Richard
82 lines
2.1 KiB
JavaScript
82 lines
2.1 KiB
JavaScript
'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 versionGroups = require('./versionGroups.js').versionGroups
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const MATH2LOG = Math.log(2)
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const groupCache = {}
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function expandKey(key) {
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let cached = groupCache[key]
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if (cached === undefined) {
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cached = groupCache[key] = expandGroups(versionGroups[key], [])
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}
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return cached
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}
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function expandGroups(value, out) {
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let start = 0
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for (let i = 0, len = value.length; i <= len; i++) {
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if (i === len || value.charCodeAt(i) === 32) {
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if (i > start) {
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if (value.charCodeAt(start) === 95) {
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let group = expandKey(value.slice(start + 1, i))
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for (let j = 0; j < group.length; j++) out.push(group[j])
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} else {
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out.push(value.slice(start, i))
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}
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}
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start = i + 1
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}
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}
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return out
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}
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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 = expandGroups(browser[support], [])
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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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