X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/bd1e98034907463f5d86f4d87e89202dc6c34dd4..2704dc796b49b4c5d348c92ba14ef1cfd908e7f1:/src/black/linegen.py diff --git a/src/black/linegen.py b/src/black/linegen.py index 8a28c39..a2e41bf 100644 --- a/src/black/linegen.py +++ b/src/black/linegen.py @@ -1,38 +1,67 @@ """ Generating lines of code. """ -from functools import partial, wraps import sys -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, is_arith_like, ensure_visible +from functools import partial, wraps +from typing import Collection, Iterator, List, Optional, Set, Union, cast + +from black.brackets import COMMA_PRIORITY, DOT_PRIORITY, max_delimiter_priority_in_atom +from black.comments import FMT_OFF, generate_comments, list_comments +from black.lines import ( + Line, + append_leaves, + can_be_split, + can_omit_invisible_parens, + is_line_short_enough, + line_to_string, +) +from black.mode import Feature, Mode, Preview from black.nodes import ( + ASSIGNMENTS, + CLOSING_BRACKETS, + OPENING_BRACKETS, + RARROW, + STANDALONE_COMMENT, + STATEMENT, + WHITESPACE, + Visitor, + ensure_visible, + is_arith_like, + is_atom_with_invisible_parens, is_docstring, is_empty_tuple, - is_one_tuple, + is_lpar_token, + is_multiline_string, + is_name_token, is_one_sequence_between, + is_one_tuple, + is_rpar_token, + is_stub_body, + is_stub_suite, + is_vararg, + is_walrus_assignment, + is_yield, + syms, + wrap_in_parentheses, ) -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 -from black.brackets import max_delimiter_priority_in_atom -from black.brackets import DOT_PRIORITY, COMMA_PRIORITY -from black.lines import Line, line_to_string, is_line_short_enough -from black.lines import can_omit_invisible_parens, can_be_split, append_leaves -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, StringSplitter -from black.trans import StringParenWrapper, StringParenStripper, hug_power_op -from black.mode import Mode, Feature, Preview - -from blib2to3.pytree import Node, Leaf +from black.strings import ( + fix_docstring, + get_string_prefix, + normalize_string_prefix, + normalize_string_quotes, +) +from black.trans import ( + CannotTransform, + StringMerger, + StringParenStripper, + StringParenWrapper, + StringSplitter, + Transformer, + hug_power_op, +) from blib2to3.pgen2 import token - +from blib2to3.pytree import Leaf, Node # types LeafID = int @@ -144,6 +173,33 @@ class LineGenerator(Visitor[Line]): yield from self.visit(child) + def visit_funcdef(self, node: Node) -> Iterator[Line]: + """Visit function definition.""" + if Preview.annotation_parens not in self.mode: + yield from self.visit_stmt(node, keywords={"def"}, parens=set()) + else: + yield from self.line() + + # Remove redundant brackets around return type annotation. + is_return_annotation = False + for child in node.children: + if child.type == token.RARROW: + is_return_annotation = True + elif is_return_annotation: + if child.type == syms.atom and child.children[0].type == token.LPAR: + if maybe_make_parens_invisible_in_atom( + child, + parent=node, + remove_brackets_around_comma=False, + ): + wrap_in_parentheses(node, child, visible=False) + else: + wrap_in_parentheses(node, child, visible=False) + is_return_annotation = False + + for child in node.children: + 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) @@ -193,7 +249,9 @@ class LineGenerator(Visitor[Line]): for child in children: yield from self.visit(child) - if child.type == token.ASYNC: + if child.type == token.ASYNC or child.type == STANDALONE_COMMENT: + # STANDALONE_COMMENT happens when `# fmt: skip` is applied on the async + # line. break internal_stmt = next(children) @@ -226,6 +284,9 @@ class LineGenerator(Visitor[Line]): ): wrap_in_parentheses(node, leaf) + if Preview.remove_redundant_parens in self.mode: + remove_await_parens(node) + yield from self.visit_default(node) def visit_SEMI(self, leaf: Leaf) -> Iterator[Line]: @@ -263,7 +324,24 @@ 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) + if Preview.normalize_docstring_quotes_and_prefixes_properly in self.mode: + # There was a bug where --skip-string-normalization wouldn't stop us + # from normalizing docstring prefixes. To maintain stability, we can + # only address this buggy behaviour while the preview style is enabled. + if self.mode.string_normalization: + docstring = normalize_string_prefix(leaf.value) + # visit_default() does handle string normalization for us, but + # since this method acts differently depending on quote style (ex. + # see padding logic below), there's a possibility for unstable + # formatting as visit_default() is called *after*. To avoid a + # situation where this function formats a docstring differently on + # the second pass, normalize it early. + docstring = normalize_string_quotes(docstring) + else: + docstring = leaf.value + else: + # ... otherwise, we'll keep the buggy behaviour >.< + docstring = normalize_string_prefix(leaf.value) prefix = get_string_prefix(docstring) docstring = docstring[len(prefix) :] # Remove the prefix quote_char = docstring[0] @@ -275,9 +353,9 @@ class LineGenerator(Visitor[Line]): quote_len = 1 if docstring[1] != quote_char else 3 docstring = docstring[quote_len:-quote_len] docstring_started_empty = not docstring + indent = " " * 4 * self.current_line.depth if is_multiline_string(leaf): - indent = " " * 4 * self.current_line.depth docstring = fix_docstring(docstring, indent) else: docstring = docstring.strip() @@ -299,7 +377,30 @@ class LineGenerator(Visitor[Line]): # We could enforce triple quotes at this point. quote = quote_char * quote_len - leaf.value = prefix + quote + docstring + quote + + # It's invalid to put closing single-character quotes on a new line. + if Preview.long_docstring_quotes_on_newline in self.mode and quote_len == 3: + # We need to find the length of the last line of the docstring + # to find if we can add the closing quotes to the line without + # exceeding the maximum line length. + # If docstring is one line, then we need to add the length + # of the indent, prefix, and starting quotes. Ending quotes are + # handled later. + lines = docstring.splitlines() + last_line_length = len(lines[-1]) if docstring else 0 + + if len(lines) == 1: + last_line_length += len(indent) + len(prefix) + quote_len + + # If adding closing quotes would cause the last line to exceed + # the maximum line length then put a line break before the + # closing quotes + if last_line_length + quote_len > self.mode.line_length: + leaf.value = prefix + quote + docstring + "\n" + indent + quote + else: + leaf.value = prefix + quote + docstring + quote + else: + leaf.value = prefix + quote + docstring + quote yield from self.visit_default(leaf) @@ -322,10 +423,10 @@ class LineGenerator(Visitor[Line]): self.visit_except_clause = partial( v, keywords={"except"}, parens={"except"} ) + self.visit_with_stmt = partial(v, keywords={"with"}, parens={"with"}) 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_with_stmt = partial(v, keywords={"with"}, parens=Ø) self.visit_classdef = partial(v, keywords={"class"}, parens=Ø) self.visit_expr_stmt = partial(v, keywords=Ø, parens=ASSIGNMENTS) self.visit_return_stmt = partial(v, keywords={"return"}, parens={"return"}) @@ -477,7 +578,10 @@ def left_hand_split(line: Line, _features: Collection[Feature] = ()) -> Iterator current_leaves is body_leaves and leaf.type in CLOSING_BRACKETS and leaf.opening_bracket is matching_bracket + and isinstance(matching_bracket, Leaf) ): + ensure_visible(leaf) + ensure_visible(matching_bracket) current_leaves = tail_leaves if body_leaves else head_leaves current_leaves.append(leaf) if current_leaves is head_leaves: @@ -845,11 +949,26 @@ def normalize_invisible_parens( check_lpar = True if check_lpar: - if child.type == syms.atom: + if ( + preview + and child.type == syms.atom + and node.type == syms.for_stmt + and isinstance(child.prev_sibling, Leaf) + and child.prev_sibling.type == token.NAME + and child.prev_sibling.value == "for" + ): + if maybe_make_parens_invisible_in_atom( + child, + parent=node, + remove_brackets_around_comma=True, + ): + wrap_in_parentheses(node, child, visible=False) + elif preview and isinstance(child, Node) and node.type == syms.with_stmt: + remove_with_parens(child, node) + elif child.type == syms.atom: if maybe_make_parens_invisible_in_atom( child, parent=node, - preview=preview, ): wrap_in_parentheses(node, child, visible=False) elif is_one_tuple(child): @@ -867,42 +986,127 @@ def normalize_invisible_parens( node.insert_child(index, Leaf(token.LPAR, "")) node.append_child(Leaf(token.RPAR, "")) break + elif ( + index == 1 + and child.type == token.STAR + and node.type == syms.except_clause + ): + # In except* (PEP 654), the star is actually part of + # of the keyword. So we need to skip the insertion of + # invisible parentheses to work more precisely. + continue elif not (isinstance(child, Leaf) and is_multiline_string(child)): wrap_in_parentheses(node, child, visible=False) - check_lpar = isinstance(child, Leaf) and child.value in parens_after + comma_check = child.type == token.COMMA if preview else False + + check_lpar = isinstance(child, Leaf) and ( + child.value in parens_after or comma_check + ) + + +def remove_await_parens(node: Node) -> None: + if node.children[0].type == token.AWAIT and len(node.children) > 1: + if ( + node.children[1].type == syms.atom + and node.children[1].children[0].type == token.LPAR + ): + if maybe_make_parens_invisible_in_atom( + node.children[1], + parent=node, + remove_brackets_around_comma=True, + ): + wrap_in_parentheses(node, node.children[1], visible=False) + + # Since await is an expression we shouldn't remove + # brackets in cases where this would change + # the AST due to operator precedence. + # Therefore we only aim to remove brackets around + # power nodes that aren't also await expressions themselves. + # https://peps.python.org/pep-0492/#updated-operator-precedence-table + # N.B. We've still removed any redundant nested brackets though :) + opening_bracket = cast(Leaf, node.children[1].children[0]) + closing_bracket = cast(Leaf, node.children[1].children[-1]) + bracket_contents = cast(Node, node.children[1].children[1]) + if bracket_contents.type != syms.power: + ensure_visible(opening_bracket) + ensure_visible(closing_bracket) + elif ( + bracket_contents.type == syms.power + and bracket_contents.children[0].type == token.AWAIT + ): + ensure_visible(opening_bracket) + ensure_visible(closing_bracket) + # If we are in a nested await then recurse down. + remove_await_parens(bracket_contents) + + +def remove_with_parens(node: Node, parent: Node) -> None: + """Recursively hide optional parens in `with` statements.""" + # Removing all unnecessary parentheses in with statements in one pass is a tad + # complex as different variations of bracketed statements result in pretty + # different parse trees: + # + # with (open("file")) as f: # this is an asexpr_test + # ... + # + # with (open("file") as f): # this is an atom containing an + # ... # asexpr_test + # + # with (open("file")) as f, (open("file")) as f: # this is asexpr_test, COMMA, + # ... # asexpr_test + # + # with (open("file") as f, open("file") as f): # an atom containing a + # ... # testlist_gexp which then + # # contains multiple asexpr_test(s) + if node.type == syms.atom: + if maybe_make_parens_invisible_in_atom( + node, + parent=parent, + remove_brackets_around_comma=True, + ): + wrap_in_parentheses(parent, node, visible=False) + if isinstance(node.children[1], Node): + remove_with_parens(node.children[1], node) + elif node.type == syms.testlist_gexp: + for child in node.children: + if isinstance(child, Node): + remove_with_parens(child, node) + elif node.type == syms.asexpr_test and not any( + leaf.type == token.COLONEQUAL for leaf in node.leaves() + ): + if maybe_make_parens_invisible_in_atom( + node.children[0], + parent=node, + remove_brackets_around_comma=True, + ): + wrap_in_parentheses(node, node.children[0], visible=False) def maybe_make_parens_invisible_in_atom( node: LN, parent: LN, - preview: bool = False, + remove_brackets_around_comma: 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. 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 and for_stmt_check) + or ( + # This condition tries to prevent removing non-optional brackets + # around a tuple, however, can be a bit overzealous so we provide + # and option to skip this check for `for` and `with` statements. + not remove_brackets_around_comma + and max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY + ) ): return False @@ -925,7 +1129,11 @@ def maybe_make_parens_invisible_in_atom( # make parentheses invisible first.value = "" last.value = "" - maybe_make_parens_invisible_in_atom(middle, parent=parent, preview=preview) + maybe_make_parens_invisible_in_atom( + middle, + parent=parent, + remove_brackets_around_comma=remove_brackets_around_comma, + ) if is_atom_with_invisible_parens(middle): # Strip the invisible parens from `middle` by replacing