class Prism::AlternationPatternNode

Represents an alternation pattern in pattern matching.

foo => bar | baz
       ^^^^^^^^^

Attributes

left[R]

attr_reader left: Prism::node

right[R]

attr_reader right: Prism::node

Public Class Methods

new(source, left, right, operator_loc, location) click to toggle source

def initialize: (Prism::node left, Prism::node right, Location operator_loc, Location location) -> void

# File lib/prism/node.rb, line 335
def initialize(source, left, right, operator_loc, location)
  @source = source
  @newline = false
  @location = location
  @left = left
  @right = right
  @operator_loc = operator_loc
end
type() click to toggle source

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 431
def self.type
  :alternation_pattern_node
end

Public Instance Methods

accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File lib/prism/node.rb, line 345
def accept(visitor)
  visitor.visit_alternation_pattern_node(self)
end
child_nodes() click to toggle source

def child_nodes: () -> Array[nil | Node]

# File lib/prism/node.rb, line 350
def child_nodes
  [left, right]
end
Also aliased as: deconstruct
comment_targets() click to toggle source

def comment_targets: () -> Array[Node | Location]

# File lib/prism/node.rb, line 360
def comment_targets
  [left, right, operator_loc] #: Array[Prism::node | Location]
end
compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 355
def compact_child_nodes
  [left, right]
end
copy(left: self.left, right: self.right, operator_loc: self.operator_loc, location: self.location) click to toggle source

def copy: (?left: Prism::node, ?right: Prism::node, ?operator_loc: Location, ?location: Location) -> AlternationPatternNode

# File lib/prism/node.rb, line 365
def copy(left: self.left, right: self.right, operator_loc: self.operator_loc, location: self.location)
  AlternationPatternNode.new(source, left, right, operator_loc, location)
end
deconstruct()

def deconstruct: () -> Array[nil | Node]

Alias for: child_nodes
deconstruct_keys(keys) click to toggle source

def deconstruct_keys: (Array keys) -> { left: Prism::node, right: Prism::node, operator_loc: Location, location: Location }

# File lib/prism/node.rb, line 373
def deconstruct_keys(keys)
  { left: left, right: right, operator_loc: operator_loc, location: location }
end
inspect(inspector = NodeInspector.new) click to toggle source

def inspect(NodeInspector inspector) -> String

# File lib/prism/node.rb, line 397
def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector << "├── left:\n"
  inspector << inspector.child_node(left, "│   ")
  inspector << "├── right:\n"
  inspector << inspector.child_node(right, "│   ")
  inspector << "└── operator_loc: #{inspector.location(operator_loc)}\n"
  inspector.to_str
end
operator() click to toggle source

def operator: () -> String

# File lib/prism/node.rb, line 392
def operator
  operator_loc.slice
end
operator_loc() click to toggle source

attr_reader operator_loc: Location

# File lib/prism/node.rb, line 384
def operator_loc
  location = @operator_loc
  return location if location.is_a?(Location)
  @operator_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
type() click to toggle source

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 421
def type
  :alternation_pattern_node
end