Represents a multi-target expression.
a, (b, c) = 1, 2, 3 ^^^^^^
attr_reader lparen_loc: Location?
attr_reader rparen_loc: Location?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12127
def initialize(lefts, rest, rights, lparen_loc, rparen_loc, location)
@lefts = lefts
@rest = rest
@rights = rights
@lparen_loc = lparen_loc
@rparen_loc = rparen_loc
@location = location
end
def initialize: (lefts: Array, rest: Node?, rights: Array, lparen_loc: Location?, rparen_loc: Location?, location: Location) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12230
def self.type
:multi_target_node
end
Similar to type, this method returns a symbol that you can use for splitting on the type of the node without having to do a long === chain. Note that like type, it will still be slower than using == for a single class, but should be faster in a case statement or an array comparison.
def self.type: () -> Symbol
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12137
def accept(visitor)
visitor.visit_multi_target_node(self)
end
def accept: (visitor: Visitor) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12142
def child_nodes
[*lefts, rest, *rights]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12156
def comment_targets
[*lefts, *rest, *rights, *lparen_loc, *rparen_loc]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12147
def compact_child_nodes
compact = []
compact.concat(lefts)
compact << rest if rest
compact.concat(rights)
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12161
def copy(**params)
MultiTargetNode.new(
params.fetch(:lefts) { lefts },
params.fetch(:rest) { rest },
params.fetch(:rights) { rights },
params.fetch(:lparen_loc) { lparen_loc },
params.fetch(:rparen_loc) { rparen_loc },
params.fetch(:location) { location },
)
end
def copy: (**params) -> MultiTargetNode
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12176
def deconstruct_keys(keys)
{ lefts: lefts, rest: rest, rights: rights, lparen_loc: lparen_loc, rparen_loc: rparen_loc, location: location }
end
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12191
def inspect(inspector = NodeInspector.new)
inspector << inspector.header(self)
inspector << "├── lefts: #{inspector.list("#{inspector.prefix}│ ", lefts)}"
if (rest = self.rest).nil?
inspector << "├── rest: ∅\n"
else
inspector << "├── rest:\n"
inspector << rest.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix)
end
inspector << "├── rights: #{inspector.list("#{inspector.prefix}│ ", rights)}"
inspector << "├── lparen_loc: #{inspector.location(lparen_loc)}\n"
inspector << "└── rparen_loc: #{inspector.location(rparen_loc)}\n"
inspector.to_str
end
def inspect(inspector: NodeInspector) -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12181
def lparen
lparen_loc&.slice
end
def lparen: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12186
def rparen
rparen_loc&.slice
end
def rparen: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 12220
def type
:multi_target_node
end
Sometimes you want to check an instance of a node against a list of classes to see what kind of behavior to perform. Usually this is done by calling ‘[cls1, cls2].include?(node.class)` or putting the node into a case statement and doing `case node; when cls1; when cls2; end`. Both of these approaches are relatively slow because of the constant lookups, method calls, and/or array allocations.
Instead, you can call type, which will return to you a symbol that you can use for comparison. This is faster than the other approaches because it uses a single integer comparison, but also because if you’re on CRuby you can take advantage of the fact that case statements with all symbol keys will use a jump table.
def type: () -> Symbol