| 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 |
10×
10×
10×
10×
10×
10×
10×
10×
10×
10×
10×
10×
21463×
28991×
28991×
11×
28991×
34×
28957×
7494×
7472×
7472×
7472×
7472×
22×
21463×
89×
21374×
4×
21463×
21463×
21463×
10×
21463×
21463×
21463×
21463×
17080×
17080×
27748×
27748×
1×
1×
1×
27747×
21463×
21463×
27803×
27803×
2×
2×
27741×
27742×
27742×
27739×
27739×
27739×
27739×
27739×
27803×
65×
65×
65×
1×
64×
65×
21463×
1×
1×
1×
8×
1×
23×
18×
18×
17×
1×
22×
22×
22×
22×
6×
16×
15×
5×
5×
10×
11×
11×
7×
21463×
21463×
19234×
15×
13922×
20354×
20354×
20354×
2213×
| 'use strict';
exports.__esModule = true;
exports['default'] = diff;
exports.removeOrphanedChildren = removeOrphanedChildren;
exports.recollectNodeTree = recollectNodeTree;
var _constants = require('../constants');
var _util = require('../util');
var _hooks = require('../hooks');
var _ = require('.');
var _functionalComponent = require('./functional-component');
var _component = require('./component');
var _dom = require('../dom');
var _domRecycler = require('../dom/recycler');
/** Apply differences in a given vnode (and it's deep children) to a real DOM Node.
* @param {Element} [dom=null] A DOM node to mutate into the shape of the `vnode`
* @param {VNode} vnode A VNode (with descendants forming a tree) representing the desired DOM structure
* @returns {Element} dom The created/mutated element
* @private
*/
function diff(dom, vnode, context) {
var originalAttributes = vnode.attributes;
while (_functionalComponent.isFunctionalComponent(vnode)) {
vnode = _functionalComponent.buildFunctionalComponent(vnode, context);
}
if (_util.isFunction(vnode.nodeName)) {
return _component.buildComponentFromVNode(dom, vnode, context);
}
if (_util.isString(vnode)) {
if (dom) {
var type = _dom.getNodeType(dom);
Eif (type === 3) {
dom[_constants.TEXT_CONTENT] = vnode;
return dom;
} else if (type === 1) {
_domRecycler.collectNode(dom);
}
}
return document.createTextNode(vnode);
}
// return diffNode(dom, vnode, context);
// }
/** Morph a DOM node to look like the given VNode. Creates DOM if it doesn't exist. */
// function diffNode(dom, vnode, context) {
var out = dom,
nodeName = vnode.nodeName || _constants.UNDEFINED_ELEMENT;
if (!dom) {
out = _domRecycler.createNode(nodeName);
} else if (_util.toLowerCase(dom.nodeName) !== nodeName) {
out = _domRecycler.createNode(nodeName);
// move children into the replacement node
_dom.appendChildren(out, _util.toArray(dom.childNodes));
// reclaim element nodes
recollectNodeTree(dom);
}
innerDiffNode(out, vnode, context);
diffAttributes(out, vnode);
if (originalAttributes && originalAttributes.ref) {
(out[_constants.ATTR_KEY].ref = originalAttributes.ref)(out);
}
return out;
}
/** Apply child and attribute changes between a VNode and a DOM Node to the DOM. */
function innerDiffNode(dom, vnode, context) {
var children = undefined,
keyed = undefined,
keyedLen = 0,
len = dom.childNodes.length,
childrenLen = 0;
if (len) {
children = [];
for (var i = 0; i < len; i++) {
var child = dom.childNodes[i],
key = child._component ? child._component.__key : _dom.getAccessor(child, 'key');
if (!_util.empty(key)) {
Eif (!keyed) keyed = {};
keyed[key] = child;
keyedLen++;
} else {
children[childrenLen++] = child;
}
}
}
var vchildren = vnode.children,
vlen = vchildren && vchildren.length,
min = 0;
if (vlen) {
for (var i = 0; i < vlen; i++) {
var vchild = vchildren[i],
child = undefined;
// if (isFunctionalComponent(vchild)) {
// vchild = buildFunctionalComponent(vchild);
// }
// attempt to find a node based on key matching
if (keyedLen) {
var attrs = vchild.attributes,
key = attrs && attrs.key;
Iif (!_util.empty(key) && _util.hasOwnProperty.call(keyed, key)) {
child = keyed[key];
keyed[key] = null;
keyedLen--;
}
}
// attempt to pluck a node of the same type from the existing children
if (!child && min < childrenLen) {
for (var j = min; j < childrenLen; j++) {
var c = children[j];
if (c && _.isSameNodeType(c, vchild)) {
child = c;
children[j] = null;
if (j === childrenLen - 1) childrenLen--;
if (j === min) min++;
break;
}
}
}
// morph the matched/found/created DOM child to match vchild (deep)
child = diff(child, vchild, context);
if (dom.childNodes[i] !== child) {
var c = child.parentNode !== dom && child._component,
next = dom.childNodes[i + 1];
if (c) _hooks.deepHook(c, 'componentWillMount');
if (next) {
dom.insertBefore(child, next);
} else {
dom.appendChild(child);
}
if (c) _hooks.deepHook(c, 'componentDidMount');
}
}
}
if (keyedLen) {
/*eslint guard-for-in:0*/
for (var i in keyed) {
Eif (_util.hasOwnProperty.call(keyed, i) && keyed[i]) {
children[min = childrenLen++] = keyed[i];
}
}
}
// remove orphaned children
if (min < childrenLen) {
removeOrphanedChildren(children);
}
}
/** Reclaim children that were unreferenced in the desired VTree */
function removeOrphanedChildren(children, unmountOnly) {
for (var i = children.length; i--;) {
var child = children[i];
if (child) {
recollectNodeTree(child, unmountOnly);
}
}
}
/** Reclaim an entire tree of nodes, starting at the root. */
function recollectNodeTree(node, unmountOnly) {
// @TODO: Need to make a call on whether Preact should remove nodes not created by itself.
// Currently it *does* remove them. Discussion: https://github.com/developit/preact/issues/39
//if (!node[ATTR_KEY]) return;
var attrs = node[_constants.ATTR_KEY];
if (attrs) _hooks.hook(attrs, 'ref', null);
var component = node._component;
if (component) {
_component.unmountComponent(component, !unmountOnly);
} else {
if (!unmountOnly) {
if (_dom.getNodeType(node) !== 1) {
_dom.removeNode(node);
return;
}
_domRecycler.collectNode(node);
}
var c = node.childNodes;
if (c && c.length) {
removeOrphanedChildren(c, unmountOnly);
}
}
}
/** Apply differences in attributes from a VNode to the given DOM Node. */
function diffAttributes(dom, vnode) {
var old = _dom.getNodeAttributes(dom) || _constants.EMPTY,
attrs = vnode.attributes || _constants.EMPTY,
name = undefined,
value = undefined;
// removed
for (name in old) {
if (_util.empty(attrs[name])) {
_dom.setAccessor(dom, name, null);
}
}
// new & updated
if (attrs !== _constants.EMPTY) {
for (name in attrs) {
Eif (_util.hasOwnProperty.call(attrs, name)) {
value = attrs[name];
if (!_util.empty(value) && value != _dom.getAccessor(dom, name)) {
_dom.setAccessor(dom, name, value);
}
}
}
}
}
|