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class Board {
field Array grid;
field int nTurn;
constructor Board new() {
let grid = Array.new(4);
var int i, j;
let i = 0;
while (i < 4) {
let j = 0;
let grid[i] = Array.new(4);
while (j < 4) {
let grid[i][j] = 32;
}
let i = i + 1;
}
let grid[0][0] = 65;
let nTurn = 0;
return this;
}
method void arrange(Array xs, boolean isHorizontal) {
if (isHorizontal) {
let grid = copy(xs)
} else {
let grid = transpose(xs)
}
}
method Array copy(Array xs) {
var Array ys;
let ys = Array.new(4);
var int i;
let i = 0;
while (i < 4) {
let ys[i] = xs[i];
let i = i + 1;
}
return ys;
}
method Array deepcopy(Array xs) {
var Array ys;
let ys = Array.new(4);
var int i;
let i = 0;
while (i < 4) {
let ys[i] = copy(xs[i]);
let i = i + 1;
}
return ys;
}
mothod Array transpose(Array xs){
var Array ys;
var int i, j;
let i = 0;
let ys = Array.new(4);
while (i < 4) {
let ys[i] = Array.new(4)
let j = 0;
while (j < 4) {
let ys[i][j] = xs[j][i];
let j = j + 1;
}
let i = i + 1;
}
return ys;
}
method Array getStrip(boolean isHorizontal){
var Array xs;
if (isHorizontal) {
let xs = deepcopy(grid);
} else {
let xs = transpose(grid);
}
return xs;
}
method Array align(Array xs, boolean left){
var int i, j;
let i = 0;
let j = 0;
if (left = true) {
while (i < 4) {
if (xs[i] > 96) {
let xs[j] = xs[i];
let j = j + 1;
}
let i = i + 1;
}
while (j < 4) {
let xs[j] = 32;
let j = j + 1;
}
} else {
while (i < 4) {
if (xs[3 - i] > 96) {
let xs[3 - j] = xs[3 - i];
let j = j + 1;
}
let i = i + 1;
}
while (j < 4) {
let xs[3 - j] = 32;
let j = j + 1;
}
}
return xs;
}
method Array reduce(Array xs, boolean left){
if ((xs[0] = xs[1]) & (xs[2] = xs[3])) {
if (left = true) {
let xs[0] = xs[0] + 1;
let xs[1] = xs[2] + 1;
let xs[2] = 32;
let xs[3] = 32;
} else {
let xs[3] = xs[3] + 1;
let xs[2] = xs[1] + 1;
let xs[1] = 32;
let xs[0] = 32;
}
return xs;
}
if (xs[0] = xs[1]) {
if (left = true) {
let xs[0] = xs[0] + 1;
let xs[1] = xs[2];
let xs[2] = xs[3];
let xs[3] = 32;
} else {
let xs[1] = xs[1] + 1;
let xs[0] = 32;
}
return xs;
}
if (xs[2] = xs[3]) {
if (left = true) {
let xs[2] = xs[2] + 1;
let xs[3] = 32;
} else {
let xs[3] = xs[3] + 1;
let xs[2] = xs[1];
let xs[1] = xs[0];
let xs[0] = 32;
}
return xs;
}
if (xs[1] = xs[2]) {
if (left = true) {
let xs[1] = xs[1] + 1;
let xs[2] = xs[3];
let xs[3] = 32;
} else {
let xs[2] = xs[2] + 1;
let xs[1] = xs[0]
let xs[0] = 32;
}
return xs;
}
return xs;
}
method void addTile(){
var int x, y;
var char z;
let x = nTurn;
let y = 23 * x * x + 79;
let x = y - (y / 16 * 16);
let r = x / 4;
let c = x - (r * 4);
let z = 97;
while (grid[r][c] > 96) {
let y = 23 * x * x + 79;
let x = y - (y / 16 * 16);
let r = x / 4;
let c = x - (r * 4);
let z = 195 - z;
}
let grid[r][c] = z;
return;
}
method void transform(char dir){
var boolean isHorizontal, left;
if ((dir = 0) or (dir = 1)) {
let left = true;
} else {
let left = false;
}
if ((dir = 0) or (dir = 2)) {
let isHorizontal = true;
} else {
let isHorizontal = false;
}
var Array xs;
let xs = getStrip(isHorizontal);
var int i;
let i = 0;
while (i < 4) {
xs[i] = reduce(align(xs[i], left), left);
}
do arrange(xs, isHorizontal);
return;
}
method void next(char dir){
do addTile();
let nTurn = nTurn + 1;
do transform(dir);
return;
}
method void draw(){
var int r, c, i, j;
let r = 9;
let c = 30;
let i = 0;
while (i < 4) {
let j = 0;
do Output.moveCursor(r + i, c);
while (j < 4) {
do Output.printChar(grid[i][j]);
let j = j + 1;
}
let i = i + 1;
}
}
method void dispose() {
do Memory.deAlloc(this);
}
}
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