class Prism::LambdaNode

Represents using a lambda literal (not the lambda method call).

->(value) { value * 2 }
^^^^^^^^^^^^^^^^^^^^^^^

Attributes

body[R]

attr_reader body: Prism::node?

locals[R]

attr_reader locals: Array

parameters[R]

attr_reader parameters: Prism::node?

Public Class Methods

new(source, locals, operator_loc, opening_loc, closing_loc, parameters, body, location) click to toggle source

def initialize: (Array locals, Location operator_loc, Location opening_loc, Location closing_loc, Prism::node? parameters, Prism::node? body, Location location) -> void

# File lib/prism/node.rb, line 11572
def initialize(source, locals, operator_loc, opening_loc, closing_loc, parameters, body, location)
  @source = source
  @newline = false
  @location = location
  @locals = locals
  @operator_loc = operator_loc
  @opening_loc = opening_loc
  @closing_loc = closing_loc
  @parameters = parameters
  @body = body
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 lib/prism/node.rb, line 11712
def self.type
  :lambda_node
end

Public Instance Methods

accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File lib/prism/node.rb, line 11585
def accept(visitor)
  visitor.visit_lambda_node(self)
end
child_nodes() click to toggle source

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

# File lib/prism/node.rb, line 11590
def child_nodes
  [parameters, body]
end
Also aliased as: deconstruct
closing() click to toggle source

def closing: () -> String

# File lib/prism/node.rb, line 11662
def closing
  closing_loc.slice
end
closing_loc() click to toggle source

attr_reader closing_loc: Location

# File lib/prism/node.rb, line 11638
def closing_loc
  location = @closing_loc
  return location if location.is_a?(Location)
  @closing_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
comment_targets() click to toggle source

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

# File lib/prism/node.rb, line 11603
def comment_targets
  [operator_loc, opening_loc, closing_loc, *parameters, *body] #: Array[Prism::node | Location]
end
compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 11595
def compact_child_nodes
  compact = [] #: Array[Prism::node]
  compact << parameters if parameters
  compact << body if body
  compact
end
copy(locals: self.locals, operator_loc: self.operator_loc, opening_loc: self.opening_loc, closing_loc: self.closing_loc, parameters: self.parameters, body: self.body, location: self.location) click to toggle source

def copy: (?locals: Array, ?operator_loc: Location, ?opening_loc: Location, ?closing_loc: Location, ?parameters: Prism::node?, ?body: Prism::node?, ?location: Location) -> LambdaNode

# File lib/prism/node.rb, line 11608
def copy(locals: self.locals, operator_loc: self.operator_loc, opening_loc: self.opening_loc, closing_loc: self.closing_loc, parameters: self.parameters, body: self.body, location: self.location)
  LambdaNode.new(source, locals, operator_loc, opening_loc, closing_loc, parameters, body, location)
end
deconstruct()

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

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

def deconstruct_keys: (Array keys) -> { locals: Array, operator_loc: Location, opening_loc: Location, closing_loc: Location, parameters: Prism::node?, body: Prism::node?, location: Location }

# File lib/prism/node.rb, line 11616
def deconstruct_keys(keys)
  { locals: locals, operator_loc: operator_loc, opening_loc: opening_loc, closing_loc: closing_loc, parameters: parameters, body: body, location: location }
end
inspect(inspector = NodeInspector.new) click to toggle source

def inspect(NodeInspector inspector) -> String

# File lib/prism/node.rb, line 11667
def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector << "├── locals: #{locals.inspect}\n"
  inspector << "├── operator_loc: #{inspector.location(operator_loc)}\n"
  inspector << "├── opening_loc: #{inspector.location(opening_loc)}\n"
  inspector << "├── closing_loc: #{inspector.location(closing_loc)}\n"
  if (parameters = self.parameters).nil?
    inspector << "├── parameters: ∅\n"
  else
    inspector << "├── parameters:\n"
    inspector << parameters.inspect(inspector.child_inspector("│   ")).delete_prefix(inspector.prefix)
  end
  if (body = self.body).nil?
    inspector << "└── body: ∅\n"
  else
    inspector << "└── body:\n"
    inspector << body.inspect(inspector.child_inspector("    ")).delete_prefix(inspector.prefix)
  end
  inspector.to_str
end
opening() click to toggle source

def opening: () -> String

# File lib/prism/node.rb, line 11657
def opening
  opening_loc.slice
end
opening_loc() click to toggle source

attr_reader opening_loc: Location

# File lib/prism/node.rb, line 11631
def opening_loc
  location = @opening_loc
  return location if location.is_a?(Location)
  @opening_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
operator() click to toggle source

def operator: () -> String

# File lib/prism/node.rb, line 11652
def operator
  operator_loc.slice
end
operator_loc() click to toggle source

attr_reader operator_loc: Location

# File lib/prism/node.rb, line 11624
def operator_loc
  location = @operator_loc
  return location if location.is_a?(Location)
  @operator_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
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 lib/prism/node.rb, line 11702
def type
  :lambda_node
end