import sys
from typing import Collection, Iterator, List, Optional, Set, Union
-from dataclasses import dataclass, field
-
-from black.nodes import WHITESPACE, STATEMENT, STANDALONE_COMMENT
+from black.nodes import WHITESPACE, RARROW, STATEMENT, STANDALONE_COMMENT
from black.nodes import ASSIGNMENTS, OPENING_BRACKETS, CLOSING_BRACKETS
from black.nodes import Visitor, syms, first_child_is_arith, ensure_visible
from black.nodes import is_docstring, is_empty_tuple, is_one_tuple, is_one_tuple_between
"""A readable split that fits the allotted line length is impossible."""
-@dataclass
+# This isn't a dataclass because @dataclass + Generic breaks mypyc.
+# See also https://github.com/mypyc/mypyc/issues/827.
class LineGenerator(Visitor[Line]):
"""Generates reformatted Line objects. Empty lines are not emitted.
in ways that will no longer stringify to valid Python code on the tree.
"""
- mode: Mode
- remove_u_prefix: bool = False
- current_line: Line = field(init=False)
+ def __init__(self, mode: Mode, remove_u_prefix: bool = False) -> None:
+ self.mode = mode
+ self.remove_u_prefix = remove_u_prefix
+ self.current_line: Line
+ self.__post_init__()
def line(self, indent: int = 0) -> Iterator[Line]:
"""Generate a line.
"""Visit a statement.
This implementation is shared for `if`, `while`, `for`, `try`, `except`,
- `def`, `with`, `class`, `assert` and assignments.
+ `def`, `with`, `class`, `assert`, and assignments.
The relevant Python language `keywords` for a given statement will be
NAME leaves within it. This methods puts those on a separate line.
yield from self.visit(child)
+ def visit_match_case(self, node: Node) -> Iterator[Line]:
+ """Visit either a match or case statement."""
+ normalize_invisible_parens(node, parens_after=set())
+
+ yield from self.line()
+ for child in node.children:
+ yield from self.visit(child)
+
def visit_suite(self, node: Node) -> Iterator[Line]:
"""Visit a suite."""
if self.mode.is_pyi and is_stub_suite(node):
self.visit_async_funcdef = self.visit_async_stmt
self.visit_decorated = self.visit_decorators
+ # PEP 634
+ self.visit_match_stmt = self.visit_match_case
+ self.visit_case_block = self.visit_match_case
+
def transform_line(
line: Line, mode: Mode, features: Collection[Feature] = ()
transformers = [left_hand_split]
else:
- def rhs(line: Line, features: Collection[Feature]) -> Iterator[Line]:
+ def _rhs(
+ self: object, line: Line, features: Collection[Feature]
+ ) -> Iterator[Line]:
"""Wraps calls to `right_hand_split`.
The calls increasingly `omit` right-hand trailers (bracket pairs with
line, line_length=mode.line_length, features=features
)
+ # HACK: nested functions (like _rhs) compiled by mypyc don't retain their
+ # __name__ attribute which is needed in `run_transformer` further down.
+ # Unfortunately a nested class breaks mypyc too. So a class must be created
+ # via type ... https://github.com/mypyc/mypyc/issues/884
+ rhs = type("rhs", (), {"__call__": _rhs})()
+
if mode.experimental_string_processing:
if line.inside_brackets:
transformers = [
yield from right_hand_split(line, line_length, features=features, omit=omit)
return
- except CannotSplit:
+ except CannotSplit as e:
if not (
can_be_split(body)
or is_line_short_enough(body, line_length=line_length)
):
raise CannotSplit(
"Splitting failed, body is still too long and can't be split."
- )
+ ) from e
elif head.contains_multiline_strings() or tail.contains_multiline_strings():
raise CannotSplit(
" satisfy the splitting algorithm because the head or the tail"
" contains multiline strings which by definition never fit one"
" line."
- )
+ ) from e
ensure_visible(opening_bracket)
ensure_visible(closing_bracket)
original.is_def
and opening_bracket.value == "("
and not any(leaf.type == token.COMMA for leaf in leaves)
+ # In particular, don't add one within a parenthesized return annotation.
+ # Unfortunately the indicator we're in a return annotation (RARROW) may
+ # be defined directly in the parent node, the parent of the parent ...
+ # and so on depending on how complex the return annotation is.
+ # This isn't perfect and there's some false negatives but they are in
+ # contexts were a comma is actually fine.
+ and not any(
+ node.prev_sibling.type == RARROW
+ for node in (
+ leaves[0].parent,
+ getattr(leaves[0].parent, "parent", None),
+ )
+ if isinstance(node, Node) and isinstance(node.prev_sibling, Leaf)
+ )
)
if original.is_import or no_commas:
try:
last_leaf = line.leaves[-1]
except IndexError:
- raise CannotSplit("Line empty")
+ raise CannotSplit("Line empty") from None
bt = line.bracket_tracker
try:
delimiter_priority = bt.max_delimiter_priority(exclude={id(last_leaf)})
except ValueError:
- raise CannotSplit("No delimiters found")
+ raise CannotSplit("No delimiters found") from None
if delimiter_priority == DOT_PRIORITY:
if bt.delimiter_count_with_priority(delimiter_priority) == 1:
result.extend(transform_line(transformed_line, mode=mode, features=features))
- if not (
- transform.__name__ == "rhs"
- and line.bracket_tracker.invisible
- and not any(bracket.value for bracket in line.bracket_tracker.invisible)
- and not line.contains_multiline_strings()
- and not result[0].contains_uncollapsable_type_comments()
- and not result[0].contains_unsplittable_type_ignore()
- and not is_line_short_enough(result[0], line_length=mode.line_length)
+ if (
+ transform.__class__.__name__ != "rhs"
+ or not line.bracket_tracker.invisible
+ or any(bracket.value for bracket in line.bracket_tracker.invisible)
+ or line.contains_multiline_strings()
+ or result[0].contains_uncollapsable_type_comments()
+ or result[0].contains_unsplittable_type_ignore()
+ or is_line_short_enough(result[0], line_length=mode.line_length)
+ # If any leaves have no parents (which _can_ occur since
+ # `transform(line)` potentially destroys the line's underlying node
+ # structure), then we can't proceed. Doing so would cause the below
+ # call to `append_leaves()` to fail.
+ or any(leaf.parent is None for leaf in line.leaves)
):
return result
projects / etc / vim.git / blobdiff