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'use strict'; var RingBuffer = function(bufferSize) { this._bufferSize = bufferSize; this.clear(); }; RingBuffer.prototype.clear = function() { this._buffer = new Array(this._bufferSize); this._ringOffset = 0; this._ringSize = this._bufferSize; this._head = 0; this._tail = 0; this.length = 0; }; RingBuffer.prototype.push = function(value) { var expandBuffer = false, expandRing = false; if (this._ringSize < this._bufferSize) { expandBuffer = (this._tail === 0); } else if (this._ringOffset === this._ringSize) { expandBuffer = true; expandRing = (this._tail === 0); } if (expandBuffer) { this._tail = this._bufferSize; this._buffer = this._buffer.concat(new Array(this._bufferSize)); this._bufferSize = this._buffer.length; if (expandRing) this._ringSize = this._bufferSize; } this._buffer[this._tail] = value; this.length += 1; if (this._tail < this._ringSize) this._ringOffset += 1; this._tail = (this._tail + 1) % this._bufferSize; }; RingBuffer.prototype.peek = function() { if (this.length === 0) return void 0; return this._buffer[this._head]; }; RingBuffer.prototype.shift = function() { if (this.length === 0) return void 0; var value = this._buffer[this._head]; this._buffer[this._head] = void 0; this.length -= 1; this._ringOffset -= 1; if (this._ringOffset === 0 && this.length > 0) { this._head = this._ringSize; this._ringOffset = this.length; this._ringSize = this._bufferSize; } else { this._head = (this._head + 1) % this._ringSize; } return value; }; module.exports = RingBuffer;