# File lib/treetop/compiler/metagrammar.rb, line 873 def _nt_parsing_expression start_index = index if node_cache[:parsing_expression].has_key?(index) cached = node_cache[:parsing_expression][index] @index = cached.interval.end if cached return cached end i0 = index r1 = _nt_choice if r1 r0 = r1 else r2 = _nt_sequence if r2 r0 = r2 else r3 = _nt_primary if r3 r0 = r3 else self.index = i0 r0 = nil end end end node_cache[:parsing_expression][start_index] = r0 return r0 end