# File lib/mail/parsers/rfc2045.rb, line 205 def _nt_ietf_token start_index = index if node_cache[:ietf_token].has_key?(index) cached = node_cache[:ietf_token][index] @index = cached.interval.end if cached return cached end s0, i0 = [], index loop do r1 = _nt_token if r1 s0 << r1 else break end end if s0.empty? @index = i0 r0 = nil else r0 = instantiate_node(SyntaxNode,input, i0...index, s0) end node_cache[:ietf_token][start_index] = r0 r0 end