X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/117891878e5be4d6b771ae5de299e51b679cea27..ae2c0758c9e61a385df9700dc9c231bf54887041:/src/black/linegen.py diff --git a/src/black/linegen.py b/src/black/linegen.py index 4cba416..8a28c39 100644 --- a/src/black/linegen.py +++ b/src/black/linegen.py @@ -7,8 +7,14 @@ from typing import Collection, Iterator, List, Optional, Set, Union 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 Visitor, syms, is_arith_like, ensure_visible +from black.nodes import ( + is_docstring, + is_empty_tuple, + is_one_tuple, + is_one_sequence_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 @@ -20,10 +26,9 @@ from black.comments import generate_comments, list_comments, FMT_OFF from black.numerics import normalize_numeric_literal from black.strings import get_string_prefix, fix_docstring from black.strings import normalize_string_prefix, normalize_string_quotes -from black.trans import Transformer, CannotTransform, StringMerger -from black.trans import StringSplitter, StringParenWrapper, StringParenStripper -from black.mode import Mode -from black.mode import Feature +from black.trans import Transformer, CannotTransform, StringMerger, StringSplitter +from black.trans import StringParenWrapper, StringParenStripper, hug_power_op +from black.mode import Mode, Feature, Preview from blib2to3.pytree import Node, Leaf from blib2to3.pgen2 import token @@ -47,9 +52,8 @@ class LineGenerator(Visitor[Line]): in ways that will no longer stringify to valid Python code on the tree. """ - def __init__(self, mode: Mode, remove_u_prefix: bool = False) -> None: + def __init__(self, mode: Mode) -> None: self.mode = mode - self.remove_u_prefix = remove_u_prefix self.current_line: Line self.__post_init__() @@ -73,7 +77,7 @@ class LineGenerator(Visitor[Line]): """Default `visit_*()` implementation. Recurses to children of `node`.""" if isinstance(node, Leaf): any_open_brackets = self.current_line.bracket_tracker.any_open_brackets() - for comment in generate_comments(node): + for comment in generate_comments(node, preview=self.mode.preview): if any_open_brackets: # any comment within brackets is subject to splitting self.current_line.append(comment) @@ -91,9 +95,7 @@ class LineGenerator(Visitor[Line]): normalize_prefix(node, inside_brackets=any_open_brackets) if self.mode.string_normalization and node.type == token.STRING: - node.value = normalize_string_prefix( - node.value, remove_u_prefix=self.remove_u_prefix - ) + node.value = normalize_string_prefix(node.value) node.value = normalize_string_quotes(node.value) if node.type == token.NUMBER: normalize_numeric_literal(node) @@ -127,7 +129,7 @@ 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. @@ -135,13 +137,21 @@ class LineGenerator(Visitor[Line]): `parens` holds a set of string leaf values immediately after which invisible parens should be put. """ - normalize_invisible_parens(node, parens_after=parens) + normalize_invisible_parens(node, parens_after=parens, preview=self.mode.preview) 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(), preview=self.mode.preview) + + 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): @@ -151,8 +161,12 @@ class LineGenerator(Visitor[Line]): def visit_simple_stmt(self, node: Node) -> Iterator[Line]: """Visit a statement without nested statements.""" - if first_child_is_arith(node): - wrap_in_parentheses(node, node.children[0], visible=False) + prev_type: Optional[int] = None + for child in node.children: + if (prev_type is None or prev_type == token.SEMI) and is_arith_like(child): + wrap_in_parentheses(node, child, visible=False) + prev_type = child.type + 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): @@ -192,6 +206,28 @@ class LineGenerator(Visitor[Line]): yield from self.line() yield from self.visit(child) + def visit_power(self, node: Node) -> Iterator[Line]: + for idx, leaf in enumerate(node.children[:-1]): + next_leaf = node.children[idx + 1] + + if not isinstance(leaf, Leaf): + continue + + value = leaf.value.lower() + if ( + leaf.type == token.NUMBER + and next_leaf.type == syms.trailer + # Ensure that we are in an attribute trailer + and next_leaf.children[0].type == token.DOT + # It shouldn't wrap hexadecimal, binary and octal literals + and not value.startswith(("0x", "0b", "0o")) + # It shouldn't wrap complex literals + and "j" not in value + ): + wrap_in_parentheses(node, leaf) + + yield from self.visit_default(node) + def visit_SEMI(self, leaf: Leaf) -> Iterator[Line]: """Remove a semicolon and put the other statement on a separate line.""" yield from self.line() @@ -227,7 +263,7 @@ class LineGenerator(Visitor[Line]): if is_docstring(leaf) and "\\\n" not in leaf.value: # We're ignoring docstrings with backslash newline escapes because changing # indentation of those changes the AST representation of the code. - docstring = normalize_string_prefix(leaf.value, self.remove_u_prefix) + docstring = normalize_string_prefix(leaf.value) prefix = get_string_prefix(docstring) docstring = docstring[len(prefix) :] # Remove the prefix quote_char = docstring[0] @@ -282,7 +318,12 @@ class LineGenerator(Visitor[Line]): self.visit_try_stmt = partial( v, keywords={"try", "except", "else", "finally"}, parens=Ø ) - self.visit_except_clause = partial(v, keywords={"except"}, parens=Ø) + if self.mode.preview: + self.visit_except_clause = partial( + v, keywords={"except"}, parens={"except"} + ) + else: + self.visit_except_clause = partial(v, keywords={"except"}, parens=Ø) self.visit_with_stmt = partial(v, keywords={"with"}, parens=Ø) self.visit_funcdef = partial(v, keywords={"def"}, parens=Ø) self.visit_classdef = partial(v, keywords={"class"}, parens=Ø) @@ -294,8 +335,8 @@ 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( @@ -332,7 +373,7 @@ def transform_line( and not (line.inside_brackets and line.contains_standalone_comments()) ): # Only apply basic string preprocessing, since lines shouldn't be split here. - if mode.experimental_string_processing: + if Preview.string_processing in mode: transformers = [string_merge, string_paren_strip] else: transformers = [] @@ -375,7 +416,7 @@ def transform_line( # via type ... https://github.com/mypyc/mypyc/issues/884 rhs = type("rhs", (), {"__call__": _rhs})() - if mode.experimental_string_processing: + if Preview.string_processing in mode: if line.inside_brackets: transformers = [ string_merge, @@ -399,6 +440,9 @@ def transform_line( transformers = [delimiter_split, standalone_comment_split, rhs] else: transformers = [rhs] + # It's always safe to attempt hugging of power operations and pretty much every line + # could match. + transformers.append(hug_power_op) for transform in transformers: # We are accumulating lines in `result` because we might want to abort @@ -509,7 +553,7 @@ def right_hand_split( # there are no standalone comments in the body and not body.contains_standalone_comments(0) # and we can actually remove the parens - and can_omit_invisible_parens(body, line_length, omit_on_explode=omit) + and can_omit_invisible_parens(body, line_length) ): omit = {id(closing_bracket), *omit} try: @@ -631,9 +675,9 @@ def dont_increase_indentation(split_func: Transformer) -> Transformer: @wraps(split_func) def split_wrapper(line: Line, features: Collection[Feature] = ()) -> Iterator[Line]: - for line in split_func(line, features): - normalize_prefix(line.leaves[0], inside_brackets=True) - yield line + for split_line in split_func(line, features): + normalize_prefix(split_line.leaves[0], inside_brackets=True) + yield split_line return split_wrapper @@ -768,7 +812,9 @@ def normalize_prefix(leaf: Leaf, *, inside_brackets: bool) -> None: leaf.prefix = "" -def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: +def normalize_invisible_parens( + node: Node, parens_after: Set[str], *, preview: bool +) -> None: """Make existing optional parentheses invisible or create new ones. `parens_after` is a set of string leaf values immediately after which parens @@ -777,7 +823,7 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: Standardizes on visible parentheses for single-element tuples, and keeps existing visible parentheses for other tuples and generator expressions. """ - for pc in list_comments(node.prefix, is_endmarker=False): + for pc in list_comments(node.prefix, is_endmarker=False, preview=preview): if pc.value in FMT_OFF: # This `node` has a prefix with `# fmt: off`, don't mess with parens. return @@ -786,7 +832,9 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: # Fixes a bug where invisible parens are not properly stripped from # assignment statements that contain type annotations. if isinstance(child, Node) and child.type == syms.annassign: - normalize_invisible_parens(child, parens_after=parens_after) + normalize_invisible_parens( + child, parens_after=parens_after, preview=preview + ) # Add parentheses around long tuple unpacking in assignments. if ( @@ -798,17 +846,22 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: if check_lpar: if child.type == syms.atom: - if maybe_make_parens_invisible_in_atom(child, parent=node): + if maybe_make_parens_invisible_in_atom( + child, + parent=node, + preview=preview, + ): wrap_in_parentheses(node, child, visible=False) elif is_one_tuple(child): wrap_in_parentheses(node, child, visible=True) 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, "")) @@ -821,7 +874,11 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: check_lpar = isinstance(child, Leaf) and child.value in parens_after -def maybe_make_parens_invisible_in_atom(node: LN, parent: LN) -> bool: +def maybe_make_parens_invisible_in_atom( + node: LN, + parent: LN, + preview: bool = False, +) -> bool: """If it's safe, make the parens in the atom `node` invisible, recursively. Additionally, remove repeated, adjacent invisible parens from the atom `node` as they are redundant. @@ -829,13 +886,23 @@ def maybe_make_parens_invisible_in_atom(node: LN, parent: LN) -> bool: Returns whether the node should itself be wrapped in invisible parentheses. """ + if ( + preview + and parent.type == syms.for_stmt + and isinstance(node.prev_sibling, Leaf) + and node.prev_sibling.type == token.NAME + and node.prev_sibling.value == "for" + ): + for_stmt_check = False + else: + for_stmt_check = True if ( node.type != syms.atom or is_empty_tuple(node) or is_one_tuple(node) or (is_yield(node) and parent.type != syms.expr_stmt) - or max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY + or (max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY and for_stmt_check) ): return False @@ -853,12 +920,12 @@ 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 - maybe_make_parens_invisible_in_atom(middle, parent=parent) + first.value = "" + last.value = "" + maybe_make_parens_invisible_in_atom(middle, parent=parent, preview=preview) if is_atom_with_invisible_parens(middle): # Strip the invisible parens from `middle` by replacing @@ -933,7 +1000,8 @@ def generate_trailers_to_omit(line: Line, line_length: int) -> Iterator[Set[Leaf if ( prev and prev.type == token.COMMA - and not is_one_tuple_between( + and leaf.opening_bracket is not None + and not is_one_sequence_between( leaf.opening_bracket, leaf, line.leaves ) ): @@ -960,7 +1028,8 @@ def generate_trailers_to_omit(line: Line, line_length: int) -> Iterator[Set[Leaf if ( prev and prev.type == token.COMMA - and not is_one_tuple_between(leaf.opening_bracket, leaf, line.leaves) + and leaf.opening_bracket is not None + and not is_one_sequence_between(leaf.opening_bracket, leaf, line.leaves) ): # Never omit bracket pairs with trailing commas. # We need to explode on those.