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node_modules/autoprefixer/lib/utils.js

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+let { list } = require('postcss')
+
+/**
+ * Throw special error, to tell beniary,
+ * that this error is from Autoprefixer.
+ */
+module.exports.error = function (text) {
+  let err = new Error(text)
+  err.autoprefixer = true
+  throw err
+}
+
+/**
+ * Return array, that doesn’t contain duplicates.
+ */
+module.exports.uniq = function (array) {
+  return [...new Set(array)]
+}
+
+/**
+ * Return "-webkit-" on "-webkit- old"
+ */
+module.exports.removeNote = function (string) {
+  if (!string.includes(' ')) {
+    return string
+  }
+
+  return string.split(' ')[0]
+}
+
+/**
+ * Escape RegExp symbols
+ */
+module.exports.escapeRegexp = function (string) {
+  return string.replace(/[$()*+-.?[\\\]^{|}]/g, '\\$&')
+}
+
+/**
+ * Return regexp to check, that CSS string contain word
+ */
+module.exports.regexp = function (word, escape = true) {
+  if (escape) {
+    word = this.escapeRegexp(word)
+  }
+  return new RegExp(`(^|[\\s,(])(${word}($|[\\s(,]))`, 'gi')
+}
+
+/**
+ * Change comma list
+ */
+module.exports.editList = function (value, callback) {
+  let origin = list.comma(value)
+  let changed = callback(origin, [])
+
+  if (origin === changed) {
+    return value
+  }
+
+  let join = value.match(/,\s*/)
+  join = join ? join[0] : ', '
+  return changed.join(join)
+}
+
+/**
+ * Split the selector into parts.
+ * It returns 3 level deep array because selectors can be comma
+ * separated (1), space separated (2), and combined (3)
+ * @param {String} selector selector string
+ * @return {Array<Array<Array>>} 3 level deep array of split selector
+ * @see utils.test.js for examples
+ */
+module.exports.splitSelector = function (selector) {
+  return list.comma(selector).map(i => {
+    return list.space(i).map(k => {
+      return k.split(/(?=\.|#)/g)
+    })
+  })
+}