class Prism::MultiTargetNode
Represents a multi-target expression.
a, (b, c) = 1, 2, 3 ^^^^^^
Attributes
attr_reader lefts: Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode
| NumberedReferenceReadNode]
attr_reader rest: Prism::node?
attr_reader rights: Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode]
Public Class Methods
def initialize: (Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode
| NumberedReferenceReadNode] lefts, Prism::node? rest, Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode] rights, Location
? lparen_loc
, Location
? rparen_loc
, Location
location) -> void
# File lib/prism/node.rb, line 13115 def initialize(source, lefts, rest, rights, lparen_loc, rparen_loc, location) @source = source @newline = false @location = location @lefts = lefts @rest = rest @rights = rights @lparen_loc = lparen_loc @rparen_loc = rparen_loc 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 lib/prism/node.rb, line 13249 def self.type :multi_target_node end
Public Instance Methods
def accept: (Visitor
visitor) -> void
# File lib/prism/node.rb, line 13127 def accept(visitor) visitor.visit_multi_target_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File lib/prism/node.rb, line 13132 def child_nodes [*lefts, rest, *rights] end
def comment_targets
: () -> Array[Node | Location]
# File lib/prism/node.rb, line 13146 def comment_targets [*lefts, *rest, *rights, *lparen_loc, *rparen_loc] #: Array[Prism::node | Location] end
def compact_child_nodes
: () -> Array
# File lib/prism/node.rb, line 13137 def compact_child_nodes compact = [] #: Array[Prism::node] compact.concat(lefts) compact << rest if rest compact.concat(rights) compact end
def copy: (?lefts: Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode
| NumberedReferenceReadNode], ?rest: Prism::node?, ?rights: Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode], ?lparen_loc: Location
?, ?rparen_loc: Location
?, ?location: Location
) -> MultiTargetNode
# File lib/prism/node.rb, line 13151 def copy(lefts: self.lefts, rest: self.rest, rights: self.rights, lparen_loc: self.lparen_loc, rparen_loc: self.rparen_loc, location: self.location) MultiTargetNode.new(source, lefts, rest, rights, lparen_loc, rparen_loc, location) end
def deconstruct_keys
: (Array keys) -> { lefts: Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode
| NumberedReferenceReadNode], rest: Prism::node?, rights: Array[LocalVariableTargetNode | InstanceVariableTargetNode
| ClassVariableTargetNode
| GlobalVariableTargetNode
| ConstantTargetNode
| ConstantPathTargetNode
| CallTargetNode
| IndexTargetNode
| MultiTargetNode
| RequiredParameterNode
| BackReferenceReadNode], lparen_loc
: Location
?, rparen_loc
: Location
?, location: Location
}
# File lib/prism/node.rb, line 13159 def deconstruct_keys(keys) { lefts: lefts, rest: rest, rights: rights, lparen_loc: lparen_loc, rparen_loc: rparen_loc, location: location } end
def inspect(NodeInspector inspector) -> String
# File lib/prism/node.rb, line 13210 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 lib/prism/node.rb, line 13200 def lparen lparen_loc&.slice end
attr_reader lparen_loc
: Location
?
# File lib/prism/node.rb, line 13173 def lparen_loc location = @lparen_loc case location when nil nil when Location location else @lparen_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF) end end
def rparen: () -> String
?
# File lib/prism/node.rb, line 13205 def rparen rparen_loc&.slice end
attr_reader rparen_loc
: Location
?
# File lib/prism/node.rb, line 13186 def rparen_loc location = @rparen_loc case location when nil nil when Location location else @rparen_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF) end 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 lib/prism/node.rb, line 13239 def type :multi_target_node end