expressionparser.java

用applet实现很多应用小程序

    case DOUBLE:
    case FLOAT:
    case STRING:
      e = Literal();
                  {if (true) return e;}
      break;
    case IF:
      e = IfStatement();
                      {if (true) return e;}
      break;
    case QUOTED:
    case IDENTIFIER:
      e = Identifier();
                     {if (true) return e;}
      break;
    case LPAREN:
      jj_consume_token(LPAREN);
      e = Expression();
      jj_consume_token(RPAREN);
                                       {if (true) return e;}
      break;
    default:
      jj_la1[14] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
    throw new Error("Missing return statement in function");
  }

  static final public Expression Literal() throws ParseException {
  Token t;
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case INT:
      t = jj_consume_token(INT);
              {if (true) return new NumericLiteral(Integer.parseInt(t.image));}
      break;
    case LONG:
      t = jj_consume_token(LONG);
               {if (true) return new NumericLiteral(Long.parseLong(t.image.substring(0,t.image.length()-1)));}
      break;
    case FLOAT:
      t = jj_consume_token(FLOAT);
                {if (true) return new NumericLiteral(Float.parseFloat(t.image));}
      break;
    case DOUBLE:
      t = jj_consume_token(DOUBLE);
                 {if (true) return new NumericLiteral(Double.parseDouble(t.image));}
      break;
    case STRING:
      t = jj_consume_token(STRING);
                String s = unescape(t.image.substring(1, t.image.length()-1));
                {if (true) return new ObjectLiteral(s);}
      break;
    case TRUE:
      jj_consume_token(TRUE);
             {if (true) return new BooleanLiteral(true);}
      break;
    case FALSE:
      jj_consume_token(FALSE);
              {if (true) return new BooleanLiteral(false);}
      break;
    case NULL:
      jj_consume_token(NULL);
             {if (true) return new ObjectLiteral(null);}
      break;
    default:
      jj_la1[15] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
    throw new Error("Missing return statement in function");
  }

  static final public Expression Identifier() throws ParseException {
  String s; Function f=null; Expression e;
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case QUOTED:
      s = Quoted();
                 {if (true) return new ColumnExpression(s);}
      break;
    case IDENTIFIER:
      s = Name();
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case LPAREN:
        jj_consume_token(LPAREN);
                 f = FunctionTable.createFunction(s);
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case TRUE:
        case FALSE:
        case NULL:
        case IF:
        case NOT:
        case INT:
        case LONG:
        case DOUBLE:
        case FLOAT:
        case STRING:
        case QUOTED:
        case IDENTIFIER:
        case LPAREN:
        case ADD:
        case SUB:
          e = Expression();
                         f.addParameter(e);
          label_8:
          while (true) {
            switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
            case 43:
              ;
              break;
            default:
              jj_la1[16] = jj_gen;
              break label_8;
            }
            jj_consume_token(43);
            e = Expression();
                              f.addParameter(e);
          }
          break;
        default:
          jj_la1[17] = jj_gen;
          ;
        }
        jj_consume_token(RPAREN);
        break;
      default:
        jj_la1[18] = jj_gen;
        ;
      }
      {if (true) return f==null ? new ColumnExpression(s) : (Expression)f;}
      break;
    default:
      jj_la1[19] = jj_gen;
      jj_consume_token(-1);
      throw new ParseException();
    }
    throw new Error("Missing return statement in function");
  }

  static final public Expression IfStatement() throws ParseException {
  Expression p, t, e;
    jj_consume_token(IF);
    p = Expression();
    jj_consume_token(THEN);
    t = Expression();
    jj_consume_token(ELSE);
    e = Expression();
      if ( !(p instanceof Predicate) )
          {if (true) throw new ParseException("IF-statement test must be a predicate");}
      {if (true) return new IfExpression((Predicate)p, t, e);}
    throw new Error("Missing return statement in function");
  }

  static private boolean jj_initialized_once = false;
  static public ExpressionParserTokenManager token_source;
  static JavaCharStream jj_input_stream;
  static public Token token, jj_nt;
  static private int jj_ntk;
  static private int jj_gen;
  static final private int[] jj_la1 = new int[20];
  static private int[] jj_la1_0;
  static private int[] jj_la1_1;
  static {
      jj_la1_0();
      jj_la1_1();
   }
   private static void jj_la1_0() {
      jj_la1_0 = new int[] {0x277143c1,0x2000,0x8000,0x1000,0x80000000,0x80000000,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x277143c0,0x277103c0,0x17101c0,0x0,0x277143c0,0x20000000,0x6000000,};
   }
   private static void jj_la1_1() {
      jj_la1_1 = new int[] {0x60,0x0,0x0,0x0,0x10,0x10,0xf,0xf,0x460,0x460,0x380,0x380,0x60,0x60,0x0,0x0,0x800,0x60,0x0,0x0,};
   }

  public ExpressionParser(java.io.InputStream stream) {
    if (jj_initialized_once) {
      System.out.println("ERROR: Second call to constructor of static parser.  You must");
      System.out.println("       either use ReInit() or set the JavaCC option STATIC to false");
      System.out.println("       during parser generation.");
      throw new Error();
    }
    jj_initialized_once = true;
    jj_input_stream = new JavaCharStream(stream, 1, 1);
    token_source = new ExpressionParserTokenManager(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 20; i++) jj_la1[i] = -1;
  }

  static public void ReInit(java.io.InputStream stream) {
    jj_input_stream.ReInit(stream, 1, 1);
    ExpressionParserTokenManager.ReInit(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 20; i++) jj_la1[i] = -1;
  }

  public ExpressionParser(java.io.Reader stream) {
    if (jj_initialized_once) {
      System.out.println("ERROR: Second call to constructor of static parser.  You must");
      System.out.println("       either use ReInit() or set the JavaCC option STATIC to false");
      System.out.println("       during parser generation.");
      throw new Error();
    }
    jj_initialized_once = true;
    jj_input_stream = new JavaCharStream(stream, 1, 1);
    token_source = new ExpressionParserTokenManager(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 20; i++) jj_la1[i] = -1;
  }

  static public void ReInit(java.io.Reader stream) {
    jj_input_stream.ReInit(stream, 1, 1);
    ExpressionParserTokenManager.ReInit(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 20; i++) jj_la1[i] = -1;
  }

  public ExpressionParser(ExpressionParserTokenManager tm) {
    if (jj_initialized_once) {
      System.out.println("ERROR: Second call to constructor of static parser.  You must");
      System.out.println("       either use ReInit() or set the JavaCC option STATIC to false");
      System.out.println("       during parser generation.");
      throw new Error();
    }
    jj_initialized_once = true;
    token_source = tm;
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 20; i++) jj_la1[i] = -1;
  }

  public void ReInit(ExpressionParserTokenManager tm) {
    token_source = tm;
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 20; i++) jj_la1[i] = -1;
  }

  static final private Token jj_consume_token(int kind) throws ParseException {
    Token oldToken;
    if ((oldToken = token).next != null) token = token.next;
    else token = token.next = ExpressionParserTokenManager.getNextToken();
    jj_ntk = -1;
    if (token.kind == kind) {
      jj_gen++;
      return token;
    }
    token = oldToken;
    jj_kind = kind;
    throw generateParseException();
  }

  static final public Token getNextToken() {
    if (token.next != null) token = token.next;
    else token = token.next = ExpressionParserTokenManager.getNextToken();
    jj_ntk = -1;
    jj_gen++;
    return token;
  }

  static final public Token getToken(int index) {
    Token t = token;
    for (int i = 0; i < index; i++) {
      if (t.next != null) t = t.next;
      else t = t.next = ExpressionParserTokenManager.getNextToken();
    }
    return t;
  }

  static final private int jj_ntk() {
    if ((jj_nt=token.next) == null)
      return (jj_ntk = (token.next=ExpressionParserTokenManager.getNextToken()).kind);
    else
      return (jj_ntk = jj_nt.kind);
  }

  static private java.util.Vector jj_expentries = new java.util.Vector();
  static private int[] jj_expentry;
  static private int jj_kind = -1;

  static public ParseException generateParseException() {
    jj_expentries.removeAllElements();
    boolean[] la1tokens = new boolean[44];
    for (int i = 0; i < 44; i++) {
      la1tokens[i] = false;
    }
    if (jj_kind >= 0) {
      la1tokens[jj_kind] = true;
      jj_kind = -1;
    }
    for (int i = 0; i < 20; i++) {
      if (jj_la1[i] == jj_gen) {
        for (int j = 0; j < 32; j++) {
          if ((jj_la1_0[i] & (1<<j)) != 0) {
            la1tokens[j] = true;
          }
          if ((jj_la1_1[i] & (1<<j)) != 0) {
            la1tokens[32+j] = true;
          }
        }
      }
    }
    for (int i = 0; i < 44; i++) {
      if (la1tokens[i]) {
        jj_expentry = new int[1];
        jj_expentry[0] = i;
        jj_expentries.addElement(jj_expentry);
      }
    }
    int[][] exptokseq = new int[jj_expentries.size()][];
    for (int i = 0; i < jj_expentries.size(); i++) {
      exptokseq[i] = (int[])jj_expentries.elementAt(i);
    }
    return new ParseException(token, exptokseq, tokenImage);
  }

  static final public void enable_tracing() {
  }

  static final public void disable_tracing() {
  }

}