-from dataclasses import dataclass, field
import itertools
import sys
+from dataclasses import dataclass, field
from typing import (
Callable,
Dict,
cast,
)
-from blib2to3.pytree import Node, Leaf
-from blib2to3.pgen2 import token
-
-from black.brackets import BracketTracker, DOT_PRIORITY
+from black.brackets import DOT_PRIORITY, BracketTracker
from black.mode import Mode, Preview
-from black.nodes import STANDALONE_COMMENT, TEST_DESCENDANTS
-from black.nodes import BRACKETS, OPENING_BRACKETS, CLOSING_BRACKETS
-from black.nodes import syms, whitespace, replace_child, child_towards
-from black.nodes import is_multiline_string, is_import, is_type_comment
-from black.nodes import is_one_sequence_between
+from black.nodes import (
+ BRACKETS,
+ CLOSING_BRACKETS,
+ OPENING_BRACKETS,
+ STANDALONE_COMMENT,
+ TEST_DESCENDANTS,
+ child_towards,
+ is_import,
+ is_multiline_string,
+ is_one_sequence_between,
+ is_type_comment,
+ replace_child,
+ syms,
+ whitespace,
+)
+from blib2to3.pgen2 import token
+from blib2to3.pytree import Leaf, Node
# types
T = TypeVar("T")
- it's not a single-element subscript
Additionally, if ensure_removable:
- it's not from square bracket indexing
+ (specifically, single-element square bracket indexing with
+ Preview.skip_magic_trailing_comma_in_subscript)
"""
if not (
closing.type in CLOSING_BRACKETS
if not ensure_removable:
return True
+
comma = self.leaves[-1]
- return bool(comma.parent and comma.parent.type == syms.listmaker)
+ if comma.parent is None:
+ return False
+ if Preview.skip_magic_trailing_comma_in_subscript in self.mode:
+ return (
+ comma.parent.type != syms.subscriptlist
+ or closing.opening_bracket is None
+ or not is_one_sequence_between(
+ closing.opening_bracket,
+ closing,
+ self.leaves,
+ brackets=(token.LSQB, token.RSQB),
+ )
+ )
+ return comma.parent.type == syms.listmaker
if self.is_import:
return True
return bool(self.leaves or self.comments)
+@dataclass
+class LinesBlock:
+ """Class that holds information about a block of formatted lines.
+
+ This is introduced so that the EmptyLineTracker can look behind the standalone
+ comments and adjust their empty lines for class or def lines.
+ """
+
+ mode: Mode
+ previous_block: Optional["LinesBlock"]
+ original_line: Line
+ before: int = 0
+ content_lines: List[str] = field(default_factory=list)
+ after: int = 0
+
+ def all_lines(self) -> List[str]:
+ empty_line = str(Line(mode=self.mode))
+ return (
+ [empty_line * self.before] + self.content_lines + [empty_line * self.after]
+ )
+
+
@dataclass
class EmptyLineTracker:
"""Provides a stateful method that returns the number of potential extra
are consumed by `maybe_empty_lines()` and included in the computation.
"""
- is_pyi: bool = False
+ mode: Mode
previous_line: Optional[Line] = None
- previous_after: int = 0
+ previous_block: Optional[LinesBlock] = None
previous_defs: List[int] = field(default_factory=list)
+ semantic_leading_comment: Optional[LinesBlock] = None
- def maybe_empty_lines(self, current_line: Line) -> Tuple[int, int]:
+ def maybe_empty_lines(self, current_line: Line) -> LinesBlock:
"""Return the number of extra empty lines before and after the `current_line`.
This is for separating `def`, `async def` and `class` with extra empty
lines (two on module-level).
"""
before, after = self._maybe_empty_lines(current_line)
+ previous_after = self.previous_block.after if self.previous_block else 0
before = (
# Black should not insert empty lines at the beginning
# of the file
0
if self.previous_line is None
- else before - self.previous_after
+ else before - previous_after
)
- self.previous_after = after
+ block = LinesBlock(
+ mode=self.mode,
+ previous_block=self.previous_block,
+ original_line=current_line,
+ before=before,
+ after=after,
+ )
+
+ # Maintain the semantic_leading_comment state.
+ if current_line.is_comment:
+ if self.previous_line is None or (
+ not self.previous_line.is_decorator
+ # `or before` means this comment already has an empty line before
+ and (not self.previous_line.is_comment or before)
+ and (self.semantic_leading_comment is None or before)
+ ):
+ self.semantic_leading_comment = block
+ elif not current_line.is_decorator:
+ self.semantic_leading_comment = None
+
self.previous_line = current_line
- return before, after
+ self.previous_block = block
+ return block
def _maybe_empty_lines(self, current_line: Line) -> Tuple[int, int]:
max_allowed = 1
if current_line.depth == 0:
- max_allowed = 1 if self.is_pyi else 2
+ max_allowed = 1 if self.mode.is_pyi else 2
if current_line.leaves:
# Consume the first leaf's extra newlines.
first_leaf = current_line.leaves[0]
before = 0
depth = current_line.depth
while self.previous_defs and self.previous_defs[-1] >= depth:
- if self.is_pyi:
+ if self.mode.is_pyi:
assert self.previous_line is not None
if depth and not current_line.is_def and self.previous_line.is_def:
# Empty lines between attributes and methods should be preserved.
return 0, 0
if self.previous_line.is_decorator:
- if self.is_pyi and current_line.is_stub_class:
+ if self.mode.is_pyi and current_line.is_stub_class:
# Insert an empty line after a decorated stub class
return 0, 1
):
return 0, 0
+ comment_to_add_newlines: Optional[LinesBlock] = None
if (
self.previous_line.is_comment
and self.previous_line.depth == current_line.depth
and before == 0
):
- return 0, 0
+ slc = self.semantic_leading_comment
+ if (
+ Preview.empty_lines_before_class_or_def_with_leading_comments
+ in current_line.mode
+ and slc is not None
+ and slc.previous_block is not None
+ and not slc.previous_block.original_line.is_class
+ and not slc.previous_block.original_line.opens_block
+ and slc.before <= 1
+ ):
+ comment_to_add_newlines = slc
+ else:
+ return 0, 0
- if self.is_pyi:
+ if self.mode.is_pyi:
if current_line.is_class or self.previous_line.is_class:
if self.previous_line.depth < current_line.depth:
newlines = 0
newlines = 0
else:
newlines = 1 if current_line.depth else 2
+ if comment_to_add_newlines is not None:
+ previous_block = comment_to_add_newlines.previous_block
+ if previous_block is not None:
+ comment_to_add_newlines.before = (
+ max(comment_to_add_newlines.before, newlines) - previous_block.after
+ )
+ newlines = 0
return newlines, 0
projects / etc / vim.git / blobdiff