@thi.ng/buffers/sliding.js

General purpose and generic read/write buffer implementations with different behaviors/orderings

import { FIFOBuffer } from "./fifo.js";
const sliding = (cap) => new SlidingBuffer(cap);
class SlidingBuffer extends FIFOBuffer {
  copy() {
    const buf = new SlidingBuffer(1);
    buf.buf = this.buf.slice();
    buf.rpos = this.rpos;
    buf.wpos = this.wpos;
    buf.len = this.len;
    return buf;
  }
  writable() {
    return true;
  }
  write(x) {
    if (!super.writable()) {
      const { buf, rpos } = this;
      buf[rpos] = void 0;
      this.rpos = (rpos + 1) % buf.length;
      this.len--;
    }
    return super.write(x);
  }
}
export {
  SlidingBuffer,
  sliding
};