/*

 Copyright (C) 2018 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Type used to represent error value thrown for invalid Calculator input.

*/

import Foundation

public enum CalculatorError: Error {

    case invalidCharater

    case multipleCharacters

    case nilInput

}

extension CalculatorError: LocalizedError {

    public var errorDescription: String? {

        switch self {

        case .invalidCharater: return NSLocalizedString("Invalid character exception.", comment: "The input is not a number between 0-9, an operator (+, -, *, /), D, C, =, or a period.")

        case .multipleCharacters: return NSLocalizedString("Multiple characters exception.", comment: "The input contains more than one character.")

        case .nilInput: return NSLocalizedString("Nil exception.", comment: "The input is nil.")

        }

    }

}