/**
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */
'use strict';

export class Emoji {
    // reference: https://github.com/thekevinscott/emoji-tree/blob/master/lib/emojiRegex.js
    public static EmojiRegex = new RegExp('(?:[\u2700-\u27bf]|(?:\ud83c[\udde6-\uddff])' +
    '{2}|[\ud800-\udbff][\udc00-\udfff]|[\u0023-\u0039]\ufe0f?\u20e3|\u3299|' +
    '\u3297|\u303d|\u3030|\u24c2|\ud83c[\udd70-\udd71]|\ud83c[\udd7e-\udd7f]|' +
    '\ud83c\udd8e|\ud83c[\udd91-\udd9a]|\ud83c[\udde6-\uddff]|[\ud83c\ude01-\ude02]|' +
    '\ud83c\ude1a|\ud83c\ude2f|[\ud83c\ude32-\ude3a]|[\ud83c\ude50-\ude51]|\u203c|\u2049|' +
    '[\u25aa-\u25ab]|\u25b6|\u25c0|[\u25fb-\u25fe]|\u00a9|\u00ae|\u2122|\u2139|\ud83c\udc04|' +
    '[\u2600-\u26FF]|\u2b05|\u2b06|\u2b07|\u2b1b|\u2b1c|\u2b50|\u2b55|\u231a|\u231b|\u2328|\u23cf|' +
    '[\u23e9-\u23f3]|[\u23f8-\u23fa]|\ud83c\udccf|\u2934|\u2935|[\u2190-\u21ff])', 'g');

    /**
     * Calculate extra offset caused by emojis.
     *
     * @param content
     */
    public static getEmojiOffset(content: string): number {
        return content.length - content.replace(Emoji.EmojiRegex, ' ').length;
    }
}