Method: Treetop::Compiler::Metagrammar#_nt_parsing_expression

Defined in:

lib/vendor/treetop/lib/treetop/compiler/metagrammar.rb

#_nt_parsing_expression ⇒ Object

# File 'lib/vendor/treetop/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