class Prism::MultiTargetNode
Represents a multi-target expression.
a, (b, c) = 1, 2, 3 ^^^^^^
Attributes
attr_reader lefts: Array
attr_reader lparen_loc
: Location
?
attr_reader rest: Node
?
attr_reader rights: Array
attr_reader rparen_loc
: Location
?
Public Class Methods
def initialize: (lefts: Array, rest: Node
?, rights: Array, lparen_loc
: Location
?, rparen_loc
: Location
?, location: Location
) -> void
# File 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
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 prism/node.rb, line 12230 def self.type :multi_target_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 12137 def accept(visitor) visitor.visit_multi_target_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 12142 def child_nodes [*lefts, rest, *rights] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 12156 def comment_targets [*lefts, *rest, *rights, *lparen_loc, *rparen_loc] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 12147 def compact_child_nodes compact = [] compact.concat(lefts) compact << rest if rest compact.concat(rights) compact end
def copy: (**params) -> MultiTargetNode
# File 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 inspect(inspector: NodeInspector) -> String
# File 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 lparen: () -> String?
# File prism/node.rb, line 12181 def lparen lparen_loc&.slice end
def rparen: () -> String?
# File prism/node.rb, line 12186 def rparen rparen_loc&.slice 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
# File prism/node.rb, line 12220 def type :multi_target_node end