+++ /dev/null
-"""Builds on top of nodes.py to track brackets."""
-
-from dataclasses import dataclass, field
-from typing import Dict, Final, Iterable, List, Optional, Sequence, Set, Tuple, Union
-
-from black.nodes import (
- BRACKET,
- CLOSING_BRACKETS,
- COMPARATORS,
- LOGIC_OPERATORS,
- MATH_OPERATORS,
- OPENING_BRACKETS,
- UNPACKING_PARENTS,
- VARARGS_PARENTS,
- is_vararg,
- syms,
-)
-from blib2to3.pgen2 import token
-from blib2to3.pytree import Leaf, Node
-
-# types
-LN = Union[Leaf, Node]
-Depth = int
-LeafID = int
-NodeType = int
-Priority = int
-
-
-COMPREHENSION_PRIORITY: Final = 20
-COMMA_PRIORITY: Final = 18
-TERNARY_PRIORITY: Final = 16
-LOGIC_PRIORITY: Final = 14
-STRING_PRIORITY: Final = 12
-COMPARATOR_PRIORITY: Final = 10
-MATH_PRIORITIES: Final = {
- token.VBAR: 9,
- token.CIRCUMFLEX: 8,
- token.AMPER: 7,
- token.LEFTSHIFT: 6,
- token.RIGHTSHIFT: 6,
- token.PLUS: 5,
- token.MINUS: 5,
- token.STAR: 4,
- token.SLASH: 4,
- token.DOUBLESLASH: 4,
- token.PERCENT: 4,
- token.AT: 4,
- token.TILDE: 3,
- token.DOUBLESTAR: 2,
-}
-DOT_PRIORITY: Final = 1
-
-
-class BracketMatchError(Exception):
- """Raised when an opening bracket is unable to be matched to a closing bracket."""
-
-
-@dataclass
-class BracketTracker:
- """Keeps track of brackets on a line."""
-
- depth: int = 0
- bracket_match: Dict[Tuple[Depth, NodeType], Leaf] = field(default_factory=dict)
- delimiters: Dict[LeafID, Priority] = field(default_factory=dict)
- previous: Optional[Leaf] = None
- _for_loop_depths: List[int] = field(default_factory=list)
- _lambda_argument_depths: List[int] = field(default_factory=list)
- invisible: List[Leaf] = field(default_factory=list)
-
- def mark(self, leaf: Leaf) -> None:
- """Mark `leaf` with bracket-related metadata. Keep track of delimiters.
-
- All leaves receive an int `bracket_depth` field that stores how deep
- within brackets a given leaf is. 0 means there are no enclosing brackets
- that started on this line.
-
- If a leaf is itself a closing bracket and there is a matching opening
- bracket earlier, it receives an `opening_bracket` field with which it forms a
- pair. This is a one-directional link to avoid reference cycles. Closing
- bracket without opening happens on lines continued from previous
- breaks, e.g. `) -> "ReturnType":` as part of a funcdef where we place
- the return type annotation on its own line of the previous closing RPAR.
-
- If a leaf is a delimiter (a token on which Black can split the line if
- needed) and it's on depth 0, its `id()` is stored in the tracker's
- `delimiters` field.
- """
- if leaf.type == token.COMMENT:
- return
-
- if (
- self.depth == 0
- and leaf.type in CLOSING_BRACKETS
- and (self.depth, leaf.type) not in self.bracket_match
- ):
- return
-
- self.maybe_decrement_after_for_loop_variable(leaf)
- self.maybe_decrement_after_lambda_arguments(leaf)
- if leaf.type in CLOSING_BRACKETS:
- self.depth -= 1
- try:
- opening_bracket = self.bracket_match.pop((self.depth, leaf.type))
- except KeyError as e:
- raise BracketMatchError(
- "Unable to match a closing bracket to the following opening"
- f" bracket: {leaf}"
- ) from e
- leaf.opening_bracket = opening_bracket
- if not leaf.value:
- self.invisible.append(leaf)
- leaf.bracket_depth = self.depth
- if self.depth == 0:
- delim = is_split_before_delimiter(leaf, self.previous)
- if delim and self.previous is not None:
- self.delimiters[id(self.previous)] = delim
- else:
- delim = is_split_after_delimiter(leaf, self.previous)
- if delim:
- self.delimiters[id(leaf)] = delim
- if leaf.type in OPENING_BRACKETS:
- self.bracket_match[self.depth, BRACKET[leaf.type]] = leaf
- self.depth += 1
- if not leaf.value:
- self.invisible.append(leaf)
- self.previous = leaf
- self.maybe_increment_lambda_arguments(leaf)
- self.maybe_increment_for_loop_variable(leaf)
-
- def any_open_brackets(self) -> bool:
- """Return True if there is an yet unmatched open bracket on the line."""
- return bool(self.bracket_match)
-
- def max_delimiter_priority(self, exclude: Iterable[LeafID] = ()) -> Priority:
- """Return the highest priority of a delimiter found on the line.
-
- Values are consistent with what `is_split_*_delimiter()` return.
- Raises ValueError on no delimiters.
- """
- return max(v for k, v in self.delimiters.items() if k not in exclude)
-
- def delimiter_count_with_priority(self, priority: Priority = 0) -> int:
- """Return the number of delimiters with the given `priority`.
-
- If no `priority` is passed, defaults to max priority on the line.
- """
- if not self.delimiters:
- return 0
-
- priority = priority or self.max_delimiter_priority()
- return sum(1 for p in self.delimiters.values() if p == priority)
-
- def maybe_increment_for_loop_variable(self, leaf: Leaf) -> bool:
- """In a for loop, or comprehension, the variables are often unpacks.
-
- To avoid splitting on the comma in this situation, increase the depth of
- tokens between `for` and `in`.
- """
- if leaf.type == token.NAME and leaf.value == "for":
- self.depth += 1
- self._for_loop_depths.append(self.depth)
- return True
-
- return False
-
- def maybe_decrement_after_for_loop_variable(self, leaf: Leaf) -> bool:
- """See `maybe_increment_for_loop_variable` above for explanation."""
- if (
- self._for_loop_depths
- and self._for_loop_depths[-1] == self.depth
- and leaf.type == token.NAME
- and leaf.value == "in"
- ):
- self.depth -= 1
- self._for_loop_depths.pop()
- return True
-
- return False
-
- def maybe_increment_lambda_arguments(self, leaf: Leaf) -> bool:
- """In a lambda expression, there might be more than one argument.
-
- To avoid splitting on the comma in this situation, increase the depth of
- tokens between `lambda` and `:`.
- """
- if leaf.type == token.NAME and leaf.value == "lambda":
- self.depth += 1
- self._lambda_argument_depths.append(self.depth)
- return True
-
- return False
-
- def maybe_decrement_after_lambda_arguments(self, leaf: Leaf) -> bool:
- """See `maybe_increment_lambda_arguments` above for explanation."""
- if (
- self._lambda_argument_depths
- and self._lambda_argument_depths[-1] == self.depth
- and leaf.type == token.COLON
- ):
- self.depth -= 1
- self._lambda_argument_depths.pop()
- return True
-
- return False
-
- def get_open_lsqb(self) -> Optional[Leaf]:
- """Return the most recent opening square bracket (if any)."""
- return self.bracket_match.get((self.depth - 1, token.RSQB))
-
-
-def is_split_after_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> Priority:
- """Return the priority of the `leaf` delimiter, given a line break after it.
-
- The delimiter priorities returned here are from those delimiters that would
- cause a line break after themselves.
-
- Higher numbers are higher priority.
- """
- if leaf.type == token.COMMA:
- return COMMA_PRIORITY
-
- return 0
-
-
-def is_split_before_delimiter(leaf: Leaf, previous: Optional[Leaf] = None) -> Priority:
- """Return the priority of the `leaf` delimiter, given a line break before it.
-
- The delimiter priorities returned here are from those delimiters that would
- cause a line break before themselves.
-
- Higher numbers are higher priority.
- """
- if is_vararg(leaf, within=VARARGS_PARENTS | UNPACKING_PARENTS):
- # * and ** might also be MATH_OPERATORS but in this case they are not.
- # Don't treat them as a delimiter.
- return 0
-
- if (
- leaf.type == token.DOT
- and leaf.parent
- and leaf.parent.type not in {syms.import_from, syms.dotted_name}
- and (previous is None or previous.type in CLOSING_BRACKETS)
- ):
- return DOT_PRIORITY
-
- if (
- leaf.type in MATH_OPERATORS
- and leaf.parent
- and leaf.parent.type not in {syms.factor, syms.star_expr}
- ):
- return MATH_PRIORITIES[leaf.type]
-
- if leaf.type in COMPARATORS:
- return COMPARATOR_PRIORITY
-
- if (
- leaf.type == token.STRING
- and previous is not None
- and previous.type == token.STRING
- ):
- return STRING_PRIORITY
-
- if leaf.type not in {token.NAME, token.ASYNC}:
- return 0
-
- if (
- leaf.value == "for"
- and leaf.parent
- and leaf.parent.type in {syms.comp_for, syms.old_comp_for}
- or leaf.type == token.ASYNC
- ):
- if (
- not isinstance(leaf.prev_sibling, Leaf)
- or leaf.prev_sibling.value != "async"
- ):
- return COMPREHENSION_PRIORITY
-
- if (
- leaf.value == "if"
- and leaf.parent
- and leaf.parent.type in {syms.comp_if, syms.old_comp_if}
- ):
- return COMPREHENSION_PRIORITY
-
- if leaf.value in {"if", "else"} and leaf.parent and leaf.parent.type == syms.test:
- return TERNARY_PRIORITY
-
- if leaf.value == "is":
- return COMPARATOR_PRIORITY
-
- if (
- leaf.value == "in"
- and leaf.parent
- and leaf.parent.type in {syms.comp_op, syms.comparison}
- and not (
- previous is not None
- and previous.type == token.NAME
- and previous.value == "not"
- )
- ):
- return COMPARATOR_PRIORITY
-
- if (
- leaf.value == "not"
- and leaf.parent
- and leaf.parent.type == syms.comp_op
- and not (
- previous is not None
- and previous.type == token.NAME
- and previous.value == "is"
- )
- ):
- return COMPARATOR_PRIORITY
-
- if leaf.value in LOGIC_OPERATORS and leaf.parent:
- return LOGIC_PRIORITY
-
- return 0
-
-
-def max_delimiter_priority_in_atom(node: LN) -> Priority:
- """Return maximum delimiter priority inside `node`.
-
- This is specific to atoms with contents contained in a pair of parentheses.
- If `node` isn't an atom or there are no enclosing parentheses, returns 0.
- """
- if node.type != syms.atom:
- return 0
-
- first = node.children[0]
- last = node.children[-1]
- if not (first.type == token.LPAR and last.type == token.RPAR):
- return 0
-
- bt = BracketTracker()
- for c in node.children[1:-1]:
- if isinstance(c, Leaf):
- bt.mark(c)
- else:
- for leaf in c.leaves():
- bt.mark(leaf)
- try:
- return bt.max_delimiter_priority()
-
- except ValueError:
- return 0
-
-
-def get_leaves_inside_matching_brackets(leaves: Sequence[Leaf]) -> Set[LeafID]:
- """Return leaves that are inside matching brackets.
-
- The input `leaves` can have non-matching brackets at the head or tail parts.
- Matching brackets are included.
- """
- try:
- # Start with the first opening bracket and ignore closing brackets before.
- start_index = next(
- i for i, l in enumerate(leaves) if l.type in OPENING_BRACKETS
- )
- except StopIteration:
- return set()
- bracket_stack = []
- ids = set()
- for i in range(start_index, len(leaves)):
- leaf = leaves[i]
- if leaf.type in OPENING_BRACKETS:
- bracket_stack.append((BRACKET[leaf.type], i))
- if leaf.type in CLOSING_BRACKETS:
- if bracket_stack and leaf.type == bracket_stack[-1][0]:
- _, start = bracket_stack.pop()
- for j in range(start, i + 1):
- ids.add(id(leaves[j]))
- else:
- break
- return ids
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