class Prism::MatchWriteNode
Represents writing local variables using a regular expression match with named capture groups.
/(?<foo>bar)/ =~ baz ^^^^^^^^^^^^^^^^^^^^
Attributes
attr_reader call: CallNode
attr_reader targets: Array
Public Class Methods
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 11888 def self.type :match_write_node end
Public Instance Methods
def accept: (visitor: Visitor
) -> void
# File prism/node.rb, line 11819 def accept(visitor) visitor.visit_match_write_node(self) end
def child_nodes
: () -> Array[nil | Node]
# File prism/node.rb, line 11824 def child_nodes [call, *targets] end
def comment_targets
: () -> Array[Node | Location]
# File prism/node.rb, line 11834 def comment_targets [call, *targets] end
def compact_child_nodes
: () -> Array
# File prism/node.rb, line 11829 def compact_child_nodes [call, *targets] end
def copy: (**params) -> MatchWriteNode
# File prism/node.rb, line 11839 def copy(**params) MatchWriteNode.new( params.fetch(:call) { call }, params.fetch(:targets) { targets }, params.fetch(:location) { location }, ) end
def inspect(inspector: NodeInspector) -> String
# File prism/node.rb, line 11856 def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) inspector << "├── call:\n" inspector << inspector.child_node(call, "│ ") inspector << "└── targets: #{inspector.list("#{inspector.prefix} ", targets)}" inspector.to_str 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 11878 def type :match_write_node end