: str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in
text = globals.converter._dispatch('italicsAndBold.before', text, options, globals);
// it's faster to have 3 separate regexes for each case than have just one
// because of backtracing, in some cases, it could lead to an exponential effect
// called "catastrophic backtrace". Ominous!
function parseInside (txt, left, right) {
if (options.simplifiedAutoLink) {
txt = showdown.subParser('simplifiedAutoLinks')(txt, options, globals);
return left + txt + right;
if (options.literalMidWordUnderscores) {
text = text.replace(/\b___(\S[\s\S]*?)___\b/g, function (wm, txt) {
return parseInside (txt, '<strong><em>', '</em></strong>');
text = text.replace(/\b__(\S[\s\S]*?)__\b/g, function (wm, txt) {
return parseInside (txt, '<strong>', '</strong>');
text = text.replace(/\b_(\S[\s\S]*?)_\b/g, function (wm, txt) {
return parseInside (txt, '<em>', '</em>');
text = text.replace(/___(\S[\s\S]*?)___/g, function (wm, m) {
return (/\S$/.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;
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>');
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);
* Form HTML ordered (numbered) and unordered (bulleted) lists.
showdown.subParser('lists', function (text, options, globals) {
* Process the contents of a single ordered or unordered list, splitting it
* into individual list items.
* @param {string} listStr
* @param {boolean} trimTrailing
function processListItems (listStr, trimTrailing) {
// The $g_list_level global keeps track of when we're inside a list.
// Each time we enter a list, we increment it; when we leave a list,
// we decrement. If it's zero, we're not in a list anymore.
// We do this because when we're not inside a list, we want to treat
// I recommend upgrading to version
// 8. Oops, now this line is treated
// As a single paragraph, despite the fact that the second line starts
// with a digit-period-space sequence.
// Whereas when we're inside a list (or sub-list), that line will be
// treated as the start of a sub-list. What a kludge, huh? This is
// an aspect of Markdown's syntax that's hard to parse perfectly
// without resorting to mind-reading. Perhaps the solution is to
// change the syntax rules such that sub-lists must start with a
// starting cardinal number; e.g. "1." or "a.".
// trim trailing blank lines:
listStr = listStr.replace(/\n{2,}$/, '\n');
// attacklab: add sentinel to emulate \z
var rgx = /(\n)?(^ {0,3})([*+-]|\d+[.])[ \t]+((\[(x|X| )?])?[ \t]*[^\r]+?(\n{1,2}))(?=\n*(¨0| {0,3}([*+-]|\d+[.])[ \t]+))/gm,
isParagraphed = (/\n[ \t]*\n(?!¨0)/.test(listStr));
// Since version 1.5, nesting sublists requires 4 spaces (or 1 tab) indentation,
// which is a syntax breaking change
// activating this option reverts to old behavior
if (options.disableForced4SpacesIndentedSublists) {
rgx = /(\n)?(^ {0,3})([*+-]|\d+[.])[ \t]+((\[(x|X| )?])?[ \t]*[^\r]+?(\n{1,2}))(?=\n*(¨0|\2([*+-]|\d+[.])[ \t]+))/gm;
listStr = listStr.replace(rgx, function (wholeMatch, m1, m2, m3, m4, taskbtn, checked) {
checked = (checked && checked.trim() !== '');
var item = showdown.subParser('outdent')(m4, options, globals),
// Support for github tasklists
if (taskbtn && options.tasklists) {
bulletStyle = ' class="task-list-item" style="list-style-type: none;"';
item = item.replace(/^[ \t]*\[(x|X| )?]/m, function () {
var otp = '<input type="checkbox" disabled style="margin: 0px 0.35em 0.25em -1.6em; vertical-align: middle;"';
// causes trouble to the parser, since it interprets it as:
// <ul><li><li><li>a</li></li></li></ul>
// <ul><li>- - a</li></ul>
// So, to prevent it, we will put a marker (¨A)in the beginning of the line
// Kind of hackish/monkey patching, but seems more effective than overcomplicating the list parser
item = item.replace(/^([-*+]|\d\.)[ \t]+[\S\n ]*/g, function (wm2) {
// Has a double return (multi paragraph) or
if (m1 || (item.search(/\n{2,}/) > -1)) {
item = showdown.subParser('githubCodeBlocks')(item, options, globals);
item = showdown.subParser('blockGamut')(item, options, globals);
// Recursion for sub-lists:
item = showdown.subParser('lists')(item, options, globals);
item = item.replace(/\n$/, ''); // chomp(item)
item = showdown.subParser('hashHTMLBlocks')(item, options, globals);
// Colapse double linebreaks
item = item.replace(/\n\n+/g, '\n\n');
item = showdown.subParser('paragraphs')(item, options, globals);
item = showdown.subParser('spanGamut')(item, options, globals);
// now we need to remove the marker (¨A)
item = item.replace('¨A', '');
// we can finally wrap the line in list item tags
item = '<li' + bulletStyle + '>' + item + '</li>\n';
// attacklab: strip sentinel
listStr = listStr.replace(/¨0/g, '');
listStr = listStr.replace(/\s+$/, '');
function styleStartNumber (list, listType) {
// check if ol and starts by a number different than 1
var res = list.match(/^ *(\d+)\./);
if (res && res[1] !== '1') {
return ' start="' + res[1] + '"';
* Check and parse consecutive lists (better fix for issue #142)
* @param {string} listType
* @param {boolean} trimTrailing
function parseConsecutiveLists (list, listType, trimTrailing) {
// check if we caught 2 or more consecutive lists by mistake
// we use the counterRgx, meaning if listType is UL we look for OL and vice versa
var olRgx = (options.disableForced4SpacesIndentedSublists) ? /^ ?\d+\.[ \t]/gm : /^ {0,3}\d+\.[ \t]/gm,
ulRgx = (options.disableForced4SpacesIndentedSublists) ? /^ ?[*+-][ \t]/gm : /^ {0,3}[*+-][ \t]/gm,
counterRxg = (listType === 'ul') ? olRgx : ulRgx,
if (list.search(counterRxg) !== -1) {
(function parseCL (txt) {
var pos = txt.search(counterRxg),
style = styleStartNumber(list, listType);
result += '\n\n<' + listType + style + '>\n' + processListItems(txt.slice(0, pos), !!trimTrailing) + '</' + listType + '>\n';
// invert counterType and listType
listType = (listType === 'ul') ? 'ol' : 'ul';
counterRxg = (listType === 'ul') ? olRgx : ulRgx;
result += '\n\n<' + listType + style + '>\n' + processListItems(txt, !!trimTrailing) + '</' + listType + '>\n';
var style = styleStartNumber(list, listType);
result = '\n\n<' + listType + style + '>\n' + processListItems(list, !!trimTrailing) + '</' + listType + '>\n';
/** Start of list parsing **/
text = globals.converter._dispatch('lists.before', text, options, globals);
// add sentinel to hack around khtml/safari bug:
// http://bugs.webkit.org/show_bug.cgi?id=11231
if (globals.gListLevel) {
text = text.replace(/^(( {0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(¨0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm,
function (wholeMatch, list, m2) {
var listType = (m2.search(/[*+-]/g) > -1) ? 'ul' : 'ol';
return parseConsecutiveLists(list, listType, true);
text = text.replace(/(\n\n|^\n?)(( {0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(¨0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm,
function (wholeMatch, m1, list, m3) {
var listType = (m3.search(/[*+-]/g) > -1) ? 'ul' : 'ol';
return parseConsecutiveLists(list, listType, false);
text = text.replace(/¨0/, '');
text = globals.converter._dispatch('lists.after', text, options, globals);
* Parse metadata at the top of the document
showdown.subParser('metadata', function (text, options, globals) {
text = globals.converter._dispatch('metadata.before', text, options, globals);
function parseMetadataContents (content) {
// raw is raw so it's not changed in any way
globals.metadata.raw = content;
// escape chars forbidden in html attributes
.replace(/"/g, '"');
content = content.replace(/\n {4}/g, ' ');
content.replace(/^([\S ]+): +([\s\S]+?)$/gm, function (wm, key, value) {
globals.metadata.parsed[key] = value;
text = text.replace(/^\s*«««+(\S*?)\n([\s\S]+?)\n»»»+\n/, function (wholematch, format, content) {
parseMetadataContents(content);
text = text.replace(/^\s*---+(\S*?)\n([\s\S]+?)\n---+\n/, function (wholematch, format, content) {
globals.metadata.format = format;
parseMetadataContents(content);
text = text.replace(/¨M/g, '');
text = globals.converter._dispatch('metadata.after', text, options, globals);
* Remove one level of line-leading tabs or spaces
showdown.subParser('outdent', function (text, options, globals) {
text = globals.converter._dispatch('outdent.before', text, options, globals);
// attacklab: hack around Konqueror 3.5.4 bug:
// "----------bug".replace(/^-/g,"") == "bug"
text = text.replace(/^(\t|[ ]{1,4})/gm, '¨0'); // attacklab: g_tab_width
// attacklab: clean up hack
text = text.replace(/¨0/g, '');
text = globals.converter._dispatch('outdent.after', text, options, globals);
showdown.subParser('paragraphs', function (text, options, globals) {
text = globals.converter._dispatch('paragraphs.before', text, options, globals);
// Strip leading and trailing lines:
text = text.replace(/^\n+/g, '');
text = text.replace(/\n+$/g, '');
var grafs = text.split(/\n{2,}/g),
end = grafs.length; // Wrap <p> tags
for (var i = 0; i < end; i++) {
// if this is an HTML marker, copy it
if (str.search(/¨(K|G)(\d+)\1/g) >= 0) {
// test for presence of characters to prevent empty lines being parsed
// as paragraphs (resulting in undesired extra empty paragraphs)
} else if (str.search(/\S/) >= 0) {
str = showdown.subParser('spanGamut')(str, options, globals);
str = str.replace(/^([ \t]*)/g, '<p>');
/** Unhashify HTML blocks */
for (i = 0; i < end; i++) {
grafsOutIt = grafsOut[i],
// if this is a marker for an html block...
// use RegExp.test instead of string.search because of QML bug
while (/¨(K|G)(\d+)\1/.test(grafsOutIt)) {
blockText = globals.gHtmlBlocks[num];
// we need to check if ghBlock is a false positive
// use encoded version of all text
blockText = showdown.subParser('encodeCode')(globals.ghCodeBlocks[num].text, options, globals);
blockText = globals.ghCodeBlocks[num].codeblock;
blockText = blockText.replace(/\$/g, '$$$$'); // Escape any dollar signs
grafsOutIt = grafsOutIt.replace(/(\n\n)?¨(K|G)\d+\2(\n\n)?/, blockText);
// Check if grafsOutIt is a pre->code
if (/^<pre\b[^>]*>\s*<code\b[^>]*>/.test(grafsOutIt)) {
grafsOut[i] = grafsOutIt;
text = grafsOut.join('\n');
// Strip leading and trailing lines:
text = text.replace(/^\n+/g, '');
text = text.replace(/\n+$/g, '');
return globals.converter._dispatch('paragraphs.after', text, options, globals);
showdown.subParser('runExtension', function (ext, text, options, globals) {
text = ext.filter(text, globals.converter, options);
// TODO remove this when old extension loading mechanism is deprecated
if (!(re instanceof RegExp)) {
re = new RegExp(re, 'g');
text = text.replace(re, ext.replace);
* These are all the transformations that occur *within* block-level
* tags like paragraphs, headers, and list items.
showdown.subParser('spanGamut', function (text, options, globals) {
text = globals.converter._dispatch('spanGamut.before', text, options, globals);
text = showdown.subParser('codeSpans')(text, options, globals);
text = showdown.subParser('escapeSpecialCharsWithinTagAttributes')(text, options, globals);
text = showdown.subParser('encodeBackslashEscapes')(text, options, globals);
// Process anchor and image tags. Images must come first,
// because ![foo][f] looks like an anchor.
text = showdown.subParser('images')(text, options, globals);
text = showdown.subParser('anchors')(text, options, globals);
// Make links out of things like `<http://example.com/>`
// Must come after anchors, because you can use < and >
// delimiters in inline links like [this](<url>).
text = showdown.subParser('autoLinks')(text, options, globals);
text = showdown.subParser('simplifiedAutoLinks')(text, options, globals);
text = showdown.subParser('emoji')(text, options, globals);
text = showdown.subParser('underline')(text, options, globals);
text = showdown.subParser('italicsAndBold')(text, options, globals);
text = showdown.subParser('strikethrough')(text, options, globals);
text = showdown.subParser('ellipsis')(text, options, globals);
// we need to hash HTML tags inside spans
text = showdown.subParser('hashHTMLSpans')(text, options, globals);
// now we encode amps and angles
text = showdown.subParser('encodeAmpsAndAngles')(text, options, globals);
if (options.simpleLineBreaks) {
// only add line breaks if the text does not contain a block (special case for lists)
if (!/\n\n¨K/.test(text)) {
text = text.replace(/\n+/g, '<br />\n');
text = text.replace(/ +\n/g, '<br />\n');
text = globals.converter._dispatch('spanGamut.after', text, options, globals);
showdown.subParser('strikethrough', function (text, options, globals) {
function parseInside (txt) {
if (options.simplifiedAutoLink) {
txt = showdown.subParser('simplifiedAutoLinks')(txt, options, globals);
return '<del>' + txt + '</del>';
if (options.strikethrough) {
text = globals.converter._dispatch('strikethrough.before', text, options, globals);
text = text.replace(/(?:~){2}([\s\S]+?)(?:~){2}/g, function (wm, txt) { return parseInside(txt); });
text = globals.converter._dispatch('strikethrough.after', text, options, globals);
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
