kitasuke

import Foundation

@_functionBuilder
struct ContentListBuilder {

    static func buildBlock() -> ContentList {
        return EmptyContentList()
    }
    
    static func buildBlock(_ list: ContentList) -> ContentList {

kitasuke

Swift 5.1へのStringLiteralExprの改善

こんにちは。iOSエンジニアの@kitasukeです。

今回は、Swift Compilerのパーサー内部でlibSyntaxが作成する、StringLiteralExprに関する改善を行ったので、その内容を簡単に紹介します。
ちなみに、この変更はlibSyntax内での変更でありSwiftのString APIへの変更ではありません。

概要

libSyntaxには、Stringリテラル用にStringLiteralExprとStringInterpolationExprの2種類のシンタックスが定義されています。

kitasuke

sil_stage canonical

import Builtin
import Swift
import SwiftShims

// main
sil @main : $@convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
bb0(%0 : $Int32, %1 : $UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>):
  %2 = integer_literal $Builtin.Int32, 0          // user: %3

kitasuke

sil_stage canonical

import Builtin
import Swift
import SwiftShims

// main
sil @main : $@convention(c) (Int32, UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>) -> Int32 {
bb0(%0 : $Int32, %1 : $UnsafeMutablePointer<Optional<UnsafeMutablePointer<Int8>>>):
  %2 = integer_literal $Builtin.Int32, 0          // user: %3

kitasuke

import Foundation
import RxSwift
import FBSDKCoreKit
import FBSDKLoginKit

enum FacebookSDKError: Error {
    case tokenNotFound
}

extension Reactive where Base: FBSDKLoginManager {

kitasuke

import UIKit
import RxSwift
import RxCocoa

extension Reactive where Base: UITableView {
    func items<S: Sequence, Cell: UITableViewCell, O: ObservableType>
        (cellType: Cell.Type)
        -> (_ source: O)
        -> (_ configureCell: @escaping (Int, S.Iterator.Element, Cell) -> Void)
        -> Disposable

kitasuke

Type-safe API call with Protocol Buffers in Swift

Apple recently open sourced swift-protobuf which is a plugin of Protocol Buffers for swift language. Protocol Buffers in Swift enables us to have type safety, make API faster and unify schema documentation of structured data. I had a chance to use swift-protobuf in my project and thought that there are many benefits for us, so I would like to share my thoughts.

I also created a repository which has sample server/client app with Protocol Buffers. Please take a look here if you're interested in what implementation looks like.

What's Protocol Buffers?

kitasuke

import Foundation
import APIKit

protocol ProtobufRequest: Request {}

extension ProtobufRequest {
    var dataParser: DataParser {
        return ProtobufDataParser()
    }
}

kitasuke

import UIKit

extension UICollectionView {
    func registerNib<T: UICollectionViewCell>(forCellType type: T.Type) {
        let name = String(describing: type)
        let nib = UINib(nibName: name, bundle: nil)
        register(nib, forCellWithReuseIdentifier: name)
    }
    
    func registerNib<T: UIView>(forSupplementaryViewOfKind elementKind: String, withType type: T.Type) {

kitasuke

import UIKit

extension UITableView {
    func registerNib<T: UITableViewCell>(forCellType type: T.Type) {
        let name = String(describing: type)
        let nib = UINib(nibName: name, bundle: nil)
        register(nib, forCellReuseIdentifier: name)
    }
    
    func registerNib<T: UIView>(forHeaderFooterType type: T.Type) {