SwiftSyntax is a set of Swift libraries for parsing, inspecting, generating, and transforming Swift source code.

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.

The mainline branch of SwiftSyntax tracks the latest developments. It is not an official release, and is subject to rapid changes in APIs and behaviors. To use it, add this repository to the Package.swift manifest of your project:

// swift-tools-version:5.7
import PackageDescription

let package = Package(
  name: "MyTool",
  dependencies: [
    .package(url: "https://github.com/apple/swift-syntax.git", branch: "main"),
  ],
  targets: [
    .target(name: "MyTool", dependencies: [
      .product(name: "SwiftSyntax", package: "swift-syntax"),
    ]),
  ]
)

Mainline SwiftSyntax also includes

• SwiftParser for natively parsing source code
• SwiftOperators for folding SwiftSyntax trees containing operators
• SwiftSyntaxBuilder for generating Swift code with a result builder-style interface

Releases of SwiftSyntax are aligned with corresponding language and tooling releases and are stable. To use them, add this repository to the Package.swift manifest of your project:

// swift-tools-version:5.7
import PackageDescription

let package = Package(
  name: "MyTool",
  dependencies: [
    .package(url: "https://github.com/apple/swift-syntax.git", exact: "<#Specify Release tag#>"),
  ],
  targets: [
    .target(name: "MyTool", dependencies: [
      .product(name: "SwiftSyntax", package: "swift-syntax"),
    ]),
  ]
)

Replace <#Specify Release tag#> by the version of SwiftSyntax that you want to use (see the following table for mapping details).

SwiftSyntax uses DocC bundles for its documentation. To view rendered documentation in Xcode, open the SwiftSyntax package and select

Product > Build Documentation

Associated articles are written in markdown, and can be viewed in a browser, text editor, or IDE.

• SwiftSyntax
• SwiftParser
• SwiftOperators

Start contributing to SwiftSyntax see this guide for more information.

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

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.