From 843d2d5b1f173540a4fa2d7004cf731bb485deba Mon Sep 17 00:00:00 2001
From: Simon Rozman <simon@rozman.si>
Date: Tue, 18 Jun 2024 09:35:14 +0200
Subject: [PATCH] Prevent duplicate service registrations

---
 service.js | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/service.js b/service.js
index b150703..44faa6f 100644
--- a/service.js
+++ b/service.js
@@ -87,6 +87,17 @@ class BesService {
     this.clearCorrectionPanel()
   }
 
+  /**
+   * Returns grammar checking service registered for given DOM element
+   *
+   * @param {Element} hostElement Host element
+   * @returns Grammar checking service registered for given DOM element; unfedined if no service
+   *          registered.
+   */
+  static getServiceByElement(hostElement) {
+    return besServices.find(service => service.hostElement === hostElement)
+  }
+
   /**
    * Called initially when grammar-checking run is started
    */
@@ -796,7 +807,9 @@ class BesDOMService extends BesTreeService {
    * @returns {BesDOMService} Grammar checking service instance
    */
   static register(hostElement) {
-    let service = new BesDOMService(hostElement)
+    let service = BesService.getServiceByElement(hostElement)
+    if (service) return service
+    service = new BesDOMService(hostElement)
     service.proofAll()
     return service
   }
@@ -878,7 +891,9 @@ class BesCKService extends BesTreeService {
    * @returns {BesCKService} Grammar checking service instance
    */
   static register(hostElement, ckEditorInstance) {
-    let service = new BesCKService(hostElement, ckEditorInstance)
+    let service = BesService.getServiceByElement(hostElement)
+    if (service) return service
+    service = new BesCKService(hostElement, ckEditorInstance)
     service.proofAll()
     return service
   }
@@ -1289,7 +1304,7 @@ class BesPlainTextService extends BesService {
 
   /**
    * Simple string compare.
-   * 
+   *
    * For performance reasons, this method compares only string beginnings and endings. Maximum one
    * difference is reported.
    *
@@ -1347,7 +1362,9 @@ class BesDOMPlainTextService extends BesPlainTextService {
    * @returns {BesDOMPlainTextService} Grammar checking service instance
    */
   static register(hostElement) {
-    let service = new BesDOMPlainTextService(hostElement)
+    let service = BesService.getServiceByElement(hostElement)
+    if (service) return service
+    service = new BesDOMPlainTextService(hostElement)
     service.proofAll()
     return service
   }
@@ -1483,7 +1500,9 @@ class BesTAService extends BesPlainTextService {
    * @returns {BesTAService} Grammar checking service instance
    */
   static register(hostElement) {
-    let service = new BesTAService(hostElement)
+    let service = BesService.getServiceByElement(hostElement)
+    if (service) return service
+    service = new BesTAService(hostElement)
     service.proofAll()
     return service
   }