Initial commit

2026-07-31 10:08:13 +02:00
parent 652943fb7e
commit a69f31649c
7192 changed files with 924319 additions and 0 deletions
@@ -0,0 +1,81 @@
+'use strict'
+
+const statuses = require('../lib/statuses')
+const supported = require('../lib/supported')
+const browsers = require('./browsers').browsers
+const versions = require('./browserVersions').browserVersions
+const versionGroups = require('./versionGroups.js').versionGroups
+
+const MATH2LOG = Math.log(2)
+
+const groupCache = {}
+
+function expandKey(key) {
+  let cached = groupCache[key]
+  if (cached === undefined) {
+    cached = groupCache[key] = expandGroups(versionGroups[key], [])
+  }
+  return cached
+}
+
+function expandGroups(value, out) {
+  let start = 0
+  for (let i = 0, len = value.length; i <= len; i++) {
+    if (i === len || value.charCodeAt(i) === 32) {
+      if (i > start) {
+        if (value.charCodeAt(start) === 95) {
+          let group = expandKey(value.slice(start + 1, i))
+          for (let j = 0; j < group.length; j++) out.push(group[j])
+        } else {
+          out.push(value.slice(start, i))
+        }
+      }
+      start = i + 1
+    }
+  }
+  return out
+}
+
+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 = expandGroups(browser[support], [])
+        let unpacked2 = unpackSupport(support)
+        packedVersions.forEach(v => (stats[versions[v]] = unpacked2))
+        return stats
+      },
+      {}
+    )
+    return browserStats
+  }, {})
+  return unpacked
+}
+
+module.exports = unpackFeature
+module.exports.default = unpackFeature