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Engine.js
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45 lines (45 loc) · 1.21 KB
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export default {
update: (
utils,
liveNodes, liveStart, liveEnd, liveLength,
virtualNodes, virtualStart, virtualEnd /*, virtualLength */
) => {
const { splicer } = utils;
while (liveStart < liveEnd && virtualStart < virtualEnd) {
const liveValue = liveNodes[liveStart];
const virtualValue = virtualNodes[virtualStart];
const status = liveValue === virtualValue ?
0 : (liveNodes.indexOf(virtualValue) < 0 ? 1 : -1);
// nodes can be either removed ...
if (status < 0) {
splicer.splice(liveStart, 1);
liveEnd--;
liveLength--;
}
// ... appended ...
else if (0 < status) {
splicer.splice(liveStart, 0, virtualValue);
liveStart++;
liveEnd++;
liveLength++;
virtualStart++;
}
// ... or ignored, since it's the same ...
else {
liveStart++;
virtualStart++;
}
}
if (liveStart < liveEnd) {
splicer.splice(liveStart, liveEnd - liveStart);
}
if (virtualStart < virtualEnd) {
splicer.splice.apply(
splicer,
[liveEnd, 0].concat(
virtualNodes.slice(virtualStart, virtualEnd)
)
);
}
}
};