Semver to Number

Semver2Number.ts

const defaultBitLength = 6
const maxBitLength = 16

function transformSemver2Number (semver: string): string {
  const [n1, n2, n3] = semver.split('.').map(Number)
  const maxNum = Math.max(n1, n2, n3)
  const minBitLength = Math.ceil(Math.log2(maxNum))
  const bitLength = Math.max(minBitLength, defaultBitLength)
  if (bitLength > maxBitLength) {
    throw new Error('semver too big!')
  }
  const numberVersion = (n1 << bitLength * 2) + (n2 << bitLength) + n3
  return (bitLength - defaultBitLength + 1).toString() + numberVersion
}

function transformNumber2Semver (numString: string) {
  const bitLength = +numString[0] + defaultBitLength - 1
  const numberVersion = +numString.slice(1)
  const n3 = numberVersion & (1 << bitLength) - 1
  const n2 = numberVersion >> bitLength & (1 << bitLength) - 1
  const n1 = numberVersion >> bitLength * 2 & (1 << bitLength) - 1
  return `${n1}.${n2}.${n3}`
}

console.log(transformSemver2Number('1.1.1')) // 14161
console.log(transformSemver2Number('1.2.3')) // 14227
console.log(transformSemver2Number('1.4.3')) // 14355
console.log(transformSemver2Number('2.0.0')) // 18192
console.log(transformSemver2Number('4.3.1')) // 116577
console.log(transformSemver2Number('255.255.255')) // 316777215
console.log(transformSemver2Number('1.999.3')) // 32071555

console.log(transformNumber2Semver('14227')) // 1.2.3
console.log(transformNumber2Semver('316777215')) // 999.999.999
console.log(transformNumber2Semver('52071555')) // 1.999.3