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1//
2// IntCodingKey.swift
3// URLQueryItemCoder
4//
5// Created by Kyle Hughes on 1/13/23.
6//
7
8/// A basic coding key implementation for integer-indexed collections.
9internal struct IntCodingKey {
10 /// The value to use in an integer-indexed collection (e.g. an int-keyed dictionary).
11 internal let intValue: Int?
12
13 /// The string to use in a named collection (e.g. a string-keyed dictionary).
14 internal let stringValue: String
15
16 // MARK: Private Initialization
17
18 private init(intValue: Int?, stringValue: String) {
19 self.intValue = intValue
20 self.stringValue = stringValue
21 }
22}
23
24// MARK: - CodingKey Extension
25
26extension IntCodingKey: CodingKey {
27 // MARK: Internal Initialization
28
29 /// Creates a new instance from the specified integer.
30 ///
31 /// - Parameter intValue: The integer value of the desired key.
32 internal init(intValue: Int) {
33 self.intValue = intValue
34
35 stringValue = String(intValue)
36 }
37
38 /// Creates a new instance from the given string, converted to an integer.
39 ///
40 /// - Parameter stringValue: The string value of the desired key.
41 /// - Returns: The instance, or `nil` if the string couldn't be converted.
42 internal init?(stringValue: String) {
43 guard let intValue = Int(stringValue) else {
44 return nil
45 }
46
47 self.intValue = intValue
48 self.stringValue = stringValue
49 }
50}
51
52// MARK: - ExpressibleByIntegerLiteral Extension
53
54extension IntCodingKey: ExpressibleByIntegerLiteral {
55 // MARK: Internal Initialization
56
57 /// Creates an instance initialized to the given integer value.
58 ///
59 /// - Parameter integerLiteral: The value of the new instance.
60 @inlinable
61 internal init(integerLiteral value: Int) {
62 self.init(intValue: value)
63 }
64}