eg2.java

是Google提供的一个 Windows 应用程序；用户可以借助于该程序

/* Generated By:JJTree&JavaCC: Do not edit this line. eg2.java */
package cmm;

@SuppressWarnings("all")
public class eg2/*@bgen(jjtree)*/implements eg2TreeConstants, eg2Constants {/*@bgen(jjtree)*/
  protected static JJTeg2State jjtree = new JJTeg2State();public static void main(String args[]) {
    System.out.println("Reading from standard input...");
    System.out.print("Enter an expression like \"1+(2+3)*var;\" :");
    new eg2(System.in);
    try {
      SimpleNode n = eg2.Start();
      n.dump("");
      System.out.println("Thank you.");
    } catch (Exception e) {
      System.out.println("Oops.");
      System.out.println(e.getMessage());
    }
  }

  static final public SimpleNode Start() throws ParseException {
                    /*@bgen(jjtree) Start */
  SimpleNode jjtn000 = new SimpleNode(JJTSTART);
  boolean jjtc000 = true;
  jjtree.openNodeScope(jjtn000);
    try {
      Expression();
      jj_consume_token(14);
    jjtree.closeNodeScope(jjtn000, true);
    jjtc000 = false;
    {if (true) return jjtn000;}
    } catch (Throwable jjte000) {
    if (jjtc000) {
      jjtree.clearNodeScope(jjtn000);
      jjtc000 = false;
    } else {
      jjtree.popNode();
    }
    if (jjte000 instanceof RuntimeException) {
      {if (true) throw (RuntimeException)jjte000;}
    }
    if (jjte000 instanceof ParseException) {
      {if (true) throw (ParseException)jjte000;}
    }
    {if (true) throw (Error)jjte000;}
    } finally {
    if (jjtc000) {
      jjtree.closeNodeScope(jjtn000, true);
    }
    }
    throw new Error("Missing return statement in function");
  }

  static final public void Expression() throws ParseException {
                   /*@bgen(jjtree) Expression */
  SimpleNode jjtn000 = new SimpleNode(JJTEXPRESSION);
  boolean jjtc000 = true;
  jjtree.openNodeScope(jjtn000);
    try {
      AdditiveExpression();
    } catch (Throwable jjte000) {
    if (jjtc000) {
      jjtree.clearNodeScope(jjtn000);
      jjtc000 = false;
    } else {
      jjtree.popNode();
    }
    if (jjte000 instanceof RuntimeException) {
      {if (true) throw (RuntimeException)jjte000;}
    }
    if (jjte000 instanceof ParseException) {
      {if (true) throw (ParseException)jjte000;}
    }
    {if (true) throw (Error)jjte000;}
    } finally {
    if (jjtc000) {
      jjtree.closeNodeScope(jjtn000, true);
    }
    }
  }

  static final public void AdditiveExpression() throws ParseException {
                           /*@bgen(jjtree) AdditiveExpression */
  SimpleNode jjtn000 = new SimpleNode(JJTADDITIVEEXPRESSION);
  boolean jjtc000 = true;
  jjtree.openNodeScope(jjtn000);
    try {
      MultiplicativeExpression();
      label_1:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case 15:
        case 16:
          ;
          break;
        default:
          jj_la1[0] = jj_gen;
          break label_1;
        }
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case 15:
          jj_consume_token(15);
          break;
        case 16:
          jj_consume_token(16);
          break;
        default:
          jj_la1[1] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
        MultiplicativeExpression();
      }
    } catch (Throwable jjte000) {
    if (jjtc000) {
      jjtree.clearNodeScope(jjtn000);
      jjtc000 = false;
    } else {
      jjtree.popNode();
    }
    if (jjte000 instanceof RuntimeException) {
      {if (true) throw (RuntimeException)jjte000;}
    }
    if (jjte000 instanceof ParseException) {
      {if (true) throw (ParseException)jjte000;}
    }
    {if (true) throw (Error)jjte000;}
    } finally {
    if (jjtc000) {
      jjtree.closeNodeScope(jjtn000, true);
    }
    }
  }

  static final public void MultiplicativeExpression() throws ParseException {
                                 /*@bgen(jjtree) MultiplicativeExpression */
  SimpleNode jjtn000 = new SimpleNode(JJTMULTIPLICATIVEEXPRESSION);
  boolean jjtc000 = true;
  jjtree.openNodeScope(jjtn000);
    try {
      UnaryExpression();
      label_2:
      while (true) {
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case 17:
        case 18:
        case 19:
          ;
          break;
        default:
          jj_la1[2] = jj_gen;
          break label_2;
        }
        switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
        case 17:
          jj_consume_token(17);
          break;
        case 18:
          jj_consume_token(18);
          break;
        case 19:
          jj_consume_token(19);
          break;
        default:
          jj_la1[3] = jj_gen;
          jj_consume_token(-1);
          throw new ParseException();
        }
        UnaryExpression();
      }
    } catch (Throwable jjte000) {
    if (jjtc000) {
      jjtree.clearNodeScope(jjtn000);
      jjtc000 = false;
    } else {
      jjtree.popNode();
    }
    if (jjte000 instanceof RuntimeException) {
      {if (true) throw (RuntimeException)jjte000;}
    }
    if (jjte000 instanceof ParseException) {
      {if (true) throw (ParseException)jjte000;}
    }
    {if (true) throw (Error)jjte000;}
    } finally {
    if (jjtc000) {
      jjtree.closeNodeScope(jjtn000, true);
    }
    }
  }

  static final public void UnaryExpression() throws ParseException {
                        /*@bgen(jjtree) UnaryExpression */
  SimpleNode jjtn000 = new SimpleNode(JJTUNARYEXPRESSION);
  boolean jjtc000 = true;
  jjtree.openNodeScope(jjtn000);
    try {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case 20:
        jj_consume_token(20);
        Expression();
        jj_consume_token(21);
        break;
      case IDENTIFIER:
        Identifier();
        break;
      case INTEGER_LITERAL:
        Integer();
        break;
      default:
        jj_la1[4] = jj_gen;
        jj_consume_token(-1);
        throw new ParseException();
      }
    } catch (Throwable jjte000) {
    if (jjtc000) {
      jjtree.clearNodeScope(jjtn000);
      jjtc000 = false;
    } else {
      jjtree.popNode();
    }
    if (jjte000 instanceof RuntimeException) {
      {if (true) throw (RuntimeException)jjte000;}
    }
    if (jjte000 instanceof ParseException) {
      {if (true) throw (ParseException)jjte000;}
    }
    {if (true) throw (Error)jjte000;}
    } finally {
    if (jjtc000) {
      jjtree.closeNodeScope(jjtn000, true);
    }
    }
  }

  static final public void Identifier() throws ParseException {
                   /*@bgen(jjtree) Identifier */
  SimpleNode jjtn000 = new SimpleNode(JJTIDENTIFIER);
  boolean jjtc000 = true;
  jjtree.openNodeScope(jjtn000);
    try {
      jj_consume_token(IDENTIFIER);
    } finally {
    if (jjtc000) {
      jjtree.closeNodeScope(jjtn000, true);
    }
    }
  }

  static final public void Integer() throws ParseException {
                /*@bgen(jjtree) Integer */
  SimpleNode jjtn000 = new SimpleNode(JJTINTEGER);
  boolean jjtc000 = true;
  jjtree.openNodeScope(jjtn000);
    try {
      jj_consume_token(INTEGER_LITERAL);
    } finally {
    if (jjtc000) {
      jjtree.closeNodeScope(jjtn000, true);
    }
    }
  }

  static private boolean jj_initialized_once = false;
  /** Generated Token Manager. */
  static public eg2TokenManager token_source;
  static SimpleCharStream jj_input_stream;
  /** Current token. */
  static public Token token;
  /** Next token. */
  static public Token jj_nt;
  static private int jj_ntk;
  static private int jj_gen;
  static final private int[] jj_la1 = new int[5];
  static private int[] jj_la1_0;
  static {
      jj_la1_init_0();
   }
   private static void jj_la1_init_0() {
      jj_la1_0 = new int[] {0x18000,0x18000,0xe0000,0xe0000,0x100880,};
   }

  /** Constructor with InputStream. */
  public eg2(java.io.InputStream stream) {
     this(stream, null);
  }
  /** Constructor with InputStream and supplied encoding */
  public eg2(java.io.InputStream stream, String encoding) {
    if (jj_initialized_once) {
      System.out.println("ERROR: Second call to constructor of static parser.  ");
      System.out.println("       You must either use ReInit() or set the JavaCC option STATIC to false");
      System.out.println("       during parser generation.");
      throw new Error();
    }
    jj_initialized_once = true;
    try { jj_input_stream = new SimpleCharStream(stream, encoding, 1, 1); } catch(java.io.UnsupportedEncodingException e) { throw new RuntimeException(e); }
    token_source = new eg2TokenManager(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 5; i++) jj_la1[i] = -1;
  }

  /** Reinitialise. */
  static public void ReInit(java.io.InputStream stream) {
     ReInit(stream, null);
  }
  /** Reinitialise. */
  static public void ReInit(java.io.InputStream stream, String encoding) {
    try { jj_input_stream.ReInit(stream, encoding, 1, 1); } catch(java.io.UnsupportedEncodingException e) { throw new RuntimeException(e); }
    token_source.ReInit(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jjtree.reset();
    jj_gen = 0;
    for (int i = 0; i < 5; i++) jj_la1[i] = -1;
  }

  /** Constructor. */
  public eg2(java.io.Reader stream) {
    if (jj_initialized_once) {
      System.out.println("ERROR: Second call to constructor of static parser. ");
      System.out.println("       You must 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 SimpleCharStream(stream, 1, 1);
    token_source = new eg2TokenManager(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jj_gen = 0;
    for (int i = 0; i < 5; i++) jj_la1[i] = -1;
  }

  /** Reinitialise. */
  static public void ReInit(java.io.Reader stream) {
    jj_input_stream.ReInit(stream, 1, 1);
    token_source.ReInit(jj_input_stream);
    token = new Token();
    jj_ntk = -1;
    jjtree.reset();
    jj_gen = 0;
    for (int i = 0; i < 5; i++) jj_la1[i] = -1;
  }

  /** Constructor with generated Token Manager. */
  public eg2(eg2TokenManager tm) {
    if (jj_initialized_once) {
      System.out.println("ERROR: Second call to constructor of static parser. ");
      System.out.println("       You must 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 < 5; i++) jj_la1[i] = -1;
  }

  /** Reinitialise. */
  public void ReInit(eg2TokenManager tm) {
    token_source = tm;
    token = new Token();
    jj_ntk = -1;
    jjtree.reset();
    jj_gen = 0;
    for (int i = 0; i < 5; i++) jj_la1[i] = -1;
  }

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


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

/** Get the specific 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 = token_source.getNextToken();
    }
    return t;
  }

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

  static private java.util.List<int[]> jj_expentries = new java.util.ArrayList<int[]>();
  static private int[] jj_expentry;
  static private int jj_kind = -1;

  /** Generate ParseException. */
  static public ParseException generateParseException() {
    jj_expentries.clear();
    boolean[] la1tokens = new boolean[22];
    if (jj_kind >= 0) {
      la1tokens[jj_kind] = true;
      jj_kind = -1;
    }
    for (int i = 0; i < 5; 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;
          }
        }
      }
    }
    for (int i = 0; i < 22; i++) {
      if (la1tokens[i]) {
        jj_expentry = new int[1];
        jj_expentry[0] = i;
        jj_expentries.add(jj_expentry);
      }
    }
    int[][] exptokseq = new int[jj_expentries.size()][];
    for (int i = 0; i < jj_expentries.size(); i++) {
      exptokseq[i] = jj_expentries.get(i);
    }
    return new ParseException(token, exptokseq, tokenImage);
  }

  /** Enable tracing. */
  static final public void enable_tracing() {
  }

  /** Disable tracing. */
  static final public void disable_tracing() {
  }

}