Represents the use of the splat operator.
[*a] ^^
attr_reader expression: Prism::node?
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17208
def initialize(source, operator_loc, expression, location)
@source = source
@location = location
@operator_loc = operator_loc
@expression = expression
end
def initialize: (Location operator_loc, Prism::node? expression, Location location) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17294
def self.type
:splat_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-3.4.0-preview1/lib/prism/node.rb, line 17300
def ===(other)
other.is_a?(SplatNode) &&
(operator_loc.nil? == other.operator_loc.nil?) &&
(expression === other.expression)
end
Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17216
def accept(visitor)
visitor.visit_splat_node(self)
end
def accept: (Visitor visitor) -> void
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17221
def child_nodes
[expression]
end
def child_nodes: () -> Array[nil | Node]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17233
def comment_targets
[operator_loc, *expression] #: Array[Prism::node | Location]
end
def comment_targets: () -> Array[Node | Location]
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17226
def compact_child_nodes
compact = [] #: Array[Prism::node]
compact << expression if expression
compact
end
def compact_child_nodes: () -> Array
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17238
def copy(operator_loc: self.operator_loc, expression: self.expression, location: self.location)
SplatNode.new(source, operator_loc, expression, location)
end
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17246
def deconstruct_keys(keys)
{ operator_loc: operator_loc, expression: expression, location: location }
end
def deconstruct_keys: (Array keys) -> { operator_loc: Location, expression: Prism::node?, location: Location }
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17266
def inspect
InspectVisitor.compose(self)
end
def inspect -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17261
def operator
operator_loc.slice
end
def operator: () -> String
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17251
def operator_loc
location = @operator_loc
return location if location.is_a?(Location)
@operator_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
attr_reader operator_loc: Location
# File tmp/rubies/ruby-3.4.0-preview1/lib/prism/node.rb, line 17284
def type
:splat_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