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apple/swift-syntax xcode11-beta1
A set of Swift libraries for parsing, inspecting, generating, and transforming Swift source code.
⭐️ 3,000
🕓 8 hours ago
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.package(url: "https://github.com/apple/swift-syntax.git", from: "xcode11-beta1")

Swift Syntax

The swift-syntax package is a set of libraries that work on a source-accurate tree representation of Swift source code, called the SwiftSyntax tree. The SwiftSyntax tree forms the backbone of Swift’s macro system – the macro expansion nodes are represented as SwiftSyntax nodes and a macro generates a SwiftSyntax tree to be inserted into the source file.


You can read SwiftSyntax’s documentation on swiftpackageindex.com.

A great way to interactively explore the SwiftSyntax tree of a source file is https://swift-ast-explorer.com, developed by @kishikawakatsumi.

A set of example usages of swift-syntax can be found in Examples.


Releases of SwiftSyntax are aligned with corresponding language and tooling releases, for example the major version 509 of swift-syntax is aligned with Swift 5.9.

To depend on swift-syntax in a SwiftPM package, add the following to your Package.swift.

dependencies: [
  .package(url: "https://github.com/apple/swift-syntax.git", from: "<#latest swift-syntax tag#>"),

To add swift-syntax as a dependency of your Xcode project, go to the Package Dependencies tab of your Xcode project, click the plus button and search for https://github.com/apple/swift-syntax.git.

Reporting Issues

If you should hit any issues while using SwiftSyntax, we appreciate bug reports on GitHub Issue.


Start contributing to SwiftSyntax see this guide for more information.


SwiftSyntax provides an experimental Bazel build configuration, maintained by Keith Smiley. To use it you can pull the source archive from the relevant release tag into your WORKSPACE and depend on the libraries you need from the BUILD.bazel file. Each library also has an associated Library_opt target (such as SwiftSyntax_opt) which forces SwiftSyntax to always build with optimizations enabled. This may help local runtime performance at the cost of debuggability, and initial build time. Please tag any issues related to the Bazel configuration with the label "Bazel".


Please see LICENSE for more information.


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Release Notes

4 weeks ago

Compared to 510.0.0 this fixes a possible misaligned memory access.

It also contains the following changes from 510.0.0.

New APIs


API-Incompatible Changes

  • NoteMessage.fixItID renamed to noteID

  • DiagnosticSpec.highlight replaced by highlights

    • Description: The use of a single string highlight prevented users from asserting that a macro highlighted exactly the expected set of syntax nodes. Use of DiagnosticSpec.init(...highlight:...) is deprecated and forwards to DiagnosticSpec.init(...highlights:...). Migrating from highlight to highlights is straightforward; any uses of DiagnosticSpec.init which do not specify a highlight do not need to change, otherwise:
      • If the diagnostic highlights a single node, the highlight string should be replaced with a single element array containing the same string without any trailing trivia, e.g., highlight: "let " -> highlights: ["let"].
      • If the diagnostic highlights multiple nodes, the highlight string should be replaced with an array containing an element for each highlighted node, e.g., highlight: "struct {}" -> highlights: ["struct", "{}"].
    • Pull Request: https://github.com/apple/swift-syntax/pull/2213

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