class Prism::MultiTargetNode

Represents a multi-target expression.

a, (b, c) = 1, 2, 3
   ^^^^^^

Attributes

lefts[R]

rest[R]

attr_reader rest: Prism::node?

rights[R]

Public Class Methods

new(source, lefts, rest, rights, lparen_loc, rparen_loc, location) click to toggle source

# File prism/node.rb, line 13278
def initialize(source, lefts, rest, rights, lparen_loc, rparen_loc, location)
  @source = source
  @location = location
  @lefts = lefts
  @rest = rest
  @rights = rights
  @lparen_loc = lparen_loc
  @rparen_loc = rparen_loc
end

type() click to toggle source

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 13399
def self.type
  :multi_target_node
end

Public Instance Methods

===(other) click to toggle source

Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.

# File prism/node.rb, line 13405
def ===(other)
  other.is_a?(MultiTargetNode) &&
    (lefts.length == other.lefts.length) &&
    lefts.zip(other.lefts).all? { |left, right| left === right } &&
    (rest === other.rest) &&
    (rights.length == other.rights.length) &&
    rights.zip(other.rights).all? { |left, right| left === right } &&
    (lparen_loc.nil? == other.lparen_loc.nil?) &&
    (rparen_loc.nil? == other.rparen_loc.nil?)
end

accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File prism/node.rb, line 13289
def accept(visitor)
  visitor.visit_multi_target_node(self)
end

child_nodes() click to toggle source

def child_nodes: () -> Array[nil | Node]

# File prism/node.rb, line 13294
def child_nodes
  [*lefts, rest, *rights]
end

Also aliased as: deconstruct

comment_targets() click to toggle source

def comment_targets: () -> Array[Node | Location]

# File prism/node.rb, line 13308
def comment_targets
  [*lefts, *rest, *rights, *lparen_loc, *rparen_loc] #: Array[Prism::node | Location]
end

compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File prism/node.rb, line 13299
def compact_child_nodes
  compact = [] #: Array[Prism::node]
  compact.concat(lefts)
  compact << rest if rest
  compact.concat(rights)
  compact
end

copy(lefts: self.lefts, rest: self.rest, rights: self.rights, lparen_loc: self.lparen_loc, rparen_loc: self.rparen_loc, location: self.location) click to toggle source

# File prism/node.rb, line 13313
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

deconstruct()

def deconstruct: () -> Array[nil | Node]

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

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 prism/node.rb, line 13321
def deconstruct_keys(keys)
  { lefts: lefts, rest: rest, rights: rights, lparen_loc: lparen_loc, rparen_loc: rparen_loc, location: location }
end

inspect() click to toggle source

def inspect -> String

# File prism/node.rb, line 13371
def inspect
  InspectVisitor.compose(self)
end

lparen() click to toggle source

def lparen: () -> String?

# File prism/node.rb, line 13361
def lparen
  lparen_loc&.slice
end

lparen_loc() click to toggle source

attr_reader lparen_loc: Location?

# File prism/node.rb, line 13335
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

rparen() click to toggle source

def rparen: () -> String?

# File prism/node.rb, line 13366
def rparen
  rparen_loc&.slice
end

rparen_loc() click to toggle source

attr_reader rparen_loc: Location?

# File prism/node.rb, line 13348
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

type() click to toggle source

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 13389
def type
  :multi_target_node
end