StoneMason! XD

/*
 * File: StoneMasonKarel.java
 * --------------------------
 * Karel builds and or repairs columns.
 */



import stanford.karel.*;

public class StoneMasonKarel extends SuperKarel {
        public void run (){

                // if front is clear, then we're NOT on the last column, so we can build a column, and move to the next column starting point.
                while (frontIsClear()) {
                        buildColumn () ;
                        moveToNextColumn () ;
                }

                // build the last column, now that we have no more space to the east ;-)
                buildColumn();

        }


        /* Place a beeper on this spot, if there ISN'T already one there
         * Done in this one spot, to avoid typing the noBeeper check all over the place!
         * */
        private void beeper()
        {
            if (noBeepersPresent()) { putBeeper(); }
        }


        private void buildColumn () {
                // faceing east at start, so turn left to go up the column
                turnLeft () ;

                // put a beeper straight away, so we don't miss the starting spot
                beeper();

                // while we have space in front, move into that space, and place a beeper
                while (frontIsClear()) {
                    move();
                    beeper();
                }

                /* at this point, we should be at the top, with a beeper/stone in all spots */

                // turn around to face down
                turnAround();

                // while we can move down, do so
                while (frontIsClear()) { move(); }

                // turn left to back in starting orientation
                turnLeft();
        }


        private void moveToNextColumn () {
                for (int i=0; i<4;i++) {
                        move () ;
                }
        }

}