X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/75f99bded33abe962ca08bf16c77635ac9ca00a1..27932494bcefac03497dd92dcf0c59a04c10d757:/src/black/linegen.py?ds=sidebyside diff --git a/src/black/linegen.py b/src/black/linegen.py index caffbab..219495e 100644 --- a/src/black/linegen.py +++ b/src/black/linegen.py @@ -1,38 +1,73 @@ """ Generating lines of code. """ -from functools import partial, wraps import sys +from enum import Enum, auto +from functools import partial, wraps from typing import Collection, Iterator, List, Optional, Set, Union, cast -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 black.brackets import ( + COMMA_PRIORITY, + DOT_PRIORITY, + get_leaves_inside_matching_brackets, + 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 @@ -220,7 +255,9 @@ 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) @@ -293,7 +330,24 @@ 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] @@ -305,9 +359,9 @@ 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() @@ -329,7 +383,30 @@ 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) @@ -490,6 +567,12 @@ def transform_line( yield line +class _BracketSplitComponent(Enum): + head = auto() + body = auto() + tail = auto() + + def left_hand_split(line: Line, _features: Collection[Feature] = ()) -> Iterator[Line]: """Split line into many lines, starting with the first matching bracket pair. @@ -520,9 +603,15 @@ def left_hand_split(line: Line, _features: Collection[Feature] = ()) -> Iterator if not matching_bracket: raise CannotSplit("No brackets found") - head = bracket_split_build_line(head_leaves, line, matching_bracket) - body = bracket_split_build_line(body_leaves, line, matching_bracket, is_body=True) - tail = bracket_split_build_line(tail_leaves, line, matching_bracket) + head = bracket_split_build_line( + head_leaves, line, matching_bracket, component=_BracketSplitComponent.head + ) + body = bracket_split_build_line( + body_leaves, line, matching_bracket, component=_BracketSplitComponent.body + ) + tail = bracket_split_build_line( + tail_leaves, line, matching_bracket, component=_BracketSplitComponent.tail + ) bracket_split_succeeded_or_raise(head, body, tail) for result in (head, body, tail): if result: @@ -568,9 +657,15 @@ def right_hand_split( tail_leaves.reverse() body_leaves.reverse() head_leaves.reverse() - head = bracket_split_build_line(head_leaves, line, opening_bracket) - body = bracket_split_build_line(body_leaves, line, opening_bracket, is_body=True) - tail = bracket_split_build_line(tail_leaves, line, opening_bracket) + head = bracket_split_build_line( + head_leaves, line, opening_bracket, component=_BracketSplitComponent.head + ) + body = bracket_split_build_line( + body_leaves, line, opening_bracket, component=_BracketSplitComponent.body + ) + tail = bracket_split_build_line( + tail_leaves, line, opening_bracket, component=_BracketSplitComponent.tail + ) bracket_split_succeeded_or_raise(head, body, tail) if ( Feature.FORCE_OPTIONAL_PARENTHESES not in features @@ -644,15 +739,23 @@ def bracket_split_succeeded_or_raise(head: Line, body: Line, tail: Line) -> None def bracket_split_build_line( - leaves: List[Leaf], original: Line, opening_bracket: Leaf, *, is_body: bool = False + leaves: List[Leaf], + original: Line, + opening_bracket: Leaf, + *, + component: _BracketSplitComponent, ) -> Line: """Return a new line with given `leaves` and respective comments from `original`. - If `is_body` is True, the result line is one-indented inside brackets and as such - has its first leaf's prefix normalized and a trailing comma added when expected. + If it's the head component, brackets will be tracked so trailing commas are + respected. + + If it's the body component, the result line is one-indented inside brackets and as + such has its first leaf's prefix normalized and a trailing comma added when + expected. """ result = Line(mode=original.mode, depth=original.depth) - if is_body: + if component is _BracketSplitComponent.body: result.inside_brackets = True result.depth += 1 if leaves: @@ -690,12 +793,24 @@ def bracket_split_build_line( leaves.insert(i + 1, new_comma) break + leaves_to_track: Set[LeafID] = set() + if ( + Preview.handle_trailing_commas_in_head in original.mode + and component is _BracketSplitComponent.head + ): + leaves_to_track = get_leaves_inside_matching_brackets(leaves) # Populate the line for leaf in leaves: - result.append(leaf, preformatted=True) + result.append( + leaf, + preformatted=True, + track_bracket=id(leaf) in leaves_to_track, + ) for comment_after in original.comments_after(leaf): result.append(comment_after, preformatted=True) - if is_body and should_split_line(result, opening_bracket): + if component is _BracketSplitComponent.body and should_split_line( + result, opening_bracket + ): result.should_split_rhs = True return result @@ -915,6 +1030,15 @@ 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)