| """ |
| Table of Contents Extension for Python-Markdown |
| =============================================== |
| |
| See <https://pythonhosted.org/Markdown/extensions/toc.html> |
| for documentation. |
| |
| Oringinal code Copyright 2008 [Jack Miller](http://codezen.org) |
| |
| All changes Copyright 2008-2014 The Python Markdown Project |
| |
| License: [BSD](http://www.opensource.org/licenses/bsd-license.php) |
| |
| """ |
| |
| from __future__ import absolute_import |
| from __future__ import unicode_literals |
| from . import Extension |
| from ..treeprocessors import Treeprocessor |
| from ..util import etree, parseBoolValue, AMP_SUBSTITUTE, HTML_PLACEHOLDER_RE, string_type |
| import re |
| import unicodedata |
| |
| |
| def slugify(value, separator): |
| """ Slugify a string, to make it URL friendly. """ |
| value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore') |
| value = re.sub('[^\w\s-]', '', value.decode('ascii')).strip().lower() |
| return re.sub('[%s\s]+' % separator, separator, value) |
| |
| |
| IDCOUNT_RE = re.compile(r'^(.*)_([0-9]+)$') |
| |
| |
| def unique(id, ids): |
| """ Ensure id is unique in set of ids. Append '_1', '_2'... if not """ |
| while id in ids or not id: |
| m = IDCOUNT_RE.match(id) |
| if m: |
| id = '%s_%d' % (m.group(1), int(m.group(2))+1) |
| else: |
| id = '%s_%d' % (id, 1) |
| ids.add(id) |
| return id |
| |
| |
| def stashedHTML2text(text, md): |
| """ Extract raw HTML from stash, reduce to plain text and swap with placeholder. """ |
| def _html_sub(m): |
| """ Substitute raw html with plain text. """ |
| try: |
| raw, safe = md.htmlStash.rawHtmlBlocks[int(m.group(1))] |
| except (IndexError, TypeError): # pragma: no cover |
| return m.group(0) |
| if md.safeMode and not safe: # pragma: no cover |
| return '' |
| # Strip out tags and entities - leaveing text |
| return re.sub(r'(<[^>]+>)|(&[\#a-zA-Z0-9]+;)', '', raw) |
| |
| return HTML_PLACEHOLDER_RE.sub(_html_sub, text) |
| |
| |
| def nest_toc_tokens(toc_list): |
| """Given an unsorted list with errors and skips, return a nested one. |
| [{'level': 1}, {'level': 2}] |
| => |
| [{'level': 1, 'children': [{'level': 2, 'children': []}]}] |
| |
| A wrong list is also converted: |
| [{'level': 2}, {'level': 1}] |
| => |
| [{'level': 2, 'children': []}, {'level': 1, 'children': []}] |
| """ |
| |
| ordered_list = [] |
| if len(toc_list): |
| # Initialize everything by processing the first entry |
| last = toc_list.pop(0) |
| last['children'] = [] |
| levels = [last['level']] |
| ordered_list.append(last) |
| parents = [] |
| |
| # Walk the rest nesting the entries properly |
| while toc_list: |
| t = toc_list.pop(0) |
| current_level = t['level'] |
| t['children'] = [] |
| |
| # Reduce depth if current level < last item's level |
| if current_level < levels[-1]: |
| # Pop last level since we know we are less than it |
| levels.pop() |
| |
| # Pop parents and levels we are less than or equal to |
| to_pop = 0 |
| for p in reversed(parents): |
| if current_level <= p['level']: |
| to_pop += 1 |
| else: # pragma: no cover |
| break |
| if to_pop: |
| levels = levels[:-to_pop] |
| parents = parents[:-to_pop] |
| |
| # Note current level as last |
| levels.append(current_level) |
| |
| # Level is the same, so append to |
| # the current parent (if available) |
| if current_level == levels[-1]: |
| (parents[-1]['children'] if parents |
| else ordered_list).append(t) |
| |
| # Current level is > last item's level, |
| # So make last item a parent and append current as child |
| else: |
| last['children'].append(t) |
| parents.append(last) |
| levels.append(current_level) |
| last = t |
| |
| return ordered_list |
| |
| |
| class TocTreeprocessor(Treeprocessor): |
| def __init__(self, md, config): |
| super(TocTreeprocessor, self).__init__(md) |
| |
| self.marker = config["marker"] |
| self.title = config["title"] |
| self.base_level = int(config["baselevel"]) - 1 |
| self.slugify = config["slugify"] |
| self.sep = config["separator"] |
| self.use_anchors = parseBoolValue(config["anchorlink"]) |
| self.use_permalinks = parseBoolValue(config["permalink"], False) |
| if self.use_permalinks is None: |
| self.use_permalinks = config["permalink"] |
| |
| self.header_rgx = re.compile("[Hh][123456]") |
| |
| def iterparent(self, root): |
| ''' Iterator wrapper to get parent and child all at once. ''' |
| for parent in root.iter(): |
| for child in parent: |
| yield parent, child |
| |
| def replace_marker(self, root, elem): |
| ''' Replace marker with elem. ''' |
| for (p, c) in self.iterparent(root): |
| text = ''.join(c.itertext()).strip() |
| if not 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. |
| # We do not allow the marker inside a header as that |
| # would causes an enless loop of placing a new TOC |
| # inside previously generated TOC. |
| if c.text and c.text.strip() == self.marker and \ |
| not self.header_rgx.match(c.tag) and c.tag not in ['pre', 'code']: |
| for i in range(len(p)): |
| if p[i] == c: |
| p[i] = elem |
| break |
| |
| def set_level(self, elem): |
| ''' Adjust header level according to base level. ''' |
| level = int(elem.tag[-1]) + self.base_level |
| if level > 6: |
| level = 6 |
| elem.tag = 'h%d' % level |
| |
| def add_anchor(self, c, elem_id): # @ReservedAssignment |
| anchor = etree.Element("a") |
| anchor.text = c.text |
| anchor.attrib["href"] = "#" + elem_id |
| anchor.attrib["class"] = "toclink" |
| c.text = "" |
| for elem in c: |
| anchor.append(elem) |
| c.remove(elem) |
| c.append(anchor) |
| |
| def add_permalink(self, c, elem_id): |
| permalink = etree.Element("a") |
| permalink.text = ("%spara;" % AMP_SUBSTITUTE |
| if self.use_permalinks is True |
| else self.use_permalinks) |
| permalink.attrib["href"] = "#" + elem_id |
| permalink.attrib["class"] = "headerlink" |
| permalink.attrib["title"] = "Permanent link" |
| c.append(permalink) |
| |
| def build_toc_div(self, toc_list): |
| """ Return a string div given a toc list. """ |
| div = etree.Element("div") |
| div.attrib["class"] = "toc" |
| |
| # Add title to the div |
| if self.title: |
| header = etree.SubElement(div, "span") |
| header.attrib["class"] = "toctitle" |
| header.text = self.title |
| |
| def build_etree_ul(toc_list, parent): |
| ul = etree.SubElement(parent, "ul") |
| for item in toc_list: |
| # List item link, to be inserted into the toc div |
| li = etree.SubElement(ul, "li") |
| link = etree.SubElement(li, "a") |
| link.text = item.get('name', '') |
| link.attrib["href"] = '#' + item.get('id', '') |
| if item['children']: |
| build_etree_ul(item['children'], li) |
| return ul |
| |
| build_etree_ul(toc_list, div) |
| prettify = self.markdown.treeprocessors.get('prettify') |
| if prettify: |
| prettify.run(div) |
| return div |
| |
| def run(self, doc): |
| # Get a list of id attributes |
| used_ids = set() |
| for el in doc.iter(): |
| if "id" in el.attrib: |
| used_ids.add(el.attrib["id"]) |
| |
| toc_tokens = [] |
| for el in doc.iter(): |
| if isinstance(el.tag, string_type) and self.header_rgx.match(el.tag): |
| self.set_level(el) |
| text = ''.join(el.itertext()).strip() |
| |
| # Do not override pre-existing ids |
| if "id" not in el.attrib: |
| innertext = stashedHTML2text(text, self.markdown) |
| el.attrib["id"] = unique(self.slugify(innertext, self.sep), used_ids) |
| |
| toc_tokens.append({ |
| 'level': int(el.tag[-1]), |
| 'id': el.attrib["id"], |
| 'name': text |
| }) |
| |
| if self.use_anchors: |
| self.add_anchor(el, el.attrib["id"]) |
| if self.use_permalinks: |
| self.add_permalink(el, el.attrib["id"]) |
| |
| div = self.build_toc_div(nest_toc_tokens(toc_tokens)) |
| if self.marker: |
| self.replace_marker(doc, div) |
| |
| # serialize and attach to markdown instance. |
| toc = self.markdown.serializer(div) |
| for pp in self.markdown.postprocessors.values(): |
| toc = pp.run(toc) |
| self.markdown.toc = toc |
| |
| |
| class TocExtension(Extension): |
| |
| TreeProcessorClass = TocTreeprocessor |
| |
| def __init__(self, *args, **kwargs): |
| self.config = { |
| "marker": ['[TOC]', |
| 'Text to find and replace with Table of Contents - ' |
| 'Set to an empty string to disable. Defaults to "[TOC]"'], |
| "title": ["", |
| "Title to insert into TOC <div> - " |
| "Defaults to an empty string"], |
| "anchorlink": [False, |
| "True if header should be a self link - " |
| "Defaults to False"], |
| "permalink": [0, |
| "True or link text if a Sphinx-style permalink should " |
| "be added - Defaults to False"], |
| "baselevel": ['1', 'Base level for headers.'], |
| "slugify": [slugify, |
| "Function to generate anchors based on header text - " |
| "Defaults to the headerid ext's slugify function."], |
| 'separator': ['-', 'Word separator. Defaults to "-".'] |
| } |
| |
| super(TocExtension, self).__init__(*args, **kwargs) |
| |
| def extendMarkdown(self, md, md_globals): |
| md.registerExtension(self) |
| self.md = md |
| self.reset() |
| tocext = self.TreeProcessorClass(md, self.getConfigs()) |
| # Headerid ext is set to '>prettify'. With this set to '_end', |
| # it should always come after headerid ext (and honor ids assinged |
| # by the header id extension) if both are used. Same goes for |
| # attr_list extension. This must come last because we don't want |
| # to redefine ids after toc is created. But we do want toc prettified. |
| md.treeprocessors.add("toc", tocext, "_end") |
| |
| def reset(self): |
| self.md.toc = '' |
| |
| |
| def makeExtension(*args, **kwargs): |
| return TocExtension(*args, **kwargs) |