.

qwen/nodejs/node_modules/caniuse-lite/dist/unpacker/feature.js

@@ -0,0 +1,52 @@
+'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