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https://github.com/jectivex/JXKit
The pure swift interface to JavaScriptCore for iOS, macOS, tvOS, and Linux
https://github.com/jectivex/JXKit
hacktoberfest ios javascriptcore swift swift-library swift-linux
Last synced: about 2 months ago
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The pure swift interface to JavaScriptCore for iOS, macOS, tvOS, and Linux
- Host: GitHub
- URL: https://github.com/jectivex/JXKit
- Owner: jectivex
- License: lgpl-3.0
- Created: 2021-05-24T00:25:18.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2023-01-05T23:14:58.000Z (over 1 year ago)
- Last Synced: 2024-07-05T13:37:19.488Z (3 months ago)
- Topics: hacktoberfest, ios, javascriptcore, swift, swift-library, swift-linux
- Language: Swift
- Homepage: https://www.jective.org/JXKit/documentation/jxkit/
- Size: 1.15 MB
- Stars: 61
- Watchers: 3
- Forks: 9
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- License: LICENSE.LGPL
Awesome Lists containing this project
- awesome-github-star - JXKit
README
# JXKit
[![Build Status][GitHubActionBadge]][ActionsLink]
[![Swift5 compatible][Swift5Badge]][Swift5Link]
![Platform][SwiftPlatforms]
JXKit is a cross-plarform swift module for interfacing with
`JavaScriptCore`. It provides a fluent API for working with an embedded
[`JXContext`](https://www.jective.org/JXKit/documentation/jxkit/jxcontext),
including script evaluation, error handling, and Codable mashalling.
JXKit is cross-platform for Darwin (macOS/iOS) and Linux,
with experimental support for Windows and Android.
JSC to be used on platforms where the Objective-C runtime is unavailable (e.g., Linux).
## API
Browse the [API Documentation].
### Direct function invocation
Functions can be accessed (and cached) to be invoked directly with codable arguments:
```swift
let context = JXContext()
let hypot = try context.global["Math"]["hypot"]
assert(hypot.isFunction == true)
let result = try hypot.call(withArguments: try [context.encode(3), context.encode(4)])
let hypotValue = try result.double
assert(hypotValue == 5.0)
```
### Codable passing
JXKit supports encoding and decoding Swift types directly into the `JXValue` instances, which enables `Codable` instances to be passed back and forth to the virtual machine with minimal overhead. Since encoding & decoding doesn't use JSON `stringify` & `parse`, this can lead to considerable performance improvements when interfacing between Swift & JS.
The above invocation of `Math.hypot` can instead be performed by wrapping the arguments in an `Encodable` struct, and returning a `Decodable` value.
```swift
/// An example of invoking `Math.hypot` in a wrapper function that takes an encodable argument and returns a Decodable retult.
struct AB: Encodable { let a, b: Double }
struct C: Decodable { let c: Double }
let context = JXContext()
let hypot = try context.eval("(function(args) { return { c: Math.hypot(args.a, args.b) }; })")
assert(hypot.isFunction == true)
let result: C = try hypot.call(withArguments: [context.encode(AB(a: 3, b: 4))]).toDecodable(ofType: C.self)
assert(result.c == 5)
```
### JavaScriptCore Compatibility
The JXKit API is a mostly drop-in replacement for the Objective-C `JavaScriptCore` framework available on most Apple devices. E.g., the following JavaScriptCore code:
```swift
import JavaScriptCore
let jsc = JSContext()
let value: JSValue = jsc.evaluateScript("1+2")
assert(value.int == 3)
```
becomes:
```swift
import JXKit
let jxc = JXContext()
let value: JXValue = try jxc.eval("1+2")
assert(try value.int == 3)
```
## Installation
> _Note:_ Requires Swift 5.5+
### Swift Package Manager
The [Swift Package Manager][] is a tool for managing the distribution of
Swift code.
1. Add the following to your `Package.swift` file:
```swift
// swift-tools-version:5.6
import PackageDescription
let package = Package(
name: "MyPackage",
products: [
.library(
name: "MyPackage",
targets: ["MyPackage"]),
],
dependencies: [
.package(name: "JXKit", url: "https://github.com/jectivex/JXKit.git", .upToNextMajor(from: "3.0.0")),
],
targets: [
.target(
name: "MyPackage",
dependencies: ["JXKit"]),
.testTarget(
name: "MyPackageTests",
dependencies: ["MyPackage"]),
]
)
```
2. Build your project:
```sh
$ swift build
```
## License
Like the [JavaScriptCore](https://webkit.org/licensing-webkit/) framework
upon which it is built, JXKit is licensed under the GNU LGPL license.
See [LICENSE.LGPL](LICENSE.LGPL) for details.
## Related
Projects that are based on JXKit:
- [Jack][]: Cross-platform framework for scripting `Combine.ObservableObject` and SwiftUI (LGPL)
## Dependencies
- [JavaScriptCore][]: Cross-platform JavaScript engine (LGPL)[^1]
[^1]: JavaScriptCore is included with macOS and iOS as part of the embedded [WebCore](https://webkit.org/licensing-webkit/) framework (LGPL); on Linux JXKit uses [WebKit GTK JavaScriptCore](https://webkitgtk.org/).
[Swift Package Manager]: https://swift.org/package-manager
[API Documentation]: https://www.jective.org/JXKit/documentation/jxkit/
[ProjectLink]: https://github.com/jectivex/JXKit
[ActionsLink]: https://github.com/jectivex/JXKit/actions
[API Documentation]: https://www.jective.org/JXKit/documentation/jxkit/
[Swift]: https://swift.org/
[OpenCombine]: https://github.com/OpenCombine/OpenCombine
[JXBridge]: https://github.com/jectivex/JXBridge
[JavaScriptCore]: https://trac.webkit.org/wiki/JavaScriptCore
[GitHubActionBadge]: https://img.shields.io/github/workflow/status/jectivex/JXKit/JXKit%20CI
[Swift5Badge]: https://img.shields.io/badge/swift-5-orange.svg?style=flat
[Swift5Link]: https://developer.apple.com/swift/
[SwiftPlatforms]: https://img.shields.io/badge/Platforms-macOS%20|%20iOS%20|%20tvOS%20|%20Linux-teal.svg
## TODO
- Consider evalClosureAsync variant for async code.
- Better reporting of errors from async code / Promises.