# File lib/mail/parsers/rfc2822.rb, line 2153 def _nt_domain start_index = index if node_cache[:domain].has_key?(index) cached = node_cache[:domain][index] if cached cached = SyntaxNode.new(input, index...(index + 1)) if cached == true @index = cached.interval.end end return cached end i0 = index r1 = _nt_dot_atom if r1 r0 = r1 else r2 = _nt_domain_literal if r2 r0 = r2 else r3 = _nt_obs_domain if r3 r0 = r3 else @index = i0 r0 = nil end end end node_cache[:domain][start_index] = r0 r0 end