43 lines
1.0 KiB
JavaScript
43 lines
1.0 KiB
JavaScript
function Grid(size, changeCallback) {
|
|
var grid = new Array(size);
|
|
var modified = false;
|
|
var data = {
|
|
grid: grid,
|
|
size: size
|
|
};
|
|
|
|
this.get = function(row, col) {
|
|
if (isOutOfBounds(data, row, col)) throw new RangeError("Row or Column value out of bounds");
|
|
return grid[row] && grid[row][col];
|
|
}
|
|
this.set = function(row, col, value) {
|
|
if (isOutOfBounds(data, row, col)) throw new RangeError("Row or Column value out of bounds");
|
|
if (!grid[row]) grid[row] = new Array(size);
|
|
var before = grid[row][col];
|
|
grid[row][col] = value;
|
|
if (typeof changeCallback === "function") changeCallback(row, col, before, value);
|
|
modified = true;
|
|
return before;
|
|
}
|
|
this.reset = function() {
|
|
if (modified) {
|
|
grid = new Array(size);
|
|
modified = false;
|
|
}
|
|
}
|
|
this.isOutOfBounds = isOutOfBounds.bind(this, data);
|
|
|
|
Object.defineProperty(this, "size", {
|
|
get: function() {
|
|
return size;
|
|
},
|
|
enumerable: true
|
|
});
|
|
}
|
|
|
|
function isOutOfBounds(data, row, col) {
|
|
return row < 0 || row >= data.size || col < 0 || col >= data.size;
|
|
}
|
|
|
|
module.exports = Grid;
|