SemVer Parsing

Version.swift

import Foundation


/// https://semver.org/
struct Version: Comparable, CustomStringConvertible {
    
    let major: Int
    let minor: Int
    let patch: Int
    
    var description: String {
        return "\(major).\(minor).\(patch)"
    }
    
    
    init(major: Int, minor: Int, patch: Int) {
        self.major = major
        self.minor = minor
        self.patch = patch
    }
    
    init(_ str: String) {
        let parts = str.split(on: ".")
        if parts.count >= 3 {
            major = Int(parts[0]) ?? 0
            minor = Int(parts[1]) ?? 0
            patch = Int(parts[2]) ?? 0
        } else if parts.count == 2 {
            major = Int(parts[0]) ?? 0
            minor = Int(parts[1]) ?? 0
            patch = 0
        } else if parts.count == 1 {
            major = Int(parts[0]) ?? 0
            minor = 0
            patch = 0
        } else {
            major = 0
            minor = 0
            patch = 0
        }
    }
    
    public static func < (lhs: Version, rhs: Version) -> Bool {
        if lhs.major != rhs.major {
            return lhs.major < rhs.major
        } else if lhs.minor != rhs.minor {
            return lhs.minor < rhs.minor
        } else {
            return lhs.patch < rhs.patch
        }
    }
    
    public static func == (lhs: Version, rhs: Version) -> Bool {
        return lhs.major == rhs.major && lhs.minor == rhs.minor && lhs.patch == rhs.patch
    }
    
}

VersionTests.swift

@testable import SoglasieLK
import XCTest


final class VersionTests: XCTestCase {
        
    func testCompare() {
        XCTAssertEqual(Version("1"), Version("1"))
        XCTAssertEqual(Version("1.1"), Version("1.1"))
        XCTAssertEqual(Version("1.1.1"), Version("1.1.1"))
        XCTAssertEqual(Version("1"), Version("1.0"))
        XCTAssertEqual(Version("1"), Version("1.0.0"))
        XCTAssertEqual(Version("1.0"), Version("1.0.0"))
        
        XCTAssertGreaterThan(Version("1.0.1"), Version("1.0.0"))
        XCTAssertGreaterThan(Version("1.1.0"), Version("1.0.0"))
        XCTAssertGreaterThan(Version("2.0.0"), Version("1.0.0"))
        XCTAssertGreaterThan(Version("1.10.0"), Version("1.5.0"))
        XCTAssertGreaterThan(Version("1.1"), Version("1.0"))
        XCTAssertGreaterThan(Version("1.10"), Version("1.5"))
    }
    
}