snabbdom
Version:
A virtual DOM library with focus on simplicity, modularity, powerful features and performance.
390 lines • 16.3 kB
JavaScript
import { vnode } from "./vnode.js";
import * as is from "./is.js";
import { htmlDomApi } from "./htmldomapi.js";
function isUndef(s) {
return s === undefined;
}
function isDef(s) {
return s !== undefined;
}
const emptyNode = vnode("", {}, [], undefined, undefined);
function sameVnode(vnode1, vnode2) {
var _a, _b;
const isSameKey = vnode1.key === vnode2.key;
const isSameIs = ((_a = vnode1.data) === null || _a === void 0 ? void 0 : _a.is) === ((_b = vnode2.data) === null || _b === void 0 ? void 0 : _b.is);
const isSameSel = vnode1.sel === vnode2.sel;
const isSameTextOrFragment = !vnode1.sel && vnode1.sel === vnode2.sel
? typeof vnode1.text === typeof vnode2.text
: true;
return isSameSel && isSameKey && isSameIs && isSameTextOrFragment;
}
/**
* @todo Remove this function when the document fragment is considered stable.
*/
function documentFragmentIsNotSupported() {
throw new Error("The document fragment is not supported on this platform.");
}
function isElement(api, vnode) {
return api.isElement(vnode);
}
function isDocumentFragment(api, vnode) {
return api.isDocumentFragment(vnode);
}
function createKeyToOldIdx(children, beginIdx, endIdx) {
var _a;
const map = {};
for (let i = beginIdx; i <= endIdx; ++i) {
const key = (_a = children[i]) === null || _a === void 0 ? void 0 : _a.key;
if (key !== undefined) {
map[key] = i;
}
}
return map;
}
const hooks = [
"create",
"update",
"remove",
"destroy",
"pre",
"post"
];
export function init(modules, domApi, options) {
const cbs = {
create: [],
update: [],
remove: [],
destroy: [],
pre: [],
post: []
};
const api = domApi !== undefined ? domApi : htmlDomApi;
for (const hook of hooks) {
for (const module of modules) {
const currentHook = module[hook];
if (currentHook !== undefined) {
cbs[hook].push(currentHook);
}
}
}
function emptyNodeAt(elm) {
const id = elm.id ? "#" + elm.id : "";
// elm.className doesn't return a string when elm is an SVG element inside a shadowRoot.
// https://stackoverflow.com/questions/29454340/detecting-classname-of-svganimatedstring
const classes = elm.getAttribute("class");
const c = classes ? "." + classes.split(" ").join(".") : "";
return vnode(api.tagName(elm).toLowerCase() + id + c, {}, [], undefined, elm);
}
function emptyDocumentFragmentAt(frag) {
return vnode(undefined, {}, [], undefined, frag);
}
function createRmCb(childElm, listeners) {
return function rmCb() {
if (--listeners === 0) {
const parent = api.parentNode(childElm);
if (parent !== null) {
api.removeChild(parent, childElm);
}
}
};
}
function createElm(vnode, insertedVnodeQueue) {
var _a, _b, _c, _d;
let i;
let data = vnode.data;
if (data !== undefined) {
const init = (_a = data.hook) === null || _a === void 0 ? void 0 : _a.init;
if (isDef(init)) {
init(vnode);
data = vnode.data;
}
}
const children = vnode.children;
const sel = vnode.sel;
if (sel === "!") {
if (isUndef(vnode.text)) {
vnode.text = "";
}
vnode.elm = api.createComment(vnode.text);
}
else if (sel === "") {
// textNode has no selector
vnode.elm = api.createTextNode(vnode.text);
}
else if (sel !== undefined) {
// Parse selector
const hashIdx = sel.indexOf("#");
const dotIdx = sel.indexOf(".", hashIdx);
const hash = hashIdx > 0 ? hashIdx : sel.length;
const dot = dotIdx > 0 ? dotIdx : sel.length;
const tag = hashIdx !== -1 || dotIdx !== -1
? sel.slice(0, Math.min(hash, dot))
: sel;
const elm = (vnode.elm =
isDef(data) && isDef((i = data.ns))
? api.createElementNS(i, tag, data)
: api.createElement(tag, data));
if (hash < dot)
elm.setAttribute("id", sel.slice(hash + 1, dot));
if (dotIdx > 0)
elm.setAttribute("class", sel.slice(dot + 1).replace(/\./g, " "));
for (i = 0; i < cbs.create.length; ++i)
cbs.create[i](emptyNode, vnode);
if (is.primitive(vnode.text) &&
(!is.array(children) || children.length === 0)) {
// allow h1 and similar nodes to be created w/ text and empty child list
api.appendChild(elm, api.createTextNode(vnode.text));
}
if (is.array(children)) {
for (i = 0; i < children.length; ++i) {
const ch = children[i];
if (ch != null) {
api.appendChild(elm, createElm(ch, insertedVnodeQueue));
}
}
}
const hook = vnode.data.hook;
if (isDef(hook)) {
(_b = hook.create) === null || _b === void 0 ? void 0 : _b.call(hook, emptyNode, vnode);
if (hook.insert) {
insertedVnodeQueue.push(vnode);
}
}
}
else if (((_c = options === null || options === void 0 ? void 0 : options.experimental) === null || _c === void 0 ? void 0 : _c.fragments) && vnode.children) {
vnode.elm = ((_d = api.createDocumentFragment) !== null && _d !== void 0 ? _d : documentFragmentIsNotSupported)();
for (i = 0; i < cbs.create.length; ++i)
cbs.create[i](emptyNode, vnode);
for (i = 0; i < vnode.children.length; ++i) {
const ch = vnode.children[i];
if (ch != null) {
api.appendChild(vnode.elm, createElm(ch, insertedVnodeQueue));
}
}
}
else {
vnode.elm = api.createTextNode(vnode.text);
}
return vnode.elm;
}
function addVnodes(parentElm, before, vnodes, startIdx, endIdx, insertedVnodeQueue) {
for (; startIdx <= endIdx; ++startIdx) {
const ch = vnodes[startIdx];
if (ch != null) {
api.insertBefore(parentElm, createElm(ch, insertedVnodeQueue), before);
}
}
}
function invokeDestroyHook(vnode) {
var _a, _b;
const data = vnode.data;
if (data !== undefined) {
(_b = (_a = data === null || data === void 0 ? void 0 : data.hook) === null || _a === void 0 ? void 0 : _a.destroy) === null || _b === void 0 ? void 0 : _b.call(_a, vnode);
for (let i = 0; i < cbs.destroy.length; ++i)
cbs.destroy[i](vnode);
if (vnode.children !== undefined) {
for (let j = 0; j < vnode.children.length; ++j) {
const child = vnode.children[j];
if (child != null && typeof child !== "string") {
invokeDestroyHook(child);
}
}
}
}
}
function removeVnodes(parentElm, vnodes, startIdx, endIdx) {
var _a, _b;
for (; startIdx <= endIdx; ++startIdx) {
let listeners;
let rm;
const ch = vnodes[startIdx];
if (ch != null) {
if (isDef(ch.sel)) {
invokeDestroyHook(ch);
listeners = cbs.remove.length + 1;
rm = createRmCb(ch.elm, listeners);
for (let i = 0; i < cbs.remove.length; ++i)
cbs.remove[i](ch, rm);
const removeHook = (_b = (_a = ch === null || ch === void 0 ? void 0 : ch.data) === null || _a === void 0 ? void 0 : _a.hook) === null || _b === void 0 ? void 0 : _b.remove;
if (isDef(removeHook)) {
removeHook(ch, rm);
}
else {
rm();
}
}
else if (ch.children) {
// Fragment node
invokeDestroyHook(ch);
removeVnodes(parentElm, ch.children, 0, ch.children.length - 1);
}
else {
// Text node
api.removeChild(parentElm, ch.elm);
}
}
}
}
function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue) {
let oldStartIdx = 0;
let newStartIdx = 0;
let oldEndIdx = oldCh.length - 1;
let oldStartVnode = oldCh[0];
let oldEndVnode = oldCh[oldEndIdx];
let newEndIdx = newCh.length - 1;
let newStartVnode = newCh[0];
let newEndVnode = newCh[newEndIdx];
let oldKeyToIdx;
let idxInOld;
let elmToMove;
let before;
while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
if (oldStartVnode == null) {
oldStartVnode = oldCh[++oldStartIdx]; // Vnode might have been moved left
}
else if (oldEndVnode == null) {
oldEndVnode = oldCh[--oldEndIdx];
}
else if (newStartVnode == null) {
newStartVnode = newCh[++newStartIdx];
}
else if (newEndVnode == null) {
newEndVnode = newCh[--newEndIdx];
}
else if (sameVnode(oldStartVnode, newStartVnode)) {
patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
oldStartVnode = oldCh[++oldStartIdx];
newStartVnode = newCh[++newStartIdx];
}
else if (sameVnode(oldEndVnode, newEndVnode)) {
patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
oldEndVnode = oldCh[--oldEndIdx];
newEndVnode = newCh[--newEndIdx];
}
else if (sameVnode(oldStartVnode, newEndVnode)) {
// Vnode moved right
patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
api.insertBefore(parentElm, oldStartVnode.elm, api.nextSibling(oldEndVnode.elm));
oldStartVnode = oldCh[++oldStartIdx];
newEndVnode = newCh[--newEndIdx];
}
else if (sameVnode(oldEndVnode, newStartVnode)) {
// Vnode moved left
patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
api.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
oldEndVnode = oldCh[--oldEndIdx];
newStartVnode = newCh[++newStartIdx];
}
else {
if (oldKeyToIdx === undefined) {
oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
}
idxInOld = oldKeyToIdx[newStartVnode.key];
if (isUndef(idxInOld)) {
// `newStartVnode` is new, create and insert it in beginning
api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm);
newStartVnode = newCh[++newStartIdx];
}
else if (isUndef(oldKeyToIdx[newEndVnode.key])) {
// `newEndVnode` is new, create and insert it in the end
api.insertBefore(parentElm, createElm(newEndVnode, insertedVnodeQueue), api.nextSibling(oldEndVnode.elm));
newEndVnode = newCh[--newEndIdx];
}
else {
// Neither of the new endpoints are new vnodes, so we make progress by
// moving `newStartVnode` into position
elmToMove = oldCh[idxInOld];
if (elmToMove.sel !== newStartVnode.sel) {
api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm);
}
else {
patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
oldCh[idxInOld] = undefined;
api.insertBefore(parentElm, elmToMove.elm, oldStartVnode.elm);
}
newStartVnode = newCh[++newStartIdx];
}
}
}
if (newStartIdx <= newEndIdx) {
before = newCh[newEndIdx + 1] == null ? null : newCh[newEndIdx + 1].elm;
addVnodes(parentElm, before, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
}
if (oldStartIdx <= oldEndIdx) {
removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
}
}
function patchVnode(oldVnode, vnode, insertedVnodeQueue) {
var _a, _b, _c, _d, _e, _f, _g, _h;
const hook = (_a = vnode.data) === null || _a === void 0 ? void 0 : _a.hook;
(_b = hook === null || hook === void 0 ? void 0 : hook.prepatch) === null || _b === void 0 ? void 0 : _b.call(hook, oldVnode, vnode);
const elm = (vnode.elm = oldVnode.elm);
if (oldVnode === vnode)
return;
if (vnode.data !== undefined ||
(isDef(vnode.text) && vnode.text !== oldVnode.text)) {
(_c = vnode.data) !== null && _c !== void 0 ? _c : (vnode.data = {});
(_d = oldVnode.data) !== null && _d !== void 0 ? _d : (oldVnode.data = {});
for (let i = 0; i < cbs.update.length; ++i)
cbs.update[i](oldVnode, vnode);
(_g = (_f = (_e = vnode.data) === null || _e === void 0 ? void 0 : _e.hook) === null || _f === void 0 ? void 0 : _f.update) === null || _g === void 0 ? void 0 : _g.call(_f, oldVnode, vnode);
}
const oldCh = oldVnode.children;
const ch = vnode.children;
if (isUndef(vnode.text)) {
if (isDef(oldCh) && isDef(ch)) {
if (oldCh !== ch)
updateChildren(elm, oldCh, ch, insertedVnodeQueue);
}
else if (isDef(ch)) {
if (isDef(oldVnode.text))
api.setTextContent(elm, "");
addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
}
else if (isDef(oldCh)) {
removeVnodes(elm, oldCh, 0, oldCh.length - 1);
}
else if (isDef(oldVnode.text)) {
api.setTextContent(elm, "");
}
}
else if (oldVnode.text !== vnode.text) {
if (isDef(oldCh)) {
removeVnodes(elm, oldCh, 0, oldCh.length - 1);
}
api.setTextContent(elm, vnode.text);
}
(_h = hook === null || hook === void 0 ? void 0 : hook.postpatch) === null || _h === void 0 ? void 0 : _h.call(hook, oldVnode, vnode);
}
return function patch(oldVnode, vnode) {
let i, elm, parent;
const insertedVnodeQueue = [];
for (i = 0; i < cbs.pre.length; ++i)
cbs.pre[i]();
if (isElement(api, oldVnode)) {
oldVnode = emptyNodeAt(oldVnode);
}
else if (isDocumentFragment(api, oldVnode)) {
oldVnode = emptyDocumentFragmentAt(oldVnode);
}
if (sameVnode(oldVnode, vnode)) {
patchVnode(oldVnode, vnode, insertedVnodeQueue);
}
else {
elm = oldVnode.elm;
parent = api.parentNode(elm);
createElm(vnode, insertedVnodeQueue);
if (parent !== null) {
api.insertBefore(parent, vnode.elm, api.nextSibling(elm));
removeVnodes(parent, [oldVnode], 0, 0);
}
}
for (i = 0; i < insertedVnodeQueue.length; ++i) {
insertedVnodeQueue[i].data.hook.insert(insertedVnodeQueue[i]);
}
for (i = 0; i < cbs.post.length; ++i)
cbs.post[i]();
return vnode;
};
}
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