Swiftpack.co - Package - jpsim/SourceKitten


An adorable little framework and command line tool for interacting with SourceKit.

SourceKitten links and communicates with sourcekitd.framework to parse the Swift AST, extract comment docs for Swift or Objective-C projects, get syntax data for a Swift file and lots more!

Azure Pipelines


Building SourceKitten requires Xcode 10.2 or later or a Swift 5.0 toolchain or later with the Swift Package Manager.

SourceKitten typically supports previous versions of SourceKit.


Run brew install sourcekitten.

Swift Package Manager

Run swift build in the root directory of this project.

Xcode (via Make)

Run make install in the root directory of this project.


Download and open SourceKitten.pkg from the releases tab.

Command Line Usage

Once SourceKitten is installed, you may use it from the command line.

$ sourcekitten help
Available commands:

   complete    Generate code completion options
   doc         Print Swift or Objective-C docs as JSON
   format      Format Swift file
   help        Display general or command-specific help
   index       Index Swift file and print as JSON
   request     Run a raw sourcekit request
   structure   Print Swift structure information as JSON
   syntax      Print Swift syntax information as JSON
   version     Display the current version of SourceKitten

How is SourceKit resolved?

SourceKitten searches for SourceKit in the following order:

  • xcrun -find swift
  • /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
  • /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
  • ~/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
  • ~/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain

On Linux, SourceKit is expected to be located in /usr/lib/libsourcekitdInProc.so or specified by the LINUX_SOURCEKIT_LIB_PATH environment variable.

Projects Built With SourceKitten

  • SwiftLint: A tool to enforce Swift style and conventions.
  • Jazzy: Soulful docs for Swift & Objective-C.
  • Sourcery: Meta-programming for Swift, stop writing boilerplate code.
  • SwiftyMocky: Framework for mock generation.
  • SourceKittenDaemon: Swift Auto Completions for any Text Editor.
  • SourceDocs: Command Line Tool that generates Markdown documentation from inline source code comments.
  • Cuckoo: First boilerplate-free mocking framework for Swift.
  • IBAnalyzer: Find common xib and storyboard-related problems without running your app or writing unit tests.
  • Taylor: Measure Swift code metrics and get reports in Xcode, Jenkins and other CI platforms.
See More
  • https://github.com/appsquickly/TyphoonSwift
  • https://github.com/banjun/bansan
  • https://github.com/Beaver/BeaverCodeGen
  • https://github.com/Ben-G/Meet
  • https://github.com/dfreemanRIIS/ETAMock
  • https://github.com/dostu/SwiftMetric
  • https://github.com/draven-archive/MetaKit
  • https://github.com/geosor/SwiftVisualizer
  • https://github.com/godfreynolan/AgileSwiftTst
  • https://github.com/godfreynolan/CodeCraftsman
  • https://github.com/ilyapuchka/dipgen
  • https://github.com/ilyapuchka/SourceKittenEditorExtension
  • https://github.com/interstateone/Unused
  • https://github.com/ishkawa/DIKit
  • https://github.com/IvanovGeorge/FBAuth
  • https://github.com/jmpg93/NavigatorSwift
  • https://github.com/jpmartha/Pancake
  • https://github.com/jpweber/Kontext
  • https://github.com/KenichiroSato/CatDogTube
  • https://github.com/klundberg/grift
  • https://github.com/kovtun1/DependenciesGraph
  • https://github.com/lvsti/Bridgecraft
  • https://github.com/maralla/completor-swift
  • https://github.com/marcsnts/Shopify-Winter18-Technical
  • https://github.com/momentumworks/Formula
  • https://github.com/nevil/UNClassDiagram
  • https://github.com/norio-nomura/LinuxSupportForXcode
  • https://github.com/paulofaria/swift-package-crawler-data
  • https://github.com/rajat-explorer/Github-Profiler
  • https://github.com/rockbruno/swiftshield
  • https://github.com/S2dentik/Enlight
  • https://github.com/seanhenry/SwiftMockGeneratorForXcode
  • https://github.com/sharplet/swiftags
  • https://github.com/siejkowski/Croupier
  • https://github.com/SwiftKit/CuckooGenerator
  • https://github.com/SwiftKit/Torch
  • https://github.com/SwiftTools/SwiftFelisCatus
  • https://github.com/swizzlr/lux
  • https://github.com/tid-kijyun/XcodeSourceEditorExtension-ProtocolImplementation
  • https://github.com/tjarratt/fake4swift
  • https://github.com/tkohout/Genie
  • https://github.com/tomquist/MagicMirror
  • https://github.com/TurfDb/TurfGen
  • https://github.com/vadimue/AwesomeWeather
  • https://github.com/yonaskolb/Beak
  • https://github.com/zenzz/vs-swifter-server
  • https://github.com/zenzz/zxxswifter-server
  • https://github.com/scribd/Weaver
  • https://github.com/Nonchalant/FactoryProvider


Running sourcekitten complete --file file.swift --offset 123 or sourcekitten complete --text "0." --offset 2 will print out code completion options for the offset in the file/text provided:

  "descriptionKey" : "advancedBy(n: Distance)",
  "associatedUSRs" : "s:FSi10advancedByFSiFSiSi s:FPSs21RandomAccessIndexType10advancedByuRq_S__Fq_Fqq_Ss16ForwardIndexType8Distanceq_ s:FPSs16ForwardIndexType10advancedByuRq_S__Fq_Fqq_S_8Distanceq_ s:FPSs10Strideable10advancedByuRq_S__Fq_Fqq_S_6Strideq_ s:FPSs11_Strideable10advancedByuRq_S__Fq_Fqq_S_6Strideq_",
  "kind" : "source.lang.swift.decl.function.method.instance",
  "sourcetext" : "advancedBy(<#T##n: Distance##Distance#>)",
  "context" : "source.codecompletion.context.thisclass",
  "typeName" : "Int",
  "moduleName" : "Swift",
  "name" : "advancedBy(n: Distance)"
  "descriptionKey" : "advancedBy(n: Self.Distance, limit: Self)",
  "associatedUSRs" : "s:FeRq_Ss21RandomAccessIndexType_SsS_10advancedByuRq_S__Fq_FTqq_Ss16ForwardIndexType8Distance5limitq__q_",
  "kind" : "source.lang.swift.decl.function.method.instance",
  "sourcetext" : "advancedBy(<#T##n: Self.Distance##Self.Distance#>, limit: <#T##Self#>)",
  "context" : "source.codecompletion.context.superclass",
  "typeName" : "Self",
  "moduleName" : "Swift",
  "name" : "advancedBy(n: Self.Distance, limit: Self)"

To use the iOS SDK, pass -sdk and -target arguments preceded by --:

sourcekitten complete --text "import UIKit ; UIColor." --offset 22 -- -target arm64-apple-ios9.0 -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.0.sdk


Running sourcekitten doc will pass all arguments after what is parsed to xcodebuild (or directly to the compiler, SourceKit/clang, in the --single-file mode).

Example usage

  1. sourcekitten doc -- -workspace SourceKitten.xcworkspace -scheme SourceKittenFramework
  2. sourcekitten doc --single-file file.swift -- -j4 file.swift
  3. sourcekitten doc --module-name Alamofire -- -project Alamofire.xcodeproj
  4. sourcekitten doc -- -workspace Haneke.xcworkspace -scheme Haneke
  5. sourcekitten doc --objc Realm/Realm.h -- -x objective-c -isysroot $(xcrun --show-sdk-path) -I $(pwd)


Running sourcekitten structure --file file.swift or sourcekitten structure --text "struct A { func b() {} }" will return a JSON array of structure information:

  "key.substructure" : [
      "key.kind" : "source.lang.swift.decl.struct",
      "key.offset" : 0,
      "key.nameoffset" : 7,
      "key.namelength" : 1,
      "key.bodyoffset" : 10,
      "key.bodylength" : 13,
      "key.length" : 24,
      "key.substructure" : [
          "key.kind" : "source.lang.swift.decl.function.method.instance",
          "key.offset" : 11,
          "key.nameoffset" : 16,
          "key.namelength" : 3,
          "key.bodyoffset" : 21,
          "key.bodylength" : 0,
          "key.length" : 11,
          "key.substructure" : [

          "key.name" : "b()"
      "key.name" : "A"
  "key.offset" : 0,
  "key.diagnostic_stage" : "source.diagnostic.stage.swift.parse",
  "key.length" : 24


Running sourcekitten syntax --file file.swift or sourcekitten syntax --text "import Foundation // Hello World" will return a JSON array of syntax highlighting information:

    "offset" : 0,
    "length" : 6,
    "type" : "source.lang.swift.syntaxtype.keyword"
    "offset" : 7,
    "length" : 10,
    "type" : "source.lang.swift.syntaxtype.identifier"
    "offset" : 18,
    "length" : 14,
    "type" : "source.lang.swift.syntaxtype.comment"


Running sourcekitten request --yaml [FILE|TEXT] will execute a sourcekit request with the given yaml. For example:

key.request: source.request.cursorinfo
key.sourcefile: "/tmp/foo.swift"
key.offset: 8
  - "/tmp/foo.swift"


Most of the functionality of the sourcekitten command line tool is actually encapsulated in a framework named SourceKittenFramework.

If you’re interested in using SourceKitten as part of another tool, or perhaps extending its functionality, take a look at the SourceKittenFramework source code to see if the API fits your needs.

Note: SourceKitten is written entirely in Swift, and the SourceKittenFramework API is not designed to interface with Objective-C.


MIT licensed.


Stars: 1697
Help us keep the lights on


0.27.0 - Nov 7, 2019

  • Update Commandant dependency to version 0.17.0, removing the antitypical/Result dependency in favor of the Swift standard library's Result type.
    JP Simard #623
  • None.
Bug Fixes
  • None.

0.26.0 - Sep 26, 2019

  • SourceKitten now requires Swift 5.0 or higher to build.
    JP Simard
  • Support building SourceKitten with Swift 5.1.
    Pedro Larroy

  • Add new libclang types introduced between 0.49 and 0.59.
    JP Simard

  • Add new SwiftDeclarationAttributeKind and SwiftDeclarationKind members introduced in Swift 5.1.
    JP Simard

  • SyntaxKind now conforms to CaseIterable.
    JP Simard

Bug Fixes
  • Fix Swift response files for paths including special characters.
    John Fairhurst

0.25.0 - Sep 6, 2019

  • None.
  • Add --spm option to guess the name of a Swift Package Manager module for documentation generation.
    John Fairhurst

  • Support doc generation for modules built with Xcode 11.
    John Fairhurst

  • Add Module.init?(spmArguments:spmName:inPath) and use in doc command to ensure Swift Package Manager module documentation is up to date.
    John Fairhurst

Bug Fixes

0.24.0 - Jul 22, 2019

  • Change Module.init?(spmName:) to Module.init?(spmName:inPath:).
    Norio Nomura

  • SourceKitObjectConvertible now has SourceKitObject parameter requirement instead of sourcekitd_object_t. SourceKitObject isn't publicly initializable (this helps memory management).
    Colton Schlosser

  • Dictionary and Array now conditionally conform to SourceKitObjectConvertible, instead of crashing when using unexpected types.
    Colton Schlosser

  • Add cursorInfoUSR case to the Request.
    Timofey Solonin

  • Add a Dictionary<String, SourceKitRepresentable>.referencedUSRs computed property to retrieve referenced USRs from a SourceKit cursor info response.
    Colton Schlosser

Bug Fixes
  • Fix testCommandantDocsSPM failed on using Swift Package in Xcode 11, because Xcode 11 does not use SRCROOT as current directory on executing tests in Package.swift.
    Norio Nomura

  • Release memory created for sourcekitd requests.
    Colton Schlosser realm/SwiftLint#2812

0.23.2 - May 12, 2019

  • None.
Bug Fixes
  • None.