X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/1e0ec543ff3a7de715c8ee3359c8defb2c2c0e0d..ea4c772746d787a93a0f19ce3cbabfacd8094205:/src/black/linegen.py diff --git a/src/black/linegen.py b/src/black/linegen.py index 8cf32c9..dc238c3 100644 --- a/src/black/linegen.py +++ b/src/black/linegen.py @@ -5,12 +5,11 @@ from functools import partial, wraps import sys from typing import Collection, Iterator, List, Optional, Set, Union -from dataclasses import dataclass, field - 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 +from black.nodes import is_name_token, is_lpar_token, is_rpar_token from black.nodes import is_walrus_assignment, is_yield, is_vararg, is_multiline_string from black.nodes import is_stub_suite, is_stub_body, is_atom_with_invisible_parens from black.nodes import wrap_in_parentheses @@ -40,7 +39,8 @@ class CannotSplit(CannotTransform): """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. @@ -48,9 +48,11 @@ class LineGenerator(Visitor[Line]): 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. @@ -126,7 +128,7 @@ class LineGenerator(Visitor[Line]): """Visit a statement. This implementation is shared for `if`, `while`, `for`, `try`, `except`, - `def`, `with`, `class`, `assert`, `match`, `case` 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. @@ -136,11 +138,19 @@ class LineGenerator(Visitor[Line]): """ normalize_invisible_parens(node, parens_after=parens) for child in node.children: - if child.type == token.NAME and child.value in keywords: # type: ignore + if is_name_token(child) and child.value in keywords: yield from self.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): @@ -293,8 +303,8 @@ class LineGenerator(Visitor[Line]): self.visit_decorated = self.visit_decorators # PEP 634 - self.visit_match_stmt = partial(v, keywords={"match"}, parens=Ø) - self.visit_case_block = partial(v, keywords={"case"}, parens=Ø) + self.visit_match_stmt = self.visit_match_case + self.visit_case_block = self.visit_match_case def transform_line( @@ -339,7 +349,9 @@ def transform_line( 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 @@ -366,6 +378,12 @@ def transform_line( 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 = [ @@ -796,10 +814,11 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: elif node.type == syms.import_from: # "import from" nodes store parentheses directly as part of # the statement - if child.type == token.LPAR: + if is_lpar_token(child): + assert is_rpar_token(node.children[-1]) # make parentheses invisible - child.value = "" # type: ignore - node.children[-1].value = "" # type: ignore + child.value = "" + node.children[-1].value = "" elif child.type != token.STAR: # insert invisible parentheses node.insert_child(index, Leaf(token.LPAR, "")) @@ -844,11 +863,11 @@ def maybe_make_parens_invisible_in_atom(node: LN, parent: LN) -> bool: first = node.children[0] last = node.children[-1] - if first.type == token.LPAR and last.type == token.RPAR: + if is_lpar_token(first) and is_rpar_token(last): middle = node.children[1] # make parentheses invisible - first.value = "" # type: ignore - last.value = "" # type: ignore + first.value = "" + last.value = "" maybe_make_parens_invisible_in_atom(middle, parent=parent) if is_atom_with_invisible_parens(middle): @@ -980,7 +999,7 @@ def run_transformer( result.extend(transform_line(transformed_line, mode=mode, features=features)) if ( - transform.__name__ != "rhs" + 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()