Current File : //lib/python3/dist-packages/markdown/extensions/attr_list.py
# Attribute List Extension for Python-Markdown
# ============================================
# Adds attribute list syntax. Inspired by
# [Maruku](http://maruku.rubyforge.org/proposal.html#attribute_lists)'s
# feature of the same name.
# See https://Python-Markdown.github.io/extensions/attr_list
# for documentation.
# Original code Copyright 2011 [Waylan Limberg](http://achinghead.com/).
# All changes Copyright 2011-2014 The Python Markdown Project
# License: [BSD](https://opensource.org/licenses/bsd-license.php)
"""
Adds attribute list syntax. Inspired by
[Maruku](http://maruku.rubyforge.org/proposal.html#attribute_lists)'s
feature of the same name.
See the [documentation](https://Python-Markdown.github.io/extensions/attr_list)
for details.
"""
from __future__ import annotations
from typing import TYPE_CHECKING
from . import Extension
from ..treeprocessors import Treeprocessor
import re
if TYPE_CHECKING: # pragma: no cover
from xml.etree.ElementTree import Element
def _handle_double_quote(s, t):
k, v = t.split('=', 1)
return k, v.strip('"')
def _handle_single_quote(s, t):
k, v = t.split('=', 1)
return k, v.strip("'")
def _handle_key_value(s, t):
return t.split('=', 1)
def _handle_word(s, t):
if t.startswith('.'):
return '.', t[1:]
if t.startswith('#'):
return 'id', t[1:]
return t, t
_scanner = re.Scanner([
(r'[^ =]+=".*?"', _handle_double_quote),
(r"[^ =]+='.*?'", _handle_single_quote),
(r'[^ =]+=[^ =]+', _handle_key_value),
(r'[^ =]+', _handle_word),
(r' ', None)
])
def get_attrs(str: str) -> list[tuple[str, str]]:
""" Parse attribute list and return a list of attribute tuples. """
return _scanner.scan(str)[0]
def isheader(elem: Element) -> bool:
return elem.tag in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']
class AttrListTreeprocessor(Treeprocessor):
BASE_RE = r'\{\:?[ ]*([^\}\n ][^\}\n]*)[ ]*\}'
HEADER_RE = re.compile(r'[ ]+{}[ ]*$'.format(BASE_RE))
BLOCK_RE = re.compile(r'\n[ ]*{}[ ]*$'.format(BASE_RE))
INLINE_RE = re.compile(r'^{}'.format(BASE_RE))
NAME_RE = re.compile(r'[^A-Z_a-z\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u02ff'
r'\u0370-\u037d\u037f-\u1fff\u200c-\u200d'
r'\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff'
r'\uf900-\ufdcf\ufdf0-\ufffd'
r'\:\-\.0-9\u00b7\u0300-\u036f\u203f-\u2040]+')
def run(self, doc: Element) -> None:
for elem in doc.iter():
if self.md.is_block_level(elem.tag):
# Block level: check for `attrs` on last line of text
RE = self.BLOCK_RE
if isheader(elem) or elem.tag in ['dt', 'td', 'th']:
# header, def-term, or table cell: check for attributes at end of element
RE = self.HEADER_RE
if len(elem) and elem.tag == 'li':
# special case list items. children may include a `ul` or `ol`.
pos = None
# find the `ul` or `ol` position
for i, child in enumerate(elem):
if child.tag in ['ul', 'ol']:
pos = i
break
if pos is None and elem[-1].tail:
# use tail of last child. no `ul` or `ol`.
m = RE.search(elem[-1].tail)
if m:
self.assign_attrs(elem, m.group(1))
elem[-1].tail = elem[-1].tail[:m.start()]
elif pos is not None and pos > 0 and elem[pos-1].tail:
# use tail of last child before `ul` or `ol`
m = RE.search(elem[pos-1].tail)
if m:
self.assign_attrs(elem, m.group(1))
elem[pos-1].tail = elem[pos-1].tail[:m.start()]
elif elem.text:
# use text. `ul` is first child.
m = RE.search(elem.text)
if m:
self.assign_attrs(elem, m.group(1))
elem.text = elem.text[:m.start()]
elif len(elem) and elem[-1].tail:
# has children. Get from tail of last child
m = RE.search(elem[-1].tail)
if m:
self.assign_attrs(elem, m.group(1))
elem[-1].tail = elem[-1].tail[:m.start()]
if isheader(elem):
# clean up trailing #s
elem[-1].tail = elem[-1].tail.rstrip('#').rstrip()
elif elem.text:
# no children. Get from text.
m = RE.search(elem.text)
if m:
self.assign_attrs(elem, m.group(1))
elem.text = elem.text[:m.start()]
if isheader(elem):
# clean up trailing #s
elem.text = elem.text.rstrip('#').rstrip()
else:
# inline: check for `attrs` at start of tail
if elem.tail:
m = self.INLINE_RE.match(elem.tail)
if m:
self.assign_attrs(elem, m.group(1))
elem.tail = elem.tail[m.end():]
def assign_attrs(self, elem: Element, attrs: str) -> None:
""" Assign `attrs` to element. """
for k, v in get_attrs(attrs):
if k == '.':
# add to class
cls = elem.get('class')
if cls:
elem.set('class', '{} {}'.format(cls, v))
else:
elem.set('class', v)
else:
# assign attribute `k` with `v`
elem.set(self.sanitize_name(k), v)
def sanitize_name(self, name: str) -> str:
"""
Sanitize name as 'an XML Name, minus the ":"'.
See https://www.w3.org/TR/REC-xml-names/#NT-NCName
"""
return self.NAME_RE.sub('_', name)
class AttrListExtension(Extension):
""" Attribute List extension for Python-Markdown """
def extendMarkdown(self, md):
md.treeprocessors.register(AttrListTreeprocessor(md), 'attr_list', 8)
md.registerExtension(self)
def makeExtension(**kwargs): # pragma: no cover
return AttrListExtension(**kwargs)
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