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 Visitor, syms, is_arith_like, ensure_visible
from black.nodes import is_docstring, is_empty_tuple, is_one_tuple, is_one_tuple_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
in ways that will no longer stringify to valid Python code on the tree.
"""
- def __init__(self, mode: Mode, remove_u_prefix: bool = False) -> None:
+ def __init__(self, mode: Mode) -> None:
self.mode = mode
- self.remove_u_prefix = remove_u_prefix
self.current_line: Line
self.__post_init__()
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`, `match`, `case` 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.
"""
normalize_invisible_parens(node, parens_after=parens)
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())
+
+ 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.
- docstring = normalize_string_prefix(leaf.value, self.remove_u_prefix)
+ docstring = normalize_string_prefix(leaf.value)
prefix = get_string_prefix(docstring)
docstring = docstring[len(prefix) :] # Remove the prefix
quote_char = docstring[0]
self.visit_decorated = self.visit_decorators
# PEP 634
- self.visit_match_stmt = partial(v, keywords={"match"}, parens=Ø)
- self.visit_case_block = partial(v, keywords={"case"}, parens=Ø)
+ self.visit_match_stmt = self.visit_match_case
+ self.visit_case_block = self.visit_match_case
def transform_line(
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 = []
# via type ... https://github.com/mypyc/mypyc/issues/884
rhs = type("rhs", (), {"__call__": _rhs})()
- if mode.experimental_string_processing:
+ 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
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, ""))
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
+ first.value = ""
+ last.value = ""
maybe_make_parens_invisible_in_atom(middle, parent=parent)
if is_atom_with_invisible_parens(middle):
if (
prev
and prev.type == token.COMMA
+ and leaf.opening_bracket is not None
and not is_one_tuple_between(
leaf.opening_bracket, leaf, line.leaves
)
if (
prev
and prev.type == token.COMMA
+ and leaf.opening_bracket is not None
and not is_one_tuple_between(leaf.opening_bracket, leaf, line.leaves)
):
# Never omit bracket pairs with trailing commas.
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