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markdown_extra.nu
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markdown_extra.nu
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; Nu MarkdownExtra
; Copyright (c) 2007 Grayson Hansard
; <http://www.fromconcentratesoftware.com/>
;
; PHP Markdown & Extra
; Copyright (c) 2004-2007 Michel Fortin
; <http://www.michelf.com/projects/php-markdown/>
;
; Original Markdown
; Copyright (c) 2004-2006 John Gruber
; <http://daringfireball.net/projects/markdown/>
; March 11, 2008
; Implements header ids.
; Still needs to implement span parsing for table cells
; Also has a bug in which the ending paragraph tag for a definition list may be inserted behind the next element
(load "markdown")
(function markdown_DoHeaders (str)
(set str (NSMutableString stringWithString:str))
((/
(^.+?) # $1: Header text
(?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? # $2: Id attribute
[ ]*\n(=+|-+)[ ]*\n+ # $3: Header footer
/mx findAllInString:str) eachInReverse:(do (m)
(set level 1)
(if ((m groupAtIndex:3) hasPrefix:"-") (set level 2))
(set attrs "")
(if (m groupAtIndex:2) (set attrs " id=\"#{(m groupAtIndex:2)}\""))
(str replaceCharactersInRange:(m range) withString:"<h#{level}#{attrs}>#{(markdown_RunSpanGamut (m groupAtIndex:1))}</h#{level}>\n\n")))
(set hack -"\#") ; Having a literal -"#" in the string makes Nu think that it should be evaluating something.
(((eregex <<-END
^(#{hack}{1,6}) # $1 = string of #'s
[ \t]*
(.+?) # $2 = Header text
[ \t]*
\#* # optional closing #'s (not counted)
(?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? # $3 id attribute
[ \t]*
\n+END "mx") findAllInString:str) eachInReverse:
(do (m)
(set attrs "")
(if (m groupAtIndex:3) (set attrs " id=\"#{(m groupAtIndex:3)}\""))
(str replaceCharactersInRange:(m range)
withString:"<h#{((m groupAtIndex:1) length)}#{attrs}>#{(markdown_RunSpanGamut (m groupAtIndex:2))}</h#{((m groupAtIndex:1) length)}>\n\n")))
str)
(function mdextra_StripFootnotes (str)
(set str (NSMutableString stringWithString:str))
((/^[ ]{0,4}\[\^(.+?)\][ ]?: # note_id = $1
[ ]*
\n? # maybe *one* newline
( # text = $2 (no blank lines allowed)
(?:
.+ # actual text
|
\n # newlines but
(?!\[\^.+?\]:\s)# negative lookahead for footnote marker.
(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
# by non-indented content
)*
)/xm findAllInString:str) eachInReverse:(do (m)
($g_footnotes setObject:(markdown_Outdent (m groupAtIndex:2)) forKey:(m groupAtIndex:1))
(str replaceCharactersInRange:(m range) withString:"")))
(str)
)
(function mdextra_StripAbbreviations (str)
(set str (NSMutableString stringWithString:str))
((/
^[ ]{0,4}\*\[(.+?)\][ ]?: # abbr_id = $1
(.*) # text = $2 (no blank lines allowed)
/mx findAllInString:str) eachInReverse:(do (m)
($g_abbr_descriptions setObject:((m groupAtIndex:2) strip) forKey:(m groupAtIndex:1))
(str replaceCharactersInRange:(m range) withString:"")))
(str))
(function mdextra_AppendFootnotes (str)
(if (!= (($g_footnotes allKeys) count) 0)
(set tmp (NSMutableString stringWithString:str))
(tmp appendString:"\n\n<div class=\"footnotes\">\n<hr />\n<ol>\n\n")
(set num 0)
(($g_footnotes allKeys) each:(do (k)
(set num (+ num 1))
(set footnote ($g_footnotes objectForKey:k))
(set footnote (mdextra_RunBlockGamut (+ footnote "\n")))
(set backlink ("<a href=\"#fnref:#{k}\" rev=\"footnote\">↩</a>"))
(if (/<\/p>$/ findInString:footnote) (set footnote "#{(footnote substringToIndex:(- (footnote length) 4))} #{backlink}</p>")
(else (set footnote "#{footnote}\n\n<p>#{backlink}</p>")))
(tmp appendString:"<li id=\"fn:#{k}\">\n")
(tmp appendString:footnote)
(tmp appendString:"\n</li>\n\n")
; Replace an fn link
(tmp replaceCharactersInRange:(tmp rangeOfString:"!!fn:#{k}!!") withString:"<sup id=\"fnref:#{k}\"><a href=\"#fn:#{k}\" rel=\"footnote\">#{num}</a></sup>")))
(tmp appendString:"</ol>\n</div>")
(tmp)
(else (str))))
(function mdextra_DoTables (str)
(set str (NSMutableString stringWithString:str))
((/^ # Start of a line
[ ]{0,4} # Allowed whitespace.
[|] # Optional leading pipe (present)
(.+) \n # $1: Header row (at least one pipe)
[ ]{0,4} # Allowed whitespace.
[|] ([ ]*[-:]+[-| :]*) \n # $2: Header underline
( # $3: Cells
(?>
[ ]* # Allowed whitespace.
[|] .* \n # Row content.
)*
)
(?=\n|\Z) # Stop at final double newline.
/mx findAllInString:str) eachInReverse:(do (m)
(set hed (m groupAtIndex:1))
(set underline (m groupAtIndex:2))
(set content (m groupAtIndex:3))
(set content (/^ *[|]/m replaceWithString:"" inString:content))
(str replaceCharactersInRange:(m range) withString:(mdextra_DoTableCallback (array (m groupAtIndex:0) hed underline content)))
))
(str))
(function mdextra_DoTableCallback (arr)
(set hed (arr objectAtIndex:1))
(set underline (arr objectAtIndex:2))
(set content (arr objectAtIndex:3))
(set hed (/[|] *$/m replaceWithString:"" inString:hed))
(set underline (/[|] *$/m replaceWithString:"" inString:underline))
(set content (/[|] *$/m replaceWithString:"" inString:content))
(set n 0)
(set attr (dict))
(((NuRegex regexWithPattern:" *[|] *") splitString:underline) each: (do (s)
(if ((/^ *-+: *$/ findAllInString:s) count) (attr setObject:" align=\"right\"" forKey:n)
(else (if ((/^ *:-+: *$/ findAllInString:s) count) (attr setObject:" align=\"center\"" forKey:n)
(else (if ((/^ *:-+ *$/ findAllInString:s) count) (attr setObject:" align=\"left\"" forKey:n)
(else (attr setObject:"" forKey:n)))))))
(set n (+ n 1))))
; # Parsing span elements, including code spans, character escapes,
; # and inline HTML tags, so that pipes inside those gets ignored.
; $head = $this->parseSpan($head);
(set headers ((NuRegex regexWithPattern:" *[|] *") splitString:hed))
(set col_count (headers count))
(set text (NSMutableString string))
(text appendString:"<table>\n<thead>\n<tr>\n")
(set n 0)
(headers each:(do (header)
(text appendString:" <th#{(attr objectForKey:n)}>#{(markdown_RunSpanGamut (header strip))}</th>\n")
(set n (+ n 1))
))
(text appendString:"</tr>\n</thead>\n")
; # Split content by row.
(set rows ((content chomp) componentsSeparatedByString:"\n"))
(text appendString:"<tbody>\n")
(rows each:(do (row)
; # Parsing span elements, including code spans, character escapes,
; # and inline HTML tags, so that pipes inside those gets ignored.
; $row = $this->parseSpan($row);
; # Split row by cell.
(set row_cells ((NuRegex regexWithPattern:" *[|] *") splitString:row limit:col_count))
(set row_cells (mdextra_arraypad row_cells col_count ""))
(text appendString:"<tr>\n")
(set n 0)
(row_cells each:(do (cell)
(text appendString:" <td#{(attr objectForKey:n)}>#{(markdown_RunSpanGamut (cell strip))}</td>\n")
(set n (+ n 1))))
(text appendString:"</tr>\n")
))
(text appendString:"</tbody>\n</table>")
(+ (mdextra_hashPart text) "\n")
)
(function mdextra_arraypad (arr count pad)
(set delta (- count (arr count)))
(if (!= 0 delta)
(set arr (NSMutableArray arrayWithArray:arr))
(delta times:(do (d) (arr addObject:pad))))
(arr))
(function mdextra_DoDefLists (str)
(set str (NSMutableString stringWithString:str))
((/(?:(?<=\n\n)|\A\n?)
(?>
( # $1 = whole list
( # $2
[ ]{0,4}
((?>.*\S.*\n)+) # $3 = defined term
\n?
[ ]{0,4}:[ ]+ # colon starting definition
)
(?s:.+?)
( # $4
\z
|
\n{2,}
(?=\S)
(?! # Negative lookahead for another term
[ ]{0,4}
(?: \S.*\n )+? # defined term
\n?
[ ]{0,4}:[ ]+ # colon starting definition
)
(?! # Negative lookahead for another definition
[ ]{0,4}:[ ]+ # colon starting definition
)
)
)
)/mx findAllInString:str) each:(do (m)
(set lst (m groupAtIndex:1))
(set result "<dl>#{(mdextra_ProcessDefListItems lst)}</dl>")
(set result (mdextra_hashPart ("<dl>\n#{(mdextra_ProcessDefListItems lst)}</dl>" chomp)))
(str replaceCharactersInRange:(m range) withString:result)
))
(str))
(function mdextra_ProcessDefListItems (str)
(set str (/\n{2,}\z/ replaceWithString:"\n" inString:str))
; Do DTs
(set str (NSMutableString stringWithString:str))
((/(?:\n\n+|\A\n?) # leading line
( # definition terms = $1
[ ]{0,3} # leading whitespace
(?![:][ ]|[ ]) # negative lookahead for a definition
# mark (colon) or more whitespace.
(?: \S.* \n)+? # actual term (not whitespace).
)
(?=\n?[ ]{0,3}:[ ]) # lookahead for following line feed
# with a definition mark.
/mx findAllInString:str) eachInReverse:(do (m)
(set terms (((m groupAtIndex:1) chomp) componentsSeparatedByString:"\n"))
(set txt (NSMutableString string))
(terms each:(do (term) (txt appendString:"\n<dt>#{(markdown_RunSpanGamut term)}</dt>")))
(txt appendString:"\n")
(str replaceCharactersInRange:(m range) withString:txt)))
;; Do DDs
((/ \n(\n+)? # leading line = $1
[ ]{0,4} # whitespace before colon
[:][ ]+ # definition mark (colon)
((?s:.+?)) # definition text = $2
(?= \n+ # stop at next definition mark,
(?: # next term or end of text
[ ]{0,4} [:][ ] |
<dt> | \z
)
)/mx findAllInString:str) eachInReverse:(do (m)
(set leading_line (m groupAtIndex:1))
(set deff (m groupAtIndex:2))
(if (or (leading_line) (/\n{2,}/ findInString:deff))
(set deff "#{(markdown_outdent (mdextra_RunBlockGamut deff))}")
else (set deff (markdown_runSpanGamut (markdown_outdent (deff chomp)))))
(str replaceCharactersInRange:(m range) withString:"\n<dd>#{deff}</dd>\n")
))
(str)
)
(function mdextra_DoFootnotes (str)
(set str (NSMutableString stringWithString:str))
((/\[\^(.+?)\]/ findAllInString:str) eachInReverse:(do (m)
(str replaceCharactersInRange:(m range) withString:"!!fn:#{(m groupAtIndex:1)}!!")))
(str)
)
(function mdextra_DoAbbreviations (str)
(set str (NSMutableString stringWithString:str))
(($g_abbr_descriptions allKeys) each:(do (key)
(set desc ($g_abbr_descriptions objectForKey:key))
(((NuRegex regexWithPattern:"\\b#{key}\\b") findAllInString:(str)) each:(do (m)
(if (desc) (str replaceCharactersInRange:(m range) withString:(mdextra_hashPart "<abbr title=\"#{desc}\">#{key}</abbr>"))
(else (str replaceCharactersInRange:(m range) withString:(mdextra_hashPart "<abbr>#{key}</abbr>"))))
))
))
(str)
)
(function mdextra_hashPart (str)
(set hash "!!#{(str hash)}!!")
($g_html_blocks setObject:str forKey:hash)
hash)
(function mdextra_unhash (str)
(set str (NSMutableString stringWithString:str))
(($g_html_blocks allKeys) eachInReverse:(do (key)
(set r (str rangeOfString:key))
(if (!= (eval (tail r)) 0) (str replaceCharactersInRange:r withString:($g_html_blocks objectForKey:key)))
))
(str))
(function markdown_RunSpanGamut (str)
(set str (markdown_DoCodeSpans str))
(set str (markdown_EscapeSpecialChars str))
(set str (mdextra_DoFootnotes str))
(set str (markdown_DoImages str))
(set str (markdown_DoAnchors str))
(set str (markdown_DoAutoLinks str))
(set str (markdown_EncodeAmpsAndAngles str))
(set str (markdown_DoItalicsAndBold str))
(set str ((regex -" {2,}\n") replaceWithString:"<br />\n" inString:str)) ; Do hard breaks
(set str (mdextra_DoAbbreviations str))
str)
(function mdextra_RunBlockGamut (str)
(set str (markdown_DoHeaders str))
(set str (mdextra_DoTables str))
(set str (/^[ ]{0,2}([ ]?(\*| [-_])[ ]?){3,}[ \t]*$/mx replaceWithString:"\n<hr />\n" inString:str)); Do horizontal rules
(set str (markdown_DoLists str))
(set str (markdown_DoCodeBlocks str))
(set str (mdextra_DoDefLists str))
(set str (markdown_DoBlockQuotes str))
; 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
; <p> tags around block-level tags.
(set str (markdown_HashHTMLBlocks str))
(set str (markdown_FormParagraphs str))
(str))
(function mdextra_RunDocumentGamut (str)
(set str (mdextra_StripFootnotes str))
(set str (markdown_StripLinkDefinitions str))
(set str (mdextra_StripAbbreviations str))
(set str (mdextra_RunBlockGamut str))
(set str (mdextra_AppendFootnotes str))
(set str (mdextra_unhash str))
(str))
(function Markdown (str)
(set $g_urls (dict))
(set $g_titles (dict))
(set $g_html_blocks (dict))
(set $g_escape_table (dict))
(set $g_footnotes (dict))
(set $g_abbr_descriptions (dict))
(-"\`*_{}[]()>#+-.!" each: (do (c) ($g_escape_table setObject:"!!#{(c hash)}!!" forKey:c)))
(set $g_nested_brackets -"(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[(?>[^\[\]]+|\[\])*\])*\])*\])*\])*\])*")
;; From running from Markdown.php
(set $g_list_level 0)
;; Standardize line endings
(set str (/\r\n/ replaceWithString:"\n" inString:str)) ; Convert DOS to Unix
(set str (/\r/ replaceWithString:"\n" inString:str)) ; Convert Mac to Unix
;; Make sure text ends with a couple of newlines
(str appendString:"\n\n")
;; Convert tabs into 4 spaces
(set str (markdown_Detab str))
;; Strip any lines consisting only of spaces and tabs.
(set str (/^[ \t]+$/m replaceWithString:"" inString:str))
;; Turn block-level HTML blocks into hash entries
(set str (markdown_HashHTMLBlocks str))
;; Strip link definitions, store in hashes.
(set str (mdextra_RunDocumentGamut str))
(set str (markdown_UnescapeSpecialChars str))
(str appendCharacter:'\n')
str)