X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/6c3ce53b60b68ca2b532935aeee89729f0bd9fd9..91e99b27e114cfb75ac4d1f874c5f9cf0b0a91f2:/black.py?ds=sidebyside
diff --git a/black.py b/black.py
index 89155f6..9ea4694 100644
--- a/black.py
+++ b/black.py
@@ -1,4 +1,5 @@
#!/usr/bin/env python3
+
import asyncio
from asyncio.base_events import BaseEventLoop
from concurrent.futures import Executor, ProcessPoolExecutor
@@ -9,7 +10,7 @@ from pathlib import Path
import tokenize
import sys
from typing import (
- Dict, Generic, Iterable, Iterator, List, Optional, Set, Tuple, TypeVar, Union
+ Dict, Generic, Iterable, Iterator, List, Optional, Set, Tuple, Type, TypeVar, Union
)
from attr import dataclass, Factory
@@ -21,7 +22,7 @@ from blib2to3 import pygram, pytree
from blib2to3.pgen2 import driver, token
from blib2to3.pgen2.parse import ParseError
-__version__ = "18.3a2"
+__version__ = "18.3a4"
DEFAULT_LINE_LENGTH = 88
# types
syms = pygram.python_symbols
@@ -43,9 +44,37 @@ class NothingChanged(UserWarning):
class CannotSplit(Exception):
"""A readable split that fits the allotted line length is impossible.
- Raised by `left_hand_split()` and `right_hand_split()`.
+ Raised by `left_hand_split()`, `right_hand_split()`, and `delimiter_split()`.
+ """
+
+
+class FormatError(Exception):
+ """Base fmt: on/off error.
+
+ It holds the number of bytes of the prefix consumed before the format
+ control comment appeared.
"""
+ def __init__(self, consumed: int) -> None:
+ super().__init__(consumed)
+ self.consumed = consumed
+
+ def trim_prefix(self, leaf: Leaf) -> None:
+ leaf.prefix = leaf.prefix[self.consumed:]
+
+ def leaf_from_consumed(self, leaf: Leaf) -> Leaf:
+ """Returns a new Leaf from the consumed part of the prefix."""
+ unformatted_prefix = leaf.prefix[:self.consumed]
+ return Leaf(token.NEWLINE, unformatted_prefix)
+
+
+class FormatOn(FormatError):
+ """Found a comment like `# fmt: on` in the file."""
+
+
+class FormatOff(FormatError):
+ """Found a comment like `# fmt: off` in the file."""
+
@click.command()
@click.option(
@@ -61,7 +90,7 @@ class CannotSplit(Exception):
is_flag=True,
help=(
"Don't write back the files, just return the status. Return code 0 "
- "means nothing changed. Return code 1 means some files were "
+ "means nothing would change. Return code 1 means some files would be "
"reformatted. Return code 123 means there was an internal error."
),
)
@@ -74,7 +103,9 @@ class CannotSplit(Exception):
@click.argument(
'src',
nargs=-1,
- type=click.Path(exists=True, file_okay=True, dir_okay=True, readable=True),
+ type=click.Path(
+ exists=True, file_okay=True, dir_okay=True, readable=True, allow_dash=True
+ ),
)
@click.pass_context
def main(
@@ -89,17 +120,24 @@ def main(
elif p.is_file():
# if a file was explicitly given, we don't care about its extension
sources.append(p)
+ elif s == '-':
+ sources.append(Path('-'))
else:
err(f'invalid path: {s}')
if len(sources) == 0:
ctx.exit(0)
elif len(sources) == 1:
p = sources[0]
- report = Report()
+ report = Report(check=check)
try:
- changed = format_file_in_place(
- p, line_length=line_length, fast=fast, write_back=not check
- )
+ if not p.is_file() and str(p) == '-':
+ changed = format_stdin_to_stdout(
+ line_length=line_length, fast=fast, write_back=not check
+ )
+ else:
+ changed = format_file_in_place(
+ p, line_length=line_length, fast=fast, write_back=not check
+ )
report.done(p, changed)
except Exception as exc:
report.failed(p, str(exc))
@@ -156,41 +194,59 @@ def format_file_in_place(
src: Path, line_length: int, fast: bool, write_back: bool = False
) -> bool:
"""Format the file and rewrite if changed. Return True if changed."""
+ with tokenize.open(src) as src_buffer:
+ src_contents = src_buffer.read()
try:
- contents, encoding = format_file(src, line_length=line_length, fast=fast)
+ contents = format_file_contents(
+ src_contents, line_length=line_length, fast=fast
+ )
except NothingChanged:
return False
if write_back:
- with open(src, "w", encoding=encoding) as f:
+ with open(src, "w", encoding=src_buffer.encoding) as f:
f.write(contents)
return True
-def format_file(
- src: Path, line_length: int, fast: bool
-) -> Tuple[FileContent, Encoding]:
+def format_stdin_to_stdout(
+ line_length: int, fast: bool, write_back: bool = False
+) -> bool:
+ """Format file on stdin and pipe output to stdout. Return True if changed."""
+ contents = sys.stdin.read()
+ try:
+ contents = format_file_contents(contents, line_length=line_length, fast=fast)
+ return True
+
+ except NothingChanged:
+ return False
+
+ finally:
+ if write_back:
+ sys.stdout.write(contents)
+
+
+def format_file_contents(
+ src_contents: str, line_length: int, fast: bool
+) -> FileContent:
"""Reformats a file and returns its contents and encoding."""
- with tokenize.open(src) as src_buffer:
- src_contents = src_buffer.read()
if src_contents.strip() == '':
- raise NothingChanged(src)
+ raise NothingChanged
dst_contents = format_str(src_contents, line_length=line_length)
if src_contents == dst_contents:
- raise NothingChanged(src)
+ raise NothingChanged
if not fast:
assert_equivalent(src_contents, dst_contents)
assert_stable(src_contents, dst_contents, line_length=line_length)
- return dst_contents, src_buffer.encoding
+ return dst_contents
def format_str(src_contents: str, line_length: int) -> FileContent:
"""Reformats a string and returns new contents."""
src_node = lib2to3_parse(src_contents)
dst_contents = ""
- comments: List[Line] = []
lines = LineGenerator()
elt = EmptyLineTracker()
py36 = is_python36(src_node)
@@ -202,41 +258,41 @@ def format_str(src_contents: str, line_length: int) -> FileContent:
before, after = elt.maybe_empty_lines(current_line)
for _ in range(before):
dst_contents += str(empty_line)
- if not current_line.is_comment:
- for comment in comments:
- dst_contents += str(comment)
- comments = []
- for line in split_line(current_line, line_length=line_length, py36=py36):
- dst_contents += str(line)
- else:
- comments.append(current_line)
- if comments:
- if elt.previous_defs:
- # Separate postscriptum comments from the last module-level def.
- dst_contents += str(empty_line)
- dst_contents += str(empty_line)
- for comment in comments:
- dst_contents += str(comment)
+ for line in split_line(current_line, line_length=line_length, py36=py36):
+ dst_contents += str(line)
return dst_contents
+GRAMMARS = [
+ pygram.python_grammar_no_print_statement_no_exec_statement,
+ pygram.python_grammar_no_print_statement,
+ pygram.python_grammar_no_exec_statement,
+ pygram.python_grammar,
+]
+
+
def lib2to3_parse(src_txt: str) -> Node:
"""Given a string with source, return the lib2to3 Node."""
grammar = pygram.python_grammar_no_print_statement
- drv = driver.Driver(grammar, pytree.convert)
if src_txt[-1] != '\n':
nl = '\r\n' if '\r\n' in src_txt[:1024] else '\n'
src_txt += nl
- try:
- result = drv.parse_string(src_txt, True)
- except ParseError as pe:
- lineno, column = pe.context[1]
- lines = src_txt.splitlines()
+ for grammar in GRAMMARS:
+ drv = driver.Driver(grammar, pytree.convert)
try:
- faulty_line = lines[lineno - 1]
- except IndexError:
- faulty_line = "<line number missing in source>"
- raise ValueError(f"Cannot parse: {lineno}:{column}: {faulty_line}") from None
+ result = drv.parse_string(src_txt, True)
+ break
+
+ except ParseError as pe:
+ lineno, column = pe.context[1]
+ lines = src_txt.splitlines()
+ try:
+ faulty_line = lines[lineno - 1]
+ except IndexError:
+ faulty_line = "<line number missing in source>"
+ exc = ValueError(f"Cannot parse: {lineno}:{column}: {faulty_line}")
+ else:
+ raise exc from None
if isinstance(result, Leaf):
result = Node(syms.file_input, [result])
@@ -292,6 +348,15 @@ class DebugVisitor(Visitor[T]):
out(f' {node.prefix!r}', fg='green', bold=False, nl=False)
out(f' {node.value!r}', fg='blue', bold=False)
+ @classmethod
+ def show(cls, code: str) -> None:
+ """Pretty-prints a given string of `code`.
+
+ Convenience method for debugging.
+ """
+ v: DebugVisitor[None] = DebugVisitor()
+ list(v.visit(lib2to3_parse(code)))
+
KEYWORDS = set(keyword.kwlist)
WHITESPACE = {token.DEDENT, token.INDENT, token.NEWLINE}
@@ -325,6 +390,7 @@ MATH_OPERATORS = {
token.AMPER,
token.PERCENT,
token.CIRCUMFLEX,
+ token.TILDE,
token.LEFTSHIFT,
token.RIGHTSHIFT,
token.DOUBLESTAR,
@@ -390,7 +456,7 @@ class BracketTracker:
"""Returns True if there is an yet unmatched open bracket on the line."""
return bool(self.bracket_match)
- def max_priority(self, exclude: Iterable[LeafID] =()) -> int:
+ def max_priority(self, exclude: Iterable[LeafID] = ()) -> int:
"""Returns the highest priority of a delimiter found on the line.
Values are consistent with what `is_delimiter()` returns.
@@ -463,8 +529,7 @@ class Line:
return (
(first_leaf.type == token.NAME and first_leaf.value == 'def')
or (
- first_leaf.type == token.NAME
- and first_leaf.value == 'async'
+ first_leaf.type == token.ASYNC
and second_leaf is not None
and second_leaf.type == token.NAME
and second_leaf.value == 'def'
@@ -495,10 +560,16 @@ class Line:
):
return False
- if closing.type == token.RSQB or closing.type == token.RBRACE:
+ if closing.type == token.RBRACE:
self.leaves.pop()
return True
+ if closing.type == token.RSQB:
+ comma = self.leaves[-1]
+ if comma.parent and comma.parent.type == syms.listmaker:
+ self.leaves.pop()
+ return True
+
# For parens let's check if it's safe to remove the comma. If the
# trailing one is the only one, we might mistakenly change a tuple
# into a different type by removing the comma.
@@ -615,6 +686,43 @@ class Line:
return bool(self.leaves or self.comments)
+class UnformattedLines(Line):
+
+ def append(self, leaf: Leaf, preformatted: bool = False) -> None:
+ try:
+ list(generate_comments(leaf))
+ except FormatOn as f_on:
+ self.leaves.append(f_on.leaf_from_consumed(leaf))
+ raise
+
+ self.leaves.append(leaf)
+ if leaf.type == token.INDENT:
+ self.depth += 1
+ elif leaf.type == token.DEDENT:
+ self.depth -= 1
+
+ def append_comment(self, comment: Leaf) -> bool:
+ raise NotImplementedError("Unformatted lines don't store comments separately.")
+
+ def maybe_remove_trailing_comma(self, closing: Leaf) -> bool:
+ return False
+
+ def maybe_increment_for_loop_variable(self, leaf: Leaf) -> bool:
+ return False
+
+ def maybe_adapt_standalone_comment(self, comment: Leaf) -> bool:
+ return False
+
+ def __str__(self) -> str:
+ if not self:
+ return '\n'
+
+ res = ''
+ for leaf in self.leaves:
+ res += str(leaf)
+ return res
+
+
@dataclass
class EmptyLineTracker:
"""Provides a stateful method that returns the number of potential extra
@@ -635,8 +743,7 @@ class EmptyLineTracker:
(two on module-level), as well as providing an extra empty line after flow
control keywords to make them more prominent.
"""
- if current_line.is_comment:
- # Don't count standalone comments towards previous empty lines.
+ if isinstance(current_line, UnformattedLines):
return 0, 0
before, after = self._maybe_empty_lines(current_line)
@@ -646,10 +753,14 @@ class EmptyLineTracker:
return before, after
def _maybe_empty_lines(self, current_line: Line) -> Tuple[int, int]:
+ max_allowed = 1
+ if current_line.is_comment and current_line.depth == 0:
+ max_allowed = 2
if current_line.leaves:
# Consume the first leaf's extra newlines.
first_leaf = current_line.leaves[0]
- before = int('\n' in first_leaf.prefix)
+ before = first_leaf.prefix.count('\n')
+ before = min(before, max(before, max_allowed))
first_leaf.prefix = ''
else:
before = 0
@@ -703,9 +814,8 @@ class LineGenerator(Visitor[Line]):
in ways that will no longer stringify to valid Python code on the tree.
"""
current_line: Line = Factory(Line)
- standalone_comments: List[Leaf] = Factory(list)
- def line(self, indent: int = 0) -> Iterator[Line]:
+ def line(self, indent: int = 0, type: Type[Line] = Line) -> Iterator[Line]:
"""Generate a line.
If the line is empty, only emit if it makes sense.
@@ -714,52 +824,68 @@ class LineGenerator(Visitor[Line]):
If any lines were generated, set up a new current_line.
"""
if not self.current_line:
- self.current_line.depth += indent
+ if self.current_line.__class__ == type:
+ self.current_line.depth += indent
+ else:
+ self.current_line = type(depth=self.current_line.depth + indent)
return # Line is empty, don't emit. Creating a new one unnecessary.
complete_line = self.current_line
- self.current_line = Line(depth=complete_line.depth + indent)
+ self.current_line = type(depth=complete_line.depth + indent)
yield complete_line
+ def visit(self, node: LN) -> Iterator[Line]:
+ """High-level entry point to the visitor."""
+ if isinstance(self.current_line, UnformattedLines):
+ # File contained `# fmt: off`
+ yield from self.visit_unformatted(node)
+
+ else:
+ yield from super().visit(node)
+
def visit_default(self, node: LN) -> Iterator[Line]:
if isinstance(node, Leaf):
- for comment in generate_comments(node):
- if self.current_line.bracket_tracker.any_open_brackets():
- # any comment within brackets is subject to splitting
- self.current_line.append(comment)
- elif comment.type == token.COMMENT:
- # regular trailing comment
- self.current_line.append(comment)
- yield from self.line()
-
- else:
- # regular standalone comment, to be processed later (see
- # docstring in `generate_comments()`
- self.standalone_comments.append(comment)
- normalize_prefix(node)
- if node.type not in WHITESPACE:
- for comment in self.standalone_comments:
- yield from self.line()
-
- self.current_line.append(comment)
- yield from self.line()
-
- self.standalone_comments = []
- self.current_line.append(node)
+ any_open_brackets = self.current_line.bracket_tracker.any_open_brackets()
+ try:
+ for comment in generate_comments(node):
+ if any_open_brackets:
+ # any comment within brackets is subject to splitting
+ self.current_line.append(comment)
+ elif comment.type == token.COMMENT:
+ # regular trailing comment
+ self.current_line.append(comment)
+ yield from self.line()
+
+ else:
+ # regular standalone comment
+ yield from self.line()
+
+ self.current_line.append(comment)
+ yield from self.line()
+
+ except FormatOff as f_off:
+ f_off.trim_prefix(node)
+ yield from self.line(type=UnformattedLines)
+ yield from self.visit(node)
+
+ except FormatOn as f_on:
+ # This only happens here if somebody says "fmt: on" multiple
+ # times in a row.
+ f_on.trim_prefix(node)
+ yield from self.visit_default(node)
+
+ else:
+ normalize_prefix(node, inside_brackets=any_open_brackets)
+ if node.type not in WHITESPACE:
+ self.current_line.append(node)
yield from super().visit_default(node)
- def visit_suite(self, node: Node) -> Iterator[Line]:
- """Body of a statement after a colon."""
- children = iter(node.children)
- # Process newline before indenting. It might contain an inline
- # comment that should go right after the colon.
- newline = next(children)
- yield from self.visit(newline)
+ def visit_INDENT(self, node: Node) -> Iterator[Line]:
yield from self.line(+1)
+ yield from self.visit_default(node)
- for child in children:
- yield from self.visit(child)
-
+ def visit_DEDENT(self, node: Node) -> Iterator[Line]:
+ # DEDENT has no value. Additionally, in blib2to3 it never holds comments.
yield from self.line(-1)
def visit_stmt(self, node: Node, keywords: Set[str]) -> Iterator[Line]:
@@ -793,7 +919,7 @@ class LineGenerator(Visitor[Line]):
for child in children:
yield from self.visit(child)
- if child.type == token.NAME and child.value == 'async': # type: ignore
+ if child.type == token.ASYNC:
break
internal_stmt = next(children)
@@ -812,6 +938,19 @@ class LineGenerator(Visitor[Line]):
yield from self.visit_default(leaf)
yield from self.line()
+ def visit_unformatted(self, node: LN) -> Iterator[Line]:
+ if isinstance(node, Node):
+ for child in node.children:
+ yield from self.visit(child)
+
+ else:
+ try:
+ self.current_line.append(node)
+ except FormatOn as f_on:
+ f_on.trim_prefix(node)
+ yield from self.line()
+ yield from self.visit(node)
+
def __attrs_post_init__(self) -> None:
"""You are in a twisty little maze of passages."""
v = self.visit_stmt
@@ -831,7 +970,7 @@ BRACKET = {token.LPAR: token.RPAR, token.LSQB: token.RSQB, token.LBRACE: token.R
OPENING_BRACKETS = set(BRACKET.keys())
CLOSING_BRACKETS = set(BRACKET.values())
BRACKETS = OPENING_BRACKETS | CLOSING_BRACKETS
-ALWAYS_NO_SPACE = CLOSING_BRACKETS | {token.COMMA, token.COLON, STANDALONE_COMMENT}
+ALWAYS_NO_SPACE = CLOSING_BRACKETS | {token.COMMA, STANDALONE_COMMENT}
def whitespace(leaf: Leaf) -> str: # noqa C901
@@ -849,37 +988,62 @@ def whitespace(leaf: Leaf) -> str: # noqa C901
return DOUBLESPACE
assert p is not None, f"INTERNAL ERROR: hand-made leaf without parent: {leaf!r}"
+ if t == token.COLON and p.type not in {syms.subscript, syms.subscriptlist}:
+ return NO
+
prev = leaf.prev_sibling
if not prev:
prevp = preceding_leaf(p)
if not prevp or prevp.type in OPENING_BRACKETS:
return NO
+ if t == token.COLON:
+ return SPACE if prevp.type == token.COMMA else NO
+
if prevp.type == token.EQUAL:
- if prevp.parent and prevp.parent.type in {
- syms.typedargslist,
- syms.varargslist,
- syms.parameters,
- syms.arglist,
- syms.argument,
- }:
- return NO
+ if prevp.parent:
+ if prevp.parent.type in {
+ syms.arglist, syms.argument, syms.parameters, syms.varargslist
+ }:
+ return NO
+
+ elif prevp.parent.type == syms.typedargslist:
+ # A bit hacky: if the equal sign has whitespace, it means we
+ # previously found it's a typed argument. So, we're using
+ # that, too.
+ return prevp.prefix
elif prevp.type == token.DOUBLESTAR:
if prevp.parent and prevp.parent.type in {
- syms.typedargslist,
- syms.varargslist,
- syms.parameters,
syms.arglist,
+ syms.argument,
syms.dictsetmaker,
+ syms.parameters,
+ syms.typedargslist,
+ syms.varargslist,
}:
return NO
elif prevp.type == token.COLON:
- if prevp.parent and prevp.parent.type == syms.subscript:
+ if prevp.parent and prevp.parent.type in {syms.subscript, syms.sliceop}:
return NO
- elif prevp.parent and prevp.parent.type in {syms.factor, syms.star_expr}:
+ elif (
+ prevp.parent
+ and prevp.parent.type in {syms.factor, syms.star_expr}
+ and prevp.type in MATH_OPERATORS
+ ):
+ return NO
+
+ elif (
+ prevp.type == token.RIGHTSHIFT
+ and prevp.parent
+ and prevp.parent.type == syms.shift_expr
+ and prevp.prev_sibling
+ and prevp.prev_sibling.type == token.NAME
+ and prevp.prev_sibling.value == 'print' # type: ignore
+ ):
+ # Python 2 print chevron
return NO
elif prev.type in OPENING_BRACKETS:
@@ -893,7 +1057,7 @@ def whitespace(leaf: Leaf) -> str: # noqa C901
if not prev or prev.type != token.COMMA:
return NO
- if p.type == syms.varargslist:
+ elif p.type == syms.varargslist:
# lambdas
if t == token.RPAR:
return NO
@@ -983,7 +1147,7 @@ def whitespace(leaf: Leaf) -> str: # noqa C901
return NO
- elif prev.type == token.COLON:
+ else:
return NO
elif p.type == syms.atom:
@@ -1104,30 +1268,49 @@ def generate_comments(leaf: Leaf) -> Iterator[Leaf]:
Inline comments are emitted as regular token.COMMENT leaves. Standalone
are emitted with a fake STANDALONE_COMMENT token identifier.
"""
- if not leaf.prefix:
+ p = leaf.prefix
+ if not p:
return
- if '#' not in leaf.prefix:
+ if '#' not in p:
return
- before_comment, content = leaf.prefix.split('#', 1)
- content = content.rstrip()
- if content and (content[0] not in {' ', '!', '#'}):
- content = ' ' + content
- is_standalone_comment = (
- '\n' in before_comment or '\n' in content or leaf.type == token.DEDENT
- )
- if not is_standalone_comment:
- # simple trailing comment
- yield Leaf(token.COMMENT, value='#' + content)
- return
-
- for line in ('#' + content).split('\n'):
+ consumed = 0
+ nlines = 0
+ for index, line in enumerate(p.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('#'):
continue
- yield Leaf(STANDALONE_COMMENT, line)
+ if index == 0 and leaf.type != token.ENDMARKER:
+ comment_type = token.COMMENT # simple trailing comment
+ else:
+ comment_type = STANDALONE_COMMENT
+ comment = make_comment(line)
+ yield Leaf(comment_type, comment, prefix='\n' * nlines)
+
+ if comment in {'# fmt: on', '# yapf: enable'}:
+ raise FormatOn(consumed)
+
+ if comment in {'# fmt: off', '# yapf: disable'}:
+ raise FormatOff(consumed)
+
+ nlines = 0
+
+
+def make_comment(content: str) -> str:
+ content = content.rstrip()
+ if not content:
+ return '#'
+
+ if content[0] == '#':
+ content = content[1:]
+ if content and content[0] not in ' !:#':
+ content = ' ' + content
+ return '#' + content
def split_line(
@@ -1143,6 +1326,10 @@ def split_line(
If `py36` is True, splitting may generate syntax that is only compatible
with Python 3.6 and later.
"""
+ if isinstance(line, UnformattedLines):
+ yield line
+ return
+
line_str = str(line).strip('\n')
if len(line_str) <= line_length and '\n' not in line_str:
yield line
@@ -1210,7 +1397,7 @@ def left_hand_split(line: Line, py36: bool = False) -> Iterator[Line]:
current_leaves = body_leaves
# Since body is a new indent level, remove spurious leading whitespace.
if body_leaves:
- normalize_prefix(body_leaves[0])
+ 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)
@@ -1250,7 +1437,7 @@ def right_hand_split(line: Line, py36: bool = False) -> Iterator[Line]:
head_leaves.reverse()
# Since body is a new indent level, remove spurious leading whitespace.
if body_leaves:
- normalize_prefix(body_leaves[0])
+ 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)
@@ -1314,7 +1501,7 @@ def delimiter_split(line: Line, py36: bool = False) -> Iterator[Line]:
trailing_comma_safe = trailing_comma_safe and py36
leaf_priority = delimiters.get(id(leaf))
if leaf_priority == delimiter_priority:
- normalize_prefix(current_line.leaves[0])
+ normalize_prefix(current_line.leaves[0], inside_brackets=True)
yield current_line
current_line = Line(depth=line.depth, inside_brackets=line.inside_brackets)
@@ -1325,7 +1512,7 @@ def delimiter_split(line: Line, py36: bool = False) -> Iterator[Line]:
and trailing_comma_safe
):
current_line.append(Leaf(token.COMMA, ','))
- normalize_prefix(current_line.leaves[0])
+ normalize_prefix(current_line.leaves[0], inside_brackets=True)
yield current_line
@@ -1343,13 +1530,20 @@ def is_import(leaf: Leaf) -> bool:
)
-def normalize_prefix(leaf: Leaf) -> None:
- """Leave existing extra newlines for imports. Remove everything else."""
- if is_import(leaf):
- spl = leaf.prefix.split('#', 1)
- nl_count = spl[0].count('\n')
- leaf.prefix = '\n' * nl_count
- return
+def normalize_prefix(leaf: Leaf, *, inside_brackets: bool) -> None:
+ """Leave existing extra newlines if not `inside_brackets`.
+
+ Remove everything else. Note: don't use backslashes for formatting or
+ you'll lose your voting rights.
+ """
+ if not inside_brackets:
+ spl = leaf.prefix.split('#')
+ if '\\' not in spl[0]:
+ nl_count = spl[-1].count('\n')
+ if len(spl) > 1:
+ nl_count -= 1
+ leaf.prefix = '\n' * nl_count
+ return
leaf.prefix = ''
@@ -1400,6 +1594,7 @@ def gen_python_files_in_dir(path: Path) -> Iterator[Path]:
@dataclass
class Report:
"""Provides a reformatting counter."""
+ check: bool = False
change_count: int = 0
same_count: int = 0
failure_count: int = 0
@@ -1407,7 +1602,8 @@ class Report:
def done(self, src: Path, changed: bool) -> None:
"""Increment the counter for successful reformatting. Write out a message."""
if changed:
- out(f'reformatted {src}')
+ reformatted = 'would reformat' if self.check else 'reformatted'
+ out(f'{reformatted} {src}')
self.change_count += 1
else:
out(f'{src} already well formatted, good job.', bold=False)
@@ -1426,7 +1622,7 @@ class Report:
if self.failure_count:
return 123
- elif self.change_count:
+ elif self.change_count and self.check:
return 1
return 0
@@ -1436,21 +1632,27 @@ class Report:
Use `click.unstyle` to remove colors.
"""
+ if self.check:
+ reformatted = "would be reformatted"
+ unchanged = "would be left unchanged"
+ failed = "would fail to reformat"
+ else:
+ reformatted = "reformatted"
+ unchanged = "left unchanged"
+ failed = "failed to reformat"
report = []
if self.change_count:
s = 's' if self.change_count > 1 else ''
report.append(
- click.style(f'{self.change_count} file{s} reformatted', bold=True)
+ click.style(f'{self.change_count} file{s} {reformatted}', bold=True)
)
if self.same_count:
s = 's' if self.same_count > 1 else ''
- report.append(f'{self.same_count} file{s} left unchanged')
+ report.append(f'{self.same_count} file{s} {unchanged}')
if self.failure_count:
s = 's' if self.failure_count > 1 else ''
report.append(
- click.style(
- f'{self.failure_count} file{s} failed to reformat', fg='red'
- )
+ click.style(f'{self.failure_count} file{s} {failed}', fg='red')
)
return ', '.join(report) + '.'
@@ -1492,7 +1694,12 @@ def assert_equivalent(src: str, dst: str) -> None:
try:
src_ast = ast.parse(src)
except Exception as exc:
- raise AssertionError(f"cannot parse source: {exc}") from None
+ 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}"
+ )
try:
dst_ast = ast.parse(dst)