1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/addon-sdk/source/lib/diffpatcher/rebase.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,36 @@
1.4 +"use strict";
1.5 +
1.6 +var nil = {}
1.7 +var owns = ({}).hasOwnProperty
1.8 +
1.9 +function rebase(result, parent, delta) {
1.10 + var key, current, previous, update
1.11 + for (key in parent) {
1.12 + if (owns.call(parent, key)) {
1.13 + previous = parent[key]
1.14 + update = owns.call(delta, key) ? delta[key] : nil
1.15 + if (previous === null) continue
1.16 + else if (previous === void(0)) continue
1.17 + else if (update === null) continue
1.18 + else if (update === void(0)) continue
1.19 + else result[key] = previous
1.20 + }
1.21 + }
1.22 + for (key in delta) {
1.23 + if (owns.call(delta, key)) {
1.24 + update = delta[key]
1.25 + current = owns.call(result, key) ? result[key] : nil
1.26 + if (current === update) continue
1.27 + else if (update === null) continue
1.28 + else if (update === void(0)) continue
1.29 + else if (current === nil) result[key] = update
1.30 + else if (typeof(update) !== "object") result[key] = update
1.31 + else if (typeof(current) !== "object") result[key] = update
1.32 + else result[key]= rebase({}, current, update)
1.33 + }
1.34 + }
1.35 +
1.36 + return result
1.37 +}
1.38 +
1.39 +module.exports = rebase
