typewriter-editor/dist/rendering/escape-html.js

A rich text editor using the Delta format with decorations and rendered with a tiny virtual dom

/*!
 * escape-html
 * Copyright(c) 2012-2013 TJ Holowaychuk
 * Copyright(c) 2015 Andreas Lubbe
 * Copyright(c) 2015 Tiancheng "Timothy" Gu
 * MIT Licensed
 */
const matchHtmlRegExp = /["'&<>]/;
/**
 * Escape special characters in the given string of html.
 *
 * @param  {string} string The string to escape for inserting into HTML
 * @return {string}
 * @public
 */
export function escapeHtml(string) {
    var str = '' + string;
    var match = matchHtmlRegExp.exec(str);
    if (!match) {
        return str;
    }
    var escape;
    var html = '';
    var index = 0;
    var lastIndex = 0;
    for (index = match.index; index < str.length; index++) {
        switch (str.charCodeAt(index)) {
            case 34: // "
                escape = '&quot;';
                break;
            case 38: // &
                escape = '&amp;';
                break;
            case 39: // '
                escape = '&#39;';
                break;
            case 60: // <
                escape = '&lt;';
                break;
            case 62: // >
                escape = '&gt;';
                break;
            default:
                continue;
        }
        if (lastIndex !== index) {
            html += str.substring(lastIndex, index);
        }
        lastIndex = index + 1;
        html += escape;
    }
    return lastIndex !== index ? html + str.substring(lastIndex, index) : html;
}