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2020/day4/main.swift

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+import Foundation
+
+let input = loadData(day: 4)
+
+let scanner = Scanner(string: input)
+scanner.charactersToBeSkipped = nil
+
+extension Scanner {
+    func field() -> (String, String)? {
+        guard let name = scanUpToString(":"),
+              scanString(":") != nil,
+              let value = scanUpToCharacters(from: .whitespacesAndNewlines)
+        else { return nil }
+        return (name, value)
+    }
+
+    func passport() -> [String: String]? {
+        var fields = [(String, String)]()
+        while !isAtEnd && scanString("\n\n") == nil {
+            _ = scanner.scanCharacters(from: .whitespacesAndNewlines)
+            guard let field = field() else { return nil }
+            fields.append(field)
+        }
+        return try? Dictionary(fields, uniquingKeysWith: { _, _ in throw NSError(domain: "error", code: 1, userInfo: nil) })
+    }
+}
+
+var valids = 0
+var valid2 = 0
+
+let requiredFields = [
+    "byr",
+    "iyr",
+    "eyr",
+    "hgt",
+    "hcl",
+    "ecl",
+    "pid",
+]
+
+func validHeight(_ height: String) -> Bool {
+    let scanner = Scanner(string: height)
+    guard let number = scanner.scanInt() else { return false }
+    if scanner.scanString("cm") != nil, 150...193 ~=  number {
+        return true
+    }
+
+    if scanner.scanString("in") != nil, 59...76 ~= number {
+        return true
+    }
+
+    return false
+}
+
+func validHairColor(_ hcl: String) -> Bool {
+    let scanner = Scanner(string: hcl)
+    guard scanner.scanString("#") != nil else { return false }
+    guard scanner.scanCharacters(from: CharacterSet(charactersIn: "0123456789abcdef"))?.count == 6 else { return false }
+    return scanner.isAtEnd
+}
+
+let validEyeColors: Set<String> = [
+    "amb",
+    "blu",
+    "brn",
+    "gry",
+    "grn",
+    "hzl",
+    "oth"
+]
+
+func isValidPassportId(_ pid: String) -> Bool {
+    return pid.count == 9 && Int(pid) != nil
+}
+
+while !scanner.isAtEnd {
+    guard let passport = scanner.passport() else { fatalError() }
+    print(passport)
+
+    let valid = requiredFields.allSatisfy { passport.keys.contains($0) }
+    if valid {
+        valids += 1
+    }
+
+    guard let year = passport["byr"].flatMap(Int.init), 1920...2002 ~= year else { continue }
+    guard let issueYear = passport["iyr"].flatMap(Int.init), 2010...2020 ~= issueYear else { continue }
+    guard let expireYear = passport["eyr"].flatMap(Int.init), 2020...2030 ~= expireYear else { continue }
+    guard let height = passport["hgt"], validHeight(height) else { continue }
+    guard let hairColor = passport["hcl"], validHairColor(hairColor) else { continue }
+    guard let eyeColor = passport["ecl"], validEyeColors.contains(eyeColor) else { continue }
+    guard let pid = passport["pid"], isValidPassportId(pid) else { continue }
+
+    valid2 += 1
+
+}
+
+print("valids", valids)
+print("valid2", valid2)
+