class Prism::PinnedExpressionNode

Represents the use of the ‘^` operator for pinning an expression in a pattern matching expression.

foo in ^(bar)
       ^^^^^^

Attributes

expression[R]

attr_reader expression: Prism::node

Public Class Methods

new(source, expression, operator_loc, lparen_loc, rparen_loc, location) click to toggle source

def initialize: (Prism::node expression, Location operator_loc, Location lparen_loc, Location rparen_loc, Location location) -> void

# File lib/prism/node.rb, line 14795
def initialize(source, expression, operator_loc, lparen_loc, rparen_loc, location)
  @source = source
  @location = location
  @expression = expression
  @operator_loc = operator_loc
  @lparen_loc = lparen_loc
  @rparen_loc = rparen_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 14905
def self.type
  :pinned_expression_node
end

Public Instance Methods

===(other) click to toggle source

Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.

# File lib/prism/node.rb, line 14911
def ===(other)
  other.is_a?(PinnedExpressionNode) &&
    (expression === other.expression) &&
    (operator_loc.nil? == other.operator_loc.nil?) &&
    (lparen_loc.nil? == other.lparen_loc.nil?) &&
    (rparen_loc.nil? == other.rparen_loc.nil?)
end
accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File lib/prism/node.rb, line 14805
def accept(visitor)
  visitor.visit_pinned_expression_node(self)
end
child_nodes() click to toggle source

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

# File lib/prism/node.rb, line 14810
def child_nodes
  [expression]
end
Also aliased as: deconstruct
comment_targets() click to toggle source

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

# File lib/prism/node.rb, line 14820
def comment_targets
  [expression, operator_loc, lparen_loc, rparen_loc] #: Array[Prism::node | Location]
end
compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File lib/prism/node.rb, line 14815
def compact_child_nodes
  [expression]
end
copy(expression: self.expression, operator_loc: self.operator_loc, lparen_loc: self.lparen_loc, rparen_loc: self.rparen_loc, location: self.location) click to toggle source

def copy: (?expression: Prism::node, ?operator_loc: Location, ?lparen_loc: Location, ?rparen_loc: Location, ?location: Location) -> PinnedExpressionNode

# File lib/prism/node.rb, line 14825
def copy(expression: self.expression, operator_loc: self.operator_loc, lparen_loc: self.lparen_loc, rparen_loc: self.rparen_loc, location: self.location)
  PinnedExpressionNode.new(source, expression, operator_loc, lparen_loc, rparen_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) -> { expression: Prism::node, operator_loc: Location, lparen_loc: Location, rparen_loc: Location, location: Location }

# File lib/prism/node.rb, line 14833
def deconstruct_keys(keys)
  { expression: expression, operator_loc: operator_loc, lparen_loc: lparen_loc, rparen_loc: rparen_loc, location: location }
end
inspect() click to toggle source

def inspect -> String

# File lib/prism/node.rb, line 14877
def inspect
  InspectVisitor.compose(self)
end
lparen() click to toggle source

def lparen: () -> String

# File lib/prism/node.rb, line 14867
def lparen
  lparen_loc.slice
end
lparen_loc() click to toggle source

attr_reader lparen_loc: Location

# File lib/prism/node.rb, line 14848
def lparen_loc
  location = @lparen_loc
  return location if location.is_a?(Location)
  @lparen_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
operator() click to toggle source

def operator: () -> String

# File lib/prism/node.rb, line 14862
def operator
  operator_loc.slice
end
operator_loc() click to toggle source

attr_reader operator_loc: Location

# File lib/prism/node.rb, line 14841
def operator_loc
  location = @operator_loc
  return location if location.is_a?(Location)
  @operator_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end
rparen() click to toggle source

def rparen: () -> String

# File lib/prism/node.rb, line 14872
def rparen
  rparen_loc.slice
end
rparen_loc() click to toggle source

attr_reader rparen_loc: Location

# File lib/prism/node.rb, line 14855
def rparen_loc
  location = @rparen_loc
  return location if location.is_a?(Location)
  @rparen_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 14895
def type
  :pinned_expression_node
end