import sys
from typing import Collection, Iterator, List, Optional, Set, Union
-from dataclasses import dataclass, field
-
-from black.nodes import WHITESPACE, STATEMENT, STANDALONE_COMMENT
+from black.nodes import WHITESPACE, RARROW, STATEMENT, STANDALONE_COMMENT
from black.nodes import ASSIGNMENTS, OPENING_BRACKETS, CLOSING_BRACKETS
-from black.nodes import Visitor, syms, first_child_is_arith, ensure_visible
-from black.nodes import is_docstring, is_empty_tuple, is_one_tuple, is_one_tuple_between
+from black.nodes import Visitor, syms, is_arith_like, ensure_visible
+from black.nodes import (
+ is_docstring,
+ is_empty_tuple,
+ is_one_tuple,
+ is_one_sequence_between,
+)
+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.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
-from black.trans import StringSplitter, StringParenWrapper, StringParenStripper
-from black.mode import Mode
-from black.mode import Feature
+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 blib2to3.pgen2 import token
"""A readable split that fits the allotted line length is impossible."""
-@dataclass
+# This isn't a dataclass because @dataclass + Generic breaks mypyc.
+# See also https://github.com/mypyc/mypyc/issues/827.
class LineGenerator(Visitor[Line]):
"""Generates reformatted Line objects. Empty lines are not emitted.
in ways that will no longer stringify to valid Python code on the tree.
"""
- mode: Mode
- remove_u_prefix: bool = False
- current_line: Line = field(init=False)
+ def __init__(self, mode: Mode) -> None:
+ self.mode = mode
+ self.current_line: Line
+ self.__post_init__()
def line(self, indent: int = 0) -> Iterator[Line]:
"""Generate a line.
"""Default `visit_*()` implementation. Recurses to children of `node`."""
if isinstance(node, Leaf):
any_open_brackets = self.current_line.bracket_tracker.any_open_brackets()
- for comment in generate_comments(node):
+ for comment in generate_comments(node, preview=self.mode.preview):
if any_open_brackets:
# any comment within brackets is subject to splitting
self.current_line.append(comment)
normalize_prefix(node, inside_brackets=any_open_brackets)
if self.mode.string_normalization and node.type == token.STRING:
- node.value = normalize_string_prefix(
- node.value, remove_u_prefix=self.remove_u_prefix
- )
+ node.value = normalize_string_prefix(node.value)
node.value = normalize_string_quotes(node.value)
if node.type == token.NUMBER:
normalize_numeric_literal(node)
"""Visit a statement.
This implementation is shared for `if`, `while`, `for`, `try`, `except`,
- `def`, `with`, `class`, `assert` and assignments.
+ `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 a set of string leaf values immediately after which
invisible parens should be put.
"""
- normalize_invisible_parens(node, parens_after=parens)
+ normalize_invisible_parens(node, parens_after=parens, preview=self.mode.preview)
for child in node.children:
- if child.type == token.NAME and child.value in keywords: # type: ignore
+ if is_name_token(child) and child.value in keywords:
yield from self.line()
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)
+
+ yield from self.line()
+ for child in node.children:
+ yield from self.visit(child)
+
def visit_suite(self, node: Node) -> Iterator[Line]:
"""Visit a suite."""
if self.mode.is_pyi and is_stub_suite(node):
def visit_simple_stmt(self, node: Node) -> Iterator[Line]:
"""Visit a statement without nested statements."""
- if first_child_is_arith(node):
- wrap_in_parentheses(node, node.children[0], visible=False)
+ prev_type: Optional[int] = None
+ for child in node.children:
+ if (prev_type is None or prev_type == token.SEMI) and is_arith_like(child):
+ wrap_in_parentheses(node, child, visible=False)
+ prev_type = child.type
+
is_suite_like = node.parent and node.parent.type in STATEMENT
if is_suite_like:
if self.mode.is_pyi and is_stub_body(node):
yield from self.line()
yield from self.visit(child)
+ def visit_power(self, node: Node) -> Iterator[Line]:
+ for idx, leaf in enumerate(node.children[:-1]):
+ next_leaf = node.children[idx + 1]
+
+ if not isinstance(leaf, Leaf):
+ continue
+
+ value = leaf.value.lower()
+ if (
+ leaf.type == token.NUMBER
+ and next_leaf.type == syms.trailer
+ # Ensure that we are in an attribute trailer
+ and next_leaf.children[0].type == token.DOT
+ # It shouldn't wrap hexadecimal, binary and octal literals
+ and not value.startswith(("0x", "0b", "0o"))
+ # It shouldn't wrap complex literals
+ and "j" not in value
+ ):
+ wrap_in_parentheses(node, leaf)
+
+ yield from self.visit_default(node)
+
def visit_SEMI(self, leaf: Leaf) -> Iterator[Line]:
"""Remove a semicolon and put the other statement on a separate line."""
yield from self.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.
- prefix = get_string_prefix(leaf.value)
- docstring = leaf.value[len(prefix) :] # Remove the prefix
+ docstring = normalize_string_prefix(leaf.value)
+ prefix = get_string_prefix(docstring)
+ docstring = docstring[len(prefix) :] # Remove the prefix
quote_char = docstring[0]
# A natural way to remove the outer quotes is to do:
# docstring = docstring.strip(quote_char)
# characters but only if they are the same as the first.
quote_len = 1 if docstring[1] != quote_char else 3
docstring = docstring[quote_len:-quote_len]
+ docstring_started_empty = not docstring
if is_multiline_string(leaf):
indent = " " * 4 * self.current_line.depth
# Odd number of tailing backslashes, add some padding to
# avoid escaping the closing string quote.
docstring += " "
- else:
- # Add some padding if the docstring is empty.
+ elif not docstring_started_empty:
docstring = " "
# We could enforce triple quotes at this point.
self.visit_try_stmt = partial(
v, keywords={"try", "except", "else", "finally"}, parens=Ø
)
- self.visit_except_clause = partial(v, keywords={"except"}, parens=Ø)
+ if self.mode.preview:
+ self.visit_except_clause = partial(
+ v, keywords={"except"}, parens={"except"}
+ )
+ 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_classdef = partial(v, keywords={"class"}, parens=Ø)
self.visit_async_funcdef = self.visit_async_stmt
self.visit_decorated = self.visit_decorators
+ # PEP 634
+ self.visit_match_stmt = self.visit_match_case
+ self.visit_case_block = self.visit_match_case
+
def transform_line(
line: Line, mode: Mode, features: Collection[Feature] = ()
and not (line.inside_brackets and line.contains_standalone_comments())
):
# Only apply basic string preprocessing, since lines shouldn't be split here.
- if mode.experimental_string_processing:
+ if Preview.string_processing in mode:
transformers = [string_merge, string_paren_strip]
else:
transformers = []
transformers = [left_hand_split]
else:
- def rhs(line: Line, features: Collection[Feature]) -> Iterator[Line]:
+ def _rhs(
+ self: object, line: Line, features: Collection[Feature]
+ ) -> Iterator[Line]:
"""Wraps calls to `right_hand_split`.
The calls increasingly `omit` right-hand trailers (bracket pairs with
line, line_length=mode.line_length, features=features
)
- if mode.experimental_string_processing:
+ # HACK: nested functions (like _rhs) compiled by mypyc don't retain their
+ # __name__ attribute which is needed in `run_transformer` further down.
+ # Unfortunately a nested class breaks mypyc too. So a class must be created
+ # via type ... https://github.com/mypyc/mypyc/issues/884
+ rhs = type("rhs", (), {"__call__": _rhs})()
+
+ if Preview.string_processing in mode:
if line.inside_brackets:
transformers = [
string_merge,
transformers = [delimiter_split, standalone_comment_split, rhs]
else:
transformers = [rhs]
+ # It's always safe to attempt hugging of power operations and pretty much every line
+ # could match.
+ transformers.append(hug_power_op)
for transform in transformers:
# We are accumulating lines in `result` because we might want to abort
# there are no standalone comments in the body
and not body.contains_standalone_comments(0)
# and we can actually remove the parens
- and can_omit_invisible_parens(body, line_length, omit_on_explode=omit)
+ and can_omit_invisible_parens(body, line_length)
):
omit = {id(closing_bracket), *omit}
try:
yield from right_hand_split(line, line_length, features=features, omit=omit)
return
- except CannotSplit:
+ except CannotSplit as e:
if not (
can_be_split(body)
or is_line_short_enough(body, line_length=line_length)
):
raise CannotSplit(
"Splitting failed, body is still too long and can't be split."
- )
+ ) from e
elif head.contains_multiline_strings() or tail.contains_multiline_strings():
raise CannotSplit(
" satisfy the splitting algorithm because the head or the tail"
" contains multiline strings which by definition never fit one"
" line."
- )
+ ) from e
ensure_visible(opening_bracket)
ensure_visible(closing_bracket)
original.is_def
and opening_bracket.value == "("
and not any(leaf.type == token.COMMA for leaf in leaves)
+ # In particular, don't add one within a parenthesized return annotation.
+ # Unfortunately the indicator we're in a return annotation (RARROW) may
+ # be defined directly in the parent node, the parent of the parent ...
+ # and so on depending on how complex the return annotation is.
+ # This isn't perfect and there's some false negatives but they are in
+ # contexts were a comma is actually fine.
+ and not any(
+ node.prev_sibling.type == RARROW
+ for node in (
+ leaves[0].parent,
+ getattr(leaves[0].parent, "parent", None),
+ )
+ if isinstance(node, Node) and isinstance(node.prev_sibling, Leaf)
+ )
)
if original.is_import or no_commas:
@wraps(split_func)
def split_wrapper(line: Line, features: Collection[Feature] = ()) -> Iterator[Line]:
- for line in split_func(line, features):
- normalize_prefix(line.leaves[0], inside_brackets=True)
- yield line
+ for split_line in split_func(line, features):
+ normalize_prefix(split_line.leaves[0], inside_brackets=True)
+ yield split_line
return split_wrapper
try:
last_leaf = line.leaves[-1]
except IndexError:
- raise CannotSplit("Line empty")
+ raise CannotSplit("Line empty") from None
bt = line.bracket_tracker
try:
delimiter_priority = bt.max_delimiter_priority(exclude={id(last_leaf)})
except ValueError:
- raise CannotSplit("No delimiters found")
+ raise CannotSplit("No delimiters found") from None
if delimiter_priority == DOT_PRIORITY:
if bt.delimiter_count_with_priority(delimiter_priority) == 1:
leaf.prefix = ""
-def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None:
+def normalize_invisible_parens(
+ node: Node, parens_after: Set[str], *, preview: bool
+) -> None:
"""Make existing optional parentheses invisible or create new ones.
`parens_after` is a set of string leaf values immediately after which parens
Standardizes on visible parentheses for single-element tuples, and keeps
existing visible parentheses for other tuples and generator expressions.
"""
- for pc in list_comments(node.prefix, is_endmarker=False):
+ for pc in list_comments(node.prefix, is_endmarker=False, preview=preview):
if pc.value in FMT_OFF:
# This `node` has a prefix with `# fmt: off`, don't mess with parens.
return
# Fixes a bug where invisible parens are not properly stripped from
# assignment statements that contain type annotations.
if isinstance(child, Node) and child.type == syms.annassign:
- normalize_invisible_parens(child, parens_after=parens_after)
+ normalize_invisible_parens(
+ child, parens_after=parens_after, preview=preview
+ )
# Add parentheses around long tuple unpacking in assignments.
if (
if check_lpar:
if child.type == syms.atom:
- if maybe_make_parens_invisible_in_atom(child, parent=node):
+ if maybe_make_parens_invisible_in_atom(
+ child,
+ parent=node,
+ preview=preview,
+ ):
wrap_in_parentheses(node, child, visible=False)
elif is_one_tuple(child):
wrap_in_parentheses(node, child, visible=True)
elif node.type == syms.import_from:
# "import from" nodes store parentheses directly as part of
# the statement
- if child.type == token.LPAR:
+ if is_lpar_token(child):
+ assert is_rpar_token(node.children[-1])
# make parentheses invisible
- child.value = "" # type: ignore
- node.children[-1].value = "" # type: ignore
+ child.value = ""
+ node.children[-1].value = ""
elif child.type != token.STAR:
# insert invisible parentheses
node.insert_child(index, Leaf(token.LPAR, ""))
check_lpar = isinstance(child, Leaf) and child.value in parens_after
-def maybe_make_parens_invisible_in_atom(node: LN, parent: LN) -> bool:
+def maybe_make_parens_invisible_in_atom(
+ node: LN,
+ parent: LN,
+ preview: 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
+ or (max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY and for_stmt_check)
):
return False
first = node.children[0]
last = node.children[-1]
- if first.type == token.LPAR and last.type == token.RPAR:
+ if is_lpar_token(first) and is_rpar_token(last):
middle = node.children[1]
# make parentheses invisible
- first.value = "" # type: ignore
- last.value = "" # type: ignore
- maybe_make_parens_invisible_in_atom(middle, parent=parent)
+ first.value = ""
+ last.value = ""
+ maybe_make_parens_invisible_in_atom(middle, parent=parent, preview=preview)
if is_atom_with_invisible_parens(middle):
# Strip the invisible parens from `middle` by replacing
if (
prev
and prev.type == token.COMMA
- and not is_one_tuple_between(
+ and leaf.opening_bracket is not None
+ and not is_one_sequence_between(
leaf.opening_bracket, leaf, line.leaves
)
):
if (
prev
and prev.type == token.COMMA
- and not is_one_tuple_between(leaf.opening_bracket, leaf, line.leaves)
+ and leaf.opening_bracket is not None
+ and not is_one_sequence_between(leaf.opening_bracket, leaf, line.leaves)
):
# Never omit bracket pairs with trailing commas.
# We need to explode on those.
result.extend(transform_line(transformed_line, mode=mode, features=features))
- if not (
- transform.__name__ == "rhs"
- and line.bracket_tracker.invisible
- and not any(bracket.value for bracket in line.bracket_tracker.invisible)
- and not line.contains_multiline_strings()
- and not result[0].contains_uncollapsable_type_comments()
- and not result[0].contains_unsplittable_type_ignore()
- and not is_line_short_enough(result[0], line_length=mode.line_length)
+ if (
+ transform.__class__.__name__ != "rhs"
+ or not line.bracket_tracker.invisible
+ or any(bracket.value for bracket in line.bracket_tracker.invisible)
+ or line.contains_multiline_strings()
+ or result[0].contains_uncollapsable_type_comments()
+ or result[0].contains_unsplittable_type_ignore()
+ or is_line_short_enough(result[0], line_length=mode.line_length)
+ # If any leaves have no parents (which _can_ occur since
+ # `transform(line)` potentially destroys the line's underlying node
+ # structure), then we can't proceed. Doing so would cause the below
+ # call to `append_leaves()` to fail.
+ or any(leaf.parent is None for leaf in line.leaves)
):
return result
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