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Cleanup

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This commit is contained in:
Max Nuding 2021-12-16 18:55:25 +01:00
parent 7326d17948
commit 632868f7f3
Signed by: phlaym
GPG Key ID: A06651BAB6777237
1 changed files with 33 additions and 37 deletions
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70
Sources/16/16.swift
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@ -76,18 +76,18 @@ class Day16: Runnable {
let input = try! String(contentsOfFile: inputPath)
let parts = input
.trimmingCharacters(in: .newlines)
let bytes = parts.ToBinary().joined()
let bytes = parts.bits().joined()
let packets = parsePacket(bytes: bytes)
let p: Packet = packets.0
print(p.getTotalVersion())
print(p.getValue())
}
func parsePacket(bytes: String) -> (Packet, String) {
let version = bytes[bytes.startIndex..<bytes.index(bytes.startIndex, offsetBy: 3)].description.binaryToDecimal()
let typeId = bytes[bytes.index(bytes.startIndex, offsetBy: 3)..<bytes.index(bytes.startIndex, offsetBy: 6)].description.binaryToDecimal()
func parsePacket<S>(bytes: S) -> (Packet, S.SubSequence) where S:StringProtocol {
let version = bytes[bytes.startIndex..<bytes.index(bytes.startIndex, offsetBy: 3)].binaryToDecimal()
let typeId = bytes[bytes.index(bytes.startIndex, offsetBy: 3)..<bytes.index(bytes.startIndex, offsetBy: 6)].binaryToDecimal()
var value: Packet
var reminder: String
var reminder: S.SubSequence
switch typeId {
case 4:
let (v, r) = parseLiteralPacketValue(bytes: bytes)
@ -101,17 +101,17 @@ class Day16: Runnable {
return (value, reminder)
}
func parseOperatorPacker(bytes: String) -> ([Packet], String) {
func parseOperatorPacker<S>(bytes: S) -> ([Packet], S.SubSequence) where S:StringProtocol {
let startNextBitsIndex = bytes.index(bytes.startIndex, offsetBy: 7)
let lengthTypeId = bytes[bytes.index(bytes.startIndex, offsetBy: 6)..<startNextBitsIndex].description
let isTotalLength = lengthTypeId == "0"
let nextBitsLength = isTotalLength ? 15 : 11
let endNextBitsIndex = bytes.index(startNextBitsIndex, offsetBy: nextBitsLength)
let nextBits = bytes[startNextBitsIndex..<endNextBitsIndex].description
let nextBits = bytes[startNextBitsIndex..<endNextBitsIndex]
var number = nextBits.binaryToDecimal()
var reminder = bytes[endNextBitsIndex...].description
var reminder = bytes[endNextBitsIndex...]
var subPackets = [Packet]()
while number > 0 {
@ -123,17 +123,17 @@ class Day16: Runnable {
return (subPackets, reminder)
}
func parseLiteralPacketValue(bytes: String) -> (Int, String) {
func parseLiteralPacketValue<S>(bytes: S) -> (Int, S.SubSequence) where S:StringProtocol {
var index = bytes.index(bytes.startIndex, offsetBy: 6)
var ei = index
var bits = ""
var reminder = ""
var bits: Substring = ""
var reminder: S.SubSequence = ""
while true {
let si = bytes.index(index, offsetBy: 1)
ei = bytes.index(si, offsetBy: 4)
bits += bytes[si..<ei].description
bits += bytes[si..<ei]
if bytes[index] == "0" {
reminder = bytes[ei...].description
reminder = bytes[ei...]
break
}
index = bytes.index(ei, offsetBy: 0)
@ -142,52 +142,48 @@ class Day16: Runnable {
}
}
extension String {
func ToBinary() -> [String] {
extension StringProtocol {
func bits() -> [String] {
self.map { $0.bits }
}
func binaryToDecimal() -> Int {
self.reversed().enumerated().reduce(0, { p, cur in
p + (cur.element == "0" ? 0 : Int(pow(2.0, Double(cur.offset))))
})
}
func binaryToDecimal() -> Int { Int(self, radix: 2)! }
}
extension Character {
var bits: String {
switch self {
case "0":
switch self.hexDigitValue! {
case 0:
return "0000"
case "1":
case 1:
return "0001"
case "2":
case 2:
return "0010"
case "3":
case 3:
return "0011"
case "4":
case 4:
return "0100"
case "5":
case 5:
return "0101"
case "6":
case 6:
return "0110"
case "7":
case 7:
return "0111"
case "8":
case 8:
return "1000"
case "9":
case 9:
return "1001"
case "A":
case 10:
return "1010"
case "B":
case 11:
return "1011"
case "C":
case 12:
return "1100"
case "D":
case 13:
return "1101"
case "E":
case 14:
return "1110"
case "F":
case 15:
return "1111"
default:
fatalError()