class Prism::FlipFlopNode
Represents the use of the ‘..` or `…` operators to create flip flops.
baz if foo .. bar ^^^^^^^^^^
Attributes
attr_reader left: Node
?
attr_reader operator_loc
: Location
attr_reader right: Node
?
Public Class Methods
def initialize: (flags: Integer, left: Node
?, right: Node
?, operator_loc
: Location
, location: Location
) -> void
# File prism/node.rb, line 6249 def initialize(flags, left, right, operator_loc, location) @flags = flags @left = left @right = right @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 6354 def self.type :flip_flop_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 6258 def accept(visitor) visitor.visit_flip_flop_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 6263 def child_nodes [left, right] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 6276 def comment_targets [*left, *right, operator_loc] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 6268 def compact_child_nodes compact = [] compact << left if left compact << right if right compact end
def copy: (**params) -> FlipFlopNode
# File prism/node.rb, line 6281 def copy(**params) FlipFlopNode.new( params.fetch(:flags) { flags }, params.fetch(:left) { left }, params.fetch(:right) { right }, params.fetch(:operator_loc) { operator_loc }, params.fetch(:location) { location }, ) end
def exclude_end?: () -> bool
# File prism/node.rb, line 6300 def exclude_end? flags.anybits?(RangeFlags::EXCLUDE_END) end
def inspect(inspector: NodeInspector) -> String
# File prism/node.rb, line 6310 def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) flags = [("exclude_end" if exclude_end?)].compact inspector << "├── flags: #{flags.empty? ? "∅" : flags.join(", ")}\n" if (left = self.left).nil? inspector << "├── left: ∅\n" else inspector << "├── left:\n" inspector << left.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix) end if (right = self.right).nil? inspector << "├── right: ∅\n" else inspector << "├── right:\n" inspector << right.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 6305 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 6344 def type :flip_flop_node end