feature.js•1.36 kB
'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,
shown: packed.D
}
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