Created
November 29, 2018 07:25
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compare string version in Swift
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struct Version { | |
let rawValue: String | |
init(_ string: String) { | |
self.rawValue = string | |
} | |
enum CompareResult { | |
case greaterThan | |
case equal | |
case lessThan | |
} | |
func compareWithVersion(version: Version) -> CompareResult { | |
var v1 = rawValue.split(separator: ".").map { Int($0) ?? 0 } | |
var v2 = version.rawValue.split(separator: ".").map { Int($0) ?? 0 } | |
for i in 0..<max(v1.count, v2.count) { | |
let left = i >= v1.count ? 0 : v1[i] | |
let right = i >= v2.count ? 0 : v2[i] | |
if left > right { | |
return .greaterThan | |
} else if right > left { | |
return .lessThan | |
} | |
} | |
return .equal | |
} | |
static func ==(lhs: Version, rhs: Version) -> Bool { | |
return lhs.compareWithVersion(version: rhs) == .equal | |
} | |
static func <(lhs: Version, rhs: Version) -> Bool { | |
return lhs.compareWithVersion(version: rhs) == .lessThan | |
} | |
static func >(lhs: Version, rhs: Version) -> Bool { | |
return lhs.compareWithVersion(version: rhs) == .greaterThan | |
} | |
static func >=(lhs: Version, rhs: Version) -> Bool { | |
return lhs.compareWithVersion(version: rhs) == .greaterThan || lhs.compareWithVersion(version: rhs) == .equal | |
} | |
static func <=(lhs: Version, rhs: Version) -> Bool { | |
return lhs.compareWithVersion(version: rhs) == .lessThan || lhs.compareWithVersion(version: rhs) == .equal | |
} | |
} | |
Version("1.0") < Version("1.0.0") | |
Version("1.0") <= Version("1.0.0") | |
Version("1.1") > Version("1.2.0") | |
Version("1.2.1") > Version("1.2.1") |
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