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authorMatt A. Tobin <email@mattatobin.com>2018-02-10 02:51:36 -0500
committerMatt A. Tobin <email@mattatobin.com>2018-02-10 02:51:36 -0500
commit37d5300335d81cecbecc99812747a657588c63eb (patch)
tree765efa3b6a56bb715d9813a8697473e120436278 /toolkit/jetpack/sdk/keyboard/utils.js
parentb2bdac20c02b12f2057b9ef70b0a946113a00e00 (diff)
parent4fb11cd5966461bccc3ed1599b808237be6b0de9 (diff)
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Merge branch 'ext-work'
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+module.metadata = {
+ "stability": "unstable"
+};
+
+const { Cc, Ci } = require("chrome");
+const runtime = require("../system/runtime");
+const { isString } = require("../lang/type");
+const array = require("../util/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://dxr.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 (code in KEYS) && KEYS[code];
+};
+exports.getCodeForKey = function getCodeForKey(key) {
+ return (key in CODES) && 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);
+};