2 // showdown.js -- A javascript port of Markdown.
4 // Copyright (c) 2007 John Fraser.
6 // Original Markdown Copyright (c) 2004-2005 John Gruber
7 // <http://daringfireball.net/projects/markdown/>
9 // Redistributable under a BSD-style open source license.
10 // See license.txt for more information.
12 // The full source distribution is at:
18 // <http://www.attacklab.net/>
22 // Wherever possible, Showdown is a straight, line-by-line port
23 // of the Perl version of Markdown.
25 // This is not a normal parser design; it's basically just a
26 // series of string substitutions. It's hard to read and
27 // maintain this way, but keeping Showdown close to the original
28 // design makes it easier to port new features.
30 // More importantly, Showdown behaves like markdown.pl in most
31 // edge cases. So web applications can do client-side preview
32 // in Javascript, and then build identical HTML on the server.
34 // This port needs the new RegExp functionality of ECMA 262,
35 // 3rd Edition (i.e. Javascript 1.5). Most modern web browsers
36 // should do fine. Even with the new regular expression features,
37 // We do a lot of work to emulate Perl's regex functionality.
38 // The tricky changes in this file mostly have the "attacklab:"
39 // label. Major or self-explanatory changes don't.
41 // Smart diff tools like Araxis Merge will be able to match up
42 // this file with markdown.pl in a useful way. A little tweaking
43 // helps: in a copy of markdown.pl, replace "#" with "//" and
44 // replace "$text" with "text". Be sure to ignore whitespace
52 // alert( Roo.ux.Showdown.toHtml("Markdown *rocks*.") );
54 // Note: move the sample code to the bottom of this
55 // file before uncommenting it.
62 Roo.namespace('Roo.ux');
64 Roo.ux.Showdown.toHtml = function(text) {
65 var c = new Roo.ux.Showdown.converter();
66 return c.makeHtml(text);
71 // Wraps all "globals" so that the only thing
72 // exposed is makeHtml().
74 Roo.ux.Showdown.converter = function() {
80 // Global hashes, used by various utility routines
85 // Used to track when we're inside an ordered or unordered list
86 // (see _ProcessListItems() for details):
90 this.makeHtml = function(_text) {
92 // Main function. The order in which other subs are called here is
93 // essential. Link and image substitutions need to happen before
94 // _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
95 // and <img> tags get encoded.
98 // Clear the global hashes. If we don't clear these, you get conflicts
99 // from other articles when generating a page which contains more than
100 // one article (e.g. an index page that shows the N most recent
102 g_urls = new Array();
103 g_titles = new Array();
104 g_html_blocks = new Array();
106 // attacklab: Replace ~ with ~T
107 // This lets us use tilde as an escape char to avoid md5 hashes
108 // The choice of character is arbitray; anything that isn't
109 // magic in Markdown will work.
110 text = text.replace(/~/g,"~T");
112 // attacklab: Replace $ with ~D
113 // RegExp interprets $ as a special character
114 // when it's in a replacement string
115 text = text.replace(/\$/g,"~D");
117 // Standardize line endings
118 text = text.replace(/\r\n/g,"\n"); // DOS to Unix
119 text = text.replace(/\r/g,"\n"); // Mac to Unix
121 // Make sure text begins and ends with a couple of newlines:
122 text = "\n\n" + text + "\n\n";
124 // Convert all tabs to spaces.
127 // Strip any lines consisting only of spaces and tabs.
128 // This makes subsequent regexen easier to write, because we can
129 // match consecutive blank lines with /\n+/ instead of something
130 // contorted like /[ \t]*\n+/ .
131 text = text.replace(/^[ \t]+$/mg,"");
133 // Turn block-level HTML blocks into hash entries
134 text = _HashHTMLBlocks(text);
136 // Strip link definitions, store in hashes.
137 text = _StripLinkDefinitions(text);
139 text = _RunBlockGamut(text);
141 text = _UnescapeSpecialChars(text);
143 // attacklab: Restore dollar signs
144 text = text.replace(/~D/g,"$$");
146 // attacklab: Restore tildes
147 text = text.replace(/~T/g,"~");
153 var _StripLinkDefinitions = function(text) {
155 // Strips link definitions from text, stores the URLs and titles in
159 // Link defs are in the form: ^[id]: url "optional title"
162 var text = text.replace(/
163 ^[ ]{0,3}\[(.+)\]: // id = $1 attacklab: g_tab_width - 1
165 \n? // maybe *one* newline
167 <?(\S+?)>? // url = $2
169 \n? // maybe one newline
172 (\n*) // any lines skipped = $3 attacklab: lookbehind removed
177 )? // title is optional
182 text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|\Z)/gm,
183 function (wholeMatch,m1,m2,m3,m4) {
184 m1 = m1.toLowerCase();
185 g_urls[m1] = _EncodeAmpsAndAngles(m2); // Link IDs are case-insensitive
187 // Oops, found blank lines, so it's not a title.
188 // Put back the parenthetical statement we stole.
191 g_titles[m1] = m4.replace(/"/g,""");
194 // Completely remove the definition from the text
203 var _HashHTMLBlocks = function(text) {
204 // attacklab: Double up blank lines to reduce lookaround
205 text = text.replace(/\n/g,"\n\n");
207 // Hashify HTML blocks:
208 // We only want to do this for block-level HTML tags, such as headers,
209 // lists, and tables. That's because we still want to wrap <p>s around
210 // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
211 // phrase emphasis, and spans. The list of tags we're looking for is
213 var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del"
214 var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"
216 // First, look for nested blocks, e.g.:
219 // tags for inner block must be indented.
223 // The outermost tags must start at the left margin for this to match, and
224 // the inner nested divs must be indented.
225 // We need to do this before the next, more liberal match, because the next
226 // match will start at the first `<div>` and stop at the first `</div>`.
228 // attacklab: This regex can be expensive when it fails.
230 var text = text.replace(/
232 ^ // start of line (with /m)
233 <($block_tags_a) // start tag = $2
235 // attacklab: hack around khtml/pcre bug...
236 [^\r]*?\n // any number of lines, minimally matching
237 </\2> // the matching end tag
238 [ \t]* // trailing spaces/tabs
239 (?=\n+) // followed by a newline
240 ) // attacklab: there are sentinel newlines at end of document
241 /gm,function(){...}};
243 text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm,hashElement);
246 // Now match more liberally, simply from `\n<tag>` to `</tag>\n`
250 var text = text.replace(/
252 ^ // start of line (with /m)
253 <($block_tags_b) // start tag = $2
255 // attacklab: hack around khtml/pcre bug...
256 [^\r]*? // any number of lines, minimally matching
257 .*</\2> // the matching end tag
258 [ \t]* // trailing spaces/tabs
259 (?=\n+) // followed by a newline
260 ) // attacklab: there are sentinel newlines at end of document
261 /gm,function(){...}};
263 text = text.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm,hashElement);
265 // Special case just for <hr />. It was easier to make a special case than
266 // to make the other regex more complicated.
269 text = text.replace(/
271 \n\n // Starting after a blank line
273 (<(hr) // start tag = $2
276 \/?>) // the matching end tag
278 (?=\n{2,}) // followed by a blank line
282 text = text.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,hashElement);
284 // Special case for standalone HTML comments:
287 text = text.replace(/
289 \n\n // Starting after a blank line
290 [ ]{0,3} // attacklab: g_tab_width - 1
295 (?=\n{2,}) // followed by a blank line
299 text = text.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,hashElement);
301 // PHP and ASP-style processor instructions (<?...?> and <%...%>)
304 text = text.replace(/
306 \n\n // Starting after a blank line
309 [ ]{0,3} // attacklab: g_tab_width - 1
316 (?=\n{2,}) // followed by a blank line
320 text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,hashElement);
322 // attacklab: Undo double lines (see comment at top of this function)
323 text = text.replace(/\n\n/g,"\n");
327 var hashElement = function(wholeMatch,m1) {
331 blockText = blockText.replace(/\n\n/g,"\n");
332 blockText = blockText.replace(/^\n/,"");
334 // strip trailing blank lines
335 blockText = blockText.replace(/\n+$/g,"");
337 // Replace the element text with a marker ("~KxK" where x is its key)
338 blockText = "\n\n~K" + (g_html_blocks.push(blockText)-1) + "K\n\n";
343 var _RunBlockGamut = function(text) {
345 // These are all the transformations that form block-level
346 // tags like paragraphs, headers, and list items.
348 text = _DoHeaders(text);
350 // Do Horizontal Rules:
351 var key = hashBlock("<hr />");
352 text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm,key);
353 text = text.replace(/^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$/gm,key);
354 text = text.replace(/^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$/gm,key);
356 text = _DoLists(text);
357 text = _DoCodeBlocks(text);
358 text = _DoBlockQuotes(text);
360 // We already ran _HashHTMLBlocks() before, in Markdown(), but that
361 // was to escape raw HTML in the original Markdown source. This time,
362 // we're escaping the markup we've just created, so that we don't wrap
363 // <p> tags around block-level tags.
364 text = _HashHTMLBlocks(text);
365 text = _FormParagraphs(text);
371 var _RunSpanGamut = function(text) {
373 // These are all the transformations that occur *within* block-level
374 // tags like paragraphs, headers, and list items.
377 text = _DoCodeSpans(text);
378 text = _EscapeSpecialCharsWithinTagAttributes(text);
379 text = _EncodeBackslashEscapes(text);
381 // Process anchor and image tags. Images must come first,
382 // because ![foo][f] looks like an anchor.
383 text = _DoImages(text);
384 text = _DoAnchors(text);
386 // Make links out of things like `<http://example.com/>`
387 // Must come after _DoAnchors(), because you can use < and >
388 // delimiters in inline links like [this](<url>).
389 text = _DoAutoLinks(text);
390 text = _EncodeAmpsAndAngles(text);
391 text = _DoItalicsAndBold(text);
394 text = text.replace(/ +\n/g," <br />\n");
399 var _EscapeSpecialCharsWithinTagAttributes = function(text) {
401 // Within tags -- meaning between < and > -- encode [\ ` * _] so they
402 // don't conflict with their use in Markdown for code, italics and strong.
405 // Build a regex to find HTML tags and comments. See Friedl's
406 // "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
407 var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--.*?--\s*)+>)/gi;
409 text = text.replace(regex, function(wholeMatch) {
410 var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g,"$1`");
411 tag = escapeCharacters(tag,"\\`*_");
418 var _DoAnchors = function(text) {
420 // Turn Markdown link shortcuts into XHTML <a> tags.
423 // First, handle reference-style links: [link text] [id]
427 text = text.replace(/
428 ( // wrap whole match in $1
432 \[[^\]]*\] // allow brackets nested one level
434 [^\[] // or anything else
439 [ ]? // one optional space
440 (?:\n[ ]*)? // one optional newline followed by spaces
445 )()()()() // pad remaining backreferences
446 /g,_DoAnchors_callback);
448 text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeAnchorTag);
451 // Next, inline-style links: [link text](url "optional title")
455 text = text.replace(/
456 ( // wrap whole match in $1
460 \[[^\]]*\] // allow brackets nested one level
462 [^\[\]] // or anything else
468 () // no id, so leave $3 empty
469 <?(.*?)>? // href = $4
472 (['"]) // quote char = $6
475 [ \t]* // ignore any spaces/tabs between closing quote and )
476 )? // title is optional
481 text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeAnchorTag);
484 // Last, handle reference-style shortcuts: [link text]
485 // These must come last in case you've also got [link test][1]
486 // or [link test](/foo)
490 text = text.replace(/
491 ( // wrap whole match in $1
493 ([^\[\]]+) // link text = $2; can't contain '[' or ']'
495 )()()()()() // pad rest of backreferences
498 text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);
503 var writeAnchorTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
504 if (m7 == undefined) m7 = "";
505 var whole_match = m1;
507 var link_id = m3.toLowerCase();
513 // lower-case and turn embedded newlines into spaces
514 link_id = link_text.toLowerCase().replace(/ ?\n/g," ");
518 if (g_urls[link_id] != undefined) {
519 url = g_urls[link_id];
520 if (g_titles[link_id] != undefined) {
521 title = g_titles[link_id];
525 if (whole_match.search(/\(\s*\)$/m)>-1) {
526 // Special case for explicit empty url
534 url = escapeCharacters(url,"*_");
535 var result = "<a href=\"" + url + "\"";
538 title = title.replace(/"/g,""");
539 title = escapeCharacters(title,"*_");
540 result += " title=\"" + title + "\"";
543 result += ">" + link_text + "</a>";
549 var _DoImages = function(text) {
551 // Turn Markdown image shortcuts into <img> tags.
555 // First, handle reference-style labeled images: ![alt text][id]
559 text = text.replace(/
560 ( // wrap whole match in $1
562 (.*?) // alt text = $2
565 [ ]? // one optional space
566 (?:\n[ ]*)? // one optional newline followed by spaces
571 )()()()() // pad rest of backreferences
574 text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,writeImageTag);
577 // Next, handle inline images: ![alt text](url "optional title")
578 // Don't forget: encode * and _
581 text = text.replace(/
582 ( // wrap whole match in $1
584 (.*?) // alt text = $2
586 \s? // One optional whitespace character
589 () // no id, so leave $3 empty
590 <?(\S+?)>? // src url = $4
593 (['"]) // quote char = $6
597 )? // title is optional
602 text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,writeImageTag);
607 var writeImageTag = function(wholeMatch,m1,m2,m3,m4,m5,m6,m7) {
608 var whole_match = m1;
610 var link_id = m3.toLowerCase();
614 if (!title) title = "";
618 // lower-case and turn embedded newlines into spaces
619 link_id = alt_text.toLowerCase().replace(/ ?\n/g," ");
623 if (g_urls[link_id] != undefined) {
624 url = g_urls[link_id];
625 if (g_titles[link_id] != undefined) {
626 title = g_titles[link_id];
634 alt_text = alt_text.replace(/"/g,""");
635 url = escapeCharacters(url,"*_");
636 var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";
638 // attacklab: Markdown.pl adds empty title attributes to images.
639 // Replicate this bug.
642 title = title.replace(/"/g,""");
643 title = escapeCharacters(title,"*_");
644 result += " title=\"" + title + "\"";
653 var _DoHeaders = function(text) {
655 // Setext-style headers:
662 text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
663 function(wholeMatch,m1){return hashBlock('<h1 id="' + headerId(m1) + '">' + _RunSpanGamut(m1) + "</h1>");});
665 text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
666 function(matchFound,m1){return hashBlock('<h2 id="' + headerId(m1) + '">' + _RunSpanGamut(m1) + "</h2>");});
668 // atx-style headers:
671 // ## Header 2 with closing hashes ##
677 text = text.replace(/
678 ^(\#{1,6}) // $1 = string of #'s
680 (.+?) // $2 = Header text
682 \#* // optional closing #'s (not counted)
684 /gm, function() {...});
687 text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,
688 function(wholeMatch,m1,m2) {
689 var h_level = m1.length;
690 return hashBlock("<h" + h_level + ' id="' + headerId(m2) + '">' + _RunSpanGamut(m2) + "</h" + h_level + ">");
693 function headerId(m) {
694 return m.replace(/[^\w]/g, '').toLowerCase();
699 // This declaration keeps Dojo compressor from outputting garbage:
700 var _ProcessListItems;
702 var _DoLists = function(text) {
704 // Form HTML ordered (numbered) and unordered (bulleted) lists.
707 // attacklab: add sentinel to hack around khtml/safari bug:
708 // http://bugs.webkit.org/show_bug.cgi?id=11231
711 // Re-usable pattern to match any entirel ul or ol list:
717 [ ]{0,3} // attacklab: g_tab_width - 1
718 ([*+-]|\d+[.]) // $3 = first list item marker
723 ~0 // sentinel for workaround; should be $
727 (?! // Negative lookahead for another list item marker
729 (?:[*+-]|\d+[.])[ \t]+
734 var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;
737 text = text.replace(whole_list,function(wholeMatch,m1,m2) {
739 var list_type = (m2.search(/[*+-]/g)>-1) ? "ul" : "ol";
741 // Turn double returns into triple returns, so that we can make a
742 // paragraph for the last item in a list, if necessary:
743 list = list.replace(/\n{2,}/g,"\n\n\n");;
744 var result = _ProcessListItems(list);
746 // Trim any trailing whitespace, to put the closing `</$list_type>`
747 // up on the preceding line, to get it past the current stupid
748 // HTML block parser. This is a hack to work around the terrible
749 // hack that is the HTML block parser.
750 result = result.replace(/\s+$/,"");
751 result = "<"+list_type+">" + result + "</"+list_type+">\n";
755 whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
756 text = text.replace(whole_list,function(wholeMatch,m1,m2,m3) {
760 var list_type = (m3.search(/[*+-]/g)>-1) ? "ul" : "ol";
761 // Turn double returns into triple returns, so that we can make a
762 // paragraph for the last item in a list, if necessary:
763 var list = list.replace(/\n{2,}/g,"\n\n\n");;
764 var result = _ProcessListItems(list);
765 result = runup + "<"+list_type+">\n" + result + "</"+list_type+">\n";
770 // attacklab: strip sentinel
771 text = text.replace(/~0/,"");
776 _ProcessListItems = function(list_str) {
778 // Process the contents of a single ordered or unordered list, splitting it
779 // into individual list items.
781 // The $g_list_level global keeps track of when we're inside a list.
782 // Each time we enter a list, we increment it; when we leave a list,
783 // we decrement. If it's zero, we're not in a list anymore.
785 // We do this because when we're not inside a list, we want to treat
786 // something like this:
788 // I recommend upgrading to version
789 // 8. Oops, now this line is treated
792 // As a single paragraph, despite the fact that the second line starts
793 // with a digit-period-space sequence.
795 // Whereas when we're inside a list (or sub-list), that line will be
796 // treated as the start of a sub-list. What a kludge, huh? This is
797 // an aspect of Markdown's syntax that's hard to parse perfectly
798 // without resorting to mind-reading. Perhaps the solution is to
799 // change the syntax rules such that sub-lists must start with a
800 // starting cardinal number; e.g. "1." or "a.".
804 // trim trailing blank lines:
805 list_str = list_str.replace(/\n{2,}$/,"\n");
807 // attacklab: add sentinel to emulate \z
811 list_str = list_str.replace(/
812 (\n)? // leading line = $1
813 (^[ \t]*) // leading whitespace = $2
814 ([*+-]|\d+[.]) [ \t]+ // list marker = $3
815 ([^\r]+? // list item text = $4
817 (?= \n* (~0 | \2 ([*+-]|\d+[.]) [ \t]+))
818 /gm, function(){...});
820 list_str = list_str.replace(/(\n)?(^[ \t]*)([*+-]|\d+[.])[ \t]+([^\r]+?(\n{1,2}))(?=\n*(~0|\2([*+-]|\d+[.])[ \t]+))/gm,
821 function(wholeMatch,m1,m2,m3,m4){
823 var leading_line = m1;
824 var leading_space = m2;
826 if (leading_line || (item.search(/\n{2,}/)>-1)) {
827 item = _RunBlockGamut(_Outdent(item));
830 // Recursion for sub-lists:
831 item = _DoLists(_Outdent(item));
832 item = item.replace(/\n$/,""); // chomp(item)
833 item = _RunSpanGamut(item);
836 return "<li>" + item + "</li>\n";
840 // attacklab: strip sentinel
841 list_str = list_str.replace(/~0/g,"");
848 var _DoCodeBlocks = function(text) {
850 // Process Markdown `<pre><code>` blocks.
854 text = text.replace(text,
856 ( // $1 = the code block -- one or more lines, starting with a space/tab
858 (?:[ ]{4}|\t) // Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
862 (\n*[ ]{0,3}[^ \t\n]|(?=~0)) // attacklab: g_tab_width
866 // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
869 text = text.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
870 function(wholeMatch,m1,m2) {
874 codeblock = _EncodeCode( _Outdent(codeblock));
875 codeblock = _Detab(codeblock);
876 codeblock = codeblock.replace(/^\n+/g,""); // trim leading newlines
877 codeblock = codeblock.replace(/\n+$/g,""); // trim trailing whitespace
879 codeblock = "<pre><code>" + codeblock + "\n</code></pre>";
881 return hashBlock(codeblock) + nextChar;
885 // attacklab: strip sentinel
886 text = text.replace(/~0/,"");
891 var hashBlock = function(text) {
892 text = text.replace(/(^\n+|\n+$)/g,"");
893 return "\n\n~K" + (g_html_blocks.push(text)-1) + "K\n\n";
897 var _DoCodeSpans = function(text) {
899 // * Backtick quotes are used for <code></code> spans.
901 // * You can use multiple backticks as the delimiters if you want to
902 // include literal backticks in the code span. So, this input:
904 // Just type ``foo `bar` baz`` at the prompt.
906 // Will translate to:
908 // <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
910 // There's no arbitrary limit to the number of backticks you
911 // can use as delimters. If you need three consecutive backticks
912 // in your code, use four for delimiters, etc.
914 // * You can use spaces to get literal backticks at the edges:
916 // ... type `` `bar` `` ...
920 // ... type <code>`bar`</code> ...
924 text = text.replace(/
925 (^|[^\\]) // Character before opening ` can't be a backslash
926 (`+) // $2 = Opening run of `
927 ( // $3 = The code block
929 [^`] // attacklab: work around lack of lookbehind
931 \2 // Matching closer
933 /gm, function(){...});
936 text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
937 function(wholeMatch,m1,m2,m3,m4) {
939 c = c.replace(/^([ \t]*)/g,""); // leading whitespace
940 c = c.replace(/[ \t]*$/g,""); // trailing whitespace
942 return m1+"<code>"+c+"</code>";
949 var _EncodeCode = function(text) {
951 // Encode/escape certain characters inside Markdown code runs.
952 // The point is that in code, these characters are literals,
953 // and lose their special Markdown meanings.
955 // Encode all ampersands; HTML entities are not
956 // entities within a Markdown code span.
957 text = text.replace(/&/g,"&");
959 // Do the angle bracket song and dance:
960 text = text.replace(/</g,"<");
961 text = text.replace(/>/g,">");
963 // Now, escape characters that are magic in Markdown:
964 text = escapeCharacters(text,"\*_{}[]\\",false);
966 // jj the line above breaks this:
980 var _DoItalicsAndBold = function(text) {
982 // <strong> must go first:
983 text = text.replace(/(\*\*|__)(?=\S)([^\r]*?\S[*_]*)\1/g,
984 "<strong>$2</strong>");
986 text = text.replace(/(\*|_)(?=\S)([^\r]*?\S)\1/g,
993 var _DoBlockQuotes = function(text) {
996 text = text.replace(/
997 ( // Wrap whole match in $1
999 ^[ \t]*>[ \t]? // '>' at the start of a line
1000 .+\n // rest of the first line
1001 (.+\n)* // subsequent consecutive lines
1005 /gm, function(){...});
1008 text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
1009 function(wholeMatch,m1) {
1012 // attacklab: hack around Konqueror 3.5.4 bug:
1013 // "----------bug".replace(/^-/g,"") == "bug"
1015 bq = bq.replace(/^[ \t]*>[ \t]?/gm,"~0"); // trim one level of quoting
1017 // attacklab: clean up hack
1018 bq = bq.replace(/~0/g,"");
1020 bq = bq.replace(/^[ \t]+$/gm,""); // trim whitespace-only lines
1021 bq = _RunBlockGamut(bq); // recurse
1023 bq = bq.replace(/(^|\n)/g,"$1 ");
1024 // These leading spaces screw with <pre> content, so we need to fix that:
1026 /(\s*<pre>[^\r]+?<\/pre>)/gm,
1027 function(wholeMatch,m1) {
1029 // attacklab: hack around Konqueror 3.5.4 bug:
1030 pre = pre.replace(/^ /mg,"~0");
1031 pre = pre.replace(/~0/g,"");
1035 return hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
1041 var _FormParagraphs = function(text) {
1044 // $text - string to process with html <p> tags
1047 // Strip leading and trailing lines:
1048 text = text.replace(/^\n+/g,"");
1049 text = text.replace(/\n+$/g,"");
1051 var grafs = text.split(/\n{2,}/g);
1052 var grafsOut = new Array();
1057 var end = grafs.length;
1058 for (var i=0; i<end; i++) {
1061 // if this is an HTML marker, copy it
1062 if (str.search(/~K(\d+)K/g) >= 0) {
1065 else if (str.search(/\S/) >= 0) {
1066 str = _RunSpanGamut(str);
1067 str = str.replace(/^([ \t]*)/g,"<p>");
1075 // Unhashify HTML blocks
1077 end = grafsOut.length;
1078 for (var i=0; i<end; i++) {
1079 // if this is a marker for an html block...
1080 while (grafsOut[i].search(/~K(\d+)K/) >= 0) {
1081 var blockText = g_html_blocks[RegExp.$1];
1082 blockText = blockText.replace(/\$/g,"$$$$"); // Escape any dollar signs
1083 grafsOut[i] = grafsOut[i].replace(/~K\d+K/,blockText);
1087 return grafsOut.join("\n\n");
1091 var _EncodeAmpsAndAngles = function(text) {
1092 // Smart processing for ampersands and angle brackets that need to be encoded.
1094 // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
1095 // http://bumppo.net/projects/amputator/
1096 text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g,"&");
1099 text = text.replace(/<(?![a-z\/?\$!])/gi,"<");
1105 var _EncodeBackslashEscapes = function(text) {
1107 // Parameter: String.
1108 // Returns: The string, with after processing the following backslash
1109 // escape sequences.
1112 // attacklab: The polite way to do this is with the new
1113 // escapeCharacters() function:
1115 // text = escapeCharacters(text,"\\",true);
1116 // text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
1118 // ...but we're sidestepping its use of the (slow) RegExp constructor
1119 // as an optimization for Firefox. This function gets called a LOT.
1121 text = text.replace(/\\(\\)/g,escapeCharacters_callback);
1122 text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g,escapeCharacters_callback);
1127 var _DoAutoLinks = function(text) {
1129 text = text.replace(/<((https?|ftp|dict):[^'">\s]+)>/gi,"<a href=\"$1\">$1</a>");
1131 // Email addresses: <address@domain.foo>
1134 text = text.replace(/
1140 [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
1143 /gi, _DoAutoLinks_callback());
1145 text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
1146 function(wholeMatch,m1) {
1147 return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
1155 var _EncodeEmailAddress = function(addr) {
1157 // Input: an email address, e.g. "foo@example.com"
1159 // Output: the email address as a mailto link, with each character
1160 // of the address encoded as either a decimal or hex entity, in
1161 // the hopes of foiling most address harvesting spam bots. E.g.:
1163 // <a href="mailto:foo@e
1164 // xample.com">foo
1165 // @example.com</a>
1167 // Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
1168 // mailing list: <http://tinyurl.com/yu7ue>
1171 // attacklab: why can't javascript speak hex?
1172 function char2hex(ch) {
1173 var hexDigits = '0123456789ABCDEF';
1174 var dec = ch.charCodeAt(0);
1175 return(hexDigits.charAt(dec>>4) + hexDigits.charAt(dec&15));
1179 function(ch){return "&#"+ch.charCodeAt(0)+";";},
1180 function(ch){return "&#x"+char2hex(ch)+";";},
1181 function(ch){return ch;}
1184 addr = "mailto:" + addr;
1186 addr = addr.replace(/./g, function(ch) {
1188 // this *must* be encoded. I insist.
1189 ch = encode[Math.floor(Math.random()*2)](ch);
1190 } else if (ch !=":") {
1191 // leave ':' alone (to spot mailto: later)
1192 var r = Math.random();
1193 // roughly 10% raw, 45% hex, 45% dec
1195 r > .9 ? encode[2](ch) :
1196 r > .45 ? encode[1](ch) :
1203 addr = "<a href=\"" + addr + "\">" + addr + "</a>";
1204 addr = addr.replace(/">.+:/g,"\">"); // strip the mailto: from the visible part
1210 var _UnescapeSpecialChars = function(text) {
1212 // Swap back in all the special characters we've hidden.
1214 text = text.replace(/~E(\d+)E/g,
1215 function(wholeMatch,m1) {
1216 var charCodeToReplace = parseInt(m1);
1217 return String.fromCharCode(charCodeToReplace);
1224 var _Outdent = function(text) {
1226 // Remove one level of line-leading tabs or spaces
1229 // attacklab: hack around Konqueror 3.5.4 bug:
1230 // "----------bug".replace(/^-/g,"") == "bug"
1232 text = text.replace(/^(\t|[ ]{1,4})/gm,"~0"); // attacklab: g_tab_width
1234 // attacklab: clean up hack
1235 text = text.replace(/~0/g,"")
1240 var _Detab = function(text) {
1241 // attacklab: Detab's completely rewritten for speed.
1242 // In perl we could fix it by anchoring the regexp with \G.
1243 // In javascript we're less fortunate.
1245 // expand first n-1 tabs
1246 text = text.replace(/\t(?=\t)/g," "); // attacklab: g_tab_width
1248 // replace the nth with two sentinels
1249 text = text.replace(/\t/g,"~A~B");
1251 // use the sentinel to anchor our regex so it doesn't explode
1252 text = text.replace(/~B(.+?)~A/g,
1253 function(wholeMatch,m1,m2) {
1254 var leadingText = m1;
1255 var numSpaces = 4 - leadingText.length % 4; // attacklab: g_tab_width
1257 // there *must* be a better way to do this:
1258 for (var i=0; i<numSpaces; i++) leadingText+=" ";
1264 // clean up sentinels
1265 text = text.replace(/~A/g," "); // attacklab: g_tab_width
1266 text = text.replace(/~B/g,"");
1273 // attacklab: Utility functions
1277 var escapeCharacters = function(text, charsToEscape, afterBackslash) {
1278 // First we have to escape the escape characters so that
1279 // we can build a character class out of them
1280 var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g,"\\$1") + "])";
1282 if (afterBackslash) {
1283 regexString = "\\\\" + regexString;
1286 var regex = new RegExp(regexString,"g");
1287 text = text.replace(regex,escapeCharacters_callback);
1293 var escapeCharacters_callback = function(wholeMatch,m1) {
1294 var charCodeToEscape = m1.charCodeAt(0);
1295 return "~E"+charCodeToEscape+"E";
1298 } // end of Showdown.converter
1301 //if (typeof exports != 'undefined') exports.Showdown = Showdown;