Function linkify

src/js/core/Util.js:477–517

(text, targets, is_touch)

/*	* Turns plain text links into real links
================================================== */
export function linkify(text, targets, is_touch) {

    var make_link = function(url, link_text, prefix) {
            if (!prefix) {
                prefix = "";
            }
            var MAX_LINK_TEXT_LENGTH = 30;
            if (link_text && link_text.length > MAX_LINK_TEXT_LENGTH) {
                link_text = link_text.substring(0, MAX_LINK_TEXT_LENGTH) + "\u2026"; // unicode ellipsis
            }
            return prefix + "<a class='tl-makelink' href='" + url + "' onclick='void(0)'>" + link_text + "</a>";
        }
        // http://, https://, ftp://
    var urlPattern = /\b(?:https?|ftp):\/\/([a-z0-9-+&@#\/%?=~_|!:,.;]*[a-z0-9-+&@#\/%=~_|])/gim;

    // www. sans http:// or https://
    var pseudoUrlPattern = /(^|[^\/>])(www\.[\S]+(\b|$))/gim;

    // Email addresses
    var emailAddressPattern = /([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+)/gim;


    return text
        .replace(urlPattern, function(match, url_sans_protocol, offset, string) {
            // Javascript doesn't support negative lookbehind assertions, so
            // we need to handle risk of matching URLs in legit hrefs
            if (offset > 0) {
                var prechar = string[offset - 1];
                if (prechar == '"' || prechar == "'" || prechar == "=") {
                    return match;
                }
            }
            return make_link(match, url_sans_protocol);
        })
        .replace(pseudoUrlPattern, function(match, beforePseudo, pseudoUrl, offset, string) {
            return make_link('http://' + pseudoUrl, pseudoUrl, beforePseudo);
        })
        .replace(emailAddressPattern, function(match, email, offset, string) {
            return make_link('mailto:' + email, email);
        });
}

/**
 * Try to make seamless the process of interpreting a URL to a web page which embeds an image for sharing purposes