Import AITURK IDE 1.0.0-beta.1 from Hermes 63279301; preserve MIT license

ui-tui/src/lib/circularBuffer.ts

@@ -0,0 +1,48 @@
+export class CircularBuffer<T> {
+  private buf: T[]
+  private head = 0
+  private len = 0
+
+  constructor(private capacity: number) {
+    if (!Number.isInteger(capacity) || capacity <= 0) {
+      throw new RangeError(`CircularBuffer capacity must be a positive integer, got ${capacity}`)
+    }
+
+    this.buf = new Array<T>(capacity)
+  }
+
+  push(item: T) {
+    this.buf[this.head] = item
+    this.head = (this.head + 1) % this.capacity
+
+    if (this.len < this.capacity) {
+      this.len++
+    }
+  }
+
+  tail(n = this.len): T[] {
+    const take = Math.min(Math.max(0, n), this.len)
+    const start = this.len < this.capacity ? 0 : this.head
+    const out: T[] = new Array<T>(take)
+
+    for (let i = 0; i < take; i++) {
+      out[i] = this.buf[(start + this.len - take + i) % this.capacity]!
+    }
+
+    return out
+  }
+
+  drain(): T[] {
+    const out = this.tail()
+
+    this.clear()
+
+    return out
+  }
+
+  clear() {
+    this.buf = new Array<T>(this.capacity)
+    this.head = 0
+    this.len = 0
+  }
+}