X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/026c81b83454f176a9f9253cbfb70be2c159d822..c2c2f7203869443965f722dae3007e0e2578e575:/black.py diff --git a/black.py b/black.py index b727666..9ecfbe1 100644 --- a/black.py +++ b/black.py @@ -68,7 +68,7 @@ LeafID = int Priority = int Index = int LN = Union[Leaf, Node] -SplitFunc = Callable[["Line", bool], Iterator["Line"]] +SplitFunc = Callable[["Line", Collection["Feature"]], Iterator["Line"]] Timestamp = float FileSize = int CacheInfo = Tuple[Timestamp, FileSize] @@ -133,31 +133,35 @@ class Feature(Enum): UNICODE_LITERALS = 1 F_STRINGS = 2 NUMERIC_UNDERSCORES = 3 - TRAILING_COMMA = 4 + TRAILING_COMMA_IN_CALL = 4 + TRAILING_COMMA_IN_DEF = 5 VERSION_TO_FEATURES: Dict[TargetVersion, Set[Feature]] = { TargetVersion.PY27: set(), TargetVersion.PY33: {Feature.UNICODE_LITERALS}, TargetVersion.PY34: {Feature.UNICODE_LITERALS}, - TargetVersion.PY35: {Feature.UNICODE_LITERALS, Feature.TRAILING_COMMA}, + TargetVersion.PY35: {Feature.UNICODE_LITERALS, Feature.TRAILING_COMMA_IN_CALL}, TargetVersion.PY36: { Feature.UNICODE_LITERALS, Feature.F_STRINGS, Feature.NUMERIC_UNDERSCORES, - Feature.TRAILING_COMMA, + Feature.TRAILING_COMMA_IN_CALL, + Feature.TRAILING_COMMA_IN_DEF, }, TargetVersion.PY37: { Feature.UNICODE_LITERALS, Feature.F_STRINGS, Feature.NUMERIC_UNDERSCORES, - Feature.TRAILING_COMMA, + Feature.TRAILING_COMMA_IN_CALL, + Feature.TRAILING_COMMA_IN_DEF, }, TargetVersion.PY38: { Feature.UNICODE_LITERALS, Feature.F_STRINGS, Feature.NUMERIC_UNDERSCORES, - Feature.TRAILING_COMMA, + Feature.TRAILING_COMMA_IN_CALL, + Feature.TRAILING_COMMA_IN_DEF, }, } @@ -522,12 +526,14 @@ async def schedule_formatting( manager = Manager() lock = manager.Lock() tasks = { - loop.run_in_executor( - executor, format_file_in_place, src, fast, mode, write_back, lock + asyncio.ensure_future( + loop.run_in_executor( + executor, format_file_in_place, src, fast, mode, write_back, lock + ) ): src for src in sorted(sources) } - pending: Iterable[asyncio.Task] = tasks.keys() + pending: Iterable[asyncio.Future] = tasks.keys() try: loop.add_signal_handler(signal.SIGINT, cancel, pending) loop.add_signal_handler(signal.SIGTERM, cancel, pending) @@ -683,6 +689,11 @@ def format_str(src_contents: str, *, mode: FileMode) -> FileContent: elt = EmptyLineTracker(is_pyi=mode.is_pyi) empty_line = Line() after = 0 + split_line_features = { + feature + for feature in {Feature.TRAILING_COMMA_IN_CALL, Feature.TRAILING_COMMA_IN_DEF} + if supports_feature(versions, feature) + } for current_line in lines.visit(src_node): for _ in range(after): dst_contents += str(empty_line) @@ -690,9 +701,7 @@ def format_str(src_contents: str, *, mode: FileMode) -> FileContent: for _ in range(before): dst_contents += str(empty_line) for line in split_line( - current_line, - line_length=mode.line_length, - supports_trailing_commas=supports_feature(versions, Feature.TRAILING_COMMA), + current_line, line_length=mode.line_length, features=split_line_features ): dst_contents += str(line) return dst_contents @@ -715,24 +724,20 @@ def decode_bytes(src: bytes) -> Tuple[FileContent, Encoding, NewLine]: return tiow.read(), encoding, newline -GRAMMARS = [ - pygram.python_grammar_no_print_statement_no_exec_statement, - pygram.python_grammar_no_print_statement, - pygram.python_grammar, -] - - def get_grammars(target_versions: Set[TargetVersion]) -> List[Grammar]: if not target_versions: - return GRAMMARS - elif all(not version.is_python2() for version in target_versions): - # Python 2-compatible code, so don't try Python 3 grammar. + # No target_version specified, so try all grammars. return [ pygram.python_grammar_no_print_statement_no_exec_statement, pygram.python_grammar_no_print_statement, + pygram.python_grammar, ] + elif all(version.is_python2() for version in target_versions): + # Python 2-only code, so try Python 2 grammars. + return [pygram.python_grammar_no_print_statement, pygram.python_grammar] else: - return [pygram.python_grammar] + # Python 3-compatible code, so only try Python 3 grammar. + return [pygram.python_grammar_no_print_statement_no_exec_statement] def lib2to3_parse(src_txt: str, target_versions: Iterable[TargetVersion] = ()) -> Node: @@ -2162,7 +2167,7 @@ def split_line( line: Line, line_length: int, inner: bool = False, - supports_trailing_commas: bool = False, + features: Collection[Feature] = (), ) -> Iterator[Line]: """Split a `line` into potentially many lines. @@ -2171,7 +2176,7 @@ def split_line( current `line`, possibly transitively. This means we can fallback to splitting by delimiters if the LHS/RHS don't yield any results. - If `supports_trailing_commas` is True, splitting may use the TRAILING_COMMA feature. + `features` are syntactical features that may be used in the output. """ if line.is_comment: yield line @@ -2192,13 +2197,9 @@ def split_line( split_funcs = [left_hand_split] else: - def rhs(line: Line, supports_trailing_commas: bool = False) -> Iterator[Line]: + def rhs(line: Line, features: Collection[Feature]) -> Iterator[Line]: for omit in generate_trailers_to_omit(line, line_length): - lines = list( - right_hand_split( - line, line_length, supports_trailing_commas, omit=omit - ) - ) + lines = list(right_hand_split(line, line_length, features, omit=omit)) if is_line_short_enough(lines[0], line_length=line_length): yield from lines return @@ -2206,7 +2207,7 @@ def split_line( # All splits failed, best effort split with no omits. # This mostly happens to multiline strings that are by definition # reported as not fitting a single line. - yield from right_hand_split(line, supports_trailing_commas) + yield from right_hand_split(line, line_length, features=features) if line.inside_brackets: split_funcs = [delimiter_split, standalone_comment_split, rhs] @@ -2218,16 +2219,13 @@ def split_line( # split altogether. result: List[Line] = [] try: - for l in split_func(line, supports_trailing_commas): + for l in split_func(line, features): if str(l).strip("\n") == line_str: raise CannotSplit("Split function returned an unchanged result") result.extend( split_line( - l, - line_length=line_length, - inner=True, - supports_trailing_commas=supports_trailing_commas, + l, line_length=line_length, inner=True, features=features ) ) except CannotSplit: @@ -2241,9 +2239,7 @@ def split_line( yield line -def left_hand_split( - line: Line, supports_trailing_commas: bool = False -) -> Iterator[Line]: +def left_hand_split(line: Line, features: Collection[Feature] = ()) -> 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. @@ -2282,7 +2278,7 @@ def left_hand_split( def right_hand_split( line: Line, line_length: int, - supports_trailing_commas: bool = False, + features: Collection[Feature] = (), omit: Collection[LeafID] = (), ) -> Iterator[Line]: """Split line into many lines, starting with the last matching bracket pair. @@ -2341,12 +2337,7 @@ def right_hand_split( ): omit = {id(closing_bracket), *omit} try: - yield from right_hand_split( - line, - line_length, - supports_trailing_commas=supports_trailing_commas, - omit=omit, - ) + yield from right_hand_split(line, line_length, features=features, omit=omit) return except CannotSplit: @@ -2414,10 +2405,17 @@ def bracket_split_build_line( if leaves: # Since body is a new indent level, remove spurious leading whitespace. normalize_prefix(leaves[0], inside_brackets=True) - # Ensure a trailing comma when expected. + # Ensure a trailing comma for imports, but be careful not to add one after + # any comments. if original.is_import: - if leaves[-1].type != token.COMMA: - leaves.append(Leaf(token.COMMA, ",")) + for i in range(len(leaves) - 1, -1, -1): + if leaves[i].type == STANDALONE_COMMENT: + continue + elif leaves[i].type == token.COMMA: + break + else: + leaves.insert(i + 1, Leaf(token.COMMA, ",")) + break # Populate the line for leaf in leaves: result.append(leaf, preformatted=True) @@ -2435,10 +2433,8 @@ def dont_increase_indentation(split_func: SplitFunc) -> SplitFunc: """ @wraps(split_func) - def split_wrapper( - line: Line, supports_trailing_commas: bool = False - ) -> Iterator[Line]: - for l in split_func(line, supports_trailing_commas): + def split_wrapper(line: Line, features: Collection[Feature] = ()) -> Iterator[Line]: + for l in split_func(line, features): normalize_prefix(l.leaves[0], inside_brackets=True) yield l @@ -2446,13 +2442,11 @@ def dont_increase_indentation(split_func: SplitFunc) -> SplitFunc: @dont_increase_indentation -def delimiter_split( - line: Line, supports_trailing_commas: bool = False -) -> Iterator[Line]: +def delimiter_split(line: Line, features: Collection[Feature] = ()) -> Iterator[Line]: """Split according to delimiters of the highest priority. - If `supports_trailing_commas` is True, the split will add trailing commas - also in function signatures that contain `*` and `**`. + If the appropriate Features are given, the split will add trailing commas + also in function signatures and calls that contain `*` and `**`. """ try: last_leaf = line.leaves[-1] @@ -2491,10 +2485,16 @@ def delimiter_split( yield from append_to_line(comment_after) lowest_depth = min(lowest_depth, leaf.bracket_depth) - if leaf.bracket_depth == lowest_depth and is_vararg( - leaf, within=VARARGS_PARENTS - ): - trailing_comma_safe = trailing_comma_safe and supports_trailing_commas + if leaf.bracket_depth == lowest_depth: + if is_vararg(leaf, within={syms.typedargslist}): + trailing_comma_safe = ( + trailing_comma_safe and Feature.TRAILING_COMMA_IN_DEF in features + ) + elif is_vararg(leaf, within={syms.arglist, syms.argument}): + trailing_comma_safe = ( + trailing_comma_safe and Feature.TRAILING_COMMA_IN_CALL in features + ) + leaf_priority = bt.delimiters.get(id(leaf)) if leaf_priority == delimiter_priority: yield current_line @@ -2513,7 +2513,7 @@ def delimiter_split( @dont_increase_indentation def standalone_comment_split( - line: Line, supports_trailing_commas: bool = False + line: Line, features: Collection[Feature] = () ) -> Iterator[Line]: """Split standalone comments from the rest of the line.""" if not line.contains_standalone_comments(0): @@ -3063,14 +3063,19 @@ def get_features_used(node: Node) -> Set[Feature]: and n.children and n.children[-1].type == token.COMMA ): + if n.type == syms.typedargslist: + feature = Feature.TRAILING_COMMA_IN_DEF + else: + feature = Feature.TRAILING_COMMA_IN_CALL + for ch in n.children: if ch.type in STARS: - features.add(Feature.TRAILING_COMMA) + features.add(feature) if ch.type == syms.argument: for argch in ch.children: if argch.type in STARS: - features.add(Feature.TRAILING_COMMA) + features.add(feature) return features @@ -3150,7 +3155,7 @@ def get_future_imports(node: Node) -> Set[str]: elif child.type == syms.import_as_names: yield from get_imports_from_children(child.children) else: - assert False, "Invalid syntax parsing imports" + raise AssertionError("Invalid syntax parsing imports") for child in node.children: if child.type != syms.simple_stmt: @@ -3390,7 +3395,7 @@ def assert_equivalent(src: str, dst: str) -> None: log = dump_to_file("".join(traceback.format_tb(exc.__traceback__)), dst) raise AssertionError( f"INTERNAL ERROR: Black produced invalid code: {exc}. " - f"Please report a bug on https://github.com/ambv/black/issues. " + f"Please report a bug on https://github.com/python/black/issues. " f"This invalid output might be helpful: {log}" ) from None @@ -3401,7 +3406,7 @@ def assert_equivalent(src: str, dst: str) -> None: raise AssertionError( f"INTERNAL ERROR: Black produced code that is not equivalent to " f"the source. " - f"Please report a bug on https://github.com/ambv/black/issues. " + f"Please report a bug on https://github.com/python/black/issues. " f"This diff might be helpful: {log}" ) from None @@ -3417,7 +3422,7 @@ def assert_stable(src: str, dst: str, mode: FileMode) -> None: raise AssertionError( f"INTERNAL ERROR: Black produced different code on the second pass " f"of the formatter. " - f"Please report a bug on https://github.com/ambv/black/issues. " + f"Please report a bug on https://github.com/python/black/issues. " f"This diff might be helpful: {log}" ) from None