//
// ColorCode+Hex.swift
// Badgy
//
// MIT License
//
// Copyright (c) 2020 Arthur Alves
//
// 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.

import Foundation

extension ColorCode {
    /// Checks whether the `input` matches the valid color formats
    ///
    /// Valid colors formats are `#rrggbb` | `#rrggbbaa`
    static func isHexColor(_ hex: String) -> Bool {
        NSRegularExpression.hexColorCode.matches(hex)
    }
}

private extension NSRegularExpression {
    /// Regular expression that matches '#rrggbb' and '#rrggbbaa' formats
    ///
    /// Additional explanation at [regex101](https://regex101.com/r/j0MDnb/1/tests)
    static let hexColorCode = NSRegularExpression("^#(?:[0-9a-fA-F]{2}){3,4}$")
}
