Add viewed history, diagnostics, tag chips and SWF viewer

lib/backend/providers/gelbooru_provider.dart

@@ -148,13 +148,7 @@ class GelbooruProvider implements ContentProvider, CommentProvider {
   }
 
   List<PostComment> _commentsFromResponse(dynamic data, String postId) {
-    final raw = switch (data) {
-      List() => data,
-      {'comments': final List comments} => comments,
-      {'@attributes': _, 'comment': final List comments} => comments,
-      {'comment': final List comments} => comments,
-      _ => const [],
-    };
+    final raw = _commentItems(data);
     return raw
         .whereType<Map>()
         .map((item) {
@@ -165,10 +159,18 @@ class GelbooruProvider implements ContentProvider, CommentProvider {
             providerId: id,
             authorName: (json['creator'] ??
                     json['creator_name'] ??
+                    json['creator_id'] ??
+                    json['user'] ??
+                    json['username'] ??
                     json['author'] ??
                     '')
                 .toString(),
-            body: (json['body'] ?? json['comment'] ?? '').toString(),
+            body: (json['body'] ??
+                    json['comment'] ??
+                    json['content'] ??
+                    json['text'] ??
+                    '')
+                .toString(),
             createdAt: DateTime.tryParse(
                   (json['created_at'] ?? json['created'] ?? '').toString(),
                 ) ??
@@ -178,4 +180,66 @@ class GelbooruProvider implements ContentProvider, CommentProvider {
         .where((comment) => comment.body.trim().isNotEmpty)
         .toList();
   }
+
+  List<dynamic> _commentItems(dynamic data) {
+    if (data is List) return data;
+    if (data is String) return _commentItemsFromText(data);
+    if (data is! Map) return const [];
+    final json = Map<String, dynamic>.from(data);
+    final comments = json['comments'];
+    if (comments is List) return comments;
+    if (comments is Map) return _commentItems(comments);
+    final comment = json['comment'];
+    if (comment is List) return comment;
+    if (comment is Map) return [comment];
+    return const [];
+  }
+
+  List<Map<String, dynamic>> _commentItemsFromText(String text) {
+    final items = <Map<String, dynamic>>[];
+    for (final match in RegExp(r'<comment\b([^>]*)>(.*?)</comment>',
+            caseSensitive: false, dotAll: true)
+        .allMatches(text)) {
+      final attrs = _attributes(match.group(1) ?? '');
+      final body = _tagValue(match.group(2) ?? '', 'body') ??
+          _tagValue(match.group(2) ?? '', 'comment') ??
+          match.group(2) ??
+          '';
+      items.add({...attrs, 'body': body});
+    }
+    for (final match
+        in RegExp(r'<comment\b([^>]*)/?>', caseSensitive: false, dotAll: true)
+            .allMatches(text)) {
+      final attrs = _attributes(match.group(1) ?? '');
+      if (attrs.isNotEmpty) items.add(attrs);
+    }
+    return items;
+  }
+
+  Map<String, dynamic> _attributes(String source) {
+    final result = <String, dynamic>{};
+    for (final match in RegExp(r'''([A-Za-z0-9_:-]+)\s*=\s*["']([^"']*)["']''')
+        .allMatches(source)) {
+      result[match.group(1)!] = _decodeEntities(match.group(2) ?? '');
+    }
+    return result;
+  }
+
+  String? _tagValue(String source, String tag) {
+    final match =
+        RegExp('<$tag[^>]*>(.*?)</$tag>', caseSensitive: false, dotAll: true)
+            .firstMatch(source);
+    final value = match?.group(1);
+    return value == null ? null : _decodeEntities(value.trim());
+  }
+
+  String _decodeEntities(String value) {
+    return value
+        .replaceAll('&amp;', '&')
+        .replaceAll('&lt;', '<')
+        .replaceAll('&gt;', '>')
+        .replaceAll('&quot;', '"')
+        .replaceAll('&#039;', "'")
+        .replaceAll('&apos;', "'");
+  }
 }