class Prism::MatchWriteNode

Represents writing local variables using a regular expression match with named capture groups.

/(?<foo>bar)/ =~ baz



attr_reader call: CallNode


attr_reader targets: Array

Public Class Methods

new(source, call, targets, location) click to toggle source

def initialize: (CallNode call, Array targets, Location location) -> void

# File prism/node.rb, line 12966
def initialize(source, call, targets, location)
  @source = source
  @location = location
  @call = call
  @targets = targets
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 prism/node.rb, line 13041
def self.type

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 prism/node.rb, line 13047
def ===(other)
  other.is_a?(MatchWriteNode) &&
    (call === &&
    (targets.length == other.targets.length) && { |left, right| left === right }
accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File prism/node.rb, line 12974
def accept(visitor)
child_nodes() click to toggle source

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

# File prism/node.rb, line 12979
def child_nodes
  [call, *targets]
Also aliased as: deconstruct
comment_targets() click to toggle source

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

# File prism/node.rb, line 12989
def comment_targets
  [call, *targets] #: Array[Prism::node | Location]
compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File prism/node.rb, line 12984
def compact_child_nodes
  [call, *targets]
copy(call:, targets: self.targets, location: self.location) click to toggle source

def copy: (?call: CallNode, ?targets: Array, ?location: Location) -> MatchWriteNode

# File prism/node.rb, line 12994
def copy(call:, targets: self.targets, location: self.location), call, targets, location)

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

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

def deconstruct_keys: (Array keys) -> { call: CallNode, targets: Array, location: Location }

# File prism/node.rb, line 13002
def deconstruct_keys(keys)
  { call: call, targets: targets, location: location }
inspect() click to toggle source

def inspect -> String

# File prism/node.rb, line 13013
def inspect
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 prism/node.rb, line 13031
def type