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388 lines
7.9 KiB
388 lines
7.9 KiB
'use strict';
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const Map = (require('@ungap/essential-map'));
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const {indexOf: iOF} = [];
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const append = (get, parent, children, start, end, before) => {
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const isSelect = 'selectedIndex' in parent;
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let noSelection = isSelect;
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while (start < end) {
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const child = get(children[start], 1);
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parent.insertBefore(child, before);
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if (isSelect && noSelection && child.selected) {
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noSelection = !noSelection;
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let {selectedIndex} = parent;
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parent.selectedIndex = selectedIndex < 0 ?
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start :
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iOF.call(parent.querySelectorAll('option'), child);
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}
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start++;
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}
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};
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exports.append = append;
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const eqeq = (a, b) => a == b;
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exports.eqeq = eqeq;
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const identity = O => O;
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exports.identity = identity;
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const indexOf = (
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moreNodes,
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moreStart,
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moreEnd,
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lessNodes,
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lessStart,
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lessEnd,
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compare
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) => {
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const length = lessEnd - lessStart;
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/* istanbul ignore if */
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if (length < 1)
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return -1;
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while ((moreEnd - moreStart) >= length) {
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let m = moreStart;
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let l = lessStart;
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while (
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m < moreEnd &&
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l < lessEnd &&
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compare(moreNodes[m], lessNodes[l])
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) {
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m++;
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l++;
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}
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if (l === lessEnd)
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return moreStart;
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moreStart = m + 1;
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}
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return -1;
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};
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exports.indexOf = indexOf;
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const isReversed = (
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futureNodes,
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futureEnd,
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currentNodes,
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currentStart,
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currentEnd,
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compare
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) => {
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while (
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currentStart < currentEnd &&
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compare(
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currentNodes[currentStart],
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futureNodes[futureEnd - 1]
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)) {
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currentStart++;
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futureEnd--;
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};
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return futureEnd === 0;
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};
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exports.isReversed = isReversed;
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const next = (get, list, i, length, before) => i < length ?
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get(list[i], 0) :
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(0 < i ?
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get(list[i - 1], -0).nextSibling :
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before);
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exports.next = next;
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const remove = (get, parent, children, start, end) => {
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if ((end - start) < 2)
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parent.removeChild(get(children[start], -1));
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else {
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const range = parent.ownerDocument.createRange();
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range.setStartBefore(get(children[start], -1));
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range.setEndAfter(get(children[end - 1], -1));
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range.deleteContents();
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}
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};
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exports.remove = remove;
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// - - - - - - - - - - - - - - - - - - -
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// diff related constants and utilities
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// - - - - - - - - - - - - - - - - - - -
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const DELETION = -1;
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const INSERTION = 1;
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const SKIP = 0;
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const SKIP_OND = 50;
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const HS = (
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futureNodes,
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futureStart,
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futureEnd,
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futureChanges,
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currentNodes,
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currentStart,
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currentEnd,
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currentChanges
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) => {
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let k = 0;
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/* istanbul ignore next */
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let minLen = futureChanges < currentChanges ? futureChanges : currentChanges;
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const link = Array(minLen++);
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const tresh = Array(minLen);
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tresh[0] = -1;
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for (let i = 1; i < minLen; i++)
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tresh[i] = currentEnd;
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const keymap = new Map;
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for (let i = currentStart; i < currentEnd; i++)
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keymap.set(currentNodes[i], i);
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for (let i = futureStart; i < futureEnd; i++) {
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const idxInOld = keymap.get(futureNodes[i]);
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if (idxInOld != null) {
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k = findK(tresh, minLen, idxInOld);
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/* istanbul ignore else */
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if (-1 < k) {
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tresh[k] = idxInOld;
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link[k] = {
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newi: i,
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oldi: idxInOld,
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prev: link[k - 1]
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};
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}
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}
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}
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k = --minLen;
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--currentEnd;
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while (tresh[k] > currentEnd) --k;
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minLen = currentChanges + futureChanges - k;
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const diff = Array(minLen);
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let ptr = link[k];
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--futureEnd;
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while (ptr) {
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const {newi, oldi} = ptr;
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while (futureEnd > newi) {
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diff[--minLen] = INSERTION;
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--futureEnd;
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}
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while (currentEnd > oldi) {
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diff[--minLen] = DELETION;
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--currentEnd;
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}
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diff[--minLen] = SKIP;
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--futureEnd;
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--currentEnd;
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ptr = ptr.prev;
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}
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while (futureEnd >= futureStart) {
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diff[--minLen] = INSERTION;
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--futureEnd;
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}
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while (currentEnd >= currentStart) {
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diff[--minLen] = DELETION;
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--currentEnd;
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}
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return diff;
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};
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// this is pretty much the same petit-dom code without the delete map part
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// https://github.com/yelouafi/petit-dom/blob/bd6f5c919b5ae5297be01612c524c40be45f14a7/src/vdom.js#L556-L561
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const OND = (
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futureNodes,
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futureStart,
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rows,
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currentNodes,
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currentStart,
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cols,
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compare
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) => {
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const length = rows + cols;
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const v = [];
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let d, k, r, c, pv, cv, pd;
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outer: for (d = 0; d <= length; d++) {
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/* istanbul ignore if */
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if (d > SKIP_OND)
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return null;
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pd = d - 1;
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/* istanbul ignore next */
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pv = d ? v[d - 1] : [0, 0];
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cv = v[d] = [];
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for (k = -d; k <= d; k += 2) {
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if (k === -d || (k !== d && pv[pd + k - 1] < pv[pd + k + 1])) {
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c = pv[pd + k + 1];
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} else {
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c = pv[pd + k - 1] + 1;
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}
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r = c - k;
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while (
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c < cols &&
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r < rows &&
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compare(
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currentNodes[currentStart + c],
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futureNodes[futureStart + r]
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)
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) {
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c++;
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r++;
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}
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if (c === cols && r === rows) {
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break outer;
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}
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cv[d + k] = c;
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}
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}
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const diff = Array(d / 2 + length / 2);
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let diffIdx = diff.length - 1;
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for (d = v.length - 1; d >= 0; d--) {
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while (
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c > 0 &&
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r > 0 &&
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compare(
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currentNodes[currentStart + c - 1],
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futureNodes[futureStart + r - 1]
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)
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) {
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// diagonal edge = equality
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diff[diffIdx--] = SKIP;
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c--;
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r--;
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}
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if (!d)
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break;
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pd = d - 1;
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/* istanbul ignore next */
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pv = d ? v[d - 1] : [0, 0];
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k = c - r;
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if (k === -d || (k !== d && pv[pd + k - 1] < pv[pd + k + 1])) {
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// vertical edge = insertion
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r--;
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diff[diffIdx--] = INSERTION;
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} else {
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// horizontal edge = deletion
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c--;
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diff[diffIdx--] = DELETION;
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}
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}
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return diff;
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};
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const applyDiff = (
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diff,
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get,
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parentNode,
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futureNodes,
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futureStart,
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currentNodes,
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currentStart,
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currentLength,
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before
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) => {
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const live = new Map;
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const length = diff.length;
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let currentIndex = currentStart;
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let i = 0;
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while (i < length) {
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switch (diff[i++]) {
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case SKIP:
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futureStart++;
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currentIndex++;
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break;
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case INSERTION:
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// TODO: bulk appends for sequential nodes
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live.set(futureNodes[futureStart], 1);
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append(
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get,
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parentNode,
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futureNodes,
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futureStart++,
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futureStart,
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currentIndex < currentLength ?
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get(currentNodes[currentIndex], 0) :
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before
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);
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break;
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case DELETION:
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currentIndex++;
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break;
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}
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}
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i = 0;
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while (i < length) {
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switch (diff[i++]) {
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case SKIP:
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currentStart++;
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break;
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case DELETION:
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// TODO: bulk removes for sequential nodes
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if (live.has(currentNodes[currentStart]))
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currentStart++;
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else
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remove(
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get,
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parentNode,
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currentNodes,
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currentStart++,
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currentStart
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);
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break;
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}
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}
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};
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const findK = (ktr, length, j) => {
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let lo = 1;
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let hi = length;
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while (lo < hi) {
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const mid = ((lo + hi) / 2) >>> 0;
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if (j < ktr[mid])
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hi = mid;
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else
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lo = mid + 1;
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}
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return lo;
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}
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const smartDiff = (
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get,
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parentNode,
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futureNodes,
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futureStart,
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futureEnd,
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futureChanges,
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currentNodes,
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currentStart,
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currentEnd,
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currentChanges,
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currentLength,
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compare,
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before
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) => {
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applyDiff(
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OND(
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futureNodes,
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futureStart,
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futureChanges,
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currentNodes,
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currentStart,
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currentChanges,
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compare
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) ||
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HS(
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futureNodes,
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futureStart,
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futureEnd,
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futureChanges,
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currentNodes,
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currentStart,
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currentEnd,
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currentChanges
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),
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get,
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parentNode,
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futureNodes,
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futureStart,
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currentNodes,
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currentStart,
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currentLength,
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before
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);
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};
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exports.smartDiff = smartDiff;
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