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export function setClasses(el, value) {
if (Array.isArray(value)) {
return setClassesFromString(el, value.join(' '))
} else if (typeof value === 'object' && value !== null) {
return setClassesFromObject(el, value)
} else if (typeof value === 'function') {
return setClasses(el, value())
}
return setClassesFromString(el, value)
}
function setClassesFromString(el, classString) {
let split = classString => classString.split(' ').filter(Boolean)
let missingClasses = classString => classString.split(' ').filter(i => ! el.classList.contains(i)).filter(Boolean)
let addClassesAndReturnUndo = classes => {
el.classList.add(...classes)
return () => { el.classList.remove(...classes) }
}
// This is to allow short-circuit expressions like: :class="show || 'hidden'" && "show && 'block'"
classString = (classString === true) ? classString = '' : (classString || '')
return addClassesAndReturnUndo(missingClasses(classString))
}
function setClassesFromObject(el, classObject) {
let split = classString => classString.split(' ').filter(Boolean)
let forAdd = Object.entries(classObject).flatMap(([classString, bool]) => bool ? split(classString) : false).filter(Boolean)
let forRemove = Object.entries(classObject).flatMap(([classString, bool]) => ! bool ? split(classString) : false).filter(Boolean)
let added = []
let removed = []
forRemove.forEach(i => {
if (el.classList.contains(i)) {
el.classList.remove(i)
removed.push(i)
}
})
forAdd.forEach(i => {
if (! el.classList.contains(i)) {
el.classList.add(i)
added.push(i)
}
})
return () => {
removed.forEach(i => el.classList.add(i))
added.forEach(i => el.classList.remove(i))
}
}
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