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// Replace link-like texts with link nodes.
//
// Currently restricted by `inline.validateLink()` to http/https/ftp
//
'use strict';
var Autolinker = require('autolinker');
var arrayReplaceAt = require('../common/utils').arrayReplaceAt;
var LINK_SCAN_RE = /www|@|\:\/\//;
function isLinkOpen(str) {
return /^<a[>\s]/i.test(str);
}
function isLinkClose(str) {
return /^<\/a\s*>/i.test(str);
}
// Stupid fabric to avoid singletons, for thread safety.
// Required for engines like Nashorn.
//
function createLinkifier() {
var links = [];
var autolinker = new Autolinker({
stripPrefix: false,
url: true,
email: true,
twitter: false,
replaceFn: function (autolinker, match) {
// Only collect matched strings but don't change anything.
switch (match.getType()) {
/*eslint default-case:0*/
case 'url':
links.push({
text: match.matchedText,
url: match.getUrl()
});
break;
case 'email':
links.push({
text: match.matchedText,
// normalize email protocol
url: 'mailto:' + match.getEmail().replace(/^mailto:/i, '')
});
break;
}
return false;
}
});
return {
links: links,
autolinker: autolinker
};
}
module.exports = function linkify(state) {
var i, j, l, tokens, token, text, nodes, ln, pos, level, htmlLinkLevel,
blockTokens = state.tokens,
linkifier = null, links, autolinker;
if (!state.options.linkify) { return; }
for (j = 0, l = blockTokens.length; j < l; j++) {
if (blockTokens[j].type !== 'inline') { continue; }
tokens = blockTokens[j].children;
htmlLinkLevel = 0;
// We scan from the end, to keep position when new tags added.
// Use reversed logic in links start/end match
for (i = tokens.length - 1; i >= 0; i--) {
token = tokens[i];
// Skip content of markdown links
if (token.type === 'link_close') {
i--;
while (tokens[i].level !== token.level && tokens[i].type !== 'link_open') {
i--;
}
continue;
}
// Skip content of html tag links
if (token.type === 'htmltag') {
if (isLinkOpen(token.content) && htmlLinkLevel > 0) {
htmlLinkLevel--;
}
if (isLinkClose(token.content)) {
htmlLinkLevel++;
}
}
if (htmlLinkLevel > 0) { continue; }
if (token.type === 'text' && LINK_SCAN_RE.test(token.content)) {
// Init linkifier in lazy manner, only if required.
if (!linkifier) {
linkifier = createLinkifier();
links = linkifier.links;
autolinker = linkifier.autolinker;
}
text = token.content;
links.length = 0;
autolinker.link(text);
if (!links.length) { continue; }
// Now split string to nodes
nodes = [];
level = token.level;
for (ln = 0; ln < links.length; ln++) {
if (!state.inline.validateLink(links[ln].url)) { continue; }
pos = text.indexOf(links[ln].text);
if (pos) {
level = level;
nodes.push({
type: 'text',
content: text.slice(0, pos),
level: level
});
}
nodes.push({
type: 'link_open',
href: links[ln].url,
title: '',
level: level++
});
nodes.push({
type: 'text',
content: links[ln].text,
level: level
});
nodes.push({
type: 'link_close',
level: --level
});
text = text.slice(pos + links[ln].text.length);
}
if (text.length) {
nodes.push({
type: 'text',
content: text,
level: level
});
}
// replace current node
blockTokens[j].children = tokens = arrayReplaceAt(tokens, i, nodes);
}
}
}
};