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+/* vim:set ts=2 sw=2 sts=2 et: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Jetpack.
+ *
+ * The Initial Developer of the Original Code is
+ * the Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2011
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Irakli Gozalishvili <gozala@mozilla.com> (Original Author)
+ *   Henri Wiechers <hwiechers@gmail.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+"use strict";
+
+const { Cc, Ci } = require("chrome");
+const runtime = require("../runtime");
+const { isString } = require("../type");
+const array = require("../array");
+
+
+const SWP = "{{SEPARATOR}}";
+const SEPARATOR = "-"
+const INVALID_COMBINATION = "Hotkey key combination must contain one or more " +
+                            "modifiers and only one key";
+
+// Map of modifier key mappings.
+const MODIFIERS = exports.MODIFIERS = {
+  'accel': runtime.OS === "Darwin" ? 'meta' : 'control',
+  'meta': 'meta',
+  'control': 'control',
+  'ctrl': 'control',
+  'option': 'alt',
+  'command': 'meta',
+  'alt': 'alt',
+  'shift': 'shift'
+};
+
+// Hash of key:code pairs for all the chars supported by `nsIDOMKeyEvent`.
+// This is just a copy of the `nsIDOMKeyEvent` hash with normalized names.
+// @See: http://mxr.mozilla.org/mozilla-central/source/dom/interfaces/events/nsIDOMKeyEvent.idl
+const CODES = exports.CODES = new function Codes() {
+  let nsIDOMKeyEvent = Ci.nsIDOMKeyEvent;
+  // Names that will be substituted with a shorter analogs.
+  let aliases = {
+    'subtract':     '-',
+    'add':          '+',
+    'equals':       '=',
+    'slash':        '/',
+    'backslash':    '\\',
+    'openbracket':  '[',
+    'closebracket': ']',
+    'quote':        '\'',
+    'backquote':    '`',
+    'period':       '.',
+    'semicolon':    ';',
+    'comma':        ','
+  };
+
+  // Normalizing keys and copying values to `this` object.
+  Object.keys(nsIDOMKeyEvent).filter(function(key) {
+    // Filter out only key codes.
+    return key.indexOf('DOM_VK') === 0;
+  }).map(function(key) {
+    // Map to key:values
+    return [ key, nsIDOMKeyEvent[key] ];
+  }).map(function([key, value]) {
+    return [ key.replace('DOM_VK_', '').replace('_', '').toLowerCase(), value ];
+  }).forEach(function ([ key, value ]) {
+    this[aliases[key] || key] = value;
+  }, this);
+};
+
+// Inverted `CODES` hash of `code:key`.
+const KEYS = exports.KEYS = new function Keys() {
+  Object.keys(CODES).forEach(function(key) {
+    this[CODES[key]] = key;
+  }, this)
+}
+
+exports.getKeyForCode = function getKeyForCode(code) { return KEYS[code]; };
+exports.getCodeForKey = function getCodeForKey(key) { return CODES[key]; };
+
+/**
+ * Utility function that takes string or JSON that defines a `hotkey` and
+ * returns normalized string version of it.
+ * @param {JSON|String} hotkey
+ * @param {String} [separator=" "]
+ *    Optional string that represents separator used to concatenate keys in the
+ *    given `hotkey`.
+ * @returns {String}
+ * @examples
+ *
+ *    require("keyboard/hotkeys").normalize("b Shift accel");
+ *    // 'control shift b' -> on windows & linux
+ *    // 'meta shift b'    -> on mac
+ *    require("keyboard/hotkeys").normalize("alt-d-shift", "-");
+ *    // 'alt shift d'
+ */
+var normalize = exports.normalize = function normalize(hotkey, separator) {
+  if (!isString(hotkey))
+    hotkey = toString(hotkey, separator);
+  return toString(toJSON(hotkey, separator), separator);
+};
+
+/*
+ * Utility function that splits a string of characters that defines a `hotkey`
+ * into modifier keys and the defining key.
+ * @param {String} hotkey
+ * @param {String} [separator=" "]
+ *    Optional string that represents separator used to concatenate keys in the
+ *    given `hotkey`.
+ * @returns {JSON}
+ * @examples
+ *
+ *    require("keyboard/hotkeys").toJSON("accel shift b");
+ *    // { key: 'b', modifiers: [ 'control', 'shift' ] } -> on windows & linux
+ *    // { key: 'b', modifiers: [ 'meta', 'shift' ] }    -> on mac
+ *
+ *    require("keyboard/hotkeys").normalize("alt-d-shift", "-");
+ *    // { key: 'd', modifiers: [ 'alt', 'shift' ] }
+ */
+var toJSON = exports.toJSON = function toJSON(hotkey, separator) {
+  separator = separator || SEPARATOR;
+  // Since default separator is `-`, combination may take form of `alt--`. To
+  // avoid misbehavior we replace `--` with `-{{SEPARATOR}}` where
+  // `{{SEPARATOR}}` can be swapped later.
+  hotkey = hotkey.toLowerCase().replace(separator + separator, separator + SWP);
+
+  let value = {};
+  let modifiers = [];
+  let keys = hotkey.split(separator);
+  keys.forEach(function(name) {
+    // If name is `SEPARATOR` than we swap it back.
+    if (name === SWP)
+      name = separator;
+    if (name in MODIFIERS) {
+      array.add(modifiers, MODIFIERS[name]);
+    } else {
+      if (!value.key)
+        value.key = name;
+      else
+        throw new TypeError(INVALID_COMBINATION);
+    }
+  });
+
+  if (!value.key)
+      throw new TypeError(INVALID_COMBINATION);
+
+  value.modifiers = modifiers.sort();
+  return value;
+};
+
+/**
+ * Utility function that takes object that defines a `hotkey` and returns
+ * string representation of it.
+ *
+ * _Please note that this function does not validates data neither it normalizes
+ * it, if you are unsure that data is well formed use `normalize` function
+ * instead.
+ *
+ * @param {JSON} hotkey
+ * @param {String} [separator=" "]
+ *    Optional string that represents separator used to concatenate keys in the
+ *    given `hotkey`.
+ * @returns {String}
+ * @examples
+ *
+ *    require("keyboard/hotkeys").toString({
+ *      key: 'b',
+ *      modifiers: [ 'control', 'shift' ]
+ *    }, '+');
+ *    // 'control+shift+b
+ *
+ */
+var toString = exports.toString = function toString(hotkey, separator) {
+  let keys = hotkey.modifiers.slice();
+  keys.push(hotkey.key);
+  return keys.join(separator || SEPARATOR);
+};
+
+/**
+ * Utility function takes `key` name and returns `true` if it's function key
+ * (F1, ..., F24) and `false` if it's not.
+ */
+var isFunctionKey = exports.isFunctionKey = function isFunctionKey(key) {
+  var $
+  return key[0].toLowerCase() === 'f' &&
+         ($ = parseInt(key.substr(1)), 0 < $ && $ < 25);
+};