forked from alpinejs/alpine
-
Notifications
You must be signed in to change notification settings - Fork 2
/
morph.js
405 lines (295 loc) · 9.55 KB
/
morph.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
let resolveStep = () => {}
let logger = () => {}
function breakpoint(message) {
if (! debug) return
message && logger(message.replace('\n', '\\n'))
return new Promise(resolve => resolveStep = () => resolve())
}
export async function morph(from, toHtml, options) {
assignOptions(options)
let toEl = createElement(toHtml)
// If there is no x-data on the element we're morphing,
// let's seed it with the outer Alpine scope on the page.
if (window.Alpine && ! from._x_dataStack) {
toEl._x_dataStack = window.Alpine.closestDataStack(from)
toEl._x_dataStack && window.Alpine.clone(from, toEl)
}
await breakpoint()
patch(from, toEl)
return from
}
morph.step = () => resolveStep()
morph.log = (theLogger) => {
logger = theLogger
}
let key
,lookahead
,updating
,updated
,removing
,removed
,adding
,added
,debug
let noop = () => {}
function assignOptions(options = {}) {
let defaultGetKey = el => el.getAttribute('key')
updating = options.updating || noop
updated = options.updated || noop
removing = options.removing || noop
removed = options.removed || noop
adding = options.adding || noop
added = options.added || noop
key = options.key || defaultGetKey
lookahead = options.lookahead || true
debug = options.debug || false
}
function createElement(html) {
return document.createRange().createContextualFragment(html).firstElementChild
}
async function patch(from, to) {
// This is a time saver, however, it won't catch differences in nested <template> tags.
// I'm leaving this here as I believe it's an important speed improvement, I just
// don't see a way to enable it currently:
//
// if (from.isEqualNode(to)) return
if (differentElementNamesTypesOrKeys(from, to)) {
let result = patchElement(from, to)
await breakpoint('Swap elements')
return result
}
let updateChildrenOnly = false
if (shouldSkip(updating, from, to, () => updateChildrenOnly = true)) return
window.Alpine && initializeAlpineOnTo(from, to, () => updateChildrenOnly = true)
if (textOrComment(to)) {
await patchNodeValue(from, to)
updated(from, to)
return
}
if (! updateChildrenOnly) {
await patchAttributes(from, to)
}
updated(from, to)
await patchChildren(from, to)
}
function differentElementNamesTypesOrKeys(from, to) {
return from.nodeType != to.nodeType
|| from.nodeName != to.nodeName
|| getKey(from) != getKey(to)
}
function textOrComment(el) {
return el.nodeType === 3
|| el.nodeType === 8
}
function patchElement(from, to) {
if (shouldSkip(removing, from)) return
let toCloned = to.cloneNode(true)
if (shouldSkip(adding, toCloned)) return
dom(from).replace(toCloned)
removed(from)
added(toCloned)
}
async function patchNodeValue(from, to) {
let value = to.nodeValue
if (from.nodeValue !== value) {
from.nodeValue = value
await breakpoint('Change text node to: ' + value)
}
}
async function patchAttributes(from, to) {
if (from._x_isShown && ! to._x_isShown) {
return
}
if (! from._x_isShown && to._x_isShown) {
return
}
let domAttributes = Array.from(from.attributes)
let toAttributes = Array.from(to.attributes)
for (let i = domAttributes.length - 1; i >= 0; i--) {
let name = domAttributes[i].name;
if (! to.hasAttribute(name)) {
from.removeAttribute(name)
await breakpoint('Remove attribute')
}
}
for (let i = toAttributes.length - 1; i >= 0; i--) {
let name = toAttributes[i].name
let value = toAttributes[i].value
if (from.getAttribute(name) !== value) {
from.setAttribute(name, value)
await breakpoint(`Set [${name}] attribute to: "${value}"`)
}
}
}
async function patchChildren(from, to) {
let domChildren = from.childNodes
let toChildren = to.childNodes
let toKeyToNodeMap = keyToMap(toChildren)
let domKeyDomNodeMap = keyToMap(domChildren)
let currentTo = dom(to).nodes().first()
let currentFrom = dom(from).nodes().first()
let domKeyHoldovers = {}
while (currentTo) {
let toKey = getKey(currentTo)
let domKey = getKey(currentFrom)
// Add new elements
if (! currentFrom) {
if (toKey && domKeyHoldovers[toKey]) {
let holdover = domKeyHoldovers[toKey]
dom.append(from, holdover)
currentFrom = holdover
await breakpoint('Add element (from key)')
} else {
let added = addNodeTo(currentTo, from)
await breakpoint('Add element: ' + added.outerHTML || added.nodeValue)
currentTo = dom(currentTo).nodes().next()
continue
}
}
if (lookahead) {
let nextToElementSibling = dom(currentTo).next()
if (nextToElementSibling && currentFrom.isEqualNode(nextToElementSibling)) {
currentFrom = addNodeBefore(currentTo, currentFrom)
domKey = getKey(currentFrom)
await breakpoint('Move element (lookahead)')
}
}
if (toKey !== domKey) {
if (! toKey && domKey) {
domKeyHoldovers[domKey] = currentFrom
currentFrom = addNodeBefore(currentTo, currentFrom)
domKeyHoldovers[domKey].remove()
currentFrom = dom(currentFrom).nodes().next()
currentTo = dom(currentTo).nodes().next()
await breakpoint('No "to" key')
continue
}
if (toKey && ! domKey) {
if (domKeyDomNodeMap[toKey]) {
currentFrom = dom(currentFrom).replace(domKeyDomNodeMap[toKey])
await breakpoint('No "from" key')
}
}
if (toKey && domKey) {
domKeyHoldovers[domKey] = currentFrom
let domKeyNode = domKeyDomNodeMap[toKey]
if (domKeyNode) {
currentFrom = dom(currentFrom).replace(domKeyNode)
await breakpoint('Move "from" key')
} else {
domKeyHoldovers[domKey] = currentFrom
currentFrom = addNodeBefore(currentTo, currentFrom)
domKeyHoldovers[domKey].remove()
currentFrom = dom(currentFrom).next()
currentTo = dom(currentTo).next()
await breakpoint('I dont even know what this does')
continue
}
}
}
// Patch elements
await patch(currentFrom, currentTo)
currentTo = currentTo && dom(currentTo).next()
currentFrom = currentFrom && dom(currentFrom).next()
}
// Cleanup extra froms
while (currentFrom) {
if(! shouldSkip(removing, currentFrom)) {
let domForRemoval = currentFrom
domForRemoval.remove()
await breakpoint('remove el')
removed(domForRemoval)
}
currentFrom = dom(currentFrom).nodes().next()
}
}
function getKey(el) {
return el && el.nodeType === 1 && key(el)
}
function keyToMap(els) {
let map = {}
els.forEach(el => {
let theKey = getKey(el)
if (theKey) {
map[theKey] = el
}
})
return map
}
function shouldSkip(hook, ...args) {
let skip = false
hook(...args, () => skip = true)
return skip
}
function addNodeTo(node, parent) {
if(! shouldSkip(adding, node)) {
let clone = node.cloneNode(true)
dom(parent).append(clone)
added(clone)
return clone
}
}
function addNodeBefore(node, beforeMe) {
if(! shouldSkip(adding, node)) {
let clone = node.cloneNode(true)
dom(beforeMe).before(clone)
added(clone)
return clone
}
return beforeMe
}
function initializeAlpineOnTo(from, to, childrenOnly) {
if (from.nodeType !== 1) return
// If the element we are updating is an Alpine component...
if (from._x_dataStack) {
// Then temporarily clone it (with it's data) to the "to" element.
// This should simulate backend Livewire being aware of Alpine changes.
window.Alpine.clone(from, to)
}
}
function dom(el) {
return new DomManager(el)
}
class DomManager {
el = undefined
constructor(el) {
this.el = el
}
traversals = {
'first': 'firstChild',
'next': 'nextSibling',
'parent': 'parentElement',
}
nodes() {
this.traversals = {
'first': 'firstChild',
'next': 'nextSibling',
'parent': 'parentNode',
}; return this
}
first() {
return this.teleportTo(this.el[this.traversals['first']])
}
next() {
return this.teleportTo(this.teleportBack(this.el[this.traversals['next']]))
}
before(insertee) {
this.el[this.traversals['parent']].insertBefore(insertee, this.el); return insertee
}
replace(replacement) {
this.el[this.traversals['parent']].replaceChild(replacement, this.el); return replacement
}
append(appendee) {
this.el.appendChild(appendee); return appendee
}
teleportTo(el) {
if (! el) return el
if (el._x_teleport) return el._x_teleport
return el
}
teleportBack(el) {
if (! el) return el
if (el._x_teleportBack) return el._x_teleportBack
return el
}
}