mirror of https://github.com/zulip/zulip.git
449 lines
15 KiB
JavaScript
449 lines
15 KiB
JavaScript
// This contains zulip's frontend markdown implementation; see
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// docs/subsystems/markdown.md for docs on our Markdown syntax. The other
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// main piece in rendering markdown client-side is
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// static/third/marked/lib/marked.js, which we have significantly
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// modified from the original implementation.
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var markdown = (function () {
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// Docs: https://zulip.readthedocs.io/en/latest/subsystems/markdown.html
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var exports = {};
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var realm_filter_map = {};
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var realm_filter_list = [];
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// Helper function
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function escape(html, encode) {
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return html
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.replace(!encode ? /&(?!#?\w+;)/g : /&/g, '&')
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/"/g, '"')
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.replace(/'/g, ''');
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}
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// Regexes that match some of our common bugdown markup
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var backend_only_markdown_re = [
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// Inline image previews, check for contiguous chars ending in image suffix
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// To keep the below regexes simple, split them out for the end-of-message case
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/[^\s]*(?:(?:\.bmp|\.gif|\.jpg|\.jpeg|\.png|\.webp)\)?)\s+/m,
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/[^\s]*(?:(?:\.bmp|\.gif|\.jpg|\.jpeg|\.png|\.webp)\)?)$/m,
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// Twitter and youtube links are given previews
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/[^\s]*(?:twitter|youtube).com\/[^\s]*/,
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];
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exports.contains_backend_only_syntax = function (content) {
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// Try to guess whether or not a message has bugdown in it
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// If it doesn't, we can immediately render it client-side
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var markedup = _.find(backend_only_markdown_re, function (re) {
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return re.test(content);
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});
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// If a realm filter doesn't start with some specified characters
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// then don't render it locally. It is workaround for the fact that
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// javascript regex doesn't support lookbehind.
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var false_filter_match = _.find(realm_filter_list, function (re) {
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var pattern = /(?:[^\s'"\(,:<])/.source + re[0].source + /(?![\w])/.source;
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var regex = new RegExp(pattern);
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return regex.test(content);
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});
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return markedup !== undefined || false_filter_match !== undefined;
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};
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exports.apply_markdown = function (message) {
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message_store.init_booleans(message);
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// Our python-markdown processor appends two \n\n to input
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var options = {
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userMentionHandler: function (name) {
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var person = people.get_by_name(name);
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var id_regex = /(.+)\|(\d+)$/g; // For @**user|id** syntax
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var match = id_regex.exec(name);
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if (match) {
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if (people.is_known_user_id(match[2])) {
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person = people.get_person_from_user_id(match[2]);
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if (person.full_name !== match[1]) { // Invalid Syntax
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return;
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}
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}
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}
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if (person !== undefined) {
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if (people.is_my_user_id(person.user_id)) {
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message.mentioned = true;
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message.mentioned_me_directly = true;
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}
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return '<span class="user-mention" data-user-id="' + person.user_id + '">' +
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'@' + escape(person.full_name, true) +
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'</span>';
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} else if (name === 'all' || name === 'everyone' || name === 'stream') {
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message.mentioned = true;
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return '<span class="user-mention" data-user-id="*">' +
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'@' + name +
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'</span>';
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}
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return;
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},
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groupMentionHandler: function (name) {
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var group = user_groups.get_user_group_from_name(name);
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if (group !== undefined) {
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if (user_groups.is_member_of(group.id, people.my_current_user_id())) {
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message.mentioned = true;
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}
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return '<span class="user-group-mention" data-user-group-id="' + group.id + '">' +
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'@' + escape(group.name, true) +
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'</span>';
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}
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return;
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},
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};
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message.content = marked(message.raw_content + '\n\n', options).trim();
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message.is_me_message = exports.is_status_message(message.raw_content, message.content);
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};
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exports.add_topic_links = function (message) {
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if (message.type !== 'stream') {
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util.set_topic_links(message, []);
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return;
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}
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var topic = message.subject;
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var links = [];
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_.each(realm_filter_list, function (realm_filter) {
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var pattern = realm_filter[0];
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var url = realm_filter[1];
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var match;
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while ((match = pattern.exec(topic)) !== null) {
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var link_url = url;
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var matched_groups = match.slice(1);
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var i = 0;
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while (i < matched_groups.length) {
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var matched_group = matched_groups[i];
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var current_group = i + 1;
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var back_ref = "\\" + current_group;
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link_url = link_url.replace(back_ref, matched_group);
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i += 1;
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}
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links.push(link_url);
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}
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});
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util.set_topic_links(message, links);
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};
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exports.is_status_message = function (raw_content, content) {
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return raw_content.indexOf('/me ') === 0 &&
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raw_content.indexOf('\n') === -1 &&
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content.indexOf('<p>') === 0 &&
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content.lastIndexOf('</p>') === content.length - 4;
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};
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function handleUnicodeEmoji(unicode_emoji) {
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var codepoint = unicode_emoji.codePointAt(0).toString(16);
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if (emoji_codes.codepoint_to_name.hasOwnProperty(codepoint)) {
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var emoji_name = emoji_codes.codepoint_to_name[codepoint];
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var alt_text = ':' + emoji_name + ':';
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var title = emoji_name.split("_").join(" ");
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return '<span class="emoji emoji-' + codepoint + '"' +
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' title="' + title + '">' + alt_text +
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'</span>';
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}
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return unicode_emoji;
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}
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function handleEmoji(emoji_name) {
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var alt_text = ':' + emoji_name + ':';
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var title = emoji_name.split("_").join(" ");
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if (emoji.active_realm_emojis.hasOwnProperty(emoji_name)) {
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var emoji_url = emoji.active_realm_emojis[emoji_name].emoji_url;
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return '<img alt="' + alt_text + '"' +
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' class="emoji" src="' + emoji_url + '"' +
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' title="' + title + '">';
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} else if (emoji_codes.name_to_codepoint.hasOwnProperty(emoji_name)) {
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var codepoint = emoji_codes.name_to_codepoint[emoji_name];
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return '<span class="emoji emoji-' + codepoint + '"' +
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' title="' + title + '">' + alt_text +
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'</span>';
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}
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return alt_text;
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}
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function handleAvatar(email) {
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return '<img alt="' + email + '"' +
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' class="message_body_gravatar" src="/avatar/' + email + '?s=30"' +
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' title="' + email + '">';
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}
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function handleStream(streamName) {
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var stream = stream_data.get_sub(streamName);
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if (stream === undefined) {
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return;
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}
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var href = window.location.origin + '/#narrow/stream/' + hash_util.encode_stream_name(stream.name);
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return '<a class="stream" data-stream-id="' + stream.stream_id + '" ' +
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'href="' + href + '"' +
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'>' + '#' + escape(stream.name) + '</a>';
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}
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function handleRealmFilter(pattern, matches) {
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var url = realm_filter_map[pattern];
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var current_group = 1;
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_.each(matches, function (match) {
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var back_ref = "\\" + current_group;
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url = url.replace(back_ref, match);
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current_group += 1;
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});
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return url;
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}
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function handleTex(tex, fullmatch) {
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try {
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return katex.renderToString(tex);
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} catch (ex) {
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if (ex.message.indexOf('KaTeX parse error') === 0) { // TeX syntax error
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return '<span class="tex-error">' + escape(fullmatch) + '</span>';
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}
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blueslip.error(ex);
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}
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}
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function python_to_js_filter(pattern, url) {
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// Converts a python named-group regex to a javascript-compatible numbered
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// group regex... with a regex!
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var named_group_re = /\(?P<([^>]+?)>/g;
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var match = named_group_re.exec(pattern);
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var current_group = 1;
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while (match) {
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var name = match[1];
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// Replace named group with regular matching group
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pattern = pattern.replace('(?P<' + name + '>', '(');
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// Replace named reference in url to numbered reference
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url = url.replace('%(' + name + ')s', '\\' + current_group);
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match = named_group_re.exec(pattern);
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current_group += 1;
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}
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// Convert any python in-regex flags to RegExp flags
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var js_flags = 'g';
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var inline_flag_re = /\(\?([iLmsux]+)\)/;
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match = inline_flag_re.exec(pattern);
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// JS regexes only support i (case insensitivity) and m (multiline)
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// flags, so keep those and ignore the rest
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if (match) {
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var py_flags = match[1].split("");
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_.each(py_flags, function (flag) {
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if ("im".indexOf(flag) !== -1) {
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js_flags += flag;
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}
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});
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pattern = pattern.replace(inline_flag_re, "");
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}
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// Ideally we should have been checking that realm filters
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// begin with certain characters but since there is no
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// support for negative lookbehind in javascript, we check
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// for this condition in `contains_backend_only_syntax()`
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// function. If the condition is satisfied then the message
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// is rendered locally, otherwise, we return false there and
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// message is rendered on the backend which has proper support
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// for negative lookbehind.
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pattern = pattern + /(?![\w])/.source;
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return [new RegExp(pattern, js_flags), url];
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}
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exports.set_realm_filters = function (realm_filters) {
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// Update the marked parser with our particular set of realm filters
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realm_filter_map = {};
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realm_filter_list = [];
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var marked_rules = [];
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_.each(realm_filters, function (realm_filter) {
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var pattern = realm_filter[0];
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var url = realm_filter[1];
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var js_filters = python_to_js_filter(pattern, url);
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realm_filter_map[js_filters[0]] = js_filters[1];
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realm_filter_list.push([js_filters[0], js_filters[1]]);
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marked_rules.push(js_filters[0]);
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});
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marked.InlineLexer.rules.zulip.realm_filters = marked_rules;
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};
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var preprocess_auto_olists = (function () {
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var TAB_LENGTH = 2;
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var re = /^( *)(\d+)\. +(.*)/;
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function getIndent(match) {
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return Math.floor(match[1].length / TAB_LENGTH);
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}
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function extendArray(arr, arr2) {
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Array.prototype.push.apply(arr, arr2);
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}
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function renumber(mlist) {
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if (!mlist.length) {
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return [];
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}
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var startNumber = parseInt(mlist[0][2], 10);
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var changeNumbers = _.every(mlist, function (m) {
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return startNumber === parseInt(m[2], 10);
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});
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var counter = startNumber;
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return _.map(mlist, function (m) {
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var number = changeNumbers ? counter.toString() : m[2];
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counter += 1;
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return m[1] + number + '. ' + m[3];
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});
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}
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return function (src) {
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var newLines = [];
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var currentList = [];
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var currentIndent = 0;
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_.each(src.split('\n'), function (line) {
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var m = line.match(re);
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var isNextItem = m && currentList.length && currentIndent === getIndent(m);
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if (!isNextItem) {
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extendArray(newLines, renumber(currentList));
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currentList = [];
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}
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if (!m) {
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newLines.push(line);
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} else if (isNextItem) {
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currentList.push(m);
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} else {
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currentList = [m];
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currentIndent = getIndent(m);
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}
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});
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extendArray(newLines, renumber(currentList));
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return newLines.join('\n');
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};
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}());
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exports.initialize = function () {
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function disable_markdown_regex(rules, name) {
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rules[name] = {exec: function () {
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return false;
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}};
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}
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// Configure the marked markdown parser for our usage
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var r = new marked.Renderer();
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// No <code> around our code blocks instead a codehilite <div> and disable
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// class-specific highlighting.
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r.code = function (code) {
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return '<div class="codehilite"><pre>'
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+ escape(code, true)
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+ '\n</pre></div>\n\n\n';
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};
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// Our links have title= and target=_blank
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r.link = function (href, title, text) {
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title = title || href;
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var out = '<a href="' + href + '"' + ' target="_blank" title="' +
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title + '"' + '>' + text + '</a>';
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return out;
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};
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// Put a newline after a <br> in the generated HTML to match bugdown
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r.br = function () {
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return '<br>\n';
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};
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function preprocess_code_blocks(src) {
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return fenced_code.process_fenced_code(src);
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}
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function preprocess_translate_emoticons(src) {
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if (!page_params.translate_emoticons) {
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return src;
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}
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// In this scenario, the message has to be from the user, so the only
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// requirement should be that they have the setting on.
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return emoji.translate_emoticons_to_names(src);
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}
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// Disable ordered lists
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// We used GFM + tables, so replace the list start regex for that ruleset
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// We remove the |[\d+]\. that matches the numbering in a numbered list
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marked.Lexer.rules.tables.list = /^( *)((?:\*)) [\s\S]+?(?:\n+(?=(?: *[\-*_]){3,} *(?:\n+|$))|\n{2,}(?! )(?!\1(?:\*) )\n*|\s*$)/;
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// Disable headings
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disable_markdown_regex(marked.Lexer.rules.tables, 'heading');
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disable_markdown_regex(marked.Lexer.rules.tables, 'lheading');
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// Disable __strong__ (keeping **strong**)
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marked.InlineLexer.rules.zulip.strong = /^\*\*([\s\S]+?)\*\*(?!\*)/;
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// Make sure <del> syntax matches the backend processor
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marked.InlineLexer.rules.zulip.del = /^(?!<\~)\~\~([^~]+)\~\~(?!\~)/;
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// Disable _emphasis_ (keeping *emphasis*)
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// Text inside ** must start and end with a word character
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// to prevent mis-parsing things like "char **x = (char **)y"
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marked.InlineLexer.rules.zulip.em = /^\*(?!\s+)((?:\*\*|[\s\S])+?)((?:[\S]))\*(?!\*)/;
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// Disable autolink as (a) it is not used in our backend and (b) it interferes with @mentions
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disable_markdown_regex(marked.InlineLexer.rules.zulip, 'autolink');
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exports.set_realm_filters(page_params.realm_filters);
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// Tell our fenced code preprocessor how to insert arbitrary
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// HTML into the output. This generated HTML is safe to not escape
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fenced_code.set_stash_func(function (html) {
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return marked.stashHtml(html, true);
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});
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fenced_code.set_escape_func(escape);
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marked.setOptions({
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gfm: true,
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tables: true,
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breaks: true,
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pedantic: false,
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sanitize: true,
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smartLists: true,
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smartypants: false,
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zulip: true,
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emojiHandler: handleEmoji,
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avatarHandler: handleAvatar,
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unicodeEmojiHandler: handleUnicodeEmoji,
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streamHandler: handleStream,
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realmFilterHandler: handleRealmFilter,
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texHandler: handleTex,
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renderer: r,
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preprocessors: [
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preprocess_code_blocks,
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preprocess_auto_olists,
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preprocess_translate_emoticons,
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],
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});
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};
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return exports;
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}());
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if (typeof module !== 'undefined') {
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module.exports = markdown;
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}
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window.markdown = markdown;
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