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| 'use strict';
exports.__esModule = true;
exports.flushMounts = flushMounts;
exports.diff = diff;
exports.removeOrphanedChildren = removeOrphanedChildren;
exports.recollectNodeTree = recollectNodeTree;
var _constants = require('../constants');
var _util = require('../util');
var _hooks = require('../hooks');
var _index = require('./index');
var _functionalComponent = require('./functional-component');
var _component = require('./component');
var _domIndex = require('../dom/index');
var _domRecycler = require('../dom/recycler');
/** Diff recursion count, used to track the end of the diff cycle. */
var mounts = [];
exports.mounts = mounts;
/** Diff recursion count, used to track the end of the diff cycle. */
var diffLevel = 0;
exports.diffLevel = diffLevel;
var isSvgMode = false;
function flushMounts() {
var c = undefined;
while (c = mounts.pop()) _hooks.hook(c, 'componentDidMount');
}
/** 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, mountAll, unmountChildrenOnly, parent) {
exports.diffLevel = diffLevel += 1;
var ret = idiff(dom, vnode, context, mountAll, unmountChildrenOnly);
if (parent && ret.parentNode !== parent) parent.appendChild(ret);
if (!(exports.diffLevel = diffLevel -= 1)) flushMounts();
return ret;
}
function idiff(dom, vnode, context, mountAll, unmountChildrenOnly) {
var originalAttributes = vnode.attributes;
while (_functionalComponent.isFunctionalComponent(vnode)) {
vnode = _functionalComponent.buildFunctionalComponent(vnode, context);
}
if (_util.isString(vnode)) {
if (dom) {
if (_domIndex.getNodeType(dom) === 3) {
if (dom.nodeValue !== vnode) {
dom.nodeValue = vnode;
}
return dom;
}
if (!unmountChildrenOnly) _domRecycler.collectNode(dom);
}
return document.createTextNode(vnode);
}
var out = dom,
nodeName = vnode.nodeName,
svgMode = undefined;
if (_util.isFunction(nodeName)) {
return _component.buildComponentFromVNode(dom, vnode, context, mountAll);
}
Iif (!_util.isString(nodeName)) {
nodeName = String(nodeName);
}
svgMode = _util.toLowerCase(nodeName) === 'svg';
if (svgMode) isSvgMode = true;
if (!dom) {
out = _domRecycler.createNode(nodeName, isSvgMode);
} else if (!_index.isNamedNode(dom, nodeName)) {
out = _domRecycler.createNode(nodeName, isSvgMode);
// move children into the replacement node
while (dom.firstChild) out.appendChild(dom.firstChild);
// reclaim element nodes
if (!unmountChildrenOnly) recollectNodeTree(dom);
}
// fast-path for elements containing a single TextNode:
if (vnode.children && vnode.children.length === 1 && typeof vnode.children[0] === 'string' && out.childNodes.length === 1 && out.firstChild instanceof Text) {
out.firstChild.nodeValue = vnode.children[0];
} else if (vnode.children || out.firstChild) {
innerDiffNode(out, vnode.children, context, mountAll);
}
diffAttributes(out, vnode.attributes);
if (originalAttributes && originalAttributes.ref) {
(out[_constants.ATTR_KEY].ref = originalAttributes.ref)(out);
}
if (svgMode) isSvgMode = false;
return out;
}
/** Apply child and attribute changes between a VNode and a DOM Node to the DOM. */
function innerDiffNode(dom, vchildren, context, mountAll) {
var originalChildren = dom.childNodes,
children = [],
keyed = {},
keyedLen = 0,
min = 0,
len = originalChildren.length,
childrenLen = 0,
vlen = vchildren && vchildren.length,
j = undefined,
c = undefined,
vchild = undefined,
child = undefined;
if (len) {
for (var i = 0; i < len; i++) {
var _child = originalChildren[i],
key = vlen && ((c = _child._component) ? c.__key : (c = _child[_constants.ATTR_KEY]) ? c.key : null);
if (key || key === 0) {
keyedLen++;
keyed[key] = _child;
} else {
children[childrenLen++] = _child;
}
}
}
if (vlen) {
for (var i = 0; i < vlen; i++) {
vchild = vchildren[i];
child = null;
// if (isFunctionalComponent(vchild)) {
// vchild = buildFunctionalComponent(vchild);
// }
// attempt to find a node based on key matching
if (keyedLen && vchild.attributes) {
var key = vchild.key;
Iif (!_util.empty(key) && key in keyed) {
child = keyed[key];
keyed[key] = undefined;
keyedLen--;
}
}
// attempt to pluck a node of the same type from the existing children
if (!child && min < childrenLen) {
for (j = min; j < childrenLen; j++) {
c = children[j];
if (c && _index.isSameNodeType(c, vchild)) {
child = c;
children[j] = undefined;
if (j === childrenLen - 1) childrenLen--;
if (j === min) min++;
break;
}
}
}
// morph the matched/found/created DOM child to match vchild (deep)
child = idiff(child, vchild, context, mountAll);
if (child !== originalChildren[i]) {
dom.insertBefore(child, originalChildren[i] || null);
}
}
}
if (keyedLen) {
/*eslint guard-for-in:0*/
for (var i in keyed) {
Eif (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 component = node._component;
if (component) {
_component.unmountComponent(component, !unmountOnly);
} else {
if (node[_constants.ATTR_KEY]) _hooks.hook(node[_constants.ATTR_KEY], 'ref', null);
Eif (!unmountOnly) {
if (_domIndex.getNodeType(node) !== 1) {
_domIndex.removeNode(node);
return;
}
_domRecycler.collectNode(node);
}
if (node.childNodes.length) {
removeOrphanedChildren(node.childNodes, unmountOnly);
}
}
}
/** Apply differences in attributes from a VNode to the given DOM Node. */
function diffAttributes(dom, attrs) {
var old = dom[_constants.ATTR_KEY] || _domIndex.getRawNodeAttributes(dom);
// removeAttributes(dom, old, attrs || EMPTY);
for (var _name in old) {
if (!attrs || !(_name in attrs)) {
_domIndex.setAccessor(dom, _name, null, isSvgMode);
}
}
// new & updated
if (attrs) {
for (var _name2 in attrs) {
if (!(_name2 in old) || attrs[_name2] != (_name2 === 'value' || _name2 === 'selected' || _name2 === 'checked' ? dom[_name2] : old[_name2])) {
_domIndex.setAccessor(dom, _name2, attrs[_name2], old[_name2], isSvgMode);
}
}
}
}
|