開発環境
- OS X Mavericks - Apple(OS)
- Xcode 6.0 Beta
- Swift (プログラミング言語)
Head First C ―頭とからだで覚えるCの基本(David Griffiths (著)、Dawn Griffiths (著) 中田 秀基(監訳)(翻訳)、木下 哲也 (翻訳)、オライリージャパン)の3章(小さなツールの作成: 1つのことだけどうまくやる)、自分で考えてみよう(p.139)をSwiftで考えてみる。
自分で考えてみよう(p.139)
コード(Xcode)
string.swift
//
// string.swift
// string
//
// Created by kamimura on 8/10/14.
// Copyright (c) 2014 kamimura. All rights reserved.
//
import Foundation
extension String {
var swapcaseString:String {
var result: String = ""
for ch in self {
let s = String(ch)
result += s.uppercaseString == s ? s.lowercaseString : s.uppercaseString
}
return result
}
var isUpper:Bool { return self.uppercaseString == self }
var isLower:Bool { return self.lowercaseString == self }
var length:Int { return (self as NSString).length }
var strip:String { return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())}
var floatValue:Float { return (self as NSString).floatValue }
var doubleValue:Double { return (self as NSString).doubleValue }
func count(sub:String) -> Int {
var result:Int = 0
var s = self
let index:String.Index = "a".endIndex
while s != "" {
if s.hasPrefix(sub) {
result += 1
s = s.substringFromIndex(sub.endIndex)
} else {
s = s.substringFromIndex(index)
}
}
return result
}
func find(sub:String, start:Int = 0, end:Int? = nil) -> Int {
var s = self as NSString
var s_temp = s.substringFromIndex(start)
let end_temp:Int = end ? end! : s.length
for i in start..<end_temp {
if (s_temp.hasPrefix(sub)) {
return i
}
s_temp = s.substringFromIndex(i + 1) as NSString
}
return -1
}
func replace(old_str:String, new_str:String) -> String {
return self.stringByReplacingOccurrencesOfString(old_str, withString: new_str)
}
func slice(start:Int=0, end:Int?=nil) -> String {
let s = self as NSString
var new_end:Int
if (end) {
new_end = end!
} else {
new_end = s.length
}
return s.substringWithRange(NSRange(location: start, length:new_end - start))
}
func split(sep:String = "") -> [String] {
var result:[String] = []
if (sep == "") {
for ch in self {
result.append(String(ch))
}
return result
}
var s:String = self
var len = sep.length
var temp:String = ""
while s != "" {
if s.hasPrefix(sep) {
if temp != "" {
result.append(temp)
temp = ""
}
s = s.slice(start: len)
} else {
temp += s.slice(start: 0, end: 1)
s = s.slice(start: 1)
}
}
if temp != "" {
result.append(temp)
}
return result
}
var reversed:String { return "".join(self.split().reverse()) }
}
main.swift
//
// main.swift
// sample139
//
// Created by kamimura on 8/20/14.
// Copyright (c) 2014 kamimura. All rights reserved.
//
import Foundation
let in_fh = String.stringWithContentsOfFile("spooky.csv")
let file1 = "ufos.csv"
let file2 = "disappearances.csv"
let file3 = "others.csv"
// append modeで書き込む方法がなかなか見つからなかったからとりあえず文字列を作成してから書き込むことに(効率よくないかも…)
var result1 = ""
var result2 = ""
var result3 = ""
for line in in_fh!.split(sep: "\n") {
let new_line = line.strip + "\n"
if line.find("UFO") != -1 {
result1 += new_line
} else if line.find("Disappearance") != -1 {
result2 += new_line
} else {
result3 += new_line
}
}
result1.writeToFile(file1, atomically: true, encoding: NSUTF8StringEncoding, error: nil)
result2.writeToFile(file2, atomically: true, encoding: NSUTF8StringEncoding, error: nil)
result3.writeToFile(file3, atomically: true, encoding: NSUTF8StringEncoding, error: nil)
入出力結果(Console Output, Terminal)
$ cat spooky.csv 30.685163,-68.137207,Type=Yeti -100.0, 50,Type=Test1 28.304380,-74.575195,Type=UFO 29.132971,-71.136475,Type=Ship 28.343065,-62.753906,Type=Elvis 27.868217,-68.005371,Type=Goatsucker 30.496017,-73.333740,Type=Disappearance 26.224447,-71.477051,Type=UFO 29.401320,-66.027832,Type=Ship 37.879536,-69.477539,Type=Elvis 22.705256,-68.192139,Type=Elvis 27.166695,-87.484131,Type=Elvis 50,200,Type=Test2 $ ./sample139 $ cat ufos.csv 28.304380,-74.575195,Type=UFO 26.224447,-71.477051,Type=UFO $ cat disappearances.csv 30.496017,-73.333740,Type=Disappearance $ cat others.csv 30.685163,-68.137207,Type=Yeti -100.0, 50,Type=Test1 29.132971,-71.136475,Type=Ship 28.343065,-62.753906,Type=Elvis 27.868217,-68.005371,Type=Goatsucker 29.401320,-66.027832,Type=Ship 37.879536,-69.477539,Type=Elvis 22.705256,-68.192139,Type=Elvis 27.166695,-87.484131,Type=Elvis 50,200,Type=Test2 $ cat spooky.csv 30.685163,-68.137207,Type=Yeti -100.0, 50,Type=Test1 28.304380,-74.575195,Type=UFO 29.132971,-71.136475,Type=Ship 28.343065,-62.753906,Type=Elvis 27.868217,-68.005371,Type=Goatsucker 30.496017,-73.333740,Type=Disappearance 26.224447,-71.477051,Type=UFO 29.401320,-66.027832,Type=Ship 37.879536,-69.477539,Type=Elvis 22.705256,-68.192139,Type=Elvis 27.166695,-87.484131,Type=Elvis 50,200,Type=Test2 $
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