Amend quill_html_converter to retain style attributes

quill_html_converter/lib/quill_html_converter.dart

@@ -1,10 +1,9 @@
 library quill_html_converter;
 
 import 'package:dart_quill_delta/dart_quill_delta.dart';
-import 'package:vsc_quill_delta_to_html/vsc_quill_delta_to_html.dart'
-    as conventer show ConverterOptions, QuillDeltaToHtmlConverter;
+import 'package:vsc_quill_delta_to_html/vsc_quill_delta_to_html.dart';
 
-typedef ConverterOptions = conventer.ConverterOptions;
+export 'package:vsc_quill_delta_to_html/vsc_quill_delta_to_html.dart';
 
 /// A extension for [Delta] which comes from `flutter_quill` to extends
 /// the functionality of it to support converting the [Delta] to/from HTML
@@ -19,10 +18,33 @@ extension DeltaHtmlExt on Delta {
   /// that designed specifically for converting the quill delta to html
   String toHtml({ConverterOptions? options}) {
     final json = toJson();
-    final html = conventer.QuillDeltaToHtmlConverter(
+    final html = QuillDeltaToHtmlConverter(
       List.castFrom(json),
-      options,
+      options ?? defaultConverterOptions,
     ).convert();
     return html;
   }
 }
+
+ConverterOptions get defaultConverterOptions {
+  return ConverterOptions(
+    converterOptions: OpConverterOptions(
+      customTagAttributes: (op) => parseStyle(op.attributes['style']),
+    ),
+  );
+}
+
+Map<String, String>? parseStyle(String? style, [Map<String, String>? attrs]) {
+  if (style == null || style.isEmpty) return attrs;
+
+  attrs ??= <String, String>{};
+
+  for (var e in style.split(';')) {
+    if ((e = e.trim()).isEmpty) break;
+    var kv = e.split(':');
+    if (kv.length < 2) break;
+    var key = kv[0].trim();
+    attrs[key] = kv[1].trim();
+  }
+  return attrs;
+}