aurelia-dragula/src/classes.js

An aurelia compatible version of Dragula

/** This is purportedly necessary to support Internet Explorer (not Edge) properly (it doesn't support classList on SVG elements!) */

let cache = {}
const start = '(?:^|\\s)'
const end = '(?:\\s|$)'

function lookupClass (className) {
  var cached = cache[className]
  if (cached) {
    cached.lastIndex = 0
  } else {
    cache[className] = cached = new RegExp(start + className + end, 'g')
  }
  return cached
}

export function add (el, className) {
  if (el.classList) {
    el.classList.add(className)
    return
  }
  var current = el.className
  if (!current.length) {
    el.className = className
  } else if (!lookupClass(className).test(current)) {
    el.className += ' ' + className
  }
}

export function rm (el, className) {
  if (el.classList) {
    el.classList.remove(className)
    return
  }
  el.className = el.className.replace(lookupClass(className), ' ').trim();
}