Generating lines of code.
"""
import sys
-from dataclasses import dataclass, replace
+from dataclasses import replace
from enum import Enum, auto
from functools import partial, wraps
from typing import Collection, Iterator, List, Optional, Set, Union, cast
from black.comments import FMT_OFF, generate_comments, list_comments
from black.lines import (
Line,
+ RHSResult,
append_leaves,
can_be_split,
can_omit_invisible_parens,
Visitor,
ensure_visible,
is_arith_like,
+ is_async_stmt_or_funcdef,
is_atom_with_invisible_parens,
is_docstring,
is_empty_tuple,
is_stub_body,
is_stub_suite,
is_tuple_containing_walrus,
+ is_type_ignore_comment_string,
is_vararg,
is_walrus_assignment,
is_yield,
self.current_line.depth += indent
return # Line is empty, don't emit. Creating a new one unnecessary.
+ if (
+ Preview.improved_async_statements_handling in self.mode
+ and len(self.current_line.leaves) == 1
+ and is_async_stmt_or_funcdef(self.current_line.leaves[0])
+ ):
+ # Special case for async def/for/with statements. `visit_async_stmt`
+ # adds an `ASYNC` leaf then visits the child def/for/with statement
+ # nodes. Line yields from those nodes shouldn't treat the former
+ # `ASYNC` leaf as a complete line.
+ return
+
complete_line = self.current_line
self.current_line = Line(mode=self.mode, depth=complete_line.depth + indent)
yield complete_line
yield from self.visit(child)
+ def visit_typeparams(self, node: Node) -> Iterator[Line]:
+ yield from self.visit_default(node)
+ node.children[0].prefix = ""
+
+ def visit_typevartuple(self, node: Node) -> Iterator[Line]:
+ yield from self.visit_default(node)
+ node.children[1].prefix = ""
+
+ def visit_paramspec(self, node: Node) -> Iterator[Line]:
+ yield from self.visit_default(node)
+ node.children[1].prefix = ""
+
def visit_dictsetmaker(self, node: Node) -> Iterator[Line]:
if Preview.wrap_long_dict_values_in_parens in self.mode:
for i, child in enumerate(node.children):
def visit_suite(self, node: Node) -> Iterator[Line]:
"""Visit a suite."""
- if self.mode.is_pyi and is_stub_suite(node):
+ if (
+ self.mode.is_pyi or Preview.dummy_implementations in self.mode
+ ) and is_stub_suite(node):
yield from self.visit(node.children[2])
else:
yield from self.visit_default(node)
is_suite_like = node.parent and node.parent.type in STATEMENT
if is_suite_like:
- if self.mode.is_pyi and is_stub_body(node):
+ if (
+ self.mode.is_pyi or Preview.dummy_implementations in self.mode
+ ) and is_stub_body(node):
yield from self.visit_default(node)
else:
yield from self.line(+1)
else:
if (
- not self.mode.is_pyi
+ not (self.mode.is_pyi or Preview.dummy_implementations in self.mode)
or not node.parent
or not is_stub_suite(node.parent)
):
break
internal_stmt = next(children)
- for child in internal_stmt.children:
- yield from self.visit(child)
+ if Preview.improved_async_statements_handling in self.mode:
+ yield from self.visit(internal_stmt)
+ else:
+ for child in internal_stmt.children:
+ yield from self.visit(child)
def visit_decorators(self, node: Node) -> Iterator[Line]:
"""Visit decorators."""
node.insert_child(index, Node(syms.atom, [lpar, operand, rpar]))
yield from self.visit_default(node)
+ def visit_tname(self, node: Node) -> Iterator[Line]:
+ """
+ Add potential parentheses around types in function parameter lists to be made
+ into real parentheses in case the type hint is too long to fit on a line
+ Examples:
+ def foo(a: int, b: float = 7): ...
+
+ ->
+
+ def foo(a: (int), b: (float) = 7): ...
+ """
+ if Preview.parenthesize_long_type_hints in self.mode:
+ assert len(node.children) == 3
+ if maybe_make_parens_invisible_in_atom(node.children[2], parent=node):
+ wrap_in_parentheses(node, node.children[2], visible=False)
+
+ yield from self.visit_default(node)
+
def visit_STRING(self, leaf: Leaf) -> Iterator[Line]:
if Preview.hex_codes_in_unicode_sequences in self.mode:
normalize_unicode_escape_sequences(leaf)
self.visit_except_clause = partial(v, keywords={"except"}, parens={"except"})
self.visit_with_stmt = partial(v, keywords={"with"}, parens={"with"})
self.visit_classdef = partial(v, keywords={"class"}, parens=Ø)
- self.visit_expr_stmt = partial(v, keywords=Ø, parens=ASSIGNMENTS)
+
+ # When this is moved out of preview, add ":" directly to ASSIGNMENTS in nodes.py
+ if Preview.parenthesize_long_type_hints in self.mode:
+ assignments = ASSIGNMENTS | {":"}
+ else:
+ assignments = ASSIGNMENTS
+ self.visit_expr_stmt = partial(v, keywords=Ø, parens=assignments)
+
self.visit_return_stmt = partial(v, keywords={"return"}, parens={"return"})
self.visit_import_from = partial(v, keywords=Ø, parens={"import"})
self.visit_del_stmt = partial(v, keywords=Ø, parens={"del"})
transformers = [string_merge, string_paren_strip]
else:
transformers = []
- elif line.is_def:
+ elif line.is_def and not should_split_funcdef_with_rhs(line, mode):
transformers = [left_hand_split]
else:
yield line
+def should_split_funcdef_with_rhs(line: Line, mode: Mode) -> bool:
+ """If a funcdef has a magic trailing comma in the return type, then we should first
+ split the line with rhs to respect the comma.
+ """
+ if Preview.respect_magic_trailing_comma_in_return_type not in mode:
+ return False
+
+ return_type_leaves: List[Leaf] = []
+ in_return_type = False
+
+ for leaf in line.leaves:
+ if leaf.type == token.COLON:
+ in_return_type = False
+ if in_return_type:
+ return_type_leaves.append(leaf)
+ if leaf.type == token.RARROW:
+ in_return_type = True
+
+ # using `bracket_split_build_line` will mess with whitespace, so we duplicate a
+ # couple lines from it.
+ result = Line(mode=line.mode, depth=line.depth)
+ leaves_to_track = get_leaves_inside_matching_brackets(return_type_leaves)
+ for leaf in return_type_leaves:
+ result.append(
+ leaf,
+ preformatted=True,
+ track_bracket=id(leaf) in leaves_to_track,
+ )
+
+ # we could also return true if the line is too long, and the return type is longer
+ # than the param list. Or if `should_split_rhs` returns True.
+ return result.magic_trailing_comma is not None
+
+
class _BracketSplitComponent(Enum):
head = auto()
body = auto()
yield result
-@dataclass
-class _RHSResult:
- """Intermediate split result from a right hand split."""
-
- head: Line
- body: Line
- tail: Line
- opening_bracket: Leaf
- closing_bracket: Leaf
-
-
def right_hand_split(
line: Line,
mode: Mode,
def _first_right_hand_split(
line: Line,
omit: Collection[LeafID] = (),
-) -> _RHSResult:
+) -> RHSResult:
"""Split the line into head, body, tail starting with the last bracket pair.
Note: this function should not have side effects. It's relied upon by
tail_leaves, line, opening_bracket, component=_BracketSplitComponent.tail
)
bracket_split_succeeded_or_raise(head, body, tail)
- return _RHSResult(head, body, tail, opening_bracket, closing_bracket)
+ return RHSResult(head, body, tail, opening_bracket, closing_bracket)
def _maybe_split_omitting_optional_parens(
- rhs: _RHSResult,
+ rhs: RHSResult,
line: Line,
mode: Mode,
features: Collection[Feature] = (),
# there are no standalone comments in the body
and not rhs.body.contains_standalone_comments(0)
# and we can actually remove the parens
- and can_omit_invisible_parens(rhs.body, mode.line_length)
+ and can_omit_invisible_parens(rhs, mode.line_length)
):
omit = {id(rhs.closing_bracket), *omit}
try:
- # The _RHSResult Omitting Optional Parens.
+ # The RHSResult Omitting Optional Parens.
rhs_oop = _first_right_hand_split(line, omit=omit)
if not (
Preview.prefer_splitting_right_hand_side_of_assignments in line.mode
yield result
-def _prefer_split_rhs_oop(rhs_oop: _RHSResult, mode: Mode) -> bool:
+def _prefer_split_rhs_oop(rhs_oop: RHSResult, mode: Mode) -> bool:
"""
Returns whether we should prefer the result from a split omitting optional parens.
"""
)
if isinstance(node, Node) and isinstance(node.prev_sibling, Leaf)
)
+ # Except the false negatives above for PEP 604 unions where we
+ # can't add the comma.
+ and not (
+ leaves[0].parent
+ and leaves[0].parent.next_sibling
+ and leaves[0].parent.next_sibling.type == token.VBAR
+ )
)
if original.is_import or no_commas:
Returns whether the node should itself be wrapped in invisible parentheses.
"""
if (
- node.type != syms.atom
+ node.type not in (syms.atom, syms.expr)
or is_empty_tuple(node)
or is_one_tuple(node)
or (is_yield(node) and parent.type != syms.expr_stmt)
syms.except_clause,
syms.funcdef,
syms.with_stmt,
+ syms.tname,
# these ones aren't useful to end users, but they do please fuzzers
syms.for_stmt,
syms.del_stmt,
if is_lpar_token(first) and is_rpar_token(last):
middle = node.children[1]
# make parentheses invisible
- first.value = ""
- last.value = ""
+ if (
+ # If the prefix of `middle` includes a type comment with
+ # ignore annotation, then we do not remove the parentheses
+ not is_type_ignore_comment_string(middle.prefix.strip())
+ ):
+ first.value = ""
+ last.value = ""
maybe_make_parens_invisible_in_atom(
middle,
parent=parent,
projects / etc / vim.git / blobdiff