class Prism::LambdaNode
Represents using a lambda literal (not the lambda method call).
->(value) { value * 2 } ^^^^^^^^^^^^^^^^^^^^^^^
Attributes
attr_reader body: Prism::node?
attr_reader locals: Array
attr_reader parameters: Prism::node?
Public Class Methods
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
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
def accept: (Visitor
visitor) -> void
# File lib/prism/node.rb, line 11585 def accept(visitor) visitor.visit_lambda_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File lib/prism/node.rb, line 11590 def child_nodes [parameters, body] end
def closing: () -> String
# File lib/prism/node.rb, line 11662 def closing closing_loc.slice end
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
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
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
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
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
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
def opening: () -> String
# File lib/prism/node.rb, line 11657 def opening opening_loc.slice end
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
def operator: () -> String
# File lib/prism/node.rb, line 11652 def operator operator_loc.slice end
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
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