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attachNode.js
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attachNode.js
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/* eslint-env browser */
function attachNode (node, attachables) {
if (!node) { return }
if (!attachables) { return }
if (!Array.isArray(attachables)) {
attachables = [attachables]
}
let attached = false
for (let i = 0, iLen = attachables.length; i < iLen; ++i) {
const attachable = attachables[i]
const attachableObj = _toAttachableObj(attachable)
if (attachableObj) {
const entries = Object.entries(attachableObj)
for (let j = entries.length - 1; j >= 0; --j) {
const [action, nodeLikes] = entries[j]
const existingNode = _resolveNodeLikes(nodeLikes)
if (existingNode) {
if (action === 'after') {
if (existingNode.parentNode) {
existingNode.parentNode.insertBefore(node, existingNode.nextSibling)
attached = true
break
}
}
else if (action === 'endof') {
existingNode.appendChild(node)
attached = true
break
}
else if (action === 'before') {
if (existingNode.parentNode) {
existingNode.parentNode.insertBefore(node, existingNode)
attached = true
break
}
}
else if (action === 'startof') {
// existingNode.prepend(node) // Not in IE according to MDN
// existingNode.prependChild(node) // Does not exist
if (existingNode.firstChild) {
existingNode.insertBefore(node, existingNode.firstChild)
}
else {
existingNode.appendChild(node)
}
attached = true
break
}
}
}
}
if (attached) {
break
}
}
}
function _resolveNodeLikes (nodeLikes) {
let node
for (let i = 0, iLen = nodeLikes.length; i < iLen; ++i) {
const nodeLike = nodeLikes[i]
if (typeof nodeLike === 'string') {
node = document.querySelector(nodeLike)
}
else if (nodeLike instanceof Node) {
node = nodeLike
}
else if (typeof nodeLike === 'function') {
node = nodeLike()
}
if (node instanceof Node) {
return node
}
}
return node || null
}
const ATTACH_INFO = ['after', 'before', 'endof', 'startof'].map(
a => ({ a, p: a + '@', re: new RegExp(`^${a}@`) })
)
function _toAttachableObj (attachable) {
let attachableObj = attachable
const typeOfAttachable = typeof attachable
if (typeOfAttachable === 'string') {
for (let i = 0, iLen = ATTACH_INFO.length; i < iLen; ++i) {
const { a, p, re } = ATTACH_INFO[i]
if (attachable.startsWith(p)) {
const selector = attachable.replace(re, '').trim()
if (selector) {
attachableObj = { [a]: selector }
break
}
}
}
}
else if (typeOfAttachable === 'function') {
attachableObj = _toAttachableObj(attachable())
}
if (attachableObj && typeof attachableObj === 'object') {
const attachableObjEntries = Object.entries(attachableObj)
attachableObj = {}
for (let i = 0, iLen = attachableObjEntries.length; i < iLen; ++i) {
const [action, node] = attachableObjEntries[i]
const nodeLike = _toNodeLikes(node)
if (nodeLike) {
attachableObj[action] = nodeLike
}
}
}
else {
attachableObj = null
}
return attachableObj
}
function _toNodeLikes (node) {
let nodeLikes = node
if (!Array.isArray(node)) {
nodeLikes = [nodeLikes]
}
nodeLikes = nodeLikes.map(_toNodeLike)
return nodeLikes
}
function _toNodeLike (node) {
let nodeLike
const typeOfNode = typeof node
if (typeOfNode === 'string') {
nodeLike = node
}
else if (typeOfNode === 'function') {
nodeLike = _toNodeLike(node())
}
return nodeLike
}
export default attachNode