parser.java

来自「JAVA的一些源码 JAVA2 STANDARD EDITION DEVELO」· Java 代码 · 共 1,233 行 · 第 1/5 页

	          /* build a special start production */
	          new_rhs();
	          add_rhs_part(add_lab(new symbol_part(start_nt),"start_val"));
	          add_rhs_part(new symbol_part(terminal.EOF));
		  add_rhs_part(new action_part("RESULT = start_val;"));
	          emit.start_production = 
		     new production(non_terminal.START_nt, rhs_parts, rhs_pos);

	          new_rhs();
		}
	    }
	  
	  /* reset the rhs accumulation in any case */
	  new_rhs();
	
              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(28/*rhs*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 65: // rhs ::= prod_part_list PERCENT_PREC term_id 
            {
              Object RESULT = null;
		int term_nameleft = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int term_nameright = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		String term_name = (String)((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
		
	  com.sun.java_cup.internal.symbol sym = null;
	  if (lhs_nt != null) 
	    {
	      /* Find the precedence symbol */
	      if (term_name == null) {
		System.err.println("No terminal for contextual precedence");
		sym = null;
	      } else {
		sym = ((symbol_part)symbols.get(term_name)).the_symbol();
	      }
	      /* build the production */
	      production p;
	      if ((sym!=null) && (sym instanceof terminal)) {
		p = new production(lhs_nt, rhs_parts, rhs_pos,
				   ((terminal)sym).precedence_num(),
				   ((terminal)sym).precedence_side());
		((symbol_part)symbols.get(term_name)).the_symbol().note_use();
	      } else {
		System.err.println("Invalid terminal " + term_name + 
				   " for contextual precedence assignment");
		p = new production(lhs_nt, rhs_parts, rhs_pos);
	      }

	      /* if we have no start non-terminal declared and this is 
		 the first production, make its lhs nt the start_nt 
		 and build a special start production for it. */
              if (start_nt == null)
		{
		  start_nt = lhs_nt;

	          /* build a special start production */
	          new_rhs();
	          add_rhs_part(add_lab(new symbol_part(start_nt),"start_val"));
	          add_rhs_part(new symbol_part(terminal.EOF));
		  add_rhs_part(new action_part("RESULT = start_val;"));
		  if ((sym!=null) && (sym instanceof terminal)) {
		    emit.start_production = 
		      new production(non_terminal.START_nt, rhs_parts, 
				     rhs_pos, ((terminal)sym).precedence_num(),
				     ((terminal)sym).precedence_side());
		  } else {
		    emit.start_production = 
		      new production(non_terminal.START_nt, rhs_parts, rhs_pos);
		  }
	          new_rhs();
		}
	    }

	  /* reset the rhs accumulation in any case */
	  new_rhs();
	
              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(28/*rhs*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 64: // rhs_list ::= rhs 
            {
              Object RESULT = null;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(27/*rhs_list*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 63: // rhs_list ::= rhs_list BAR rhs 
            {
              Object RESULT = null;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(27/*rhs_list*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 62: // production ::= error NT$13 SEMI 
            {
              Object RESULT = null;
              // propagate RESULT from NT$13
              if ( ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value != null )
                RESULT = (Object) ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(22/*production*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 61: // NT$13 ::= 
            {
              Object RESULT = null;
 lexer.emit_error("Syntax Error"); 
              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(56/*NT$13*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 60: // production ::= nt_id NT$11 COLON_COLON_EQUALS NT$12 rhs_list SEMI 
            {
              Object RESULT = null;
              // propagate RESULT from NT$11
              if ( ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-4)).value != null )
                RESULT = (Object) ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-4)).value;
              // propagate RESULT from NT$12
              if ( ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value != null )
                RESULT = (Object) ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
		int lhs_idleft = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-5)).left;
		int lhs_idright = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-5)).right;
		String lhs_id = (String)((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-5)).value;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(22/*production*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-5)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 59: // NT$12 ::= 
            {
              Object RESULT = null;
		int lhs_idleft = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int lhs_idright = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		String lhs_id = (String)((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;
 
              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(55/*NT$12*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 58: // NT$11 ::= 
            {
              Object RESULT = null;
		int lhs_idleft = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int lhs_idright = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		String lhs_id = (String)((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;

	  /* lookup the lhs nt */
	  lhs_nt = (non_terminal)non_terms.get(lhs_id);

          /* if it wasn't declared, emit a message */
	  if (lhs_nt == null)
	    {
	      if (lexer.error_count == 0)
	        lexer.emit_error("LHS non terminal \"" + lhs_id + 
			       "\" has not been declared");
	    }

	  /* reset the rhs accumulation */
	  new_rhs();
	
              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(54/*NT$11*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 57: // production_list ::= production 
            {
              Object RESULT = null;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(12/*production_list*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 56: // production_list ::= production_list production 
            {
              Object RESULT = null;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(12/*production_list*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-1)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 55: // start_spec ::= empty 
            {
              Object RESULT = null;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(11/*start_spec*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 54: // start_spec ::= START WITH nt_id NT$10 SEMI 
            {
              Object RESULT = null;
              // propagate RESULT from NT$10
              if ( ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value != null )
                RESULT = (Object) ((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-1)).value;
		int start_nameleft = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).left;
		int start_nameright = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-2)).right;
		String start_name = (String)((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-2)).value;

              CUP$parser$result = new com.sun.java_cup.internal.runtime.Symbol(11/*start_spec*/, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-4)).left, ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right, RESULT);
            }
          return CUP$parser$result;

          /*. . . . . . . . . . . . . . . . . . . .*/
          case 53: // NT$10 ::= 
            {
              Object RESULT = null;
		int start_nameleft = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).left;
		int start_nameright = ((com.sun.java_cup.internal.runtime.Symbol)CUP$parser$stack.elementAt(CUP$parser$top-0)).right;
		String start_name = (String)((com.sun.java_cup.internal.runtime.Symbol) CUP$parser$stack.elementAt(CUP$parser$top-0)).value;
 
	  /* verify that the name has been declared as a non terminal */
	  non_terminal nt = (non_terminal)non_terms.get(start_name);
	  if (nt == null)
	    {
	      lexer.emit_error( "Start non terminal \"" + start_name + 
	  		         "\" has not been declared");
	    }
          else
	    {
	      /* remember the non-terminal for later */
	      start_nt = nt;

	      /* build a special start production */
	      new_rhs();
	      add_rhs_part(add_lab(new symbol_part(start_nt), "start_val"));
	      add_rhs_part(new symbol_part(terminal.EOF));
	      add_r