class Prism::LambdaNode
Represents using a lambda literal (not the lambda method call).
->(value) { value * 2 } ^^^^^^^^^^^^^^^^^^^^^^^
Attributes
attr_reader body: Node
?
attr_reader closing_loc
: Location
attr_reader locals: Array
attr_reader locals_body_index
: Integer
attr_reader opening_loc
: Location
attr_reader operator_loc
: Location
attr_reader parameters: Node
?
Public Class Methods
def initialize: (locals: Array, locals_body_index
: Integer, operator_loc
: Location
, opening_loc
: Location
, closing_loc
: Location
, parameters: Node
?, body: Node
?, location: Location
) -> void
# File 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
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 10750 def self.type :lambda_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 10644 def accept(visitor) visitor.visit_lambda_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 10649 def child_nodes [parameters, body] end
def closing: () -> String
# File prism/node.rb, line 10699 def closing closing_loc.slice end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 10662 def comment_targets [operator_loc, opening_loc, closing_loc, *parameters, *body] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 10654 def compact_child_nodes compact = [] compact << parameters if parameters compact << body if body compact end
def copy: (**params) -> LambdaNode
# File 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
def deconstruct_keys
: (keys: Array) -> Hash[Symbol, nil | Node
| Array | String | Token
| Array | Location]
# File 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
def inspect(inspector: NodeInspector) -> String
# File 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
def opening: () -> String
# File prism/node.rb, line 10694 def opening opening_loc.slice end
def operator: () -> String
# File prism/node.rb, line 10689 def operator operator_loc.slice end
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 10740 def type :lambda_node end