import { isObject, isSymbol } from '@vue/shared'

const NAN = 0 / 0

const reTrim = /^\s+|\s+$/g
const reIsBinary = /^0b[01]+$/i
const reIsOctal = /^0o[0-7]+$/i
const reIsBadHex = /^[-+]0x[0-9a-f]+$/i

export function toNumber(value: any) {
  if (typeof value == 'number') {
    return value
  }
  if (isSymbol(value)) {
    return NAN
  }
  if (isObject(value)) {
    const other = typeof value.valueOf == 'function' ? value.valueOf() : value
    value = isObject(other) ? `${other}` : other
  }
  if (typeof value != 'string') {
    return value === 0 ? value : +value
  }
  value = value.replace(reTrim, '')
  const isBinary = reIsBinary.test(value)
  return isBinary || reIsOctal.test(value)
    ? Number.parseInt(value.slice(2), isBinary ? 2 : 8)
    : reIsBadHex.test(value)
    ? NAN
    : +value
}