react app

react-app/node_modules/react/lib/getEventKey.js

@@ -0,0 +1,103 @@
+/**
+ * Copyright 2013-2015, 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.
+ *
+ * @providesModule getEventKey
+ * @typechecks static-only
+ */
+
+'use strict';
+
+var getEventCharCode = require("./getEventCharCode");
+
+/**
+ * Normalization of deprecated HTML5 `key` values
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent#Key_names
+ */
+var normalizeKey = {
+  'Esc': 'Escape',
+  'Spacebar': ' ',
+  'Left': 'ArrowLeft',
+  'Up': 'ArrowUp',
+  'Right': 'ArrowRight',
+  'Down': 'ArrowDown',
+  'Del': 'Delete',
+  'Win': 'OS',
+  'Menu': 'ContextMenu',
+  'Apps': 'ContextMenu',
+  'Scroll': 'ScrollLock',
+  'MozPrintableKey': 'Unidentified'
+};
+
+/**
+ * Translation from legacy `keyCode` to HTML5 `key`
+ * Only special keys supported, all others depend on keyboard layout or browser
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent#Key_names
+ */
+var translateToKey = {
+  8: 'Backspace',
+  9: 'Tab',
+  12: 'Clear',
+  13: 'Enter',
+  16: 'Shift',
+  17: 'Control',
+  18: 'Alt',
+  19: 'Pause',
+  20: 'CapsLock',
+  27: 'Escape',
+  32: ' ',
+  33: 'PageUp',
+  34: 'PageDown',
+  35: 'End',
+  36: 'Home',
+  37: 'ArrowLeft',
+  38: 'ArrowUp',
+  39: 'ArrowRight',
+  40: 'ArrowDown',
+  45: 'Insert',
+  46: 'Delete',
+  112: 'F1', 113: 'F2', 114: 'F3', 115: 'F4', 116: 'F5', 117: 'F6',
+  118: 'F7', 119: 'F8', 120: 'F9', 121: 'F10', 122: 'F11', 123: 'F12',
+  144: 'NumLock',
+  145: 'ScrollLock',
+  224: 'Meta'
+};
+
+/**
+ * @param {object} nativeEvent Native browser event.
+ * @return {string} Normalized `key` property.
+ */
+function getEventKey(nativeEvent) {
+  if (nativeEvent.key) {
+    // Normalize inconsistent values reported by browsers due to
+    // implementations of a working draft specification.
+
+    // FireFox implements `key` but returns `MozPrintableKey` for all
+    // printable characters (normalized to `Unidentified`), ignore it.
+    var key = normalizeKey[nativeEvent.key] || nativeEvent.key;
+    if (key !== 'Unidentified') {
+      return key;
+    }
+  }
+
+  // Browser does not implement `key`, polyfill as much of it as we can.
+  if (nativeEvent.type === 'keypress') {
+    var charCode = getEventCharCode(nativeEvent);
+
+    // The enter-key is technically both printable and non-printable and can
+    // thus be captured by `keypress`, no other non-printable key should.
+    return charCode === 13 ? 'Enter' : String.fromCharCode(charCode);
+  }
+  if (nativeEvent.type === 'keydown' || nativeEvent.type === 'keyup') {
+    // While user keyboard layout determines the actual meaning of each
+    // `keyCode` value, almost all function keys have a universal value.
+    return translateToKey[nativeEvent.keyCode] || 'Unidentified';
+  }
+  return '';
+}
+
+module.exports = getEventKey;