wzxha / Sdifft

using the Myers's Difference Algorithm to compare differences between two equatable element

Sdifft

Using the Myers's Difference Algorithm to compare differences between two equatable element

Example(String)

import Sdifft

let source = "b"
let target = "abcd"
let diff = Diff(source: from, target: to)
diff.scripts // [.insert(into: 3), .insert(into: 2), .same(into: 1), .insert(into: 0)]

/// Get diff attributedString
let diffAttributes = 
    DiffAttributes(
        insert: [.backgroundColor: UIColor.green], 
        delete: [.backgroundColor: UIColor.red], 
        same: [.backgroundColor: UIColor.white]
    )
let attributedString = NSAttributedString(source: source, target: target, attributes: diffAttributes) 

// output ->
// a{green}b{black}cd{green}

Example(Line)

import Sdifft
let source = ["Hello"]
let target = ["Hello", "World", "!"]
let attributedString = 
    NSAttributedString(source: source, target: target, attributes: diffAttributes) { script, string in
        let string = NSMutableAttributedString(attributedString: string)
        string.append(NSAttributedString(string: "\n"))
        switch script {
        case .delete:
            string.insert(NSAttributedString(string: "- "), at: 0)
        case .insert:
            string.insert(NSAttributedString(string: "+ "), at: 0)
        case .same:
            string.insert(NSAttributedString(string: " "), at: 0)
        }
        return string
    }

// output ->
//    Hello 
//  + World{green}
//  + !{green}

Installation

Swift Package Manager

// Package.swift
let package = Package(
    name: "XXX",
    dependencies: [
        .Package(url: "https://github.com/Wzxhaha/Sdifft", majorVersion: 2)
    ]
)

Carthage

// Cartfile
github "Wzxhaha/Sdifft"

License

Sdifft is released under the MIT license. See LICENSE for details.