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Use the separate pass for # fmt: off on all code

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This removes the hacky exception-based handling that didn't work across
statement boundaries.

Fixes #335
This commit is contained in:
Łukasz Langa 2018-06-19 17:32:41 -07:00
parent 8a8c58252c
commit df2ae3bbe6
4 changed files with 102 additions and 177 deletions
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6
README.md
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@ -824,7 +824,11 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md).
* typing stub files (`.pyi`) now have blank lines added after constants (#340)
* `# fmt: off` and `# fmt: on` now work also within bracket pairs (#329)
* `# fmt: off` and `# fmt: on` are now much more dependable:
* they now work also within bracket pairs (#329)
* they now correctly work across function/class boundaries (#335)
* fixed improper formatting of f-strings with quotes inside interpolated
expressions (#322)

192
black.py
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@ -29,7 +29,6 @@
Sequence,
Set,
Tuple,
Type,
TypeVar,
Union,
cast,
@ -90,34 +89,6 @@ class CannotSplit(Exception):
"""
class FormatError(Exception):
"""Base exception for `# fmt: on` and `# fmt: off` handling.
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."""
class WriteBack(Enum):
NO = 0
YES = 1
@ -759,13 +730,15 @@ def visit_default(self, node: LN) -> Iterator[T]:
out(f" {node.value!r}", fg="blue", bold=False)
@classmethod
def show(cls, code: str) -> None:
def show(cls, code: Union[str, Leaf, Node]) -> None:
"""Pretty-print the lib2to3 AST of a given string of `code`.
Convenience method for debugging.
"""
v: DebugVisitor[None] = DebugVisitor()
list(v.visit(lib2to3_parse(code)))
if isinstance(code, str):
code = lib2to3_parse(code)
list(v.visit(code))
KEYWORDS = set(keyword.kwlist)
@ -1306,55 +1279,6 @@ def __bool__(self) -> bool:
return bool(self.leaves or self.comments)
class UnformattedLines(Line):
"""Just like :class:`Line` but stores lines which aren't reformatted."""
def append(self, leaf: Leaf, preformatted: bool = True) -> None:
"""Just add a new `leaf` to the end of the lines.
The `preformatted` argument is ignored.
Keeps track of indentation `depth`, which is useful when the user
says `# fmt: on`. Otherwise, doesn't do anything with the `leaf`.
"""
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 __str__(self) -> str:
"""Render unformatted lines from leaves which were added with `append()`.
`depth` is not used for indentation in this case.
"""
if not self:
return "\n"
res = ""
for leaf in self.leaves:
res += str(leaf)
return res
def append_comment(self, comment: Leaf) -> bool:
"""Not implemented in this class. Raises `NotImplementedError`."""
raise NotImplementedError("Unformatted lines don't store comments separately.")
def maybe_remove_trailing_comma(self, closing: Leaf) -> bool:
"""Does nothing and returns False."""
return False
def maybe_increment_for_loop_variable(self, leaf: Leaf) -> bool:
"""Does nothing and returns False."""
return False
@dataclass
class EmptyLineTracker:
"""Provides a stateful method that returns the number of potential extra
@ -1376,9 +1300,6 @@ def maybe_empty_lines(self, current_line: Line) -> Tuple[int, int]:
This is for separating `def`, `async def` and `class` with extra empty
lines (two on module-level).
"""
if isinstance(current_line, UnformattedLines):
return 0, 0
before, after = self._maybe_empty_lines(current_line)
before -= self.previous_after
self.previous_after = after
@ -1482,7 +1403,7 @@ class LineGenerator(Visitor[Line]):
current_line: Line = Factory(Line)
remove_u_prefix: bool = False
def line(self, indent: int = 0, type: Type[Line] = Line) -> Iterator[Line]:
def line(self, indent: int = 0) -> Iterator[Line]:
"""Generate a line.
If the line is empty, only emit if it makes sense.
@ -1491,33 +1412,17 @@ def line(self, indent: int = 0, type: Type[Line] = Line) -> Iterator[Line]:
If any lines were generated, set up a new current_line.
"""
if not self.current_line:
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 = type(depth=complete_line.depth + indent)
self.current_line = Line(depth=complete_line.depth + indent)
yield complete_line
def visit(self, node: LN) -> Iterator[Line]:
"""Main method to visit `node` and its children.
Yields :class:`Line` objects.
"""
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]:
"""Default `visit_*()` implementation. Recurses to children of `node`."""
if isinstance(node, Leaf):
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
@ -1534,18 +1439,6 @@ def visit_default(self, node: LN) -> Iterator[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 self.normalize_strings and node.type == token.STRING:
normalize_string_prefix(node, remove_u_prefix=self.remove_u_prefix)
@ -1648,23 +1541,10 @@ def visit_ENDMARKER(self, leaf: Leaf) -> Iterator[Line]:
yield from self.visit_default(leaf)
yield from self.line()
def visit_unformatted(self, node: LN) -> Iterator[Line]:
"""Used when file contained a `# fmt: off`."""
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)
if node.type == token.ENDMARKER:
# somebody decided not to put a final `# fmt: on`
def visit_STANDALONE_COMMENT(self, leaf: Leaf) -> Iterator[Line]:
if not self.current_line.bracket_tracker.any_open_brackets():
yield from self.line()
yield from self.visit_default(leaf)
def __attrs_post_init__(self) -> None:
"""You are in a twisty little maze of passages."""
@ -1969,6 +1849,9 @@ def container_of(leaf: Leaf) -> LN:
if parent.children[0].prefix != same_prefix:
break
if parent.type == syms.file_input:
break
if parent.type in SURROUNDED_BY_BRACKETS:
break
@ -2106,16 +1989,6 @@ def generate_comments(leaf: LN) -> Iterator[Leaf]:
"""
for pc in list_comments(leaf.prefix, is_endmarker=leaf.type == token.ENDMARKER):
yield Leaf(pc.type, pc.value, prefix="\n" * pc.newlines)
if pc.value in FMT_ON:
raise FormatOn(pc.consumed)
if pc.value in FMT_OFF:
if pc.type == STANDALONE_COMMENT:
raise FormatOff(pc.consumed)
prev = preceding_leaf(leaf)
if not prev or prev.type in WHITESPACE: # standalone comment in disguise
raise FormatOff(pc.consumed)
@dataclass
@ -2188,7 +2061,7 @@ 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) or line.is_comment:
if line.is_comment:
yield line
return
@ -2680,28 +2553,29 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
def normalize_fmt_off(node: Node) -> None:
"""Allow `# fmt: off`/`# fmt: on` within bracket pairs.
Ignores `# fmt: off` and `# fmt: on` outside of brackets.
Raises :exc:`SyntaxError` if no matching `# fmt: on` is found for a `# fmt: off`
given inside brackets.
"""
"""Convert content between `# fmt: off`/`# fmt: on` into standalone comments."""
try_again = True
while try_again:
try_again = hide_fmt_off(node)
try_again = convert_one_fmt_off_pair(node)
def hide_fmt_off(node: Node) -> bool:
bt = BracketTracker()
def convert_one_fmt_off_pair(node: Node) -> bool:
"""Convert content of a single `# fmt: off`/`# fmt: on` into a standalone comment.
Returns True if a pair was converted.
"""
for leaf in node.leaves():
bt.mark(leaf)
if bt.depth == 0:
continue
previous_consumed = 0
for comment in list_comments(leaf.prefix, is_endmarker=False):
if comment.value in FMT_OFF:
# We only want standalone comments. If there's no previous leaf or
# the previous leaf is indentation, it's a standalone comment in
# disguise.
if comment.type != STANDALONE_COMMENT:
prev = preceding_leaf(leaf)
if prev and prev.type not in WHITESPACE:
continue
ignored_nodes = list(generate_ignored_nodes(leaf))
first = ignored_nodes[0] # Can be a container node with the `leaf`.
parent = first.parent
@ -2710,6 +2584,10 @@ def hide_fmt_off(node: Node) -> bool:
hidden_value = (
comment.value + "\n" + "".join(str(n) for n in ignored_nodes)
)
if hidden_value.endswith("\n"):
# 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
for ignored in ignored_nodes:
index = ignored.remove()
@ -2733,8 +2611,12 @@ def hide_fmt_off(node: Node) -> bool:
def generate_ignored_nodes(leaf: Leaf) -> Iterator[LN]:
"""Starting from the container of `leaf`, generate all leaves until `# fmt: on`.
Stops at the end of the block.
"""
container: Optional[LN] = container_of(leaf)
while container is not None:
while container is not None and container.type != token.ENDMARKER:
for comment in list_comments(container.prefix, is_endmarker=False):
if comment.value in FMT_ON:
return

31
tests/data/fmtonoff2.py Normal file
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@ -0,0 +1,31 @@
import pytest
TmSt = 1
TmEx = 2
# fmt: off
# Test data:
# Position, Volume, State, TmSt/TmEx/None, [call, [arg1...]]
@pytest.mark.parametrize('test', [
# Test don't manage the volume
[
('stuff', 'in')
],
])
def test_fader(test):
pass
def check_fader(test):
pass
def test_calculate_fades():
calcs = [
# one is zero/none
(0, 4, 0, 0, 10, 0, 0, 6, 10),
(None, 4, 0, 0, 10, 0, 0, 6, 10),
]
# fmt: on

8
tests/test_black.py
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@ -400,6 +400,14 @@ def test_fmtonoff(self) -> None:
black.assert_equivalent(source, actual)
black.assert_stable(source, actual, line_length=ll)
@patch("black.dump_to_file", dump_to_stderr)
def test_fmtonoff2(self) -> None:
source, expected = read_data("fmtonoff2")
actual = fs(source)
self.assertFormatEqual(expected, actual)
black.assert_equivalent(source, actual)
black.assert_stable(source, actual, line_length=ll)
@patch("black.dump_to_file", dump_to_stderr)
def test_remove_empty_parentheses_after_class(self) -> None:
source, expected = read_data("class_blank_parentheses")