import sys
from typing import (
Callable,
- Collection,
Dict,
Iterator,
List,
from blib2to3.pgen2 import token
from black.brackets import BracketTracker, DOT_PRIORITY
-from black.mode import Mode
+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, last_two_except
-from black.nodes import is_one_tuple_between
+from black.nodes import is_multiline_string, is_import, is_type_comment
+from black.nodes import is_one_sequence_between
# types
T = TypeVar("T")
"""Return True if we have a magic trailing comma, that is when:
- there's a trailing comma here
- it's not a one-tuple
+ - it's not a single-element subscript
Additionally, if ensure_removable:
- it's not from square bracket indexing
"""
return True
if closing.type == token.RSQB:
+ if (
+ Preview.one_element_subscript in self.mode
+ and closing.parent
+ and closing.parent.type == syms.trailer
+ and closing.opening_bracket
+ and is_one_sequence_between(
+ closing.opening_bracket,
+ closing,
+ self.leaves,
+ brackets=(token.LSQB, token.RSQB),
+ )
+ ):
+ return False
+
if not ensure_removable:
return True
comma = self.leaves[-1]
if self.is_import:
return True
- if not is_one_tuple_between(closing.opening_bracket, closing, self.leaves):
+ if closing.opening_bracket is not None and not is_one_sequence_between(
+ closing.opening_bracket, closing, self.leaves
+ ):
return True
return False
depth = current_line.depth
while self.previous_defs and self.previous_defs[-1] >= depth:
if self.is_pyi:
- before = 0 if depth else 1
+ 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.
+ before = min(1, before)
+ elif depth:
+ before = 0
+ else:
+ before = 1
else:
if depth:
before = 1
return 0, 0
if self.is_pyi:
- if self.previous_line.depth > current_line.depth:
- 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:
+ if current_line.is_class or self.previous_line.is_class:
+ if self.previous_line.depth < current_line.depth:
+ newlines = 0
+ elif self.previous_line.depth > current_line.depth:
+ newlines = 1
+ elif current_line.is_stub_class and self.previous_line.is_stub_class:
# No blank line between classes with an empty body
newlines = 0
else:
elif (
current_line.is_def or current_line.is_decorator
) and not self.previous_line.is_def:
- # Blank line between a block of functions (maybe with preceding
- # decorators) and a block of non-functions
+ if current_line.depth:
+ # In classes empty lines between attributes and methods should
+ # be preserved.
+ newlines = min(1, before)
+ else:
+ # Blank line between a block of functions (maybe with preceding
+ # decorators) and a block of non-functions
+ newlines = 1
+ elif self.previous_line.depth > current_line.depth:
newlines = 1
else:
newlines = 0
else:
- newlines = 2
- if current_line.depth and newlines:
- newlines -= 1
+ newlines = 1 if current_line.depth else 2
return newlines, 0
def can_omit_invisible_parens(
line: Line,
line_length: int,
- omit_on_explode: Collection[LeafID] = (),
) -> bool:
"""Does `line` have a shape safe to reformat without optional parens around it?
penultimate = line.leaves[-2]
last = line.leaves[-1]
- if line.magic_trailing_comma:
- try:
- penultimate, last = last_two_except(line.leaves, omit=omit_on_explode)
- except LookupError:
- # Turns out we'd omit everything. We cannot skip the optional parentheses.
- return False
if (
last.type == token.RPAR
# unnecessary.
return True
- if line.magic_trailing_comma and penultimate.type == token.COMMA:
- # The rightmost non-omitted bracket pair is the one we want to explode on.
- return True
-
if _can_omit_closing_paren(line, last=last, line_length=line_length):
return True
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