class Prism::ImplicitNode
Represents a node that is implicitly being added to the tree but doesn’t correspond directly to a node in the source.
{ foo: } ^^^^ { Foo: } ^^^^
Attributes
attr_reader value: Node
Public Class Methods
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 8032 def self.type :implicit_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 7965 def accept(visitor) visitor.visit_implicit_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 7970 def child_nodes [value] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 7980 def comment_targets [value] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 7975 def compact_child_nodes [value] end
def copy: (**params) -> ImplicitNode
# File prism/node.rb, line 7985 def copy(**params) ImplicitNode.new( params.fetch(:value) { value }, params.fetch(:location) { location }, ) end
def inspect(inspector: NodeInspector) -> String
# File prism/node.rb, line 8001 def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) inspector << "└── value:\n" inspector << inspector.child_node(value, " ") inspector.to_str 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 8022 def type :implicit_node end