class Prism::AliasMethodNode

Represents the use of the ‘alias` keyword to alias a method.

alias foo bar



attr_reader new_name: Prism::node


attr_reader old_name: Prism::node

Public Class Methods

new(source, new_name, old_name, keyword_loc, location) click to toggle source

def initialize: (Prism::node new_name, Prism::node old_name, Location keyword_loc, Location location) -> void

# File prism/node.rb, line 295
def initialize(source, new_name, old_name, keyword_loc, location)
  @source = source
  @location = location
  @new_name = new_name
  @old_name = old_name
  @keyword_loc = keyword_loc
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 383
def self.type

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 389
def ===(other)
  other.is_a?(AliasMethodNode) &&
    (new_name === other.new_name) &&
    (old_name === other.old_name) &&
    (keyword_loc.nil? == other.keyword_loc.nil?)
accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File prism/node.rb, line 304
def accept(visitor)
child_nodes() click to toggle source

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

# File prism/node.rb, line 309
def child_nodes
  [new_name, old_name]
Also aliased as: deconstruct
comment_targets() click to toggle source

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

# File prism/node.rb, line 319
def comment_targets
  [new_name, old_name, keyword_loc] #: Array[Prism::node | Location]
compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File prism/node.rb, line 314
def compact_child_nodes
  [new_name, old_name]
copy(new_name: self.new_name, old_name: self.old_name, keyword_loc: self.keyword_loc, location: self.location) click to toggle source

def copy: (?new_name: Prism::node, ?old_name: Prism::node, ?keyword_loc: Location, ?location: Location) -> AliasMethodNode

# File prism/node.rb, line 324
def copy(new_name: self.new_name, old_name: self.old_name, keyword_loc: self.keyword_loc, location: self.location), new_name, old_name, keyword_loc, location)

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

Alias for: child_nodes
deconstruct_keys(keys) click to toggle source

def deconstruct_keys: (Array keys) -> { new_name: Prism::node, old_name: Prism::node, keyword_loc: Location, location: Location }

# File prism/node.rb, line 332
def deconstruct_keys(keys)
  { new_name: new_name, old_name: old_name, keyword_loc: keyword_loc, location: location }
inspect() click to toggle source

def inspect -> String

# File prism/node.rb, line 355
def inspect
keyword() click to toggle source

def keyword: () -> String

# File prism/node.rb, line 350
def keyword
keyword_loc() click to toggle source

attr_reader keyword_loc: Location

# File prism/node.rb, line 343
def keyword_loc
  location = @keyword_loc
  return location if location.is_a?(Location)
  @keyword_loc =, location >> 32, location & 0xFFFFFFFF)
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 373
def type