+rm -r $PRE_SCANNER_OUTPUT_PATH/*
+rm -r $GRAMMER_OUTPUT_PATH/*
+rm -r $UTIL_OUTPUT_PATH/*
+
+mkdir -p $PRE_SCANNER_OUTPUT_PATH
+mkdir -p $GRAMMER_OUTPUT_PATH
+mkdir -p $UTIL_OUTPUT_PATH
+
+java -cp $JAVACC_PATH/javacc.jar javacc -OUTPUT_DIRECTORY=$PRE_SCANNER_OUTPUT_PATH $PRE_SCANNER_FILE
+java -cp $JAVACC_PATH/javacc.jar javacc -OUTPUT_DIRECTORY=$GRAMMER_OUTPUT_PATH $GRAMMER_FILE
+java -cp $JAVACC_PATH/javacc.jar javacc -OUTPUT_DIRECTORY=$UTIL_OUTPUT_PATH $UTIL_FILE