X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/4a063a9f8d7069ea82186ac9aff5a2cd1c2618d7..688f78d380706fd20776b31eb1ead98ba3f45839:/src/black/lines.py diff --git a/src/black/lines.py b/src/black/lines.py index b656048..daf0444 100644 --- a/src/black/lines.py +++ b/src/black/lines.py @@ -15,7 +15,7 @@ from typing import ( cast, ) -from black.brackets import DOT_PRIORITY, BracketTracker +from black.brackets import COMMA_PRIORITY, DOT_PRIORITY, BracketTracker from black.mode import Mode, Preview from black.nodes import ( BRACKETS, @@ -28,10 +28,12 @@ from black.nodes import ( is_multiline_string, is_one_sequence_between, is_type_comment, + is_with_or_async_with_stmt, replace_child, syms, whitespace, ) +from black.strings import str_width from blib2to3.pgen2 import token from blib2to3.pytree import Leaf, Node @@ -122,6 +124,11 @@ class Line: """Is this an import line?""" return bool(self) and is_import(self.leaves[0]) + @property + def is_with_or_async_with_stmt(self) -> bool: + """Is this a with_stmt line?""" + return bool(self) and is_with_or_async_with_stmt(self.leaves[0]) + @property def is_class(self) -> bool: """Is this line a class definition?""" @@ -189,6 +196,26 @@ class Line: return False return self.leaves[-1].type == token.COLON + def is_fmt_pass_converted( + self, *, first_leaf_matches: Optional[Callable[[Leaf], bool]] = None + ) -> bool: + """Is this line converted from fmt off/skip code? + + If first_leaf_matches is not None, it only returns True if the first + leaf of converted code matches. + """ + if len(self.leaves) != 1: + return False + leaf = self.leaves[0] + if ( + leaf.type != STANDALONE_COMMENT + or leaf.fmt_pass_converted_first_leaf is None + ): + return False + return first_leaf_matches is None or first_leaf_matches( + leaf.fmt_pass_converted_first_leaf + ) + def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool: """If so, needs to be split before emitting.""" for leaf in self.leaves: @@ -449,6 +476,17 @@ class Line: return bool(self.leaves or self.comments) +@dataclass +class RHSResult: + """Intermediate split result from a right hand split.""" + + head: Line + body: Line + tail: Line + opening_bracket: Leaf + closing_bracket: Leaf + + @dataclass class LinesBlock: """Class that holds information about a block of formatted lines. @@ -484,7 +522,7 @@ class EmptyLineTracker: mode: Mode previous_line: Optional[Line] = None previous_block: Optional[LinesBlock] = None - previous_defs: List[int] = field(default_factory=list) + previous_defs: List[Line] = field(default_factory=list) semantic_leading_comment: Optional[LinesBlock] = None def maybe_empty_lines(self, current_line: Line) -> LinesBlock: @@ -540,12 +578,18 @@ class EmptyLineTracker: else: before = 0 depth = current_line.depth - while self.previous_defs and self.previous_defs[-1] >= depth: + while self.previous_defs and self.previous_defs[-1].depth >= depth: if self.mode.is_pyi: assert self.previous_line is not None if depth and not current_line.is_def and self.previous_line.is_def: # Empty lines between attributes and methods should be preserved. before = min(1, before) + elif ( + Preview.blank_line_after_nested_stub_class in self.mode + and self.previous_defs[-1].is_class + and not self.previous_defs[-1].is_stub_class + ): + before = 1 elif depth: before = 0 else: @@ -555,7 +599,7 @@ class EmptyLineTracker: before = 1 elif ( not depth - and self.previous_defs[-1] + and self.previous_defs[-1].depth and current_line.leaves[-1].type == token.COLON and ( current_line.leaves[0].value @@ -580,6 +624,7 @@ class EmptyLineTracker: self.previous_line and self.previous_line.is_import and not current_line.is_import + and not current_line.is_fmt_pass_converted(first_leaf_matches=is_import) and depth == self.previous_line.depth ): return (before or 1), 0 @@ -589,6 +634,8 @@ class EmptyLineTracker: and self.previous_line.is_class and current_line.is_triple_quoted_string ): + if Preview.no_blank_line_before_class_docstring in current_line.mode: + return 0, 1 return before, 1 if self.previous_line and self.previous_line.opens_block: @@ -599,7 +646,7 @@ class EmptyLineTracker: self, current_line: Line, before: int ) -> Tuple[int, int]: if not current_line.is_decorator: - self.previous_defs.append(current_line.depth) + self.previous_defs.append(current_line) if self.previous_line is None: # Don't insert empty lines before the first line in the file. return 0, 0 @@ -715,9 +762,11 @@ def is_line_short_enough( # noqa: C901 if not line_str: line_str = line_to_string(line) + width = str_width if mode.preview else len + if Preview.multiline_string_handling not in mode: return ( - len(line_str) <= mode.line_length + width(line_str) <= mode.line_length and "\n" not in line_str # multiline strings and not line.contains_standalone_comments() ) @@ -726,10 +775,10 @@ def is_line_short_enough( # noqa: C901 return False if "\n" not in line_str: # No multiline strings (MLS) present - return len(line_str) <= mode.line_length + return width(line_str) <= mode.line_length first, *_, last = line_str.split("\n") - if len(first) > mode.line_length or len(last) > mode.line_length: + if width(first) > mode.line_length or width(last) > mode.line_length: return False # Traverse the AST to examine the context of the multiline string (MLS), @@ -743,7 +792,7 @@ def is_line_short_enough( # noqa: C901 # store the leaves that contain parts of the MLS multiline_string_contexts: List[LN] = [] - max_level_to_update = math.inf # track the depth of the MLS + max_level_to_update: Union[int, float] = math.inf # track the depth of the MLS for i, leaf in enumerate(line.leaves): if max_level_to_update == math.inf: had_comma: Optional[int] = None @@ -830,25 +879,42 @@ def can_be_split(line: Line) -> bool: def can_omit_invisible_parens( - line: Line, + rhs: RHSResult, line_length: int, ) -> bool: - """Does `line` have a shape safe to reformat without optional parens around it? + """Does `rhs.body` have a shape safe to reformat without optional parens around it? Returns True for only a subset of potentially nice looking formattings but the point is to not return false positives that end up producing lines that are too long. """ + line = rhs.body bt = line.bracket_tracker if not bt.delimiters: # Without delimiters the optional parentheses are useless. return True max_priority = bt.max_delimiter_priority() - if bt.delimiter_count_with_priority(max_priority) > 1: + delimiter_count = bt.delimiter_count_with_priority(max_priority) + if delimiter_count > 1: # With more than one delimiter of a kind the optional parentheses read better. return False + if delimiter_count == 1: + if ( + Preview.wrap_multiple_context_managers_in_parens in line.mode + and max_priority == COMMA_PRIORITY + and rhs.head.is_with_or_async_with_stmt + ): + # For two context manager with statements, the optional parentheses read + # better. In this case, `rhs.body` is the context managers part of + # the with statement. `rhs.head` is the `with (` part on the previous + # line. + return False + # Otherwise it may also read better, but we don't do it today and requires + # careful considerations for all possible cases. See + # https://github.com/psf/black/issues/2156. + if max_priority == DOT_PRIORITY: # A single stranded method call doesn't require optional parentheses. return True