refactor: enhance HTML entities encoding by normalizing line breaks and handling null/undefined inputs

Author: Gabriele Panico

src/app/directives/html-entities-encode.pipe.ts

@@ -1,5 +1,5 @@
 import { Pipe, PipeTransform } from '@angular/core';
-import { htmlEntities, replaceEndOfLine } from 'src/chat21-core/utils/utils';
+import { htmlEntities } from 'src/chat21-core/utils/utils';
 
 @Pipe({
   name: 'htmlEntiesEncode'
@@ -8,10 +8,25 @@ import { htmlEntities, replaceEndOfLine } from 'src/chat21-core/utils/utils';
 export class HtmlEntitiesEncodePipe implements PipeTransform {
 
   transform(text: any, args?: any): any { 
-    text = htmlEntities(text);
-    text = replaceEndOfLine(text);
-    text = text.trim();
-    return text;
+    if (text === null || text === undefined) {
+      return text;
+    }
+
+    // Normalize line breaks BEFORE encoding HTML:
+    // - real CRLF/CR/LF to LF
+    // - escaped sequences (\n, \r, \r\n) to LF
+    // - HTML <br> tags (if present) to LF
+    let normalized = String(text)
+      .replace(/\r\n/g, '\n')
+      .replace(/\r/g, '\n')
+      .replace(/\\r\\n/g, '\n')
+      .replace(/\\n/g, '\n')
+      .replace(/\\r/g, '\n')
+      .replace(/<br\s*\/?>/gi, '\n');
+
+    normalized = htmlEntities(normalized);
+    normalized = normalized.trim();
+    return normalized;
   }
 
 }