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