forked from M3-Academy/challenge-algorithms-v2.0
49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
|
'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
|