From 64c97ef612f5b65c155de38300fc3e1082ff1199 Mon Sep 17 00:00:00 2001 From: Scott Vivian Date: Thu, 15 Mar 2012 14:30:21 +0000 Subject: [PATCH] Markdown version 2: switched to PageDown and other fixes --- inc.markdown.php | 1600 +++++++++++++++++++++++ pagedown/Markdown.Converter.js | 1335 ++++++++++++++++++++ pagedown/Markdown.Editor.js | 2170 ++++++++++++++++++++++++++++++++ pagedown/Markdown.Sanitizer.js | 108 ++ pagedown/markdown.min.js | 64 + pagedown/sample.css | 94 ++ pagedown/wmd-buttons.png | Bin 0 -> 2697 bytes qa-markdown-editor.php | 62 + qa-markdown-viewer.php | 42 + qa-plugin.php | 34 + 10 files changed, 5509 insertions(+) create mode 100644 inc.markdown.php create mode 100644 pagedown/Markdown.Converter.js create mode 100644 pagedown/Markdown.Editor.js create mode 100644 pagedown/Markdown.Sanitizer.js create mode 100644 pagedown/markdown.min.js create mode 100644 pagedown/sample.css create mode 100644 pagedown/wmd-buttons.png create mode 100644 qa-markdown-editor.php create mode 100644 qa-markdown-viewer.php create mode 100644 qa-plugin.php diff --git a/inc.markdown.php b/inc.markdown.php new file mode 100644 index 0000000..a996b43 --- /dev/null +++ b/inc.markdown.php @@ -0,0 +1,1600 @@ + +# +# Original Markdown +# Copyright (c) 2004-2006 John Gruber +# +# + + +define( 'MARKDOWN_VERSION', '1.0.1n' ); # Sat 10 Oct 2009 + + +# +# Global default settings: +# + +# Change to ">" for HTML output +@define( 'MARKDOWN_EMPTY_ELEMENT_SUFFIX', '>'); + +# Define the width of a tab for code blocks. +@define( 'MARKDOWN_TAB_WIDTH', 4 ); + + + +### Standard Function Interface ### + +@define( 'MARKDOWN_PARSER_CLASS', 'Markdown_Parser' ); + +function Markdown($text) { +# +# Initialize the parser and return the result of its transform method. +# + # Setup static parser variable. + static $parser; + if (!isset($parser)) { + $parser_class = MARKDOWN_PARSER_CLASS; + $parser = new $parser_class; + } + + # Transform text using parser. + return $parser->transform($text); +} + + +# +# Markdown Parser Class +# + +class Markdown_Parser { + + # Regex to match balanced [brackets]. + # Needed to insert a maximum bracked depth while converting to PHP. + var $nested_brackets_depth = 6; + var $nested_brackets_re; + + var $nested_url_parenthesis_depth = 4; + var $nested_url_parenthesis_re; + + # Table of hash values for escaped characters: + var $escape_chars = '\`*_{}[]()>#+-.!'; + var $escape_chars_re; + + # Change to ">" for HTML output. + var $empty_element_suffix = MARKDOWN_EMPTY_ELEMENT_SUFFIX; + var $tab_width = MARKDOWN_TAB_WIDTH; + + # Change to `true` to disallow markup or entities. + var $no_markup = false; + var $no_entities = false; + + # Predefined urls and titles for reference links and images. + var $predef_urls = array(); + var $predef_titles = array(); + + + function Markdown_Parser() { + # + # Constructor function. Initialize appropriate member variables. + # + $this->_initDetab(); + $this->prepareItalicsAndBold(); + + $this->nested_brackets_re = + str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth). + str_repeat('\])*', $this->nested_brackets_depth); + + $this->nested_url_parenthesis_re = + str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth). + str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth); + + $this->escape_chars_re = '['.preg_quote($this->escape_chars).']'; + + # Sort document, block, and span gamut in ascendent priority order. + asort($this->document_gamut); + asort($this->block_gamut); + asort($this->span_gamut); + } + + + # Internal hashes used during transformation. + var $urls = array(); + var $titles = array(); + var $html_hashes = array(); + + # Status flag to avoid invalid nesting. + var $in_anchor = false; + + + function setup() { + # + # Called before the transformation process starts to setup parser + # states. + # + # Clear global hashes. + $this->urls = $this->predef_urls; + $this->titles = $this->predef_titles; + $this->html_hashes = array(); + + $in_anchor = false; + } + + function teardown() { + # + # Called after the transformation process to clear any variable + # which may be taking up memory unnecessarly. + # + $this->urls = array(); + $this->titles = array(); + $this->html_hashes = array(); + } + + + function transform($text) { + # + # Main function. Performs some preprocessing on the input text + # and pass it through the document gamut. + # + $this->setup(); + + # Remove UTF-8 BOM and marker character in input, if present. + $text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text); + + # Standardize line endings: + # DOS to Unix and Mac to Unix + $text = preg_replace('{\r\n?}', "\n", $text); + + # Make sure $text ends with a couple of newlines: + $text .= "\n\n"; + + # Convert all tabs to spaces. + $text = $this->detab($text); + + # Turn block-level HTML blocks into hash entries + $text = $this->hashHTMLBlocks($text); + + # Strip any lines consisting only of spaces and tabs. + # This makes subsequent regexen easier to write, because we can + # match consecutive blank lines with /\n+/ instead of something + # contorted like /[ ]*\n+/ . + $text = preg_replace('/^[ ]+$/m', '', $text); + + # Run document gamut methods. + foreach ($this->document_gamut as $method => $priority) { + $text = $this->$method($text); + } + + $this->teardown(); + + return $text . "\n"; + } + + var $document_gamut = array( + # Strip link definitions, store in hashes. + "stripLinkDefinitions" => 20, + + "runBasicBlockGamut" => 30, + ); + + + function stripLinkDefinitions($text) { + # + # Strips link definitions from text, stores the URLs and titles in + # hash references. + # + $less_than_tab = $this->tab_width - 1; + + # Link defs are in the form: ^[id]: url "optional title" + $text = preg_replace_callback('{ + ^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1 + [ ]* + \n? # maybe *one* newline + [ ]* + (?: + <(.+?)> # url = $2 + | + (\S+?) # url = $3 + ) + [ ]* + \n? # maybe one newline + [ ]* + (?: + (?<=\s) # lookbehind for whitespace + ["(] + (.*?) # title = $4 + [")] + [ ]* + )? # title is optional + (?:\n+|\Z) + }xm', + array(&$this, '_stripLinkDefinitions_callback'), + $text); + return $text; + } + function _stripLinkDefinitions_callback($matches) { + $link_id = strtolower($matches[1]); + $url = $matches[2] == '' ? $matches[3] : $matches[2]; + $this->urls[$link_id] = $url; + $this->titles[$link_id] =& $matches[4]; + return ''; # String that will replace the block + } + + + function hashHTMLBlocks($text) { + if ($this->no_markup) return $text; + + $less_than_tab = $this->tab_width - 1; + + # Hashify HTML blocks: + # We only want to do this for block-level HTML tags, such as headers, + # lists, and tables. That's because we still want to wrap

s around + # "paragraphs" that are wrapped in non-block-level tags, such as anchors, + # phrase emphasis, and spans. The list of tags we're looking for is + # hard-coded: + # + # * List "a" is made of tags which can be both inline or block-level. + # These will be treated block-level when the start tag is alone on + # its line, otherwise they're not matched here and will be taken as + # inline later. + # * List "b" is made of tags which are always block-level; + # + $block_tags_a_re = 'ins|del'; + $block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'. + 'script|noscript|form|fieldset|iframe|math'; + + # Regular expression for the content of a block tag. + $nested_tags_level = 4; + $attr = ' + (?> # optional tag attributes + \s # starts with whitespace + (?> + [^>"/]+ # text outside quotes + | + /+(?!>) # slash not followed by ">" + | + "[^"]*" # text inside double quotes (tolerate ">") + | + \'[^\']*\' # text inside single quotes (tolerate ">") + )* + )? + '; + $content = + str_repeat(' + (?> + [^<]+ # content without tag + | + <\2 # nested opening tag + '.$attr.' # attributes + (?> + /> + | + >', $nested_tags_level). # end of opening tag + '.*?'. # last level nested tag content + str_repeat(' + # closing nested tag + ) + | + <(?!/\2\s*> # other tags with a different name + ) + )*', + $nested_tags_level); + $content2 = str_replace('\2', '\3', $content); + + # First, look for nested blocks, e.g.: + #

+ #
+ # tags for inner block must be indented. + #
+ #
+ # + # The outermost tags must start at the left margin for this to match, and + # the inner nested divs must be indented. + # We need to do this before the next, more liberal match, because the next + # match will start at the first `
` and stop at the first `
`. + $text = preg_replace_callback('{(?> + (?> + (?<=\n\n) # Starting after a blank line + | # or + \A\n? # the beginning of the doc + ) + ( # save in $1 + + # Match from `\n` to `\n`, handling nested tags + # in between. + + [ ]{0,'.$less_than_tab.'} + <('.$block_tags_b_re.')# start tag = $2 + '.$attr.'> # attributes followed by > and \n + '.$content.' # content, support nesting + # the matching end tag + [ ]* # trailing spaces/tabs + (?=\n+|\Z) # followed by a newline or end of document + + | # Special version for tags of group a. + + [ ]{0,'.$less_than_tab.'} + <('.$block_tags_a_re.')# start tag = $3 + '.$attr.'>[ ]*\n # attributes followed by > + '.$content2.' # content, support nesting + # the matching end tag + [ ]* # trailing spaces/tabs + (?=\n+|\Z) # followed by a newline or end of document + + | # Special case just for
. It was easier to make a special + # case than to make the other regex more complicated. + + [ ]{0,'.$less_than_tab.'} + <(hr) # start tag = $2 + '.$attr.' # attributes + /?> # the matching end tag + [ ]* + (?=\n{2,}|\Z) # followed by a blank line or end of document + + | # Special case for standalone HTML comments: + + [ ]{0,'.$less_than_tab.'} + (?s: + + ) + [ ]* + (?=\n{2,}|\Z) # followed by a blank line or end of document + + | # PHP and ASP-style processor instructions ( + ) + [ ]* + (?=\n{2,}|\Z) # followed by a blank line or end of document + + ) + )}Sxmi', + array(&$this, '_hashHTMLBlocks_callback'), + $text); + + return $text; + } + function _hashHTMLBlocks_callback($matches) { + $text = $matches[1]; + $key = $this->hashBlock($text); + return "\n\n$key\n\n"; + } + + + function hashPart($text, $boundary = 'X') { + # + # Called whenever a tag must be hashed when a function insert an atomic + # element in the text stream. Passing $text to through this function gives + # a unique text-token which will be reverted back when calling unhash. + # + # The $boundary argument specify what character should be used to surround + # the token. By convension, "B" is used for block elements that needs not + # to be wrapped into paragraph tags at the end, ":" is used for elements + # that are word separators and "X" is used in the general case. + # + # Swap back any tag hash found in $text so we do not have to `unhash` + # multiple times at the end. + $text = $this->unhash($text); + + # Then hash the block. + static $i = 0; + $key = "$boundary\x1A" . ++$i . $boundary; + $this->html_hashes[$key] = $text; + return $key; # String that will replace the tag. + } + + + function hashBlock($text) { + # + # Shortcut function for hashPart with block-level boundaries. + # + return $this->hashPart($text, 'B'); + } + + + var $block_gamut = array( + # + # These are all the transformations that form block-level + # tags like paragraphs, headers, and list items. + # + "doHeaders" => 10, + "doHorizontalRules" => 20, + + "doLists" => 40, + "doCodeBlocks" => 50, + "doBlockQuotes" => 60, + ); + + function runBlockGamut($text) { + # + # Run block gamut tranformations. + # + # We need to escape raw HTML in Markdown source before doing anything + # else. This need to be done for each block, and not only at the + # begining in the Markdown function since hashed blocks can be part of + # list items and could have been indented. Indented blocks would have + # been seen as a code block in a previous pass of hashHTMLBlocks. + $text = $this->hashHTMLBlocks($text); + + return $this->runBasicBlockGamut($text); + } + + function runBasicBlockGamut($text) { + # + # Run block gamut tranformations, without hashing HTML blocks. This is + # useful when HTML blocks are known to be already hashed, like in the first + # whole-document pass. + # + foreach ($this->block_gamut as $method => $priority) { + $text = $this->$method($text); + } + + # Finally form paragraph and restore hashed blocks. + $text = $this->formParagraphs($text); + + return $text; + } + + + function doHorizontalRules($text) { + # Do Horizontal Rules: + return preg_replace( + '{ + ^[ ]{0,3} # Leading space + ([-*_]) # $1: First marker + (?> # Repeated marker group + [ ]{0,2} # Zero, one, or two spaces. + \1 # Marker character + ){2,} # Group repeated at least twice + [ ]* # Tailing spaces + $ # End of line. + }mx', + "\n".$this->hashBlock("empty_element_suffix")."\n", + $text); + } + + + var $span_gamut = array( + # + # These are all the transformations that occur *within* block-level + # tags like paragraphs, headers, and list items. + # + # Process character escapes, code spans, and inline HTML + # in one shot. + "parseSpan" => -30, + + # Process anchor and image tags. Images must come first, + # because ![foo][f] looks like an anchor. + "doImages" => 10, + "doAnchors" => 20, + + # Make links out of things like `` + # Must come after doAnchors, because you can use < and > + # delimiters in inline links like [this](). + "doAutoLinks" => 30, + "encodeAmpsAndAngles" => 40, + + "doItalicsAndBold" => 50, + "doHardBreaks" => 60, + ); + + function runSpanGamut($text) { + # + # Run span gamut tranformations. + # + foreach ($this->span_gamut as $method => $priority) { + $text = $this->$method($text); + } + + return $text; + } + + + function doHardBreaks($text) { + # Do hard breaks: + /** SV: don't need trailing spaces for line breaks */ + return preg_replace_callback('/\n/', + array(&$this, '_doHardBreaks_callback'), $text); + } + function _doHardBreaks_callback($matches) { + return $this->hashPart("empty_element_suffix\n"); + } + + + function doAnchors($text) { + # + # Turn Markdown link shortcuts into XHTML tags. + # + if ($this->in_anchor) return $text; + $this->in_anchor = true; + + # + # First, handle reference-style links: [link text] [id] + # + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + \[ + ('.$this->nested_brackets_re.') # link text = $2 + \] + + [ ]? # one optional space + (?:\n[ ]*)? # one optional newline followed by spaces + + \[ + (.*?) # id = $3 + \] + ) + }xs', + array(&$this, '_doAnchors_reference_callback'), $text); + + # + # Next, inline-style links: [link text](url "optional title") + # + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + \[ + ('.$this->nested_brackets_re.') # link text = $2 + \] + \( # literal paren + [ \n]* + (?: + <(.+?)> # href = $3 + | + ('.$this->nested_url_parenthesis_re.') # href = $4 + ) + [ \n]* + ( # $5 + ([\'"]) # quote char = $6 + (.*?) # Title = $7 + \6 # matching quote + [ \n]* # ignore any spaces/tabs between closing quote and ) + )? # title is optional + \) + ) + }xs', + array(&$this, '_doAnchors_inline_callback'), $text); + + # + # Last, handle reference-style shortcuts: [link text] + # These must come last in case you've also got [link text][1] + # or [link text](/foo) + # + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + \[ + ([^\[\]]+) # link text = $2; can\'t contain [ or ] + \] + ) + }xs', + array(&$this, '_doAnchors_reference_callback'), $text); + + $this->in_anchor = false; + return $text; + } + function _doAnchors_reference_callback($matches) { + $whole_match = $matches[1]; + $link_text = $matches[2]; + $link_id =& $matches[3]; + + if ($link_id == "") { + # for shortcut links like [this][] or [this]. + $link_id = $link_text; + } + + # lower-case and turn embedded newlines into spaces + $link_id = strtolower($link_id); + $link_id = preg_replace('{[ ]?\n}', ' ', $link_id); + + if (isset($this->urls[$link_id])) { + $url = $this->urls[$link_id]; + $url = $this->encodeAttribute($url); + + $result = "titles[$link_id] ) ) { + $title = $this->titles[$link_id]; + $title = $this->encodeAttribute($title); + $result .= " title=\"$title\""; + } + + $link_text = $this->runSpanGamut($link_text); + $result .= ">$link_text"; + $result = $this->hashPart($result); + } + else { + $result = $whole_match; + } + return $result; + } + function _doAnchors_inline_callback($matches) { + $whole_match = $matches[1]; + $link_text = $this->runSpanGamut($matches[2]); + $url = $matches[3] == '' ? $matches[4] : $matches[3]; + $title =& $matches[7]; + + $url = $this->encodeAttribute($url); + + $result = "encodeAttribute($title); + $result .= " title=\"$title\""; + } + + $link_text = $this->runSpanGamut($link_text); + $result .= ">$link_text"; + + return $this->hashPart($result); + } + + + function doImages($text) { + # + # Turn Markdown image shortcuts into tags. + # + # + # First, handle reference-style labeled images: ![alt text][id] + # + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + !\[ + ('.$this->nested_brackets_re.') # alt text = $2 + \] + + [ ]? # one optional space + (?:\n[ ]*)? # one optional newline followed by spaces + + \[ + (.*?) # id = $3 + \] + + ) + }xs', + array(&$this, '_doImages_reference_callback'), $text); + + # + # Next, handle inline images: ![alt text](url "optional title") + # Don't forget: encode * and _ + # + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + !\[ + ('.$this->nested_brackets_re.') # alt text = $2 + \] + \s? # One optional whitespace character + \( # literal paren + [ \n]* + (?: + <(\S*)> # src url = $3 + | + ('.$this->nested_url_parenthesis_re.') # src url = $4 + ) + [ \n]* + ( # $5 + ([\'"]) # quote char = $6 + (.*?) # title = $7 + \6 # matching quote + [ \n]* + )? # title is optional + \) + ) + }xs', + array(&$this, '_doImages_inline_callback'), $text); + + return $text; + } + function _doImages_reference_callback($matches) { + $whole_match = $matches[1]; + $alt_text = $matches[2]; + $link_id = strtolower($matches[3]); + + if ($link_id == "") { + $link_id = strtolower($alt_text); # for shortcut links like ![this][]. + } + + $alt_text = $this->encodeAttribute($alt_text); + if (isset($this->urls[$link_id])) { + $url = $this->encodeAttribute($this->urls[$link_id]); + $result = "\"$alt_text\"";titles[$link_id])) { + $title = $this->titles[$link_id]; + $title = $this->encodeAttribute($title); + $result .= " title=\"$title\""; + } + $result .= $this->empty_element_suffix; + $result = $this->hashPart($result); + } + else { + # If there's no such link ID, leave intact: + $result = $whole_match; + } + + return $result; + } + function _doImages_inline_callback($matches) { + $whole_match = $matches[1]; + $alt_text = $matches[2]; + $url = $matches[3] == '' ? $matches[4] : $matches[3]; + $title =& $matches[7]; + + $alt_text = $this->encodeAttribute($alt_text); + $url = $this->encodeAttribute($url); + $result = "\"$alt_text\"";encodeAttribute($title); + $result .= " title=\"$title\""; # $title already quoted + } + $result .= $this->empty_element_suffix; + + return $this->hashPart($result); + } + + + function doHeaders($text) { + # Setext-style headers: + # Header 1 + # ======== + # + # Header 2 + # -------- + # + $text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx', + array(&$this, '_doHeaders_callback_setext'), $text); + + # atx-style headers: + # # Header 1 + # ## Header 2 + # ## Header 2 with closing hashes ## + # ... + # ###### Header 6 + # + /** SV: limit headers to H2..6 */ + $text = preg_replace_callback('{ + ^(\#{1,5}) # $1 = string of #\'s + [ ]* + (.+?) # $2 = Header text + [ ]* + \#* # optional closing #\'s (not counted) + \n+ + }xm', + array(&$this, '_doHeaders_callback_atx'), $text); + + return $text; + } + function _doHeaders_callback_setext($matches) { + # Terrible hack to check we haven't found an empty list item. + if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1])) + return $matches[0]; + + $level = $matches[2]{0} == '=' ? 2 : 3; + $block = "".$this->runSpanGamut($matches[1]).""; + return "\n" . $this->hashBlock($block) . "\n\n"; + } + function _doHeaders_callback_atx($matches) { + /** SV: limit headers to H2..6 */ + $level = strlen($matches[1]) + 1; + $block = "".$this->runSpanGamut($matches[2]).""; + return "\n" . $this->hashBlock($block) . "\n\n"; + } + + + function doLists($text) { + # + # Form HTML ordered (numbered) and unordered (bulleted) lists. + # + $less_than_tab = $this->tab_width - 1; + + # Re-usable patterns to match list item bullets and number markers: + $marker_ul_re = '[*+-]'; + $marker_ol_re = '\d+[.]'; + $marker_any_re = "(?:$marker_ul_re|$marker_ol_re)"; + + $markers_relist = array( + $marker_ul_re => $marker_ol_re, + $marker_ol_re => $marker_ul_re, + ); + + foreach ($markers_relist as $marker_re => $other_marker_re) { + # Re-usable pattern to match any entirel ul or ol list: + $whole_list_re = ' + ( # $1 = whole list + ( # $2 + ([ ]{0,'.$less_than_tab.'}) # $3 = number of spaces + ('.$marker_re.') # $4 = first list item marker + [ ]+ + ) + (?s:.+?) + ( # $5 + \z + | + \n{2,} + (?=\S) + (?! # Negative lookahead for another list item marker + [ ]* + '.$marker_re.'[ ]+ + ) + | + (?= # Lookahead for another kind of list + \n + \3 # Must have the same indentation + '.$other_marker_re.'[ ]+ + ) + ) + ) + '; // mx + + # We use a different prefix before nested lists than top-level lists. + # See extended comment in _ProcessListItems(). + + if ($this->list_level) { + $text = preg_replace_callback('{ + ^ + '.$whole_list_re.' + }mx', + array(&$this, '_doLists_callback'), $text); + } + else { + $text = preg_replace_callback('{ + (?:(?<=\n)\n|\A\n?) # Must eat the newline + '.$whole_list_re.' + }mx', + array(&$this, '_doLists_callback'), $text); + } + } + + return $text; + } + function _doLists_callback($matches) { + # Re-usable patterns to match list item bullets and number markers: + $marker_ul_re = '[*+-]'; + $marker_ol_re = '\d+[.]'; + $marker_any_re = "(?:$marker_ul_re|$marker_ol_re)"; + + $list = $matches[1]; + $list_type = preg_match("/$marker_ul_re/", $matches[4]) ? "ul" : "ol"; + + $marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re ); + + $list .= "\n"; + $result = $this->processListItems($list, $marker_any_re); + + $result = $this->hashBlock("<$list_type>\n" . $result . ""); + return "\n". $result ."\n\n"; + } + + var $list_level = 0; + + function processListItems($list_str, $marker_any_re) { + # + # Process the contents of a single ordered or unordered list, splitting it + # into individual list items. + # + # The $this->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 + # something like this: + # + # I recommend upgrading to version + # 8. Oops, now this line is treated + # as a sub-list. + # + # 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.". + + $this->list_level++; + + # trim trailing blank lines: + $list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str); + + $list_str = preg_replace_callback('{ + (\n)? # leading line = $1 + (^[ ]*) # leading whitespace = $2 + ('.$marker_any_re.' # list marker and space = $3 + (?:[ ]+|(?=\n)) # space only required if item is not empty + ) + ((?s:.*?)) # list item text = $4 + (?:(\n+(?=\n))|\n) # tailing blank line = $5 + (?= \n* (\z | \2 ('.$marker_any_re.') (?:[ ]+|(?=\n)))) + }xm', + array(&$this, '_processListItems_callback'), $list_str); + + $this->list_level--; + return $list_str; + } + function _processListItems_callback($matches) { + $item = $matches[4]; + $leading_line =& $matches[1]; + $leading_space =& $matches[2]; + $marker_space = $matches[3]; + $tailing_blank_line =& $matches[5]; + + if ($leading_line || $tailing_blank_line || + preg_match('/\n{2,}/', $item)) + { + # Replace marker with the appropriate whitespace indentation + $item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item; + $item = $this->runBlockGamut($this->outdent($item)."\n"); + } + else { + # Recursion for sub-lists: + $item = $this->doLists($this->outdent($item)); + $item = preg_replace('/\n+$/', '', $item); + $item = $this->runSpanGamut($item); + } + + return "
  • " . $item . "
    • \n"; + } + + + function doCodeBlocks($text) { + # + # Process Markdown `
    ` blocks.
+	#
+		$text = preg_replace_callback('{
+				(?:\n\n|\A\n?)
+				(	            # $1 = the code block -- one or more lines, starting with a space/tab
+				  (?>
+					[ ]{'.$this->tab_width.'}  # Lines must start with a tab or a tab-width of spaces
+					.*\n+
+				  )+
+				)
+				((?=^[ ]{0,'.$this->tab_width.'}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
+			}xm',
+			array(&$this, '_doCodeBlocks_callback'), $text);
+
+		return $text;
+	}
+	function _doCodeBlocks_callback($matches) {
+		$codeblock = $matches[1];
+
+		$codeblock = $this->outdent($codeblock);
+		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+
+		# trim leading newlines and trailing newlines
+		$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
+
+		$codeblock = "
    $codeblock\n
    ";
+		return "\n\n".$this->hashBlock($codeblock)."\n\n";
+	}
+
+
+	function makeCodeSpan($code) {
+	#
+	# Create a code span markup for $code. Called from handleSpanToken.
+	#
+		$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
+		return $this->hashPart("$code");
+	}
+
+
+	var $em_relist = array(
+		''  => '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(?em_relist as $em => $em_re) {
+			foreach ($this->strong_relist as $strong => $strong_re) {
+				# Construct list of allowed token expressions.
+				$token_relist = array();
+				if (isset($this->em_strong_relist["$em$strong"])) {
+					$token_relist[] = $this->em_strong_relist["$em$strong"];
+				}
+				$token_relist[] = $em_re;
+				$token_relist[] = $strong_re;
+
+				# Construct master expression from list.
+				$token_re = '{('. implode('|', $token_relist) .')}';
+				$this->em_strong_prepared_relist["$em$strong"] = $token_re;
+			}
+		}
+	}
+
+	function doItalicsAndBold($text) {
+		$token_stack = array('');
+		$text_stack = array('');
+		$em = '';
+		$strong = '';
+		$tree_char_em = false;
+
+		while (1) {
+			#
+			# Get prepared regular expression for seraching emphasis tokens
+			# in current context.
+			#
+			$token_re = $this->em_strong_prepared_relist["$em$strong"];
+
+			#
+			# Each loop iteration search for the next emphasis token.
+			# Each token is then passed to handleSpanToken.
+			#
+			$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
+			$text_stack[0] .= $parts[0];
+			$token =& $parts[1];
+			$text =& $parts[2];
+
+			if (empty($token)) {
+				# Reached end of text span: empty stack without emitting.
+				# any more emphasis.
+				while ($token_stack[0]) {
+					$text_stack[1] .= array_shift($token_stack);
+					$text_stack[0] .= array_shift($text_stack);
+				}
+				break;
+			}
+
+			$token_len = strlen($token);
+			if ($tree_char_em) {
+				# Reached closing marker while inside a three-char emphasis.
+				if ($token_len == 3) {
+					# Three-char closing marker, close em and strong.
+					array_shift($token_stack);
+					$span = array_shift($text_stack);
+					$span = $this->runSpanGamut($span);
+					$span = "$span";
+					$text_stack[0] .= $this->hashPart($span);
+					$em = '';
+					$strong = '';
+				} else {
+					# Other closing marker: close one em or strong and
+					# change current token state to match the other
+					$token_stack[0] = str_repeat($token{0}, 3-$token_len);
+					$tag = $token_len == 2 ? "strong" : "em";
+					$span = $text_stack[0];
+					$span = $this->runSpanGamut($span);
+					$span = "<$tag>$span";
+					$text_stack[0] = $this->hashPart($span);
+					$$tag = ''; # $$tag stands for $em or $strong
+				}
+				$tree_char_em = false;
+			} else if ($token_len == 3) {
+				if ($em) {
+					# Reached closing marker for both em and strong.
+					# Closing strong marker:
+					for ($i = 0; $i < 2; ++$i) {
+						$shifted_token = array_shift($token_stack);
+						$tag = strlen($shifted_token) == 2 ? "strong" : "em";
+						$span = array_shift($text_stack);
+						$span = $this->runSpanGamut($span);
+						$span = "<$tag>$span";
+						$text_stack[0] .= $this->hashPart($span);
+						$$tag = ''; # $$tag stands for $em or $strong
+					}
+				} else {
+					# Reached opening three-char emphasis marker. Push on token
+					# stack; will be handled by the special condition above.
+					$em = $token{0};
+					$strong = "$em$em";
+					array_unshift($token_stack, $token);
+					array_unshift($text_stack, '');
+					$tree_char_em = true;
+				}
+			} else if ($token_len == 2) {
+				if ($strong) {
+					# Unwind any dangling emphasis marker:
+					if (strlen($token_stack[0]) == 1) {
+						$text_stack[1] .= array_shift($token_stack);
+						$text_stack[0] .= array_shift($text_stack);
+					}
+					# Closing strong marker:
+					array_shift($token_stack);
+					$span = array_shift($text_stack);
+					$span = $this->runSpanGamut($span);
+					$span = "$span";
+					$text_stack[0] .= $this->hashPart($span);
+					$strong = '';
+				} else {
+					array_unshift($token_stack, $token);
+					array_unshift($text_stack, '');
+					$strong = $token;
+				}
+			} else {
+				# Here $token_len == 1
+				if ($em) {
+					if (strlen($token_stack[0]) == 1) {
+						# Closing emphasis marker:
+						array_shift($token_stack);
+						$span = array_shift($text_stack);
+						$span = $this->runSpanGamut($span);
+						$span = "$span";
+						$text_stack[0] .= $this->hashPart($span);
+						$em = '';
+					} else {
+						$text_stack[0] .= $token;
+					}
+				} else {
+					array_unshift($token_stack, $token);
+					array_unshift($text_stack, '');
+					$em = $token;
+				}
+			}
+		}
+		return $text_stack[0];
+	}
+
+
+	function doBlockQuotes($text) {
+// 		var_dump(str_replace("\n", '\n', $text)); echo '
    ';
+		$text = preg_replace_callback('/
+			  (								# Wrap whole match in $1
+				(?>
+				  ^[ ]*>[ ]?				# ">" at the start of a line
+					.+\n					# rest of the first line
+				  (.+\n)*					# subsequent consecutive lines
+				  \n*						# blanks
+				)+
+			  )
+			/xm',
+			array(&$this, '_doBlockQuotes_callback'), $text);
+
+		return $text;
+	}
+	function _doBlockQuotes_callback($matches) {
+		$bq = $matches[1];
+		# trim one level of quoting - trim whitespace-only lines
+		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
+		$bq = $this->runBlockGamut($bq);		# recurse
+
+		$bq = preg_replace('/^/m', "  ", $bq);
+		# These leading spaces cause problem with 
     content,
+		# so we need to fix that:
+		$bq = preg_replace_callback('{(\s*
    .+?
    )}sx',
+			array(&$this, '_doBlockQuotes_callback2'), $bq);
+
+		return "\n". $this->hashBlock("
    \n$bq\n
    ")."\n\n";
+	}
+	function _doBlockQuotes_callback2($matches) {
+		$pre = $matches[1];
+		$pre = preg_replace('/^  /m', '', $pre);
+		return $pre;
+	}
+
+
+	function formParagraphs($text) {
+	#
+	#	Params:
+	#		$text - string to process with html 
     tags
+	#
+		# Strip leading and trailing lines:
+		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+		#
+		# Wrap 
     tags and unhashify HTML blocks
+		#
+		foreach ($grafs as $key => $value) {
+			if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
+				# Is a paragraph.
+				$value = $this->runSpanGamut($value);
+				$value = preg_replace('/^([ ]*)/', "
    ", $value);
+				$value .= "
    ";
+				$grafs[$key] = $this->unhash($value);
+			}
+			else {
+				# Is a block.
+				# Modify elements of @grafs in-place...
+				$graf = $value;
+				$block = $this->html_hashes[$graf];
+				$graf = $block;
+//				if (preg_match('{
+//					\A
+//					(							# $1 = 
     tag
+//					  
    ]*
+//					  \b
+//					  markdown\s*=\s*  ([\'"])	#	$2 = attr quote char
+//					  1
+//					  \2
+//					  [^>]*
+//					  >
+//					)
+//					(							# $3 = contents
+//					.*
+//					)
+//					(
    )					# $4 = closing tag
+//					\z
+//					}xs', $block, $matches))
+//				{
+//					list(, $div_open, , $div_content, $div_close) = $matches;
+//
+//					# We can't call Markdown(), because that resets the hash;
+//					# that initialization code should be pulled into its own sub, though.
+//					$div_content = $this->hashHTMLBlocks($div_content);
+//
+//					# Run document gamut methods on the content.
+//					foreach ($this->document_gamut as $method => $priority) {
+//						$div_content = $this->$method($div_content);
+//					}
+//
+//					$div_open = preg_replace(
+//						'{\smarkdown\s*=\s*([\'"]).+?\1}', '', $div_open);
+//
+//					$graf = $div_open . "\n" . $div_content . "\n" . $div_close;
+//				}
+				$grafs[$key] = $graf;
+			}
+		}
+
+		return implode("\n\n", $grafs);
+	}
+
+
+	function encodeAttribute($text) {
+	#
+	# Encode text for a double-quoted HTML attribute. This function
+	# is *not* suitable for attributes enclosed in single quotes.
+	#
+		$text = $this->encodeAmpsAndAngles($text);
+		$text = str_replace('"', '"', $text);
+		return $text;
+	}
+
+
+	function encodeAmpsAndAngles($text) {
+	#
+	# Smart processing for ampersands and angle brackets that need to
+	# be encoded. Valid character entities are left alone unless the
+	# no-entities mode is set.
+	#
+		if ($this->no_entities) {
+			$text = str_replace('&', '&', $text);
+		} else {
+			# Ampersand-encoding based entirely on Nat Irons's Amputator
+			# MT plugin: 
+			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/',
+								'&', $text);;
+		}
+		# Encode remaining <'s
+		$text = str_replace('<', '<', $text);
+
+		return $text;
+	}
+
+
+	function doAutoLinks($text) {
+		/** SV: brackets optional for links */
+		$text = preg_replace_callback('{\s]+)>?}i',
+			array(&$this, '_doAutoLinks_url_callback'), $text);
+
+		# Email addresses: 
+		$text = preg_replace_callback('{
+			<
+			(?:mailto:)?
+			(
+				(?:
+					[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
+				|
+					".*?"
+				)
+				\@
+				(?:
+					[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
+				|
+					\[[\d.a-fA-F:]+\]	# IPv4 & IPv6
+				)
+			)
+			>
+			}xi',
+			array(&$this, '_doAutoLinks_email_callback'), $text);
+
+		return $text;
+	}
+	function _doAutoLinks_url_callback($matches) {
+		$url = $this->encodeAttribute($matches[1]);
+		$link = "$url";
+		return $this->hashPart($link);
+	}
+	function _doAutoLinks_email_callback($matches) {
+		$address = $matches[1];
+		$link = $this->encodeEmailAddress($address);
+		return $this->hashPart($link);
+	}
+
+
+	function encodeEmailAddress($addr) {
+	#
+	#	Input: an email address, e.g. "foo@example.com"
+	#
+	#	Output: the email address as a mailto link, with each character
+	#		of the address encoded as either a decimal or hex entity, in
+	#		the hopes of foiling most address harvesting spam bots. E.g.:
+	#
+	#	  
    foo@exampl
+	#        e.com
    
+	#
+	#	Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
+	#   With some optimizations by Milian Wolff.
+	#
+		$addr = "mailto:" . $addr;
+		$chars = preg_split('/(? $char) {
+			$ord = ord($char);
+			# Ignore non-ascii chars.
+			if ($ord < 128) {
+				$r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
+				# roughly 10% raw, 45% hex, 45% dec
+				# '@' *must* be encoded. I insist.
+				if ($r > 90 && $char != '@') /* do nothing */;
+				else if ($r < 45) $chars[$key] = '&#x'.dechex($ord).';';
+				else              $chars[$key] = '&#'.$ord.';';
+			}
+		}
+
+		$addr = implode('', $chars);
+		$text = implode('', array_slice($chars, 7)); # text without `mailto:`
+		$addr = "$text";
+
+		return $addr;
+	}
+
+
+	function parseSpan($str) {
+	#
+	# Take the string $str and parse it into tokens, hashing embeded HTML,
+	# escaped characters and handling code spans.
+	#
+		$output = '';
+
+		$span_re = '{
+				(
+					\\\\'.$this->escape_chars_re.'
+				|
+					(?no_markup ? '' : '
+				|
+							# comment
+				|
+					<\?.*?\?> | <%.*?%>		# processing instruction
+				|
+					<[/!$]?[-a-zA-Z0-9:_]+	# regular tags
+					(?>
+						\s
+						(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
+					)?
+					>
+			').'
+				)
+				}xs';
+
+		while (1) {
+			#
+			# Each loop iteration seach for either the next tag, the next
+			# openning code span marker, or the next escaped character.
+			# Each token is then passed to handleSpanToken.
+			#
+			$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
+
+			# Create token from text preceding tag.
+			if ($parts[0] != "") {
+				$output .= $parts[0];
+			}
+
+			# Check if we reach the end.
+			if (isset($parts[1])) {
+				$output .= $this->handleSpanToken($parts[1], $parts[2]);
+				$str = $parts[2];
+			}
+			else {
+				break;
+			}
+		}
+
+		return $output;
+	}
+
+
+	function handleSpanToken($token, &$str) {
+	#
+	# Handle $token provided by parseSpan by determining its nature and
+	# returning the corresponding value that should replace it.
+	#
+		switch ($token{0}) {
+			case "\\":
+				return $this->hashPart("&#". ord($token{1}). ";");
+			case "`":
+				# Search for end marker in remaining text.
+				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm',
+					$str, $matches))
+				{
+					$str = $matches[2];
+					$codespan = $this->makeCodeSpan($matches[1]);
+					return $this->hashPart($codespan);
+				}
+				return $token; // return as text since no ending marker found.
+			default:
+				return $this->hashPart($token);
+		}
+	}
+
+
+	function outdent($text) {
+	#
+	# Remove one level of line-leading tabs or spaces
+	#
+		return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
+	}
+
+
+	# String length function for detab. `_initDetab` will create a function to
+	# hanlde UTF-8 if the default function does not exist.
+	var $utf8_strlen = 'mb_strlen';
+
+	function detab($text) {
+	#
+	# Replace tabs with the appropriate amount of space.
+	#
+		# For each line we separate the line in blocks delemited by
+		# tab characters. Then we reconstruct every line by adding the
+		# appropriate number of space between each blocks.
+
+		$text = preg_replace_callback('/^.*\t.*$/m',
+			array(&$this, '_detab_callback'), $text);
+
+		return $text;
+	}
+	function _detab_callback($matches) {
+		$line = $matches[0];
+		$strlen = $this->utf8_strlen; # strlen function for UTF-8.
+
+		# Split in blocks.
+		$blocks = explode("\t", $line);
+		# Add each blocks to the line.
+		$line = $blocks[0];
+		unset($blocks[0]); # Do not add first block twice.
+		foreach ($blocks as $block) {
+			# Calculate amount of space, insert spaces, insert block.
+			$amount = $this->tab_width -
+				$strlen($line, 'UTF-8') % $this->tab_width;
+			$line .= str_repeat(" ", $amount) . $block;
+		}
+		return $line;
+	}
+	function _initDetab() {
+	#
+	# Check for the availability of the function in the `utf8_strlen` property
+	# (initially `mb_strlen`). If the function is not available, create a
+	# function that will loosely count the number of UTF-8 characters with a
+	# regular expression.
+	#
+		if (function_exists($this->utf8_strlen)) return;
+		$this->utf8_strlen = create_function('$text', 'return preg_match_all(
+			"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/",
+			$text, $m);');
+	}
+
+
+	function unhash($text) {
+	#
+	# Swap back in all the tags hashed by _HashHTMLBlocks.
+	#
+		return preg_replace_callback('/(.)\x1A[0-9]+\1/',
+			array(&$this, '_unhash_callback'), $text);
+	}
+	function _unhash_callback($matches) {
+		return $this->html_hashes[$matches[0]];
+	}
+
+}
+
+/*
+
+PHP Markdown
+============
+
+Description
+-----------
+
+This is a PHP translation of the original Markdown formatter written in
+Perl by John Gruber.
+
+Markdown is a text-to-HTML filter; it translates an easy-to-read /
+easy-to-write structured text format into HTML. Markdown's text format
+is most similar to that of plain text email, and supports features such
+as headers, *emphasis*, code blocks, blockquotes, and links.
+
+Markdown's syntax is designed not as a generic markup language, but
+specifically to serve as a front-end to (X)HTML. You can use span-level
+HTML tags anywhere in a Markdown document, and you can use block level
+HTML tags (like 
     and  as well).
+
+For more information about Markdown's syntax, see:
+
+
+
+
+Bugs
+----
+
+To file bug reports please send email to:
+
+
+
+Please include with your report: (1) the example input; (2) the output you
+expected; (3) the output Markdown actually produced.
+
+
+Version History
+---------------
+
+See the readme file for detailed release notes for this version.
+
+
+Copyright and License
+---------------------
+
+PHP Markdown
+Copyright (c) 2004-2009 Michel Fortin
+
+All rights reserved.
+
+Based on Markdown
+Copyright (c) 2003-2006 John Gruber
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+*	Redistributions of source code must retain the above copyright notice,
+	this list of conditions and the following disclaimer.
+
+*	Redistributions in binary form must reproduce the above copyright
+	notice, this list of conditions and the following disclaimer in the
+	documentation and/or other materials provided with the distribution.
+
+*	Neither the name "Markdown" nor the names of its contributors may
+	be used to endorse or promote products derived from this software
+	without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as
+is" and any express or implied warranties, including, but not limited
+to, the implied warranties of merchantability and fitness for a
+particular purpose are disclaimed. In no event shall the copyright owner
+or contributors be liable for any direct, indirect, incidental, special,
+exemplary, or consequential damages (including, but not limited to,
+procurement of substitute goods or services; loss of use, data, or
+profits; or business interruption) however caused and on any theory of
+liability, whether in contract, strict liability, or tort (including
+negligence or otherwise) arising in any way out of the use of this
+software, even if advised of the possibility of such damage.
+
+*/
+?>
diff --git a/pagedown/Markdown.Converter.js b/pagedown/Markdown.Converter.js
new file mode 100644
index 0000000..62bcf69
--- /dev/null
+++ b/pagedown/Markdown.Converter.js
@@ -0,0 +1,1335 @@
+var Markdown;
+
+if (typeof exports === "object" && typeof require === "function") // we're in a CommonJS (e.g. Node.js) module
+    Markdown = exports;
+else
+    Markdown = {};
+
+// The following text is included for historical reasons, but should
+// be taken with a pinch of salt; it's not all true anymore.
+
+//
+// Wherever possible, Showdown is a straight, line-by-line port
+// of the Perl version of Markdown.
+//
+// This is not a normal parser design; it's basically just a
+// series of string substitutions.  It's hard to read and
+// maintain this way,  but keeping Showdown close to the original
+// design makes it easier to port new features.
+//
+// More importantly, Showdown behaves like markdown.pl in most
+// edge cases.  So web applications can do client-side preview
+// in Javascript, and then build identical HTML on the server.
+//
+// This port needs the new RegExp functionality of ECMA 262,
+// 3rd Edition (i.e. Javascript 1.5).  Most modern web browsers
+// should do fine.  Even with the new regular expression features,
+// We do a lot of work to emulate Perl's regex functionality.
+// The tricky changes in this file mostly have the "attacklab:"
+// label.  Major or self-explanatory changes don't.
+//
+// Smart diff tools like Araxis Merge will be able to match up
+// this file with markdown.pl in a useful way.  A little tweaking
+// helps: in a copy of markdown.pl, replace "#" with "//" and
+// replace "$text" with "text".  Be sure to ignore whitespace
+// and line endings.
+//
+
+
+//
+// Usage:
+//
+//   var text = "Markdown *rocks*.";
+//
+//   var converter = new Markdown.Converter();
+//   var html = converter.makeHtml(text);
+//
+//   alert(html);
+//
+// Note: move the sample code to the bottom of this
+// file before uncommenting it.
+//
+
+(function () {
+
+    function identity(x) { return x; }
+    function returnFalse(x) { return false; }
+
+    function HookCollection() { }
+
+    HookCollection.prototype = {
+
+        chain: function (hookname, func) {
+            var original = this[hookname];
+            if (!original)
+                throw new Error("unknown hook " + hookname);
+
+            if (original === identity)
+                this[hookname] = func;
+            else
+                this[hookname] = function (x) { return func(original(x)); }
+        },
+        set: function (hookname, func) {
+            if (!this[hookname])
+                throw new Error("unknown hook " + hookname);
+            this[hookname] = func;
+        },
+        addNoop: function (hookname) {
+            this[hookname] = identity;
+        },
+        addFalse: function (hookname) {
+            this[hookname] = returnFalse;
+        }
+    };
+
+    Markdown.HookCollection = HookCollection;
+
+    // g_urls and g_titles allow arbitrary user-entered strings as keys. This
+    // caused an exception (and hence stopped the rendering) when the user entered
+    // e.g. [push] or [__proto__]. Adding a prefix to the actual key prevents this
+    // (since no builtin property starts with "s_"). See
+    // http://meta.stackoverflow.com/questions/64655/strange-wmd-bug
+    // (granted, switching from Array() to Object() alone would have left only __proto__
+    // to be a problem)
+    function SaveHash() { }
+    SaveHash.prototype = {
+        set: function (key, value) {
+            this["s_" + key] = value;
+        },
+        get: function (key) {
+            return this["s_" + key];
+        }
+    };
+
+    Markdown.Converter = function () {
+        var pluginHooks = this.hooks = new HookCollection();
+        pluginHooks.addNoop("plainLinkText");  // given a URL that was encountered by itself (without markup), should return the link text that's to be given to this link
+        pluginHooks.addNoop("preConversion");  // called with the orignal text as given to makeHtml. The result of this plugin hook is the actual markdown source that will be cooked
+        pluginHooks.addNoop("postConversion"); // called with the final cooked HTML code. The result of this plugin hook is the actual output of makeHtml
+
+        //
+        // Private state of the converter instance:
+        //
+
+        // Global hashes, used by various utility routines
+        var g_urls;
+        var g_titles;
+        var g_html_blocks;
+
+        // Used to track when we're inside an ordered or unordered list
+        // (see _ProcessListItems() for details):
+        var g_list_level;
+
+        this.makeHtml = function (text) {
+
+            //
+            // Main function. The order in which other subs are called here is
+            // essential. Link and image substitutions need to happen before
+            // _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the 
+            // and  tags get encoded.
+            //
+
+            // This will only happen if makeHtml on the same converter instance is called from a plugin hook.
+            // Don't do that.
+            if (g_urls)
+                throw new Error("Recursive call to converter.makeHtml");
+
+            // Create the private state objects.
+            g_urls = new SaveHash();
+            g_titles = new SaveHash();
+            g_html_blocks = [];
+            g_list_level = 0;
+
+            text = pluginHooks.preConversion(text);
+
+            // attacklab: Replace ~ with ~T
+            // This lets us use tilde as an escape char to avoid md5 hashes
+            // The choice of character is arbitray; anything that isn't
+            // magic in Markdown will work.
+            text = text.replace(/~/g, "~T");
+
+            // attacklab: Replace $ with ~D
+            // RegExp interprets $ as a special character
+            // when it's in a replacement string
+            text = text.replace(/\$/g, "~D");
+
+            // Standardize line endings
+            text = text.replace(/\r\n/g, "\n"); // DOS to Unix
+            text = text.replace(/\r/g, "\n"); // Mac to Unix
+
+            // Make sure text begins and ends with a couple of newlines:
+            text = "\n\n" + text + "\n\n";
+
+            // Convert all tabs to spaces.
+            text = _Detab(text);
+
+            // Strip any lines consisting only of spaces and tabs.
+            // This makes subsequent regexen easier to write, because we can
+            // match consecutive blank lines with /\n+/ instead of something
+            // contorted like /[ \t]*\n+/ .
+            text = text.replace(/^[ \t]+$/mg, "");
+
+            // Turn block-level HTML blocks into hash entries
+            text = _HashHTMLBlocks(text);
+
+            // Strip link definitions, store in hashes.
+            text = _StripLinkDefinitions(text);
+
+            text = _RunBlockGamut(text);
+
+            text = _UnescapeSpecialChars(text);
+
+            // attacklab: Restore dollar signs
+            text = text.replace(/~D/g, "$$");
+
+            // attacklab: Restore tildes
+            text = text.replace(/~T/g, "~");
+
+            text = pluginHooks.postConversion(text);
+
+            g_html_blocks = g_titles = g_urls = null;
+
+            return text;
+        };
+
+        function _StripLinkDefinitions(text) {
+            //
+            // Strips link definitions from text, stores the URLs and titles in
+            // hash references.
+            //
+
+            // Link defs are in the form: ^[id]: url "optional title"
+
+            /*
+            text = text.replace(/
+                ^[ ]{0,3}\[(.+)\]:  // id = $1  attacklab: g_tab_width - 1
+                [ \t]*
+                \n?                 // maybe *one* newline
+                [ \t]*
+                ?          // url = $2
+                (?=\s|$)            // lookahead for whitespace instead of the lookbehind removed below
+                [ \t]*
+                \n?                 // maybe one newline
+                [ \t]*
+                (                   // (potential) title = $3
+                    (\n*)           // any lines skipped = $4 attacklab: lookbehind removed
+                    [ \t]+
+                    ["(]
+                    (.+?)           // title = $5
+                    [")]
+                    [ \t]*
+                )?                  // title is optional
+                (?:\n+|$)
+            /gm, function(){...});
+            */
+
+            text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*?(?=\s|$)[ \t]*\n?[ \t]*((\n*)["(](.+?)[")][ \t]*)?(?:\n+)/gm,
+                function (wholeMatch, m1, m2, m3, m4, m5) {
+                    m1 = m1.toLowerCase();
+                    g_urls.set(m1, _EncodeAmpsAndAngles(m2));  // Link IDs are case-insensitive
+                    if (m4) {
+                        // Oops, found blank lines, so it's not a title.
+                        // Put back the parenthetical statement we stole.
+                        return m3;
+                    } else if (m5) {
+                        g_titles.set(m1, m5.replace(/"/g, """));
+                    }
+
+                    // Completely remove the definition from the text
+                    return "";
+                }
+            );
+
+            return text;
+        }
+
+        function _HashHTMLBlocks(text) {
+
+            // Hashify HTML blocks:
+            // We only want to do this for block-level HTML tags, such as headers,
+            // lists, and tables. That's because we still want to wrap 
    s around
+            // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
+            // phrase emphasis, and spans. The list of tags we're looking for is
+            // hard-coded:
+            var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del"
+            var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"
+
+            // First, look for nested blocks, e.g.:
+            //   
    
+            //     
    
+            //     tags for inner block must be indented.
+            //     
    
+            //   
    
+            //
+            // The outermost tags must start at the left margin for this to match, and
+            // the inner nested divs must be indented.
+            // We need to do this before the next, more liberal match, because the next
+            // match will start at the first `
    ` and stop at the first `
    `.
+
+            // attacklab: This regex can be expensive when it fails.
+
+            /*
+            text = text.replace(/
+                (                       // save in $1
+                    ^                   // start of line  (with /m)
+                    <($block_tags_a)    // start tag = $2
+                    \b                  // word break
+                                        // attacklab: hack around khtml/pcre bug...
+                    [^\r]*?\n           // any number of lines, minimally matching
+                                   // the matching end tag
+                    [ \t]*              // trailing spaces/tabs
+                    (?=\n+)             // followed by a newline
+                )                       // attacklab: there are sentinel newlines at end of document
+            /gm,function(){...}};
+            */
+            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);
+
+            //
+            // Now match more liberally, simply from `\n` to `\n`
+            //
+
+            /*
+            text = text.replace(/
+                (                       // save in $1
+                    ^                   // start of line  (with /m)
+                    <($block_tags_b)    // start tag = $2
+                    \b                  // word break
+                                        // attacklab: hack around khtml/pcre bug...
+                    [^\r]*?             // any number of lines, minimally matching
+                    .*             // the matching end tag
+                    [ \t]*              // trailing spaces/tabs
+                    (?=\n+)             // followed by a newline
+                )                       // attacklab: there are sentinel newlines at end of document
+            /gm,function(){...}};
+            */
+            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);
+
+            // Special case just for 
    . It was easier to make a special case than
+            // to make the other regex more complicated.
+
+            /*
+            text = text.replace(/
+                \n                  // Starting after a blank line
+                [ ]{0,3}
+                (                   // save in $1
+                    (<(hr)          // start tag = $2
+                        \b          // word break
+                        ([^<>])*?
+                    \/?>)           // the matching end tag
+                    [ \t]*
+                    (?=\n{2,})      // followed by a blank line
+                )
+            /g,hashElement);
+            */
+            text = text.replace(/\n[ ]{0,3}((<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g, hashElement);
+
+            // Special case for standalone HTML comments:
+
+            /*
+            text = text.replace(/
+                \n\n                                            // Starting after a blank line
+                [ ]{0,3}                                        // attacklab: g_tab_width - 1
+                (                                               // save in $1
+                    -]|-[^>])(?:[^-]|-[^-])*)--)   // see http://www.w3.org/TR/html-markup/syntax.html#comments and http://meta.stackoverflow.com/q/95256
+                    >
+                    [ \t]*
+                    (?=\n{2,})                                  // followed by a blank line
+                )
+            /g,hashElement);
+            */
+            text = text.replace(/\n\n[ ]{0,3}(-]|-[^>])(?:[^-]|-[^-])*)--)>[ \t]*(?=\n{2,}))/g, hashElement);
+
+            // PHP and ASP-style processor instructions ( and <%...%>)
+
+            /*
+            text = text.replace(/
+                (?:
+                    \n\n            // Starting after a blank line
+                )
+                (                   // save in $1
+                    [ ]{0,3}        // attacklab: g_tab_width - 1
+                    (?:
+                        <([?%])     // $2
+                        [^\r]*?
+                        \2>
+                    )
+                    [ \t]*
+                    (?=\n{2,})      // followed by a blank line
+                )
+            /g,hashElement);
+            */
+            text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g, hashElement);
+
+            return text;
+        }
+
+        function hashElement(wholeMatch, m1) {
+            var blockText = m1;
+
+            // Undo double lines
+            blockText = blockText.replace(/^\n+/, "");
+
+            // strip trailing blank lines
+            blockText = blockText.replace(/\n+$/g, "");
+
+            // Replace the element text with a marker ("~KxK" where x is its key)
+            blockText = "\n\n~K" + (g_html_blocks.push(blockText) - 1) + "K\n\n";
+
+            return blockText;
+        }
+
+        function _RunBlockGamut(text, doNotUnhash) {
+            //
+            // These are all the transformations that form block-level
+            // tags like paragraphs, headers, and list items.
+            //
+            text = _DoHeaders(text);
+
+            // Do Horizontal Rules:
+            var replacement = "
    \n";
+            text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm, replacement);
+            text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm, replacement);
+            text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm, replacement);
+
+            text = _DoLists(text);
+            text = _DoCodeBlocks(text);
+            text = _DoBlockQuotes(text);
+
+            // We already ran _HashHTMLBlocks() before, in Markdown(), but that
+            // was to escape raw HTML in the original Markdown source. This time,
+            // we're escaping the markup we've just created, so that we don't wrap
+            // 
     tags around block-level tags.
+            text = _HashHTMLBlocks(text);
+            text = _FormParagraphs(text, doNotUnhash);
+
+            return text;
+        }
+
+        function _RunSpanGamut(text) {
+            //
+            // These are all the transformations that occur *within* block-level
+            // tags like paragraphs, headers, and list items.
+            //
+
+            text = _DoCodeSpans(text);
+            text = _EscapeSpecialCharsWithinTagAttributes(text);
+            text = _EncodeBackslashEscapes(text);
+
+            // Process anchor and image tags. Images must come first,
+            // because ![foo][f] looks like an anchor.
+            text = _DoImages(text);
+            text = _DoAnchors(text);
+
+            // Make links out of things like ``
+            // Must come after _DoAnchors(), because you can use < and >
+            // delimiters in inline links like [this]().
+            text = _DoAutoLinks(text);
+
+            text = text.replace(/~P/g, "://"); // put in place to prevent autolinking; reset now
+
+            text = _EncodeAmpsAndAngles(text);
+            text = _DoItalicsAndBold(text);
+
+            // Do hard breaks:
+			/** SV: don't need trailing spaces for line breaks */
+            text = text.replace(/\n/g, "
    \n");
+
+            return text;
+        }
+
+        function _EscapeSpecialCharsWithinTagAttributes(text) {
+            //
+            // Within tags -- meaning between < and > -- encode [\ ` * _] so they
+            // don't conflict with their use in Markdown for code, italics and strong.
+            //
+
+            // Build a regex to find HTML tags and comments.  See Friedl's
+            // "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
+
+            // SE: changed the comment part of the regex
+
+            var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|-]|-[^>])(?:[^-]|-[^-])*)--)>)/gi;
+
+            text = text.replace(regex, function (wholeMatch) {
+                var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g, "$1`");
+                tag = escapeCharacters(tag, wholeMatch.charAt(1) == "!" ? "\\`*_/" : "\\`*_"); // also escape slashes in comments to prevent autolinking there -- http://meta.stackoverflow.com/questions/95987
+                return tag;
+            });
+
+            return text;
+        }
+
+        function _DoAnchors(text) {
+            //
+            // Turn Markdown link shortcuts into XHTML      tags.
+            //
+            //
+            // First, handle reference-style links: [link text] [id]
+            //
+
+            /*
+            text = text.replace(/
+                (                           // wrap whole match in $1
+                    \[
+                    (
+                        (?:
+                            \[[^\]]*\]      // allow brackets nested one level
+                            |
+                            [^\[]           // or anything else
+                        )*
+                    )
+                    \]
+
+                    [ ]?                    // one optional space
+                    (?:\n[ ]*)?             // one optional newline followed by spaces
+
+                    \[
+                    (.*?)                   // id = $3
+                    \]
+                )
+                ()()()()                    // pad remaining backreferences
+            /g, writeAnchorTag);
+            */
+            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeAnchorTag);
+
+            //
+            // Next, inline-style links: [link text](url "optional title")
+            //
+
+            /*
+            text = text.replace(/
+                (                           // wrap whole match in $1
+                    \[
+                    (
+                        (?:
+                            \[[^\]]*\]      // allow brackets nested one level
+                            |
+                            [^\[\]]         // or anything else
+                        )*
+                    )
+                    \]
+                    \(                      // literal paren
+                    [ \t]*
+                    ()                      // no id, so leave $3 empty
+                    ?
+                    [ \t]*
+                    (                       // $5
+                        (['"])              // quote char = $6
+                        (.*?)               // Title = $7
+                        \6                  // matching quote
+                        [ \t]*              // ignore any spaces/tabs between closing quote and )
+                    )?                      // title is optional
+                    \)
+                )
+            /g, writeAnchorTag);
+            */
+
+            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeAnchorTag);
+
+            //
+            // Last, handle reference-style shortcuts: [link text]
+            // These must come last in case you've also got [link test][1]
+            // or [link test](/foo)
+            //
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    \[
+                    ([^\[\]]+)      // link text = $2; can't contain '[' or ']'
+                    \]
+                )
+                ()()()()()          // pad rest of backreferences
+            /g, writeAnchorTag);
+            */
+            text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);
+
+            return text;
+        }
+
+        function writeAnchorTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
+            if (m7 == undefined) m7 = "";
+            var whole_match = m1;
+            var link_text = m2.replace(/:\/\//g, "~P"); // to prevent auto-linking withing the link. will be converted back after the auto-linker runs
+            var link_id = m3.toLowerCase();
+            var url = m4;
+            var title = m7;
+
+            if (url == "") {
+                if (link_id == "") {
+                    // lower-case and turn embedded newlines into spaces
+                    link_id = link_text.toLowerCase().replace(/ ?\n/g, " ");
+                }
+                url = "#" + link_id;
+
+                if (g_urls.get(link_id) != undefined) {
+                    url = g_urls.get(link_id);
+                    if (g_titles.get(link_id) != undefined) {
+                        title = g_titles.get(link_id);
+                    }
+                }
+                else {
+                    if (whole_match.search(/\(\s*\)$/m) > -1) {
+                        // Special case for explicit empty url
+                        url = "";
+                    } else {
+                        return whole_match;
+                    }
+                }
+            }
+            url = encodeProblemUrlChars(url);
+            url = escapeCharacters(url, "*_");
+            var result = "";
+
+            return result;
+        }
+
+        function _DoImages(text) {
+            //
+            // Turn Markdown image shortcuts into  tags.
+            //
+
+            //
+            // First, handle reference-style labeled images: ![alt text][id]
+            //
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    !\[
+                    (.*?)           // alt text = $2
+                    \]
+
+                    [ ]?            // one optional space
+                    (?:\n[ ]*)?     // one optional newline followed by spaces
+
+                    \[
+                    (.*?)           // id = $3
+                    \]
+                )
+                ()()()()            // pad rest of backreferences
+            /g, writeImageTag);
+            */
+            text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeImageTag);
+
+            //
+            // Next, handle inline images:  ![alt text](url "optional title")
+            // Don't forget: encode * and _
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    !\[
+                    (.*?)           // alt text = $2
+                    \]
+                    \s?             // One optional whitespace character
+                    \(              // literal paren
+                    [ \t]*
+                    ()              // no id, so leave $3 empty
+                    ?      // src url = $4
+                    [ \t]*
+                    (               // $5
+                        (['"])      // quote char = $6
+                        (.*?)       // title = $7
+                        \6          // matching quote
+                        [ \t]*
+                    )?              // title is optional
+                    \)
+                )
+            /g, writeImageTag);
+            */
+            text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeImageTag);
+
+            return text;
+        }
+
+        function attributeEncode(text) {
+            // unconditionally replace angle brackets here -- what ends up in an attribute (e.g. alt or title)
+            // never makes sense to have verbatim HTML in it (and the sanitizer would totally break it)
+            return text.replace(/>/g, ">").replace(/" + _RunSpanGamut(m1) + "\n\n"; }
+            );
+
+            text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
+                function (matchFound, m1) { return "
    " + _RunSpanGamut(m1) + "
    \n\n"; }
+            );
+
+            // atx-style headers:
+            //  # Header 1
+            //  ## Header 2
+            //  ## Header 2 with closing hashes ##
+            //  ...
+            //  ###### Header 6
+            //
+
+            /*
+            text = text.replace(/
+                ^(\#{1,6})      // $1 = string of #'s
+                [ \t]*
+                (.+?)           // $2 = Header text
+                [ \t]*
+                \#*             // optional closing #'s (not counted)
+                \n+
+            /gm, function() {...});
+            */
+
+			/** SV: limit headers to H2..6 */
+            text = text.replace(/^(\#{1,5})[ \t]*(.+?)[ \t]*\#*\n+/gm,
+                function (wholeMatch, m1, m2) {
+                    var h_level = m1.length + 1;
+                    return "" + _RunSpanGamut(m2) + "\n\n";
+                }
+            );
+
+            return text;
+        }
+
+        function _DoLists(text) {
+            //
+            // Form HTML ordered (numbered) and unordered (bulleted) lists.
+            //
+
+            // attacklab: add sentinel to hack around khtml/safari bug:
+            // http://bugs.webkit.org/show_bug.cgi?id=11231
+            text += "~0";
+
+            // Re-usable pattern to match any entirel ul or ol list:
+
+            /*
+            var whole_list = /
+                (                                   // $1 = whole list
+                    (                               // $2
+                        [ ]{0,3}                    // attacklab: g_tab_width - 1
+                        ([*+-]|\d+[.])              // $3 = first list item marker
+                        [ \t]+
+                    )
+                    [^\r]+?
+                    (                               // $4
+                        ~0                          // sentinel for workaround; should be $
+                        |
+                        \n{2,}
+                        (?=\S)
+                        (?!                         // Negative lookahead for another list item marker
+                            [ \t]*
+                            (?:[*+-]|\d+[.])[ \t]+
+                        )
+                    )
+                )
+            /g
+            */
+            var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;
+
+            if (g_list_level) {
+                text = text.replace(whole_list, function (wholeMatch, m1, m2) {
+                    var list = m1;
+                    var list_type = (m2.search(/[*+-]/g) > -1) ? "ul" : "ol";
+
+                    var result = _ProcessListItems(list, list_type);
+
+                    // Trim any trailing whitespace, to put the closing ``
+                    // up on the preceding line, to get it past the current stupid
+                    // HTML block parser. This is a hack to work around the terrible
+                    // hack that is the HTML block parser.
+                    result = result.replace(/\s+$/, "");
+                    result = "<" + list_type + ">" + result + "\n";
+                    return result;
+                });
+            } else {
+                whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
+                text = text.replace(whole_list, function (wholeMatch, m1, m2, m3) {
+                    var runup = m1;
+                    var list = m2;
+
+                    var list_type = (m3.search(/[*+-]/g) > -1) ? "ul" : "ol";
+                    var result = _ProcessListItems(list, list_type);
+                    result = runup + "<" + list_type + ">\n" + result + "\n";
+                    return result;
+                });
+            }
+
+            // attacklab: strip sentinel
+            text = text.replace(/~0/, "");
+
+            return text;
+        }
+
+        var _listItemMarkers = { ol: "\\d+[.]", ul: "[*+-]" };
+
+        function _ProcessListItems(list_str, list_type) {
+            //
+            //  Process the contents of a single ordered or unordered list, splitting it
+            //  into individual list items.
+            //
+            //  list_type is either "ul" or "ol".
+
+            // The $g_list_level global keeps track of when we're inside a list.
+            // Each time we enter a list, we increment it; when we leave a list,
+            // we decrement. If it's zero, we're not in a list anymore.
+            //
+            // We do this because when we're not inside a list, we want to treat
+            // something like this:
+            //
+            //    I recommend upgrading to version
+            //    8. Oops, now this line is treated
+            //    as a sub-list.
+            //
+            // As a single paragraph, despite the fact that the second line starts
+            // with a digit-period-space sequence.
+            //
+            // Whereas when we're inside a list (or sub-list), that line will be
+            // treated as the start of a sub-list. What a kludge, huh? This is
+            // an aspect of Markdown's syntax that's hard to parse perfectly
+            // without resorting to mind-reading. Perhaps the solution is to
+            // change the syntax rules such that sub-lists must start with a
+            // starting cardinal number; e.g. "1." or "a.".
+
+            g_list_level++;
+
+            // trim trailing blank lines:
+            list_str = list_str.replace(/\n{2,}$/, "\n");
+
+            // attacklab: add sentinel to emulate \z
+            list_str += "~0";
+
+            // In the original attacklab showdown, list_type was not given to this function, and anything
+            // that matched /[*+-]|\d+[.]/ would just create the next 
  • , causing this mismatch:
+            //
+            //  Markdown          rendered by WMD        rendered by MarkdownSharp
+            //  ------------------------------------------------------------------
+            //  1. first          1. first               1. first
+            //  2. second         2. second              2. second
+            //  - third           3. third                   * third
+            //
+            // We changed this to behave identical to MarkdownSharp. This is the constructed RegEx,
+            // with {MARKER} being one of \d+[.] or [*+-], depending on list_type:
+
+            /*
+            list_str = list_str.replace(/
+                (^[ \t]*)                       // leading whitespace = $1
+                ({MARKER}) [ \t]+               // list marker = $2
+                ([^\r]+?                        // list item text   = $3
+                    (\n+)
+                )
+                (?=
+                    (~0 | \2 ({MARKER}) [ \t]+)
+                )
+            /gm, function(){...});
+            */
+
+            var marker = _listItemMarkers[list_type];
+            var re = new RegExp("(^[ \\t]*)(" + marker + ")[ \\t]+([^\\r]+?(\\n+))(?=(~0|\\1(" + marker + ")[ \\t]+))", "gm");
+            var last_item_had_a_double_newline = false;
+            list_str = list_str.replace(re,
+                function (wholeMatch, m1, m2, m3) {
+                    var item = m3;
+                    var leading_space = m1;
+                    var ends_with_double_newline = /\n\n$/.test(item);
+                    var contains_double_newline = ends_with_double_newline || item.search(/\n{2,}/) > -1;
+
+                    if (contains_double_newline || last_item_had_a_double_newline) {
+                        item = _RunBlockGamut(_Outdent(item), /* doNotUnhash = */true);
+                    }
+                    else {
+                        // Recursion for sub-lists:
+                        item = _DoLists(_Outdent(item));
+                        item = item.replace(/\n$/, ""); // chomp(item)
+                        item = _RunSpanGamut(item);
+                    }
+                    last_item_had_a_double_newline = ends_with_double_newline;
+                    return "
  • " + item + "
    • \n";
+                }
+            );
+
+            // attacklab: strip sentinel
+            list_str = list_str.replace(/~0/g, "");
+
+            g_list_level--;
+            return list_str;
+        }
+
+        function _DoCodeBlocks(text) {
+            //
+            //  Process Markdown `
    ` blocks.
+            //
+
+            /*
+            text = text.replace(/
+                (?:\n\n|^)
+                (                               // $1 = the code block -- one or more lines, starting with a space/tab
+                    (?:
+                        (?:[ ]{4}|\t)           // Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
+                        .*\n+
+                    )+
+                )
+                (\n*[ ]{0,3}[^ \t\n]|(?=~0))    // attacklab: g_tab_width
+            /g ,function(){...});
+            */
+
+            // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
+            text += "~0";
+
+            text = text.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
+                function (wholeMatch, m1, m2) {
+                    var codeblock = m1;
+                    var nextChar = m2;
+
+                    codeblock = _EncodeCode(_Outdent(codeblock));
+                    codeblock = _Detab(codeblock);
+                    codeblock = codeblock.replace(/^\n+/g, ""); // trim leading newlines
+                    codeblock = codeblock.replace(/\n+$/g, ""); // trim trailing whitespace
+
+                    codeblock = "
    " + codeblock + "\n
    ";
+
+                    return "\n\n" + codeblock + "\n\n" + nextChar;
+                }
+            );
+
+            // attacklab: strip sentinel
+            text = text.replace(/~0/, "");
+
+            return text;
+        }
+
+        function hashBlock(text) {
+            text = text.replace(/(^\n+|\n+$)/g, "");
+            return "\n\n~K" + (g_html_blocks.push(text) - 1) + "K\n\n";
+        }
+
+        function _DoCodeSpans(text) {
+            //
+            // * Backtick quotes are used for  spans.
+            //
+            // * You can use multiple backticks as the delimiters if you want to
+            //   include literal backticks in the code span. So, this input:
+            //
+            //      Just type ``foo `bar` baz`` at the prompt.
+            //
+            //   Will translate to:
+            //
+            //      
    Just type foo `bar` baz at the prompt.
    
+            //
+            //   There's no arbitrary limit to the number of backticks you
+            //   can use as delimters. If you need three consecutive backticks
+            //   in your code, use four for delimiters, etc.
+            //
+            // * You can use spaces to get literal backticks at the edges:
+            //
+            //      ... type `` `bar` `` ...
+            //
+            //   Turns to:
+            //
+            //      ... type `bar` ...
+            //
+
+            /*
+            text = text.replace(/
+                (^|[^\\])       // Character before opening ` can't be a backslash
+                (`+)            // $2 = Opening run of `
+                (               // $3 = The code block
+                    [^\r]*?
+                    [^`]        // attacklab: work around lack of lookbehind
+                )
+                \2              // Matching closer
+                (?!`)
+            /gm, function(){...});
+            */
+
+            text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
+                function (wholeMatch, m1, m2, m3, m4) {
+                    var c = m3;
+                    c = c.replace(/^([ \t]*)/g, ""); // leading whitespace
+                    c = c.replace(/[ \t]*$/g, ""); // trailing whitespace
+                    c = _EncodeCode(c);
+                    c = c.replace(/:\/\//g, "~P"); // to prevent auto-linking. Not necessary in code *blocks*, but in code spans. Will be converted back after the auto-linker runs.
+                    return m1 + "" + c + "";
+                }
+            );
+
+            return text;
+        }
+
+        function _EncodeCode(text) {
+            //
+            // Encode/escape certain characters inside Markdown code runs.
+            // The point is that in code, these characters are literals,
+            // and lose their special Markdown meanings.
+            //
+            // Encode all ampersands; HTML entities are not
+            // entities within a Markdown code span.
+            text = text.replace(/&/g, "&");
+
+            // Do the angle bracket song and dance:
+            text = text.replace(//g, ">");
+
+            // Now, escape characters that are magic in Markdown:
+            text = escapeCharacters(text, "\*_{}[]\\", false);
+
+            // jj the line above breaks this:
+            //---
+
+            //* Item
+
+            //   1. Subitem
+
+            //            special char: *
+            //---
+
+            return text;
+        }
+
+        function _DoItalicsAndBold(text) {
+
+            //  must go first:
+            text = text.replace(/([\W_]|^)(\*\*|__)(?=\S)([^\r]*?\S[\*_]*)\2([\W_]|$)/g,
+            "$1$3$4");
+
+            text = text.replace(/([\W_]|^)(\*|_)(?=\S)([^\r\*_]*?\S)\2([\W_]|$)/g,
+            "$1$3$4");
+
+            return text;
+        }
+
+        function _DoBlockQuotes(text) {
+
+            /*
+            text = text.replace(/
+                (                           // Wrap whole match in $1
+                    (
+                        ^[ \t]*>[ \t]?      // '>' at the start of a line
+                        .+\n                // rest of the first line
+                        (.+\n)*             // subsequent consecutive lines
+                        \n*                 // blanks
+                    )+
+                )
+            /gm, function(){...});
+            */
+
+            text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
+                function (wholeMatch, m1) {
+                    var bq = m1;
+
+                    // attacklab: hack around Konqueror 3.5.4 bug:
+                    // "----------bug".replace(/^-/g,"") == "bug"
+
+                    bq = bq.replace(/^[ \t]*>[ \t]?/gm, "~0"); // trim one level of quoting
+
+                    // attacklab: clean up hack
+                    bq = bq.replace(/~0/g, "");
+
+                    bq = bq.replace(/^[ \t]+$/gm, "");     // trim whitespace-only lines
+                    bq = _RunBlockGamut(bq);             // recurse
+
+                    bq = bq.replace(/(^|\n)/g, "$1  ");
+                    // These leading spaces screw with 
     content, so we need to fix that:
+                    bq = bq.replace(
+                            /(\s*
    [^\r]+?<\/pre>)/gm,
+                        function (wholeMatch, m1) {
+                            var pre = m1;
+                            // attacklab: hack around Konqueror 3.5.4 bug:
+                            pre = pre.replace(/^  /mg, "~0");
+                            pre = pre.replace(/~0/g, "");
+                            return pre;
+                        });
+
+                    return hashBlock("
    \n" + bq + "\n
    ");
+                }
+            );
+            return text;
+        }
+
+        function _FormParagraphs(text, doNotUnhash) {
+            //
+            //  Params:
+            //    $text - string to process with html 
     tags
+            //
+
+            // Strip leading and trailing lines:
+            text = text.replace(/^\n+/g, "");
+            text = text.replace(/\n+$/g, "");
+
+            var grafs = text.split(/\n{2,}/g);
+            var grafsOut = [];
+
+            var markerRe = /~K(\d+)K/;
+
+            //
+            // Wrap 
     tags.
+            //
+            var end = grafs.length;
+            for (var i = 0; i < end; i++) {
+                var str = grafs[i];
+
+                // if this is an HTML marker, copy it
+                if (markerRe.test(str)) {
+                    grafsOut.push(str);
+                }
+                else if (/\S/.test(str)) {
+                    str = _RunSpanGamut(str);
+                    str = str.replace(/^([ \t]*)/g, "
    ");
+                    str += "
    "
+                    grafsOut.push(str);
+                }
+
+            }
+            //
+            // Unhashify HTML blocks
+            //
+            if (!doNotUnhash) {
+                end = grafsOut.length;
+                for (var i = 0; i < end; i++) {
+                    var foundAny = true;
+                    while (foundAny) { // we may need several runs, since the data may be nested
+                        foundAny = false;
+                        grafsOut[i] = grafsOut[i].replace(/~K(\d+)K/g, function (wholeMatch, id) {
+                            foundAny = true;
+                            return g_html_blocks[id];
+                        });
+                    }
+                }
+            }
+            return grafsOut.join("\n\n");
+        }
+
+        function _EncodeAmpsAndAngles(text) {
+            // Smart processing for ampersands and angle brackets that need to be encoded.
+
+            // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
+            //   http://bumppo.net/projects/amputator/
+            text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g, "&");
+
+            // Encode naked <'s
+            text = text.replace(/<(?![a-z\/?\$!])/gi, "<");
+
+            return text;
+        }
+
+        function _EncodeBackslashEscapes(text) {
+            //
+            //   Parameter:  String.
+            //   Returns:    The string, with after processing the following backslash
+            //               escape sequences.
+            //
+
+            // attacklab: The polite way to do this is with the new
+            // escapeCharacters() function:
+            //
+            //     text = escapeCharacters(text,"\\",true);
+            //     text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
+            //
+            // ...but we're sidestepping its use of the (slow) RegExp constructor
+            // as an optimization for Firefox.  This function gets called a LOT.
+
+            text = text.replace(/\\(\\)/g, escapeCharacters_callback);
+            text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g, escapeCharacters_callback);
+            return text;
+        }
+
+        function _DoAutoLinks(text) {
+
+            // note that at this point, all other URL in the text are already hyperlinked as     
+            // *except* for the  case
+
+            // automatically add < and > around unadorned raw hyperlinks
+            // must be preceded by space/BOF and followed by non-word/EOF character
+            text = text.replace(/(^|\s)(https?|ftp)(:\/\/[-A-Z0-9+&@#\/%?=~_|\[\]\(\)!:,\.;]*[-A-Z0-9+&@#\/%=~_|\[\]])($|\W)/gi, "$1<$2$3>$4");
+
+            //  autolink anything like 
+
+            var replacer = function (wholematch, m1) { return "" + pluginHooks.plainLinkText(m1) + ""; }
+            text = text.replace(/<((https?|ftp):[^'">\s]+)>/gi, replacer);
+
+            // Email addresses: 
+            /*
+            text = text.replace(/
+                <
+                (?:mailto:)?
+                (
+                    [-.\w]+
+                    \@
+                    [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
+                )
+                >
+            /gi, _DoAutoLinks_callback());
+            */
+
+            /* disabling email autolinking, since we don't do that on the server, either
+            text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
+                function(wholeMatch,m1) {
+                    return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
+                }
+            );
+            */
+            return text;
+        }
+
+        function _UnescapeSpecialChars(text) {
+            //
+            // Swap back in all the special characters we've hidden.
+            //
+            text = text.replace(/~E(\d+)E/g,
+                function (wholeMatch, m1) {
+                    var charCodeToReplace = parseInt(m1);
+                    return String.fromCharCode(charCodeToReplace);
+                }
+            );
+            return text;
+        }
+
+        function _Outdent(text) {
+            //
+            // Remove one level of line-leading tabs or spaces
+            //
+
+            // 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, "")
+
+            return text;
+        }
+
+        function _Detab(text) {
+            if (!/\t/.test(text))
+                return text;
+
+            var spaces = ["    ", "   ", "  ", " "],
+            skew = 0,
+            v;
+
+            return text.replace(/[\n\t]/g, function (match, offset) {
+                if (match === "\n") {
+                    skew = offset + 1;
+                    return match;
+                }
+                v = (offset - skew) % 4;
+                skew = offset + 1;
+                return spaces[v];
+            });
+        }
+
+        //
+        //  attacklab: Utility functions
+        //
+
+        var _problemUrlChars = /(?:["'*()[\]:]|~D)/g;
+
+        // hex-encodes some unusual "problem" chars in URLs to avoid URL detection problems
+        function encodeProblemUrlChars(url) {
+            if (!url)
+                return "";
+
+            var len = url.length;
+
+            return url.replace(_problemUrlChars, function (match, offset) {
+                if (match == "~D") // escape for dollar
+                    return "%24";
+                if (match == ":") {
+                    if (offset == len - 1 || /[0-9\/]/.test(url.charAt(offset + 1)))
+                        return ":"
+                }
+                return "%" + match.charCodeAt(0).toString(16);
+            });
+        }
+
+
+        function escapeCharacters(text, charsToEscape, afterBackslash) {
+            // First we have to escape the escape characters so that
+            // we can build a character class out of them
+            var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g, "\\$1") + "])";
+
+            if (afterBackslash) {
+                regexString = "\\\\" + regexString;
+            }
+
+            var regex = new RegExp(regexString, "g");
+            text = text.replace(regex, escapeCharacters_callback);
+
+            return text;
+        }
+
+
+        function escapeCharacters_callback(wholeMatch, m1) {
+            var charCodeToEscape = m1.charCodeAt(0);
+            return "~E" + charCodeToEscape + "E";
+        }
+
+    }; // end of the Markdown.Converter constructor
+
+})();
diff --git a/pagedown/Markdown.Editor.js b/pagedown/Markdown.Editor.js
new file mode 100644
index 0000000..25bf5a5
--- /dev/null
+++ b/pagedown/Markdown.Editor.js
@@ -0,0 +1,2170 @@
+// needs Markdown.Converter.js at the moment
+
+(function () {
+
+    var util = {},
+        position = {},
+        ui = {},
+        doc = window.document,
+        re = window.RegExp,
+        nav = window.navigator,
+        SETTINGS = { lineLength: 72 },
+
+    // Used to work around some browser bugs where we can't use feature testing.
+        uaSniffed = {
+            isIE: /msie/.test(nav.userAgent.toLowerCase()),
+            isIE_5or6: /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase()),
+            isOpera: /opera/.test(nav.userAgent.toLowerCase())
+        };
+
+
+    // -------------------------------------------------------------------
+    //  YOUR CHANGES GO HERE
+    //
+    // I've tried to localize the things you are likely to change to
+    // this area.
+    // -------------------------------------------------------------------
+
+	// The text that appears on the upper part of the dialog box when
+	// entering links.
+	var linkDialogText = '
    Enter the web address.
    ';
+	var imageDialogText = '
    Enter the image URL.
    ';
+
+	// The default text that appears in the dialog input box when entering
+	// links.
+	var imageDefaultText = "http://";
+	var linkDefaultText = "http://";
+
+	// The location of your button images relative to the base directory.
+	var imageDirectory = "images/";
+
+	// Some intervals in ms.  These can be adjusted to reduce the control's load.
+	var previewPollInterval = 500;
+	var pastePollInterval = 100;
+
+	// The link and title for the help button
+	var defaultHelpHoverTitle = "Help with formatting";
+
+
+
+    // -------------------------------------------------------------------
+    //  END OF YOUR CHANGES
+    // -------------------------------------------------------------------
+
+    // help, if given, should have a property "handler", the click handler for the help button,
+    // and can have an optional property "title" for the button's tooltip (defaults to "Markdown Editing Help").
+    // If help isn't given, not help button is created.
+    //
+    // The constructed editor object has the methods:
+    // - getConverter() returns the markdown converter object that was passed to the constructor
+    // - run() actually starts the editor; should be called after all necessary plugins are registered. Calling this more than once is a no-op.
+    // - refreshPreview() forces the preview to be updated. This method is only available after run() was called.
+    Markdown.Editor = function (markdownConverter, idPostfix, help) {
+
+        idPostfix = idPostfix || "";
+
+        var hooks = this.hooks = new Markdown.HookCollection();
+        hooks.addNoop("onPreviewRefresh");       // called with no arguments after the preview has been refreshed
+        hooks.addNoop("postBlockquoteCreation"); // called with the user's selection *after* the blockquote was created; should return the actual to-be-inserted text
+        hooks.addFalse("insertImageDialog");     /* called with one parameter: a callback to be called with the URL of the image. If the application creates
+                                                  * its own image insertion dialog, this hook should return true, and the callback should be called with the chosen
+                                                  * image url (or null if the user cancelled). If this hook returns false, the default dialog will be used.
+                                                  */
+
+        this.getConverter = function () { return markdownConverter; }
+
+        var that = this,
+            panels;
+
+        this.run = function () {
+            if (panels)
+                return; // already initialized
+
+            panels = new PanelCollection(idPostfix);
+            var commandManager = new CommandManager(hooks);
+            var previewManager = new PreviewManager(markdownConverter, panels, function () { hooks.onPreviewRefresh(); });
+            var undoManager, uiManager;
+
+            if (!/\?noundo/.test(doc.location.href)) {
+                undoManager = new UndoManager(function () {
+                    previewManager.refresh();
+                    if (uiManager) // not available on the first call
+                        uiManager.setUndoRedoButtonStates();
+                }, panels);
+                this.textOperation = function (f) {
+                    undoManager.setCommandMode();
+                    f();
+                    that.refreshPreview();
+                }
+            }
+
+            uiManager = new UIManager(idPostfix, panels, undoManager, previewManager, commandManager, help);
+            uiManager.setUndoRedoButtonStates();
+
+            var forceRefresh = that.refreshPreview = function () { previewManager.refresh(true); };
+
+            forceRefresh();
+        };
+
+    }
+
+    // before: contains all the text in the input box BEFORE the selection.
+    // after: contains all the text in the input box AFTER the selection.
+    function Chunks() { }
+
+    // startRegex: a regular expression to find the start tag
+    // endRegex: a regular expresssion to find the end tag
+    Chunks.prototype.findTags = function (startRegex, endRegex) {
+
+        var chunkObj = this;
+        var regex;
+
+        if (startRegex) {
+
+            regex = util.extendRegExp(startRegex, "", "$");
+
+            this.before = this.before.replace(regex,
+                function (match) {
+                    chunkObj.startTag = chunkObj.startTag + match;
+                    return "";
+                });
+
+            regex = util.extendRegExp(startRegex, "^", "");
+
+            this.selection = this.selection.replace(regex,
+                function (match) {
+                    chunkObj.startTag = chunkObj.startTag + match;
+                    return "";
+                });
+        }
+
+        if (endRegex) {
+
+            regex = util.extendRegExp(endRegex, "", "$");
+
+            this.selection = this.selection.replace(regex,
+                function (match) {
+                    chunkObj.endTag = match + chunkObj.endTag;
+                    return "";
+                });
+
+            regex = util.extendRegExp(endRegex, "^", "");
+
+            this.after = this.after.replace(regex,
+                function (match) {
+                    chunkObj.endTag = match + chunkObj.endTag;
+                    return "";
+                });
+        }
+    };
+
+    // If remove is false, the whitespace is transferred
+    // to the before/after regions.
+    //
+    // If remove is true, the whitespace disappears.
+    Chunks.prototype.trimWhitespace = function (remove) {
+        var beforeReplacer, afterReplacer, that = this;
+        if (remove) {
+            beforeReplacer = afterReplacer = "";
+        } else {
+            beforeReplacer = function (s) { that.before += s; return ""; }
+            afterReplacer = function (s) { that.after = s + that.after; return ""; }
+        }
+
+        this.selection = this.selection.replace(/^(\s*)/, beforeReplacer).replace(/(\s*)$/, afterReplacer);
+    };
+
+
+    Chunks.prototype.skipLines = function (nLinesBefore, nLinesAfter, findExtraNewlines) {
+
+        if (nLinesBefore === undefined) {
+            nLinesBefore = 1;
+        }
+
+        if (nLinesAfter === undefined) {
+            nLinesAfter = 1;
+        }
+
+        nLinesBefore++;
+        nLinesAfter++;
+
+        var regexText;
+        var replacementText;
+
+        // chrome bug ... documented at: http://meta.stackoverflow.com/questions/63307/blockquote-glitch-in-editor-in-chrome-6-and-7/65985#65985
+        if (navigator.userAgent.match(/Chrome/)) {
+            "X".match(/()./);
+        }
+
+        this.selection = this.selection.replace(/(^\n*)/, "");
+
+        this.startTag = this.startTag + re.$1;
+
+        this.selection = this.selection.replace(/(\n*$)/, "");
+        this.endTag = this.endTag + re.$1;
+        this.startTag = this.startTag.replace(/(^\n*)/, "");
+        this.before = this.before + re.$1;
+        this.endTag = this.endTag.replace(/(\n*$)/, "");
+        this.after = this.after + re.$1;
+
+        if (this.before) {
+
+            regexText = replacementText = "";
+
+            while (nLinesBefore--) {
+                regexText += "\\n?";
+                replacementText += "\n";
+            }
+
+            if (findExtraNewlines) {
+                regexText = "\\n*";
+            }
+            this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
+        }
+
+        if (this.after) {
+
+            regexText = replacementText = "";
+
+            while (nLinesAfter--) {
+                regexText += "\\n?";
+                replacementText += "\n";
+            }
+            if (findExtraNewlines) {
+                regexText = "\\n*";
+            }
+
+            this.after = this.after.replace(new re(regexText, ""), replacementText);
+        }
+    };
+
+    // end of Chunks
+
+    // A collection of the important regions on the page.
+    // Cached so we don't have to keep traversing the DOM.
+    // Also holds ieCachedRange and ieCachedScrollTop, where necessary; working around
+    // this issue:
+    // Internet explorer has problems with CSS sprite buttons that use HTML
+    // lists.  When you click on the background image "button", IE will
+    // select the non-existent link text and discard the selection in the
+    // textarea.  The solution to this is to cache the textarea selection
+    // on the button's mousedown event and set a flag.  In the part of the
+    // code where we need to grab the selection, we check for the flag
+    // and, if it's set, use the cached area instead of querying the
+    // textarea.
+    //
+    // This ONLY affects Internet Explorer (tested on versions 6, 7
+    // and 8) and ONLY on button clicks.  Keyboard shortcuts work
+    // normally since the focus never leaves the textarea.
+    function PanelCollection(postfix) {
+        this.buttonBar = doc.getElementById("wmd-button-bar" + postfix);
+        this.preview = doc.getElementById("wmd-preview" + postfix);
+        this.input = doc.getElementById("wmd-input" + postfix);
+    };
+
+    // Returns true if the DOM element is visible, false if it's hidden.
+    // Checks if display is anything other than none.
+    util.isVisible = function (elem) {
+
+        if (window.getComputedStyle) {
+            // Most browsers
+            return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
+        }
+        else if (elem.currentStyle) {
+            // IE
+            return elem.currentStyle["display"] !== "none";
+        }
+    };
+
+
+    // Adds a listener callback to a DOM element which is fired on a specified
+    // event.
+    util.addEvent = function (elem, event, listener) {
+        if (elem.attachEvent) {
+            // IE only.  The "on" is mandatory.
+            elem.attachEvent("on" + event, listener);
+        }
+        else {
+            // Other browsers.
+            elem.addEventListener(event, listener, false);
+        }
+    };
+
+
+    // Removes a listener callback from a DOM element which is fired on a specified
+    // event.
+    util.removeEvent = function (elem, event, listener) {
+        if (elem.detachEvent) {
+            // IE only.  The "on" is mandatory.
+            elem.detachEvent("on" + event, listener);
+        }
+        else {
+            // Other browsers.
+            elem.removeEventListener(event, listener, false);
+        }
+    };
+
+    // Converts \r\n and \r to \n.
+    util.fixEolChars = function (text) {
+        text = text.replace(/\r\n/g, "\n");
+        text = text.replace(/\r/g, "\n");
+        return text;
+    };
+
+    // Extends a regular expression.  Returns a new RegExp
+    // using pre + regex + post as the expression.
+    // Used in a few functions where we have a base
+    // expression and we want to pre- or append some
+    // conditions to it (e.g. adding "$" to the end).
+    // The flags are unchanged.
+    //
+    // regex is a RegExp, pre and post are strings.
+    util.extendRegExp = function (regex, pre, post) {
+
+        if (pre === null || pre === undefined) {
+            pre = "";
+        }
+        if (post === null || post === undefined) {
+            post = "";
+        }
+
+        var pattern = regex.toString();
+        var flags;
+
+        // Replace the flags with empty space and store them.
+        pattern = pattern.replace(/\/([gim]*)$/, function (wholeMatch, flagsPart) {
+            flags = flagsPart;
+            return "";
+        });
+
+        // Remove the slash delimiters on the regular expression.
+        pattern = pattern.replace(/(^\/|\/$)/g, "");
+        pattern = pre + pattern + post;
+
+        return new re(pattern, flags);
+    }
+
+    // UNFINISHED
+    // The assignment in the while loop makes jslint cranky.
+    // I'll change it to a better loop later.
+    position.getTop = function (elem, isInner) {
+        var result = elem.offsetTop;
+        if (!isInner) {
+            while (elem = elem.offsetParent) {
+                result += elem.offsetTop;
+            }
+        }
+        return result;
+    };
+
+    position.getHeight = function (elem) {
+        return elem.offsetHeight || elem.scrollHeight;
+    };
+
+    position.getWidth = function (elem) {
+        return elem.offsetWidth || elem.scrollWidth;
+    };
+
+    position.getPageSize = function () {
+
+        var scrollWidth, scrollHeight;
+        var innerWidth, innerHeight;
+
+        // It's not very clear which blocks work with which browsers.
+        if (self.innerHeight && self.scrollMaxY) {
+            scrollWidth = doc.body.scrollWidth;
+            scrollHeight = self.innerHeight + self.scrollMaxY;
+        }
+        else if (doc.body.scrollHeight > doc.body.offsetHeight) {
+            scrollWidth = doc.body.scrollWidth;
+            scrollHeight = doc.body.scrollHeight;
+        }
+        else {
+            scrollWidth = doc.body.offsetWidth;
+            scrollHeight = doc.body.offsetHeight;
+        }
+
+        if (self.innerHeight) {
+            // Non-IE browser
+            innerWidth = self.innerWidth;
+            innerHeight = self.innerHeight;
+        }
+        else if (doc.documentElement && doc.documentElement.clientHeight) {
+            // Some versions of IE (IE 6 w/ a DOCTYPE declaration)
+            innerWidth = doc.documentElement.clientWidth;
+            innerHeight = doc.documentElement.clientHeight;
+        }
+        else if (doc.body) {
+            // Other versions of IE
+            innerWidth = doc.body.clientWidth;
+            innerHeight = doc.body.clientHeight;
+        }
+
+        var maxWidth = Math.max(scrollWidth, innerWidth);
+        var maxHeight = Math.max(scrollHeight, innerHeight);
+        return [maxWidth, maxHeight, innerWidth, innerHeight];
+    };
+
+    // Handles pushing and popping TextareaStates for undo/redo commands.
+    // I should rename the stack variables to list.
+    function UndoManager(callback, panels) {
+
+        var undoObj = this;
+        var undoStack = []; // A stack of undo states
+        var stackPtr = 0; // The index of the current state
+        var mode = "none";
+        var lastState; // The last state
+        var timer; // The setTimeout handle for cancelling the timer
+        var inputStateObj;
+
+        // Set the mode for later logic steps.
+        var setMode = function (newMode, noSave) {
+            if (mode != newMode) {
+                mode = newMode;
+                if (!noSave) {
+                    saveState();
+                }
+            }
+
+            if (!uaSniffed.isIE || mode != "moving") {
+                timer = setTimeout(refreshState, 1);
+            }
+            else {
+                inputStateObj = null;
+            }
+        };
+
+        var refreshState = function (isInitialState) {
+            inputStateObj = new TextareaState(panels, isInitialState);
+            timer = undefined;
+        };
+
+        this.setCommandMode = function () {
+            mode = "command";
+            saveState();
+            timer = setTimeout(refreshState, 0);
+        };
+
+        this.canUndo = function () {
+            return stackPtr > 1;
+        };
+
+        this.canRedo = function () {
+            if (undoStack[stackPtr + 1]) {
+                return true;
+            }
+            return false;
+        };
+
+        // Removes the last state and restores it.
+        this.undo = function () {
+
+            if (undoObj.canUndo()) {
+                if (lastState) {
+                    // What about setting state -1 to null or checking for undefined?
+                    lastState.restore();
+                    lastState = null;
+                }
+                else {
+                    undoStack[stackPtr] = new TextareaState(panels);
+                    undoStack[--stackPtr].restore();
+
+                    if (callback) {
+                        callback();
+                    }
+                }
+            }
+
+            mode = "none";
+            panels.input.focus();
+            refreshState();
+        };
+
+        // Redo an action.
+        this.redo = function () {
+
+            if (undoObj.canRedo()) {
+
+                undoStack[++stackPtr].restore();
+
+                if (callback) {
+                    callback();
+                }
+            }
+
+            mode = "none";
+            panels.input.focus();
+            refreshState();
+        };
+
+        // Push the input area state to the stack.
+        var saveState = function () {
+            var currState = inputStateObj || new TextareaState(panels);
+
+            if (!currState) {
+                return false;
+            }
+            if (mode == "moving") {
+                if (!lastState) {
+                    lastState = currState;
+                }
+                return;
+            }
+            if (lastState) {
+                if (undoStack[stackPtr - 1].text != lastState.text) {
+                    undoStack[stackPtr++] = lastState;
+                }
+                lastState = null;
+            }
+            undoStack[stackPtr++] = currState;
+            undoStack[stackPtr + 1] = null;
+            if (callback) {
+                callback();
+            }
+        };
+
+        var handleCtrlYZ = function (event) {
+
+            var handled = false;
+
+            if (event.ctrlKey || event.metaKey) {
+
+                // IE and Opera do not support charCode.
+                var keyCode = event.charCode || event.keyCode;
+                var keyCodeChar = String.fromCharCode(keyCode);
+
+                switch (keyCodeChar) {
+
+                    case "y":
+                        undoObj.redo();
+                        handled = true;
+                        break;
+
+                    case "z":
+                        if (!event.shiftKey) {
+                            undoObj.undo();
+                        }
+                        else {
+                            undoObj.redo();
+                        }
+                        handled = true;
+                        break;
+                }
+            }
+
+            if (handled) {
+                if (event.preventDefault) {
+                    event.preventDefault();
+                }
+                if (window.event) {
+                    window.event.returnValue = false;
+                }
+                return;
+            }
+        };
+
+        // Set the mode depending on what is going on in the input area.
+        var handleModeChange = function (event) {
+
+            if (!event.ctrlKey && !event.metaKey) {
+
+                var keyCode = event.keyCode;
+
+                if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
+                    // 33 - 40: page up/dn and arrow keys
+                    // 63232 - 63235: page up/dn and arrow keys on safari
+                    setMode("moving");
+                }
+                else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
+                    // 8: backspace
+                    // 46: delete
+                    // 127: delete
+                    setMode("deleting");
+                }
+                else if (keyCode == 13) {
+                    // 13: Enter
+                    setMode("newlines");
+                }
+                else if (keyCode == 27) {
+                    // 27: escape
+                    setMode("escape");
+                }
+                else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
+                    // 16-20 are shift, etc.
+                    // 91: left window key
+                    // I think this might be a little messed up since there are
+                    // a lot of nonprinting keys above 20.
+                    setMode("typing");
+                }
+            }
+        };
+
+        var setEventHandlers = function () {
+            util.addEvent(panels.input, "keypress", function (event) {
+                // keyCode 89: y
+                // keyCode 90: z
+                if ((event.ctrlKey || event.metaKey) && (event.keyCode == 89 || event.keyCode == 90)) {
+                    event.preventDefault();
+                }
+            });
+
+            var handlePaste = function () {
+                if (uaSniffed.isIE || (inputStateObj && inputStateObj.text != panels.input.value)) {
+                    if (timer == undefined) {
+                        mode = "paste";
+                        saveState();
+                        refreshState();
+                    }
+                }
+            };
+
+            util.addEvent(panels.input, "keydown", handleCtrlYZ);
+            util.addEvent(panels.input, "keydown", handleModeChange);
+            util.addEvent(panels.input, "mousedown", function () {
+                setMode("moving");
+            });
+
+            panels.input.onpaste = handlePaste;
+            panels.input.ondrop = handlePaste;
+        };
+
+        var init = function () {
+            setEventHandlers();
+            refreshState(true);
+            saveState();
+        };
+
+        init();
+    }
+
+    // end of UndoManager
+
+    // The input textarea state/contents.
+    // This is used to implement undo/redo by the undo manager.
+    function TextareaState(panels, isInitialState) {
+
+        // Aliases
+        var stateObj = this;
+        var inputArea = panels.input;
+        this.init = function () {
+            if (!util.isVisible(inputArea)) {
+                return;
+            }
+            if (!isInitialState && doc.activeElement && doc.activeElement !== inputArea) { // this happens when tabbing out of the input box
+                return;
+            }
+
+            this.setInputAreaSelectionStartEnd();
+            this.scrollTop = inputArea.scrollTop;
+            if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
+                this.text = inputArea.value;
+            }
+
+        }
+
+        // Sets the selected text in the input box after we've performed an
+        // operation.
+        this.setInputAreaSelection = function () {
+
+            if (!util.isVisible(inputArea)) {
+                return;
+            }
+
+            if (inputArea.selectionStart !== undefined && !uaSniffed.isOpera) {
+
+                inputArea.focus();
+                inputArea.selectionStart = stateObj.start;
+                inputArea.selectionEnd = stateObj.end;
+                inputArea.scrollTop = stateObj.scrollTop;
+            }
+            else if (doc.selection) {
+
+                if (doc.activeElement && doc.activeElement !== inputArea) {
+                    return;
+                }
+
+                inputArea.focus();
+                var range = inputArea.createTextRange();
+                range.moveStart("character", -inputArea.value.length);
+                range.moveEnd("character", -inputArea.value.length);
+                range.moveEnd("character", stateObj.end);
+                range.moveStart("character", stateObj.start);
+                range.select();
+            }
+        };
+
+        this.setInputAreaSelectionStartEnd = function () {
+
+            if (!panels.ieCachedRange && (inputArea.selectionStart || inputArea.selectionStart === 0)) {
+
+                stateObj.start = inputArea.selectionStart;
+                stateObj.end = inputArea.selectionEnd;
+            }
+            else if (doc.selection) {
+
+                stateObj.text = util.fixEolChars(inputArea.value);
+
+                // IE loses the selection in the textarea when buttons are
+                // clicked.  On IE we cache the selection. Here, if something is cached,
+                // we take it.
+                var range = panels.ieCachedRange || doc.selection.createRange();
+
+                var fixedRange = util.fixEolChars(range.text);
+                var marker = "\x07";
+                var markedRange = marker + fixedRange + marker;
+                range.text = markedRange;
+                var inputText = util.fixEolChars(inputArea.value);
+
+                range.moveStart("character", -markedRange.length);
+                range.text = fixedRange;
+
+                stateObj.start = inputText.indexOf(marker);
+                stateObj.end = inputText.lastIndexOf(marker) - marker.length;
+
+                var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;
+
+                if (len) {
+                    range.moveStart("character", -fixedRange.length);
+                    while (len--) {
+                        fixedRange += "\n";
+                        stateObj.end += 1;
+                    }
+                    range.text = fixedRange;
+                }
+
+                if (panels.ieCachedRange)
+                    stateObj.scrollTop = panels.ieCachedScrollTop; // this is set alongside with ieCachedRange
+
+                panels.ieCachedRange = null;
+
+                this.setInputAreaSelection();
+            }
+        };
+
+        // Restore this state into the input area.
+        this.restore = function () {
+
+            if (stateObj.text != undefined && stateObj.text != inputArea.value) {
+                inputArea.value = stateObj.text;
+            }
+            this.setInputAreaSelection();
+            inputArea.scrollTop = stateObj.scrollTop;
+        };
+
+        // Gets a collection of HTML chunks from the inptut textarea.
+        this.getChunks = function () {
+
+            var chunk = new Chunks();
+            chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
+            chunk.startTag = "";
+            chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
+            chunk.endTag = "";
+            chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
+            chunk.scrollTop = stateObj.scrollTop;
+
+            return chunk;
+        };
+
+        // Sets the TextareaState properties given a chunk of markdown.
+        this.setChunks = function (chunk) {
+
+            chunk.before = chunk.before + chunk.startTag;
+            chunk.after = chunk.endTag + chunk.after;
+
+            this.start = chunk.before.length;
+            this.end = chunk.before.length + chunk.selection.length;
+            this.text = chunk.before + chunk.selection + chunk.after;
+            this.scrollTop = chunk.scrollTop;
+        };
+        this.init();
+    };
+
+    function PreviewManager(converter, panels, previewRefreshCallback) {
+
+        var managerObj = this;
+        var timeout;
+        var elapsedTime;
+        var oldInputText;
+        var maxDelay = 3000;
+        var startType = "delayed"; // The other legal value is "manual"
+
+        // Adds event listeners to elements
+        var setupEvents = function (inputElem, listener) {
+
+            util.addEvent(inputElem, "input", listener);
+            inputElem.onpaste = listener;
+            inputElem.ondrop = listener;
+
+            util.addEvent(inputElem, "keypress", listener);
+            util.addEvent(inputElem, "keydown", listener);
+        };
+
+        var getDocScrollTop = function () {
+
+            var result = 0;
+
+            if (window.innerHeight) {
+                result = window.pageYOffset;
+            }
+            else
+                if (doc.documentElement && doc.documentElement.scrollTop) {
+                    result = doc.documentElement.scrollTop;
+                }
+                else
+                    if (doc.body) {
+                        result = doc.body.scrollTop;
+                    }
+
+            return result;
+        };
+
+        var makePreviewHtml = function () {
+
+            // If there is no registered preview panel
+            // there is nothing to do.
+            if (!panels.preview)
+                return;
+
+
+            var text = panels.input.value;
+            if (text && text == oldInputText) {
+                return; // Input text hasn't changed.
+            }
+            else {
+                oldInputText = text;
+            }
+
+            var prevTime = new Date().getTime();
+
+            text = converter.makeHtml(text);
+
+            // Calculate the processing time of the HTML creation.
+            // It's used as the delay time in the event listener.
+            var currTime = new Date().getTime();
+            elapsedTime = currTime - prevTime;
+
+            pushPreviewHtml(text);
+        };
+
+        // setTimeout is already used.  Used as an event listener.
+        var applyTimeout = function () {
+
+            if (timeout) {
+                clearTimeout(timeout);
+                timeout = undefined;
+            }
+
+            if (startType !== "manual") {
+
+                var delay = 0;
+
+                if (startType === "delayed") {
+                    delay = elapsedTime;
+                }
+
+                if (delay > maxDelay) {
+                    delay = maxDelay;
+                }
+                timeout = setTimeout(makePreviewHtml, delay);
+            }
+        };
+
+        var getScaleFactor = function (panel) {
+            if (panel.scrollHeight <= panel.clientHeight) {
+                return 1;
+            }
+            return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
+        };
+
+        var setPanelScrollTops = function () {
+            if (panels.preview) {
+                panels.preview.scrollTop = (panels.preview.scrollHeight - panels.preview.clientHeight) * getScaleFactor(panels.preview);
+            }
+        };
+
+        this.refresh = function (requiresRefresh) {
+
+            if (requiresRefresh) {
+                oldInputText = "";
+                makePreviewHtml();
+            }
+            else {
+                applyTimeout();
+            }
+        };
+
+        this.processingTime = function () {
+            return elapsedTime;
+        };
+
+        var isFirstTimeFilled = true;
+
+        // IE doesn't let you use innerHTML if the element is contained somewhere in a table
+        // (which is the case for inline editing) -- in that case, detach the element, set the
+        // value, and reattach. Yes, that *is* ridiculous.
+        var ieSafePreviewSet = function (text) {
+            var preview = panels.preview;
+            var parent = preview.parentNode;
+            var sibling = preview.nextSibling;
+            parent.removeChild(preview);
+            preview.innerHTML = text;
+            if (!sibling)
+                parent.appendChild(preview);
+            else
+                parent.insertBefore(preview, sibling);
+        }
+
+        var nonSuckyBrowserPreviewSet = function (text) {
+            panels.preview.innerHTML = text;
+        }
+
+        var previewSetter;
+
+        var previewSet = function (text) {
+            if (previewSetter)
+                return previewSetter(text);
+
+            try {
+                nonSuckyBrowserPreviewSet(text);
+                previewSetter = nonSuckyBrowserPreviewSet;
+            } catch (e) {
+                previewSetter = ieSafePreviewSet;
+                previewSetter(text);
+            }
+        };
+
+        var pushPreviewHtml = function (text) {
+
+            var emptyTop = position.getTop(panels.input) - getDocScrollTop();
+
+            if (panels.preview) {
+                previewSet(text);
+                previewRefreshCallback();
+            }
+
+            setPanelScrollTops();
+
+            if (isFirstTimeFilled) {
+                isFirstTimeFilled = false;
+                return;
+            }
+
+            var fullTop = position.getTop(panels.input) - getDocScrollTop();
+
+            if (uaSniffed.isIE) {
+                setTimeout(function () {
+                    window.scrollBy(0, fullTop - emptyTop);
+                }, 0);
+            }
+            else {
+                window.scrollBy(0, fullTop - emptyTop);
+            }
+        };
+
+        var init = function () {
+
+            setupEvents(panels.input, applyTimeout);
+            makePreviewHtml();
+
+            if (panels.preview) {
+                panels.preview.scrollTop = 0;
+            }
+        };
+
+        init();
+    };
+
+    // Creates the background behind the hyperlink text entry box.
+    // And download dialog
+    // Most of this has been moved to CSS but the div creation and
+    // browser-specific hacks remain here.
+    ui.createBackground = function () {
+
+        var background = doc.createElement("div"),
+            style = background.style;
+
+        background.className = "wmd-prompt-background";
+
+        style.position = "absolute";
+        style.top = "0";
+
+        style.zIndex = "1000";
+
+        if (uaSniffed.isIE) {
+            style.filter = "alpha(opacity=50)";
+        }
+        else {
+            style.opacity = "0.5";
+        }
+
+        var pageSize = position.getPageSize();
+        style.height = pageSize[1] + "px";
+
+        if (uaSniffed.isIE) {
+            style.left = doc.documentElement.scrollLeft;
+            style.width = doc.documentElement.clientWidth;
+        }
+        else {
+            style.left = "0";
+            style.width = "100%";
+        }
+
+        doc.body.appendChild(background);
+        return background;
+    };
+
+    // This simulates a modal dialog box and asks for the URL when you
+    // click the hyperlink or image buttons.
+    //
+    // text: The html for the input box.
+    // defaultInputText: The default value that appears in the input box.
+    // callback: The function which is executed when the prompt is dismissed, either via OK or Cancel.
+    //      It receives a single argument; either the entered text (if OK was chosen) or null (if Cancel
+    //      was chosen).
+    ui.prompt = function (text, defaultInputText, callback) {
+
+        // These variables need to be declared at this level since they are used
+        // in multiple functions.
+        var dialog;         // The dialog box.
+        var input;         // The text box where you enter the hyperlink.
+
+
+        if (defaultInputText === undefined) {
+            defaultInputText = "";
+        }
+
+        // Used as a keydown event handler. Esc dismisses the prompt.
+        // Key code 27 is ESC.
+        var checkEscape = function (key) {
+            var code = (key.charCode || key.keyCode);
+            if (code === 27) {
+                close(true);
+            }
+        };
+
+        // Dismisses the hyperlink input box.
+        // isCancel is true if we don't care about the input text.
+        // isCancel is false if we are going to keep the text.
+        var close = function (isCancel) {
+            util.removeEvent(doc.body, "keydown", checkEscape);
+            var text = input.value;
+
+            if (isCancel) {
+                text = null;
+            }
+            else {
+                // Fixes common pasting errors.
+                text = text.replace(/^http:\/\/(https?|ftp):\/\//, '$1://');
+                if (!/^(?:https?|ftp):\/\//.test(text))
+                    text = 'http://' + text;
+            }
+
+            dialog.parentNode.removeChild(dialog);
+
+            callback(text);
+            return false;
+        };
+
+
+
+        // Create the text input box form/window.
+        var createDialog = function () {
+
+            // The main dialog box.
+            dialog = doc.createElement("div");
+            dialog.className = "wmd-prompt-dialog";
+            dialog.style.padding = "10px;";
+            dialog.style.position = "fixed";
+            dialog.style.width = "400px";
+            dialog.style.zIndex = "1001";
+
+            // The dialog text.
+            var question = doc.createElement("div");
+            question.innerHTML = text;
+            question.style.padding = "5px";
+            dialog.appendChild(question);
+
+            // The web form container for the text box and buttons.
+            var form = doc.createElement("form"),
+                style = form.style;
+            form.onsubmit = function () { return close(false); };
+            style.padding = "0";
+            style.margin = "0";
+            style.cssFloat = "left";
+            style.width = "100%";
+            style.textAlign = "center";
+            style.position = "relative";
+            dialog.appendChild(form);
+
+            // The input text box
+            input = doc.createElement("input");
+            input.type = "text";
+            input.value = defaultInputText;
+            style = input.style;
+            style.display = "block";
+            style.width = "80%";
+            style.marginLeft = style.marginRight = "auto";
+            form.appendChild(input);
+
+            // The ok button
+            var okButton = doc.createElement("input");
+            okButton.type = "button";
+            okButton.onclick = function () { return close(false); };
+            okButton.value = "OK";
+            style = okButton.style;
+            style.margin = "10px";
+            style.display = "inline";
+            style.width = "7em";
+
+
+            // The cancel button
+            var cancelButton = doc.createElement("input");
+            cancelButton.type = "button";
+            cancelButton.onclick = function () { return close(true); };
+            cancelButton.value = "Cancel";
+            style = cancelButton.style;
+            style.margin = "10px";
+            style.display = "inline";
+            style.width = "7em";
+
+            form.appendChild(okButton);
+            form.appendChild(cancelButton);
+
+            util.addEvent(doc.body, "keydown", checkEscape);
+            dialog.style.top = "50%";
+            dialog.style.left = "50%";
+            dialog.style.display = "block";
+            if (uaSniffed.isIE_5or6) {
+                dialog.style.position = "absolute";
+                dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
+                dialog.style.left = "50%";
+            }
+            doc.body.appendChild(dialog);
+
+            // This has to be done AFTER adding the dialog to the form if you
+            // want it to be centered.
+            dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
+            dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";
+
+        };
+
+        // Why is this in a zero-length timeout?
+        // Is it working around a browser bug?
+        setTimeout(function () {
+
+            createDialog();
+
+            var defTextLen = defaultInputText.length;
+            if (input.selectionStart !== undefined) {
+                input.selectionStart = 0;
+                input.selectionEnd = defTextLen;
+            }
+            else if (input.createTextRange) {
+                var range = input.createTextRange();
+                range.collapse(false);
+                range.moveStart("character", -defTextLen);
+                range.moveEnd("character", defTextLen);
+                range.select();
+            }
+
+            input.focus();
+        }, 0);
+    };
+
+    function UIManager(postfix, panels, undoManager, previewManager, commandManager, helpOptions) {
+
+        var inputBox = panels.input,
+            buttons = {}; // buttons.undo, buttons.link, etc. The actual DOM elements.
+
+        makeSpritedButtonRow();
+
+        var keyEvent = "keydown";
+        if (uaSniffed.isOpera) {
+            keyEvent = "keypress";
+        }
+
+        util.addEvent(inputBox, keyEvent, function (key) {
+
+            // Check to see if we have a button key and, if so execute the callback.
+            if ((key.ctrlKey || key.metaKey) && !key.altKey && !key.shiftKey) {
+
+                var keyCode = key.charCode || key.keyCode;
+                var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();
+
+                switch (keyCodeStr) {
+                    case "b":
+                        doClick(buttons.bold);
+                        break;
+                    case "i":
+                        doClick(buttons.italic);
+                        break;
+                    case "l":
+                        doClick(buttons.link);
+                        break;
+                    case "q":
+                        doClick(buttons.quote);
+                        break;
+                    case "k":
+                        doClick(buttons.code);
+                        break;
+                    case "g":
+                        doClick(buttons.image);
+                        break;
+                    case "o":
+                        doClick(buttons.olist);
+                        break;
+                    case "u":
+                        doClick(buttons.ulist);
+                        break;
+                    case "h":
+                        doClick(buttons.heading);
+                        break;
+                    case "r":
+                        doClick(buttons.hr);
+                        break;
+                    case "y":
+                        doClick(buttons.redo);
+                        break;
+                    case "z":
+                        if (key.shiftKey) {
+                            doClick(buttons.redo);
+                        }
+                        else {
+                            doClick(buttons.undo);
+                        }
+                        break;
+                    default:
+                        return;
+                }
+
+
+                if (key.preventDefault) {
+                    key.preventDefault();
+                }
+
+                if (window.event) {
+                    window.event.returnValue = false;
+                }
+            }
+        });
+
+        // Auto-indent on shift-enter
+        util.addEvent(inputBox, "keyup", function (key) {
+            if (key.shiftKey && !key.ctrlKey && !key.metaKey) {
+                var keyCode = key.charCode || key.keyCode;
+                // Character 13 is Enter
+                if (keyCode === 13) {
+                    var fakeButton = {};
+                    fakeButton.textOp = bindCommand("doAutoindent");
+                    doClick(fakeButton);
+                }
+            }
+        });
+
+        // special handler because IE clears the context of the textbox on ESC
+        if (uaSniffed.isIE) {
+            util.addEvent(inputBox, "keydown", function (key) {
+                var code = key.keyCode;
+                if (code === 27) {
+                    return false;
+                }
+            });
+        }
+
+
+        // Perform the button's action.
+        function doClick(button) {
+
+            inputBox.focus();
+
+            if (button.textOp) {
+
+                if (undoManager) {
+                    undoManager.setCommandMode();
+                }
+
+                var state = new TextareaState(panels);
+
+                if (!state) {
+                    return;
+                }
+
+                var chunks = state.getChunks();
+
+                // Some commands launch a "modal" prompt dialog.  Javascript
+                // can't really make a modal dialog box and the WMD code
+                // will continue to execute while the dialog is displayed.
+                // This prevents the dialog pattern I'm used to and means
+                // I can't do something like this:
+                //
+                // var link = CreateLinkDialog();
+                // makeMarkdownLink(link);
+                //
+                // Instead of this straightforward method of handling a
+                // dialog I have to pass any code which would execute
+                // after the dialog is dismissed (e.g. link creation)
+                // in a function parameter.
+                //
+                // Yes this is awkward and I think it sucks, but there's
+                // no real workaround.  Only the image and link code
+                // create dialogs and require the function pointers.
+                var fixupInputArea = function () {
+
+                    inputBox.focus();
+
+                    if (chunks) {
+                        state.setChunks(chunks);
+                    }
+
+                    state.restore();
+                    previewManager.refresh();
+                };
+
+                var noCleanup = button.textOp(chunks, fixupInputArea);
+
+                if (!noCleanup) {
+                    fixupInputArea();
+                }
+
+            }
+
+            if (button.execute) {
+                button.execute(undoManager);
+            }
+        };
+
+        function setupButton(button, isEnabled) {
+
+            var normalYShift = "0px";
+            var disabledYShift = "-20px";
+            var highlightYShift = "-40px";
+            var image = button.getElementsByTagName("span")[0];
+            if (isEnabled) {
+                image.style.backgroundPosition = button.XShift + " " + normalYShift;
+                button.onmouseover = function () {
+                    image.style.backgroundPosition = this.XShift + " " + highlightYShift;
+                };
+
+                button.onmouseout = function () {
+                    image.style.backgroundPosition = this.XShift + " " + normalYShift;
+                };
+
+                // IE tries to select the background image "button" text (it's
+                // implemented in a list item) so we have to cache the selection
+                // on mousedown.
+                if (uaSniffed.isIE) {
+                    button.onmousedown = function () {
+                        if (doc.activeElement && doc.activeElement !== panels.input) { // we're not even in the input box, so there's no selection
+                            return;
+                        }
+                        panels.ieCachedRange = document.selection.createRange();
+                        panels.ieCachedScrollTop = panels.input.scrollTop;
+                    };
+                }
+
+                if (!button.isHelp) {
+                    button.onclick = function () {
+                        if (this.onmouseout) {
+                            this.onmouseout();
+                        }
+                        doClick(this);
+                        return false;
+                    }
+                }
+            }
+            else {
+                image.style.backgroundPosition = button.XShift + " " + disabledYShift;
+                button.onmouseover = button.onmouseout = button.onclick = function () { };
+            }
+        }
+
+        function bindCommand(method) {
+            if (typeof method === "string")
+                method = commandManager[method];
+            return function () { method.apply(commandManager, arguments); }
+        }
+
+        function makeSpritedButtonRow() {
+
+            var buttonBar = panels.buttonBar;
+
+            var normalYShift = "0px";
+            var disabledYShift = "-20px";
+            var highlightYShift = "-40px";
+
+            var buttonRow = document.createElement("ul");
+            buttonRow.id = "wmd-button-row" + postfix;
+            buttonRow.className = 'wmd-button-row';
+            buttonRow = buttonBar.appendChild(buttonRow);
+            var xPosition = 0;
+            var makeButton = function (id, title, XShift, textOp) {
+                var button = document.createElement("li");
+                button.className = "wmd-button";
+                button.style.left = xPosition + "px";
+                xPosition += 25;
+                var buttonImage = document.createElement("span");
+                button.id = id + postfix;
+                button.appendChild(buttonImage);
+                button.title = title;
+                button.XShift = XShift;
+                if (textOp)
+                    button.textOp = textOp;
+                setupButton(button, true);
+                buttonRow.appendChild(button);
+                return button;
+            };
+            var makeSpacer = function (num) {
+                var spacer = document.createElement("li");
+                spacer.className = "wmd-spacer wmd-spacer" + num;
+                spacer.id = "wmd-spacer" + num + postfix;
+                buttonRow.appendChild(spacer);
+                xPosition += 25;
+            }
+
+            buttons.bold = makeButton("wmd-bold-button", "Strong  Ctrl+B", "0px", bindCommand("doBold"));
+            buttons.italic = makeButton("wmd-italic-button", "Emphasis  Ctrl+I", "-20px", bindCommand("doItalic"));
+            makeSpacer(1);
+            buttons.link = makeButton("wmd-link-button", "Hyperlink  Ctrl+L", "-40px", bindCommand(function (chunk, postProcessing) {
+                return this.doLinkOrImage(chunk, postProcessing, false);
+            }));
+            buttons.quote = makeButton("wmd-quote-button", "Blockquote 
     Ctrl+Q", "-60px", bindCommand("doBlockquote"));
+            buttons.code = makeButton("wmd-code-button", "Code Sample 
     Ctrl+K", "-80px", bindCommand("doCode"));
+            buttons.image = makeButton("wmd-image-button", "Image  Ctrl+G", "-100px", bindCommand(function (chunk, postProcessing) {
+                return this.doLinkOrImage(chunk, postProcessing, true);
+            }));
+            makeSpacer(2);
+            buttons.olist = makeButton("wmd-olist-button", "Numbered List 
       Ctrl+O", "-120px", bindCommand(function (chunk, postProcessing) {
+                this.doList(chunk, postProcessing, true);
+            }));
+            buttons.ulist = makeButton("wmd-ulist-button", "Bulleted List