Solution to level 13 in Untrusted: http://alex.nisnevich.com/untrusted/

untrusted-lvl13-solution.js

/*
 * robotMaze.js
 *
 * The blue key is inside a labyrinth, and extracting
 * it will not be easy.
 *
 * It's a good thing that you're a AI expert, or
 * we would have to leave empty-handed.
 */

function startLevel(map) {
    // Hint: you can press R or 5 to "rest" and not move the
    // player, while the robot moves around.

    map.getRandomInt = function(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }

    map.placePlayer(map.getWidth()-1, map.getHeight()-1);
    var player = map.getPlayer();

    map.defineObject('robot', {
        'type': 'dynamic',
        'symbol': 'R',
        'color': 'gray',
        'onCollision': function (player, me) {
            me.giveItemTo(player, 'blueKey');
        },
        'behavior': function (me) {
            //Afficher les coordonnées du Robot
            map.writeStatus("Robot X : "+me.getX()+" Robot Y : "+me.getY());
            
            //previous coordonates
            var previousX = me.getX();
            var previousY = me.getY();
            
            //Si on jouxte une clef, alors on va sur la 
            //case contenant le clef !
            //N
            if(map.getObjectTypeAt(previousX, previousY-1)=='blueKey'){
            
                //Alors on bouche dans la direction de la clef
                me.move('up');
            }
            //E
            if(map.getObjectTypeAt(previousX+1, previousY)=='blueKey'){
                
                //Alors on bouche dans la direction de la clef
                me.move('right');
            }
            //S
            if(map.getObjectTypeAt(previousX, previousY+1)=='blueKey'){
                
                //Alors on bouche dans la direction de la clef
                me.move('down');
            }
            //W
            if(map.getObjectTypeAt(previousX-1, previousY)=='blueKey'){
                
                //Alors on bouche dans la direction de la clef
                me.move('left');
            }
            
            //Pareil pour le portail : barrier (qui est toujours au Sud)
            if(map.getObjectTypeAt(previousX, previousY+1)=='barrier'){
            
                //Alors on bouche dans la direction de la clef
                me.move('down');
                //Et on rebouche l'entrée du maze
                map.placeObject(previousX, previousY, 'block');
            }
            
            // move randomly
            var moves = map.getAdjacentEmptyCells(me.getX(), me.getY());
            // getAdjacentEmptyCells gives array of ((x, y), direction) pairs
            me.move(moves[map.getRandomInt(0, moves.length - 1)][1]);
            
            //next coordonates
            var nextX = me.getX();
            var nextY = me.getY();
            
            //Si on vient de passer par une porte
            //Alors on la bouche
            if((map.getObjectTypeAt(previousX-1, previousY)=='block'
                && map.getObjectTypeAt(previousX+1, previousY)=='block')
                | (map.getObjectTypeAt(previousX, previousY-1)=='block'
                && map.getObjectTypeAt(previousX, previousY+1)=='block')){
                
                //Alors on bouche la porte avec un bloc
                //map.placeObject(previousX, previousY, 'block');
            }
            
            //Pour accélérer, on va boucher aussi les coins
            //Coin S-E
            if(map.getObjectTypeAt(previousX, previousY+1)=='block'
                && map.getObjectTypeAt(previousX+1, previousY)=='block'){
                
                //Alors on bouche la porte avec un bloc
                map.placeObject(previousX, previousY, 'block');
            }

            //Coin S-W
            if(map.getObjectTypeAt(previousX, previousY+1)=='block'
                && map.getObjectTypeAt(previousX-1, previousY)=='block'){
                
                //Alors on bouche la porte avec un bloc
                map.placeObject(previousX, previousY, 'block');
            }

            //Coin N-E
            if(map.getObjectTypeAt(previousX, previousY-1)=='block'
                && map.getObjectTypeAt(previousX+1, previousY)=='block'){
                
                //Alors on bouche la porte avec un bloc
                map.placeObject(previousX, previousY, 'block');
            }

            //Coin N-W
            if(map.getObjectTypeAt(previousX, previousY-1)=='block'
                && map.getObjectTypeAt(previousX-1, previousY)=='block'){
                
                //Alors on bouche la porte avec un bloc
                map.placeObject(previousX, previousY, 'block');
            }
            
            











































        }
    });

    map.defineObject('barrier', {
        'symbol': '░',
        'color': 'purple',
        'impassable': true,
        'passableFor': ['robot']
    });

    map.placeObject(0, map.getHeight() - 1, 'exit');
    map.placeObject(1, 1, 'robot');
    map.placeObject(map.getWidth() - 2, 8, 'blueKey');
    map.placeObject(map.getWidth() - 2, 9, 'barrier');

    var autoGeneratedMaze = new ROT.Map.DividedMaze(map.getWidth(), 10);
    autoGeneratedMaze.create( function (x, y, mapValue) {
        // don't write maze over robot or barrier
        if ((x == 1 && y == 1) || (x == map.getWidth() - 2 && y >= 8)) {
            return 0;
        } else if (mapValue === 1) { //0 is empty space 1 is wall
            map.placeObject(x,y, 'block');
        } else {
            map.placeObject(x,y,'empty');
        }
    });
}

function validateLevel(map) {
    map.validateExactlyXManyObjects(1, 'exit');
    map.validateExactlyXManyObjects(1, 'robot');
    map.validateAtMostXObjects(1, 'blueKey');
}

function onExit(map) {
    if (!map.getPlayer().hasItem('blueKey')) {
        map.writeStatus("We need to get that key!");
        return false;
    } else {
        return true;
    }
}