#!/usr/bin/env python3
import asyncio
+import pickle
from asyncio.base_events import BaseEventLoop
from concurrent.futures import Executor, ProcessPoolExecutor
from enum import Enum
Iterator,
List,
Optional,
+ Pattern,
Set,
Tuple,
Type,
Union,
)
+from appdirs import user_cache_dir
from attr import dataclass, Factory
import click
from blib2to3.pgen2 import driver, token
from blib2to3.pgen2.parse import ParseError
-__version__ = "18.4a1"
+__version__ = "18.4a2"
DEFAULT_LINE_LENGTH = 88
# types
syms = pygram.python_symbols
Index = int
LN = Union[Leaf, Node]
SplitFunc = Callable[["Line", bool], Iterator["Line"]]
+Timestamp = float
+FileSize = int
+CacheInfo = Tuple[Timestamp, FileSize]
+Cache = Dict[Path, CacheInfo]
out = partial(click.secho, bold=True, err=True)
err = partial(click.secho, fg="red", err=True)
DIFF = 2
+class Changed(Enum):
+ NO = 0
+ CACHED = 1
+ YES = 2
+
+
@click.command()
@click.option(
"-l",
sources.append(Path("-"))
else:
err(f"invalid path: {s}")
- if check and diff:
- exc = click.ClickException("Options --check and --diff are mutually exclusive")
- exc.exit_code = 2
- raise exc
- if check:
+ if check and not diff:
write_back = WriteBack.NO
elif diff:
write_back = WriteBack.DIFF
write_back = WriteBack.YES
if len(sources) == 0:
ctx.exit(0)
+ return
+
elif len(sources) == 1:
- p = sources[0]
- report = Report(check=check, quiet=quiet)
- try:
- if not p.is_file() and str(p) == "-":
- changed = format_stdin_to_stdout(
- line_length=line_length, fast=fast, write_back=write_back
- )
- else:
- changed = format_file_in_place(
- p, line_length=line_length, fast=fast, write_back=write_back
- )
- report.done(p, changed)
- except Exception as exc:
- report.failed(p, str(exc))
- ctx.exit(report.return_code)
+ return_code = reformat_one(
+ sources[0], line_length, fast, quiet, write_back, check
+ )
else:
loop = asyncio.get_event_loop()
executor = ProcessPoolExecutor(max_workers=os.cpu_count())
try:
return_code = loop.run_until_complete(
schedule_formatting(
- sources, line_length, write_back, fast, quiet, loop, executor
+ sources, line_length, write_back, fast, quiet, loop, executor, check
)
)
finally:
shutdown(loop)
- ctx.exit(return_code)
+ ctx.exit(return_code)
+
+
+def reformat_one(
+ src: Path,
+ line_length: int,
+ fast: bool,
+ quiet: bool,
+ write_back: WriteBack,
+ check: bool,
+) -> int:
+ """Reformat a single file under `src` without spawning child processes.
+
+ If `quiet` is True, non-error messages are not output. `line_length`,
+ `write_back`, and `fast` options are passed to :func:`format_file_in_place`.
+ """
+ report = Report(check=check, quiet=quiet)
+ try:
+ changed = Changed.NO
+ if not src.is_file() and str(src) == "-":
+ if format_stdin_to_stdout(
+ line_length=line_length, fast=fast, write_back=write_back
+ ):
+ changed = Changed.YES
+ else:
+ cache: Cache = {}
+ if write_back != WriteBack.DIFF:
+ cache = read_cache()
+ src = src.resolve()
+ if src in cache and cache[src] == get_cache_info(src):
+ changed = Changed.CACHED
+ if (
+ changed is not Changed.CACHED
+ and format_file_in_place(
+ src, line_length=line_length, fast=fast, write_back=write_back
+ )
+ ):
+ changed = Changed.YES
+ if write_back != WriteBack.DIFF and changed is not Changed.NO:
+ write_cache(cache, [src])
+ report.done(src, changed)
+ except Exception as exc:
+ report.failed(src, str(exc))
+ return report.return_code
async def schedule_formatting(
quiet: bool,
loop: BaseEventLoop,
executor: Executor,
+ check: bool,
) -> int:
"""Run formatting of `sources` in parallel using the provided `executor`.
`line_length`, `write_back`, and `fast` options are passed to
:func:`format_file_in_place`.
"""
- 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 = {
- src: loop.run_in_executor(
- executor, format_file_in_place, src, line_length, fast, write_back, lock
- )
- for src in sources
- }
- _task_values = list(tasks.values())
- loop.add_signal_handler(signal.SIGINT, cancel, _task_values)
- loop.add_signal_handler(signal.SIGTERM, cancel, _task_values)
- await asyncio.wait(tasks.values())
+ report = Report(check=check, quiet=quiet)
+ cache: Cache = {}
+ if write_back != WriteBack.DIFF:
+ cache = read_cache()
+ sources, cached = filter_cached(cache, sources)
+ for src in cached:
+ report.done(src, Changed.CACHED)
cancelled = []
- report = Report(check=write_back is WriteBack.NO, quiet=quiet)
- for src, task in tasks.items():
- if not task.done():
- report.failed(src, "timed out, cancelling")
- task.cancel()
- cancelled.append(task)
- elif task.cancelled():
- cancelled.append(task)
- elif task.exception():
- report.failed(src, str(task.exception()))
- else:
- report.done(src, task.result())
+ 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 = {
+ src: loop.run_in_executor(
+ executor, format_file_in_place, src, line_length, fast, write_back, lock
+ )
+ for src in sources
+ }
+ _task_values = list(tasks.values())
+ try:
+ loop.add_signal_handler(signal.SIGINT, cancel, _task_values)
+ loop.add_signal_handler(signal.SIGTERM, cancel, _task_values)
+ except NotImplementedError:
+ # There are no good alternatives for these on Windows
+ pass
+ await asyncio.wait(_task_values)
+ for src, task in tasks.items():
+ if not task.done():
+ report.failed(src, "timed out, cancelling")
+ task.cancel()
+ cancelled.append(task)
+ elif 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)
+
if cancelled:
await asyncio.gather(*cancelled, loop=loop, return_exceptions=True)
elif not quiet:
out("All done! ✨ 🍰 ✨")
if not quiet:
click.echo(str(report))
+
+ if write_back != WriteBack.DIFF and formatted:
+ write_cache(cache, formatted)
+
return report.return_code
If `write_back` is True, write reformatted code back to stdout.
`line_length` and `fast` options are passed to :func:`format_file_contents`.
"""
+
with tokenize.open(src) as src_buffer:
src_contents = src_buffer.read()
try:
token.DOUBLESTAR,
token.DOUBLESLASH,
}
-VARARGS = {token.STAR, token.DOUBLESTAR}
+STARS = {token.STAR, token.DOUBLESTAR}
+VARARGS_PARENTS = {
+ syms.arglist,
+ syms.argument, # double star in arglist
+ syms.trailer, # single argument to call
+ syms.typedargslist,
+ syms.varargslist, # lambdas
+}
+UNPACKING_PARENTS = {
+ syms.atom, # single element of a list or set literal
+ syms.dictsetmaker,
+ syms.listmaker,
+ syms.testlist_gexp,
+}
COMPREHENSION_PRIORITY = 20
COMMA_PRIORITY = 10
LOGIC_PRIORITY = 5
bracket_match: Dict[Tuple[Depth, NodeType], Leaf] = Factory(dict)
delimiters: Dict[LeafID, Priority] = Factory(dict)
previous: Optional[Leaf] = None
+ _for_loop_variable: bool = False
+ _lambda_arguments: bool = False
def mark(self, leaf: Leaf) -> None:
"""Mark `leaf` with bracket-related metadata. Keep track of delimiters.
if leaf.type == token.COMMENT:
return
+ self.maybe_decrement_after_for_loop_variable(leaf)
+ self.maybe_decrement_after_lambda_arguments(leaf)
if leaf.type in CLOSING_BRACKETS:
self.depth -= 1
opening_bracket = self.bracket_match.pop((self.depth, leaf.type))
self.bracket_match[self.depth, BRACKET[leaf.type]] = leaf
self.depth += 1
self.previous = leaf
+ self.maybe_increment_lambda_arguments(leaf)
+ self.maybe_increment_for_loop_variable(leaf)
def any_open_brackets(self) -> bool:
"""Return True if there is an yet unmatched open bracket on the line."""
def max_delimiter_priority(self, exclude: Iterable[LeafID] = ()) -> int:
"""Return the highest priority of a delimiter found on the line.
- Values are consistent with what `is_delimiter()` returns.
+ Values are consistent with what `is_split_*_delimiter()` return.
Raises ValueError on no delimiters.
"""
return max(v for k, v in self.delimiters.items() if k not in exclude)
+ def maybe_increment_for_loop_variable(self, leaf: Leaf) -> bool:
+ """In a for loop, or comprehension, the variables are often unpacks.
+
+ To avoid splitting on the comma in this situation, increase the depth of
+ tokens between `for` and `in`.
+ """
+ if leaf.type == token.NAME and leaf.value == "for":
+ self.depth += 1
+ self._for_loop_variable = True
+ 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":
+ self.depth -= 1
+ self._for_loop_variable = False
+ return True
+
+ return False
+
+ def maybe_increment_lambda_arguments(self, leaf: Leaf) -> bool:
+ """In a lambda expression, there might be more than one argument.
+
+ To avoid splitting on the comma in this situation, increase the depth of
+ tokens between `lambda` and `:`.
+ """
+ if leaf.type == token.NAME and leaf.value == "lambda":
+ self.depth += 1
+ self._lambda_arguments = True
+ 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:
+ self.depth -= 1
+ self._lambda_arguments = False
+ return True
+
+ return False
+
@dataclass
class Line:
comments: List[Tuple[Index, Leaf]] = Factory(list)
bracket_tracker: BracketTracker = Factory(BracketTracker)
inside_brackets: bool = False
- has_for: bool = False
- _for_loop_variable: bool = False
def append(self, leaf: Leaf, preformatted: bool = False) -> None:
"""Add a new `leaf` to the end of the line.
# imports, for which we only preserve newlines.
leaf.prefix += whitespace(leaf)
if self.inside_brackets or not preformatted:
- self.maybe_decrement_after_for_loop_variable(leaf)
self.bracket_tracker.mark(leaf)
self.maybe_remove_trailing_comma(leaf)
- self.maybe_increment_for_loop_variable(leaf)
if not self.append_comment(leaf):
self.leaves.append(leaf)
return False
- def maybe_increment_for_loop_variable(self, leaf: Leaf) -> bool:
- """In a for loop, or comprehension, the variables are often unpacks.
-
- To avoid splitting on the comma in this situation, increase the depth of
- tokens between `for` and `in`.
- """
- if leaf.type == token.NAME and leaf.value == "for":
- self.has_for = True
- self.bracket_tracker.depth += 1
- self._for_loop_variable = True
- 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":
- self.bracket_tracker.depth -= 1
- self._for_loop_variable = False
- return True
-
- return False
-
def append_comment(self, comment: Leaf) -> bool:
"""Add an inline or standalone comment to the line."""
if (
# that, too.
return prevp.prefix
- elif prevp.type == token.DOUBLESTAR:
- if (
- prevp.parent
- and prevp.parent.type in {
- syms.arglist,
- syms.argument,
- syms.dictsetmaker,
- syms.parameters,
- syms.typedargslist,
- syms.varargslist,
- }
- ):
+ elif prevp.type in STARS:
+ if is_vararg(prevp, within=VARARGS_PARENTS | UNPACKING_PARENTS):
return NO
elif prevp.type == token.COLON:
elif (
prevp.parent
- and prevp.parent.type in {syms.factor, syms.star_expr}
+ and prevp.parent.type == syms.factor
and prevp.type in MATH_OPERATORS
):
return NO
if p.type in {syms.parameters, syms.arglist}:
# untyped function signatures or calls
- if t == token.RPAR:
- return NO
-
if not prev or prev.type != token.COMMA:
return NO
elif p.type == syms.varargslist:
# lambdas
- if t == token.RPAR:
- return NO
-
if prev and prev.type != token.COMMA:
return NO
if not prevp or prevp.type == token.LPAR:
return NO
- elif prev.type == token.EQUAL or prev.type == token.DOUBLESTAR:
+ elif prev.type in {token.EQUAL} | STARS:
return NO
elif p.type == syms.decorator:
# dots, but not the first one.
return NO
- elif (
- p.type == syms.listmaker
- or p.type == syms.testlist_gexp
- or p.type == syms.subscriptlist
- ):
- # list interior, including unpacking
- if not prev:
- return NO
-
elif p.type == syms.dictsetmaker:
- # dict and set interior, including unpacking
- if not prev:
- return NO
-
- if prev.type == token.DOUBLESTAR:
+ # dict unpacking
+ if prev and prev.type == token.DOUBLESTAR:
return NO
elif p.type in {syms.factor, syms.star_expr}:
Higher numbers are higher priority.
"""
- if (
- leaf.type in VARARGS
- and leaf.parent
- and leaf.parent.type in {syms.argument, syms.typedargslist, syms.dictsetmaker}
- ):
+ if is_vararg(leaf, within=VARARGS_PARENTS | UNPACKING_PARENTS):
# * and ** might also be MATH_OPERATORS but in this case they are not.
# Don't treat them as a delimiter.
return 0
return 0
-def is_delimiter(leaf: Leaf, previous: Leaf = None) -> int:
- """Return the priority of the `leaf` delimiter. Return 0 if not delimiter.
-
- Higher numbers are higher priority.
- """
- return max(
- is_split_before_delimiter(leaf, previous),
- is_split_after_delimiter(leaf, previous),
- )
-
-
def generate_comments(leaf: Leaf) -> Iterator[Leaf]:
"""Clean the prefix of the `leaf` and generate comments from it, if any.
lowest_depth = min(lowest_depth, leaf.bracket_depth)
if (
leaf.bracket_depth == lowest_depth
- and leaf.type == token.STAR
- or leaf.type == token.DOUBLESTAR
+ and is_vararg(leaf, within=VARARGS_PARENTS)
):
trailing_comma_safe = trailing_comma_safe and py36
leaf_priority = delimiters.get(id(leaf))
return # There's an internal error
prefix = leaf.value[:first_quote_pos]
- body = leaf.value[first_quote_pos + len(orig_quote):-len(orig_quote)]
unescaped_new_quote = re.compile(rf"(([^\\]|^)(\\\\)*){new_quote}")
- escaped_orig_quote = re.compile(rf"\\(\\\\)*{orig_quote}")
+ escaped_new_quote = re.compile(rf"([^\\]|^)\\(\\\\)*{new_quote}")
+ escaped_orig_quote = re.compile(rf"([^\\]|^)\\(\\\\)*{orig_quote}")
+ body = leaf.value[first_quote_pos + len(orig_quote):-len(orig_quote)]
if "r" in prefix.casefold():
if unescaped_new_quote.search(body):
# There's at least one unescaped new_quote in this raw string
# Do not introduce or remove backslashes in raw strings
new_body = body
else:
- new_body = escaped_orig_quote.sub(rf"\1{orig_quote}", body)
- new_body = unescaped_new_quote.sub(rf"\1\\{new_quote}", new_body)
- # Add escapes again for consecutive occurences of new_quote (sub
- # doesn't match overlapping substrings).
- new_body = unescaped_new_quote.sub(rf"\1\\{new_quote}", new_body)
+ # remove unnecessary quotes
+ new_body = sub_twice(escaped_new_quote, rf"\1\2{new_quote}", body)
+ if body != new_body:
+ # Consider the string without unnecessary quotes as the original
+ body = new_body
+ leaf.value = f"{prefix}{orig_quote}{body}{orig_quote}"
+ 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 new_quote == '"""' and new_body[-1] == '"':
# edge case:
new_body = new_body[:-1] + '\\"'
)
+def is_vararg(leaf: Leaf, within: Set[NodeType]) -> bool:
+ """Return True if `leaf` is a star or double star in a vararg or kwarg.
+
+ If `within` includes VARARGS_PARENTS, this applies to function signatures.
+ If `within` includes COLLECTION_LIBERALS_PARENTS, it applies to right
+ hand-side extended iterable unpacking (PEP 3132) and additional unpacking
+ generalizations (PEP 448).
+ """
+ if leaf.type not in STARS or not leaf.parent:
+ return False
+
+ p = leaf.parent
+ if p.type == syms.star_expr:
+ # Star expressions are also used as assignment targets in extended
+ # iterable unpacking (PEP 3132). See what its parent is instead.
+ if not p.parent:
+ return False
+
+ p = p.parent
+
+ return p.type in within
+
+
def max_delimiter_priority_in_atom(node: LN) -> int:
+ """Return maximum delimiter priority inside `node`.
+
+ This is specific to atoms with contents contained in a pair of parentheses.
+ If `node` isn't an atom or there are no enclosing parentheses, returns 0.
+ """
if node.type != syms.atom:
return 0
and n.children[-1].type == token.COMMA
):
for ch in n.children:
- if ch.type == token.STAR or ch.type == token.DOUBLESTAR:
+ if ch.type in STARS:
return True
return False
same_count: int = 0
failure_count: int = 0
- def done(self, src: Path, changed: bool) -> None:
+ def done(self, src: Path, changed: Changed) -> None:
"""Increment the counter for successful reformatting. Write out a message."""
- if changed:
+ if changed is Changed.YES:
reformatted = "would reformat" if self.check else "reformatted"
if not self.quiet:
out(f"{reformatted} {src}")
self.change_count += 1
else:
if not self.quiet:
- out(f"{src} already well formatted, good job.", bold=False)
+ if changed is Changed.NO:
+ msg = f"{src} already well formatted, good job."
+ else:
+ msg = f"{src} wasn't modified on disk since last run."
+ out(msg, bold=False)
self.same_count += 1
def failed(self, src: Path, message: str) -> None:
import tempfile
with tempfile.NamedTemporaryFile(
- mode="w", prefix="blk_", suffix=".log", delete=False
+ mode="w", prefix="blk_", suffix=".log", delete=False, encoding="utf8"
) as f:
for lines in output:
f.write(lines)
loop.close()
+def sub_twice(regex: Pattern[str], replacement: str, original: str) -> str:
+ """Replace `regex` with `replacement` twice on `original`.
+
+ This is used by string normalization to perform replaces on
+ overlapping matches.
+ """
+ return regex.sub(replacement, regex.sub(replacement, original))
+
+
+CACHE_DIR = Path(user_cache_dir("black", version=__version__))
+CACHE_FILE = CACHE_DIR / "cache.pickle"
+
+
+def read_cache() -> 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.
+ """
+ if not CACHE_FILE.exists():
+ return {}
+
+ with CACHE_FILE.open("rb") as fobj:
+ try:
+ cache: Cache = pickle.load(fobj)
+ except pickle.UnpicklingError:
+ return {}
+
+ return cache
+
+
+def get_cache_info(path: Path) -> CacheInfo:
+ """Return the information used to check if a file is already formatted or not."""
+ stat = path.stat()
+ return stat.st_mtime, stat.st_size
+
+
+def filter_cached(
+ cache: Cache, sources: Iterable[Path]
+) -> Tuple[List[Path], List[Path]]:
+ """Split a list of paths into two.
+
+ The first list contains paths of files that modified on disk or are not in the
+ cache. The other list contains paths to non-modified files.
+ """
+ todo, done = [], []
+ for src in sources:
+ src = src.resolve()
+ if cache.get(src) != get_cache_info(src):
+ todo.append(src)
+ else:
+ done.append(src)
+ return todo, done
+
+
+def write_cache(cache: Cache, sources: List[Path]) -> None:
+ """Update the cache file."""
+ try:
+ if not CACHE_DIR.exists():
+ CACHE_DIR.mkdir(parents=True)
+ new_cache = {**cache, **{src.resolve(): get_cache_info(src) for src in sources}}
+ with CACHE_FILE.open("wb") as fobj:
+ pickle.dump(new_cache, fobj, protocol=pickle.HIGHEST_PROTOCOL)
+ except OSError:
+ pass
+
+
if __name__ == "__main__":
main()
projects / etc / vim.git / blobdiff