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backend/node_modules/effect/dist/esm/internal/ringBuffer.js

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+import * as Chunk from "../Chunk.js";
+import { constUndefined } from "../Function.js";
+import * as Option from "../Option.js";
+/** @internal */
+export class RingBuffer {
+  capacity;
+  array;
+  size = 0;
+  current = 0;
+  constructor(capacity) {
+    this.capacity = capacity;
+    this.array = Array.from({
+      length: capacity
+    }, constUndefined);
+  }
+  head() {
+    return Option.fromNullable(this.array[this.current]);
+  }
+  lastOrNull() {
+    if (this.size === 0) {
+      return undefined;
+    }
+    const index = this.current === 0 ? this.array.length - 1 : this.current - 1;
+    return this.array[index] ?? undefined;
+  }
+  put(value) {
+    this.array[this.current] = value;
+    this.increment();
+  }
+  dropLast() {
+    if (this.size > 0) {
+      this.decrement();
+      this.array[this.current] = undefined;
+    }
+  }
+  toChunk() {
+    const begin = this.current - this.size;
+    const newArray = begin < 0 ? [...this.array.slice(this.capacity + begin, this.capacity), ...this.array.slice(0, this.current)] : this.array.slice(begin, this.current);
+    return Chunk.fromIterable(newArray);
+  }
+  increment() {
+    if (this.size < this.capacity) {
+      this.size += 1;
+    }
+    this.current = (this.current + 1) % this.capacity;
+  }
+  decrement() {
+    this.size -= 1;
+    if (this.current > 0) {
+      this.current -= 1;
+    } else {
+      this.current = this.capacity - 1;
+    }
+  }
+}
+//# sourceMappingURL=ringBuffer.js.map