Current Dev State

static/js/ketcher2/script/ui/keynorm.js

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+/****************************************************************************
+ * Copyright 2017 EPAM Systems
+ *
+ * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ***************************************************************************/
+
+import keyName from "w3c-keyname";
+
+const mac = typeof navigator !== "undefined" ? /Mac/.test(navigator.platform) : false;
+
+function normalizeKeyName(name) {
+	let parts = name.split(/\+(?!$)/), result = parts[parts.length - 1];
+	if (result === "Space") result = " ";
+	let alt, ctrl, shift, meta;
+
+	for (let i = 0; i < parts.length - 1; i++) {
+		let mod = parts[i];
+		if (/^(cmd|meta|m)$/i.test(mod)) meta = true;
+		else if (/^a(lt)?$/i.test(mod)) alt = true;
+		else if (/^(c|ctrl|control)$/i.test(mod)) ctrl = true;
+		else if (/^s(hift)?$/i.test(mod)) shift = true;
+		else if (/^mod$/i.test(mod)) { if (mac) meta = true; else ctrl = true; }
+		else throw new Error("Unrecognized modifier name: " + mod);
+	}
+
+	if (alt) result = "Alt+" + result;
+	if (ctrl) result = "Ctrl+" + result;
+	if (meta) result = "Meta+" + result;
+	if (shift) result = "Shift+" + result;
+
+	return result;
+}
+
+function normalizeKeyMap(map) {
+	const copy = Object.create(null);
+
+	for (let prop in map) {
+		if (map.hasOwnProperty(prop))
+			copy[normalizeKeyName(prop)] = map[prop];
+	}
+
+	return copy;
+}
+
+function modifiers(name, event, shift) {
+	if (event.altKey) name = "Alt+" + name;
+	if (event.ctrlKey) name = "Ctrl+" + name;
+	if (event.metaKey) name = "Meta+" + name;
+	if (shift !== false && event.shiftKey) name = "Shift+" + name;
+
+	return name;
+}
+
+function normalizeKeyEvent(event, base=false) {
+	const name = keyName(event);
+	const isChar = name.length === 1 && name !== " ";
+
+	return isChar && !base ? modifiers(name, event, !isChar) :
+	    modifiers(keyName.base[event.keyCode], event, true);
+}
+
+function keyNorm(obj) {
+	if (obj instanceof KeyboardEvent)
+		return normalizeKeyEvent(...arguments);
+
+	return typeof obj === 'object' ? normalizeKeyMap(obj) :
+		normalizeKeyName(obj);
+}
+
+function lookup(map, event) {
+	const name = keyName(event);
+	const isChar = name.length === 1 && name !== " ";
+	let res = map[modifiers(name, event, !isChar)];
+	let baseName;
+
+	if (event.shiftKey && isChar && (baseName = keyName.base[event.keyCode])) {
+		res = map[modifiers(baseName, event, true)] || res;
+	}
+
+	return res;
+}
+
+keyNorm.lookup = lookup;
+
+export default keyNorm;