class Prism::DefNode

Represents a method definition.

def method
end
^^^^^^^^^^

Attributes

body[R]

attr_reader body: Node?

def_keyword_loc[R]

attr_reader def_keyword_loc: Location

end_keyword_loc[R]

attr_reader end_keyword_loc: Location?

equal_loc[R]

attr_reader equal_loc: Location?

locals[R]

attr_reader locals: Array

locals_body_index[R]

attr_reader locals_body_index: Integer

lparen_loc[R]

attr_reader lparen_loc: Location?

name[R]

attr_reader name: Symbol

name_loc[R]

attr_reader name_loc: Location

operator_loc[R]

attr_reader operator_loc: Location?

parameters[R]

attr_reader parameters: ParametersNode?

receiver[R]

attr_reader receiver: Node?

rparen_loc[R]

attr_reader rparen_loc: Location?

Public Class Methods

new(name, name_loc, receiver, parameters, body, locals, locals_body_index, def_keyword_loc, operator_loc, lparen_loc, rparen_loc, equal_loc, end_keyword_loc, location) click to toggle source

def initialize: (name: Symbol, name_loc: Location, receiver: Node?, parameters: ParametersNode?, body: Node?, locals: Array, locals_body_index: Integer, def_keyword_loc: Location, operator_loc: Location?, lparen_loc: Location?, rparen_loc: Location?, equal_loc: Location?, end_keyword_loc: Location?, location: Location) -> void

# File lib/prism/node.rb, line 5278
def initialize(name, name_loc, receiver, parameters, body, locals, locals_body_index, def_keyword_loc, operator_loc, lparen_loc, rparen_loc, equal_loc, end_keyword_loc, location)
  @name = name
  @name_loc = name_loc
  @receiver = receiver
  @parameters = parameters
  @body = body
  @locals = locals
  @locals_body_index = locals_body_index
  @def_keyword_loc = def_keyword_loc
  @operator_loc = operator_loc
  @lparen_loc = lparen_loc
  @rparen_loc = rparen_loc
  @equal_loc = equal_loc
  @end_keyword_loc = end_keyword_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 lib/prism/node.rb, line 5435
def self.type
  :def_node
end

Public Instance Methods

accept(visitor) click to toggle source

def accept: (visitor: Visitor) -> void

# File lib/prism/node.rb, line 5296
def accept(visitor)
  visitor.visit_def_node(self)
end

child_nodes() click to toggle source

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

# File lib/prism/node.rb, line 5301
def child_nodes
  [receiver, parameters, body]
end

Also aliased as: deconstruct

comment_targets() click to toggle source

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

# File lib/prism/node.rb, line 5315
def comment_targets
  [name_loc, *receiver, *parameters, *body, def_keyword_loc, *operator_loc, *lparen_loc, *rparen_loc, *equal_loc, *end_keyword_loc]
end

compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 5306
def compact_child_nodes
  compact = []
  compact << receiver if receiver
  compact << parameters if parameters
  compact << body if body
  compact
end

copy(**params) click to toggle source

def copy: (**params) -> DefNode

# File lib/prism/node.rb, line 5320
def copy(**params)
  DefNode.new(
    params.fetch(:name) { name },
    params.fetch(:name_loc) { name_loc },
    params.fetch(:receiver) { receiver },
    params.fetch(:parameters) { parameters },
    params.fetch(:body) { body },
    params.fetch(:locals) { locals },
    params.fetch(:locals_body_index) { locals_body_index },
    params.fetch(:def_keyword_loc) { def_keyword_loc },
    params.fetch(:operator_loc) { operator_loc },
    params.fetch(:lparen_loc) { lparen_loc },
    params.fetch(:rparen_loc) { rparen_loc },
    params.fetch(:equal_loc) { equal_loc },
    params.fetch(:end_keyword_loc) { end_keyword_loc },
    params.fetch(:location) { location },
  )
end

deconstruct()

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

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

# File lib/prism/node.rb, line 5343
def deconstruct_keys(keys)
  { name: name, name_loc: name_loc, receiver: receiver, parameters: parameters, body: body, locals: locals, locals_body_index: locals_body_index, def_keyword_loc: def_keyword_loc, operator_loc: operator_loc, lparen_loc: lparen_loc, rparen_loc: rparen_loc, equal_loc: equal_loc, end_keyword_loc: end_keyword_loc, location: location }
end

def_keyword() click to toggle source

def def_keyword: () -> String

# File lib/prism/node.rb, line 5348
def def_keyword
  def_keyword_loc.slice
end

end_keyword() click to toggle source

def end_keyword: () -> String?

# File lib/prism/node.rb, line 5373
def end_keyword
  end_keyword_loc&.slice
end

equal() click to toggle source

def equal: () -> String?

# File lib/prism/node.rb, line 5368
def equal
  equal_loc&.slice
end

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

def inspect(inspector: NodeInspector) -> String

# File lib/prism/node.rb, line 5378
def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector << "├── name: #{name.inspect}\n"
  inspector << "├── name_loc: #{inspector.location(name_loc)}\n"
  if (receiver = self.receiver).nil?
    inspector << "├── receiver: ∅\n"
  else
    inspector << "├── receiver:\n"
    inspector << receiver.inspect(inspector.child_inspector("│   ")).delete_prefix(inspector.prefix)
  end
  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 << "├── locals: #{locals.inspect}\n"
  inspector << "├── locals_body_index: #{locals_body_index.inspect}\n"
  inspector << "├── def_keyword_loc: #{inspector.location(def_keyword_loc)}\n"
  inspector << "├── operator_loc: #{inspector.location(operator_loc)}\n"
  inspector << "├── lparen_loc: #{inspector.location(lparen_loc)}\n"
  inspector << "├── rparen_loc: #{inspector.location(rparen_loc)}\n"
  inspector << "├── equal_loc: #{inspector.location(equal_loc)}\n"
  inspector << "└── end_keyword_loc: #{inspector.location(end_keyword_loc)}\n"
  inspector.to_str
end

lparen() click to toggle source

def lparen: () -> String?

# File lib/prism/node.rb, line 5358
def lparen
  lparen_loc&.slice
end

operator() click to toggle source

def operator: () -> String?

# File lib/prism/node.rb, line 5353
def operator
  operator_loc&.slice
end

rparen() click to toggle source

def rparen: () -> String?

# File lib/prism/node.rb, line 5363
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 lib/prism/node.rb, line 5425
def type
  :def_node
end