Class: Racc::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/opal/racc/parser.rb

Instance Method Summary collapse

Instance Method Details

#_racc_do_parse_rb(arg, in_debug) ⇒ Object 



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# File 'lib/opal/racc/parser.rb', line 27

def _racc_do_parse_rb(arg, in_debug)
  action_table   = arg[0]
  action_check   = arg[1]
  action_default = arg[2]
  action_pointer = arg[3]

  goto_table     = arg[4]
  goto_check     = arg[5]
  goto_default   = arg[6]
  goto_pointer   = arg[7]

  nt_base        = arg[8]
  reduce_table   = arg[9]
  token_table    = arg[10]
  shift_n        = arg[11]
  reduce_n       = arg[12]

  use_result     = arg[13]

  # racc sys vars
  racc_state     = [0]
  racc_tstack    = []
  racc_vstack    = []

  racc_t         = nil
  racc_tok       = nil
  racc_val       = nil
  racc_read_next = true

  racc_user_yyerror = false
  racc_error_status = 0

  token = nil; act = nil; i = nil; nerr = nil; custate = nil

  while true
    i = action_pointer[racc_state[-1]]

    if i
      if racc_read_next
        if racc_t != 0 # not EOF
          token = next_token

          racc_tok = token[0]
          racc_val = token[1]

          if racc_tok == false # EOF
            racc_t = 0
          else
            racc_t = token_table[racc_tok]
            racc_t = 1 unless racc_t
            # racc_t ||= 1
          end

          racc_read_next = false
        end
      end

      i += racc_t

      if (i < 0) || (act = action_table[i]).nil? || (action_check[i] != racc_state[-1])
        act = action_default[racc_state[-1]]
      end

    else
      act = action_default[racc_state[-1]]
    end

    if act > 0 && act < shift_n
      if racc_error_status > 0
        if racc_t != 1
          racc_error_status -= 1
        end
      end

      racc_vstack.push racc_val
      curstate = act
      racc_state << act
      racc_read_next = true

    elsif act < 0 && act > -reduce_n
      reduce_i   = act * -3
      reduce_len = reduce_table[reduce_i]
      reduce_to  = reduce_table[reduce_i + 1]
      method_id  = reduce_table[reduce_i + 2]

      tmp_v = racc_vstack.last reduce_len

      racc_state.pop reduce_len
      racc_vstack.pop reduce_len
      racc_tstack.pop reduce_len

      if use_result
        reduce_call_result = self.__send__ method_id, tmp_v, nil, tmp_v[0]
        racc_vstack.push reduce_call_result
      else
        raise "not using result??"
      end

      racc_tstack.push reduce_to

      k1 = reduce_to - nt_base

      if (reduce_i = goto_pointer[k1]) != nil
        reduce_i += racc_state[-1]

        if (reduce_i >= 0) && ((curstate = goto_table[reduce_i]) != nil) && (goto_check[reduce_i] == k1)
          racc_state.push curstate
        else
          racc_state.push goto_default[k1]
        end

      else
        racc_state.push goto_default[k1]
      end

    elsif act == shift_n
      # action
      return racc_vstack[0]

    elsif act == -reduce_n
      # reduce
      raise "Opal Syntax Error: unexpected '#{racc_tok.inspect}'"

    else
      raise "Rac: unknown action: #{act}"
    end

    # raise "and finished loop"
  end
end

#_racc_setup ⇒ Object 



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# File 'lib/opal/racc/parser.rb', line 19

def _racc_setup
  self.class::Racc_arg
end

#do_parse ⇒ Object 



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# File 'lib/opal/racc/parser.rb', line 23

def do_parse
  _racc_do_parse_rb _racc_setup, false
end