import os
from pathlib import Path
import pickle
-import re
+import regex as re
import signal
import sys
import tempfile
import click
import toml
from typed_ast import ast3, ast27
+from pathspec import PathSpec
# lib2to3 fork
from blib2to3.pytree import Node, Leaf, type_repr
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__))
report = Report(check=check, 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
err(f"invalid path: {s}")
if len(sources) == 0:
if verbose or not quiet:
- out("No paths given. Nothing to do 😴")
+ out("No Python files are present to be formatted. Nothing to do 😴")
ctx.exit(0)
if len(sources) == 1:
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 😴")
+ ctx.exit(0)
+
+
def reformat_one(
src: Path, fast: bool, write_back: WriteBack, mode: FileMode, report: "Report"
) -> None:
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.)"""
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]
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 leaf_id not in ignored_ids or comment_seen:
+ return True
+
+ comment_seen = True
+
+ return False
+
+ 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 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 in {
- syms.arglist,
- syms.typedargslist,
- }:
- 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."""
self.current_line.append(node)
yield from super().visit_default(node)
- def visit_atom(self, node: Node) -> Iterator[Line]:
- # Always make parentheses invisible around a single node, because it should
- # not be needed (except in the case of yield, where removing the parentheses
- # produces a SyntaxError).
- if (
- len(node.children) == 3
- and isinstance(node.children[0], Leaf)
- and node.children[0].type == token.LPAR
- and isinstance(node.children[2], Leaf)
- and node.children[2].type == token.RPAR
- and isinstance(node.children[1], Leaf)
- and not (
- node.children[1].type == token.NAME
- and node.children[1].value == "yield"
- )
- ):
- node.children[0].value = ""
- node.children[2].value = ""
- yield from super().visit_default(node)
-
- def visit_factor(self, node: Node) -> Iterator[Line]:
- """Force parentheses between a unary op and a binary power:
-
- -2 ** 8 -> -(2 ** 8)
- """
- child = node.children[1]
- if child.type == syms.power and len(child.children) == 3:
- lpar = Leaf(token.LPAR, "(")
- rpar = Leaf(token.RPAR, ")")
- index = child.remove() or 0
- node.insert_child(index, Node(syms.atom, [lpar, child, rpar]))
- yield from self.visit_default(node)
-
def visit_INDENT(self, node: Node) -> Iterator[Line]:
"""Increase indentation level, maybe yield a line."""
# In blib2to3 INDENT never holds comments.
yield from self.line()
yield from self.visit_default(leaf)
+ 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 __attrs_post_init__(self) -> None:
"""You are in a twisty little maze of passages."""
v = self.visit_stmt
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
# 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 is silly, but somehow produces better formatting
+ # than other things we've tried so far. See #762 and #781.
+ yield from right_hand_split(line, line_length=1, features=features)
if line.inside_brackets:
split_funcs = [delimiter_split, standalone_comment_split, rhs]
# Since body is a new indent level, remove spurious leading whitespace.
normalize_prefix(leaves[0], inside_brackets=True)
# Ensure a trailing comma for imports and standalone function arguments, but
- # be careful not to add one after any comments.
- no_commas = original.is_def and not any(
- l.type == token.COMMA for l in leaves
+ # 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:
)
-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:
if is_walrus_assignment(child):
continue
if child.type == syms.atom:
- if maybe_make_parens_invisible_in_atom(child, parent=node):
+ # Determines if the underlying atom should be surrounded with
+ # invisible params - also makes parens invisible recursively
+ # within the atom and removes repeated invisible parens within
+ # the atom
+ should_surround_with_parens = maybe_make_parens_invisible_in_atom(
+ child, parent=node
+ )
+
+ if should_surround_with_parens:
lpar = Leaf(token.LPAR, "")
rpar = Leaf(token.RPAR, "")
index = child.remove() or 0
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.
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
- maybe_make_parens_invisible_in_atom(node.children[1], parent=parent)
+ 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 (
return imports
+@lru_cache()
+def get_gitignore(root: Path) -> PathSpec:
+ """ Return a PathSpec matching gitignore content if present."""
+ gitignore = root / ".gitignore"
+ if not gitignore.is_file():
+ return PathSpec.from_lines("gitwildmatch", [])
+ else:
+ return PathSpec.from_lines("gitwildmatch", gitignore.open())
+
+
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.
"""
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(
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)
@contextmanager
def nullcontext() -> Iterator[None]:
- """Return context manager that does nothing.
- Similar to `nullcontext` from python 3.7"""
+ """Return an empty context manager.
+
+ To be used like `nullcontext` in Python 3.7.
+ """
yield
"""
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]]:
with cache_file.open("rb") as fobj:
try:
cache: Cache = pickle.load(fobj)
- except pickle.UnpicklingError:
+ except (pickle.UnpicklingError, ValueError):
return {}
return cache
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
projects / etc / vim.git / blobdiff