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node_modules/autoprefixer/lib/prefixer.js

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+let Browsers = require('./browsers')
+let vendor = require('./vendor')
+let utils = require('./utils')
+
+/**
+ * Recursively clone objects
+ */
+function clone(obj, parent) {
+  let cloned = new obj.constructor()
+
+  for (let i of Object.keys(obj || {})) {
+    let value = obj[i]
+    if (i === 'parent' && typeof value === 'object') {
+      if (parent) {
+        cloned[i] = parent
+      }
+    } else if (i === 'source' || i === null) {
+      cloned[i] = value
+    } else if (Array.isArray(value)) {
+      cloned[i] = value.map(x => clone(x, cloned))
+    } else if (
+      i !== '_autoprefixerPrefix' &&
+      i !== '_autoprefixerValues' &&
+      i !== 'proxyCache'
+    ) {
+      if (typeof value === 'object' && value !== null) {
+        value = clone(value, cloned)
+      }
+      cloned[i] = value
+    }
+  }
+
+  return cloned
+}
+
+class Prefixer {
+  /**
+   * Add hack to selected names
+   */
+  static hack(klass) {
+    if (!this.hacks) {
+      this.hacks = {}
+    }
+    return klass.names.map(name => {
+      this.hacks[name] = klass
+      return this.hacks[name]
+    })
+  }
+
+  /**
+   * Load hacks for some names
+   */
+  static load(name, prefixes, all) {
+    let Klass = this.hacks && this.hacks[name]
+    if (Klass) {
+      return new Klass(name, prefixes, all)
+    } else {
+      return new this(name, prefixes, all)
+    }
+  }
+
+  /**
+   * Clone node and clean autprefixer custom caches
+   */
+  static clone(node, overrides) {
+    let cloned = clone(node)
+    for (let name in overrides) {
+      cloned[name] = overrides[name]
+    }
+    return cloned
+  }
+
+  constructor(name, prefixes, all) {
+    this.prefixes = prefixes
+    this.name = name
+    this.all = all
+  }
+
+  /**
+   * Find prefix in node parents
+   */
+  parentPrefix(node) {
+    let prefix
+
+    if (typeof node._autoprefixerPrefix !== 'undefined') {
+      prefix = node._autoprefixerPrefix
+    } else if (node.type === 'decl' && node.prop[0] === '-') {
+      prefix = vendor.prefix(node.prop)
+    } else if (node.type === 'root') {
+      prefix = false
+    } else if (
+      node.type === 'rule' &&
+      node.selector.includes(':-') &&
+      /:(-\w+-)/.test(node.selector)
+    ) {
+      prefix = node.selector.match(/:(-\w+-)/)[1]
+    } else if (node.type === 'atrule' && node.name[0] === '-') {
+      prefix = vendor.prefix(node.name)
+    } else {
+      prefix = this.parentPrefix(node.parent)
+    }
+
+    if (!Browsers.prefixes().includes(prefix)) {
+      prefix = false
+    }
+
+    node._autoprefixerPrefix = prefix
+
+    return node._autoprefixerPrefix
+  }
+
+  /**
+   * Clone node with prefixes
+   */
+  process(node, result) {
+    if (!this.check(node)) {
+      return undefined
+    }
+
+    let parent = this.parentPrefix(node)
+
+    let prefixes = this.prefixes.filter(
+      prefix => !parent || parent === utils.removeNote(prefix)
+    )
+
+    let added = []
+    for (let prefix of prefixes) {
+      if (this.add(node, prefix, added.concat([prefix]), result)) {
+        added.push(prefix)
+      }
+    }
+
+    return added
+  }
+
+  /**
+   * Shortcut for Prefixer.clone
+   */
+  clone(node, overrides) {
+    return Prefixer.clone(node, overrides)
+  }
+}
+
+module.exports = Prefixer