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83 lines
2.9 KiB
JavaScript
83 lines
2.9 KiB
JavaScript
/*
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* The code in this file is by StackOverflow user Juan Mendes.
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* License: Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0).
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* Source: https://stackoverflow.com/a/14966749
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*/
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/**
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* Creates a map out of an array be choosing what property to key by
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* @param {object[]} array Array that will be converted into a map
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* @param {string} prop Name of property to key by
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* @return {object} The mapped array. Example:
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* mapFromArray([{a:1,b:2}, {a:3,b:4}], 'a')
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* returns {1: {a:1,b:2}, 3: {a:3,b:4}}
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*/
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function mapFromArray(array, prop) {
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var map = {};
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for (var i = 0; i < array.length; i++) {
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map[ array[i][prop] ] = array[i];
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}
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return map;
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}
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/**
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* @param {object[]} o old array of notes (local copy)
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* @param {object[]} n new array of notes (remote copy)
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* @param {object} An object with changes
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*/
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function getDelta(o, n) {
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var delta = {
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addedRemote: [],
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addedLocal: [],
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deletedRemote: [],
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deletedLocal: [],
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changedRemote: [],
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changedLocal: [],
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noChange: []
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};
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oSane = [];
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for (var i = 0; i < o.length; i++) {
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if (o[i].noteid == null) { // Note has no real `noteid`
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delta.addedLocal.push(o[i]);
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} else {
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oSane.push(o[i]);
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}
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}
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var local = mapFromArray(oSane, 'noteid');
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var remote = mapFromArray(n, 'noteid');
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for (var id in local) {
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if (!remote.hasOwnProperty(id)) { // Notes that are only present locally
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delta.addedLocal.push(local[id]);
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// TODO: Figure out which notes were actually added locally and which were deleted on the server
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/*if (local[id].norealid) { // Note hasn't been synced to the remote yet
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delta.addedLocal.push(local[id]);
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} else { // Note has been synced to remote but isn't there anymore
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delta.deletedRemote.push(local[id]);
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}*/
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} else { // Notes that are present on both
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if (local[id].modified > remote[id].modified) { // Local copy is newer
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delta.changedLocal.push(local[id]);
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} else if (local[id].modified < remote[id].modified) { // Remote copy is newer
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delta.changedRemote.push(remote[id]);
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} else { // Modified date is same, let's check content
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if (local[id].content == remote[id].content) {
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delta.noChange.push(local[id]);
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} else if (local[id].content.length > remote[id].content.length) {
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delta.changedLocal.push(local[id]);
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} else {
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delta.changedRemote.push(remote[id]);
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}
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}
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}
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}
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// Add notes that are only on the remote
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for (var id in remote) {
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if (!local.hasOwnProperty(id)) {
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delta.addedRemote.push(remote[id]);
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}
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}
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return delta;
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} |