Generate Equatable in terms of member fields

GenerateEquatable.swift

//: Playground - noun: a place where people can play

import UIKit


func generateEquatable(_ t: Any) -> String {
    var output = ""
    let mirrorPlace = Mirror(reflecting: t)
    let type = mirrorPlace.subjectType
    output += ("extension \(type): Equatable {\n")
    output += ("    static func ==(lhs: \(type), rhs: \(type)) -> Bool {\n")
    output += ("        return ")

    var lines: [String] = []
    for (i, child) in mirrorPlace.children.enumerated() {
        let ind = (i == 0) ? "" : "            "
        lines.append("\(ind)lhs.\(child.label!) == rhs.\(child.label!)")
    }

    output += lines.map{String($0)}.joined(separator: " &&\n")
    output += ("\n    }")
    output += ("\n}")
    
    return output
}


struct Term {
    let offset: Int
    let value: String
}

let term = Term(offset: 0, value: "")
print(generateEquatable(term))
// ->
//  extension Term: Equatable {
//      func ==(lhs: Term, rhs: Term) -> Bool {
//          return lhs.offset == rhs.offset &&
//              lhs.value == rhs.value
//      }
//  }