Better string handling

common/space_lua/runtime.test.ts

@@ -4,9 +4,10 @@ import {
   luaLen,
   LuaMultiRes,
   LuaStackFrame,
+  luaToString,
 } from "$common/space_lua/runtime.ts";
 
-Deno.test("Test Lua Rutime", () => {
+Deno.test("Test Lua Rutime", async () => {
   // Test LuaMultires
   assertEquals(new LuaMultiRes([]).flatten().values, []);
   assertEquals(new LuaMultiRes([1, 2, 3]).flatten().values, [1, 2, 3]);
@@ -42,4 +43,9 @@ Deno.test("Test Lua Rutime", () => {
   // Functions in objects
   luaVal = jsToLuaValue({ name: "Pete", first: (l: any[]) => l[0] });
   assertEquals(luaVal.get("first").call(LuaStackFrame.lostFrame, [1, 2, 3]), 1);
+
+  // Test luaToString
+  assertEquals(await luaToString(new Promise((resolve) => resolve(1))), "1");
+  assertEquals(await luaToString({ a: 1 }), "{a = 1}");
+  assertEquals(await luaToString([{ a: 1 }]), "{{a = 1}}");
 });

common/space_lua/runtime.ts

@@ -678,15 +678,54 @@ export function luaTruthy(value: any): boolean {
   return true;
 }
 
-export function luaToString(value: any): string | Promise<string> {
+export async function luaToString(value: any): Promise<string> {
   if (value === null || value === undefined) {
     return "nil";
   }
+  if (value instanceof Promise) {
+    return luaToString(await value);
+  }
   if (value.toStringAsync) {
     return value.toStringAsync();
   }
-  if (value.toString) {
+  // Handle plain JavaScript objects in a Lua-like format
-    return value.toString();
+  if (typeof value === "object") {
+    let result = "{";
+    let first = true;
+
+    // Handle arrays
+    if (Array.isArray(value)) {
+      for (const val of value) {
+        if (first) {
+          first = false;
+        } else {
+          result += ", ";
+        }
+        // Recursively stringify the value
+        const strVal = await luaToString(val);
+        result += strVal;
+      }
+      return result + "}";
+    }
+
+    // Handle objects
+    for (const [key, val] of Object.entries(value)) {
+      if (first) {
+        first = false;
+      } else {
+        result += ", ";
+      }
+      if (/^[a-zA-Z_][a-zA-Z0-9_]*$/.test(key)) {
+        result += `${key} = `;
+      } else {
+        result += `["${key}"] = `;
+      }
+      // Recursively stringify the value
+      const strVal = await luaToString(val);
+      result += strVal;
+    }
+    result += "}";
+    return result;
   }
   return String(value);
 }