From de98e0b232509d5f40c135d540a70e415272ff85 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Wed, 3 May 2017 15:35:00 +0200
Subject: node_modules

---
 node_modules/fbjs/lib/CSSCore.js | 121 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 node_modules/fbjs/lib/CSSCore.js

(limited to 'node_modules/fbjs/lib/CSSCore.js')

diff --git a/node_modules/fbjs/lib/CSSCore.js b/node_modules/fbjs/lib/CSSCore.js
new file mode 100644
index 000000000..c8efce7dd
--- /dev/null
+++ b/node_modules/fbjs/lib/CSSCore.js
@@ -0,0 +1,121 @@
+'use strict';
+
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @typechecks
+ */
+
+var invariant = require('./invariant');
+
+/**
+ * The CSSCore module specifies the API (and implements most of the methods)
+ * that should be used when dealing with the display of elements (via their
+ * CSS classes and visibility on screen. It is an API focused on mutating the
+ * display and not reading it as no logical state should be encoded in the
+ * display of elements.
+ */
+
+/* Slow implementation for browsers that don't natively support .matches() */
+function matchesSelector_SLOW(element, selector) {
+  var root = element;
+  while (root.parentNode) {
+    root = root.parentNode;
+  }
+
+  var all = root.querySelectorAll(selector);
+  return Array.prototype.indexOf.call(all, element) !== -1;
+}
+
+var CSSCore = {
+
+  /**
+   * Adds the class passed in to the element if it doesn't already have it.
+   *
+   * @param {DOMElement} element the element to set the class on
+   * @param {string} className the CSS className
+   * @return {DOMElement} the element passed in
+   */
+  addClass: function addClass(element, className) {
+    !!/\s/.test(className) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'CSSCore.addClass takes only a single class name. "%s" contains ' + 'multiple classes.', className) : invariant(false) : void 0;
+
+    if (className) {
+      if (element.classList) {
+        element.classList.add(className);
+      } else if (!CSSCore.hasClass(element, className)) {
+        element.className = element.className + ' ' + className;
+      }
+    }
+    return element;
+  },
+
+  /**
+   * Removes the class passed in from the element
+   *
+   * @param {DOMElement} element the element to set the class on
+   * @param {string} className the CSS className
+   * @return {DOMElement} the element passed in
+   */
+  removeClass: function removeClass(element, className) {
+    !!/\s/.test(className) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'CSSCore.removeClass takes only a single class name. "%s" contains ' + 'multiple classes.', className) : invariant(false) : void 0;
+
+    if (className) {
+      if (element.classList) {
+        element.classList.remove(className);
+      } else if (CSSCore.hasClass(element, className)) {
+        element.className = element.className.replace(new RegExp('(^|\\s)' + className + '(?:\\s|$)', 'g'), '$1').replace(/\s+/g, ' ') // multiple spaces to one
+        .replace(/^\s*|\s*$/g, ''); // trim the ends
+      }
+    }
+    return element;
+  },
+
+  /**
+   * Helper to add or remove a class from an element based on a condition.
+   *
+   * @param {DOMElement} element the element to set the class on
+   * @param {string} className the CSS className
+   * @param {*} bool condition to whether to add or remove the class
+   * @return {DOMElement} the element passed in
+   */
+  conditionClass: function conditionClass(element, className, bool) {
+    return (bool ? CSSCore.addClass : CSSCore.removeClass)(element, className);
+  },
+
+  /**
+   * Tests whether the element has the class specified.
+   *
+   * @param {DOMNode|DOMWindow} element the element to check the class on
+   * @param {string} className the CSS className
+   * @return {boolean} true if the element has the class, false if not
+   */
+  hasClass: function hasClass(element, className) {
+    !!/\s/.test(className) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'CSS.hasClass takes only a single class name.') : invariant(false) : void 0;
+    if (element.classList) {
+      return !!className && element.classList.contains(className);
+    }
+    return (' ' + element.className + ' ').indexOf(' ' + className + ' ') > -1;
+  },
+
+  /**
+   * Tests whether the element matches the selector specified
+   *
+   * @param {DOMNode|DOMWindow} element the element that we are querying
+   * @param {string} selector the CSS selector
+   * @return {boolean} true if the element matches the selector, false if not
+   */
+  matchesSelector: function matchesSelector(element, selector) {
+    var matchesImpl = element.matches || element.webkitMatchesSelector || element.mozMatchesSelector || element.msMatchesSelector || function (s) {
+      return matchesSelector_SLOW(element, s);
+    };
+    return matchesImpl.call(element, selector);
+  }
+
+};
+
+module.exports = CSSCore;
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