✨ Add GeoJSON

.swiftpm/xcode/xcshareddata/xcschemes/swift-geo-Package.xcscheme

@@ -202,6 +202,20 @@
                ReferencedContainer = "container:">
             </BuildableReference>
          </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "GeoJSON"
+               BuildableName = "GeoJSON"
+               BlueprintName = "GeoJSON"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
       </BuildActionEntries>
    </BuildAction>
    <TestAction
@@ -310,6 +324,16 @@
                ReferencedContainer = "container:">
             </BuildableReference>
          </TestableReference>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "GeoJSONTests"
+               BuildableName = "GeoJSONTests"
+               BlueprintName = "GeoJSONTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
       </Testables>
    </TestAction>
    <LaunchAction

Package.swift

@@ -17,6 +17,7 @@ let package = Package(
 		.library(name: "WGS84", targets: ["WGS84"]),
 		.library(name: "GeodeticGeometry", targets: ["GeodeticGeometry"]),
 		.library(name: "Turf", targets: ["Turf"]),
+		.library(name: "GeoJSON", targets: ["GeoJSON"]),
 	],
 	dependencies: [
 		.package(url: "https://github.com/apple/swift-algorithms", .upToNextMajor(from: "1.0.0")),
@@ -137,5 +138,19 @@ let package = Package(
 			"GeodeticConversions",
 			"WGS84Conversions",
 		]),
+
+		// 📄 GeoJSON representation
+		.target(
+			name: "GeoJSON",
+			dependencies: [
+				.target(name: "GeodeticGeometry"),
+				.target(name: "WGS84Turf"),
+				.product(name: "NonEmpty", package: "swift-nonempty"),
+			]
+		),
+		.testTarget(
+			name: "GeoJSONTests",
+			dependencies: ["GeoJSON"]
+		),
 	]
 )

Sources/GeoJSON/BoundingBox.swift

@@ -0,0 +1,61 @@
+//
+//  BoundingBox.swift
+//  GeoSwift
+//
+//  Created by Rémi Bardon on 04/02/2022.
+//  Copyright © 2022 Rémi Bardon. All rights reserved.
+//
+
+import GeoModels
+
+/// A [GeoJSON Bounding Box](https://datatracker.ietf.org/doc/html/rfc7946#section-5).
+public protocol BoundingBox: GeoModels.BoundingBox, Codable {
+
+	/// This bonding box, but type-erased.
+	var asAny: AnyBoundingBox { get }
+
+}
+
+/// A two-dimensional ``BoundingBox``.
+public typealias BoundingBox2D = GeoModels.BoundingBox2D
+
+extension BoundingBox2D: BoundingBox {
+
+	public var asAny: AnyBoundingBox { .twoDimensions(self) }
+
+}
+
+/// A three-dimensional ``BoundingBox``.
+public typealias BoundingBox3D = GeoModels.BoundingBox3D
+
+extension BoundingBox3D: BoundingBox {
+
+	public var asAny: AnyBoundingBox { .threeDimensions(self) }
+
+}
+
+/// A type-erased ``BoundingBox``.
+public enum AnyBoundingBox: BoundingBox, Hashable, Codable {
+
+	public static var zero: AnyBoundingBox = .twoDimensions(.zero)
+
+	public func union(_ other: AnyBoundingBox) -> AnyBoundingBox {
+		switch (self, other) {
+		case let (.twoDimensions(self), .twoDimensions(other)):
+			return .twoDimensions(self.union(other))
+
+		case let (.twoDimensions(bbox2d), .threeDimensions(bbox3d)),
+			 let (.threeDimensions(bbox3d), .twoDimensions(bbox2d)):
+			return .threeDimensions(bbox3d.union(bbox2d))
+
+		case let (.threeDimensions(self), .threeDimensions(other)):
+			return .threeDimensions(self.union(other))
+		}
+	}
+
+	case twoDimensions(BoundingBox2D)
+	case threeDimensions(BoundingBox3D)
+
+	public var asAny: AnyBoundingBox { self }
+
+}

Sources/GeoJSON/Errors.swift

@@ -0,0 +1,17 @@
+//
+//  Errors.swift
+//  SwiftGeo
+//
+//  Created by Rémi Bardon on 07/02/2022.
+//  Copyright © 2022 Rémi Bardon. All rights reserved.
+//
+
+import Foundation
+
+/// Error when creating ``LinearRingCoordinates``.
+///
+/// See [RFC 7946, section 3.1.6](https://datatracker.ietf.org/doc/html/rfc7946#section-3.1.6).
+public enum LinearRingError: Error {
+	case firstAndLastPositionsShouldBeEquivalent
+	case notEnoughPoints
+}