# File lib/mail/parsers/rfc2822.rb, line 34 def _nt_DIGIT start_index = index if node_cache[:DIGIT].has_key?(index) cached = node_cache[:DIGIT][index] @index = cached.interval.end if cached return cached end if has_terminal?('\G[0-9]', true, index) r0 = instantiate_node(SyntaxNode,input, index...(index + 1)) @index += 1 else r0 = nil end node_cache[:DIGIT][start_index] = r0 r0 end