Represents a block’s parameters declaration.
-> (a, b = 1; local) { }
^^^^^^^^^^^^^^^^^
foo do |a, b = 1; local|
^^^^^^^^^^^^^^^^^
end
attr_reader closing_loc: Location?
attr_reader opening_loc: Location?
attr_reader parameters: ParametersNode?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1758
def initialize(parameters, locals, opening_loc, closing_loc, location)
@parameters = parameters
@locals = locals
@opening_loc = opening_loc
@closing_loc = closing_loc
@location = location
end
def initialize: (parameters: ParametersNode?, locals: Array, opening_loc: Location?, closing_loc: Location?, location: Location) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1857
def self.type
:block_parameters_node
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 tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1767
def accept(visitor)
visitor.visit_block_parameters_node(self)
end
def accept: (visitor: Visitor) -> void
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1772
def child_nodes
[parameters, *locals]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1814
def closing
closing_loc&.slice
end
def closing: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1785
def comment_targets
[*parameters, *locals, *opening_loc, *closing_loc]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1777
def compact_child_nodes
compact = []
compact << parameters if parameters
compact.concat(locals)
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1790
def copy(**params)
BlockParametersNode.new(
params.fetch(:parameters) { parameters },
params.fetch(:locals) { locals },
params.fetch(:opening_loc) { opening_loc },
params.fetch(:closing_loc) { closing_loc },
params.fetch(:location) { location },
)
end
def copy: (**params) -> BlockParametersNode
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1804
def deconstruct_keys(keys)
{ parameters: parameters, locals: locals, opening_loc: opening_loc, closing_loc: closing_loc, location: location }
end
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1819
def inspect(inspector = NodeInspector.new)
inspector << inspector.header(self)
if (parameters = self.parameters).nil?
inspector << "├── parameters: ∅\n"
else
inspector << "├── parameters:\n"
inspector << parameters.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix)
end
inspector << "├── locals: #{inspector.list("#{inspector.prefix}│ ", locals)}"
inspector << "├── opening_loc: #{inspector.location(opening_loc)}\n"
inspector << "└── closing_loc: #{inspector.location(closing_loc)}\n"
inspector.to_str
end
def inspect(inspector: NodeInspector) -> String
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1809
def opening
opening_loc&.slice
end
def opening: () -> String?
# File tmp/rubies/ruby-3.3.0/lib/prism/node.rb, line 1847
def type
:block_parameters_node
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