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-"""
-========================= FOOTNOTES =================================
-
-This section adds footnote handling to markdown. It can be used as
-an example for extending python-markdown with relatively complex
-functionality. While in this case the extension is included inside
-the module itself, it could just as easily be added from outside the
-module. Not that all markdown classes above are ignorant about
-footnotes. All footnote functionality is provided separately and
-then added to the markdown instance at the run time.
-
-Footnote functionality is attached by calling extendMarkdown()
-method of FootnoteExtension. The method also registers the
-extension to allow it's state to be reset by a call to reset()
-method.
-
-Example:
- Footnotes[^1] have a label[^label] and a definition[^!DEF].
-
- [^1]: This is a footnote
- [^label]: A footnote on "label"
- [^!DEF]: The footnote for definition
-
-"""
-
-import re, markdown
-from markdown import etree
-
-FN_BACKLINK_TEXT = "zz1337820767766393qq"
-NBSP_PLACEHOLDER = "qq3936677670287331zz"
-DEF_RE = re.compile(r'(\ ?\ ?\ ?)\[\^([^\]]*)\]:\s*(.*)')
-TABBED_RE = re.compile(r'((\t)|( ))(.*)')
-
-class FootnoteExtension(markdown.Extension):
- """ Footnote Extension. """
-
- def __init__ (self, configs):
- """ Setup configs. """
- self.config = {'PLACE_MARKER':
- ["///Footnotes Go Here///",
- "The text string that marks where the footnotes go"]}
-
- for key, value in configs:
- self.config[key][0] = value
-
- self.reset()
-
- def extendMarkdown(self, md, md_globals):
- """ Add pieces to Markdown. """
- md.registerExtension(self)
- self.parser = md.parser
- # Insert a preprocessor before ReferencePreprocessor
- md.preprocessors.add("footnote", FootnotePreprocessor(self),
- "<reference")
- # Insert an inline pattern before ImageReferencePattern
- FOOTNOTE_RE = r'\[\^([^\]]*)\]' # blah blah [^1] blah
- md.inlinePatterns.add("footnote", FootnotePattern(FOOTNOTE_RE, self),
- "<reference")
- # Insert a tree-processor that would actually add the footnote div
- # This must be before the inline treeprocessor so inline patterns
- # run on the contents of the div.
- md.treeprocessors.add("footnote", FootnoteTreeprocessor(self),
- "<inline")
- # Insert a postprocessor after amp_substitute oricessor
- md.postprocessors.add("footnote", FootnotePostprocessor(self),
- ">amp_substitute")
-
- def reset(self):
- """ Clear the footnotes on reset. """
- self.footnotes = markdown.odict.OrderedDict()
-
- def findFootnotesPlaceholder(self, root):
- """ Return ElementTree Element that contains Footnote placeholder. """
- def finder(element):
- for child in element:
- if child.text:
- if child.text.find(self.getConfig("PLACE_MARKER")) > -1:
- return child, True
- if child.tail:
- if child.tail.find(self.getConfig("PLACE_MARKER")) > -1:
- return (child, element), False
- finder(child)
- return None
-
- res = finder(root)
- return res
-
- def setFootnote(self, id, text):
- """ Store a footnote for later retrieval. """
- self.footnotes[id] = text
-
- def makeFootnoteId(self, id):
- """ Return footnote link id. """
- return 'fn:%s' % id
-
- def makeFootnoteRefId(self, id):
- """ Return footnote back-link id. """
- return 'fnref:%s' % id
-
- def makeFootnotesDiv(self, root):
- """ Return div of footnotes as et Element. """
-
- if not self.footnotes.keys():
- return None
-
- div = etree.Element("div")
- div.set('class', 'footnote')
- hr = etree.SubElement(div, "hr")
- ol = etree.SubElement(div, "ol")
-
- for id in self.footnotes.keys():
- li = etree.SubElement(ol, "li")
- li.set("id", self.makeFootnoteId(id))
- self.parser.parseChunk(li, self.footnotes[id])
- backlink = etree.Element("a")
- backlink.set("href", "#" + self.makeFootnoteRefId(id))
- backlink.set("rev", "footnote")
- backlink.set("title", "Jump back to footnote %d in the text" % \
- (self.footnotes.index(id)+1))
- backlink.text = FN_BACKLINK_TEXT
-
- if li.getchildren():
- node = li[-1]
- if node.tag == "p":
- node.text = node.text + NBSP_PLACEHOLDER
- node.append(backlink)
- else:
- p = etree.SubElement(li, "p")
- p.append(backlink)
- return div
-
-
-class FootnotePreprocessor(markdown.preprocessors.Preprocessor):
- """ Find all footnote references and store for later use. """
-
- def __init__ (self, footnotes):
- self.footnotes = footnotes
-
- def run(self, lines):
- lines = self._handleFootnoteDefinitions(lines)
- text = "\n".join(lines)
- return text.split("\n")
-
- def _handleFootnoteDefinitions(self, lines):
- """
- Recursively find all footnote definitions in lines.
-
- Keywords:
-
- * lines: A list of lines of text
-
- Return: A list of lines with footnote definitions removed.
-
- """
- i, id, footnote = self._findFootnoteDefinition(lines)
-
- if id :
- plain = lines[:i]
- detabbed, theRest = self.detectTabbed(lines[i+1:])
- self.footnotes.setFootnote(id,
- footnote + "\n"
- + "\n".join(detabbed))
- more_plain = self._handleFootnoteDefinitions(theRest)
- return plain + [""] + more_plain
- else :
- return lines
-
- def _findFootnoteDefinition(self, lines):
- """
- Find the parts of a footnote definition.
-
- Keywords:
-
- * lines: A list of lines of text.
-
- Return: A three item tuple containing the index of the first line of a
- footnote definition, the id of the definition and the body of the
- definition.
-
- """
- counter = 0
- for line in lines:
- m = DEF_RE.match(line)
- if m:
- return counter, m.group(2), m.group(3)
- counter += 1
- return counter, None, None
-
- def detectTabbed(self, lines):
- """ Find indented text and remove indent before further proccesing.
-
- Keyword arguments:
-
- * lines: an array of strings
-
- Returns: a list of post processed items and the unused
- remainder of the original list
-
- """
- items = []
- item = -1
- i = 0 # to keep track of where we are
-
- def detab(line):
- match = TABBED_RE.match(line)
- if match:
- return match.group(4)
-
- for line in lines:
- if line.strip(): # Non-blank line
- line = detab(line)
- if line:
- items.append(line)
- i += 1
- continue
- else:
- return items, lines[i:]
-
- else: # Blank line: _maybe_ we are done.
- i += 1 # advance
-
- # Find the next non-blank line
- for j in range(i, len(lines)):
- if lines[j].strip():
- next_line = lines[j]; break
- else:
- break # There is no more text; we are done.
-
- # Check if the next non-blank line is tabbed
- if detab(next_line): # Yes, more work to do.
- items.append("")
- continue
- else:
- break # No, we are done.
- else:
- i += 1
-
- return items, lines[i:]
-
-
-class FootnotePattern(markdown.inlinepatterns.Pattern):
- """ InlinePattern for footnote markers in a document's body text. """
-
- def __init__(self, pattern, footnotes):
- markdown.inlinepatterns.Pattern.__init__(self, pattern)
- self.footnotes = footnotes
-
- def handleMatch(self, m):
- sup = etree.Element("sup")
- a = etree.SubElement(sup, "a")
- id = m.group(2)
- sup.set('id', self.footnotes.makeFootnoteRefId(id))
- a.set('href', '#' + self.footnotes.makeFootnoteId(id))
- a.set('rel', 'footnote')
- a.text = str(self.footnotes.footnotes.index(id) + 1)
- return sup
-
-
-class FootnoteTreeprocessor(markdown.treeprocessors.Treeprocessor):
- """ Build and append footnote div to end of document. """
-
- def __init__ (self, footnotes):
- self.footnotes = footnotes
-
- def run(self, root):
- footnotesDiv = self.footnotes.makeFootnotesDiv(root)
- if footnotesDiv:
- result = self.footnotes.findFootnotesPlaceholder(root)
- if result:
- node, isText = result
- if isText:
- node.text = None
- node.getchildren().insert(0, footnotesDiv)
- else:
- child, element = node
- ind = element.getchildren().find(child)
- element.getchildren().insert(ind + 1, footnotesDiv)
- child.tail = None
- fnPlaceholder.parent.replaceChild(fnPlaceholder, footnotesDiv)
- else:
- root.append(footnotesDiv)
-
-class FootnotePostprocessor(markdown.postprocessors.Postprocessor):
- """ Replace placeholders with html entities. """
-
- def run(self, text):
- text = text.replace(FN_BACKLINK_TEXT, "&#8617;")
- return text.replace(NBSP_PLACEHOLDER, "&#160;")
-
-def makeExtension(configs=[]):
- """ Return an instance of the FootnoteExtension """
- return FootnoteExtension(configs=configs)
-