Class: Prism::LambdaNode

Inherits:
PrismNode
  • Object
show all
Defined in:
lib/prism/node.rb,
ext/prism/api_node.c

Overview

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

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(locals, locals_body_index, operator_loc, opening_loc, closing_loc, parameters, body, location) ⇒ LambdaNode

def initialize: (locals: Array, locals_body_index: Integer, operator_loc: Location, opening_loc: Location, closing_loc: Location, parameters: Node?, body: Node?, location: Location) -> void



10632
10633
10634
10635
10636
10637
10638
10639
10640
10641
 
# File 'lib/prism/node.rb', line 10632

def initialize(locals, locals_body_index, operator_loc, opening_loc, closing_loc, parameters, body, location)
  @locals = locals
  @locals_body_index = locals_body_index
  @operator_loc = operator_loc
  @opening_loc = opening_loc
  @closing_loc = closing_loc
  @parameters = parameters
  @body = body
  @location = location
end

Instance Attribute Details

#body ⇒ Object (readonly)

attr_reader body: Node?



10629
10630
10631
 
# File 'lib/prism/node.rb', line 10629

def body
  @body
end

#closing_loc ⇒ Object (readonly)

attr_reader closing_loc: Location



10623
10624
10625
 
# File 'lib/prism/node.rb', line 10623

def closing_loc
  @closing_loc
end

#locals ⇒ Object (readonly)

attr_reader locals: Array



10611
10612
10613
 
# File 'lib/prism/node.rb', line 10611

def locals
  @locals
end

#locals_body_index ⇒ Object (readonly)

attr_reader locals_body_index: Integer



10614
10615
10616
 
# File 'lib/prism/node.rb', line 10614

def locals_body_index
  @locals_body_index
end

#opening_loc ⇒ Object (readonly)

attr_reader opening_loc: Location



10620
10621
10622
 
# File 'lib/prism/node.rb', line 10620

def opening_loc
  @opening_loc
end

#operator_loc ⇒ Object (readonly)

attr_reader operator_loc: Location



10617
10618
10619
 
# File 'lib/prism/node.rb', line 10617

def operator_loc
  @operator_loc
end

#parameters ⇒ Object (readonly)

attr_reader parameters: Node?



10626
10627
10628
 
# File 'lib/prism/node.rb', line 10626

def parameters
  @parameters
end

Class Method Details

.type ⇒ Object

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



10750
10751
10752
 
# File 'lib/prism/node.rb', line 10750

def self.type
  :lambda_node
end

Instance Method Details

#accept(visitor) ⇒ Object

def accept: (visitor: Visitor) -> void



10644
10645
10646
 
# File 'lib/prism/node.rb', line 10644

def accept(visitor)
  visitor.visit_lambda_node(self)
end

#child_nodes ⇒ Object Also known as: deconstruct

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



10649
10650
10651
 
# File 'lib/prism/node.rb', line 10649

def child_nodes
  [parameters, body]
end

#closing ⇒ Object

def closing: () -> String



10699
10700
10701
 
# File 'lib/prism/node.rb', line 10699

def closing
  closing_loc.slice
end

#comment_targets ⇒ Object

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



10662
10663
10664
 
# File 'lib/prism/node.rb', line 10662

def comment_targets
  [operator_loc, opening_loc, closing_loc, *parameters, *body]
end

#compact_child_nodes ⇒ Object

def compact_child_nodes: () -> Array



10654
10655
10656
10657
10658
10659
 
# File 'lib/prism/node.rb', line 10654

def compact_child_nodes
  compact = []
  compact << parameters if parameters
  compact << body if body
  compact
end

#copy(**params) ⇒ Object

def copy: (**params) -> LambdaNode



10667
10668
10669
10670
10671
10672
10673
10674
10675
10676
10677
10678
 
# File 'lib/prism/node.rb', line 10667

def copy(**params)
  LambdaNode.new(
    params.fetch(:locals) { locals },
    params.fetch(:locals_body_index) { locals_body_index },
    params.fetch(:operator_loc) { operator_loc },
    params.fetch(:opening_loc) { opening_loc },
    params.fetch(:closing_loc) { closing_loc },
    params.fetch(:parameters) { parameters },
    params.fetch(:body) { body },
    params.fetch(:location) { location },
  )
end

#deconstruct_keys(keys) ⇒ Object

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



10684
10685
10686
 
# File 'lib/prism/node.rb', line 10684

def deconstruct_keys(keys)
  { locals: locals, locals_body_index: locals_body_index, operator_loc: operator_loc, opening_loc: opening_loc, closing_loc: closing_loc, parameters: parameters, body: body, location: location }
end

#inspect(inspector = NodeInspector.new) ⇒ Object

def inspect(inspector: NodeInspector) -> String



10704
10705
10706
10707
10708
10709
10710
10711
10712
10713
10714
10715
10716
10717
10718
10719
10720
10721
10722
10723
10724
 
# File 'lib/prism/node.rb', line 10704

def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector << "├── locals: #{locals.inspect}\n"
  inspector << "├── locals_body_index: #{locals_body_index.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 ⇒ Object

def opening: () -> String



10694
10695
10696
 
# File 'lib/prism/node.rb', line 10694

def opening
  opening_loc.slice
end

#operator ⇒ Object

def operator: () -> String



10689
10690
10691
 
# File 'lib/prism/node.rb', line 10689

def operator
  operator_loc.slice
end

#type ⇒ Object

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



10740
10741
10742
 
# File 'lib/prism/node.rb', line 10740

def type
  :lambda_node
end