Initial commit

2026-07-14 11:11:36 +08:00
commit 656499cf94
604 changed files with 119518 additions and 0 deletions
@@ -0,0 +1,55 @@
+import '../contracts/danmaku.dart';
+
+const defaultDuplicateDanmakuMergeWindowSeconds = 1.0;
+
+final _whitespacePattern = RegExp(r'\s+');
+
+List<DanmakuComment> mergeDuplicateDanmakuComments(
+  Iterable<DanmakuComment> comments, {
+  double windowSeconds = defaultDuplicateDanmakuMergeWindowSeconds,
+}) {
+  if (windowSeconds < 0) {
+    throw ArgumentError.value(
+      windowSeconds,
+      'windowSeconds',
+      'must be non-negative',
+    );
+  }
+
+  final sorted = comments.toList()..sort(_compareDanmakuComments);
+  if (sorted.length < 2) return sorted;
+
+
+  final keptByText = <String, List<DanmakuComment>>{};
+  final passthrough = <DanmakuComment>[];
+
+  for (final comment in sorted) {
+    final key = _mergeKey(comment);
+    if (key.isEmpty) {
+      passthrough.add(comment);
+      continue;
+    }
+
+    final kept = keptByText.putIfAbsent(key, () => []);
+    final windowStart = kept.isEmpty ? null : kept.last.time;
+    if (windowStart == null || comment.time - windowStart > windowSeconds) {
+      kept.add(comment);
+    }
+  }
+
+  return <DanmakuComment>[
+    ...passthrough,
+    for (final kept in keptByText.values) ...kept,
+  ]..sort(_compareDanmakuComments);
+}
+
+int _compareDanmakuComments(DanmakuComment a, DanmakuComment b) {
+  final timeOrder = a.time.compareTo(b.time);
+  if (timeOrder != 0) return timeOrder;
+  return a.cid.compareTo(b.cid);
+}
+
+String _mergeKey(DanmakuComment comment) {
+  return comment.text.trim().replaceAll(_whitespacePattern, ' ');
+}
+