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-rw-r--r--markdown_extensions/toc.py127
1 files changed, 127 insertions, 0 deletions
diff --git a/markdown_extensions/toc.py b/markdown_extensions/toc.py
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+++ b/markdown_extensions/toc.py
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+"""
+Table of Contents Extension for Python-Markdown
+* * *
+
+(c) 2008 [Jack Miller](http://codezen.org)
+
+Dependencies:
+* [Markdown 2.0+](http://www.freewisdom.org/projects/python-markdown/)
+
+"""
+import markdown
+from markdown import etree
+import re
+
+class TocPostprocessor (markdown.Postprocessor):
+ # Iterator wrapper to get parent and child all at once
+ def iterparent(self, root):
+ for parent in root.getiterator():
+ for child in parent:
+ yield parent, child
+
+ def run(self, doc) :
+ div = etree.Element("div")
+ div.attrib["class"] = "toc"
+ last_li = None
+
+ # Add title to the div
+ if self.config["title"][0]:
+ header = etree.SubElement(div, "span")
+ header.attrib["class"] = "toctitle"
+ header.text = self.config["title"][0]
+
+ level = 0
+ list_stack=[div]
+ header_rgx = re.compile("[Hh][123456]")
+
+ for (p, c) in self.iterparent(doc):
+ if not c.text:
+ continue
+
+ # To keep the output from screwing up the
+ # validation by putting a <div> inside of a <p>
+ # we actually replace the <p> in its entirety.
+
+ if c.text.find(self.config["marker"][0]) > -1:
+ for i in range(len(p)):
+ if p[i] == c:
+ p[i] = div
+ break
+
+ if header_rgx.match(c.tag):
+ tag_level = int(c.tag[-1])
+
+ # Regardless of how many levels we jumped
+ # only one list should be created, since
+ # empty lists containing lists are illegal.
+
+ if tag_level < level:
+ list_stack.pop()
+ level = tag_level
+
+ if tag_level > level:
+ newlist = etree.Element("ul")
+ if last_li:
+ last_li.append(newlist)
+ else:
+ list_stack[-1].append(newlist)
+ list_stack.append(newlist)
+ level = tag_level
+
+ # Do not override pre-existing ids
+ if c.attrib.has_key("id"):
+ id = c.attrib["id"]
+ else:
+ id = self.config["slugify"][0](c.text)
+
+ # List item link, to be inserted into the toc div
+ last_li = etree.Element("li")
+ link = etree.SubElement(last_li, "a")
+ link.text = c.text
+ link.attrib["href"] = '#' + id
+
+ if int(self.config["anchorlink"][0]):
+ anchor = etree.SubElement(c, "a")
+ anchor.text = c.text
+ anchor.attrib["id"] = id
+ anchor.attrib["href"] = "#" + id
+ anchor.attrib["class"] = "toclink"
+ c.text = ""
+ else:
+ c.attrib["id"] = id
+
+ list_stack[-1].append(last_li)
+
+class TocExtension (markdown.Extension):
+ def __init__(self, configs):
+ self.config = { "marker" : ["[TOC]",
+ "Text to find and replace with Table of Contents -"
+ "Defaults to \"[TOC]\""],
+ "slugify" : [self.slugify,
+ "Function to generate anchors based on header text-"
+ "Defaults to a built in slugify function."],
+ "title" : [None,
+ "Title to insert into TOC <div> - "
+ "Defaults to None"],
+ "anchorlink" : [0,
+ "1 if header should be a self link"
+ "Defaults to 0"]}
+
+ for key, value in configs:
+ self.setConfig(key, value)
+
+ # This is exactly the same as Django's slugify
+ def slugify(self, value):
+ """ Slugify a string, to make it URL friendly. """
+ import unicodedata
+ value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore')
+ value = unicode(re.sub('[^\w\s-]', '', value).strip().lower())
+ return re.sub('[-\s]+','-',value)
+
+ def extendMarkdown(self, md, md_globals) :
+ tocext = TocPostprocessor(md)
+ tocext.config = self.config
+ md.postprocessors.add("toc", tocext, "_begin")
+
+def makeExtension(configs={}) :
+ return TocExtension(configs=configs)