some more cart infrastructure

builtins.ts

@@ -3,6 +3,7 @@ import {
 	clearScreen,
 } from "./window.ts";
 import { font } from "./font.ts";
+// import { codeSheet } from "./sheet.ts";
 
 // deno-fmt-ignore
 const sprites = [
@@ -53,9 +54,10 @@ const drawText = (x: number, y: number, text: string) => {
 }
 
 const faux = {
-	clearScreen,
-	drawSprite,
-	drawText,
+	clear_screen: clearScreen,
+	draw_sprite: drawSprite,
+	draw_text: drawText,
+	// code_sheet: codeSheet,
 };
 
 export default faux;

cart.ts

@@ -0,0 +1,11 @@
+import fakeCart from "./cart_unpacked.json" assert { type: "json" };
+
+const cart = fakeCart;
+
+export const loadCart = (_name: string) => {
+	return;
+}
+
+export const getCart = () => {
+	return cart;
+}

cart_tools.ts

@@ -1,31 +0,0 @@
-import faux from "./builtins.ts";
-
-export type SheetType = "code" | "spritesheet" | "map" | "sfx" | "patterns" | "fonts";
-
-export const parseCodeSheet = (sheet: string) => {
-	try {
-		new Function(sheet);
-	} catch (err) {
-		throw err;
-	}
-	// deno-lint-ignore no-explicit-any
-	const G: any = {...faux, faux, log: console.log};
-	const context = new Proxy(G, {
-		get: (target, prop) => {
-			return target[prop];
-		},
-		set: (target, prop, value) => {
-			target[prop] = value;
-			return true;
-		},
-		has: () => {
-			return true;
-		},
-	});
-	const fn = new Function("context", `
-		with (context) {
-			${sheet}
-		}
-	`);
-	return fn(context);
-}

cart_unpacked.json

@@ -1,6 +1,10 @@
 [
 	{
 		"sheet_type": "code",
-		"value": "return {init: () => {}, update: () => {}, draw: () => {clearScreen(); drawText(0, 0, 'hello world')}}"
+		"value": "x = code_sheet(1);\nreturn {init: () => {y = 0}, update: () => {y += speed; if (y > 127) {y = -6}}, draw: () => {clear_screen(); draw_text(x, y, 'hello world')}}"
+	},
+	{
+		"sheet_type": "code",
+		"value": "speed = 2; return 8"
 	}
 ]

game.ts

@@ -1,19 +0,0 @@
-import faux from "./builtins.ts";
-
-let y = 0;
-
-export default {
-	init() {
-		
-	},
-	update() {
-		y++;
-		if (y>127) {
-			y=-5;
-		}
-	},
-	draw() {
-		faux.clearScreen();
-		faux.drawText(0, y, "hello, world");
-	},
-}

index.ts

@@ -2,10 +2,9 @@ import {
 	mainloop,
 	frame,
 } from "./window.ts";
-import cart from "./cart_unpacked.json" assert { type: "json" };
-import { parseCodeSheet } from "./cart_tools.ts";
+import { codeSheet } from "./sheet.ts";
 
-const game = parseCodeSheet(cart[0].value);
+const game = codeSheet(0);
 
 game.init();
 

sheet.ts

@@ -0,0 +1,38 @@
+import faux from "./builtins.ts";
+import { getCart } from "./cart.ts";
+
+export type SheetType = "code" | "spritesheet" | "map" | "sfx" | "patterns" | "fonts";
+
+const getSheet = (n: number) => {
+	return getCart()[n].value;
+}
+
+export const codeSheet = (sheet: number) => {
+	const code = getSheet(sheet);
+	try {
+		new Function(code);
+	} catch (err) {
+		throw err;
+	}
+	const fn = new Function("context", `
+		with (context) {
+			${code}
+		}
+	`);
+	return fn(context);
+}
+
+// deno-lint-ignore no-explicit-any
+const G: any = {...faux, faux, log: console.log, code_sheet: codeSheet};
+const context = new Proxy(G, {
+	get: (target, prop) => {
+		return target[prop];
+	},
+	set: (target, prop, value) => {
+		target[prop] = value;
+		return true;
+	},
+	has: () => {
+		return true;
+	},
+});