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1 Swift Swift

2 対象読者としてはすでにC 言語および Objective-C( あるいは少なくともJava など ) によるプログラミングの経験がある人を想定していますすでに出版されている入門書や雑誌記事ではSwiftの全体像が把握できないと感じている人には特にお勧めですジェネリクスの機能や標準ライブラリに関する解説なども含んでおり現時点では最も濃い Swift 本になっていると思います

4 truefalse Unicode Unicode

5 var ell : Int = 100 let psy : Double = 0.25

6 var t = (10, Ten ) var w: (Int, String) = t let (x, y) = t let (_, z) = w

7 var msg : String? msg = msg = msg = nil var str : String str = msg! if str == nil {

8 var msg : String? if let s = msg { nil coalescing operator let str = msg??

9 func baz(n:int, k:string) -> String func gaz(count n:int, name k:string) gaz(count:8, name: Button ) func kaz(_ n:int, name k:string)

10 func draw(rect:cgrect, color:uicolor) draw(r, color:bgcolor) - (void)drawinrect:(cgrect)rect blendmode:(cgblendmode)blendmode alpha:(cgfloat)alpha func drawinrect(_ rect: CGRect, blendmode blendmode: CGBlendMode, alpha alpha: CGFloat)

11 func psy(inout n:int, k:string) psy(&r, kongloo ) func swap2int(inout a:int, inout b:int) { let t = a; a = b; b = t

char *fgets(char *str, int size, FILE *stream); func fgets(_: UnsafeMutablePointer<Int8>, _: Int32, _: UnsafeMutablePointer<FILE>) -> UnsafeMutablePointer<Int8> import

12 char *fgets(char *str, int size, FILE *stream); func fgets(_: UnsafeMutablePointer<Int8>, _: Int32, _: UnsafeMutablePointer<FILE>) -> UnsafeMutablePointer<Int8> import Foundation var buf = [Int8](count: 100, repeatedvalue: 0) while fgets(&buf, 100, stdin)!= nil { let n = strlen(buf) if n > 0 && buf[n - 1] == 0x0a { buf[n - 1] = 0 // puts(buf)

13 char *fgets(char *str, int size, FILE *stream); int puts(const char *s); size_t strlen(const char *s); func fgets(_: UnsafeMutablePointer<Int8>, _: Int32, _: UnsafeMutablePointer<FILE>) -> UnsafeMutablePointer<Int8> func puts(_: UnsafePointer<Int8>) -> Int32 func strlen(_: UnsafePointer<Int8>) -> UInt

16 1/1 1/3 2/3 1/1 1/1 1/2 1/2 1/1 2/2

18 (1) class CharSet { var entry: [Character:Int] var total = 0 init() { entry = [:] total = 0 init(_ c: Character) { entry = [c:1]; total = 1 func inc(key:character) { if entry[key]?++ == nil { entry[key] = 1 total++ //

19 (2) // func randchar() -> Character { if entry.count == 1 { for (ch, _) in entry { return ch let rnd = Int(random() % total) var sum = 0 for (c, v) in entry { sum += v if sum > rnd { return c return " " // never

20 func readfile(path:string) -> NSString? { var err: NSError? = nil var cont = NSString(contentsOfFile:path, encoding:nsutf8stringencoding, error: &err) // if cont == nil { println( err?.localizeddescription?? "") return cont Objective-C Swift - (instancetype)initwithcontentsoffile:(nsstring *)path encoding:(nsstringencoding)enc error:(nserror **)error convenience init?(contentsoffile path: String, encoding enc: UInt, error error: NSErrorPointer)

(1) var maxlen: Int = 3 class RandomChat { var dic: [String:CharSet] = [:] var startchars : CharSet init() { startchars = CharSet() // func makemodel(str: String) { var chseq = [String]() var pttn =

21 (1) var maxlen: Int = 3 class RandomChat { var dic: [String:CharSet] = [:] var startchars : CharSet init() { startchars = CharSet() // func makemodel(str: String) { var chseq = [String]() var pttn = "" for ch in str { // if ch <= Character(" ") { continue if pttn == "" { if ch == Character("") { continue startchars.inc(ch) else { if let cset = dic[pttn] { cset.inc(ch) else { dic[pttn] = CharSet(ch) if ch == "" ch == "" { pttn = ""; chseq = [] else { chseq.append(string(ch)) if chseq.count >= maxlen { chseq.removeatindex(0) pttn = join("", chseq)

22 (2) // func makestatment() -> String { var pttn = String(startChars.randChar()) var chseq = [pttn] var strbuf = pttn while let cset = dic[pttn] { let ch = cset.randchar() let s = String(ch) strbuf += s if s == "" s == "" { break chseq.append(s) if chseq.count >= maxlen { chseq.removeatindex(0) pttn = join("", chseq) return strbuf

23 var C_ARGC: CInt var C_ARGV: UnsafeMutablePointer<UnsafeMutablePointer<Int8>> for var i = 0; i < Int(C_ARGC); i++ { if let s = String.fromCString(C_ARGV[i]) { println("\(i): \"\(s)\"") $ swift comm.swift -help "(^ ^;" 0: "comm.swift" 1: "-help" 2: "(^ ^;" $ swiftc comm.swift $./comm -magic=10 -flag=no 100 0: "./comm" 1: "-magic=10" 2: "-flag=no" 3: "100"

24 chats.swift func readfile class CharSet class RandomChat srandom(uint32(time(nil))) maxlen = 5 var chat = RandomChat() $ swift chats.swift $ swiftc chats.swift $./chats for var i = 1; i < Int(C_ARGC); i++ { if let s = String.fromCString(C_ARGV[i]) { if let text = readfile(s) { chat.makemodel(text) for _ in 0..< 10 { println(chat.makestatment())

25 class CharSet class RandomChat func readfile main CharSet.swift RandomChat.swift main.swift $ swiftc -o chats main.swift CharSet.swift RandomChat.swift $./chats

mstrcpy char mstrcpy(const char src); mstrcpy malloc (main free ) stdio.h fgets char fgets(char s, int size, FILE *stream); s size ( )

2008 3 10 1 mstrcpy char *mstrcpy(const char *src); mstrcpy malloc (main free ) stdio.h fgets char *fgets(char *s, int size, FILE *stream); s size ( ) stream FILE ( man ) 40 ( ) %./a.out String : test