blob: 03c756feec7c9ba9d89507ba2ed8fbd967fce363 (
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"use strict";
var nil = {}
var owns = ({}).hasOwnProperty
function rebase(result, parent, delta) {
var key, current, previous, update
for (key in parent) {
if (owns.call(parent, key)) {
previous = parent[key]
update = owns.call(delta, key) ? delta[key] : nil
if (previous === null) continue
else if (previous === void(0)) continue
else if (update === null) continue
else if (update === void(0)) continue
else result[key] = previous
}
}
for (key in delta) {
if (owns.call(delta, key)) {
update = delta[key]
current = owns.call(result, key) ? result[key] : nil
if (current === update) continue
else if (update === null) continue
else if (update === void(0)) continue
else if (current === nil) result[key] = update
else if (typeof(update) !== "object") result[key] = update
else if (typeof(current) !== "object") result[key] = update
else result[key]= rebase({}, current, update)
}
}
return result
}
module.exports = rebase
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