is_rpar_token,
is_stub_body,
is_stub_suite,
+ is_tuple_containing_walrus,
is_vararg,
is_walrus_assignment,
is_yield,
get_string_prefix,
normalize_string_prefix,
normalize_string_quotes,
+ normalize_unicode_escape_sequences,
)
from black.trans import (
CannotTransform,
in ways that will no longer stringify to valid Python code on the tree.
"""
- def __init__(self, mode: Mode) -> None:
+ def __init__(self, mode: Mode, features: Collection[Feature]) -> None:
self.mode = mode
+ self.features = features
self.current_line: Line
self.__post_init__()
`parens` holds a set of string leaf values immediately after which
invisible parens should be put.
"""
- normalize_invisible_parens(node, parens_after=parens, preview=self.mode.preview)
+ normalize_invisible_parens(
+ node, parens_after=parens, mode=self.mode, features=self.features
+ )
for child in node.children:
if is_name_token(child) and child.value in keywords:
yield from self.line()
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)
+ normalize_invisible_parens(
+ node, parens_after=set(), mode=self.mode, features=self.features
+ )
yield from self.line()
for child in node.children:
yield from self.visit_default(node)
def visit_STRING(self, leaf: Leaf) -> Iterator[Line]:
+ if Preview.hex_codes_in_unicode_sequences in self.mode:
+ normalize_unicode_escape_sequences(leaf)
+
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.
def normalize_invisible_parens(
- node: Node, parens_after: Set[str], *, preview: bool
+ node: Node, parens_after: Set[str], *, mode: Mode, features: Collection[Feature]
) -> None:
"""Make existing optional parentheses invisible or create new ones.
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, preview=preview):
+ for pc in list_comments(node.prefix, is_endmarker=False, preview=mode.preview):
if pc.value in FMT_OFF:
# This `node` has a prefix with `# fmt: off`, don't mess with parens.
return
+
+ # The multiple context managers grammar has a different pattern, thus this is
+ # separate from the for-loop below. This possibly wraps them in invisible parens,
+ # and later will be removed in remove_with_parens when needed.
+ if node.type == syms.with_stmt:
+ _maybe_wrap_cms_in_parens(node, mode, features)
+
check_lpar = False
for index, child in enumerate(list(node.children)):
# 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, preview=preview
+ child, parens_after=parens_after, mode=mode, features=features
)
# Add parentheses around long tuple unpacking in assignments.
if check_lpar:
if (
- preview
+ mode.preview
and child.type == syms.atom
and node.type == syms.for_stmt
and isinstance(child.prev_sibling, Leaf)
remove_brackets_around_comma=True,
):
wrap_in_parentheses(node, child, visible=False)
- elif preview and isinstance(child, Node) and node.type == syms.with_stmt:
+ elif (
+ mode.preview and isinstance(child, Node) and node.type == syms.with_stmt
+ ):
remove_with_parens(child, node)
elif child.type == syms.atom:
if maybe_make_parens_invisible_in_atom(
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 is_lpar_token(child):
- assert is_rpar_token(node.children[-1])
- # make parentheses invisible
- child.value = ""
- node.children[-1].value = ""
- elif child.type != token.STAR:
- # insert invisible parentheses
- node.insert_child(index, Leaf(token.LPAR, ""))
- node.append_child(Leaf(token.RPAR, ""))
+ _normalize_import_from(node, child, index)
break
elif (
index == 1
elif not (isinstance(child, Leaf) and is_multiline_string(child)):
wrap_in_parentheses(node, child, visible=False)
- comma_check = child.type == token.COMMA if preview else False
+ comma_check = child.type == token.COMMA if mode.preview else False
check_lpar = isinstance(child, Leaf) and (
child.value in parens_after or comma_check
)
+def _normalize_import_from(parent: Node, child: LN, index: int) -> None:
+ # "import from" nodes store parentheses directly as part of
+ # the statement
+ if is_lpar_token(child):
+ assert is_rpar_token(parent.children[-1])
+ # make parentheses invisible
+ child.value = ""
+ parent.children[-1].value = ""
+ elif child.type != token.STAR:
+ # insert invisible parentheses
+ parent.insert_child(index, Leaf(token.LPAR, ""))
+ parent.append_child(Leaf(token.RPAR, ""))
+
+
def remove_await_parens(node: Node) -> None:
if node.children[0].type == token.AWAIT and len(node.children) > 1:
if (
remove_await_parens(bracket_contents)
+def _maybe_wrap_cms_in_parens(
+ node: Node, mode: Mode, features: Collection[Feature]
+) -> None:
+ """When enabled and safe, wrap the multiple context managers in invisible parens.
+
+ It is only safe when `features` contain Feature.PARENTHESIZED_CONTEXT_MANAGERS.
+ """
+ if (
+ Feature.PARENTHESIZED_CONTEXT_MANAGERS not in features
+ or Preview.wrap_multiple_context_managers_in_parens not in mode
+ or len(node.children) <= 2
+ # If it's an atom, it's already wrapped in parens.
+ or node.children[1].type == syms.atom
+ ):
+ return
+ colon_index: Optional[int] = None
+ for i in range(2, len(node.children)):
+ if node.children[i].type == token.COLON:
+ colon_index = i
+ break
+ if colon_index is not None:
+ lpar = Leaf(token.LPAR, "")
+ rpar = Leaf(token.RPAR, "")
+ context_managers = node.children[1:colon_index]
+ for child in context_managers:
+ child.remove()
+ # After wrapping, the with_stmt will look like this:
+ # with_stmt
+ # NAME 'with'
+ # atom
+ # LPAR ''
+ # testlist_gexp
+ # ... <-- context_managers
+ # /testlist_gexp
+ # RPAR ''
+ # /atom
+ # COLON ':'
+ new_child = Node(
+ syms.atom, [lpar, Node(syms.testlist_gexp, context_managers), rpar]
+ )
+ node.insert_child(1, new_child)
+
+
def remove_with_parens(node: Node, parent: Node) -> None:
"""Recursively hide optional parens in `with` statements."""
# Removing all unnecessary parentheses in with statements in one pass is a tad
not remove_brackets_around_comma
and max_delimiter_priority_in_atom(node) >= COMMA_PRIORITY
)
+ or is_tuple_containing_walrus(node)
):
return False
syms.return_stmt,
syms.except_clause,
syms.funcdef,
+ syms.with_stmt,
# these ones aren't useful to end users, but they do please fuzzers
syms.for_stmt,
syms.del_stmt,
+ syms.for_stmt,
]:
return False
projects / etc / vim.git / blobdiff