Created
April 10, 2024 16:10
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Kotlin Regex generator for semver/maven versioning style (<major>.<minor>.<patch>)
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| data class Group(val matches: Boolean, val testedVersions: MutableList<String>) { | |
| val range: String get() = "[${testedVersions.first()} - ${testedVersions.last()}]" | |
| } | |
| fun main() { | |
| val major = 2 | |
| val minor = 62 | |
| val patch = 103 | |
| println("Input version: $major.$minor.$patch") | |
| val regexStr = "^" + higherVersionRegex(major, minor, patch) | |
| println("Regex: $regexStr") | |
| println("") | |
| val regex = Regex(regexStr) | |
| verify(regex, false) | |
| verify(regex, true) | |
| } | |
| private fun verify(regex: Regex, isRegister: Boolean) { | |
| println("---------------------") | |
| println("Verifying regex: ${regex.pattern} on ${if (isRegister) "REGISTER" else "non-register"} versions") | |
| val bruteforceMax = 250 | |
| println("Brute forcing all versions... (from 0.0.0 to $bruteforceMax.$bruteforceMax.$bruteforceMax)") | |
| val groups = mutableListOf<Group>() | |
| var versionCount = 0 | |
| bruteforceVersions(maxNumber = bruteforceMax) | |
| .map { if (isRegister) "$it-reg" else it } | |
| .forEach { testVersion -> | |
| val matches = regex.matchAt(testVersion, 0) | |
| val lastGroup = groups.lastOrNull() | |
| val isMatch = matches != null && matches.range.start == 0 | |
| if (lastGroup != null && lastGroup.matches == isMatch) { | |
| lastGroup.testedVersions.add(testVersion) | |
| } else { | |
| groups.add(Group(isMatch, mutableListOf(testVersion))) | |
| } | |
| versionCount++ | |
| } | |
| println("Bruteforce Done!") | |
| println("$versionCount versions tested against the regex.") | |
| println("") | |
| println("Groups:") | |
| groups.forEach { | |
| println("${it.range} - ${if (it.matches) "ENABLED" else "DISABLED"} (${it.testedVersions.size} versions)") | |
| } | |
| println("") | |
| if (groups.size > 2) { | |
| println("Warning: More than 2 groups detected. This is not expected!") | |
| } | |
| } | |
| fun bruteforceVersions(maxNumber: Int) = generateSequence("0.0.0") { | |
| val (major, minor, patch) = it.split('.').map { it.toInt() } | |
| var newPatch = patch + 1 | |
| var newMinor = if (newPatch > maxNumber) { | |
| newPatch = 0 | |
| minor + 1 | |
| } else minor | |
| val newMajor = if (newMinor > maxNumber) { | |
| newMinor = 0 | |
| major + 1 | |
| } else major | |
| if (newMajor > maxNumber) return@generateSequence null // Stop the sequence | |
| "$newMajor.$newMinor.$newPatch" | |
| } | |
| fun higherVersionRegex(major: Int, minor: Int, patch: Int): String { | |
| val possibilities = buildList<String> { | |
| add("$major\\.$minor\\.${higherNumberRegex(patch)}") | |
| add("$major\\.${higherNumberRegex(minor + 1)}\\.[0-9]+") | |
| add("${higherNumberRegex(major + 1)}\\.[0-9]+\\.[0-9]+") | |
| } | |
| return possibilities.joinToString(separator = "|", prefix = "(", postfix = ")") | |
| } | |
| fun higherNumberRegex(input: Int): String { | |
| val inputStr = input.toString() | |
| val inputStrLength = inputStr.length | |
| val possibilities = buildList { | |
| (1..inputStrLength).forEach { index -> | |
| add( | |
| inputStr.replaceRange( | |
| inputStrLength - index, inputStrLength, | |
| "[${inputStr[inputStrLength - index] + if (index == 1) 0 else 1}-9]" + "[0-9]".repeat(index - 1) | |
| ) | |
| ) | |
| } | |
| add("[0-9]{${inputStrLength + 1},}") | |
| } | |
| return possibilities.joinToString(separator = "|", prefix = "(", postfix = ")") | |
| } |
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