//

// String+Ordinals.swift

// ShapeScript Lib

//

// Created by Nick Lockwood on 09/09/2021.

// Copyright © 2021 Nick Lockwood. All rights reserved.

//

extension String {

var isOrdinal: Bool {

ordinalIndex != nil

}

var ordinalIndex: Int? {

indicesByOrdinal[lowercased()]

}

static let ordinals: [String] = {

let ordinalsToNinth = [

"first", "second", "third", "fourth", "fifth",

"sixth", "seventh", "eighth", "ninth",

]

var result = ordinalsToNinth + [

"tenth",

"eleventh", "twelfth", "thirteenth", "fourteenth", "fifteenth",

"sixteenth", "seventeenth", "eighteenth", "nineteenth",

]

result += ["twentieth"] + ordinalsToNinth.map { "twenty\($0)" }

result += ["thirtieth"] + ordinalsToNinth.map { "thirty\($0)" }

result += ["fortieth"] + ordinalsToNinth.map { "forty\($0)" }

result += ["fiftieth"] + ordinalsToNinth.map { "fifty\($0)" }

result += ["sixtieth"] + ordinalsToNinth.map { "sixty\($0)" }

result += ["seventieth"] + ordinalsToNinth.map { "seventy\($0)" }

result += ["eightieth"] + ordinalsToNinth.map { "eighty\($0)" }

result += ["ninetieth"] + ordinalsToNinth.map { "ninety\($0)" }

return result

}()

static func ordinals(upTo value: Int) -> ArraySlice<String> {

ordinals.prefix(value)

}

}

private let indicesByOrdinal: [String: Int] = Dictionary(

uniqueKeysWithValues: String.ordinals.enumerated().map { ($1, $0) }

)