SwiftでAtCoderに挑戦するためのPlayground用テンプレート

AtCoderTemplate.swift

import Foundation

struct Example {
    let input: String
    let expectation: String
}
// テストケース列挙
let examples: [(String, Example)] = [
    ("1", Example(
        input: """
1 1
""",
        expectation: """
Odd
""")),
    ("2", Example(
        input: """
1 2
""",
        expectation: """
Even
""")),
    ("3", Example(
        input: """
2 1
""",
        expectation: """
EvenEven
""")),
    ("4", Example(
        input: """
2 2
""",
        expectation: """
Even
""")),
]
// ----- この関数内が提出コードになる -----
func run(readLine: () -> String?, print: (Any...) -> Void) {
    // utils
    func readInts() -> [Int] { readLine()!.split(separator: " ").map{Int($0)!} }
    func readInt1() -> Int { Int(readLine()!)! }
    func readInt2() -> (Int, Int) { let ps = readLine()!.split(separator:" ").map{Int($0)!}; return (ps[0], ps[1]) }
    func readInt3() -> (Int, Int, Int) { let ps = readLine()!.split(separator:" ").map{Int($0)!}; return (ps[0], ps[1], ps[2]) }

    // code
    let (a, b) = readInt2()
    print(a.isMultiple(of: 2) || b.isMultiple(of: 2) ? "Even" : "Odd")
}

func main(label: String, example: Example) {
    // boilerplates
    var inputLines = example.input.split(separator: "\n")
    var outputLines: [String] = []
    defer {
        var expectedLines = example.expectation
            .split(separator: "\n")
            .map(String.init)
        let isSucceeded = expectedLines == outputLines
        Swift.print("== Test[\(label)] =========")
        Swift.print(isSucceeded ? "succeeded." : "failed.")
        if !isSucceeded {
            Swift.print("expected | actual")
            while !outputLines.isEmpty && !expectedLines.isEmpty {
                let o = outputLines.remove(at: 0)
                let e = expectedLines.remove(at: 0)
                Swift.print("\(o == e ? " " : "!") \(e) | \(o)")
            }
        }
        Swift.print("")
    }
    run(
        readLine: { String(inputLines.remove(at: 0)) },
        print: { outputLines.append($0.map {"\($0)"}.joined(separator: " ")) }
    )
}

examples.forEach {
    main(label: $0.0, example: $0.1)
}

PlaygroundでRunされたとき、print結果とexpected文字列の比較を行うテストが走り、以下のようなレポートが得られる
! がついているのが間違えている行

== Test[1] =========
succeeded.

== Test[2] =========
succeeded.

== Test[3] =========
failed.
expected | actual
! EvenEven | Even

== Test[4] =========
succeeded.