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# frozen_string_literal: true
module Regexp::Expression
module ReferencedExpressions
attr_accessor :referenced_expressions
def referenced_expression
referenced_expressions && referenced_expressions.first
end
def initialize_copy(orig)
exp_id = [self.class, self.starts_at]
# prevent infinite recursion for recursive subexp calls
copied = self.class.instance_eval { @copied_ref_exps ||= {} }
self.referenced_expressions =
if copied[exp_id]
orig.referenced_expressions
else
copied[exp_id] = true
orig.referenced_expressions && orig.referenced_expressions.map(&:dup)
end
copied.clear
super
end
end
Base.include ReferencedExpressions
end
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