UNPKG

showdown

Version:

A Markdown to HTML converter written in Javascript

71 lines (63 loc) 2.91 kB
showdown.subParser('italicsAndBold', function (text, options, globals) { 'use strict'; text = globals.converter._dispatch('italicsAndBold.before', text, options, globals); // it's faster to have 3 separate regexes for each case than have just one // because of backtracing, in some cases, it could lead to an exponential effect // called "catastrophic backtrace". Ominous! function parseInside (txt, left, right) { /* if (options.simplifiedAutoLink) { txt = showdown.subParser('simplifiedAutoLinks')(txt, options, globals); } */ return left + txt + right; } // Parse underscores if (options.literalMidWordUnderscores) { text = text.replace(/\b___(\S[\s\S]*)___\b/g, function (wm, txt) { return parseInside (txt, '<strong><em>', '</em></strong>'); }); text = text.replace(/\b__(\S[\s\S]*)__\b/g, function (wm, txt) { return parseInside (txt, '<strong>', '</strong>'); }); text = text.replace(/\b_(\S[\s\S]*?)_\b/g, function (wm, txt) { return parseInside (txt, '<em>', '</em>'); }); } else { text = text.replace(/___(\S[\s\S]*?)___/g, function (wm, m) { return (/\S$/.test(m)) ? parseInside (m, '<strong><em>', '</em></strong>') : wm; }); text = text.replace(/__(\S[\s\S]*?)__/g, function (wm, m) { return (/\S$/.test(m)) ? parseInside (m, '<strong>', '</strong>') : wm; }); text = text.replace(/_([^\s_][\s\S]*?)_/g, function (wm, m) { // !/^_[^_]/.test(m) - test if it doesn't start with __ (since it seems redundant, we removed it) return (/\S$/.test(m)) ? parseInside (m, '<em>', '</em>') : wm; }); } // Now parse asterisks if (options.literalMidWordAsterisks) { text = text.replace(/([^*]|^)\B\*\*\*(\S[\s\S]+?)\*\*\*\B(?!\*)/g, function (wm, lead, txt) { return parseInside (txt, lead + '<strong><em>', '</em></strong>'); }); text = text.replace(/([^*]|^)\B\*\*(\S[\s\S]+?)\*\*\B(?!\*)/g, function (wm, lead, txt) { return parseInside (txt, lead + '<strong>', '</strong>'); }); text = text.replace(/([^*]|^)\B\*(\S[\s\S]+?)\*\B(?!\*)/g, function (wm, lead, txt) { return parseInside (txt, lead + '<em>', '</em>'); }); } else { text = text.replace(/\*\*\*(\S[\s\S]*?)\*\*\*/g, function (wm, m) { return (/\S$/.test(m)) ? parseInside (m, '<strong><em>', '</em></strong>') : wm; }); text = text.replace(/\*\*(\S[\s\S]*?)\*\*/g, function (wm, m) { return (/\S$/.test(m)) ? parseInside (m, '<strong>', '</strong>') : wm; }); text = text.replace(/\*([^\s*][\s\S]*?)\*/g, function (wm, m) { // !/^\*[^*]/.test(m) - test if it doesn't start with ** (since it seems redundant, we removed it) return (/\S$/.test(m)) ? parseInside (m, '<em>', '</em>') : wm; }); } text = globals.converter._dispatch('italicsAndBold.after', text, options, globals); return text; });