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Merge pull request mapbox#250 from mapbox/maxspeeds
Serialize speed limit annotations
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| import Foundation | ||
|
|
||
| enum SpeedLimitDescriptor: Equatable { | ||
| enum UnitDescriptor: String, Codable { | ||
| case milesPerHour = "mph" | ||
| case kilometersPerHour = "km/h" | ||
|
|
||
| init?(unit: UnitSpeed) { | ||
| switch unit { | ||
| case .milesPerHour: | ||
| self = .milesPerHour | ||
| case .kilometersPerHour: | ||
| self = .kilometersPerHour | ||
| default: | ||
| return nil | ||
| } | ||
| } | ||
|
|
||
| var describedUnit: UnitSpeed { | ||
| switch self { | ||
| case .milesPerHour: | ||
| return .milesPerHour | ||
| case .kilometersPerHour: | ||
| return .kilometersPerHour | ||
| } | ||
| } | ||
| } | ||
|
|
||
| enum CodingKeys: String, CodingKey { | ||
| case none | ||
| case speed | ||
| case unknown | ||
| case unit | ||
| } | ||
|
|
||
| case none | ||
| case some(speed: Measurement<UnitSpeed>) | ||
| case unknown | ||
|
|
||
| init(speed: Measurement<UnitSpeed>?) { | ||
| guard let speed = speed else { | ||
| self = .unknown | ||
| return | ||
| } | ||
|
|
||
| if speed.value.isInfinite { | ||
| self = .none | ||
| } else { | ||
| self = .some(speed: speed) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension SpeedLimitDescriptor: Codable { | ||
| init(from decoder: Decoder) throws { | ||
| let container = try decoder.container(keyedBy: CodingKeys.self) | ||
|
|
||
| if (try container.decodeIfPresent(Bool.self, forKey: .none)) ?? false { | ||
| self = .none | ||
| } else if (try container.decodeIfPresent(Bool.self, forKey: .unknown)) ?? false { | ||
| self = .unknown | ||
| } else { | ||
| let unitDescriptor = try container.decode(UnitDescriptor.self, forKey: .unit) | ||
| let unit = unitDescriptor.describedUnit | ||
| let value = try container.decode(Double.self, forKey: .speed) | ||
| self = .some(speed: .init(value: value, unit: unit)) | ||
| } | ||
| } | ||
|
|
||
| func encode(to encoder: Encoder) throws { | ||
| var container = encoder.container(keyedBy: CodingKeys.self) | ||
|
|
||
| switch self { | ||
| case .none: | ||
| try container.encode(true, forKey: .none) | ||
| case .some(var speed): | ||
| let unitDescriptor = UnitDescriptor(unit: speed.unit) ?? { | ||
| speed = speed.converted(to: .kilometersPerHour) | ||
| return .kilometersPerHour | ||
| }() | ||
| try container.encode(unitDescriptor, forKey: .unit) | ||
| try container.encode(speed.value, forKey: .speed) | ||
| case .unknown: | ||
| try container.encode(true, forKey: .unknown) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| extension Measurement where UnitType == UnitSpeed { | ||
| init?(speedLimitDescriptor: SpeedLimitDescriptor) { | ||
| switch speedLimitDescriptor { | ||
| case .none: | ||
| self = .init(value: .infinity, unit: .kilometersPerHour) | ||
| case .some(let speed): | ||
| self = speed | ||
| case .unknown: | ||
| return nil | ||
| } | ||
| } | ||
| } |
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