/**
 * 表达式执行异常，将显示执行异常的位置信息
 */
export default class ExpressionException extends Error {
  constructor(source: string, pos: number, cause: Error) {
    let message: string
    let beforeErrorContent: string = source.substring(0, pos).trim()
    const length: number = beforeErrorContent.length
    if (length > 1000) {
      beforeErrorContent = `以上省略......\n${beforeErrorContent.substring(length - 1000)}`
    }
    const afterErrorContent: string = source.substring(pos)
    const afterErrorContentIndex: number = afterErrorContent.indexOf('\n')
    if (afterErrorContentIndex === -1) {
      message = `${beforeErrorContent.trim()} <- ${afterErrorContent}`
    }
    else {
      message = `${beforeErrorContent.trim()} <- ${afterErrorContent.substring(0, afterErrorContentIndex)}\n后续省略......`
    }

    // 通过原生 Error 的 cause 参数传递原因
    super(message, { cause })
    this.name = this.constructor.name

    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, this.constructor)
    }
  }
}