JS MOO-RPC fixes / additions:

  * Fix parsing of results
  * Add 'get_property'

crates/web-host/src/client/root.html

@@ -22,7 +22,7 @@
             } else if (typeof json === "object") {
                 if (json["error_code"]) {
                     return json["error_name"];
-                } else if (json["oid"]) {
+                } else if (json["oid"] != null) {
                     return "#" + json["oid"];
                 } else if (Array.isArray(json)) {
                     let result = "{";
@@ -42,13 +42,24 @@
             }
         }
 
+        function transform_args(args) {
+            let result = [];
+            for (let i = 0; i < args.length; i++) {
+                result.push(json_to_moo(args[i]));
+            }
+            return result.join(", ");
+        }
 
         // Recursively descend a JSON result from eval, and turns object references into MooRPCObjects.
         function transform_eval(json) {
+            // Empty json is null, so return null.
+            if (json == null) {
+                return null;
+            }
             if (typeof json != "object") {
                 return json;
             }
-             if (json["oid"]) {
+             if (json["oid"] != null) {
                 return new MoorRPCObject(json["oid"], context.auth_token);
             } else if (Array.isArray(json)) {
                 let result = [];
@@ -76,18 +87,20 @@
             // "return #<object_id>:<verb>(<args>)"
             async invoke_verb(verb_name, args) {
                 let self = json_to_moo(this.object_id)
-                let verbargs = json_to_moo(args);
-                let expr = "return " + self + ":" + verb_name + "(" + verbargs + ")";
+                let args_str = transform_args(args);
+                let expr = "return #" + self + ":" + verb_name + "(" + args_str + ");";
+                return perform_eval(this.auth_token, expr);
+            }
+
+            async get_property(property_name) {
+                let self = json_to_moo(this.object_id);
+                let expr = "return #" + self + "." + property_name + ";";
                 return perform_eval(this.auth_token, expr);
             }
         }
 
         async function call_builtin(auth_token, builtin, args) {
-            let argument_elements = [];
-            for (let i = 0; i < args.length; i++) {
-                argument_elements.push(json_to_moo(args[i]));
-            }
-            let args_str = argument_elements.join(", ");
+            let args_str = transform_args(args);
             let expr = "return " + builtin + "(" + args_str + ");";
             return perform_eval(auth_token, expr);
         }