https://github.com/soffes/diff

Simple diff library in pure Swift
https://github.com/soffes/diff

carthage ios macos swift tvos watchos

Last synced: 26 days ago
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Simple diff library in pure Swift

• Host: GitHub
• URL: https://github.com/soffes/diff
• Owner: soffes
• License: mit
• Created: 2016-04-13T00:27:46.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2020-06-03T16:21:08.000Z (over 4 years ago)
• Last Synced: 2024-08-14T14:05:20.243Z (4 months ago)
• Topics: carthage, ios, macos, swift, tvos, watchos
• Language: Swift
• Size: 37.1 KB
• Stars: 122
• Watchers: 6
• Forks: 9
• Open Issues: 0
• Metadata Files:
  • Readme: Readme.markdown
  • License: LICENSE
  • Support: Support/Diff.h

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README

        
# Diff

[![Version](https://img.shields.io/github/release/soffes/Diff.svg)](https://github.com/soffes/Diff/releases)

[![Build Status](https://github.com/soffes/Color/workflows/Tests/badge.svg)](https://github.com/soffes/Color/actions)

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

Simple diffing library in pure Swift.

## Installing

You can use [Carthage](https://github.com/Carthage/Carthage) or [Swift Package Manager](https://github.com/apple/swift-package-manager) to install Diff.

## Usage

Start by importing the package:

```swift

import Diff

```

### Same

If there is no difference, the diff will be `nil`.

``` swift

diff("Hello", "Hello") // nil

```

For the sake of brevity, we'll `!` the rest of the examples since we know they're different.

### Insert

``` swift

let (range, string) = diff("Hello world", "Hello there world")!

// range: 6..<6

// string: "there "

```

### Remove

``` swift

let (range, string) = diff("Hello there world", "Hello world")!

// range: 6..<12

// string: ""

```

### Other Types

Diff can diff any array. Here's an array of things that conform to `Equatable`:

``` swift

let (range, replacement) = diff([1, 2, 3], [1, 2, 3, 4])!

// range: 3..<3

// replacement: [4]

```

You can even use arrays of anything as long as you can compare them:

```swift

let before: [Foo] = [a, b]

let after: [Foo] = [b]

let (range, replacement) = diff(before, after, compare: Foo.compare)!

// range: 0..<1

// replacement: []

```

## Development

If you want to contribute to Diff, please write a test.

Building and running the tests locally with SPM is easy:

    $ git clone https://github.com/soffes/Diff

    $ cd Diff

    $ swift build

    $ swift test

## Thanks

Thanks to [Jonathan Clem](https://github.com/jclem) for the original algorithm and [Caleb Davenport](https://github.com/calebd) for inspiration for the generics implementation and help debugging a few edge cases!