generated from itdominator/Python-With-Gtk-Template
409 lines
14 KiB
Python
409 lines
14 KiB
Python
# Table of Contents Extension for Python-Markdown
|
|
# ===============================================
|
|
|
|
# See https://Python-Markdown.github.io/extensions/toc
|
|
# for documentation.
|
|
|
|
# Original code Copyright 2008 [Jack Miller](https://codezen.org/)
|
|
|
|
# All changes Copyright 2008-2014 The Python Markdown Project
|
|
|
|
# License: [BSD](https://opensource.org/licenses/bsd-license.php)
|
|
|
|
"""
|
|
Add table of contents support to Python-Markdown.
|
|
|
|
See the [documentation](https://Python-Markdown.github.io/extensions/toc)
|
|
for details.
|
|
"""
|
|
|
|
from __future__ import annotations
|
|
|
|
from . import Extension
|
|
from ..treeprocessors import Treeprocessor
|
|
from ..util import code_escape, parseBoolValue, AMP_SUBSTITUTE, HTML_PLACEHOLDER_RE, AtomicString
|
|
from ..treeprocessors import UnescapeTreeprocessor
|
|
import re
|
|
import html
|
|
import unicodedata
|
|
import xml.etree.ElementTree as etree
|
|
|
|
|
|
def slugify(value, separator, unicode=False):
|
|
""" Slugify a string, to make it URL friendly. """
|
|
if not unicode:
|
|
# Replace Extended Latin characters with ASCII, i.e. `žlutý` => `zluty`
|
|
value = unicodedata.normalize('NFKD', value)
|
|
value = value.encode('ascii', 'ignore').decode('ascii')
|
|
value = re.sub(r'[^\w\s-]', '', value).strip().lower()
|
|
return re.sub(r'[{}\s]+'.format(separator), separator, value)
|
|
|
|
|
|
def slugify_unicode(value, separator):
|
|
""" Slugify a string, to make it URL friendly while preserving Unicode characters. """
|
|
return slugify(value, separator, unicode=True)
|
|
|
|
|
|
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 get_name(el):
|
|
"""Get title name."""
|
|
|
|
text = []
|
|
for c in el.itertext():
|
|
if isinstance(c, AtomicString):
|
|
text.append(html.unescape(c))
|
|
else:
|
|
text.append(c)
|
|
return ''.join(text).strip()
|
|
|
|
|
|
def stashedHTML2text(text, md, strip_entities: bool = True):
|
|
""" 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 = md.htmlStash.rawHtmlBlocks[int(m.group(1))]
|
|
except (IndexError, TypeError): # pragma: no cover
|
|
return m.group(0)
|
|
# Strip out tags and/or entities - leaving text
|
|
res = re.sub(r'(<[^>]+>)', '', raw)
|
|
if strip_entities:
|
|
res = re.sub(r'(&[\#a-zA-Z0-9]+;)', '', res)
|
|
return res
|
|
|
|
return HTML_PLACEHOLDER_RE.sub(_html_sub, text)
|
|
|
|
|
|
def unescape(text):
|
|
""" Unescape escaped text. """
|
|
c = UnescapeTreeprocessor()
|
|
return c.unescape(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):
|
|
""" Step through document and build TOC. """
|
|
|
|
def __init__(self, md, config):
|
|
super().__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.toc_class = config["toc_class"]
|
|
self.title_class = config["title_class"]
|
|
self.use_anchors = parseBoolValue(config["anchorlink"])
|
|
self.anchorlink_class = config["anchorlink_class"]
|
|
self.use_permalinks = parseBoolValue(config["permalink"], False)
|
|
if self.use_permalinks is None:
|
|
self.use_permalinks = config["permalink"]
|
|
self.permalink_class = config["permalink_class"]
|
|
self.permalink_title = config["permalink_title"]
|
|
self.permalink_leading = parseBoolValue(config["permalink_leading"], False)
|
|
self.header_rgx = re.compile("[Hh][123456]")
|
|
if isinstance(config["toc_depth"], str) and '-' in config["toc_depth"]:
|
|
self.toc_top, self.toc_bottom = [int(x) for x in config["toc_depth"].split('-')]
|
|
else:
|
|
self.toc_top = 1
|
|
self.toc_bottom = int(config["toc_depth"])
|
|
|
|
def iterparent(self, node):
|
|
""" Iterator wrapper to get allowed parent and child all at once. """
|
|
|
|
# We do not allow the marker inside a header as that
|
|
# would causes an endless loop of placing a new TOC
|
|
# inside previously generated TOC.
|
|
for child in node:
|
|
if not self.header_rgx.match(child.tag) and child.tag not in ['pre', 'code']:
|
|
yield node, child
|
|
yield from self.iterparent(child)
|
|
|
|
def replace_marker(self, root, elem) -> None:
|
|
""" 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.
|
|
|
|
# The `<p>` element may contain more than a single text content
|
|
# (`nl2br` can introduce a `<br>`). In this situation, `c.text` returns
|
|
# the very first content, ignore children contents or tail content.
|
|
# `len(c) == 0` is here to ensure there is only text in the `<p>`.
|
|
if c.text and c.text.strip() == self.marker and len(c) == 0:
|
|
for i in range(len(p)):
|
|
if p[i] == c:
|
|
p[i] = elem
|
|
break
|
|
|
|
def set_level(self, elem) -> None:
|
|
""" 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) -> None:
|
|
anchor = etree.Element("a")
|
|
anchor.text = c.text
|
|
anchor.attrib["href"] = "#" + elem_id
|
|
anchor.attrib["class"] = self.anchorlink_class
|
|
c.text = ""
|
|
for elem in c:
|
|
anchor.append(elem)
|
|
while len(c):
|
|
c.remove(c[0])
|
|
c.append(anchor)
|
|
|
|
def add_permalink(self, c, elem_id) -> None:
|
|
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"] = self.permalink_class
|
|
if self.permalink_title:
|
|
permalink.attrib["title"] = self.permalink_title
|
|
if self.permalink_leading:
|
|
permalink.tail = c.text
|
|
c.text = ""
|
|
c.insert(0, permalink)
|
|
else:
|
|
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"] = self.toc_class
|
|
|
|
# Add title to the div
|
|
if self.title:
|
|
header = etree.SubElement(div, "span")
|
|
if self.title_class:
|
|
header.attrib["class"] = self.title_class
|
|
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)
|
|
|
|
if 'prettify' in self.md.treeprocessors:
|
|
self.md.treeprocessors['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, str) and self.header_rgx.match(el.tag):
|
|
self.set_level(el)
|
|
text = get_name(el)
|
|
|
|
# Do not override pre-existing ids
|
|
if "id" not in el.attrib:
|
|
innertext = unescape(stashedHTML2text(text, self.md))
|
|
el.attrib["id"] = unique(self.slugify(innertext, self.sep), used_ids)
|
|
|
|
if int(el.tag[-1]) >= self.toc_top and int(el.tag[-1]) <= self.toc_bottom:
|
|
toc_tokens.append({
|
|
'level': int(el.tag[-1]),
|
|
'id': el.attrib["id"],
|
|
'name': unescape(stashedHTML2text(
|
|
code_escape(el.attrib.get('data-toc-label', text)),
|
|
self.md, strip_entities=False
|
|
))
|
|
})
|
|
|
|
# Remove the data-toc-label attribute as it is no longer needed
|
|
if 'data-toc-label' in el.attrib:
|
|
del el.attrib['data-toc-label']
|
|
|
|
if self.use_anchors:
|
|
self.add_anchor(el, el.attrib["id"])
|
|
if self.use_permalinks not in [False, None]:
|
|
self.add_permalink(el, el.attrib["id"])
|
|
|
|
toc_tokens = nest_toc_tokens(toc_tokens)
|
|
div = self.build_toc_div(toc_tokens)
|
|
if self.marker:
|
|
self.replace_marker(doc, div)
|
|
|
|
# serialize and attach to markdown instance.
|
|
toc = self.md.serializer(div)
|
|
for pp in self.md.postprocessors:
|
|
toc = pp.run(toc)
|
|
self.md.toc_tokens = toc_tokens
|
|
self.md.toc = toc
|
|
|
|
|
|
class TocExtension(Extension):
|
|
|
|
TreeProcessorClass = TocTreeprocessor
|
|
|
|
def __init__(self, **kwargs):
|
|
self.config = {
|
|
'marker': [
|
|
'[TOC]',
|
|
'Text to find and replace with Table of Contents. Set to an empty string to disable. '
|
|
'Default: `[TOC]`.'
|
|
],
|
|
'title': [
|
|
'', 'Title to insert into TOC `<div>`. Default: an empty string.'
|
|
],
|
|
'title_class': [
|
|
'toctitle', 'CSS class used for the title. Default: `toctitle`.'
|
|
],
|
|
'toc_class': [
|
|
'toc', 'CSS class(es) used for the link. Default: `toclink`.'
|
|
],
|
|
'anchorlink': [
|
|
False, 'True if header should be a self link. Default: `False`.'
|
|
],
|
|
'anchorlink_class': [
|
|
'toclink', 'CSS class(es) used for the link. Defaults: `toclink`.'
|
|
],
|
|
'permalink': [
|
|
0, 'True or link text if a Sphinx-style permalink should be added. Default: `False`.'
|
|
],
|
|
'permalink_class': [
|
|
'headerlink', 'CSS class(es) used for the link. Default: `headerlink`.'
|
|
],
|
|
'permalink_title': [
|
|
'Permanent link', 'Title attribute of the permalink. Default: `Permanent link`.'
|
|
],
|
|
'permalink_leading': [
|
|
False,
|
|
'True if permalinks should be placed at start of the header, rather than end. Default: False.'
|
|
],
|
|
'baselevel': ['1', 'Base level for headers. Default: `1`.'],
|
|
'slugify': [
|
|
slugify, 'Function to generate anchors based on header text. Default: `slugify`.'
|
|
],
|
|
'separator': ['-', 'Word separator. Default: `-`.'],
|
|
'toc_depth': [
|
|
6,
|
|
'Define the range of section levels to include in the Table of Contents. A single integer '
|
|
'(b) defines the bottom section level (<h1>..<hb>) only. A string consisting of two digits '
|
|
'separated by a hyphen in between (`2-5`) defines the top (t) and the bottom (b) (<ht>..<hb>). '
|
|
'Default: `6` (bottom).'
|
|
],
|
|
}
|
|
""" Default configuration options. """
|
|
|
|
super().__init__(**kwargs)
|
|
|
|
def extendMarkdown(self, md):
|
|
""" Add TOC tree processor to Markdown. """
|
|
md.registerExtension(self)
|
|
self.md = md
|
|
self.reset()
|
|
tocext = self.TreeProcessorClass(md, self.getConfigs())
|
|
md.treeprocessors.register(tocext, 'toc', 5)
|
|
|
|
def reset(self) -> None:
|
|
self.md.toc = ''
|
|
self.md.toc_tokens = []
|
|
|
|
|
|
def makeExtension(**kwargs): # pragma: no cover
|
|
return TocExtension(**kwargs)
|