#!/usr/bin/env python version = "1.6b" version_info = (1,6,2,"rc-2") __revision__ = "$Rev$" """ Python-Markdown =============== Converts Markdown to HTML. Basic usage as a module: import markdown md = Markdown() html = md.convert(your_text_string) See http://www.freewisdom.org/projects/python-markdown/ for more information and instructions on how to extend the functionality of the script. (You might want to read that before you try modifying this file.) Started by [Manfred Stienstra](http://www.dwerg.net/). Continued and maintained by [Yuri Takhteyev](http://www.freewisdom.org). Contact: yuri [at] freewisdom.org License: GPL 2 (http://www.gnu.org/copyleft/gpl.html) or BSD """ import re, sys, os, random, codecs # Set debug level: 3 none, 2 critical, 1 informative, 0 all (VERBOSE, INFO, CRITICAL, NONE) = range(4) MESSAGE_THRESHOLD = CRITICAL def message(level, text) : if level >= MESSAGE_THRESHOLD : print text # --------------- CONSTANTS YOU MIGHT WANT TO MODIFY ----------------- TAB_LENGTH = 4 # expand tabs to this many spaces ENABLE_ATTRIBUTES = True # @id = xyz -> <... id="xyz"> SMART_EMPHASIS = 1 # this_or_that does not become thisorthat HTML_REMOVED_TEXT = "[HTML_REMOVED]" # text used instead of HTML in safe mode RTL_BIDI_RANGES = ( (u'\u0590', u'\u07FF'), # from Hebrew to Nko (includes Arabic, Syriac and Thaana) (u'\u2D30', u'\u2D7F'), # Tifinagh ) # Unicode Reference Table: # 0590-05FF - Hebrew # 0600-06FF - Arabic # 0700-074F - Syriac # 0750-077F - Arabic Supplement # 0780-07BF - Thaana # 07C0-07FF - Nko BOMS = { 'utf-8' : (codecs.BOM_UTF8, ), 'utf-16' : (codecs.BOM_UTF16_LE, codecs.BOM_UTF16_BE), #'utf-32' : (codecs.BOM_UTF32_LE, codecs.BOM_UTF32_BE) } def removeBOM(text, encoding): convert = isinstance(text, unicode) for bom in BOMS[encoding]: bom = convert and bom.decode(encoding) or bom if text.startswith(bom): return text.lstrip(bom) return text # The following constant specifies the name used in the usage # statement displayed for python versions lower than 2.3. (With # python2.3 and higher the usage statement is generated by optparse # and uses the actual name of the executable called.) EXECUTABLE_NAME_FOR_USAGE = "python markdown.py" # --------------- CONSTANTS YOU _SHOULD NOT_ HAVE TO CHANGE ---------- # a template for html placeholders HTML_PLACEHOLDER_PREFIX = "qaodmasdkwaspemas" HTML_PLACEHOLDER = HTML_PLACEHOLDER_PREFIX + "%dajkqlsmdqpakldnzsdfls" BLOCK_LEVEL_ELEMENTS = ['p', 'div', 'blockquote', 'pre', 'table', 'dl', 'ol', 'ul', 'script', 'noscript', 'form', 'fieldset', 'iframe', 'math', 'ins', 'del', 'hr', 'hr/', 'style'] def is_block_level (tag) : return ( (tag in BLOCK_LEVEL_ELEMENTS) or (tag[0] == 'h' and tag[1] in "0123456789") ) """ ====================================================================== ========================== NANODOM =================================== ====================================================================== The three classes below implement some of the most basic DOM methods. I use this instead of minidom because I need a simpler functionality and do not want to require additional libraries. Importantly, NanoDom does not do normalization, which is what we want. It also adds extra white space when converting DOM to string """ ENTITY_NORMALIZATION_EXPRESSIONS = [ (re.compile("&"), "&"), (re.compile("<"), "<"), (re.compile(">"), ">"), (re.compile("\""), """)] ENTITY_NORMALIZATION_EXPRESSIONS_SOFT = [ (re.compile("&(?!\#)"), "&"), (re.compile("<"), "<"), (re.compile(">"), ">"), (re.compile("\""), """)] def getBidiType(text) : if not text : return None ch = text[0] if not isinstance(ch, unicode) or not ch.isalpha(): return None else : for min, max in RTL_BIDI_RANGES : if ( ch >= min and ch <= max ) : return "rtl" else : return "ltr" class Document : def __init__ (self) : self.bidi = "ltr" def appendChild(self, child) : self.documentElement = child child.isDocumentElement = True child.parent = self self.entities = {} def setBidi(self, bidi) : if bidi : self.bidi = bidi def createElement(self, tag, textNode=None) : el = Element(tag) el.doc = self if textNode : el.appendChild(self.createTextNode(textNode)) return el def createTextNode(self, text) : node = TextNode(text) node.doc = self return node def createEntityReference(self, entity): if entity not in self.entities: self.entities[entity] = EntityReference(entity) return self.entities[entity] def createCDATA(self, text) : node = CDATA(text) node.doc = self return node def toxml (self) : return self.documentElement.toxml() def normalizeEntities(self, text, avoidDoubleNormalizing=False) : if avoidDoubleNormalizing : regexps = ENTITY_NORMALIZATION_EXPRESSIONS_SOFT else : regexps = ENTITY_NORMALIZATION_EXPRESSIONS for regexp, substitution in regexps : text = regexp.sub(substitution, text) return text def find(self, test) : return self.documentElement.find(test) def unlink(self) : self.documentElement.unlink() self.documentElement = None class CDATA : type = "cdata" def __init__ (self, text) : self.text = text def handleAttributes(self) : pass def toxml (self) : return "" class Element : type = "element" def __init__ (self, tag) : self.nodeName = tag self.attributes = [] self.attribute_values = {} self.childNodes = [] self.bidi = None self.isDocumentElement = False def setBidi(self, bidi) : if bidi : orig_bidi = self.bidi if not self.bidi or self.isDocumentElement: # Once the bidi is set don't change it (except for doc element) self.bidi = bidi self.parent.setBidi(bidi) def unlink(self) : for child in self.childNodes : if child.type == "element" : child.unlink() self.childNodes = None def setAttribute(self, attr, value) : if not attr in self.attributes : self.attributes.append(attr) self.attribute_values[attr] = value def insertChild(self, position, child) : self.childNodes.insert(position, child) child.parent = self def removeChild(self, child) : self.childNodes.remove(child) def replaceChild(self, oldChild, newChild) : position = self.childNodes.index(oldChild) self.removeChild(oldChild) self.insertChild(position, newChild) def appendChild(self, child) : self.childNodes.append(child) child.parent = self def handleAttributes(self) : pass def find(self, test, depth=0) : """ Returns a list of descendants that pass the test function """ matched_nodes = [] for child in self.childNodes : if test(child) : matched_nodes.append(child) if child.type == "element" : matched_nodes += child.find(test, depth+1) return matched_nodes def toxml(self): if ENABLE_ATTRIBUTES : for child in self.childNodes: child.handleAttributes() buffer = "" if self.nodeName in ['h1', 'h2', 'h3', 'h4'] : buffer += "\n" elif self.nodeName in ['li'] : buffer += "\n " # Process children FIRST, then do the attributes childBuffer = "" if self.childNodes or self.nodeName in ['blockquote']: childBuffer += ">" for child in self.childNodes : childBuffer += child.toxml() if self.nodeName == 'p' : childBuffer += "\n" elif self.nodeName == 'li' : childBuffer += "\n " childBuffer += "" % self.nodeName else : childBuffer += "/>" buffer += "<" + self.nodeName if self.nodeName in ['p', 'li', 'ul', 'ol', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6'] : if not self.attribute_values.has_key("dir"): if self.bidi : bidi = self.bidi else : bidi = self.doc.bidi if bidi=="rtl" : self.setAttribute("dir", "rtl") for attr in self.attributes : value = self.attribute_values[attr] value = self.doc.normalizeEntities(value, avoidDoubleNormalizing=True) buffer += ' %s="%s"' % (attr, value) # Now let's actually append the children buffer += childBuffer if self.nodeName in ['p', 'br ', 'li', 'ul', 'ol', 'h1', 'h2', 'h3', 'h4'] : buffer += "\n" return buffer class TextNode : type = "text" attrRegExp = re.compile(r'\{@([^\}]*)=([^\}]*)}') # {@id=123} def __init__ (self, text) : self.value = text def attributeCallback(self, match) : self.parent.setAttribute(match.group(1), match.group(2)) def handleAttributes(self) : self.value = self.attrRegExp.sub(self.attributeCallback, self.value) def toxml(self) : text = self.value self.parent.setBidi(getBidiType(text)) if not text.startswith(HTML_PLACEHOLDER_PREFIX): if self.parent.nodeName == "p" : text = text.replace("\n", "\n ") elif (self.parent.nodeName == "li" and self.parent.childNodes[0]==self): text = "\n " + text.replace("\n", "\n ") text = self.doc.normalizeEntities(text) return text class EntityReference: type = "entity_ref" def __init__(self, entity): self.entity = entity def handleAttributes(self): pass def toxml(self): return "&" + self.entity + ";" """ ====================================================================== ========================== PRE-PROCESSORS ============================ ====================================================================== Preprocessors munge source text before we start doing anything too complicated. Each preprocessor implements a "run" method that takes a pointer to a list of lines of the document, modifies it as necessary and returns either the same pointer or a pointer to a new list. Preprocessors must extend markdown.Preprocessor. """ class Preprocessor : pass class HeaderPreprocessor (Preprocessor): """ Replaces underlined headers with hashed headers to avoid the nead for lookahead later. """ def run (self, lines) : i = -1 while i+1 < len(lines) : i = i+1 if not lines[i].strip() : continue if lines[i].startswith("#") : lines.insert(i+1, "\n") if (i+1 <= len(lines) and lines[i+1] and lines[i+1][0] in ['-', '=']) : underline = lines[i+1].strip() if underline == "="*len(underline) : lines[i] = "# " + lines[i].strip() lines[i+1] = "" elif underline == "-"*len(underline) : lines[i] = "## " + lines[i].strip() lines[i+1] = "" return lines HEADER_PREPROCESSOR = HeaderPreprocessor() class LinePreprocessor (Preprocessor): """Deals with HR lines (needs to be done before processing lists)""" blockquote_re = re.compile(r'^(> )+') def run (self, lines) : for i in range(len(lines)) : prefix = '' m = self.blockquote_re.search(lines[i]) if m : prefix = m.group(0) if self._isLine(lines[i][len(prefix):]) : lines[i] = prefix + self.stash.store("
", safe=True) return lines def _isLine(self, block) : """Determines if a block should be replaced with an <:wHR>""" if block.startswith(" ") : return 0 # a code block text = "".join([x for x in block if not x.isspace()]) if len(text) <= 2 : return 0 for pattern in ['isline1', 'isline2', 'isline3'] : m = RE.regExp[pattern].match(text) if (m and m.group(1)) : return 1 else: return 0 LINE_PREPROCESSOR = LinePreprocessor() class HtmlBlockPreprocessor (Preprocessor): """Removes html blocks from self.lines""" def _get_left_tag(self, block): return block[1:].replace(">", " ", 1).split()[0].lower() def _get_right_tag(self, left_tag, block): return block.rstrip()[-len(left_tag)-2:-1].lower() def _equal_tags(self, left_tag, right_tag): if left_tag in ['?', '?php', 'div'] : # handle PHP, etc. return True if ("/" + left_tag) == right_tag: return True if (right_tag == "--" and left_tag == "--") : return True elif left_tag == right_tag[1:] \ and right_tag[0] != "<": return True else: return False def _is_oneliner(self, tag): return (tag in ['hr', 'hr/']) def run (self, text) : new_blocks = [] text = text.split("\n\n") items = [] left_tag = '' right_tag = '' in_tag = False # flag for block in text: if block.startswith("\n") : block = block[1:] if not in_tag: if block.startswith("<"): left_tag = self._get_left_tag(block) right_tag = self._get_right_tag(left_tag, block) if not (is_block_level(left_tag) \ or block[1] in ["!", "?", "@", "%"]): new_blocks.append(block) continue if self._is_oneliner(left_tag): new_blocks.append(block.strip()) continue if block[1] == "!": # is a comment block left_tag = "--" right_tag = self._get_right_tag(left_tag, block) # keep checking conditions below and maybe just append if block.rstrip().endswith(">") \ and self._equal_tags(left_tag, right_tag): new_blocks.append( self.stash.store(block.strip())) continue else: #if not block[1] == "!": # if is block level tag and is not complete items.append(block.strip()) in_tag = True continue new_blocks.append(block) else: items.append(block.strip()) right_tag = self._get_right_tag(left_tag, block) if self._equal_tags(left_tag, right_tag): # if find closing tag in_tag = False new_blocks.append( self.stash.store('\n\n'.join(items))) items = [] if items : new_blocks.append(self.stash.store('\n\n'.join(items))) new_blocks.append('\n') return "\n\n".join(new_blocks) HTML_BLOCK_PREPROCESSOR = HtmlBlockPreprocessor() class ReferencePreprocessor (Preprocessor): def run (self, lines) : new_text = []; for line in lines: m = RE.regExp['reference-def'].match(line) if m: id = m.group(2).strip().lower() t = m.group(4).strip() # potential title if not t : self.references[id] = (m.group(3), t) elif (len(t) >= 2 and (t[0] == t[-1] == "\"" or t[0] == t[-1] == "\'" or (t[0] == "(" and t[-1] == ")") ) ) : self.references[id] = (m.group(3), t[1:-1]) else : new_text.append(line) else: new_text.append(line) return new_text #+ "\n" REFERENCE_PREPROCESSOR = ReferencePreprocessor() """ ====================================================================== ========================== INLINE PATTERNS =========================== ====================================================================== Inline patterns such as *emphasis* are handled by means of auxiliary objects, one per pattern. Pattern objects must be instances of classes that extend markdown.Pattern. Each pattern object uses a single regular expression and needs support the following methods: pattern.getCompiledRegExp() - returns a regular expression pattern.handleMatch(m, doc) - takes a match object and returns a NanoDom node (as a part of the provided doc) or None All of python markdown's built-in patterns subclass from Patter, but you can add additional patterns that don't. Also note that all the regular expressions used by inline must capture the whole block. For this reason, they all start with '^(.*)' and end with '(.*)!'. In case with built-in expression Pattern takes care of adding the "^(.*)" and "(.*)!". Finally, the order in which regular expressions are applied is very important - e.g. if we first replace http://.../ links with tags and _then_ try to replace inline html, we would end up with a mess. So, we apply the expressions in the following order: * escape and backticks have to go before everything else, so that we can preempt any markdown patterns by escaping them. * then we handle auto-links (must be done before inline html) * then we handle inline HTML. At this point we will simply replace all inline HTML strings with a placeholder and add the actual HTML to a hash. * then inline images (must be done before links) * then bracketed links, first regular then reference-style * finally we apply strong and emphasis """ NOBRACKET = r'[^\]\[]*' BRK = ( r'\[(' + (NOBRACKET + r'(\[')*6 + (NOBRACKET+ r'\])*')*6 + NOBRACKET + r')\]' ) BACKTICK_RE = r'\`([^\`]*)\`' # `e= m*c^2` DOUBLE_BACKTICK_RE = r'\`\`(.*)\`\`' # ``e=f("`")`` ESCAPE_RE = r'\\(.)' # \< EMPHASIS_RE = r'\*([^\*]*)\*' # *emphasis* STRONG_RE = r'\*\*(.*)\*\*' # **strong** STRONG_EM_RE = r'\*\*\*([^_]*)\*\*\*' # ***strong*** if SMART_EMPHASIS: EMPHASIS_2_RE = r'(?\)' # [text]() IMAGE_LINK_RE = r'\!' + BRK + r'\s*\(([^\)]*)\)' # ![alttxt](http://x.com/) REFERENCE_RE = BRK+ r'\s*\[([^\]]*)\]' # [Google][3] IMAGE_REFERENCE_RE = r'\!' + BRK + '\s*\[([^\]]*)\]' # ![alt text][2] NOT_STRONG_RE = r'( \* )' # stand-alone * or _ AUTOLINK_RE = r'<(http://[^>]*)>' # AUTOMAIL_RE = r'<([^> \!]*@[^> ]*)>' # #HTML_RE = r'(\<[^\>]*\>)' # <...> HTML_RE = r'(\<[a-zA-Z/][^\>]*\>)' # <...> ENTITY_RE = r'(&[\#a-zA-Z0-9]*;)' # & LINE_BREAK_RE = r' \n' # two spaces at end of line LINE_BREAK_2_RE = r' $' # two spaces at end of text class Pattern: def __init__ (self, pattern) : self.pattern = pattern self.compiled_re = re.compile("^(.*)%s(.*)$" % pattern, re.DOTALL) def getCompiledRegExp (self) : return self.compiled_re BasePattern = Pattern # for backward compatibility class SimpleTextPattern (Pattern) : def handleMatch(self, m, doc) : return doc.createTextNode(m.group(2)) class SimpleTagPattern (Pattern): def __init__ (self, pattern, tag) : Pattern.__init__(self, pattern) self.tag = tag def handleMatch(self, m, doc) : el = doc.createElement(self.tag) el.appendChild(doc.createTextNode(m.group(2))) return el class SubstituteTagPattern (SimpleTagPattern): def handleMatch (self, m, doc) : return doc.createElement(self.tag) class BacktickPattern (Pattern): def __init__ (self, pattern): Pattern.__init__(self, pattern) self.tag = "code" def handleMatch(self, m, doc) : el = doc.createElement(self.tag) text = m.group(2).strip() #text = text.replace("&", "&") el.appendChild(doc.createTextNode(text)) return el class DoubleTagPattern (SimpleTagPattern) : def handleMatch(self, m, doc) : tag1, tag2 = self.tag.split(",") el1 = doc.createElement(tag1) el2 = doc.createElement(tag2) el1.appendChild(el2) el2.appendChild(doc.createTextNode(m.group(2))) return el1 class HtmlPattern (Pattern): def handleMatch (self, m, doc) : rawhtml = m.group(2) inline = True place_holder = self.stash.store(rawhtml) return doc.createTextNode(place_holder) class LinkPattern (Pattern): def handleMatch(self, m, doc) : el = doc.createElement('a') el.appendChild(doc.createTextNode(m.group(2))) parts = m.group(9).split('"') # We should now have [], [href], or [href, title] if parts : el.setAttribute('href', parts[0].strip()) else : el.setAttribute('href', "") if len(parts) > 1 : # we also got a title title = '"' + '"'.join(parts[1:]).strip() title = dequote(title) #.replace('"', """) el.setAttribute('title', title) return el class ImagePattern (Pattern): def handleMatch(self, m, doc): el = doc.createElement('img') src_parts = m.group(9).split() if src_parts : el.setAttribute('src', src_parts[0]) else: el.setAttribute('src', "") if len(src_parts) > 1 : el.setAttribute('title', dequote(" ".join(src_parts[1:]))) if ENABLE_ATTRIBUTES : text = doc.createTextNode(m.group(2)) el.appendChild(text) text.handleAttributes() truealt = text.value el.childNodes.remove(text) else: truealt = m.group(2) el.setAttribute('alt', truealt) return el class ReferencePattern (Pattern): def handleMatch(self, m, doc): if m.group(9) : id = m.group(9).lower() else : # if we got something like "[Google][]" # we'll use "google" as the id id = m.group(2).lower() if not self.references.has_key(id) : # ignore undefined refs return None href, title = self.references[id] text = m.group(2) return self.makeTag(href, title, text, doc) def makeTag(self, href, title, text, doc): el = doc.createElement('a') el.setAttribute('href', href) if title : el.setAttribute('title', title) el.appendChild(doc.createTextNode(text)) return el class ImageReferencePattern (ReferencePattern): def makeTag(self, href, title, text, doc): el = doc.createElement('img') el.setAttribute('src', href) if title : el.setAttribute('title', title) el.setAttribute('alt', text) return el class AutolinkPattern (Pattern): def handleMatch(self, m, doc): el = doc.createElement('a') el.setAttribute('href', m.group(2)) el.appendChild(doc.createTextNode(m.group(2))) return el class AutomailPattern (Pattern): def handleMatch(self, m, doc) : el = doc.createElement('a') email = m.group(2) if email.startswith("mailto:"): email = email[len("mailto:"):] for letter in email: entity = doc.createEntityReference("#%d" % ord(letter)) el.appendChild(entity) mailto = "mailto:" + email mailto = "".join(['&#%d;' % ord(letter) for letter in mailto]) el.setAttribute('href', mailto) return el ESCAPE_PATTERN = SimpleTextPattern(ESCAPE_RE) NOT_STRONG_PATTERN = SimpleTextPattern(NOT_STRONG_RE) BACKTICK_PATTERN = BacktickPattern(BACKTICK_RE) DOUBLE_BACKTICK_PATTERN = BacktickPattern(DOUBLE_BACKTICK_RE) STRONG_PATTERN = SimpleTagPattern(STRONG_RE, 'strong') STRONG_PATTERN_2 = SimpleTagPattern(STRONG_2_RE, 'strong') EMPHASIS_PATTERN = SimpleTagPattern(EMPHASIS_RE, 'em') EMPHASIS_PATTERN_2 = SimpleTagPattern(EMPHASIS_2_RE, 'em') STRONG_EM_PATTERN = DoubleTagPattern(STRONG_EM_RE, 'strong,em') STRONG_EM_PATTERN_2 = DoubleTagPattern(STRONG_EM_2_RE, 'strong,em') LINE_BREAK_PATTERN = SubstituteTagPattern(LINE_BREAK_RE, 'br ') LINE_BREAK_PATTERN_2 = SubstituteTagPattern(LINE_BREAK_2_RE, 'br ') LINK_PATTERN = LinkPattern(LINK_RE) LINK_ANGLED_PATTERN = LinkPattern(LINK_ANGLED_RE) IMAGE_LINK_PATTERN = ImagePattern(IMAGE_LINK_RE) IMAGE_REFERENCE_PATTERN = ImageReferencePattern(IMAGE_REFERENCE_RE) REFERENCE_PATTERN = ReferencePattern(REFERENCE_RE) HTML_PATTERN = HtmlPattern(HTML_RE) ENTITY_PATTERN = HtmlPattern(ENTITY_RE) AUTOLINK_PATTERN = AutolinkPattern(AUTOLINK_RE) AUTOMAIL_PATTERN = AutomailPattern(AUTOMAIL_RE) """ ====================================================================== ========================== POST-PROCESSORS =========================== ====================================================================== Markdown also allows post-processors, which are similar to preprocessors in that they need to implement a "run" method. Unlike pre-processors, they take a NanoDom document as a parameter and work with that. Post-Processor should extend markdown.Postprocessor. There are currently no standard post-processors, but the footnote extension below uses one. """ class Postprocessor : pass """ ====================================================================== ======================== TEXT-POST-PROCESSORS ======================== ====================================================================== Markdown also allows text-post-processors, which are similar to textpreprocessors in that they need to implement a "run" method. Unlike post-processors, they take a text string as a parameter and should return a string. Text-Post-Processors should extend markdown.Postprocessor. """ class RawHtmlTextPostprocessor(Postprocessor) : def __init__(self): pass def run(self, text): for i in range(self.stash.html_counter) : html, safe = self.stash.rawHtmlBlocks[i] if self.safeMode and not safe : if str(self.safeMode).lower() == 'escape' : html = self.escape(html) elif str(self.safeMode).lower() == 'remove' : html = '' else : html = HTML_REMOVED_TEXT text = text.replace("

%s\n

" % (HTML_PLACEHOLDER % i), html + "\n") text = text.replace(HTML_PLACEHOLDER % i, html) return text def escape(self, html): ''' Basic html escaping ''' html = html.replace('&', '&') html = html.replace('<', '<') html = html.replace('>', '>') return html.replace('"', '"') RAWHTMLTEXTPOSTPROCESSOR = RawHtmlTextPostprocessor() """ ====================================================================== ========================== MISC AUXILIARY CLASSES ==================== ====================================================================== """ class HtmlStash : """This class is used for stashing HTML objects that we extract in the beginning and replace with place-holders.""" def __init__ (self) : self.html_counter = 0 # for counting inline html segments self.rawHtmlBlocks=[] def store(self, html, safe=False) : """Saves an HTML segment for later reinsertion. Returns a placeholder string that needs to be inserted into the document. @param html: an html segment @param safe: label an html segment as safe for safemode @param inline: label a segmant as inline html @returns : a placeholder string """ self.rawHtmlBlocks.append((html, safe)) placeholder = HTML_PLACEHOLDER % self.html_counter self.html_counter += 1 return placeholder class BlockGuru : def _findHead(self, lines, fn, allowBlank=0) : """Functional magic to help determine boundaries of indented blocks. @param lines: an array of strings @param fn: a function that returns a substring of a string if the string matches the necessary criteria @param allowBlank: specifies whether it's ok to have blank lines between matching functions @returns: a list of post processes items and the unused remainder of the original list""" items = [] item = -1 i = 0 # to keep track of where we are for line in lines : if not line.strip() and not allowBlank: return items, lines[i:] if not line.strip() and allowBlank: # If we see a blank line, this _might_ be the end i += 1 # Find the next non-blank line for j in range(i, len(lines)) : if lines[j].strip() : next = lines[j] break else : # There is no more text => this is the end break # Check if the next non-blank line is still a part of the list part = fn(next) if part : items.append("") continue else : break # found end of the list part = fn(line) if part : items.append(part) i += 1 continue else : return items, lines[i:] else : i += 1 return items, lines[i:] def detabbed_fn(self, line) : """ An auxiliary method to be passed to _findHead """ m = RE.regExp['tabbed'].match(line) if m: return m.group(4) else : return None def detectTabbed(self, lines) : return self._findHead(lines, self.detabbed_fn, allowBlank = 1) def print_error(string): """Print an error string to stderr""" sys.stderr.write(string +'\n') def dequote(string) : """ Removes quotes from around a string """ if ( ( string.startswith('"') and string.endswith('"')) or (string.startswith("'") and string.endswith("'")) ) : return string[1:-1] else : return string """ ====================================================================== ========================== CORE MARKDOWN ============================= ====================================================================== This stuff is ugly, so if you are thinking of extending the syntax, see first if you can do it via pre-processors, post-processors, inline patterns or a combination of the three. """ class CorePatterns : """This class is scheduled for removal as part of a refactoring effort.""" patterns = { 'header': r'(#*)([^#]*)(#*)', # # A title 'reference-def' : r'(\ ?\ ?\ ?)\[([^\]]*)\]:\s*([^ ]*)(.*)', # [Google]: http://www.google.com/ 'containsline': r'([-]*)$|^([=]*)', # -----, =====, etc. 'ol': r'[ ]{0,3}[\d]*\.\s+(.*)', # 1. text 'ul': r'[ ]{0,3}[*+-]\s+(.*)', # "* text" 'isline1': r'(\**)', # *** 'isline2': r'(\-*)', # --- 'isline3': r'(\_*)', # ___ 'tabbed': r'((\t)|( ))(.*)', # an indented line 'quoted' : r'> ?(.*)', # a quoted block ("> ...") } def __init__ (self) : self.regExp = {} for key in self.patterns.keys() : self.regExp[key] = re.compile("^%s$" % self.patterns[key], re.DOTALL) self.regExp['containsline'] = re.compile(r'^([-]*)$|^([=]*)$', re.M) RE = CorePatterns() class Markdown: """ Markdown formatter class for creating an html document from Markdown text """ def __init__(self, source=None, # deprecated extensions=[], extension_configs=None, encoding="utf-8", safe_mode = False): """Creates a new Markdown instance. @param source: The text in Markdown format. @param encoding: The character encoding of . """ self.safeMode = safe_mode self.encoding = encoding self.source = source self.blockGuru = BlockGuru() self.registeredExtensions = [] self.stripTopLevelTags = 1 self.docType = "" self.textPreprocessors = [ HTML_BLOCK_PREPROCESSOR] self.preprocessors = [ HEADER_PREPROCESSOR, LINE_PREPROCESSOR, # A footnote preprocessor will # get inserted here REFERENCE_PREPROCESSOR ] self.postprocessors = [] # a footnote postprocessor will get # inserted later self.textPostprocessors = [ # a footnote postprocessor will get # inserted here RAWHTMLTEXTPOSTPROCESSOR ] self.prePatterns = [] self.inlinePatterns = [ DOUBLE_BACKTICK_PATTERN, BACKTICK_PATTERN, ESCAPE_PATTERN, IMAGE_LINK_PATTERN, IMAGE_REFERENCE_PATTERN, REFERENCE_PATTERN, LINK_ANGLED_PATTERN, LINK_PATTERN, AUTOLINK_PATTERN, AUTOMAIL_PATTERN, LINE_BREAK_PATTERN_2, LINE_BREAK_PATTERN, HTML_PATTERN, ENTITY_PATTERN, NOT_STRONG_PATTERN, STRONG_EM_PATTERN, STRONG_EM_PATTERN_2, STRONG_PATTERN, STRONG_PATTERN_2, EMPHASIS_PATTERN, EMPHASIS_PATTERN_2 # The order of the handlers matters!!! ] self.registerExtensions(extensions = extensions, configs = extension_configs) self.reset() def registerExtensions(self, extensions, configs) : if not configs : configs = {} for ext in extensions : extension_module_name = "mdx_" + ext try : module = __import__(extension_module_name) except : message(CRITICAL, "couldn't load extension %s (looking for %s module)" % (ext, extension_module_name) ) else : if configs.has_key(ext) : configs_for_ext = configs[ext] else : configs_for_ext = [] extension = module.makeExtension(configs_for_ext) extension.extendMarkdown(self, globals()) def registerExtension(self, extension) : """ This gets called by the extension """ self.registeredExtensions.append(extension) def reset(self) : """Resets all state variables so that we can start with a new text.""" self.references={} self.htmlStash = HtmlStash() HTML_BLOCK_PREPROCESSOR.stash = self.htmlStash LINE_PREPROCESSOR.stash = self.htmlStash REFERENCE_PREPROCESSOR.references = self.references HTML_PATTERN.stash = self.htmlStash ENTITY_PATTERN.stash = self.htmlStash REFERENCE_PATTERN.references = self.references IMAGE_REFERENCE_PATTERN.references = self.references RAWHTMLTEXTPOSTPROCESSOR.stash = self.htmlStash RAWHTMLTEXTPOSTPROCESSOR.safeMode = self.safeMode for extension in self.registeredExtensions : extension.reset() def _transform(self): """Transforms the Markdown text into a XHTML body document @returns: A NanoDom Document """ # Setup the document self.doc = Document() self.top_element = self.doc.createElement("span") self.top_element.appendChild(self.doc.createTextNode('\n')) self.top_element.setAttribute('class', 'markdown') self.doc.appendChild(self.top_element) # Fixup the source text text = self.source text = text.replace("\r\n", "\n").replace("\r", "\n") text += "\n\n" text = text.expandtabs(TAB_LENGTH) # Split into lines and run the preprocessors that will work with # self.lines self.lines = text.split("\n") # Run the pre-processors on the lines for prep in self.preprocessors : self.lines = prep.run(self.lines) # Create a NanoDom tree from the lines and attach it to Document buffer = [] for line in self.lines : if line.startswith("#") : self._processSection(self.top_element, buffer) buffer = [line] else : buffer.append(line) self._processSection(self.top_element, buffer) #self._processSection(self.top_element, self.lines) # Not sure why I put this in but let's leave it for now. self.top_element.appendChild(self.doc.createTextNode('\n')) # Run the post-processors for postprocessor in self.postprocessors : postprocessor.run(self.doc) return self.doc def _processSection(self, parent_elem, lines, inList = 0, looseList = 0) : """Process a section of a source document, looking for high level structural elements like lists, block quotes, code segments, html blocks, etc. Some those then get stripped of their high level markup (e.g. get unindented) and the lower-level markup is processed recursively. @param parent_elem: A NanoDom element to which the content will be added @param lines: a list of lines @param inList: a level @returns: None""" if not lines : return # Check if this section starts with a list, a blockquote or # a code block processFn = { 'ul' : self._processUList, 'ol' : self._processOList, 'quoted' : self._processQuote, 'tabbed' : self._processCodeBlock } for regexp in ['ul', 'ol', 'quoted', 'tabbed'] : m = RE.regExp[regexp].match(lines[0]) if m : processFn[regexp](parent_elem, lines, inList) return # We are NOT looking at one of the high-level structures like # lists or blockquotes. So, it's just a regular paragraph # (though perhaps nested inside a list or something else). If # we are NOT inside a list, we just need to look for a blank # line to find the end of the block. If we ARE inside a # list, however, we need to consider that a sublist does not # need to be separated by a blank line. Rather, the following # markup is legal: # # * The top level list item # # Another paragraph of the list. This is where we are now. # * Underneath we might have a sublist. # if inList : start, theRest = self._linesUntil(lines, (lambda line: RE.regExp['ul'].match(line) or RE.regExp['ol'].match(line) or not line.strip())) self._processSection(parent_elem, start, inList - 1, looseList = looseList) self._processSection(parent_elem, theRest, inList - 1, looseList = looseList) else : # Ok, so it's just a simple block paragraph, theRest = self._linesUntil(lines, lambda line: not line.strip()) if len(paragraph) and paragraph[0].startswith('#') : self._processHeader(parent_elem, paragraph) elif paragraph : self._processParagraph(parent_elem, paragraph, inList, looseList) if theRest : theRest = theRest[1:] # skip the first (blank) line self._processSection(parent_elem, theRest, inList) def _processHeader(self, parent_elem, paragraph) : m = RE.regExp['header'].match(paragraph[0]) if m : level = len(m.group(1)) h = self.doc.createElement("h%d" % level) parent_elem.appendChild(h) for item in self._handleInlineWrapper(m.group(2).strip()) : h.appendChild(item) else : message(CRITICAL, "We've got a problem header!") def _processParagraph(self, parent_elem, paragraph, inList, looseList) : list = self._handleInlineWrapper("\n".join(paragraph)) if ( parent_elem.nodeName == 'li' and not (looseList or parent_elem.childNodes)): # If this is the first paragraph inside "li", don't # put

around it - append the paragraph bits directly # onto parent_elem el = parent_elem else : # Otherwise make a "p" element el = self.doc.createElement("p") parent_elem.appendChild(el) for item in list : el.appendChild(item) def _processUList(self, parent_elem, lines, inList) : self._processList(parent_elem, lines, inList, listexpr='ul', tag = 'ul') def _processOList(self, parent_elem, lines, inList) : self._processList(parent_elem, lines, inList, listexpr='ol', tag = 'ol') def _processList(self, parent_elem, lines, inList, listexpr, tag) : """Given a list of document lines starting with a list item, finds the end of the list, breaks it up, and recursively processes each list item and the remainder of the text file. @param parent_elem: A dom element to which the content will be added @param lines: a list of lines @param inList: a level @returns: None""" ul = self.doc.createElement(tag) # ul might actually be '

    ' parent_elem.appendChild(ul) looseList = 0 # Make a list of list items items = [] item = -1 i = 0 # a counter to keep track of where we are for line in lines : loose = 0 if not line.strip() : # If we see a blank line, this _might_ be the end of the list i += 1 loose = 1 # Find the next non-blank line for j in range(i, len(lines)) : if lines[j].strip() : next = lines[j] break else : # There is no more text => end of the list break # Check if the next non-blank line is still a part of the list if ( RE.regExp['ul'].match(next) or RE.regExp['ol'].match(next) or RE.regExp['tabbed'].match(next) ): # get rid of any white space in the line items[item].append(line.strip()) looseList = loose or looseList continue else : break # found end of the list # Now we need to detect list items (at the current level) # while also detabing child elements if necessary for expr in ['ul', 'ol', 'tabbed']: m = RE.regExp[expr].match(line) if m : if expr in ['ul', 'ol'] : # We are looking at a new item #if m.group(1) : # Removed the check to allow for a blank line # at the beginning of the list item items.append([m.group(1)]) item += 1 elif expr == 'tabbed' : # This line needs to be detabbed items[item].append(m.group(4)) #after the 'tab' i += 1 break else : items[item].append(line) # Just regular continuation i += 1 # added on 2006.02.25 else : i += 1 # Add the dom elements for item in items : li = self.doc.createElement("li") ul.appendChild(li) self._processSection(li, item, inList + 1, looseList = looseList) # Process the remaining part of the section self._processSection(parent_elem, lines[i:], inList) def _linesUntil(self, lines, condition) : """ A utility function to break a list of lines upon the first line that satisfied a condition. The condition argument should be a predicate function. """ i = -1 for line in lines : i += 1 if condition(line) : break else : i += 1 return lines[:i], lines[i:] def _processQuote(self, parent_elem, lines, inList) : """Given a list of document lines starting with a quote finds the end of the quote, unindents it and recursively processes the body of the quote and the remainder of the text file. @param parent_elem: DOM element to which the content will be added @param lines: a list of lines @param inList: a level @returns: None """ dequoted = [] i = 0 blank_line = False # allow one blank line between paragraphs for line in lines : m = RE.regExp['quoted'].match(line) if m : dequoted.append(m.group(1)) i += 1 blank_line = False elif not blank_line and line.strip() != '' : dequoted.append(line) i += 1 elif not blank_line and line.strip() == '' : dequoted.append(line) i += 1 blank_line = True else : break blockquote = self.doc.createElement('blockquote') parent_elem.appendChild(blockquote) self._processSection(blockquote, dequoted, inList) self._processSection(parent_elem, lines[i:], inList) def _processCodeBlock(self, parent_elem, lines, inList) : """Given a list of document lines starting with a code block finds the end of the block, puts it into the dom verbatim wrapped in ("
    ") and recursively processes the
               the remainder of the text file.
    
               @param parent_elem: DOM element to which the content will be added
               @param lines: a list of lines
               @param inList: a level
               @returns: None"""
    
            detabbed, theRest = self.blockGuru.detectTabbed(lines)
    
            pre = self.doc.createElement('pre')
            code = self.doc.createElement('code')
            parent_elem.appendChild(pre)
            pre.appendChild(code)
            text = "\n".join(detabbed).rstrip()+"\n"
            #text = text.replace("&", "&")
            code.appendChild(self.doc.createTextNode(text))
            self._processSection(parent_elem, theRest, inList)
    
    
    
        def _handleInlineWrapper (self, line, patternIndex=0) :
    
            parts = [line]
    
            while patternIndex < len(self.inlinePatterns) :
    
                i = 0
    
                while i < len(parts) :
                    
                    x = parts[i]
    
                    if isinstance(x, (str, unicode)) :
                        result = self._applyPattern(x, \
                                    self.inlinePatterns[patternIndex], \
                                    patternIndex )
    
                        if result :
                            i -= 1
                            parts.remove(x)
                            for y in result :
                                parts.insert(i+1,y)
    
                    i += 1
                patternIndex += 1
    
            for i in range(len(parts)) :
                x = parts[i]
                if isinstance(x, (str, unicode)) :
                    parts[i] = self.doc.createTextNode(x)
    
            return parts
            
    
        def _handleInline(self,  line):
            """Transform a Markdown line with inline elements to an XHTML
            fragment.
    
            This function uses auxiliary objects called inline patterns.
            See notes on inline patterns above.
    
            @param item: A block of Markdown text
            @return: A list of NanoDom nodes """
    
            if not(line):
                return [self.doc.createTextNode(' ')]
    
            for pattern in self.inlinePatterns :
                list = self._applyPattern( line, pattern)
                if list: return list
    
            return [self.doc.createTextNode(line)]
    
        def _applyPattern(self, line, pattern, patternIndex) :
    
            """ Given a pattern name, this function checks if the line
            fits the pattern, creates the necessary elements, and returns
            back a list consisting of NanoDom elements and/or strings.
            
            @param line: the text to be processed
            @param pattern: the pattern to be checked
    
            @returns: the appropriate newly created NanoDom element if the
                      pattern matches, None otherwise.
            """
    
            # match the line to pattern's pre-compiled reg exp.
            # if no match, move on.
    
    
    
            m = pattern.getCompiledRegExp().match(line)
            if not m :
                return None
    
            # if we got a match let the pattern make us a NanoDom node
            # if it doesn't, move on
            node = pattern.handleMatch(m, self.doc)
    
            # check if any of this nodes have children that need processing
    
            if isinstance(node, Element):
    
                if not node.nodeName in ["code", "pre"] :
                    for child in node.childNodes :
                        if isinstance(child, TextNode):
                            
                            result = self._handleInlineWrapper(child.value, patternIndex+1)
                            
                            if result:
    
                                if result == [child] :
                                    continue
                                    
                                result.reverse()
                                #to make insertion easier
    
                                position = node.childNodes.index(child)
                                
                                node.removeChild(child)
    
                                for item in result:
    
                                    if isinstance(item, (str, unicode)):
                                        if len(item) > 0:
                                            node.insertChild(position,
                                                 self.doc.createTextNode(item))
                                    else:
                                        node.insertChild(position, item)
                    
    
    
    
            if node :
                # Those are in the reverse order!
                return ( m.groups()[-1], # the string to the left
                         node,           # the new node
                         m.group(1))     # the string to the right of the match
    
            else :
                return None
    
        def convert (self, source = None):
            """Return the document in XHTML format.
    
            @returns: A serialized XHTML body."""
            #try :
    
            if source is not None: #Allow blank string
                self.source = source
    
            if not self.source :
                return ""
    
            self.source = removeBOM(self.source, self.encoding)
    
            for pp in self.textPreprocessors :
                self.source = pp.run(self.source)
    
            doc = self._transform()
            xml = doc.toxml()
    
            #finally:
            #    doc.unlink()
    
            # Return everything but the top level tag
    
            if self.stripTopLevelTags :
                xml = xml.strip()[23:-7] + "\n"
    
            for pp in self.textPostprocessors :
                xml = pp.run(xml)
    
            return (self.docType + xml).strip()
    
    
        __str__ = convert   # deprecated - will be changed in 1.7 to report
                            # information about the MD instance
        
        toString = __str__  # toString() method is deprecated
    
    
        def __unicode__(self):
            """Return the document in XHTML format as a Unicode object.
            """
            return str(self)#.decode(self.encoding)
    
    
        toUnicode = __unicode__  # deprecated - will be removed in 1.7
    
    
    
    
    # ====================================================================
    
    def markdownFromFile(input = None,
                         output = None,
                         extensions = [],
                         encoding = None,
                         message_threshold = CRITICAL,
                         safe = False) :
    
        global MESSAGE_THRESHOLD
        MESSAGE_THRESHOLD = message_threshold
    
        message(VERBOSE, "input file: %s" % input)
    
    
        if not encoding :
            encoding = "utf-8"
    
        input_file = codecs.open(input, mode="r", encoding=encoding)
        text = input_file.read()
        input_file.close()
    
        new_text = markdown(text, extensions, encoding, safe_mode = safe)
    
        if output :
            output_file = codecs.open(output, "w", encoding=encoding)
            output_file.write(new_text)
            output_file.close()
    
        else :
            sys.stdout.write(new_text.encode(encoding))
    
    def markdown(text,
                 extensions = [],
                 encoding = None,
                 safe_mode = False) :
        
        message(VERBOSE, "in markdown.markdown(), received text:\n%s" % text)
    
        extension_names = []
        extension_configs = {}
        
        for ext in extensions :
            pos = ext.find("(") 
            if pos == -1 :
                extension_names.append(ext)
            else :
                name = ext[:pos]
                extension_names.append(name)
                pairs = [x.split("=") for x in ext[pos+1:-1].split(",")]
                configs = [(x.strip(), y.strip()) for (x, y) in pairs]
                extension_configs[name] = configs
    
        md = Markdown(extensions=extension_names,
                      extension_configs=extension_configs,
                      safe_mode = safe_mode)
    
        return md.convert(text)
            
    
    class Extension :
    
        def __init__(self, configs = {}) :
            self.config = configs
    
        def getConfig(self, key) :
            if self.config.has_key(key) :
                return self.config[key][0]
            else :
                return ""
    
        def getConfigInfo(self) :
            return [(key, self.config[key][1]) for key in self.config.keys()]
    
        def setConfig(self, key, value) :
            self.config[key][0] = value
    
    
    OPTPARSE_WARNING = """
    Python 2.3 or higher required for advanced command line options.
    For lower versions of Python use:
    
          %s INPUT_FILE > OUTPUT_FILE
        
    """ % EXECUTABLE_NAME_FOR_USAGE
    
    def parse_options() :
    
        try :
            optparse = __import__("optparse")
        except :
            if len(sys.argv) == 2 :
                return {'input' : sys.argv[1],
                        'output' : None,
                        'message_threshold' : CRITICAL,
                        'safe' : False,
                        'extensions' : [],
                        'encoding' : None }
    
            else :
                print OPTPARSE_WARNING
                return None
    
        parser = optparse.OptionParser(usage="%prog INPUTFILE [options]")
    
        parser.add_option("-f", "--file", dest="filename",
                          help="write output to OUTPUT_FILE",
                          metavar="OUTPUT_FILE")
        parser.add_option("-e", "--encoding", dest="encoding",
                          help="encoding for input and output files",)
        parser.add_option("-q", "--quiet", default = CRITICAL,
                          action="store_const", const=NONE, dest="verbose",
                          help="suppress all messages")
        parser.add_option("-v", "--verbose",
                          action="store_const", const=INFO, dest="verbose",
                          help="print info messages")
        parser.add_option("-s", "--safe",
                          action="store_const", const=True, dest="safe",
                          help="same mode (strip user's HTML tag)")
        
        parser.add_option("--noisy",
                          action="store_const", const=VERBOSE, dest="verbose",
                          help="print debug messages")
        parser.add_option("-x", "--extension", action="append", dest="extensions",
                          help = "load extension EXTENSION", metavar="EXTENSION")
    
        (options, args) = parser.parse_args()
    
        if not len(args) == 1 :
            parser.print_help()
            return None
        else :
            input_file = args[0]
    
        if not options.extensions :
            options.extensions = []
    
        return {'input' : input_file,
                'output' : options.filename,
                'message_threshold' : options.verbose,
                'safe' : options.safe,
                'extensions' : options.extensions,
                'encoding' : options.encoding }
    
    if __name__ == '__main__':
        """ Run Markdown from the command line. """
    
        options = parse_options()
    
        #if os.access(inFile, os.R_OK):
    
        if not options :
            sys.exit(0)
        
        markdownFromFile(**options)