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HeaderID Extension for Python-Markdown
Auto-generate id attributes for HTML headers.
See <>
for documentation.
Original code Copyright 2007-2011 [Waylan Limberg](
All changes Copyright 2011-2014 The Python Markdown Project
License: [BSD](
from __future__ import absolute_import
from __future__ import unicode_literals
from . import Extension
from ..treeprocessors import Treeprocessor
from ..util import parseBoolValue
from .toc import slugify, unique, stashedHTML2text
import warnings
class HeaderIdTreeprocessor(Treeprocessor):
""" Assign IDs to headers. """
IDs = set()
def run(self, doc):
start_level, force_id = self._get_meta()
slugify = self.config['slugify']
sep = self.config['separator']
for elem in doc:
if elem.tag in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
if force_id:
if "id" in elem.attrib:
id = elem.get('id')
id = stashedHTML2text(''.join(elem.itertext()),
id = slugify(id, sep)
elem.set('id', unique(id, self.IDs))
if start_level:
level = int(elem.tag[-1]) + start_level
if level > 6:
level = 6
elem.tag = 'h%d' % level
def _get_meta(self):
""" Return meta data suported by this ext as a tuple """
level = int(self.config['level']) - 1
force = parseBoolValue(self.config['forceid'])
if hasattr(, 'Meta'):
if 'header_level' in
level = int(['header_level'][0]) - 1
if 'header_forceid' in
force = parseBoolValue(['header_forceid'][0])
return level, force
class HeaderIdExtension(Extension):
def __init__(self, *args, **kwargs):
# set defaults
self.config = {
'level': ['1', 'Base level for headers.'],
'forceid': ['True', 'Force all headers to have an id.'],
'separator': ['-', 'Word separator.'],
'slugify': [slugify, 'Callable to generate anchors']
super(HeaderIdExtension, self).__init__(*args, **kwargs)
'The HeaderId Extension is pending deprecation. Use the TOC Extension instead.',
def extendMarkdown(self, md, md_globals):
self.processor = HeaderIdTreeprocessor() = md
self.processor.config = self.getConfigs()
if 'attr_list' in md.treeprocessors.keys():
# insert after attr_list treeprocessor
md.treeprocessors.add('headerid', self.processor, '>attr_list')
# insert after 'prettify' treeprocessor.
md.treeprocessors.add('headerid', self.processor, '>prettify')
def reset(self):
self.processor.IDs = set()
def makeExtension(*args, **kwargs):
return HeaderIdExtension(*args, **kwargs)