Convert a CGPath to an SVG element with this Swift extension to CGPath

CGPath+svg.swift

//
//  CGPath+svg.swift
//
//  Create an SVG element from a CGPath.
//
//  Created by Dave Ceddia.
//  MIT Licensed
//
//  Inspired by: https://github.com/mro/MROGeometry/blob/master/MROGeometry/CGPathWriter.c

import Foundation
import Cocoa

extension CGPath {
    func svg(width: CGFloat, height: CGFloat, stroke: String = "black", fill: String = "transparent") -> String {
        return """
        <svg width="\(width)" height="\(height)" xmlns="http://www.w3.org/2000/svg">
            <path d="\(svgPath)" stroke="\(stroke)" fill="\(fill)" />
        </svg>
        """
    }
    
    var svgPath: String {
        var result = ""
        
        applyWithBlock() { element in
            let el = element.pointee
            switch(el.type) {
            case .moveToPoint:
                result += String(format: "M%f,%f", el.points[0].x, el.points[0].y)
            case .addLineToPoint:
                result += String(format: "L%f,%f", el.points[0].x, el.points[0].y)
            case .addQuadCurveToPoint:
                result += String(format: "Q%f,%f,%f,%f", el.points[0].x, el.points[0].y, el.points[1].x, el.points[1].y)
            case .addCurveToPoint:
                result += String(format: "C%f,%f,%f,%f,%f,%f", el.points[0].x, el.points[0].y, el.points[1].x, el.points[1].y, el.points[2].x, el.points[2].y)
            case .closeSubpath:
                result += "Z"
            default:
                // shouldn't hit this. but if we do, ignore it
                break
            }
        }
        
        return result
    }
}