Method getOffset

packages/runtime/src/types/xstring.ts:67–107

(input: {offset?: number | INumeric | Hex | Integer8, length?: number | INumeric | Hex | Integer8})

  public get(): string {
    return this.value;
  }

  public getOffset(input: {offset?: number | INumeric | Hex | Integer8, length?: number | INumeric | Hex | Integer8}) {
    let offset = input?.offset;
    if (offset) {
      if (offset instanceof Integer8) {
        offset = Number(offset.get());
      } else {
        offset = parse(offset);
      }
      if (offset * 2 > this.value.length
          || offset < 0) {
        throwError("CX_SY_RANGE_OUT_OF_BOUNDS");
      }
    }

    let length = input?.length;
    if (length) {
      if (length instanceof Integer8) {
        length = Number(length.get());
      } else {
        length = parse(length);
      }
      if (length * 2 > this.value.length
          || length < 0) {
        throwError("CX_SY_RANGE_OUT_OF_BOUNDS");
      }
    }

    // NOTE: this only copies the minimal length of the string,
    if (offset !== undefined && length !== undefined) {
      if (offset * 2 + length * 2 > this.value.length) {
        throwError("CX_SY_RANGE_OUT_OF_BOUNDS");
      }
      return new XString().set(this.value.substr(offset * 2, length * 2));
    } else if (offset !== undefined) {
      return new XString().set(this.value.substr(offset * 2));
    } else if (length !== undefined) {
      return new XString().set(this.value.substr(0, length * 2));
    } else {
      throw new Error("xstring: getOffset, unexpected");
    }
  }
}