use worker to avoid freezing

main.js

@@ -16,7 +16,11 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 import { tokenize } from "./modules/lexer.js";
 import { shunt } from "./modules/parser.js";
-import { compute } from "./modules/compute.js";
+
+const worker = new Worker("./modules/compute.js");
+worker.addEventListener("message", (message) => {
+	document.querySelector("#result").value = message.data;
+});
 
 function evaluate() {
 	const expr = document.querySelector("#expr");
@@ -44,13 +48,8 @@ function evaluate() {
 
 	console.log(queue);
 
-	try {
-		result.value = compute(queue, m);
-	} catch(e) {
-		result.value = e;
-		console.log(e);
-		return;
-	}
+	worker.postMessage({command: "compute", queue, m});
+	result.value = "calculating...";
 }
 
 const expr = document.querySelector("#expr");

modules/compute.js

@@ -14,7 +14,17 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
-import { modinv, modpow, modsqrt, ord } from "./math.js";
+importScripts("./math.js")
+
+addEventListener("message", (message) => {
+	if (message.data.command === "compute") {
+		try {
+			compute(message.data.queue, message.data.m);
+		} catch(e) {
+			postMessage(e);
+		}
+	}
+});
 
 function binaryOpPop(stack) {
 	const b = stack.pop();
@@ -88,7 +98,5 @@ function compute(queue, modulus) {
 		result += modulus;
 	}
 
-	return result;
+	postMessage(result);
 }
-
-export { compute };

modules/math.js

@@ -220,5 +220,3 @@ function ord(n, modulus) {
 
 	return k;
 }
-
-export { modsqrt, modinv, modpow, ord };