -2746,11 +3036,7 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
break
elif not (isinstance(child, Leaf) and is_multiline_string(child)):
- # wrap child in invisible parentheses
- lpar = Leaf(token.LPAR, "")
- rpar = Leaf(token.RPAR, "")
- index = child.remove() or 0
- node.insert_child(index, Node(syms.atom, [lpar, child, rpar]))
+ wrap_in_parentheses(node, child, visible=False)
check_lpar = isinstance(child, Leaf) and child.value in parens_after
@@ -2794,7 +3080,7 @@ def convert_one_fmt_off_pair(node: Node) -> bool:
# 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
+ first_idx: Optional[int] = None
for ignored in ignored_nodes:
index = ignored.remove()
if first_idx is None:
@@ -2823,17 +3109,24 @@ def generate_ignored_nodes(leaf: Leaf) -> Iterator[LN]:
"""
container: Optional[LN] = container_of(leaf)
while container is not None and container.type != token.ENDMARKER:
+ is_fmt_on = False
for comment in list_comments(container.prefix, is_endmarker=False):
if comment.value in FMT_ON:
- return
+ is_fmt_on = True
+ elif comment.value in FMT_OFF:
+ is_fmt_on = False
+ if is_fmt_on:
+ return
yield container
container = container.next_sibling
-def maybe_make_parens_invisible_in_atom(node: LN) -> bool:
+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.
+ Additionally, remove repeated, adjacent invisible parens from the atom `node`
+ as they are redundant.
Returns whether the node should itself be wrapped in invisible parentheses.
@@ -2842,7 +3135,7 @@ def maybe_make_parens_invisible_in_atom(node: LN) -> bool:
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
@@ -2850,16 +3143,40 @@ def maybe_make_parens_invisible_in_atom(node: LN) -> bool:
first = node.children[0]
last = node.children[-1]
if first.type == token.LPAR and last.type == token.RPAR:
+ middle = node.children[1]
# make parentheses invisible
first.value = "" # type: ignore
last.value = "" # type: ignore
- if len(node.children) > 1:
- maybe_make_parens_invisible_in_atom(node.children[1])
+ maybe_make_parens_invisible_in_atom(middle, parent=parent)
+
+ if is_atom_with_invisible_parens(middle):
+ # Strip the invisible parens from `middle` by replacing
+ # it with the child in-between the invisible parens
+ middle.replace(middle.children[1])
+
return False
return True
+def is_atom_with_invisible_parens(node: LN) -> bool:
+ """Given a `LN`, determines whether it's an atom `node` with invisible
+ parens. Useful in dedupe-ing and normalizing parens.
+ """
+ if isinstance(node, Leaf) or node.type != syms.atom:
+ return False
+
+ first, last = node.children[0], node.children[-1]
+ return (
+ isinstance(first, Leaf)
+ and first.type == token.LPAR
+ and first.value == ""
+ and isinstance(last, Leaf)
+ and last.type == token.RPAR
+ and last.value == ""
+ )
+
+
def is_empty_tuple(node: LN) -> bool:
"""Return True if `node` holds an empty tuple."""
return (
@@ -2870,18 +3187,43 @@ def is_empty_tuple(node: LN) -> bool:
)
+def unwrap_singleton_parenthesis(node: LN) -> Optional[LN]:
+ """Returns `wrapped` if `node` is of the shape ( wrapped ).
+
+ Parenthesis can be optional. Returns None otherwise"""
+ if len(node.children) != 3:
+ return None
+
+ lpar, wrapped, rpar = node.children
+ if not (lpar.type == token.LPAR and rpar.type == token.RPAR):
+ return None
+
+ return wrapped
+
+
+def wrap_in_parentheses(parent: Node, child: LN, *, visible: bool = True) -> None:
+ """Wrap `child` in parentheses.
+
+ This replaces `child` with an atom holding the parentheses and the old
+ child. That requires moving the prefix.
+
+ If `visible` is False, the leaves will be valueless (and thus invisible).
+ """
+ lpar = Leaf(token.LPAR, "(" if visible else "")
+ rpar = Leaf(token.RPAR, ")" if visible else "")
+ prefix = child.prefix
+ child.prefix = ""
+ index = child.remove() or 0
+ new_child = Node(syms.atom, [lpar, child, rpar])
+ new_child.prefix = prefix
+ parent.insert_child(index, new_child)
+
+
def is_one_tuple(node: LN) -> bool:
"""Return True if `node` holds a tuple with one element, with or without parens."""
if node.type == syms.atom:
- if len(node.children) != 3:
- return False
-
- lpar, gexp, rpar = node.children
- if not (
- lpar.type == token.LPAR
- and gexp.type == syms.testlist_gexp
- and rpar.type == token.RPAR
- ):
+ gexp = unwrap_singleton_parenthesis(node)
+ if gexp is None or gexp.type != syms.testlist_gexp:
return False
return len(gexp.children) == 2 and gexp.children[1].type == token.COMMA
@@ -2893,6 +3235,12 @@ def is_one_tuple(node: LN) -> bool:
)
+def is_walrus_assignment(node: LN) -> bool:
+ """Return True iff `node` is of the shape ( test := test )"""
+ inner = unwrap_singleton_parenthesis(node)
+ return inner is not None and inner.type == syms.namedexpr_test
+
+
def is_yield(node: LN) -> bool:
"""Return True if `node` holds a `yield` or `yield from` expression."""
if node.type == syms.yield_expr:
@@ -2922,7 +3270,7 @@ def is_vararg(leaf: Leaf, within: Set[NodeType]) -> bool:
extended iterable unpacking (PEP 3132) and additional unpacking
generalizations (PEP 448).
"""
- if leaf.type not in STARS or not leaf.parent:
+ if leaf.type not in VARARGS_SPECIALS or not leaf.parent:
return False
p = leaf.parent
@@ -2972,7 +3320,7 @@ def is_stub_body(node: LN) -> bool:
)
-def max_delimiter_priority_in_atom(node: LN) -> int:
+def max_delimiter_priority_in_atom(node: LN) -> Priority:
"""Return maximum delimiter priority inside `node`.
This is specific to atoms with contents contained in a pair of parentheses.
@@ -3004,7 +3352,7 @@ def ensure_visible(leaf: Leaf) -> None:
"""Make sure parentheses are visible.
They could be invisible as part of some statements (see
- :func:`normalize_invible_parens` and :func:`visit_import_from`).
+ :func:`normalize_invisible_parens` and :func:`visit_import_from`).
"""
if leaf.type == token.LPAR:
leaf.value = "("
@@ -3037,8 +3385,9 @@ def get_features_used(node: Node) -> Set[Feature]:
Currently looking for:
- f-strings;
- - underscores in numeric literals; and
- - trailing commas after * or ** in function signatures and calls.
+ - underscores in numeric literals;
+ - trailing commas after * or ** in function signatures and calls;
+ - positional only arguments in function signatures and lambdas;
"""
features: Set[Feature] = set()
for n in node.pre_order():
@@ -3051,6 +3400,13 @@ def get_features_used(node: Node) -> Set[Feature]:
if "_" in n.value: # type: ignore
features.add(Feature.NUMERIC_UNDERSCORES)
+ elif n.type == token.SLASH:
+ if n.parent and n.parent.type in {syms.typedargslist, syms.arglist}:
+ features.add(Feature.POS_ONLY_ARGUMENTS)
+
+ elif n.type == token.COLONEQUAL:
+ features.add(Feature.ASSIGNMENT_EXPRESSIONS)
+
elif (
n.type in {syms.typedargslist, syms.arglist}
and n.children
@@ -3095,8 +3451,8 @@ def generate_trailers_to_omit(line: Line, line_length: int) -> Iterator[Set[Leaf
yield omit
length = 4 * line.depth
- opening_bracket = None
- closing_bracket = None
+ opening_bracket: Optional[Leaf] = None
+ closing_bracket: Optional[Leaf] = None
inner_brackets: Set[LeafID] = set()
for index, leaf, leaf_length in enumerate_with_length(line, reversed=True):
length += leaf_length
@@ -3140,19 +3496,23 @@ def get_future_imports(node: Node) -> Set[str]:
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
+
first_child = child.children[0]
if isinstance(first_child, Leaf):
# Continue looking if we see a docstring; otherwise stop.
@@ -3162,24 +3522,39 @@ def get_future_imports(node: Node) -> Set[str]:
and child.children[1].type == token.NEWLINE
):
continue
- else:
- break
+
+ break
+
elif first_child.type == syms.import_from:
module_name = first_child.children[1]
if not isinstance(module_name, Leaf) or module_name.value != "__future__":
break
+
imports |= set(get_imports_from_children(first_child.children[3:]))
else:
break
+
return imports
+@lru_cache()
+def get_gitignore(root: Path) -> PathSpec:
+ """ Return a PathSpec matching gitignore content if present."""
+ gitignore = root / ".gitignore"
+ lines: List[str] = []
+ if gitignore.is_file():
+ with gitignore.open() as gf:
+ lines = gf.readlines()
+ return PathSpec.from_lines("gitwildmatch", lines)
+
+
def gen_python_files_in_dir(
path: Path,
root: Path,
include: Pattern[str],
exclude: Pattern[str],
report: "Report",
+ gitignore: PathSpec,
) -> Iterator[Path]:
"""Generate all files under `path` whose paths are not excluded by the
`exclude` regex, but are included by the `include` regex.
@@ -3190,8 +3565,18 @@ def gen_python_files_in_dir(
"""
assert root.is_absolute(), f"INTERNAL ERROR: `root` must be absolute but is {root}"
for child in path.iterdir():
+ # First ignore files matching .gitignore
+ if gitignore.match_file(child.as_posix()):
+ report.path_ignored(child, f"matches the .gitignore file content")
+ continue
+
+ # Then ignore with `exclude` option.
try:
normalized_path = "/" + child.resolve().relative_to(root).as_posix()
+ except OSError as e:
+ report.path_ignored(child, f"cannot be read because {e}")
+ continue
+
except ValueError:
if child.is_symlink():
report.path_ignored(
@@ -3203,13 +3588,16 @@ def gen_python_files_in_dir(
if child.is_dir():
normalized_path += "/"
+
exclude_match = exclude.search(normalized_path)
if exclude_match and exclude_match.group(0):
report.path_ignored(child, f"matches the --exclude regular expression")
continue
if child.is_dir():
- yield from gen_python_files_in_dir(child, root, include, exclude, report)
+ yield from gen_python_files_in_dir(
+ child, root, include, exclude, report, gitignore
+ )
elif child.is_file():
include_match = include.search(normalized_path)
@@ -3235,7 +3623,7 @@ def find_project_root(srcs: Iterable[str]) -> Path:
# Append a fake file so `parents` below returns `common_base_dir`, too.
common_base /= "fake-file"
for directory in common_base.parents:
- if (directory / ".git").is_dir():
+ if (directory / ".git").exists():
return directory
if (directory / ".hg").is_dir():
@@ -3252,6 +3640,7 @@ class Report:
"""Provides a reformatting counter. Can be rendered with `str(report)`."""
check: bool = False
+ diff: bool = False
quiet: bool = False
verbose: bool = False
change_count: int = 0
@@ -3261,7 +3650,7 @@ class Report:
def done(self, src: Path, changed: Changed) -> None:
"""Increment the counter for successful reformatting. Write out a message."""
if changed is Changed.YES:
- reformatted = "would reformat" if self.check else "reformatted"
+ reformatted = "would reformat" if self.check or self.diff else "reformatted"
if self.verbose or not self.quiet:
out(f"{reformatted} {src}")
self.change_count += 1
@@ -3307,7 +3696,7 @@ class Report:
Use `click.unstyle` to remove colors.
"""
- if self.check:
+ if self.check or self.diff:
reformatted = "would be reformatted"
unchanged = "would be left unchanged"
failed = "would fail to reformat"
@@ -3332,17 +3721,59 @@ class Report:
return ", ".join(report) + "."
+def parse_ast(src: str) -> Union[ast.AST, ast3.AST, ast27.AST]:
+ filename = "<unknown>"
+ if sys.version_info >= (3, 8):
+ # TODO: support Python 4+ ;)
+ for minor_version in range(sys.version_info[1], 4, -1):
+ try:
+ return ast.parse(src, filename, feature_version=(3, minor_version))
+ except SyntaxError:
+ continue
+ else:
+ for feature_version in (7, 6):
+ try:
+ return ast3.parse(src, filename, feature_version=feature_version)
+ except SyntaxError:
+ continue
+
+ return ast27.parse(src)
+
+
+def _fixup_ast_constants(
+ node: Union[ast.AST, ast3.AST, ast27.AST]
+) -> Union[ast.AST, ast3.AST, ast27.AST]:
+ """Map ast nodes deprecated in 3.8 to Constant."""
+ if isinstance(node, (ast.Str, ast3.Str, ast27.Str, ast.Bytes, ast3.Bytes)):
+ return ast.Constant(value=node.s)
+
+ if isinstance(node, (ast.Num, ast3.Num, ast27.Num)):
+ return ast.Constant(value=node.n)
+
+ if isinstance(node, (ast.NameConstant, ast3.NameConstant)):
+ return ast.Constant(value=node.value)
+
+ return node
+
+
def assert_equivalent(src: str, dst: str) -> None:
"""Raise AssertionError if `src` and `dst` aren't equivalent."""
- import ast
- import traceback
-
- def _v(node: ast.AST, depth: int = 0) -> Iterator[str]:
+ def _v(node: Union[ast.AST, ast3.AST, ast27.AST], depth: int = 0) -> Iterator[str]:
"""Simple visitor generating strings to compare ASTs by content."""
+
+ node = _fixup_ast_constants(node)
+
yield f"{' ' * depth}{node.__class__.__name__}("
- for field in sorted(node._fields):
+ for field in sorted(node._fields): # noqa: F402
+ # TypeIgnore has only one field 'lineno' which breaks this comparison
+ type_ignore_classes = (ast3.TypeIgnore, ast27.TypeIgnore)
+ if sys.version_info >= (3, 8):
+ type_ignore_classes += (ast.TypeIgnore,)
+ if isinstance(node, type_ignore_classes):
+ break
+
try:
value = getattr(node, field)
except AttributeError:
@@ -3356,15 +3787,16 @@ def assert_equivalent(src: str, dst: str) -> None:
# parentheses and they change the AST.
if (
field == "targets"
- and isinstance(node, ast.Delete)
- and isinstance(item, ast.Tuple)
+ and isinstance(node, (ast.Delete, ast3.Delete, ast27.Delete))
+ and isinstance(item, (ast.Tuple, ast3.Tuple, ast27.Tuple))
):
for item in item.elts:
yield from _v(item, depth + 2)
- elif isinstance(item, ast.AST):
+
+ elif isinstance(item, (ast.AST, ast3.AST, ast27.AST)):
yield from _v(item, depth + 2)
- elif isinstance(value, ast.AST):
+ elif isinstance(value, (ast.AST, ast3.AST, ast27.AST)):
yield from _v(value, depth + 2)
else:
@@ -3373,22 +3805,20 @@ def assert_equivalent(src: str, dst: str) -> None:
yield f"{' ' * depth}) # /{node.__class__.__name__}"
try:
- src_ast = ast.parse(src)
+ src_ast = parse_ast(src)
except Exception as exc:
- major, minor = sys.version_info[:2]
raise AssertionError(
- f"cannot use --safe with this file; failed to parse source file "
- f"with Python {major}.{minor}'s builtin AST. Re-run with --fast "
- f"or stop using deprecated Python 2 syntax. AST error message: {exc}"
+ f"cannot use --safe with this file; failed to parse source file. "
+ f"AST error message: {exc}"
)
try:
- dst_ast = ast.parse(dst)
+ dst_ast = parse_ast(dst)
except Exception as exc:
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/python/black/issues. "
+ f"Please report a bug on https://github.com/psf/black/issues. "
f"This invalid output might be helpful: {log}"
) from None
@@ -3399,12 +3829,12 @@ 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/python/black/issues. "
+ f"Please report a bug on https://github.com/psf/black/issues. "
f"This diff might be helpful: {log}"
) from None
-def assert_stable(src: str, dst: str, mode: FileMode) -> None:
+def assert_stable(src: str, dst: str, mode: Mode) -> None:
"""Raise AssertionError if `dst` reformats differently the second time."""
newdst = format_str(dst, mode=mode)
if dst != newdst:
@@ -3415,15 +3845,14 @@ def assert_stable(src: str, dst: str, mode: FileMode) -> None:
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/python/black/issues. "
+ f"Please report a bug on https://github.com/psf/black/issues. "
f"This diff might be helpful: {log}"
) from None
+@mypyc_attr(patchable=True)
def dump_to_file(*output: str) -> str:
"""Dump `output` to a temporary file. Return path to the file."""
- import tempfile
-
with tempfile.NamedTemporaryFile(
mode="w", prefix="blk_", suffix=".log", delete=False, encoding="utf8"
) as f:
@@ -3434,6 +3863,15 @@ def dump_to_file(*output: str) -> str:
return f.name
+@contextmanager
+def nullcontext() -> Iterator[None]:
+ """Return an empty context manager.
+
+ To be used like `nullcontext` in Python 3.7.
+ """
+ yield
+
+
def diff(a: str, b: str, a_name: str, b_name: str) -> str:
"""Return a unified diff string between strings `a` and `b`."""
import difflib
@@ -3445,14 +3883,14 @@ def diff(a: str, b: str, a_name: str, b_name: str) -> str:
)
-def cancel(tasks: Iterable[asyncio.Task]) -> None:
+def cancel(tasks: Iterable["asyncio.Task[Any]"]) -> None:
"""asyncio signal handler that cancels all `tasks` and reports to stderr."""
err("Aborted!")
for task in tasks:
task.cancel()
-def shutdown(loop: BaseEventLoop) -> None:
+def shutdown(loop: asyncio.AbstractEventLoop) -> None:
"""Cancel all pending tasks on `loop`, wait for them, and close the loop."""
try:
if sys.version_info[:2] >= (3, 7):
@@ -3494,7 +3932,8 @@ def re_compile_maybe_verbose(regex: str) -> Pattern[str]:
"""
if "\n" in regex:
regex = "(?x)" + regex
- return re.compile(regex)
+ compiled: Pattern[str] = re.compile(regex)
+ return compiled
def enumerate_reversed(sequence: Sequence[T]) -> Iterator[Tuple[Index, T]]:
@@ -3521,7 +3960,6 @@ def enumerate_with_length(
if "\n" in leaf.value:
return # Multiline strings, we can't continue.
- comment: Optional[Leaf]
for comment in line.comments_after(leaf):
length += len(comment.value)
@@ -3667,11 +4105,11 @@ def can_omit_invisible_parens(line: Line, line_length: int) -> bool:
return False
-def get_cache_file(mode: FileMode) -> Path:
+def get_cache_file(mode: Mode) -> Path:
return CACHE_DIR / f"cache.{mode.get_cache_key()}.pickle"
-def read_cache(mode: FileMode) -> Cache:
+def read_cache(mode: Mode) -> 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.
@@ -3683,7 +4121,7 @@ def read_cache(mode: FileMode) -> Cache:
with cache_file.open("rb") as fobj:
try:
cache: Cache = pickle.load(fobj)
- except pickle.UnpicklingError:
+ except (pickle.UnpicklingError, ValueError):
return {}
return cache
@@ -3711,14 +4149,14 @@ def filter_cached(cache: Cache, sources: Iterable[Path]) -> Tuple[Set[Path], Set
return todo, done
-def write_cache(cache: Cache, sources: Iterable[Path], mode: FileMode) -> None:
+def write_cache(cache: Cache, sources: Iterable[Path], mode: Mode) -> None:
"""Update the cache file."""
cache_file = get_cache_file(mode)
try:
CACHE_DIR.mkdir(parents=True, exist_ok=True)
new_cache = {**cache, **{src.resolve(): get_cache_info(src) for src in sources}}
with tempfile.NamedTemporaryFile(dir=str(cache_file.parent), delete=False) as f:
- pickle.dump(new_cache, f, protocol=pickle.HIGHEST_PROTOCOL)
+ pickle.dump(new_cache, f, protocol=4)
os.replace(f.name, cache_file)
except OSError:
pass