Haring

IMPORTANT NOTE: Haring is a fork of MarkdownKit that was created when that project had been abandoned. MarkdownKit has a new owner and has been actively developed to apply most of the changes that Haring has and a few more. However, it still has only one developer. Therefore, this fork will still be maintained for the time being. However, there is no roadmap to ehancing Haring. Also, the project I was using Haring in has been cancelled, so I no longer have a vested interest in maintaining it. We do welcome pull requests though, and we have 3 maintainers. -- David Lari

Haring is a customizable and extensible Markdown parser for iOS. It supports many of the standard Markdown elements through the use of Regular Expressions. It also allows customization of font and color attributes for all the Markdown elements.

Haring was forked from Ivan Bruel's MarkdownKit which appears to be no longer maintained. You should be able to drop this in as a replacement very easily.

Haring is named after PopArt artist Keith Haring.

Screenshot

Installation

Installation via CocoaPods

Haring is available through CocoaPods. CocoaPods is a dependency manager that automates and simplifies the process of using 3rd-party libraries like Haring in your projects. To integrate Haring into your Xcode project using CocoaPods, simply add the following line to your pod:

pod 'Haring'

Version 2.1.x supports Xcode 10 and Swift 4.2 SDK.

Older versions are not updated but if you need to support older Swift versions see below.

Version 2.0.x supports Xcode 9 and Swift 4.0 through 4.1x.

pod 'Haring', '~> 2.0.0'

Version 1.5 supports Xcode 9 and Swift 3.2. If you need this, add the version:

pod 'Haring', '~> 1.5.0'

Version 1.4 supports Xcode 8 and Swift 3.1. If you need this, add the version:

pod 'Haring', '~> 1.4.0'

Afterwards, run the following command:

pod install

Installation via Carthage

Haring is available through Carthage. Carthage is a decentralized dependency manager that builds your dependencies and provides you with binary frameworks.

You can install Carthage via Homebrew with the following command:

brew update
brew install carthage

To integrate Haring into your Xcode project using Carthage, simply add the following line to your Cartfile:

github "davidlari/Haring"

Afterwards, run the following command:

carthage update

Supported Elements

*italic* or _italics_
**bold** or __bold__

# Header 1
## Header 2
### Header 3
#### Header 4
##### Header 5
###### Header 6

> Quote

* List
- List
+ List

`code` or ```code```
[Links](http://github.com/davidlari/Haring/)

Usage

In order to use Haring to transform Markdown into NSAttributedString, all you have to do is create an instance of MarkdownParser and call the parse(_) function.

let markdownParser = MarkdownParser()
let markdown = "I support a *lot* of custom Markdown **Elements**, even `code`!"
label.attributedText = markdownParser.parse(markdown)

Customization

let markdownParser = MarkdownParser(font: UIFont.systemFontOfSize(18))
markdownParser.automaticLinkDetectionEnabled = false
markdownParser.bold.color = UIColor.redColor()
markdownParser.italic.font = UIFont.italicSystemFontOfSize(300)
markdownParser.header.fontIncrease = 4

Extensibility

To add new Markdown elements all you have to do is implement the MarkdownElement protocol (or descendants) and add it to the MarkdownParser.

import Haring

class MarkdownSubreddit: MarkdownLink {

  private static let regex = "(^|\\s|\\W)(/?r/(\\w+)/?)"

  override var regex: String {
    return MarkdownSubreddit.regex
  }

  override func match(match: NSTextCheckingResult,
                             attributedString: NSMutableAttributedString) {
    let subredditName = attributedString.attributedSubstringFromRange(match.rangeAtIndex(3)).string
    let linkURLString = "http://reddit.com/r/\(subredditName)"
    formatText(attributedString, range: match.range, link: linkURLString)
    addAttributes(attributedString, range: match.range, link: linkURLString)
  }

}

let markdownParser = MarkdownParser(customElements: [MarkdownSubreddit()])
let markdown = "**/r/iosprogramming** can be *markdown* as well!"
label.attributedText = markdownParser.parse(markdown)

Example

To run the example project, clone the repo, and run pod install from the Example directory first.

About

Haring is maintained by David Lari. Contributions and pull requests are welcomed.

Acknowledgements

Haring was derived from MarkdownKit by Ivan Bruel. It was created due to the apparent abandonment of MarkdownKit.

MarkdownKit in turn, was heavily inspired by TSMarkdownParser and also SwiftyMarkdown.

Special thanks to Michael Brown for helping out with the UTF-16 Escaping/Unescaping.

License

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