big commit

static/js/components/tairu/tilemap.js

@@ -0,0 +1,42 @@
+export class Tilemap {
+    constructor(width, height) {
+        this.width = width;
+        this.height = height;
+        this.tiles = new Uint8Array(width * height);
+        this.default = 0;
+    }
+
+    tileIndex(x, y) {
+        return x + y * this.width;
+    }
+
+    inBounds(x, y) {
+        return x >= 0 && y >= 0 && x < this.width && y < this.height;
+    }
+
+    at(x, y) {
+        if (this.inBounds(x, y)) {
+            return this.tiles[this.tileIndex(x, y)];
+        } else {
+            return this.default;
+        }
+    }
+
+    setAt(x, y, tile) {
+        if (this.inBounds(x, y)) {
+            this.tiles[this.tileIndex(x, y)] = tile;
+        }
+    }
+
+    static parse(alphabet, lineArray) {
+        let tilemap = new Tilemap(lineArray[0].length, lineArray.length);
+        for (let y in lineArray) {
+            let line = lineArray[y];
+            for (let x = 0; x < line.length; ++x) {
+                let char = line.charAt(x);
+                tilemap.setAt(x, y, alphabet.indexOf(char));
+            }
+        }
+        return tilemap;
+    }
+}