Swift: Text から Dictionary に変換

プログラム

text_read.swift

// --------------------------------------------------------------------
//	  text_read.swift
//
//									  Oct/29/2024
//
// --------------------------------------------------------------------
import Foundation

// --------------------------------------------------------------------
func textReadProc(fileIn: String) -> [String:[String:Any]] {
	var dict = [String: [String: Any]]()
	
	let fpIn = try! String(contentsOfFile: fileIn, encoding: .utf8)
	let lines = fpIn.components(separatedBy: .newlines)
	
	for line in lines {
		let cols = line.trimmingCharacters(in: .whitespacesAndNewlines).components(separatedBy: "\t")
		if cols.count >= 4, cols[0].hasPrefix("t") {
			if let population = Int(cols[2]) {
				dict[cols[0]] = ["name": cols[1], "population": population, "date_mod": cols[3]]
			} else {
				print("*** error *** \(fileIn) ***")
				print("*** \(line) ***")
			}
		}
	}
	
	return dict
}

// --------------------------------------------------------------------
func dictDisplayProc(dict: [String:[String:Any]]) {
	for (key, value) in dict.sorted(by: { $0.key < $1.key }) {
		let name = value["name"]!
		let population = value["population"]!
		let dateMod = value["date_mod"]!
		print("\(key)\t\(name)\t\(population)\t\(dateMod)")
	}
}

// --------------------------------------------------------------------
print("*** 開始 ***")

guard CommandLine.arguments.count > 1 else {
	print("入力ファイル名を指定してください")
	exit(1)
}

let fileIn = CommandLine.arguments[1]

let dict = textReadProc(fileIn: fileIn)
dictDisplayProc(dict: dict)

print("*** 終了 ***")
// --------------------------------------------------------------------

実行コマンド

swift text_read.swift cities.txt

確認したバージョン

$ swift --version
Swift version 6.0.1 (swift-6.0.1-RELEASE)
Target: x86_64-unknown-linux-gnu