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https://github.com/raspu/highlightr

iOS & OSX Syntax Highlighter.
https://github.com/raspu/highlightr

highlight ios ios-lib macos sample-gif swift-library syntax-highlighting

Last synced: 6 days ago
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iOS & OSX Syntax Highlighter.

Host: GitHub
URL: https://github.com/raspu/highlightr
Owner: raspu
License: mit
Created: 2016-05-01T21:19:49.000Z (almost 9 years ago)
Default Branch: master
Last Pushed: 2024-07-29T14:22:51.000Z (7 months ago)
Last Synced: 2025-02-05T23:13:28.183Z (13 days ago)
Topics: highlight, ios, ios-lib, macos, sample-gif, swift-library, syntax-highlighting
Language: Swift
Size: 2.83 MB
Stars: 1,708
Watchers: 37
Forks: 269
Open Issues: 27
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE

Awesome Lists containing this project

README

        # Highlightr

[![Version](https://img.shields.io/cocoapods/v/Highlightr.svg?style=flat)](http://cocoapods.org/pods/Highlightr)

[![Carthage Compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)

[![CocoaPods](https://img.shields.io/cocoapods/metrics/doc-percent/Highlightr.svg)](http://cocoadocs.org/docsets/Highlightr/1.1.0/)

[![License](https://img.shields.io/cocoapods/l/Highlightr.svg?style=flat)](http://cocoapods.org/pods/Highlightr)

[![Platform](https://img.shields.io/cocoapods/p/Highlightr.svg?style=flat)](http://cocoapods.org/pods/Highlightr)

Highlightr is an iOS & macOS syntax highlighter built with Swift. It uses [highlight.js](https://highlightjs.org/) as it core, supports [185 languages and comes with 89 styles](https://highlightjs.org/static/demo/).

Takes your lame string with code and returns a NSAttributtedString with proper syntax highlighting.

![Sample Gif A](https://raw.githubusercontent.com/raspu/Highlightr/master/mix2.gif)

![Sample Gif B](https://raw.githubusercontent.com/raspu/Highlightr/master/coding.gif)

## Installation

### Requirements

- iOS 8.0+

- macOS 10.10+

 

### CocoaPods

[CocoaPods](http://cocoapods.org) is a dependency manager for Cocoa projects. You can install it with the following command:

```bash

$ gem install cocoapods

```

To integrate Highlightr into your Xcode project using CocoaPods, specify it in your `Podfile`:

```ruby

source 'https://github.com/CocoaPods/Specs.git'

use_frameworks!

target '' do

    pod 'Highlightr'

end

```

Then, run the following command:

```bash

$ pod install

```

### Carthage

[Carthage](https://github.com/Carthage/Carthage) is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage with [Homebrew](http://brew.sh/) using the following command:

```bash

$ brew update

$ brew install carthage

```

To integrate Highlightr into your Xcode project using Carthage, specify it in your `Cartfile`:

```ogdl

github "raspu/Highlightr"

```

Run `carthage update` to build the framework and drag the built `Highlightr.framework` into your Xcode project.Highlightr

## Usage

Highlightr provides two main classes:

### Highlightr

This is the main endpoint, you can use it to convert code strings into NSAttributed strings.

```Swift

	let highlightr = Highlightr()

	highlightr.setTheme(to: "paraiso-dark")

	let code = "let a = 1"

	// You can omit the second parameter to use automatic language detection.

	let highlightedCode = highlightr.highlight(code, as: "swift") 

	

```

### CodeAttributedString

A subclass of NSTextStorage, you can use it to highlight text on real time.

```Swift

	let textStorage = CodeAttributedString()

	textStorage.language = "Swift"

	let layoutManager = NSLayoutManager()

	textStorage.addLayoutManager(layoutManager)

	let textContainer = NSTextContainer(size: view.bounds.size)

	layoutManager.addTextContainer(textContainer)

	let textView = UITextView(frame: yourFrame, textContainer: textContainer)

```

## JavaScript?

Yes, Highlightr relies on iOS & macOS [JavaScriptCore](https://developer.apple.com/library/ios/documentation/Carbon/Reference/WebKit_JavaScriptCore_Ref/index.html#//apple_ref/doc/uid/TP40004754) to parse the code using highlight.js. This is actually quite fast!

## Performance

It will never be as fast as a native solution, but it's fast enough to be used on a real time editor.

It comes with a custom made HTML parser for creating NSAttributtedStrings, is pre-processing the themes and is preloading the JS libraries. As result it's taking around of 50 ms on my iPhone 6s for processing 500 lines of code.

## Documentation

You can find the documentation for the latest release on [cocoadocs](http://cocoadocs.org/docsets/Highlightr/).

## License

Highlightr is available under the MIT license. See the LICENSE file for more info.

Highlight.js is available under the BSD license. You can find the [license file here](https://github.com/isagalaev/highlight.js/blob/master/LICENSE).