Format calendar event description

core/lib/presentation/utils/html_transformer/sanitize_autolink_filter.dart

@@ -7,6 +7,7 @@ import 'package:linkify/linkify.dart';
 class SanitizeAutolinkFilter {
 
   final HtmlEscape htmlEscape;
+  final bool escapeHtml;
   final _linkifyOption = const LinkifyOptions(
     humanize: true,
     looseUrl: true,
@@ -18,7 +19,7 @@ class SanitizeAutolinkFilter {
     const UrlLinkifier()
   ];
 
-  SanitizeAutolinkFilter(this.htmlEscape);
+  SanitizeAutolinkFilter(this.htmlEscape, {this.escapeHtml = true});
 
   String process(String inputText) {
     try {
@@ -36,7 +37,7 @@ class SanitizeAutolinkFilter {
 
       for (var element in elements) {
         if (element is TextElement) {
-          final escapedHtml = htmlEscape.convert(element.text);
+          final escapedHtml = escapeHtml ? htmlEscape.convert(element.text) : element.text;
           htmlTextBuffer.write(escapedHtml);
         } else if (element is EmailElement) {
           final emailLinkTag = _buildEmailLinkTag(

core/lib/presentation/utils/html_transformer/text/new_line_transformer.dart

@@ -0,0 +1,15 @@
+import 'dart:convert';
+
+import 'package:core/presentation/utils/html_transformer/base/text_transformer.dart';
+
+class NewLineTransformer extends TextTransformer {
+  const NewLineTransformer();
+
+  @override
+  String process(String text, HtmlEscape htmlEscape) {
+    return text
+      .replaceAll('\n', '<br>')
+      .replaceAll('\r', ' ')
+      .replaceAll('\t', '    ');
+  }
+}

core/lib/presentation/utils/html_transformer/text/sanitize_autolink_unescape_html_transformer.dart

@@ -0,0 +1,13 @@
+import 'dart:convert';
+
+import 'package:core/presentation/utils/html_transformer/base/text_transformer.dart';
+import 'package:core/presentation/utils/html_transformer/sanitize_autolink_filter.dart';
+
+class SanitizeAutolinkUnescapeHtmlTransformer extends TextTransformer {
+  const SanitizeAutolinkUnescapeHtmlTransformer();
+
+  @override
+  String process(String text, HtmlEscape htmlEscape) {
+    return SanitizeAutolinkFilter(htmlEscape, escapeHtml: false).process(text);
+  }
+}