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1//
2// NonConformingFloatEncodingStrategy.swift
3// URLQueryItemCoder
4//
5// Created by Kyle Hughes on 3/17/23.
6//
7
8/// The strategy to use for non-conforming floating-point values (IEEE 754 infinity and NaN).
9public enum NonConformingFloatEncodingStrategy {
10 /// Encode the values using the given representation strings.
11 case convertToString(positiveInfinity: String, negativeInfinity: String, nan: String)
12
13 /// Throw upon encountering non-conforming values. This is the default strategy.
14 case `throw`
15
16 // MARK: Public Static Interface
17
18 /// The default encoding strategy.
19 ///
20 /// Equals `.throw`.
21 public static let `default`: Self = .throw
22
23 // MARK: Internal Instance Interface
24
25 internal func encode<F>(
26 _ float: F,
27 at codingPath: [any CodingKey],
28 using configuration: EncodingStrategies
29 ) throws -> EncodingPrimitiveValue where F: CustomStringConvertible & FloatingPoint {
30 guard !float.isNaN, !float.isInfinite else {
31 switch self {
32 case let .convertToString(posInf, negInf, nan):
33 return .string(
34 {
35 switch float {
36 case .infinity:
37 return posInf
38 case -.infinity:
39 return negInf
40 default:
41 return nan
42 }
43 }()
44 )
45 case .throw:
46 throw EncodingError.invalidValue(
47 float,
48 EncodingError.Context(
49 codingPath: codingPath,
50 debugDescription: "Unable to encode \(F.self).\(float) directly."
51 )
52 )
53 }
54 }
55
56 var string = float.description
57
58 if string.hasSuffix(".0") {
59 string.removeLast(2)
60 }
61
62 return .string(string)
63 }
64}