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class HexToc {

  constructor(bitValueArrayLength, singleBitLength, config) {

    const defaultConfig = {
      




      reverse: false,
      



      noPrefix: false,
      



      separator: ""
    }

    



    this.bitValueArray = [0];

    



    this.singleBitLength = 2;

    


    this.config = {
      ...defaultConfig,
      ...config
    };

    if (typeof bitValueArrayLength === "number" && bitValueArrayLength > 0) {
      this.#resizeBitValueArray(bitValueArrayLength);
    }

    if (typeof singleBitLength === "number" && singleBitLength > 0) {
      this.singleBitLength = singleBitLength;
    }
  }

  





  #resizeBitValueArray(length) {
    const increment = length - this.bitValueArray.length;
    if (increment < 0) {
      console.error("不能缩减 bitValueArray 长度");
      return;
    }
    for (let i = 0; i < increment; i++) {
      this.bitValueArray.push(0);
    }
  }

  





  #convertDecToHex(dec) {
    if (typeof dec !== "number") {
      console.error("参数 dec 必须为数值类型");
      return;
    }
    return dec.toString(16).padStart(this.singleBitLength, "0").slice(-this.singleBitLength).toUpperCase();
  }

  


  toString() {
    let res = "";
    for (const dec of this.bitValueArray) {
      res = this.config.reverse ? `${res}${this.config.separator}${this.#convertDecToHex(dec)}` : `${this.#convertDecToHex(dec)}${this.config.separator}${res}`;
    }
    return this.config.noPrefix ? res : `0x${res}`;
  }

  


  getRawData() {
    return this.bitValueArray;
  }

  





  setBitValueByArrayIndex(arrayIndex, dec) {
    if (arrayIndex < 0) {
      console.error("arrayIndex 不能小于 0");
      return;
    }
    if (arrayIndex > this.bitValueArray.length) {
      console.error("arrayIndex 不能大于 bitValueArray 长度");
      return;
    }
    this.bitValueArray[arrayIndex] = dec;
    return this;
  }

  





  setBitValueByTocDepth(tocDepth, dec) {
    if (tocDepth - 1 < 0) {
      console.error("tocDepth - 1 不能小于 0\n或许你应该使用 setBitValueByArrayIndex() ？");
      return;
    }
    if (tocDepth - 1 > this.bitValueArray.length) {
      console.error("tocDepth - 1 不能大于 bitValueArray 长度");
      return;
    }
    this.bitValueArray[tocDepth - 1] = dec;
    return this;
  }

  



  setBitValueArray(decArray) {
    for (let i = 0; i < decArray.length; i++) {
      this.bitValueArray[i] = decArray[i];
    }
    return this;
  }
}