from blib2to3.pgen2.parse import ParseError
-__version__ = "18.6b4"
+__version__ = "18.9b0"
DEFAULT_LINE_LENGTH = 88
DEFAULT_EXCLUDES = (
- r"/(\.git|\.hg|\.mypy_cache|\.tox|\.venv|_build|buck-out|build|dist)/"
+ r"/(\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist)/"
)
DEFAULT_INCLUDES = r"\.pyi?$"
CACHE_DIR = Path(user_cache_dir("black", version=__version__))
class NothingChanged(UserWarning):
- """Raised by :func:`format_file` when reformatted code is the same as source."""
+ """Raised when reformatted code is the same as source."""
class CannotSplit(Exception):
- """A readable split that fits the allotted line length is impossible.
+ """A readable split that fits the allotted line length is impossible."""
- Raised by :func:`left_hand_split`, :func:`right_hand_split`, and
- :func:`delimiter_split`.
- """
+
+class InvalidInput(ValueError):
+ """Raised when input source code fails all parse attempts."""
class WriteBack(Enum):
NO = 0
YES = 1
DIFF = 2
+ CHECK = 3
@classmethod
def from_configuration(cls, *, check: bool, diff: bool) -> "WriteBack":
if check and not diff:
- return cls.NO
+ return cls.CHECK
return cls.DIFF if diff else cls.YES
PYTHON36 = 1
PYI = 2
NO_STRING_NORMALIZATION = 4
+ NO_NUMERIC_UNDERSCORE_NORMALIZATION = 8
@classmethod
def from_configuration(
- cls, *, py36: bool, pyi: bool, skip_string_normalization: bool
+ cls,
+ *,
+ py36: bool,
+ pyi: bool,
+ skip_string_normalization: bool,
+ skip_numeric_underscore_normalization: bool,
) -> "FileMode":
mode = cls.AUTO_DETECT
if py36:
mode |= cls.PYI
if skip_string_normalization:
mode |= cls.NO_STRING_NORMALIZATION
+ if skip_numeric_underscore_normalization:
+ mode |= cls.NO_NUMERIC_UNDERSCORE_NORMALIZATION
return mode
"--line-length",
type=int,
default=DEFAULT_LINE_LENGTH,
- help="How many character per line to allow.",
+ help="How many characters per line to allow.",
show_default=True,
)
@click.option(
is_flag=True,
help="Don't normalize string quotes or prefixes.",
)
+@click.option(
+ "-N",
+ "--skip-numeric-underscore-normalization",
+ is_flag=True,
+ help="Don't normalize underscores in numeric literals.",
+)
@click.option(
"--check",
is_flag=True,
pyi: bool,
py36: bool,
skip_string_normalization: bool,
+ skip_numeric_underscore_normalization: bool,
quiet: bool,
verbose: bool,
include: str,
"""The uncompromising code formatter."""
write_back = WriteBack.from_configuration(check=check, diff=diff)
mode = FileMode.from_configuration(
- py36=py36, pyi=pyi, skip_string_normalization=skip_string_normalization
+ py36=py36,
+ pyi=pyi,
+ skip_string_normalization=skip_string_normalization,
+ skip_numeric_underscore_normalization=skip_numeric_underscore_normalization,
)
if config and verbose:
out(f"Using configuration from {config}.", bold=False, fg="blue")
mode=mode,
):
changed = Changed.YES
- if write_back == WriteBack.YES and changed is not Changed.NO:
+ if (write_back is WriteBack.YES and changed is not Changed.CACHED) or (
+ write_back is WriteBack.CHECK and changed is Changed.NO
+ ):
write_cache(cache, [src], line_length, mode)
report.done(src, changed)
except Exception as exc:
sources, cached = filter_cached(cache, sources)
for src in sorted(cached):
report.done(src, Changed.CACHED)
+ if not sources:
+ return
+
cancelled = []
- formatted = []
- if sources:
- lock = None
- if write_back == WriteBack.DIFF:
- # For diff output, we need locks to ensure we don't interleave output
- # from different processes.
- manager = Manager()
- lock = manager.Lock()
- tasks = {
- loop.run_in_executor(
- executor,
- format_file_in_place,
- src,
- line_length,
- fast,
- write_back,
- mode,
- lock,
- ): src
- for src in sorted(sources)
- }
- pending: Iterable[asyncio.Task] = tasks.keys()
- try:
- loop.add_signal_handler(signal.SIGINT, cancel, pending)
- loop.add_signal_handler(signal.SIGTERM, cancel, pending)
- except NotImplementedError:
- # There are no good alternatives for these on Windows
- pass
- while pending:
- done, _ = await asyncio.wait(pending, return_when=asyncio.FIRST_COMPLETED)
- for task in done:
- src = tasks.pop(task)
- if task.cancelled():
- cancelled.append(task)
- elif task.exception():
- report.failed(src, str(task.exception()))
- else:
- formatted.append(src)
- report.done(src, Changed.YES if task.result() else Changed.NO)
+ sources_to_cache = []
+ lock = None
+ if write_back == WriteBack.DIFF:
+ # For diff output, we need locks to ensure we don't interleave output
+ # from different processes.
+ manager = Manager()
+ lock = manager.Lock()
+ tasks = {
+ loop.run_in_executor(
+ executor,
+ format_file_in_place,
+ src,
+ line_length,
+ fast,
+ write_back,
+ mode,
+ lock,
+ ): src
+ for src in sorted(sources)
+ }
+ pending: Iterable[asyncio.Task] = tasks.keys()
+ try:
+ loop.add_signal_handler(signal.SIGINT, cancel, pending)
+ loop.add_signal_handler(signal.SIGTERM, cancel, pending)
+ except NotImplementedError:
+ # There are no good alternatives for these on Windows.
+ pass
+ while pending:
+ done, _ = await asyncio.wait(pending, return_when=asyncio.FIRST_COMPLETED)
+ for task in done:
+ src = tasks.pop(task)
+ if task.cancelled():
+ cancelled.append(task)
+ elif task.exception():
+ report.failed(src, str(task.exception()))
+ else:
+ changed = Changed.YES if task.result() else Changed.NO
+ # If the file was written back or was successfully checked as
+ # well-formatted, store this information in the cache.
+ if write_back is WriteBack.YES or (
+ write_back is WriteBack.CHECK and changed is Changed.NO
+ ):
+ sources_to_cache.append(src)
+ report.done(src, changed)
if cancelled:
await asyncio.gather(*cancelled, loop=loop, return_exceptions=True)
- if write_back == WriteBack.YES and formatted:
- write_cache(cache, formatted, line_length, mode)
+ if sources_to_cache:
+ write_cache(cache, sources_to_cache, line_length, mode)
def format_file_in_place(
) -> bool:
"""Format file under `src` path. Return True if changed.
- If `write_back` is True, write reformatted code back to stdout.
+ If `write_back` is DIFF, write a diff to stdout. If it is YES, write reformatted
+ code to the file.
`line_length` and `fast` options are passed to :func:`format_file_contents`.
"""
if src.suffix == ".pyi":
) -> bool:
"""Format file on stdin. Return True if changed.
- If `write_back` is True, write reformatted code back to stdout.
+ If `write_back` is YES, write reformatted code back to stdout. If it is DIFF,
+ write a diff to stdout.
`line_length`, `fast`, `is_pyi`, and `force_py36` arguments are passed to
:func:`format_file_contents`.
"""
`line_length` determines how many characters per line are allowed.
"""
- src_node = lib2to3_parse(src_contents)
+ src_node = lib2to3_parse(src_contents.lstrip())
dst_contents = ""
future_imports = get_future_imports(src_node)
is_pyi = bool(mode & FileMode.PYI)
remove_u_prefix=py36 or "unicode_literals" in future_imports,
is_pyi=is_pyi,
normalize_strings=normalize_strings,
+ allow_underscores=py36
+ and not bool(mode & FileMode.NO_NUMERIC_UNDERSCORE_NORMALIZATION),
)
elt = EmptyLineTracker(is_pyi=is_pyi)
empty_line = Line()
faulty_line = lines[lineno - 1]
except IndexError:
faulty_line = "<line number missing in source>"
- exc = ValueError(f"Cannot parse: {lineno}:{column}: {faulty_line}")
+ exc = InvalidInput(f"Cannot parse: {lineno}:{column}: {faulty_line}")
else:
raise exc from None
syms.testlist_gexp,
syms.testlist_star_expr,
}
-SURROUNDED_BY_BRACKETS = {
- syms.typedargslist,
- syms.arglist,
- syms.subscriptlist,
- syms.vfplist,
- syms.import_as_names,
- syms.yield_expr,
- syms.testlist_gexp,
- syms.testlist_star_expr,
- syms.listmaker,
- syms.dictsetmaker,
-}
TEST_DESCENDANTS = {
syms.test,
syms.lambdef,
bracket_match: Dict[Tuple[Depth, NodeType], Leaf] = Factory(dict)
delimiters: Dict[LeafID, Priority] = Factory(dict)
previous: Optional[Leaf] = None
- _for_loop_variable: int = 0
- _lambda_arguments: int = 0
+ _for_loop_depths: List[int] = Factory(list)
+ _lambda_argument_depths: List[int] = Factory(list)
def mark(self, leaf: Leaf) -> None:
"""Mark `leaf` with bracket-related metadata. Keep track of delimiters.
"""
if leaf.type == token.NAME and leaf.value == "for":
self.depth += 1
- self._for_loop_variable += 1
+ self._for_loop_depths.append(self.depth)
return True
return False
def maybe_decrement_after_for_loop_variable(self, leaf: Leaf) -> bool:
"""See `maybe_increment_for_loop_variable` above for explanation."""
- if self._for_loop_variable and leaf.type == token.NAME and leaf.value == "in":
+ if (
+ self._for_loop_depths
+ and self._for_loop_depths[-1] == self.depth
+ and leaf.type == token.NAME
+ and leaf.value == "in"
+ ):
self.depth -= 1
- self._for_loop_variable -= 1
+ self._for_loop_depths.pop()
return True
return False
"""
if leaf.type == token.NAME and leaf.value == "lambda":
self.depth += 1
- self._lambda_arguments += 1
+ self._lambda_argument_depths.append(self.depth)
return True
return False
def maybe_decrement_after_lambda_arguments(self, leaf: Leaf) -> bool:
"""See `maybe_increment_lambda_arguments` above for explanation."""
- if self._lambda_arguments and leaf.type == token.COLON:
+ if (
+ self._lambda_argument_depths
+ and self._lambda_argument_depths[-1] == self.depth
+ and leaf.type == token.COLON
+ ):
self.depth -= 1
- self._lambda_arguments -= 1
+ self._lambda_argument_depths.pop()
return True
return False
self.remove_trailing_comma()
return True
- # Otheriwsse, if the trailing one is the only one, we might mistakenly
+ # Otherwise, if the trailing one is the only one, we might mistakenly
# change a tuple into a different type by removing the comma.
depth = closing.bracket_depth + 1
commas = 0
newlines = 1
elif current_line.is_class or self.previous_line.is_class:
if current_line.is_stub_class and self.previous_line.is_stub_class:
- # No blank line between classes with an emty body
+ # No blank line between classes with an empty body
newlines = 0
else:
newlines = 1
normalize_strings: bool = True
current_line: Line = Factory(Line)
remove_u_prefix: bool = False
+ allow_underscores: bool = False
def line(self, indent: int = 0) -> Iterator[Line]:
"""Generate a line.
if self.normalize_strings and node.type == token.STRING:
normalize_string_prefix(node, remove_u_prefix=self.remove_u_prefix)
normalize_string_quotes(node)
+ if node.type == token.NUMBER:
+ normalize_numeric_literal(node, self.allow_underscores)
if node.type not in WHITESPACE:
self.current_line.append(node)
yield from super().visit_default(node)
if parent.type == syms.file_input:
break
- if parent.type in SURROUNDED_BY_BRACKETS:
+ if parent.prev_sibling is not None and parent.prev_sibling.type in BRACKETS:
break
container = parent
def is_split_before_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
- """Return the priority of the `leaf` delimiter, given a line before after it.
+ """Return the priority of the `leaf` delimiter, given a line break before it.
The delimiter priorities returned here are from those delimiters that would
cause a line break before themselves.
):
return STRING_PRIORITY
- if leaf.type != token.NAME:
+ if leaf.type not in {token.NAME, token.ASYNC}:
return 0
if (
leaf.value == "for"
and leaf.parent
and leaf.parent.type in {syms.comp_for, syms.old_comp_for}
+ or leaf.type == token.ASYNC
):
- return COMPREHENSION_PRIORITY
+ if (
+ not isinstance(leaf.prev_sibling, Leaf)
+ or leaf.prev_sibling.value != "async"
+ ):
+ return COMPREHENSION_PRIORITY
if (
leaf.value == "if"
@dataclass
class ProtoComment:
+ """Describes a piece of syntax that is a comment.
+
+ It's not a :class:`blib2to3.pytree.Leaf` so that:
+
+ * it can be cached (`Leaf` objects should not be reused more than once as
+ they store their lineno, column, prefix, and parent information);
+ * `newlines` and `consumed` fields are kept separate from the `value`. This
+ simplifies handling of special marker comments like ``# fmt: off/on``.
+ """
+
type: int # token.COMMENT or STANDALONE_COMMENT
value: str # content of the comment
newlines: int # how many newlines before the comment
@lru_cache(maxsize=4096)
def list_comments(prefix: str, *, is_endmarker: bool) -> List[ProtoComment]:
+ """Return a list of :class:`ProtoComment` objects parsed from the given `prefix`."""
result: List[ProtoComment] = []
if not prefix or "#" not in prefix:
return result
def make_comment(content: str) -> str:
"""Return a consistently formatted comment from the given `content` string.
- All comments (except for "##", "#!", "#:") should have a single space between
- the hash sign and the content.
+ All comments (except for "##", "#!", "#:", '#'", "#%%") should have a single
+ space between the hash sign and the content.
If `content` didn't start with a hash sign, one is provided.
"""
if content[0] == "#":
content = content[1:]
- if content and content[0] not in " !:#":
+ if content and content[0] not in " !:#'%":
content = " " + content
return "#" + content
Prefer RHS otherwise. This is why this function is not symmetrical with
:func:`right_hand_split` which also handles optional parentheses.
"""
- head = Line(depth=line.depth)
- body = Line(depth=line.depth + 1, inside_brackets=True)
- tail = Line(depth=line.depth)
tail_leaves: List[Leaf] = []
body_leaves: List[Leaf] = []
head_leaves: List[Leaf] = []
if leaf.type in OPENING_BRACKETS:
matching_bracket = leaf
current_leaves = body_leaves
- # Since body is a new indent level, remove spurious leading whitespace.
- if body_leaves:
- normalize_prefix(body_leaves[0], inside_brackets=True)
- # Build the new lines.
- for result, leaves in (head, head_leaves), (body, body_leaves), (tail, tail_leaves):
- for leaf in leaves:
- result.append(leaf, preformatted=True)
- for comment_after in line.comments_after(leaf):
- result.append(comment_after, preformatted=True)
+ if not matching_bracket:
+ raise CannotSplit("No brackets found")
+
+ head = bracket_split_build_line(head_leaves, line, matching_bracket)
+ body = bracket_split_build_line(body_leaves, line, matching_bracket, is_body=True)
+ tail = bracket_split_build_line(tail_leaves, line, matching_bracket)
bracket_split_succeeded_or_raise(head, body, tail)
for result in (head, body, tail):
if result:
Note: running this function modifies `bracket_depth` on the leaves of `line`.
"""
- head = Line(depth=line.depth)
- body = Line(depth=line.depth + 1, inside_brackets=True)
- tail = Line(depth=line.depth)
tail_leaves: List[Leaf] = []
body_leaves: List[Leaf] = []
head_leaves: List[Leaf] = []
opening_bracket = leaf.opening_bracket
closing_bracket = leaf
current_leaves = body_leaves
- tail_leaves.reverse()
- body_leaves.reverse()
- head_leaves.reverse()
- # Since body is a new indent level, remove spurious leading whitespace.
- if body_leaves:
- normalize_prefix(body_leaves[0], inside_brackets=True)
- if not head_leaves:
- # No `head` means the split failed. Either `tail` has all content or
+ if not (opening_bracket and closing_bracket and head_leaves):
+ # If there is no opening or closing_bracket that means the split failed and
+ # all content is in the tail. Otherwise, if `head_leaves` are empty, it means
# the matching `opening_bracket` wasn't available on `line` anymore.
raise CannotSplit("No brackets found")
- # Build the new lines.
- for result, leaves in (head, head_leaves), (body, body_leaves), (tail, tail_leaves):
- for leaf in leaves:
- result.append(leaf, preformatted=True)
- for comment_after in line.comments_after(leaf):
- result.append(comment_after, preformatted=True)
- assert opening_bracket and closing_bracket
- body.should_explode = should_explode(body, opening_bracket)
+ tail_leaves.reverse()
+ body_leaves.reverse()
+ head_leaves.reverse()
+ head = bracket_split_build_line(head_leaves, line, opening_bracket)
+ body = bracket_split_build_line(body_leaves, line, opening_bracket, is_body=True)
+ tail = bracket_split_build_line(tail_leaves, line, opening_bracket)
bracket_split_succeeded_or_raise(head, body, tail)
if (
# the body shouldn't be exploded
)
+def bracket_split_build_line(
+ leaves: List[Leaf], original: Line, opening_bracket: Leaf, *, is_body: bool = False
+) -> Line:
+ """Return a new line with given `leaves` and respective comments from `original`.
+
+ If `is_body` is True, the result line is one-indented inside brackets and as such
+ has its first leaf's prefix normalized and a trailing comma added when expected.
+ """
+ result = Line(depth=original.depth)
+ if is_body:
+ result.inside_brackets = True
+ result.depth += 1
+ if leaves:
+ # Since body is a new indent level, remove spurious leading whitespace.
+ normalize_prefix(leaves[0], inside_brackets=True)
+ # Ensure a trailing comma when expected.
+ if original.is_import:
+ if leaves[-1].type != token.COMMA:
+ leaves.append(Leaf(token.COMMA, ","))
+ # Populate the line
+ for leaf in leaves:
+ result.append(leaf, preformatted=True)
+ for comment_after in original.comments_after(leaf):
+ result.append(comment_after, preformatted=True)
+ if is_body:
+ result.should_explode = should_explode(result, opening_bracket)
+ return result
+
+
def dont_increase_indentation(split_func: SplitFunc) -> SplitFunc:
"""Normalize prefix of the first leaf in every line returned by `split_func`.
leaf.value = f"{prefix}{new_quote}{new_body}{new_quote}"
+def normalize_numeric_literal(leaf: Leaf, allow_underscores: bool) -> None:
+ """Normalizes numeric (float, int, and complex) literals.
+
+ All letters used in the representation are normalized to lowercase (except
+ in Python 2 long literals), and long number literals are split using underscores.
+ """
+ text = leaf.value.lower()
+ if text.startswith(("0o", "0b")):
+ # Leave octal and binary literals alone.
+ pass
+ elif text.startswith("0x"):
+ # Change hex literals to upper case.
+ before, after = text[:2], text[2:]
+ text = f"{before}{after.upper()}"
+ elif "e" in text:
+ before, after = text.split("e")
+ sign = ""
+ if after.startswith("-"):
+ after = after[1:]
+ sign = "-"
+ elif after.startswith("+"):
+ after = after[1:]
+ before = format_float_or_int_string(before, allow_underscores)
+ after = format_int_string(after, allow_underscores)
+ text = f"{before}e{sign}{after}"
+ elif text.endswith(("j", "l")):
+ number = text[:-1]
+ suffix = text[-1]
+ # Capitalize in "2L" because "l" looks too similar to "1".
+ if suffix == "l":
+ suffix = "L"
+ text = f"{format_float_or_int_string(number, allow_underscores)}{suffix}"
+ else:
+ text = format_float_or_int_string(text, allow_underscores)
+ leaf.value = text
+
+
+def format_float_or_int_string(text: str, allow_underscores: bool) -> str:
+ """Formats a float string like "1.0"."""
+ if "." not in text:
+ return format_int_string(text, allow_underscores)
+
+ before, after = text.split(".")
+ before = format_int_string(before, allow_underscores) if before else "0"
+ if after:
+ after = format_int_string(after, allow_underscores, count_from_end=False)
+ else:
+ after = "0"
+ return f"{before}.{after}"
+
+
+def format_int_string(
+ text: str, allow_underscores: bool, count_from_end: bool = True
+) -> str:
+ """Normalizes underscores in a string to e.g. 1_000_000.
+
+ Input must be a string of digits and optional underscores.
+ If count_from_end is False, we add underscores after groups of three digits
+ counting from the beginning instead of the end of the strings. This is used
+ for the fractional part of float literals.
+ """
+ if not allow_underscores:
+ return text
+
+ text = text.replace("_", "")
+ if len(text) <= 5:
+ # No underscores for numbers <= 5 digits long.
+ return text
+
+ if count_from_end:
+ # Avoid removing leading zeros, which are important if we're formatting
+ # part of a number like "0.001".
+ return format(int("1" + text), "3_")[1:].lstrip("_")
+ else:
+ return "_".join(text[i : i + 3] for i in range(0, len(text), 3))
+
+
def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
"""Make existing optional parentheses invisible or create new ones.
for index, child in enumerate(list(node.children)):
if check_lpar:
if child.type == syms.atom:
- maybe_make_parens_invisible_in_atom(child)
+ 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]))
elif is_one_tuple(child):
# wrap child in visible parentheses
lpar = Leaf(token.LPAR, "(")
def maybe_make_parens_invisible_in_atom(node: LN) -> bool:
- """If it's safe, make the parens in the atom `node` invisible, recursively."""
+ """If it's safe, make the parens in the atom `node` invisible, recursively.
+
+ Returns whether the node should itself be wrapped in invisible parentheses.
+
+ """
if (
node.type != syms.atom
or is_empty_tuple(node)
last.value = "" # type: ignore
if len(node.children) > 1:
maybe_make_parens_invisible_in_atom(node.children[1])
- return True
+ return False
- return False
+ return True
def is_empty_tuple(node: LN) -> bool:
"""Return True if the current file is using Python 3.6+ features.
Currently looking for:
- - f-strings; and
+ - f-strings;
+ - underscores in numeric literals; and
- trailing commas after * or ** in function signatures and calls.
"""
for n in node.pre_order():
if value_head in {'f"', 'F"', "f'", "F'", "rf", "fr", "RF", "FR"}:
return True
+ elif n.type == token.NUMBER:
+ if "_" in n.value: # type: ignore
+ return True
+
elif (
n.type in {syms.typedargslist, syms.arglist}
and n.children
length = 4 * line.depth
opening_bracket = None
closing_bracket = None
- optional_brackets: Set[LeafID] = set()
inner_brackets: Set[LeafID] = set()
for index, leaf, leaf_length in enumerate_with_length(line, reversed=True):
length += leaf_length
if leaf.type == STANDALONE_COMMENT or has_inline_comment:
break
- optional_brackets.discard(id(leaf))
if opening_bracket:
if leaf is opening_bracket:
opening_bracket = None
elif leaf.type in CLOSING_BRACKETS:
inner_brackets.add(id(leaf))
elif leaf.type in CLOSING_BRACKETS:
- if not leaf.value:
- optional_brackets.add(id(opening_bracket))
- continue
-
if index > 0 and line.leaves[index - 1].type in OPENING_BRACKETS:
# Empty brackets would fail a split so treat them as "inner"
# brackets (e.g. only add them to the `omit` set if another
inner_brackets.add(id(leaf))
continue
- opening_bracket = leaf.opening_bracket
if closing_bracket:
omit.add(id(closing_bracket))
omit.update(inner_brackets)
inner_brackets.clear()
yield omit
- closing_bracket = leaf
+
+ if leaf.value:
+ opening_bracket = leaf.opening_bracket
+ closing_bracket = leaf
def get_future_imports(node: Node) -> Set[str]:
- otherwise return 0.
"""
# According to http://tldp.org/LDP/abs/html/exitcodes.html starting with
- # 126 we have special returncodes reserved by the shell.
+ # 126 we have special return codes reserved by the shell.
if self.failure_count:
return 123
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