class Prism::MultiTargetNode

Represents a multi-target expression.

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

Attributes

lefts[R]

attr_reader lefts: Array

lparen_loc[R]

attr_reader lparen_loc: Location?

rest[R]

attr_reader rest: Node?

rights[R]

attr_reader rights: Array

rparen_loc[R]

attr_reader rparen_loc: Location?

Public Class Methods

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

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

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 12230
def self.type
  :multi_target_node
end

Public Instance Methods

accept(visitor) click to toggle source

def accept: (visitor: Visitor) -> void

# File prism/node.rb, line 12137
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 12142
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 12156
def comment_targets
  [*lefts, *rest, *rights, *lparen_loc, *rparen_loc]
end

compact_child_nodes() click to toggle source

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

copy(**params) click to toggle source

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

deconstruct()

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

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

# File 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

inspect(inspector = NodeInspector.new) click to toggle source

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

lparen() click to toggle source

def lparen: () -> String?

# File prism/node.rb, line 12181
def lparen
  lparen_loc&.slice
end

rparen() click to toggle source

def rparen: () -> String?

# File prism/node.rb, line 12186
def rparen
  rparen_loc&.slice
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 12220
def type
  :multi_target_node
end