addon-sdk/source/lib/diffpatcher/diff.js@129ffea94266 (annotated)
addon-sdk/source/lib/diffpatcher/diff.js
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
| michael@0 | 1 | "use strict"; |
| michael@0 | 2 | |
| michael@0 | 3 | var method = require("../method/core") |
| michael@0 | 4 | |
| michael@0 | 5 | // Method is designed to work with data structures representing application |
| michael@0 | 6 | // state. Calling it with a state should return object representing `delta` |
| michael@0 | 7 | // that has being applied to a previous state to get to a current state. |
| michael@0 | 8 | // |
| michael@0 | 9 | // Example |
| michael@0 | 10 | // |
| michael@0 | 11 | // diff(state) // => { "item-id-1": { title: "some title" } "item-id-2": null } |
| michael@0 | 12 | var diff = method("diff@diffpatcher") |
| michael@0 | 13 | |
| michael@0 | 14 | // diff between `null` / `undefined` to any hash is a hash itself. |
| michael@0 | 15 | diff.define(null, function(from, to) { return to }) |
| michael@0 | 16 | diff.define(undefined, function(from, to) { return to }) |
| michael@0 | 17 | diff.define(Object, function(from, to) { |
| michael@0 | 18 | return calculate(from, to || {}) || {} |
| michael@0 | 19 | }) |
| michael@0 | 20 | |
| michael@0 | 21 | function calculate(from, to) { |
| michael@0 | 22 | var diff = {} |
| michael@0 | 23 | var changes = 0 |
| michael@0 | 24 | Object.keys(from).forEach(function(key) { |
| michael@0 | 25 | changes = changes + 1 |
| michael@0 | 26 | if (!(key in to) && from[key] != null) diff[key] = null |
| michael@0 | 27 | else changes = changes - 1 |
| michael@0 | 28 | }) |
| michael@0 | 29 | Object.keys(to).forEach(function(key) { |
| michael@0 | 30 | changes = changes + 1 |
| michael@0 | 31 | var previous = from[key] |
| michael@0 | 32 | var current = to[key] |
| michael@0 | 33 | if (previous === current) return (changes = changes - 1) |
| michael@0 | 34 | if (typeof(current) !== "object") return diff[key] = current |
| michael@0 | 35 | if (typeof(previous) !== "object") return diff[key] = current |
| michael@0 | 36 | var delta = calculate(previous, current) |
| michael@0 | 37 | if (delta) diff[key] = delta |
| michael@0 | 38 | else changes = changes - 1 |
| michael@0 | 39 | }) |
| michael@0 | 40 | return changes ? diff : null |
| michael@0 | 41 | } |
| michael@0 | 42 | |
| michael@0 | 43 | diff.calculate = calculate |
| michael@0 | 44 | |
| michael@0 | 45 | module.exports = diff |
