data/edge5/video/v2/+

app/src/helpers/topic-match.ts

@@ -0,0 +1,38 @@
+export function topicMatchesFilter(filter: string, topic: string): boolean {
+  const filterParts = filter.split('/')
+  const topicParts = topic.split('/')
+
+  let fi = 0
+  let ti = 0
+
+  while (fi < filterParts.length) {
+    const segment = filterParts[fi]
+
+    if (segment === '#') {
+      return fi === filterParts.length - 1
+    }
+
+    if (ti >= topicParts.length) {
+      return false
+    }
+
+    if (segment === '+') {
+      fi++
+      ti++
+      continue
+    }
+
+    if (segment !== topicParts[ti]) {
+      return false
+    }
+
+    fi++
+    ti++
+  }
+
+  return ti === topicParts.length
+}
+
+export function lastTopicSegment(topic: string): string {
+  return topic.split('/').at(-1) ?? ''
+}