class Prism::BlockArgumentNode
Represents block method arguments.
bar(&args) ^^^^^^^^^^
Attributes
attr_reader expression: Prism::node?
Public Class Methods
def initialize: (Prism::node? expression, Location
operator_loc
, Location
location) -> void
# File lib/prism/node.rb, line 1474 def initialize(source, expression, operator_loc, location) @source = source @newline = false @location = location @expression = expression @operator_loc = operator_loc 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 1570 def self.type :block_argument_node end
Public Instance Methods
def accept: (Visitor
visitor) -> void
# File lib/prism/node.rb, line 1483 def accept(visitor) visitor.visit_block_argument_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File lib/prism/node.rb, line 1488 def child_nodes [expression] end
def comment_targets
: () -> Array[Node | Location]
# File lib/prism/node.rb, line 1500 def comment_targets [*expression, operator_loc] #: Array[Prism::node | Location] end
def compact_child_nodes
: () -> Array
# File lib/prism/node.rb, line 1493 def compact_child_nodes compact = [] #: Array[Prism::node] compact << expression if expression compact end
def copy: (?expression: Prism::node?, ?operator_loc: Location
, ?location: Location
) -> BlockArgumentNode
# File lib/prism/node.rb, line 1505 def copy(expression: self.expression, operator_loc: self.operator_loc, location: self.location) BlockArgumentNode.new(source, expression, operator_loc, location) end
def deconstruct_keys
: (Array keys) -> { expression: Prism::node?, operator_loc
: Location
, location: Location
}
# File lib/prism/node.rb, line 1513 def deconstruct_keys(keys) { expression: expression, operator_loc: operator_loc, location: location } end
def inspect(NodeInspector inspector) -> String
# File lib/prism/node.rb, line 1534 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 lib/prism/node.rb, line 1529 def operator operator_loc.slice end
attr_reader operator_loc
: Location
# File lib/prism/node.rb, line 1521 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 1560 def type :block_argument_node end