class Prism::BlockArgumentNode
Represents block method arguments.
bar(&args) ^^^^^^^^^^
Attributes
attr_reader expression: Node
?
attr_reader operator_loc
: Location
Public Class Methods
def initialize: (expression: Node
?, operator_loc
: Location
, location: Location
) -> void
# File prism/node.rb, line 1311 def initialize(expression, operator_loc, location) @expression = expression @operator_loc = operator_loc @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 1398 def self.type :block_argument_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 1318 def accept(visitor) visitor.visit_block_argument_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 1323 def child_nodes [expression] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 1335 def comment_targets [*expression, operator_loc] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 1328 def compact_child_nodes compact = [] compact << expression if expression compact end
def copy: (**params) -> BlockArgumentNode
# File prism/node.rb, line 1340 def copy(**params) BlockArgumentNode.new( params.fetch(:expression) { expression }, params.fetch(:operator_loc) { operator_loc }, params.fetch(:location) { location }, ) end
def inspect(inspector: NodeInspector) -> String
# File prism/node.rb, line 1362 def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) if (expression = self.expression).nil? inspector << "├── expression: ∅\n" else inspector << "├── expression:\n" inspector << expression.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix) end inspector << "└── operator_loc: #{inspector.location(operator_loc)}\n" inspector.to_str end
def operator: () -> String
# File prism/node.rb, line 1357 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 1388 def type :block_argument_node end