X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/adf4ebd2d9540dd0812e2db0e5735a5d28d31d81..c9b73b99ac567ce30c36596371bf0a1fad8191c9:/black.py diff --git a/black.py b/black.py index fdefb74..c2363e4 100644 --- a/black.py +++ b/black.py @@ -41,7 +41,7 @@ from blib2to3 import pygram, pytree from blib2to3.pgen2 import driver, token from blib2to3.pgen2.parse import ParseError -__version__ = "18.4a4" +__version__ = "18.4a6" DEFAULT_LINE_LENGTH = 88 # types @@ -192,6 +192,7 @@ def main( write_back = WriteBack.YES report = Report(check=check, quiet=quiet) if len(sources) == 0: + out("No paths given. Nothing to do 😴") ctx.exit(0) return @@ -552,19 +553,20 @@ COMPARATORS = { token.GREATEREQUAL, } MATH_OPERATORS = { + token.VBAR, + token.CIRCUMFLEX, + token.AMPER, + token.LEFTSHIFT, + token.RIGHTSHIFT, token.PLUS, token.MINUS, token.STAR, token.SLASH, - token.VBAR, - token.AMPER, + token.DOUBLESLASH, token.PERCENT, - token.CIRCUMFLEX, + token.AT, token.TILDE, - token.LEFTSHIFT, - token.RIGHTSHIFT, token.DOUBLESTAR, - token.DOUBLESLASH, } STARS = {token.STAR, token.DOUBLESTAR} VARARGS_PARENTS = { @@ -597,13 +599,44 @@ TEST_DESCENDANTS = { syms.term, syms.power, } +ASSIGNMENTS = { + "=", + "+=", + "-=", + "*=", + "@=", + "/=", + "%=", + "&=", + "|=", + "^=", + "<<=", + ">>=", + "**=", + "//=", +} COMPREHENSION_PRIORITY = 20 -COMMA_PRIORITY = 10 -TERNARY_PRIORITY = 7 -LOGIC_PRIORITY = 5 -STRING_PRIORITY = 4 -COMPARATOR_PRIORITY = 3 -MATH_PRIORITY = 1 +COMMA_PRIORITY = 18 +TERNARY_PRIORITY = 16 +LOGIC_PRIORITY = 14 +STRING_PRIORITY = 12 +COMPARATOR_PRIORITY = 10 +MATH_PRIORITIES = { + token.VBAR: 8, + token.CIRCUMFLEX: 7, + token.AMPER: 6, + token.LEFTSHIFT: 5, + token.RIGHTSHIFT: 5, + token.PLUS: 4, + token.MINUS: 4, + token.STAR: 3, + token.SLASH: 3, + token.DOUBLESLASH: 3, + token.PERCENT: 3, + token.AT: 3, + token.TILDE: 2, + token.DOUBLESTAR: 1, +} @dataclass @@ -614,8 +647,8 @@ class BracketTracker: bracket_match: Dict[Tuple[Depth, NodeType], Leaf] = Factory(dict) delimiters: Dict[LeafID, Priority] = Factory(dict) previous: Optional[Leaf] = None - _for_loop_variable: bool = False - _lambda_arguments: bool = False + _for_loop_variable: int = 0 + _lambda_arguments: int = 0 def mark(self, leaf: Leaf) -> None: """Mark `leaf` with bracket-related metadata. Keep track of delimiters. @@ -677,7 +710,7 @@ class BracketTracker: """ if leaf.type == token.NAME and leaf.value == "for": self.depth += 1 - self._for_loop_variable = True + self._for_loop_variable += 1 return True return False @@ -686,7 +719,7 @@ class BracketTracker: """See `maybe_increment_for_loop_variable` above for explanation.""" if self._for_loop_variable and leaf.type == token.NAME and leaf.value == "in": self.depth -= 1 - self._for_loop_variable = False + self._for_loop_variable -= 1 return True return False @@ -699,7 +732,7 @@ class BracketTracker: """ if leaf.type == token.NAME and leaf.value == "lambda": self.depth += 1 - self._lambda_arguments = True + self._lambda_arguments += 1 return True return False @@ -708,7 +741,7 @@ class BracketTracker: """See `maybe_increment_lambda_arguments` above for explanation.""" if self._lambda_arguments and leaf.type == token.COLON: self.depth -= 1 - self._lambda_arguments = False + self._lambda_arguments -= 1 return True return False @@ -742,6 +775,8 @@ class Line: if not has_value: return + if token.COLON == leaf.type and self.is_class_paren_empty: + del self.leaves[-2:] if self.leaves and not preformatted: # Note: at this point leaf.prefix should be empty except for # imports, for which we only preserve newlines. @@ -751,7 +786,6 @@ class Line: if self.inside_brackets or not preformatted: self.bracket_tracker.mark(leaf) self.maybe_remove_trailing_comma(leaf) - if not self.append_comment(leaf): self.leaves.append(leaf) @@ -839,6 +873,22 @@ class Line: and self.leaves[0].value == "yield" ) + @property + def is_class_paren_empty(self) -> bool: + """Is this a class with no base classes but using parentheses? + + Those are unnecessary and should be removed. + """ + return ( + bool(self) + and len(self.leaves) == 4 + and self.is_class + and self.leaves[2].type == token.LPAR + and self.leaves[2].value == "(" + and self.leaves[3].type == token.RPAR + and self.leaves[3].value == ")" + ) + def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool: """If so, needs to be split before emitting.""" for leaf in self.leaves: @@ -867,9 +917,14 @@ class Line: self.remove_trailing_comma() return True - # For parens let's check if it's safe to remove the comma. If the - # trailing one is the only one, we might mistakenly change a tuple - # into a different type by removing the comma. + # For parens let's check if it's safe to remove the comma. + # Imports are always safe. + if self.is_import: + self.remove_trailing_comma() + return True + + # Otheriwsse, if the trailing one is the only one, we might mistakenly + # change a tuple into a different type by removing the comma. depth = closing.bracket_depth + 1 commas = 0 opening = closing.opening_bracket @@ -955,8 +1010,9 @@ class Line: and subscript_start.type == syms.subscriptlist ): subscript_start = child_towards(subscript_start, leaf) - return subscript_start is not None and any( - n.type in TEST_DESCENDANTS for n in subscript_start.pre_order() + return ( + subscript_start is not None + and any(n.type in TEST_DESCENDANTS for n in subscript_start.pre_order()) ) def __str__(self) -> str: @@ -1213,14 +1269,13 @@ class LineGenerator(Visitor[Line]): """Visit a statement. This implementation is shared for `if`, `while`, `for`, `try`, `except`, - `def`, `with`, `class`, and `assert`. + `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. - `parens` holds pairs of nodes where invisible parentheses should be put. - Keys hold nodes after which opening parentheses should be put, values - hold nodes before which closing parentheses should be put. + `parens` holds a set of string leaf values immeditely after which + invisible parens should be put. """ normalize_invisible_parens(node, parens_after=parens) for child in node.children: @@ -1330,6 +1385,8 @@ class LineGenerator(Visitor[Line]): 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) + self.visit_expr_stmt = partial(v, keywords=Ø, parens=ASSIGNMENTS) + self.visit_return_stmt = partial(v, keywords={"return"}, parens={"return"}) self.visit_async_funcdef = self.visit_async_stmt self.visit_decorated = self.visit_decorators @@ -1626,7 +1683,7 @@ def is_split_before_delimiter(leaf: Leaf, previous: Leaf = None) -> int: and leaf.parent and leaf.parent.type not in {syms.factor, syms.star_expr} ): - return MATH_PRIORITY + return MATH_PRIORITIES[leaf.type] if leaf.type in COMPARATORS: return COMPARATOR_PRIORITY @@ -1807,7 +1864,8 @@ def left_hand_split(line: Line, py36: bool = False) -> Iterator[Line]: """Split line into many lines, starting with the first matching bracket pair. Note: this usually looks weird, only use this for function definitions. - Prefer RHS otherwise. + Prefer RHS otherwise. This is why this function is not symmetrical with + :func:`right_hand_split` which also handles optional parentheses. """ head = Line(depth=line.depth) body = Line(depth=line.depth + 1, inside_brackets=True) @@ -1847,7 +1905,10 @@ def left_hand_split(line: Line, py36: bool = False) -> Iterator[Line]: def right_hand_split( line: Line, py36: bool = False, omit: Collection[LeafID] = () ) -> Iterator[Line]: - """Split line into many lines, starting with the last matching bracket pair.""" + """Split line into many lines, starting with the last matching bracket pair. + + If the split was by optional parentheses, attempt splitting without them, too. + """ head = Line(depth=line.depth) body = Line(depth=line.depth + 1, inside_brackets=True) tail = Line(depth=line.depth) @@ -1886,20 +1947,25 @@ def right_hand_split( bracket_split_succeeded_or_raise(head, body, tail) assert opening_bracket and closing_bracket if ( + # the opening bracket is an optional paren opening_bracket.type == token.LPAR and not opening_bracket.value + # the closing bracket is an optional paren and closing_bracket.type == token.RPAR and not closing_bracket.value + # there are no delimiters or standalone comments in the body + and not body.bracket_tracker.delimiters + and not line.contains_standalone_comments(0) + # and it's not an import (optional parens are the only thing we can split + # on in this case; attempting a split without them is a waste of time) + and not line.is_import ): - # These parens were optional. If there aren't any delimiters or standalone - # comments in the body, they were unnecessary and another split without - # them should be attempted. - if not ( - body.bracket_tracker.delimiters or line.contains_standalone_comments(0) - ): - omit = {id(closing_bracket), *omit} + omit = {id(closing_bracket), *omit} + try: yield from right_hand_split(line, py36=py36, omit=omit) return + except CannotSplit: + pass ensure_visible(opening_bracket) ensure_visible(closing_bracket) @@ -2157,6 +2223,9 @@ def normalize_string_quotes(leaf: Leaf) -> None: def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: """Make existing optional parentheses invisible or create new ones. + `parens_after` is a set of string leaf values immeditely after which parens + should be put. + Standardizes on visible parentheses for single-element tuples, and keeps existing visible parentheses for other tuples and generator expressions. """ @@ -2164,17 +2233,7 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: for child in list(node.children): if check_lpar: if child.type == syms.atom: - if not ( - is_empty_tuple(child) - or is_one_tuple(child) - or max_delimiter_priority_in_atom(child) >= COMMA_PRIORITY - ): - first = child.children[0] - last = child.children[-1] - if first.type == token.LPAR and last.type == token.RPAR: - # make parentheses invisible - first.value = "" # type: ignore - last.value = "" # type: ignore + maybe_make_parens_invisible_in_atom(child) elif is_one_tuple(child): # wrap child in visible parentheses lpar = Leaf(token.LPAR, "(") @@ -2191,6 +2250,29 @@ 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) -> bool: + """If it's safe, make the parens in the atom `node` invisible, recusively.""" + if ( + node.type != syms.atom + or is_empty_tuple(node) + or is_one_tuple(node) + or max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY + ): + return False + + first = node.children[0] + last = node.children[-1] + if first.type == token.LPAR and last.type == token.RPAR: + # make parentheses invisible + first.value = "" # type: ignore + last.value = "" # type: ignore + if len(node.children) > 1: + maybe_make_parens_invisible_in_atom(node.children[1]) + return True + + return False + + def is_empty_tuple(node: LN) -> bool: """Return True if `node` holds an empty tuple.""" return ( @@ -2292,7 +2374,7 @@ def is_python36(node: Node) -> bool: Currently looking for: - f-strings; and - - trailing commas after * or ** in function signatures. + - trailing commas after * or ** in function signatures and calls. """ for n in node.pre_order(): if n.type == token.STRING: @@ -2301,7 +2383,7 @@ def is_python36(node: Node) -> bool: return True elif ( - n.type == syms.typedargslist + n.type in {syms.typedargslist, syms.arglist} and n.children and n.children[-1].type == token.COMMA ): @@ -2309,6 +2391,11 @@ def is_python36(node: Node) -> bool: if ch.type in STARS: return True + if ch.type == syms.argument: + for argch in ch.children: + if argch.type in STARS: + return True + return False