Swift String validator

About

Library for easy and fastest string validation based on сciterias.

Instalation

KKStringValidator is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'KKStringValidator'

Main idea

For project to project you must validate some input fields, strings, etc for thay accept some criterias (like length, exist uppercase char, exist number, etc).

KKStringValidator helps to check string for needed criterias to be accepted.

Core features

• validate string by one or array of criterias
• aviable force fall(break validate) when criteria fail
• default criterias exist
• easy add custom criteria

Example

// import lib
import KKStringValidator

// code

    // Create criterias
    let lennghtCriteria = LengthCriteria(10)
    let regexpCriteria = RegexpCriteria("[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}")

    let criterias : [Criteriable] = [lennghtCriteria, UppercaseLetterExistCriteria(), LowercaseLetterExistCriteria(), NumberExistCriteria(), regexpCriteria]


    // validate
    StringValidator(criterias).isValide("q1Q", forceExit: false, result: { validator in
        switch validator {
            case .valid:
                print("All valid")
            case .notValid(let criteria):
                print(criteria.debugErrorString)
            case .notValides(let criterias):
                print("Criterias that fails:")
                _ = criterias.map({ print($0.debugErrorString)
                })
            }
    })

Output:

Criterias that fails:
DEBUG:LengthCriteria:Lenght less than 10
DEBUG:RegexpCriteria:no mutch to regexp [A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}

UITextFieldExtension

Also created extension for UITextField.

/// extension for UITextField for validation
extension UITextField {
/// function for validating textField text
///
/// - Parameters:
///   - criterias: array of criterias
///   - forceExit: flag for force extit. default in false
///   - result: ValidatorResult object
public func validate(_ criterias : [Criteriable], forceExit:Bool = false, result:@escaping (ValidatorResult)->Void) {
    //code
}
}

Example of usage:

func textFieldDidEndEditing(_ textField: UITextField) {
    textField.validate([LengthCriteria(4)], result: { result in
        switch result {
            case .valid:
                print("All valid")
            case .notValid(let criteria):
                print(criteria.debugErrorString)
            case .notValides(let criterias):
                print("Criterias that fails:")
                _ = criterias.map({ print($0.debugErrorString)
                })
        }
    })
}

How its works

First, you must take needed criteria from the aviable criterias or create custom criteria. All criterias must conform protocol:

protocol Criteriable {
    /// debug string for helps detect problem
    var debugErrorString : String {get}

    /// Check if value conform to criteria
    ///
    /// - Parameter value: value to be checked
    /// - Returns: return true if conform
    func isConform(to value:String) -> Bool
}

Then you can validate string by choosed criterias by calling:

StringValidator([\* array of choosed criterias *\]).isValide("" \* string to must be validate *\, forceExit: false, result: { validator in
        switch validator {
            /// all criterias was passed
            case .valid:
            print("All valid")

            /// first failed criteria
            case .notValid(let criteria):

            /// all failed criterias
            case .notValides(let criterias):
        }
})

Thats all. Your string was validated and you get result.

List of aviable Criterias

struct LengthCriteria : Criteriable { \\code } \\ check string length

struct UppercaseLetterExistCriteria : Criteriable { \\code } \\ check string contains one or more char in Uppercase

struct LowercaseLetterExistCriteria : Criteriable { \\code } \\ check string contains one or more char in Lowercase

struct NumberExistCriteria : Criteriable { \\code } \\ check string exist one or more numer

struct RegexpCriteria : Criteriable { \\code } \\ check string must to RegExp

struct RangeCriteria : Criteriable { \\code } \\ check string length inside range

struct FirstCharIsLetterCriteria : Criteriable { \\code } \\ check first char is letter and optional check if in uppercase

How add custom Criteria

It's easy. Just create struct and conform protocol Criteriable. Example:

struct MyCustomCriteria : Criteriable {
    var debugErrorString: String = debugMessage(MyCustomCriteria.self, message:"some debug message")
    func isConform(to value: String) -> Bool {
        /* some logic for check */
        return false
    }
}

Thats all. Simple easy :)

Author

k.krizhanovskii, k.krizhanovskii@gmail.com

License

KKStatusBarService is available under the MIT license.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.