Create PBXProj class from the Data reprentation of a pbxproj file (…

…#798)

Resolves #793

- Add the ability to instantiate `PBXProj` from `Data` representation
- This complements #787 where projects can now be serialised to `Data` representation rather than to disk

Notes:

- `PBXProj.name` isn't serialised as part of the serialised data representation and will need to be manually updated

Sources/XcodeProj/Errors/Errors.swift

@@ -183,6 +183,7 @@ enum PBXProjError: Error, CustomStringConvertible, Equatable {
     case pathIsAbsolute(Path)
     case multipleLocalPackages(productName: String)
     case multipleRemotePackages(productName: String)
+    case malformed
     var description: String {
         switch self {
         case let .notFound(path):
@@ -201,6 +202,8 @@ enum PBXProjError: Error, CustomStringConvertible, Equatable {
             return "Found multiple top-level packages named \(productName)"
         case let .multipleRemotePackages(productName: productName):
             return "Can not resolve dependency \(productName) - conflicting version requirements"
+        case .malformed:
+            return "The .pbxproj is malformed."
         }
     }
 }

Sources/XcodeProj/Objects/Project/PBXProj.swift

@@ -66,6 +66,41 @@ public final class PBXProj: Decodable {
             objects: pbxproj.objects
         )
     }
+
+    /// Initializes the project with the data representation of pbxproj file.
+    ///
+    /// - Parameters:
+    ///   - data: data representation of pbxproj file.
+    public convenience init(data: Data) throws {
+        var propertyListFormat = PropertyListSerialization.PropertyListFormat.xml
+
+        let serialized = try PropertyListSerialization.propertyList(
+            from: data,
+            options: .mutableContainersAndLeaves,
+            format: &propertyListFormat
+        )
+
+        guard let pbxProjDictionary = serialized as? [String: Any] else {
+            throw PBXProjError.malformed
+        }
+
+        let context = ProjectDecodingContext(
+            pbxProjValueReader: { key in
+                pbxProjDictionary[key]
+            }
+        )
+
+        let plistDecoder = XcodeprojPropertyListDecoder(context: context)
+        let pbxproj: PBXProj = try plistDecoder.decode(PBXProj.self, from: data)
+
+        self.init(
+            rootObject: pbxproj.rootObject,
+            objectVersion: pbxproj.objectVersion,
+            archiveVersion: pbxproj.archiveVersion,
+            classes: pbxproj.classes,
+            objects: pbxproj.objects
+        )
+    }
 
     private init(
         rootObject: PBXProject? = nil,
@@ -146,8 +181,11 @@ public final class PBXProj: Decodable {
             options: .mutableContainersAndLeaves,
             format: &propertyListFormat
         )
-        // swiftlint:disable:next force_cast
-        let pbxProjDictionary = serialized as! [String: Any]
+
+        guard let pbxProjDictionary = serialized as? [String: Any] else {
+            throw PBXProjError.malformed
+        }
+
         return (plistXML, pbxProjDictionary)
     }
 }

Tests/XcodeProjTests/Project/XcodeProjTests.swift

@@ -25,6 +25,20 @@ final class XcodeProjIntegrationTests: XCTestCase {
                                         initModel: XcodeProj.init(path:))
     }
 
+    func test_initialize_PBXProj_with_data() throws {
+        // Given
+        let pbxprojPath = iosProjectPath + "project.pbxproj"
+        let pbxprojFromDisk = try PBXProj(path: pbxprojPath)
+        let pbxprojData = try Data(contentsOf: pbxprojPath.url)
+
+        // When
+        let pbxprojFromData = try PBXProj(data: pbxprojData)
+        try pbxprojFromData.updateProjectName(path: pbxprojPath)
+
+        // Then
+        XCTAssertEqual(pbxprojFromData, pbxprojFromDisk)
+    }
+
     func test_write_includes_workspace_settings() throws {
         // Define workspace settings that should be written
         let workspaceSettings = WorkspaceSettings(buildSystem: .new, derivedDataLocationStyle: .default, autoCreateSchemes: false)