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374 lines
13 KiB
374 lines
13 KiB
1 week ago
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"""
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Table of Contents Extension for Python-Markdown
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===============================================
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See <https://Python-Markdown.github.io/extensions/toc>
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for documentation.
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Oringinal code Copyright 2008 [Jack Miller](https://codezen.org/)
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All changes Copyright 2008-2014 The Python Markdown Project
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License: [BSD](https://opensource.org/licenses/bsd-license.php)
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"""
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from . import Extension
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from ..treeprocessors import Treeprocessor
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from ..util import code_escape, parseBoolValue, AMP_SUBSTITUTE, HTML_PLACEHOLDER_RE, AtomicString
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from ..postprocessors import UnescapePostprocessor
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import re
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import html
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import unicodedata
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import xml.etree.ElementTree as etree
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def slugify(value, separator, encoding='ascii'):
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""" Slugify a string, to make it URL friendly. """
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value = unicodedata.normalize('NFKD', value).encode(encoding, 'ignore')
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value = re.sub(r'[^\w\s-]', '', value.decode(encoding)).strip().lower()
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return re.sub(r'[{}\s]+'.format(separator), separator, value)
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def slugify_unicode(value, separator):
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""" Slugify a string, to make it URL friendly while preserving Unicode characters. """
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return slugify(value, separator, 'utf-8')
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IDCOUNT_RE = re.compile(r'^(.*)_([0-9]+)$')
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def unique(id, ids):
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""" Ensure id is unique in set of ids. Append '_1', '_2'... if not """
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while id in ids or not id:
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m = IDCOUNT_RE.match(id)
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if m:
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id = '%s_%d' % (m.group(1), int(m.group(2))+1)
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else:
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id = '%s_%d' % (id, 1)
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ids.add(id)
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return id
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def get_name(el):
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"""Get title name."""
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text = []
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for c in el.itertext():
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if isinstance(c, AtomicString):
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text.append(html.unescape(c))
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else:
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text.append(c)
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return ''.join(text).strip()
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def stashedHTML2text(text, md, strip_entities=True):
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""" Extract raw HTML from stash, reduce to plain text and swap with placeholder. """
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def _html_sub(m):
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""" Substitute raw html with plain text. """
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try:
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raw = md.htmlStash.rawHtmlBlocks[int(m.group(1))]
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except (IndexError, TypeError): # pragma: no cover
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return m.group(0)
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# Strip out tags and/or entities - leaving text
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res = re.sub(r'(<[^>]+>)', '', raw)
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if strip_entities:
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res = re.sub(r'(&[\#a-zA-Z0-9]+;)', '', res)
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return res
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return HTML_PLACEHOLDER_RE.sub(_html_sub, text)
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def unescape(text):
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""" Unescape escaped text. """
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c = UnescapePostprocessor()
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return c.run(text)
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def nest_toc_tokens(toc_list):
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"""Given an unsorted list with errors and skips, return a nested one.
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[{'level': 1}, {'level': 2}]
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=>
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[{'level': 1, 'children': [{'level': 2, 'children': []}]}]
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A wrong list is also converted:
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[{'level': 2}, {'level': 1}]
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=>
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[{'level': 2, 'children': []}, {'level': 1, 'children': []}]
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"""
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ordered_list = []
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if len(toc_list):
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# Initialize everything by processing the first entry
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last = toc_list.pop(0)
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last['children'] = []
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levels = [last['level']]
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ordered_list.append(last)
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parents = []
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# Walk the rest nesting the entries properly
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while toc_list:
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t = toc_list.pop(0)
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current_level = t['level']
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t['children'] = []
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# Reduce depth if current level < last item's level
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if current_level < levels[-1]:
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# Pop last level since we know we are less than it
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levels.pop()
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# Pop parents and levels we are less than or equal to
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to_pop = 0
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for p in reversed(parents):
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if current_level <= p['level']:
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to_pop += 1
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else: # pragma: no cover
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break
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if to_pop:
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levels = levels[:-to_pop]
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parents = parents[:-to_pop]
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# Note current level as last
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levels.append(current_level)
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# Level is the same, so append to
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# the current parent (if available)
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if current_level == levels[-1]:
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(parents[-1]['children'] if parents
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else ordered_list).append(t)
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# Current level is > last item's level,
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# So make last item a parent and append current as child
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else:
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last['children'].append(t)
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parents.append(last)
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levels.append(current_level)
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last = t
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return ordered_list
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class TocTreeprocessor(Treeprocessor):
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def __init__(self, md, config):
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super().__init__(md)
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self.marker = config["marker"]
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self.title = config["title"]
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self.base_level = int(config["baselevel"]) - 1
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self.slugify = config["slugify"]
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self.sep = config["separator"]
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self.use_anchors = parseBoolValue(config["anchorlink"])
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self.anchorlink_class = config["anchorlink_class"]
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self.use_permalinks = parseBoolValue(config["permalink"], False)
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if self.use_permalinks is None:
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self.use_permalinks = config["permalink"]
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self.permalink_class = config["permalink_class"]
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self.permalink_title = config["permalink_title"]
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self.header_rgx = re.compile("[Hh][123456]")
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if isinstance(config["toc_depth"], str) and '-' in config["toc_depth"]:
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self.toc_top, self.toc_bottom = [int(x) for x in config["toc_depth"].split('-')]
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else:
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self.toc_top = 1
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self.toc_bottom = int(config["toc_depth"])
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def iterparent(self, node):
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''' Iterator wrapper to get allowed parent and child all at once. '''
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# We do not allow the marker inside a header as that
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# would causes an enless loop of placing a new TOC
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# inside previously generated TOC.
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for child in node:
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if not self.header_rgx.match(child.tag) and child.tag not in ['pre', 'code']:
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yield node, child
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yield from self.iterparent(child)
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def replace_marker(self, root, elem):
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''' Replace marker with elem. '''
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for (p, c) in self.iterparent(root):
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text = ''.join(c.itertext()).strip()
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if not text:
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continue
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# To keep the output from screwing up the
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# validation by putting a <div> inside of a <p>
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# we actually replace the <p> in its entirety.
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if c.text and c.text.strip() == self.marker:
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for i in range(len(p)):
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if p[i] == c:
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p[i] = elem
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break
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def set_level(self, elem):
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''' Adjust header level according to base level. '''
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level = int(elem.tag[-1]) + self.base_level
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if level > 6:
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level = 6
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elem.tag = 'h%d' % level
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def add_anchor(self, c, elem_id): # @ReservedAssignment
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anchor = etree.Element("a")
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anchor.text = c.text
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anchor.attrib["href"] = "#" + elem_id
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anchor.attrib["class"] = self.anchorlink_class
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c.text = ""
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for elem in c:
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anchor.append(elem)
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while len(c):
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c.remove(c[0])
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c.append(anchor)
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def add_permalink(self, c, elem_id):
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permalink = etree.Element("a")
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permalink.text = ("%spara;" % AMP_SUBSTITUTE
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if self.use_permalinks is True
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else self.use_permalinks)
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permalink.attrib["href"] = "#" + elem_id
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permalink.attrib["class"] = self.permalink_class
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if self.permalink_title:
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permalink.attrib["title"] = self.permalink_title
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c.append(permalink)
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def build_toc_div(self, toc_list):
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""" Return a string div given a toc list. """
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div = etree.Element("div")
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div.attrib["class"] = "toc"
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# Add title to the div
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if self.title:
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header = etree.SubElement(div, "span")
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header.attrib["class"] = "toctitle"
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header.text = self.title
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def build_etree_ul(toc_list, parent):
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ul = etree.SubElement(parent, "ul")
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for item in toc_list:
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# List item link, to be inserted into the toc div
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li = etree.SubElement(ul, "li")
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link = etree.SubElement(li, "a")
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link.text = item.get('name', '')
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link.attrib["href"] = '#' + item.get('id', '')
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if item['children']:
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build_etree_ul(item['children'], li)
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return ul
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build_etree_ul(toc_list, div)
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if 'prettify' in self.md.treeprocessors:
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self.md.treeprocessors['prettify'].run(div)
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return div
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def run(self, doc):
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# Get a list of id attributes
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used_ids = set()
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for el in doc.iter():
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if "id" in el.attrib:
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used_ids.add(el.attrib["id"])
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toc_tokens = []
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for el in doc.iter():
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if isinstance(el.tag, str) and self.header_rgx.match(el.tag):
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self.set_level(el)
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if int(el.tag[-1]) < self.toc_top or int(el.tag[-1]) > self.toc_bottom:
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continue
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text = get_name(el)
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# Do not override pre-existing ids
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if "id" not in el.attrib:
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innertext = unescape(stashedHTML2text(text, self.md))
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el.attrib["id"] = unique(self.slugify(innertext, self.sep), used_ids)
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toc_tokens.append({
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'level': int(el.tag[-1]),
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'id': el.attrib["id"],
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'name': unescape(stashedHTML2text(
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code_escape(el.attrib.get('data-toc-label', text)),
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self.md, strip_entities=False
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))
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})
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# Remove the data-toc-label attribute as it is no longer needed
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if 'data-toc-label' in el.attrib:
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del el.attrib['data-toc-label']
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if self.use_anchors:
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self.add_anchor(el, el.attrib["id"])
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if self.use_permalinks not in [False, None]:
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self.add_permalink(el, el.attrib["id"])
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toc_tokens = nest_toc_tokens(toc_tokens)
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div = self.build_toc_div(toc_tokens)
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if self.marker:
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self.replace_marker(doc, div)
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# serialize and attach to markdown instance.
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toc = self.md.serializer(div)
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for pp in self.md.postprocessors:
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toc = pp.run(toc)
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self.md.toc_tokens = toc_tokens
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self.md.toc = toc
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class TocExtension(Extension):
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TreeProcessorClass = TocTreeprocessor
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def __init__(self, **kwargs):
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self.config = {
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"marker": ['[TOC]',
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'Text to find and replace with Table of Contents - '
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'Set to an empty string to disable. Defaults to "[TOC]"'],
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"title": ["",
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"Title to insert into TOC <div> - "
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"Defaults to an empty string"],
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"anchorlink": [False,
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"True if header should be a self link - "
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"Defaults to False"],
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"anchorlink_class": ['toclink',
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'CSS class(es) used for the link. '
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'Defaults to "toclink"'],
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"permalink": [0,
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"True or link text if a Sphinx-style permalink should "
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"be added - Defaults to False"],
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"permalink_class": ['headerlink',
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'CSS class(es) used for the link. '
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'Defaults to "headerlink"'],
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"permalink_title": ["Permanent link",
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"Title attribute of the permalink - "
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"Defaults to 'Permanent link'"],
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"baselevel": ['1', 'Base level for headers.'],
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"slugify": [slugify,
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"Function to generate anchors based on header text - "
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"Defaults to the headerid ext's slugify function."],
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'separator': ['-', 'Word separator. Defaults to "-".'],
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"toc_depth": [6,
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'Define the range of section levels to include in'
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'the Table of Contents. A single integer (b) defines'
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'the bottom section level (<h1>..<hb>) only.'
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'A string consisting of two digits separated by a hyphen'
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'in between ("2-5"), define the top (t) and the'
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'bottom (b) (<ht>..<hb>). Defaults to `6` (bottom).'],
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}
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super().__init__(**kwargs)
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def extendMarkdown(self, md):
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md.registerExtension(self)
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self.md = md
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self.reset()
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tocext = self.TreeProcessorClass(md, self.getConfigs())
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# Headerid ext is set to '>prettify'. With this set to '_end',
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# it should always come after headerid ext (and honor ids assinged
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# by the header id extension) if both are used. Same goes for
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# attr_list extension. This must come last because we don't want
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# to redefine ids after toc is created. But we do want toc prettified.
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md.treeprocessors.register(tocext, 'toc', 5)
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def reset(self):
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self.md.toc = ''
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self.md.toc_tokens = []
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def makeExtension(**kwargs): # pragma: no cover
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return TocExtension(**kwargs)
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