Method: Interscript::Node::Rule::Sub#reverse

Defined in:
lib/interscript/node/rule/sub.rb

#reverse ⇒ Object 



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# File 'lib/interscript/node/rule/sub.rb', line 67

def reverse
  if to == :upcase
    xfrom = from.downcase
    xto = :downcase
  elsif to == :downcase
    xfrom = from.upcase
    xto = :upcase
  else
    xto, xfrom = reverse_transfer(from, to)
  end

  # A special case: sub "a", "" shouldn't be present in a reverse map
  rrun = self.reverse_run.nil? ? nil : !self.reverse_run
  if rrun.nil? && !has_assertions? &&
    (xfrom == "" ||
      (Interscript::Node::Item::String === xfrom && xfrom.data == '') ||
      (Interscript::Node::Item::Alias === xfrom && xfrom.name == :none)
    )

    rrun = true
  end

  Interscript::Node::Rule::Sub.new(xfrom, xto,
    before: before, after: after,
    not_before: not_before, not_after: not_after,

    reverse_run: rrun,

    priority: priority ? -priority : nil
  )
end