From b970fe547fa1bedafe20886c53b9b185b637e07d Mon Sep 17 00:00:00 2001
From: zorkow <volker.sorge@gmail.com>
Date: Sat, 16 Nov 2024 21:10:08 +0100
Subject: [PATCH] make SRE webworker ready

---
 ts/common/cli.ts             |  2 +-
 ts/common/dom_util.ts        |  2 +-
 ts/common/engine.ts          |  3 ++-
 ts/common/system.ts          |  2 +-
 ts/common/system_external.ts | 20 +++++++++++++++-----
 ts/common/xpath_util.ts      |  3 ++-
 6 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/ts/common/cli.ts b/ts/common/cli.ts
index 1d390b8ad..af27e3786 100644
--- a/ts/common/cli.ts
+++ b/ts/common/cli.ts
@@ -37,7 +37,7 @@ export class Cli {
   /**
    * Commander library.
    */
-  public static commander = SystemExternal.documentSupported
+  public static commander = (SystemExternal.documentSupported || SystemExternal.webworker)
     ? null
     : SystemExternal.extRequire('commander').program;
 
diff --git a/ts/common/dom_util.ts b/ts/common/dom_util.ts
index b673312dd..8ce1229db 100644
--- a/ts/common/dom_util.ts
+++ b/ts/common/dom_util.ts
@@ -73,7 +73,7 @@ export function parseInput(input: string): Element {
     );
     if (Engine.getInstance().mode === EngineConst.Mode.HTTP) {
       XpathUtil.xpath.currentDocument = doc;
-      return html ? doc.body.childNodes[0] : doc.documentElement;
+      return (html ? doc.body.childNodes[0] : doc.documentElement) as Element;
     }
     return doc.documentElement;
   } catch (err) {
diff --git a/ts/common/engine.ts b/ts/common/engine.ts
index 92a073b7c..96f2b74e8 100644
--- a/ts/common/engine.ts
+++ b/ts/common/engine.ts
@@ -22,6 +22,7 @@
 import { AuditoryDescription } from '../audio/auditory_description.js';
 import * as Dcstr from '../rule_engine/dynamic_cstr.js';
 import * as EngineConst from './engine_const.js';
+import { SystemExternal } from './system_external.js';
 
 import { Debugger } from './debugger.js';
 import { Variables } from './variables.js';
@@ -349,7 +350,7 @@ export class Engine {
    * @param feature An object describing some setup features.
    */
   public configurate(feature: { [key: string]: boolean | string }) {
-    if (this.mode === EngineConst.Mode.HTTP && !this.config) {
+    if (this.mode === EngineConst.Mode.HTTP && !SystemExternal.webworker && !this.config) {
       configBlocks(feature);
       this.config = true;
     }
diff --git a/ts/common/system.ts b/ts/common/system.ts
index fb15f7398..5a1c44f6d 100644
--- a/ts/common/system.ts
+++ b/ts/common/system.ts
@@ -405,7 +405,7 @@ export function exit(opt_value?: number) {
  */
 export const localePath = FileUtil.localePath;
 
-if (SystemExternal.documentSupported) {
+if (SystemExternal.documentSupported || SystemExternal.webworker) {
   setupEngine({ mode: EngineConst.Mode.HTTP }).then(() => setupEngine({}));
 } else {
   setupEngine({ mode: EngineConst.Mode.SYNC }).then(() =>
diff --git a/ts/common/system_external.ts b/ts/common/system_external.ts
index 1d95b75cc..0cc27387f 100644
--- a/ts/common/system_external.ts
+++ b/ts/common/system_external.ts
@@ -22,10 +22,13 @@
  */
 
 import { Variables } from './variables.js';
+import * as Xmldom from '@xmldom/xmldom';
+import * as wgx from 'wicked-good-xpath';
 
 declare let global: any;
 declare let require: (name: string) => any;
 declare let process: any;
+declare const DedicatedWorkerGlobalScope: any;
 
 export class SystemExternal {
 
@@ -59,19 +62,27 @@ export class SystemExternal {
     SystemExternal.windowSupported &&
     !(typeof window.document === 'undefined'))();
 
+  /**
+   * Check if webworker environment.
+   *
+   * @returns True if the DedicatedWorkerGlobalScope is available.
+   */
+  public static webworker: boolean = (() =>
+    !(typeof DedicatedWorkerGlobalScope === 'undefined'))();
+
   /**
    * Xmldom library.
    */
   public static xmldom = SystemExternal.documentSupported
     ? window
-    : SystemExternal.extRequire('@xmldom/xmldom');
+    : Xmldom;
 
   /**
    * DOM document implementation.
    */
   public static document: Document = SystemExternal.documentSupported
     ? window.document
-    : new SystemExternal.xmldom.DOMImplementation().createDocument('', '', 0);
+    : new SystemExternal.xmldom.DOMImplementation().createDocument('', '');
 
   /**
    * Xpath library.
@@ -80,7 +91,6 @@ export class SystemExternal {
     ? document
     : (function () {
         const window = { document: {}, XPathResult: {} };
-        const wgx = SystemExternal.extRequire('wicked-good-xpath');
         wgx.install(window);
         (window.document as any).XPathResult = window.XPathResult;
         return window.document;
@@ -97,7 +107,7 @@ export class SystemExternal {
   /**
    * Filesystem library.
    */
-  public static fs = SystemExternal.documentSupported
+  public static fs = SystemExternal.documentSupported || SystemExternal.webworker
     ? null
     : SystemExternal.extRequire('fs');
 
@@ -110,7 +120,7 @@ export class SystemExternal {
    * Path to JSON files.
    */
   public static jsonPath = (function () {
-    if (SystemExternal.documentSupported) {
+    if (SystemExternal.documentSupported || SystemExternal.webworker) {
       return SystemExternal.url;
     }
     if (process.env.SRE_JSON_PATH || global.SRE_JSON_PATH) {
diff --git a/ts/common/xpath_util.ts b/ts/common/xpath_util.ts
index 48e7f1358..ef0ee7f99 100644
--- a/ts/common/xpath_util.ts
+++ b/ts/common/xpath_util.ts
@@ -114,7 +114,8 @@ function evaluateXpath(
   rootNode: Node,
   type: number
 ): XPathResult {
-  return Engine.getInstance().mode === EngineConst.Mode.HTTP &&
+  return !SystemExternal.webworker &&
+    Engine.getInstance().mode === EngineConst.Mode.HTTP &&
     !Engine.getInstance().isIE &&
     !Engine.getInstance().isEdge
     ? xpath.currentDocument.evaluate(