class Prism::InNode

Represents the use of the ‘in` keyword in a case statement.

case a; in b then c end



attr_reader in_loc: Location


attr_reader pattern: Node


attr_reader statements: StatementsNode?


attr_reader then_loc: Location?

Public Class Methods

new(pattern, statements, in_loc, then_loc, location) click to toggle source

def initialize: (pattern: Node, statements: StatementsNode?, in_loc: Location, then_loc: Location?, location: Location) -> void

# File lib/prism/node.rb, line 7967
def initialize(pattern, statements, in_loc, then_loc, location)
  @pattern = pattern
  @statements = statements
  @in_loc = in_loc
  @then_loc = then_loc
  @location = location
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 8067
def self.type

Public Instance Methods

accept(visitor) click to toggle source

def accept: (visitor: Visitor) -> void

# File lib/prism/node.rb, line 7976
def accept(visitor)
child_nodes() click to toggle source

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

# File lib/prism/node.rb, line 7981
def child_nodes
  [pattern, statements]
Also aliased as: deconstruct
comment_targets() click to toggle source

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

# File lib/prism/node.rb, line 7994
def comment_targets
  [pattern, *statements, in_loc, *then_loc]
compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 7986
def compact_child_nodes
  compact = []
  compact << pattern
  compact << statements if statements
copy(**params) click to toggle source

def copy: (**params) -> InNode

# File lib/prism/node.rb, line 7999
def copy(**params)
    params.fetch(:pattern) { pattern },
    params.fetch(:statements) { statements },
    params.fetch(:in_loc) { in_loc },
    params.fetch(:then_loc) { then_loc },
    params.fetch(:location) { location },
deconstruct() click to toggle source

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

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

def deconstruct_keys: (keys: Array) -> Hash[Symbol, nil | Node | Array | String | Token | Array | Location]

# File lib/prism/node.rb, line 8013
def deconstruct_keys(keys)
  { pattern: pattern, statements: statements, in_loc: in_loc, then_loc: then_loc, location: location }
in() click to toggle source

def in: () -> String

# File lib/prism/node.rb, line 8018
def in
inspect(inspector = click to toggle source

def inspect(inspector: NodeInspector) -> String

# File lib/prism/node.rb, line 8028
def inspect(inspector =
  inspector << inspector.header(self)
  inspector << "├── pattern:\n"
  inspector << inspector.child_node(pattern, "│   ")
  if (statements = self.statements).nil?
    inspector << "├── statements: ∅\n"
    inspector << "├── statements:\n"
    inspector << statements.inspect(inspector.child_inspector("│   ")).delete_prefix(inspector.prefix)
  inspector << "├── in_loc: #{inspector.location(in_loc)}\n"
  inspector << "└── then_loc: #{inspector.location(then_loc)}\n"
then() click to toggle source

def then: () -> String?

# File lib/prism/node.rb, line 8023
def then
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 8057
def type