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import Foundation
/*
Perl Weekly Challenge - 063
Task #2: Rotate String
https://perlweeklychallenge.org/blog/perl-weekly-challenge-063
*/
enum ParamError: Error {
case missingWord
case invalidWord
}
do {
let paramCount:Int = Int(CommandLine.argc)
if paramCount <= 1 {
throw ParamError.missingWord
}
let word:String = CommandLine.arguments[1]
if isValidWord(word) {
let size:Int = word.count;
var temp:String = word
var i:Int = 1
var c:Int = 1
while i <= size {
let partA:String = String(temp.substring(to: i))
let partB:String = String(temp.substring(from: i))
temp = partB + partA
print("[\(c)]: [\(temp)]")
if temp == word {
break
}
i = i + 1
c = c + 1
if i > size {
i = 1
}
}
print("Rotation: \(c)")
}
else {
throw ParamError.invalidWord
}
}
catch ParamError.missingWord {
print("Missing word.")
}
catch ParamError.invalidWord {
print("Invalid word.")
}
catch let error {
print(error)
}
//
//
// Function
func isValidWord(_ word:String) -> Bool {
let pattern = "^[xy]+$"
let regex = try! NSRegularExpression(pattern: pattern, options: .caseInsensitive)
let range = NSRange(location: 0, length: word.utf16.count)
if regex.firstMatch(in: word, options: [], range: range) != nil {
return true
}
else {
return false
}
}
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