Allow to serialize reference to a constructor in the namespace

README.md

@@ -23,7 +23,15 @@ uncompressed.
 In deno:
 
 ```typescript
-import { Serializer } from "https://code.thunderk.net/typescript/serializer/raw/branch/master/mod.ts";
+import { Serializer } from "https://js.thunderk.net/serializer/mod.ts";
+```
+
+In browser:
+
+```html
+<script type="module">
+import { Serializer } from "https://js.thunderk.net/serializer/mod.js";
+</script>
 ```
 
 ## Use

TODO.md

@@ -1 +1,3 @@
+# TODO
+
 - Add protocol version, to handle breaking changes

doc/usage.md

@@ -3,7 +3,15 @@
 In deno:
 
 ```typescript
-import { Serializer } from "https://code.thunderk.net/typescript/serializer/raw/branch/master/mod.ts";
+import { Serializer } from "https://js.thunderk.net/serializer/mod.ts";
+```
+
+In browser:
+
+```html
+<script type="module">
+import { Serializer } from "https://js.thunderk.net/serializer/mod.js";
+</script>
 ```
 
 ## Use

serializer.test.ts

@@ -1,8 +1,9 @@
 import {
+  describe,
   expect,
   it,
   mock,
-} from "https://code.thunderk.net/typescript/devtools/raw/1.2.2/testing.ts";
+} from "https://code.thunderk.net/typescript/devtools/raw/1.3.0/testing.ts";
 import { Serializer } from "./serializer.ts";
 
 class TestSerializerObj1 {
@@ -62,6 +63,7 @@ function checkReversability(
   return loaded;
 }
 
+describe(Serializer, () => {
   it("serializes simple objects", () => {
     var obj = {
       "a": 5,
@@ -97,6 +99,11 @@ it("restores objects constructed from class", () => {
     expect(loaded).toBeInstanceOf(TestSerializerObj1);
   });
 
+  it("serializes reference to class type", () => {
+    let loaded = checkReversability(TestSerializerObj1);
+    expect(loaded).toBe(TestSerializerObj1);
+  });
+
   it("stores one version of the same object", () => {
     var a = new TestSerializerObj1(8);
     var b = new TestSerializerObj1(8);
@@ -157,7 +164,7 @@ it("ignores functions", () => {
     let data = serializer.serialize({ obj: new TestSerializerObj2() });
     let loaded = serializer.unserialize(data);
 
-  let expected = <any> new TestSerializerObj2();
+    let expected: any = new TestSerializerObj2();
     expected.a = undefined;
     expected.b[0] = undefined;
     expect(loaded).toEqual({ obj: expected });
@@ -204,3 +211,4 @@ it("uses namespace alias to protect from property mangling", () => {
     expect(serializer1.unserialize(dumped1)).toEqual(data);
     expect(serializer2.unserialize(dumped2)).toEqual(data);
   });
+});

serializer.ts

@@ -41,18 +41,32 @@ export class Serializer {
     // Collect objects
     var objects: Object[] = [];
     var stats: any = {};
+
+    function add(value: any): void {
+      if (objects.indexOf(value) < 0) {
+        objects.push(value);
+      }
+    }
+
     crawl(obj, (value) => {
       if (isObject(value)) {
         var vtype = classname(value);
         if (vtype != "" && this.ignored.indexOf(vtype) < 0) {
           stats[vtype] = (stats[vtype] || 0) + 1;
-          if (objects.indexOf(value) < 0) {
-            objects.push(value);
-          }
+          add(value);
           return value;
         } else {
           return STOP_CRAWLING;
         }
+      } else if (typeof value == "function") {
+        const found = Object.entries(this.namespace).find(([_, cons]) =>
+          cons === value
+        );
+        if (found && this.ignored.indexOf(found[0]) < 0) {
+          // Keep references to constructors in the namespace
+          add(value);
+        }
+        return STOP_CRAWLING;
       } else {
         return value;
       }
@@ -63,7 +77,8 @@ export class Serializer {
     var fobjects = objects.map((value) => this.encodeObject(value));
     return JSON.stringify(fobjects, (key, value) => {
       if (
-        key != "$f" && isObject(value) && !value.hasOwnProperty("$c") &&
+        key != "$f" && (isObject(value) || typeof value == "function") &&
+        !value.hasOwnProperty("$c") &&
         !value.hasOwnProperty("$i")
       ) {
         return { $i: objects.indexOf(value) };
@@ -132,6 +147,10 @@ export class Serializer {
         $c: ctype,
         $f: Array.from(obj),
       };
+    } else if (typeof obj == "function") {
+      return {
+        $c: obj.name,
+      };
     } else {
       return {
         $c: this.namespace_rev[ctype] || ctype,
@@ -149,8 +168,10 @@ export class Serializer {
       return new Set(objdata.$f);
     } else if (ctype == "Map") {
       return new Map(objdata.$f);
-    } else {
+    } else if (objdata.$f) {
       return Object.assign(this.constructObject(ctype), objdata.$f);
+    } else {
+      return this.namespace[ctype];
     }
   }
 }
@@ -159,7 +180,8 @@ export class Serializer {
  * Check if the argument is an instance of a class
  */
 function isObject(value: any): boolean {
-  return value instanceof Object && !Array.isArray(value);
+  return typeof value == "object" && value instanceof Object &&
+    !Array.isArray(value);
 }
 
 /**
@@ -174,7 +196,7 @@ function crawl(
   callback: (item: any) => any,
   replace = false,
   memo: any[] = [],
-) {
+): any {
   if (isObject(obj)) {
     if (memo.indexOf(obj) >= 0) {
       return obj;
@@ -183,11 +205,11 @@ function crawl(
     }
   }
 
-  if (obj !== undefined && obj !== null && typeof obj != "function") {
+  if (obj !== undefined && obj !== null) {
     const result = callback(obj);
 
     if (result === STOP_CRAWLING) {
-      return;
+      return undefined;
     }
 
     if (Array.isArray(obj)) {
@@ -244,5 +266,5 @@ function crawl(
  * Get the class name of an object.
  */
 function classname(obj: Object): string {
-  return (<any> obj.constructor).name;
+  return obj.constructor.name;
 }