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/* @flow */
const whitespaceRE = /\s+/
/**
* Add class with compatibility for SVG since classList is not supported on
* SVG elements in IE
*/
export function addClass (el: HTMLElement, cls: ?string) {
/* istanbul ignore if */
if (!cls || !(cls = cls.trim())) {
return
}
/* istanbul ignore else */
if (el.classList) {
if (cls.indexOf(' ') > -1) {
cls.split(whitespaceRE).forEach(c => el.classList.add(c))
} else {
el.classList.add(cls)
}
} else {
const cur = ` ${el.getAttribute('class') || ''} `
if (cur.indexOf(' ' + cls + ' ') < 0) {
el.setAttribute('class', (cur + cls).trim())
}
}
}
/**
* Remove class with compatibility for SVG since classList is not supported on
* SVG elements in IE
*/
export function removeClass (el: HTMLElement, cls: ?string) {
/* istanbul ignore if */
if (!cls || !(cls = cls.trim())) {
return
}
/* istanbul ignore else */
if (el.classList) {
if (cls.indexOf(' ') > -1) {
cls.split(whitespaceRE).forEach(c => el.classList.remove(c))
} else {
el.classList.remove(cls)
}
if (!el.classList.length) {
el.removeAttribute('class')
}
} else {
let cur = ` ${el.getAttribute('class') || ''} `
const tar = ' ' + cls + ' '
while (cur.indexOf(tar) >= 0) {
cur = cur.replace(tar, ' ')
}
cur = cur.trim()
if (cur) {
el.setAttribute('class', cur)
} else {
el.removeAttribute('class')
}
}
}