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var CAPS_REGEX = /[A-Z]/g;
function updateDataset(oldVnode, vnode) {
var elm = vnode.elm,
oldDataset = oldVnode.data.dataset,
dataset = vnode.data.dataset,
key;
if (!oldDataset && !dataset) return;
if (oldDataset === dataset) return;
oldDataset = oldDataset || {};
dataset = dataset || {};
var d = elm.dataset;
for (key in oldDataset) {
if (!dataset[key]) {
if (d) {
if (key in d) {
delete d[key];
}
} else {
elm.removeAttribute('data-' + key.replace(CAPS_REGEX, '-$&').toLowerCase());
}
}
}
for (key in dataset) {
if (oldDataset[key] !== dataset[key]) {
if (d) {
d[key] = dataset[key];
} else {
elm.setAttribute('data-' + key.replace(CAPS_REGEX, '-$&').toLowerCase(), dataset[key]);
}
}
}
}
export var datasetModule = {
create: updateDataset,
update: updateDataset
};
export default datasetModule;