Taschenrechner

Main.java

@@ -0,0 +1,20 @@
+import java.io.FileNotFoundException;
+
+public class Main {
+public static void main (String [] args) {
+TschenrechnerScanner scanner;
+try {
+    scanner = new TschenrechnerScanner
+    (new java.io.FileReader("test"));
+} catch (FileNotFoundException e) {
+    scanner = new TschenrechnerScanner(new java.io.StringReader("digga"));
+}
+TschenrechnerParser parser = new TschenrechnerParser() ;
+try {
+parser.yyparse(scanner);
+}
+catch (Exception e) {
+e.printStackTrace();
+}
+}
+}

Makefile

@@ -0,0 +1,15 @@
+JAVAC = javac
+JAOOY = jaooy
+
+Main.class: Main.java yyTokenclass.class TschenrechnerScanner.class
+	$(JAVAC) Main.java
+yyTokenclass.class: TschenrechnerParser.java
+	$(JAVAC) TschenrechnerParser.java
+TschenrechnerScanner.class: TaschenrechnerLexer.java
+	$(JAVAC) TaschenrechnerLexer.java
+TaschenrechnerLexer.java: TaschenrechnerLexer
+	java -cp JLex2.jar JLex2.Main TaschenrechnerLexer
+TschenrechnerParser.java: TschenrechnerParser.jay skeleton.jaooy
+	$(JAOOY) -v TschenrechnerParser.jay < skeleton.jaooy > TschenrechnerParser.java
+clean:
+	rm -f *.class TaschenrechnerLexer.java TschenrechnerParser.java

TaschenrechnerLexer

@@ -0,0 +1,25 @@
+%%
+%jayscanner TschenrechnerScanner
+%jayparser TschenrechnerParser
+
+%class TaschenrechnerLexer
+%eofval{
+  System.out.println("ENd of file: gut gemacht");
+  return new EOF();
+%eofval}
+
+ws = [ \t\r\n\b\015]+
+%%
+
+"+" { return new PLUS(); }
+"*" { return new MAL(); }
+"-" { return new MINUS(); }
+"/" { return new GETEILT(); }
+"(" { return new KLAMMERAUF(); }
+")" { return new KLAMMERZU(); }
+[+|-]?[0-9][0-9]*("."[0-9]+)? { return new ZAHL();}
+[+|-]?[0-9][0-9]*("."[0-9]+)?"(" {return new KLAMMERAUF();}
+{ws} { }
+. {System.out.print("Fehler");}
+
+

TaschenrechnerLexer.java

@@ -0,0 +1,348 @@
+
+
+class TaschenrechnerLexer {
+	private final int YY_BUFFER_SIZE = 512;
+	private final int YY_F = -1;
+	private final int YY_NO_STATE = -1;
+	private final int YY_NOT_ACCEPT = 0;
+	private final int YY_START = 1;
+	private final int YY_END = 2;
+	private final int YY_NO_ANCHOR = 4;
+	private final int YY_BOL = 128;
+	private final int YY_EOF = 129;
+	private java.io.BufferedReader yy_reader;
+	private int yy_buffer_index;
+	private int yy_buffer_read;
+	private int yy_buffer_start;
+	private int yy_buffer_end;
+	private char yy_buffer[];
+	private boolean yy_at_bol;
+	private int yy_lexical_state;
+
+	TaschenrechnerLexer (java.io.Reader reader) {
+		this ();
+		if (null == reader) {
+			throw (new Error("Error: Bad input stream initializer."));
+		}
+		yy_reader = new java.io.BufferedReader(reader);
+	}
+
+	TaschenrechnerLexer (java.io.InputStream instream) {
+		this ();
+		if (null == instream) {
+			throw (new Error("Error: Bad input stream initializer."));
+		}
+		yy_reader = new java.io.BufferedReader(new java.io.InputStreamReader(instream));
+	}
+
+	private TaschenrechnerLexer () {
+		yy_buffer = new char[YY_BUFFER_SIZE];
+		yy_buffer_read = 0;
+		yy_buffer_index = 0;
+		yy_buffer_start = 0;
+		yy_buffer_end = 0;
+		yy_at_bol = true;
+		yy_lexical_state = YYINITIAL;
+	}
+
+	private boolean yy_eof_done = false;
+	private final int YYINITIAL = 0;
+	private final int yy_state_dtrans[] = {
+		0
+	};
+	private void yybegin (int state) {
+		yy_lexical_state = state;
+	}
+	private int yy_advance ()
+		throws java.io.IOException {
+		int next_read;
+		int i;
+		int j;
+
+		if (yy_buffer_index < yy_buffer_read) {
+			return yy_buffer[yy_buffer_index++];
+		}
+
+		if (0 != yy_buffer_start) {
+			i = yy_buffer_start;
+			j = 0;
+			while (i < yy_buffer_read) {
+				yy_buffer[j] = yy_buffer[i];
+				++i;
+				++j;
+			}
+			yy_buffer_end = yy_buffer_end - yy_buffer_start;
+			yy_buffer_start = 0;
+			yy_buffer_read = j;
+			yy_buffer_index = j;
+			next_read = yy_reader.read(yy_buffer,
+					yy_buffer_read,
+					yy_buffer.length - yy_buffer_read);
+			if (-1 == next_read) {
+				return YY_EOF;
+			}
+			yy_buffer_read = yy_buffer_read + next_read;
+		}
+
+		while (yy_buffer_index >= yy_buffer_read) {
+			if (yy_buffer_index >= yy_buffer.length) {
+				yy_buffer = yy_double(yy_buffer);
+			}
+			next_read = yy_reader.read(yy_buffer,
+					yy_buffer_read,
+					yy_buffer.length - yy_buffer_read);
+			if (-1 == next_read) {
+				return YY_EOF;
+			}
+			yy_buffer_read = yy_buffer_read + next_read;
+		}
+		return yy_buffer[yy_buffer_index++];
+	}
+	private void yy_move_end () {
+		if (yy_buffer_end > yy_buffer_start &&
+		    '\n' == yy_buffer[yy_buffer_end-1])
+			yy_buffer_end--;
+		if (yy_buffer_end > yy_buffer_start &&
+		    '\r' == yy_buffer[yy_buffer_end-1])
+			yy_buffer_end--;
+	}
+	private boolean yy_last_was_cr=false;
+	private void yy_mark_start () {
+		yy_buffer_start = yy_buffer_index;
+	}
+	private void yy_mark_end () {
+		yy_buffer_end = yy_buffer_index;
+	}
+	private void yy_to_mark () {
+		yy_buffer_index = yy_buffer_end;
+		yy_at_bol = (yy_buffer_end > yy_buffer_start) &&
+		            ('\r' == yy_buffer[yy_buffer_end-1] ||
+		             '\n' == yy_buffer[yy_buffer_end-1] ||
+		             2028/*LS*/ == yy_buffer[yy_buffer_end-1] ||
+		             2029/*PS*/ == yy_buffer[yy_buffer_end-1]);
+	}
+	private java.lang.String yytext () {
+		return (new java.lang.String(yy_buffer,
+			yy_buffer_start,
+			yy_buffer_end - yy_buffer_start));
+	}
+	private int yylength () {
+		return yy_buffer_end - yy_buffer_start;
+	}
+	private char[] yy_double (char buf[]) {
+		int i;
+		char newbuf[];
+		newbuf = new char[2*buf.length];
+		for (i = 0; i < buf.length; ++i) {
+			newbuf[i] = buf[i];
+		}
+		return newbuf;
+	}
+	private final int YY_E_INTERNAL = 0;
+	private final int YY_E_MATCH = 1;
+	private java.lang.String yy_error_string[] = {
+		"Error: Internal error.\n",
+		"Error: Unmatched input.\n"
+	};
+	private void yy_error (int code,boolean fatal) {
+		java.lang.System.out.print(yy_error_string[code]);
+		java.lang.System.out.flush();
+		if (fatal) {
+			throw new Error("Fatal Error.\n");
+		}
+	}
+	private int[][] unpackFromString(int size1, int size2, String st) {
+		int colonIndex = -1;
+		String lengthString;
+		int sequenceLength = 0;
+		int sequenceInteger = 0;
+
+		int commaIndex;
+		String workString;
+
+		int res[][] = new int[size1][size2];
+		for (int i= 0; i < size1; i++) {
+			for (int j= 0; j < size2; j++) {
+				if (sequenceLength != 0) {
+					res[i][j] = sequenceInteger;
+					sequenceLength--;
+					continue;
+				}
+				commaIndex = st.indexOf(',');
+				workString = (commaIndex==-1) ? st :
+					st.substring(0, commaIndex);
+				st = st.substring(commaIndex+1);
+				colonIndex = workString.indexOf(':');
+				if (colonIndex == -1) {
+					res[i][j]=Integer.parseInt(workString);
+					continue;
+				}
+				lengthString =
+					workString.substring(colonIndex+1);
+				sequenceLength=Integer.parseInt(lengthString);
+				workString=workString.substring(0,colonIndex);
+				sequenceInteger=Integer.parseInt(workString);
+				res[i][j] = sequenceInteger;
+				sequenceLength--;
+			}
+		}
+		return res;
+	}
+	private int yy_acpt[] = {
+		/* 0 */ YY_NOT_ACCEPT,
+		/* 1 */ YY_NO_ANCHOR,
+		/* 2 */ YY_NO_ANCHOR,
+		/* 3 */ YY_NO_ANCHOR,
+		/* 4 */ YY_NO_ANCHOR,
+		/* 5 */ YY_NO_ANCHOR,
+		/* 6 */ YY_NO_ANCHOR,
+		/* 7 */ YY_NO_ANCHOR,
+		/* 8 */ YY_NO_ANCHOR,
+		/* 9 */ YY_NO_ANCHOR,
+		/* 10 */ YY_NO_ANCHOR,
+		/* 11 */ YY_NO_ANCHOR,
+		/* 12 */ YY_NOT_ACCEPT,
+		/* 13 */ YY_NO_ANCHOR,
+		/* 14 */ YY_NO_ANCHOR
+	};
+	private int yy_cmap[] = unpackFromString(1,130,
+"11:8,10:3,11:2,10,11:18,10,11:7,5,6,2,1,11,3,9,4,8:10,11:66,7,11:3,0:2")[0];
+
+	private int yy_rmap[] = unpackFromString(1,15,
+"0,1,2,1,2,1:3,2,3,4,1,5,1,6")[0];
+
+	private int yy_nxt[][] = unpackFromString(7,12,
+"1,2,3,4,5,6,7,8,9,13,10,13,-1:20,9,-1:8,11,-1:2,9,12,-1:12,10,-1:9,14,-1:8," +
+"11,-1:2,14,-1:3");
+
+	public yyTokenclass yylex ()
+		throws java.io.IOException {
+		int yy_lookahead;
+		int yy_anchor = YY_NO_ANCHOR;
+		int yy_state = yy_state_dtrans[yy_lexical_state];
+		int yy_next_state = YY_NO_STATE;
+		int yy_last_accept_state = YY_NO_STATE;
+		boolean yy_initial = true;
+		int yy_this_accept;
+
+		yy_mark_start();
+		yy_this_accept = yy_acpt[yy_state];
+		if (YY_NOT_ACCEPT != yy_this_accept) {
+			yy_last_accept_state = yy_state;
+			yy_mark_end();
+		}
+		while (true) {
+			if (yy_initial && yy_at_bol) yy_lookahead = YY_BOL;
+			else yy_lookahead = yy_advance();
+			yy_next_state = YY_F;
+			yy_next_state = yy_nxt[yy_rmap[yy_state]][yy_cmap[yy_lookahead]];
+			if (YY_EOF == yy_lookahead && true == yy_initial) {
+
+  System.out.println("ENd of file: gut gemacht");
+  return new EOF();
+			}
+			if (YY_F != yy_next_state) {
+				yy_state = yy_next_state;
+				yy_initial = false;
+				yy_this_accept = yy_acpt[yy_state];
+				if (YY_NOT_ACCEPT != yy_this_accept) {
+					yy_last_accept_state = yy_state;
+					yy_mark_end();
+				}
+			}
+			else {
+				if (YY_NO_STATE == yy_last_accept_state) {
+					throw (new Error("Lexical Error: Unmatched Input."));
+				}
+				else {
+					yy_anchor = yy_acpt[yy_last_accept_state];
+					if (0 != (YY_END & yy_anchor)) {
+						yy_move_end();
+					}
+					yy_to_mark();
+					switch (yy_last_accept_state) {
+					case 1:
+						
+					case -2:
+						break;
+					case 2:
+						{ return new PLUS(); }
+					case -3:
+						break;
+					case 3:
+						{ return new MAL(); }
+					case -4:
+						break;
+					case 4:
+						{ return new MINUS(); }
+					case -5:
+						break;
+					case 5:
+						{ return new GETEILT(); }
+					case -6:
+						break;
+					case 6:
+						{ return new KLAMMERAUF(); }
+					case -7:
+						break;
+					case 7:
+						{ return new KLAMMERZU(); }
+					case -8:
+						break;
+					case 8:
+						{System.out.print("Fehler");}
+					case -9:
+						break;
+					case 9:
+						{ return new ZAHL();}
+					case -10:
+						break;
+					case 10:
+						{ }
+					case -11:
+						break;
+					case 11:
+						{return new KLAMMERAUF();}
+					case -12:
+						break;
+					case 13:
+						{System.out.print("Fehler");}
+					case -13:
+						break;
+					case 14:
+						{ return new ZAHL();}
+					case -14:
+						break;
+					default:
+						yy_error(YY_E_INTERNAL,false);
+					case -1:
+					}
+					yy_initial = true;
+					yy_state = yy_state_dtrans[yy_lexical_state];
+					yy_next_state = YY_NO_STATE;
+					yy_last_accept_state = YY_NO_STATE;
+					yy_mark_start();
+					yy_this_accept = yy_acpt[yy_state];
+					if (YY_NOT_ACCEPT != yy_this_accept) {
+						yy_last_accept_state = yy_state;
+						yy_mark_end();
+					}
+				}
+			}
+		}
+	}
+}
+class TschenrechnerScanner extends TaschenrechnerLexer implements TschenrechnerParser.yyInput {
+	public TschenrechnerScanner (java.io.Reader reader) {
+		super (reader);
+	}
+	//public int token() is not longer necessary
+
+	public yyTokenclass advance() throws java.io.IOException {
+		yyTokenclass ret = yylex();
+		return ret;
+	}
+
+	//public Object value () is not longer necessary
+
+}

TschenrechnerParser.java

@@ -0,0 +1,631 @@
+// created by jay 0.8 (c) 1998 Axel.Schreiner@informatik.uni-osnabrueck.de
+
+					// line 1 "TschenrechnerParser.jay"
+
+class TschenrechnerParser {
+					// line 7 "-"
+ yyError yytemperror = new yyError();
+ public final int yyErrorCode = yytemperror.tokennr; 
+
+  /** thrown for irrecoverable syntax errors and stack overflow.
+    */
+  public static class yyException extends java.lang.Exception {
+    public yyException (String message) {
+      super(message);
+    }
+  }
+
+  /** must be implemented by a scanner object to supply input to the parser.
+    */
+  public interface yyInput {
+    /** move on to next token.
+        @return false if positioned beyond tokens.
+        @throws IOException on input error.
+      */
+  /** modified by diho, 10.04.2004 */
+    yyTokenclass advance () throws java.io.IOException;
+    /** classifies current token.
+        Should not be called if advance() returned false.
+        @return current %token or single character.
+      */
+	/** modified by diho, 10.04.2004 token () is not longer necessary,
+		advance () supplies token or null
+    int token (); */
+
+	
+    /** associated with current token.
+        Should not be called if advance() returned false.
+        @return value for token().
+      */
+    /** modified by diho, 10.04.2004 value () is not longer necessary,
+		Token value can be retrieved from Token itself.
+    Object value ();*/
+  }
+
+  /** simplified error message.
+      @see <a href="#yyerror(java.lang.String, java.lang.String[])">yyerror</a>
+    */
+  public void yyerror (String message) {
+    yyerror(message, null);
+  }
+
+  /** (syntax) error message.
+      Can be overwritten to control message format.
+      @param message text to be displayed.
+      @param expected vector of acceptable tokens, if available.
+    */
+  public void yyerror (String message, String[] expected) {
+    if (expected != null && expected.length > 0) {
+      System.err.print(message+", expecting");
+      for (int n = 0; n < expected.length; ++ n)
+        System.err.print(" "+expected[n]);
+      System.err.println();
+    } else
+      System.err.println(message);
+  }
+
+  /** debugging support, requires the package jay.yydebug.
+      Set to null to suppress debugging messages.
+    */
+//t  protected jay.yydebug.yyDebug yydebug;
+
+  protected static final int yyFinal = 3;
+
+  /** index-checked interface to yyName[].
+      @param token single character or %token value.
+      @return token name or [illegal] or [unknown].
+    */
+//t  public static final String yyname (int token) {
+//t    if (token < 0 || token > YyNameClass.yyName.length) return "[illegal]";
+//t    String name;
+//t    if ((name = YyNameClass.yyName[token]) != null) return name;
+//t    return "[unknown]";
+//t  }
+
+  /** computes list of expected tokens on error by tracing the tables.
+      @param state for which to compute the list.
+      @return list of token names.
+    */
+  protected String[] yyExpecting (int state) {
+    int token, n, len = 0;
+    boolean[] ok = new boolean[YyNameClass.yyName.length];
+
+    if ((n = YySindexClass.yySindex[state]) != 0)
+      for (token = n < 0 ? -n : 0;
+           token < YyNameClass.yyName.length && n+token < YyTableClass.yyTable.length; ++ token)
+        if (YyCheckClass.yyCheck[n+token] == token && !ok[token] && YyNameClass.yyName[token] != null) {
+          ++ len;
+          ok[token] = true;
+        }
+    if ((n = YyRindexClass.yyRindex[state]) != 0)
+      for (token = n < 0 ? -n : 0;
+           token < YyNameClass.yyName.length && n+token < YyTableClass.yyTable.length; ++ token)
+        if (YyCheckClass.yyCheck[n+token] == token && !ok[token] && YyNameClass.yyName[token] != null) {
+          ++ len;
+          ok[token] = true;
+        }
+
+    String result[] = new String[len];
+    for (n = token = 0; n < len;  ++ token)
+      if (ok[token]) result[n++] = YyNameClass.yyName[token];
+    return result;
+  }
+
+  /** the generated parser, with debugging messages.
+      Maintains a state and a value stack, currently with fixed maximum size.
+      @param yyLex scanner.
+      @param yydebug debug message writer implementing yyDebug, or null.
+      @return result of the last reduction, if any.
+      @throws yyException on irrecoverable parse error.
+    */
+  public Object yyparse (yyInput yyLex, Object yydebug)
+				throws java.io.IOException, yyException {
+//t    this.yydebug = (jay.yydebug.yyDebug)yydebug;
+    return yyparse(yyLex);
+  }
+
+  /** initial size and increment of the state/value stack [default 256].
+      This is not final so that it can be overwritten outside of invocations
+      of yyparse().
+    */
+  protected int yyMax;
+
+  /** executed at the beginning of a reduce action.
+      Used as $$ = yyDefault($1), prior to the user-specified action, if any.
+      Can be overwritten to provide deep copy, etc.
+      @param first value for $1, or null.
+      @return first.
+    */
+  protected Object yyDefault (Object first) {
+    return first;
+  }
+
+  /** the generated parser.
+      Maintains a state and a value stack, currently with fixed maximum size.
+      @param yyLex scanner.
+      @return result of the last reduction, if any.
+      @throws yyException on irrecoverable parse error.
+    */
+  public Object yyparse (yyInput yyLex)
+				throws java.io.IOException, yyException {
+    YyCheckClass.yyCheckInit();                         // initial yyCheck eingefuegt PL 05-03-08
+    YyTableClass.yyTableInit();                         // initial yyCheck eingefuegt PL 05-03-08
+    if (yyMax <= 0) yyMax = 256;			// initial size
+    int yyState = 0, yyStates[] = new int[yyMax];	// state stack
+    Object yyVal = null, yyVals[] = new Object[yyMax];	// value stack
+    /*modified by diho, 14.04.2004
+      orig: int yyToken = -1 was replaced by "empty Token"*/
+    yyTokenclass yyToken = new yyTokenclass();		// current input
+    int yyErrorFlag = 0;				// #tks to shift
+
+    yyLoop: for (int yyTop = 0;; ++ yyTop) {
+      if (yyTop >= yyStates.length) {			// dynamically increase
+        int[] i = new int[yyStates.length+yyMax];
+        System.arraycopy(yyStates, 0, i, 0, yyStates.length);
+        yyStates = i;
+        Object[] o = new Object[yyVals.length+yyMax];
+        System.arraycopy(yyVals, 0, o, 0, yyVals.length);
+        yyVals = o;
+      }
+      yyStates[yyTop] = yyState;
+      yyVals[yyTop] = yyVal;
+//t      if (yydebug != null) yydebug.push(yyState, yyVal);
+
+      yyDiscarded: for (;;) {	// discarding a token does not change stack
+        int yyN;
+        if ((yyN = YyDefRedClass.yyDefRed[yyState]) == 0) {	// else [default] reduce (yyN)
+          /* modified by diho, 14.04.2004
+             if "empty token", get next token */
+          if (yyToken.tokennr <0) {
+          /* modified by diho, 10.04.2004 
+          call yyLex.advance in any case, check if yyToken is EOF */
+            yyToken = yyLex.advance(); /*? yyLex.token() : 0;*/
+           /* modified by diho, 27.04.2004
+             if "null", create EOF token */
+            if (yyToken == null) {yyToken = new EOF();}
+
+//t            if (yydebug != null)
+//t          /* modified by diho, 14.04.2004
+//t             orig.: yydebug.lex(yyState, yyToken, yyname(yyToken), yyLex.value()); */
+//t              yydebug.lex(yyState, yyToken.tokennr, yyname(yyToken.tokennr), yyToken.value);
+          }
+          /* modified by diho, 14.04.2004 
+             replaced yyToken by yyToken.tokennr*/
+          if ((yyN = YySindexClass.yySindex[yyState]) != 0 && (yyN += yyToken.tokennr) >= 0
+          /* modified by diho, 14.04.2004 
+             replaced yyToken by yyToken.tokennr*/
+              && yyN < YyTableClass.yyTable.length && YyCheckClass.yyCheck[yyN] == yyToken.tokennr) {
+//t            if (yydebug != null)
+//t              yydebug.shift(yyState, YyTableClass.yyTable[yyN], yyErrorFlag-1);
+            yyState = YyTableClass.yyTable[yyN];		// shift to yyN
+          /* modified by diho, 14.04.2004 
+             replaced yyLex.value() by yyToken.value*/
+            yyVal = yyToken.value;
+          /* modified by diho, 14.04.2004 
+             orig:  yyToken = -1 */
+            yyToken = new yyTokenclass();
+            if (yyErrorFlag > 0) -- yyErrorFlag;
+            continue yyLoop;
+          }
+          /* modified by diho, 14.04.2004 
+             replaced yyToken by yyToken.tokennr*/
+          if ((yyN = YyRindexClass.yyRindex[yyState]) != 0 && (yyN += yyToken.tokennr) >= 0
+          /* modified by diho, 14.04.2004 
+             replaced yyToken by yyToken.tokennr*/
+              && yyN < YyTableClass.yyTable.length && YyCheckClass.yyCheck[yyN] == yyToken.tokennr)
+            yyN = YyTableClass.yyTable[yyN];			// reduce (yyN)
+          else
+            switch (yyErrorFlag) {
+  
+            case 0:
+              yyerror("syntax error", yyExpecting(yyState));
+//t              if (yydebug != null) yydebug.error("syntax error");
+  
+            case 1: case 2:
+              yyErrorFlag = 3;
+              do {
+                if ((yyN = YySindexClass.yySindex[yyStates[yyTop]]) != 0
+                    && (yyN += yyErrorCode) >= 0 && yyN < YyTableClass.yyTable.length
+                    && YyCheckClass.yyCheck[yyN] == yyErrorCode) {
+//t                  if (yydebug != null)
+//t                    yydebug.shift(yyStates[yyTop], YyTableClass.yyTable[yyN], 3);
+                  yyState = YyTableClass.yyTable[yyN];
+          /* modified by diho, 14.04.2004 
+             replaced yyLex.value by yyToken.value*/
+                  yyVal = yyToken.value;
+                  continue yyLoop;
+                }
+//t                if (yydebug != null) yydebug.pop(yyStates[yyTop]);
+              } while (-- yyTop >= 0);
+//t              if (yydebug != null) yydebug.reject();
+              throw new yyException("irrecoverable syntax error");
+  
+            case 3:
+          /* modified by diho, 14.04.2004 
+             orig.: if (yyToken == 0)*/
+              if (yyToken == null) {
+//t                if (yydebug != null) yydebug.reject();
+                throw new yyException("irrecoverable syntax error at end-of-file");
+              }
+//t              if (yydebug != null)
+          /* modified by diho, 14.04.2004 
+             replaced yyToken by yyToken.tokennr, yyLex.value by yyToken.value*/
+//t                yydebug.discard(yyState, yyToken.tokennr, yyname(yyToken.tokennr),
+//t  							yyToken.value);
+          /* modified by diho, 14.04.2004 
+             orig: yyToken = -1*/
+              yyToken = new yyTokenclass();
+              continue yyDiscarded;		// leave stack alone
+            }
+        }
+        int yyV = yyTop + 1-YyLenClass.yyLen[yyN];
+//t        if (yydebug != null)
+//t          yydebug.reduce(yyState, yyStates[yyV-1], yyN, YyRuleClass.yyRule[yyN], YyLenClass.yyLen[yyN]);
+        yyVal = yyDefault(yyV > yyTop ? null : yyVals[yyV]);
+        switch (yyN) {
+case 1:
+					// line 15 "TschenrechnerParser.jay"
+  {}
+  break;
+case 2:
+					// line 16 "TschenrechnerParser.jay"
+  {}
+  break;
+case 3:
+					// line 17 "TschenrechnerParser.jay"
+  {}
+  break;
+case 4:
+					// line 19 "TschenrechnerParser.jay"
+  {}
+  break;
+case 5:
+					// line 20 "TschenrechnerParser.jay"
+  {}
+  break;
+case 6:
+					// line 21 "TschenrechnerParser.jay"
+  {}
+  break;
+case 7:
+					// line 22 "TschenrechnerParser.jay"
+  {}
+  break;
+					// line 295 "-"
+        }
+        yyTop -= YyLenClass.yyLen[yyN];
+        yyState = yyStates[yyTop];
+        int yyM = YyLhsClass.yyLhs[yyN];
+        if (yyState == 0 && yyM == 0) {
+//t          if (yydebug != null) yydebug.shift(0, yyFinal);
+          yyState = yyFinal;
+          /* modified by diho, 14.04.2004 
+             replaced yyToken by yyToken.tokennr*/
+          if (yyToken.tokennr < 0) {
+          /** modified by diho, 10.04.2004
+          */
+            yyToken = yyLex.advance(); /* ? yyLex.token() : 0;*/
+          /* modified by diho, 14.04.2004
+             if "empty token", get next token */
+            if (yyToken == null) {yyToken = new EOF();}
+//t            if (yydebug != null)
+          /* modified by diho, 14.04.2004 
+             replaced yyToken by yyToken.tokennr, yyLex.value() by yyToken.value*/
+//t               yydebug.lex(yyState, yyToken.tokennr,yyname(yyToken.tokennr), yyToken.value);
+          }
+          /* modified by diho, 14.04.2004 
+             orig.: if (yyToken == 0) */
+          if (yyToken.tokennr == 0) {
+//t            if (yydebug != null) yydebug.accept(yyVal);
+            return yyVal;
+          }
+          continue yyLoop;
+        }
+        if ((yyN = YyGindexClass.yyGindex[yyM]) != 0 && (yyN += yyState) >= 0
+            && yyN < YyTableClass.yyTable.length && YyCheckClass.yyCheck[yyN] == yyState)
+          yyState = YyTableClass.yyTable[yyN];
+        else
+          yyState = YyDgotoClass.yyDgoto[yyM];
+//t        if (yydebug != null) yydebug.shift(yyStates[yyTop], yyState);
+	 continue yyLoop;
+      }
+    }
+  }
+
+  protected static final class YyLhsClass {
+
+    public static final short yyLhs [] = {              -1,
+          0,    0,    0,    1,    1,    1,    1,
+    };
+  } /* End of class YyLhsClass */
+
+  protected static final class YyLenClass {
+
+    public static final short yyLen [] = {           2,
+          3,    3,    1,    1,    1,    1,    1,
+    };
+  } /* End class YyLenClass */
+
+  protected static final class YyDefRedClass {
+
+    public static final short yyDefRed [] = {            0,
+          0,    3,    0,    0,    4,    5,    6,    7,    0,    1,
+          0,
+    };
+  } /* End of class YyDefRedClass */
+
+  protected static final class YyDgotoClass {
+
+    public static final short yyDgoto [] = {             3,
+          9,
+    };
+  } /* End of class YyDgotoClass */
+
+  protected static final class YySindexClass {
+
+    public static final short yySindex [] = {         -247,
+       -247,    0, -248, -255,    0,    0,    0,    0, -247,    0,
+       -248,
+    };
+  } /* End of class YySindexClass */
+
+  protected static final class YyRindexClass {
+
+    public static final short yyRindex [] = {            0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          1,
+    };
+  } /* End of class YyRindexClass */
+
+  protected static final class YyGindexClass {
+
+    public static final short yyGindex [] = {           -1,
+          0,
+    };
+  } /* End of class YyGindexClass */
+
+protected static class yyTable0 {
+  protected static final short yyTable0 [] = {             4,
+          2,    5,    6,    7,    8,    0,   10,   11,    5,    6,
+          7,    8,    0,    1,    0,    2,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    0,    0,    0,    0,    0,    0,    0,    0,
+          0,    0,    2,
+  };
+}
+  protected static final class YyTableClass {
+
+  static short[] yyTable = new short[264];
+  protected static void yyTableInit () {
+     int numyycheck;
+     int yyTableerun = 0;
+     for (numyycheck = 0; numyycheck <= 1000; numyycheck++) {
+        if (yyTableerun < 264) {
+          yyTable[yyTableerun] = yyTable0.yyTable0[numyycheck];
+          yyTableerun++;
+        }
+     }
+}
+  } /* End of class YyTableClass */
+
+protected static class yyCheck0 {
+  protected static final short yyCheck0 [] = {             1,
+          0,  257,  258,  259,  260,   -1,  262,    9,  257,  258,
+        259,  260,   -1,  261,   -1,  263,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,
+         -1,   -1,  262,
+  };
+}
+  protected static final class YyCheckClass {
+
+  static short[] yyCheck = new short[264];
+  protected static void yyCheckInit () {
+     int numyycheck;
+     int yyCheckerun = 0;
+     for (numyycheck = 0; numyycheck <= 1000; numyycheck++) {
+        if (yyCheckerun < 264) {
+          yyCheck[yyCheckerun] = yyCheck0.yyCheck0[numyycheck];
+          yyCheckerun++;
+        }
+     }
+
+    };
+  } /* End of class YyCheckClass */
+
+
+//t  protected static final class YyRuleClass {
+
+//t    public static final String yyRule [] = {
+//t    "$accept : S",
+//t    "S : KLAMMERAUF S KLAMMERZU",
+//t    "S : S operationszeichen S",
+//t    "S : ZAHL",
+//t    "operationszeichen : PLUS",
+//t    "operationszeichen : MAL",
+//t    "operationszeichen : MINUS",
+//t    "operationszeichen : GETEILT",
+//t    };
+//t  } /* End of class YyRuleClass */
+
+  protected static final class YyNameClass {
+
+    public static final String yyName [] = {    
+    "end-of-file",null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,null,null,null,null,null,null,null,
+    null,null,null,null,null,null,null,"PLUS","MAL","MINUS","GETEILT",
+    "KLAMMERAUF","KLAMMERZU","ZAHL","MALKLAMMERAUF",
+    };
+  } /* End of class YyNameClass */
+
+
+					// line 23 "TschenrechnerParser.jay"
+
+      }
+      					// line 535 "-"
+class yyTokenclass {	
+   public int tokennr;	
+   public Object value;
+
+   yyTokenclass () {
+      this.tokennr=-1;
+   }
+   yyTokenclass (Object o) {
+      this.value = o;
+   }
+}
+class EOF extends yyTokenclass {	
+
+   EOF () {
+      super();
+      this.tokennr=0;
+   }
+}
+// %token constants
+
+  final class PLUS extends yyTokenclass {
+   PLUS(Object o) {
+      super(o);
+      this.tokennr = 257;
+   }
+   PLUS() {
+      super();
+      this.tokennr = 257;
+   }
+}
+  final class MAL extends yyTokenclass {
+   MAL(Object o) {
+      super(o);
+      this.tokennr = 258;
+   }
+   MAL() {
+      super();
+      this.tokennr = 258;
+   }
+}
+  final class MINUS extends yyTokenclass {
+   MINUS(Object o) {
+      super(o);
+      this.tokennr = 259;
+   }
+   MINUS() {
+      super();
+      this.tokennr = 259;
+   }
+}
+  final class GETEILT extends yyTokenclass {
+   GETEILT(Object o) {
+      super(o);
+      this.tokennr = 260;
+   }
+   GETEILT() {
+      super();
+      this.tokennr = 260;
+   }
+}
+  final class KLAMMERAUF extends yyTokenclass {
+   KLAMMERAUF(Object o) {
+      super(o);
+      this.tokennr = 261;
+   }
+   KLAMMERAUF() {
+      super();
+      this.tokennr = 261;
+   }
+}
+  final class KLAMMERZU extends yyTokenclass {
+   KLAMMERZU(Object o) {
+      super(o);
+      this.tokennr = 262;
+   }
+   KLAMMERZU() {
+      super();
+      this.tokennr = 262;
+   }
+}
+  final class ZAHL extends yyTokenclass {
+   ZAHL(Object o) {
+      super(o);
+      this.tokennr = 263;
+   }
+   ZAHL() {
+      super();
+      this.tokennr = 263;
+   }
+}
+  final class MALKLAMMERAUF extends yyTokenclass {
+   MALKLAMMERAUF(Object o) {
+      super(o);
+      this.tokennr = 264;
+   }
+   MALKLAMMERAUF() {
+      super();
+      this.tokennr = 264;
+   }
+}
+final class yyError extends yyTokenclass {
+   yyError () {
+      super();
+      this.tokennr = 256;
+   }
+}

TschenrechnerParser.jay

@@ -0,0 +1,24 @@
+%{
+class TschenrechnerParser {
+%}
+%token PLUS
+%token MAL
+%token MINUS
+%token GETEILT
+%token KLAMMERAUF
+%token KLAMMERZU
+%token ZAHL
+%token MALKLAMMERAUF
+
+
+%%
+S : KLAMMERAUF S KLAMMERZU  {}
+    | S operationszeichen S {}
+    | ZAHL {}
+operationszeichen : 
+    PLUS {}
+    | MAL{}
+    | MINUS{}
+    | GETEILT{} 
+%%
+}

skeleton.jaooy

@@ -0,0 +1,350 @@
+#	jay skeleton
+
+#	character in column 1 determines outcome...
+#		# is a comment
+#		. is copied
+#		t is copied as //t if -t is set
+#	other lines are interpreted to call jay procedures
+
+.// created by jay 0.8 (c) 1998 Axel.Schreiner@informatik.uni-osnabrueck.de
+.
+
+ prolog		## %{ ... %} prior to the first %%
+
+. yyError yytemperror = new yyError();
+. public final int yyErrorCode = yytemperror.tokennr; 
+.
+.  /** thrown for irrecoverable syntax errors and stack overflow.
+.    */
+.  public static class yyException extends java.lang.Exception {
+.    public yyException (String message) {
+.      super(message);
+.    }
+.  }
+.
+.  /** must be implemented by a scanner object to supply input to the parser.
+.    */
+.  public interface yyInput {
+.    /** move on to next token.
+.        @return false if positioned beyond tokens.
+.        @throws IOException on input error.
+.      */
+.  /** modified by diho, 10.04.2004 */
+.    yyTokenclass advance () throws java.io.IOException;
+.    /** classifies current token.
+.        Should not be called if advance() returned false.
+.        @return current %token or single character.
+.      */
+.	/** modified by diho, 10.04.2004 token () is not longer necessary,
+.		advance () supplies token or null
+.    int token (); */
+.
+.	
+.    /** associated with current token.
+.        Should not be called if advance() returned false.
+.        @return value for token().
+.      */
+.    /** modified by diho, 10.04.2004 value () is not longer necessary,
+.		Token value can be retrieved from Token itself.
+.    Object value ();*/
+.  }
+.
+.  /** simplified error message.
+.      @see <a href="#yyerror(java.lang.String, java.lang.String[])">yyerror</a>
+.    */
+.  public void yyerror (String message) {
+.    yyerror(message, null);
+.  }
+.
+.  /** (syntax) error message.
+.      Can be overwritten to control message format.
+.      @param message text to be displayed.
+.      @param expected vector of acceptable tokens, if available.
+.    */
+.  public void yyerror (String message, String[] expected) {
+.    if (expected != null && expected.length > 0) {
+.      System.err.print(message+", expecting");
+.      for (int n = 0; n < expected.length; ++ n)
+.        System.err.print(" "+expected[n]);
+.      System.err.println();
+.    } else
+.      System.err.println(message);
+.  }
+.
+.  /** debugging support, requires the package jay.yydebug.
+.      Set to null to suppress debugging messages.
+.    */
+t  protected jay.yydebug.yyDebug yydebug;
+.
+ final_rule             ## constant storing final rule
+.
+.  /** index-checked interface to yyName[].
+.      @param token single character or %token value.
+.      @return token name or [illegal] or [unknown].
+.    */
+t  public static final String yyname (int token) {
+t    if (token < 0 || token > YyNameClass.yyName.length) return "[illegal]";
+t    String name;
+t    if ((name = YyNameClass.yyName[token]) != null) return name;
+t    return "[unknown]";
+t  }
+.
+.  /** computes list of expected tokens on error by tracing the tables.
+.      @param state for which to compute the list.
+.      @return list of token names.
+.    */
+.  protected String[] yyExpecting (int state) {
+.    int token, n, len = 0;
+.    boolean[] ok = new boolean[YyNameClass.yyName.length];
+.
+.    if ((n = YySindexClass.yySindex[state]) != 0)
+.      for (token = n < 0 ? -n : 0;
+.           token < YyNameClass.yyName.length && n+token < YyTableClass.yyTable.length; ++ token)
+.        if (YyCheckClass.yyCheck[n+token] == token && !ok[token] && YyNameClass.yyName[token] != null) {
+.          ++ len;
+.          ok[token] = true;
+.        }
+.    if ((n = YyRindexClass.yyRindex[state]) != 0)
+.      for (token = n < 0 ? -n : 0;
+.           token < YyNameClass.yyName.length && n+token < YyTableClass.yyTable.length; ++ token)
+.        if (YyCheckClass.yyCheck[n+token] == token && !ok[token] && YyNameClass.yyName[token] != null) {
+.          ++ len;
+.          ok[token] = true;
+.        }
+.
+.    String result[] = new String[len];
+.    for (n = token = 0; n < len;  ++ token)
+.      if (ok[token]) result[n++] = YyNameClass.yyName[token];
+.    return result;
+.  }
+.
+.  /** the generated parser, with debugging messages.
+.      Maintains a state and a value stack, currently with fixed maximum size.
+.      @param yyLex scanner.
+.      @param yydebug debug message writer implementing yyDebug, or null.
+.      @return result of the last reduction, if any.
+.      @throws yyException on irrecoverable parse error.
+.    */
+.  public Object yyparse (yyInput yyLex, Object yydebug)
+.				throws java.io.IOException, yyException {
+t    this.yydebug = (jay.yydebug.yyDebug)yydebug;
+.    return yyparse(yyLex);
+.  }
+.
+.  /** initial size and increment of the state/value stack [default 256].
+.      This is not final so that it can be overwritten outside of invocations
+.      of yyparse().
+.    */
+.  protected int yyMax;
+.
+.  /** executed at the beginning of a reduce action.
+.      Used as $$ = yyDefault($1), prior to the user-specified action, if any.
+.      Can be overwritten to provide deep copy, etc.
+.      @param first value for $1, or null.
+.      @return first.
+.    */
+.  protected Object yyDefault (Object first) {
+.    return first;
+.  }
+.
+.  /** the generated parser.
+.      Maintains a state and a value stack, currently with fixed maximum size.
+.      @param yyLex scanner.
+.      @return result of the last reduction, if any.
+.      @throws yyException on irrecoverable parse error.
+.    */
+.  public Object yyparse (yyInput yyLex)
+.				throws java.io.IOException, yyException {
+.    YyCheckClass.yyCheckInit();                         // initial yyCheck eingefuegt PL 05-03-08
+.    YyTableClass.yyTableInit();                         // initial yyCheck eingefuegt PL 05-03-08
+.    if (yyMax <= 0) yyMax = 256;			// initial size
+.    int yyState = 0, yyStates[] = new int[yyMax];	// state stack
+.    Object yyVal = null, yyVals[] = new Object[yyMax];	// value stack
+.    /*modified by diho, 14.04.2004
+.      orig: int yyToken = -1 was replaced by "empty Token"*/
+.    yyTokenclass yyToken = new yyTokenclass();		// current input
+.    int yyErrorFlag = 0;				// #tks to shift
+.
+ local		## %{ ... %} after the first %%
+
+.    yyLoop: for (int yyTop = 0;; ++ yyTop) {
+.      if (yyTop >= yyStates.length) {			// dynamically increase
+.        int[] i = new int[yyStates.length+yyMax];
+.        System.arraycopy(yyStates, 0, i, 0, yyStates.length);
+.        yyStates = i;
+.        Object[] o = new Object[yyVals.length+yyMax];
+.        System.arraycopy(yyVals, 0, o, 0, yyVals.length);
+.        yyVals = o;
+.      }
+.      yyStates[yyTop] = yyState;
+.      yyVals[yyTop] = yyVal;
+t      if (yydebug != null) yydebug.push(yyState, yyVal);
+.
+.      yyDiscarded: for (;;) {	// discarding a token does not change stack
+.        int yyN;
+.        if ((yyN = YyDefRedClass.yyDefRed[yyState]) == 0) {	// else [default] reduce (yyN)
+.          /* modified by diho, 14.04.2004
+.             if "empty token", get next token */
+.          if (yyToken.tokennr <0) {
+.          /* modified by diho, 10.04.2004 
+.          call yyLex.advance in any case, check if yyToken is EOF */
+.            yyToken = yyLex.advance(); /*? yyLex.token() : 0;*/
+.           /* modified by diho, 27.04.2004
+.             if "null", create EOF token */
+.            if (yyToken == null) {yyToken = new EOF();}
+.
+t            if (yydebug != null)
+t          /* modified by diho, 14.04.2004
+t             orig.: yydebug.lex(yyState, yyToken, yyname(yyToken), yyLex.value()); */
+t              yydebug.lex(yyState, yyToken.tokennr, yyname(yyToken.tokennr), yyToken.value);
+.          }
+.          /* modified by diho, 14.04.2004 
+.             replaced yyToken by yyToken.tokennr*/
+.          if ((yyN = YySindexClass.yySindex[yyState]) != 0 && (yyN += yyToken.tokennr) >= 0
+.          /* modified by diho, 14.04.2004 
+.             replaced yyToken by yyToken.tokennr*/
+.              && yyN < YyTableClass.yyTable.length && YyCheckClass.yyCheck[yyN] == yyToken.tokennr) {
+t            if (yydebug != null)
+t              yydebug.shift(yyState, YyTableClass.yyTable[yyN], yyErrorFlag-1);
+.            yyState = YyTableClass.yyTable[yyN];		// shift to yyN
+.          /* modified by diho, 14.04.2004 
+.             replaced yyLex.value() by yyToken.value*/
+.            yyVal = yyToken.value;
+.          /* modified by diho, 14.04.2004 
+.             orig:  yyToken = -1 */
+.            yyToken = new yyTokenclass();
+.            if (yyErrorFlag > 0) -- yyErrorFlag;
+.            continue yyLoop;
+.          }
+.          /* modified by diho, 14.04.2004 
+.             replaced yyToken by yyToken.tokennr*/
+.          if ((yyN = YyRindexClass.yyRindex[yyState]) != 0 && (yyN += yyToken.tokennr) >= 0
+.          /* modified by diho, 14.04.2004 
+.             replaced yyToken by yyToken.tokennr*/
+.              && yyN < YyTableClass.yyTable.length && YyCheckClass.yyCheck[yyN] == yyToken.tokennr)
+.            yyN = YyTableClass.yyTable[yyN];			// reduce (yyN)
+.          else
+.            switch (yyErrorFlag) {
+.  
+.            case 0:
+.              yyerror("syntax error", yyExpecting(yyState));
+t              if (yydebug != null) yydebug.error("syntax error");
+.  
+.            case 1: case 2:
+.              yyErrorFlag = 3;
+.              do {
+.                if ((yyN = YySindexClass.yySindex[yyStates[yyTop]]) != 0
+.                    && (yyN += yyErrorCode) >= 0 && yyN < YyTableClass.yyTable.length
+.                    && YyCheckClass.yyCheck[yyN] == yyErrorCode) {
+t                  if (yydebug != null)
+t                    yydebug.shift(yyStates[yyTop], YyTableClass.yyTable[yyN], 3);
+.                  yyState = YyTableClass.yyTable[yyN];
+.          /* modified by diho, 14.04.2004 
+.             replaced yyLex.value by yyToken.value*/
+.                  yyVal = yyToken.value;
+.                  continue yyLoop;
+.                }
+t                if (yydebug != null) yydebug.pop(yyStates[yyTop]);
+.              } while (-- yyTop >= 0);
+t              if (yydebug != null) yydebug.reject();
+.              throw new yyException("irrecoverable syntax error");
+.  
+.            case 3:
+.          /* modified by diho, 14.04.2004 
+.             orig.: if (yyToken == 0)*/
+.              if (yyToken == null) {
+t                if (yydebug != null) yydebug.reject();
+.                throw new yyException("irrecoverable syntax error at end-of-file");
+.              }
+t              if (yydebug != null)
+.          /* modified by diho, 14.04.2004 
+.             replaced yyToken by yyToken.tokennr, yyLex.value by yyToken.value*/
+t                yydebug.discard(yyState, yyToken.tokennr, yyname(yyToken.tokennr),
+t  							yyToken.value);
+.          /* modified by diho, 14.04.2004 
+.             orig: yyToken = -1*/
+.              yyToken = new yyTokenclass();
+.              continue yyDiscarded;		// leave stack alone
+.            }
+.        }
+.        int yyV = yyTop + 1-YyLenClass.yyLen[yyN];
+t        if (yydebug != null)
+t          yydebug.reduce(yyState, yyStates[yyV-1], yyN, YyRuleClass.yyRule[yyN], YyLenClass.yyLen[yyN]);
+.        yyVal = yyDefault(yyV > yyTop ? null : yyVals[yyV]);
+.        switch (yyN) {
+
+ actions		## code from the actions within the grammar
+
+.        }
+.        yyTop -= YyLenClass.yyLen[yyN];
+.        yyState = yyStates[yyTop];
+.        int yyM = YyLhsClass.yyLhs[yyN];
+.        if (yyState == 0 && yyM == 0) {
+t          if (yydebug != null) yydebug.shift(0, yyFinal);
+.          yyState = yyFinal;
+.          /* modified by diho, 14.04.2004 
+.             replaced yyToken by yyToken.tokennr*/
+.          if (yyToken.tokennr < 0) {
+.          /** modified by diho, 10.04.2004
+.          */
+.            yyToken = yyLex.advance(); /* ? yyLex.token() : 0;*/
+.          /* modified by diho, 14.04.2004
+.             if "empty token", get next token */
+.            if (yyToken == null) {yyToken = new EOF();}
+t            if (yydebug != null)
+.          /* modified by diho, 14.04.2004 
+.             replaced yyToken by yyToken.tokennr, yyLex.value() by yyToken.value*/
+t               yydebug.lex(yyState, yyToken.tokennr,yyname(yyToken.tokennr), yyToken.value);
+.          }
+.          /* modified by diho, 14.04.2004 
+.             orig.: if (yyToken == 0) */
+.          if (yyToken.tokennr == 0) {
+t            if (yydebug != null) yydebug.accept(yyVal);
+.            return yyVal;
+.          }
+.          continue yyLoop;
+.        }
+.        if ((yyN = YyGindexClass.yyGindex[yyM]) != 0 && (yyN += yyState) >= 0
+.            && yyN < YyTableClass.yyTable.length && YyCheckClass.yyCheck[yyN] == yyState)
+.          yyState = YyTableClass.yyTable[yyN];
+.        else
+.          yyState = YyDgotoClass.yyDgoto[yyM];
+t        if (yydebug != null) yydebug.shift(yyStates[yyTop], yyState);
+.	 continue yyLoop;
+.      }
+.    }
+.  }
+.
+ tables			## tables for rules, default reduction, and action calls
+.
+ debug			## tables for debugging support
+.
+ epilog			## text following second %%
+ 
+# modified by diho, 11.02.2004
+.class yyTokenclass {	
+.   public int tokennr;	
+.   public Object value;
+.
+.   yyTokenclass () {
+.      this.tokennr=-1;
+.   }
+.   yyTokenclass (Object o) {
+.      this.value = o;
+.   }
+.}
+.class EOF extends yyTokenclass {	
+.
+.   EOF () {
+.      super();
+.      this.tokennr=0;
+.   }
+.}
+
+
+# end of modification
+.// %token constants
+.
+# modified by diho, 11.02.2004
+ tokens final class
+# end of modification

test

@@ -0,0 +1 @@
+4 + 3 - 2

test2

@@ -0,0 +1,23 @@
+
+
+<html>
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+  <title>Spoon-Knife</title>
+  <LINK href="styles.css" rel="stylesheet" type="text/css">
+</head>
+
+<body>
+
+<img src="forkit.gif" id="octocat" alt="" />
+
+<!-- Feel free to change this text here -->
+<p>
+  Fork me? Fork you, @octocat!
+</p>
+<p>
+  Sean made a change
+</p>
+
+</body>
+</html>

y.output

@@ -0,0 +1,128 @@
+   0  $accept : S $end
+
+   1  S : KLAMMERAUF S KLAMMERZU
+   2    | S operationszeichen S
+   3    | ZAHL
+
+   4  operationszeichen : PLUS
+   5                    | MAL
+   6                    | MINUS
+   7                    | GETEILT
+
+state 0
+	$accept : . S $end  (0)
+
+	KLAMMERAUF  shift 1
+	ZAHL  shift 2
+	.  error
+
+	S  goto 3
+
+
+state 1
+	S : KLAMMERAUF . S KLAMMERZU  (1)
+
+	KLAMMERAUF  shift 1
+	ZAHL  shift 2
+	.  error
+
+	S  goto 4
+
+
+state 2
+	S : ZAHL .  (3)
+
+	.  reduce 3
+
+
+state 3
+	$accept : S . $end  (0)
+	S : S . operationszeichen S  (2)
+
+	$end  accept
+	PLUS  shift 5
+	MAL  shift 6
+	MINUS  shift 7
+	GETEILT  shift 8
+	.  error
+
+	operationszeichen  goto 9
+
+
+state 4
+	S : KLAMMERAUF S . KLAMMERZU  (1)
+	S : S . operationszeichen S  (2)
+
+	PLUS  shift 5
+	MAL  shift 6
+	MINUS  shift 7
+	GETEILT  shift 8
+	KLAMMERZU  shift 10
+	.  error
+
+	operationszeichen  goto 9
+
+
+state 5
+	operationszeichen : PLUS .  (4)
+
+	.  reduce 4
+
+
+state 6
+	operationszeichen : MAL .  (5)
+
+	.  reduce 5
+
+
+state 7
+	operationszeichen : MINUS .  (6)
+
+	.  reduce 6
+
+
+state 8
+	operationszeichen : GETEILT .  (7)
+
+	.  reduce 7
+
+
+state 9
+	S : S operationszeichen . S  (2)
+
+	KLAMMERAUF  shift 1
+	ZAHL  shift 2
+	.  error
+
+	S  goto 11
+
+
+state 10
+	S : KLAMMERAUF S KLAMMERZU .  (1)
+
+	.  reduce 1
+
+
+11: shift/reduce conflict (shift 5, reduce 2) on PLUS
+11: shift/reduce conflict (shift 6, reduce 2) on MAL
+11: shift/reduce conflict (shift 7, reduce 2) on MINUS
+11: shift/reduce conflict (shift 8, reduce 2) on GETEILT
+state 11
+	S : S . operationszeichen S  (2)
+	S : S operationszeichen S .  (2)
+
+	PLUS  shift 5
+	MAL  shift 6
+	MINUS  shift 7
+	GETEILT  shift 8
+	$end  reduce 2
+	KLAMMERZU  reduce 2
+
+	operationszeichen  goto 9
+
+
+State 11 contains 4 shift/reduce conflicts.
+
+
+10 terminals, 3 nonterminals
+8 grammar rules, 12 states