# File lib/treetop/compiler/metagrammar.rb, line 2896 def _nt_alpha_char start_index = index if node_cache[:alpha_char].has_key?(index) cached = node_cache[:alpha_char][index] @index = cached.interval.end if cached return cached end if input.index(Regexp.new('[A-Za-z_]'), index) == index r0 = instantiate_node(SyntaxNode,input, index...(index + 1)) @index += 1 else r0 = nil end node_cache[:alpha_char][start_index] = r0 return r0 end