| 'use strict' |
| |
| const statuses = require('../lib/statuses') |
| const supported = require('../lib/supported') |
| const browsers = require('./browsers').browsers |
| const versions = require('./browserVersions').browserVersions |
| |
| const MATH2LOG = Math.log(2) |
| |
| function unpackSupport(cipher) { |
| // bit flags |
| let stats = Object.keys(supported).reduce((list, support) => { |
| if (cipher & supported[support]) list.push(support) |
| return list |
| }, []) |
| |
| // notes |
| let notes = cipher >> 7 |
| let notesArray = [] |
| while (notes) { |
| let note = Math.floor(Math.log(notes) / MATH2LOG) + 1 |
| notesArray.unshift(`#${note}`) |
| notes -= Math.pow(2, note - 1) |
| } |
| |
| return stats.concat(notesArray).join(' ') |
| } |
| |
| function unpackFeature(packed) { |
| let unpacked = { status: statuses[packed.B], title: packed.C } |
| unpacked.stats = Object.keys(packed.A).reduce((browserStats, key) => { |
| let browser = packed.A[key] |
| browserStats[browsers[key]] = Object.keys(browser).reduce( |
| (stats, support) => { |
| let packedVersions = browser[support].split(' ') |
| let unpacked2 = unpackSupport(support) |
| packedVersions.forEach(v => (stats[versions[v]] = unpacked2)) |
| return stats |
| }, |
| {} |
| ) |
| return browserStats |
| }, {}) |
| return unpacked |
| } |
| |
| module.exports = unpackFeature |
| module.exports.default = unpackFeature |