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import Shared
import Foundation
private enum Constants {
static let codeMinimum = Localized.Validator.Code.minimum
static let emailRegex = Localized.Validator.Email.regex
static let emailInvalid = Localized.Validator.Email.invalid
static let phoneMinimum = Localized.Validator.Phone.minimum
static let phoneMaximum = Localized.Validator.Phone.maximum
static let phoneRegexIssue = Localized.Validator.Phone.regexIssue
static let usernameEmpty = Localized.Validator.Username.empty
static let usernameRegex = Localized.Validator.Username.regex
static let usernameMinimum = Localized.Validator.Username.minimum
static let usernameMaximum = Localized.Validator.Username.maximum
static let usernameInvalid = Localized.Validator.Username.invalid
static let usernameApproved = Localized.Validator.Username.approved
static let usernameStartEndInvalid = Localized.Validator.Username.startEnd
}
public enum ValidationResult {
case success(String?)
case failure(String)
}
public struct Validator<T> {
public var validate: (T) -> ValidationResult
}
public extension Validator where T == (String, String) {
static var phone: Self {
Validator { regex, phone -> ValidationResult in
guard phone.count >= 4 else {
return .failure(Constants.phoneMinimum)
}
guard phone.count <= 30 else {
return .failure(Constants.phoneMaximum)
}
let regularExpression = try? NSRegularExpression(pattern: regex)
guard let regex = regularExpression, regex.firstMatch(in: phone, options: [], range: phone.fullRange()) != nil else {
return .failure(Constants.phoneRegexIssue)
}
return .success(nil)
}
}
}
public extension Validator where T == String {
static var username: Self {
Validator { username -> ValidationResult in
guard username.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty == false else {
return .failure(Constants.usernameEmpty)
}
guard let first = username.first,
let last = username.last,
(first.isLetter || first.isNumber),
(last.isLetter || last.isNumber) else {
return .failure(Constants.usernameStartEndInvalid)
}
guard username.trimmingCharacters(in: .whitespacesAndNewlines).count >= 4 else {
return .failure(Constants.usernameMinimum)
}
guard username.trimmingCharacters(in: .whitespacesAndNewlines).count <= 32 else {
return .failure(Constants.usernameMaximum)
}
let regex = try? NSRegularExpression(pattern: Constants.usernameRegex)
guard let regex = regex, regex.firstMatch(in: username, options: [], range: username.fullRange()) != nil else {
return .failure(Constants.usernameInvalid)
}
return .success(Constants.usernameApproved)
}
}
static var email: Self {
Validator { string -> ValidationResult in
let detector = try? NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
let matches = detector?.matches(in: string, options: [], range: string.fullRange())
guard let match = matches?.first,
matches?.count == 1,
match.url?.scheme == "mailto",
match.range == string.fullRange() else { return .failure(Constants.emailInvalid) }
return .success(nil)
}
}
static var code: Self {
Validator { code -> ValidationResult in
guard code.count >= 4 else {
return .failure(Constants.codeMinimum)
}
return .success(nil)
}
}
}
private extension String {
func fullRange() -> NSRange {
NSRange(self.startIndex..., in: self)
}
}