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"""
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://pythonhosted.org/Markdown/extensions/attr_list.html>
for documentation.
Original code Copyright 2011 [Waylan Limberg](http://achinghead.com/).
All changes Copyright 2011-2014 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 isBlockLevel
import re
try:
Scanner = re.Scanner
except AttributeError: # pragma: no cover
# must be on Python 2.4
from sre import Scanner
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 = Scanner([
(r'[^ =]+=".*?"', _handle_double_quote),
(r"[^ =]+='.*?'", _handle_single_quote),
(r'[^ =]+=[^ =]+', _handle_key_value),
(r'[^ =]+', _handle_word),
(r' ', None)
])
def get_attrs(str):
""" Parse attribute list and return a list of attribute tuples. """
return _scanner.scan(str)[0]
def isheader(elem):
return elem.tag in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']
class AttrListTreeprocessor(Treeprocessor):
BASE_RE = r'\{\:?([^\}\n]*)\}'
HEADER_RE = re.compile(r'[ ]+%s[ ]*$' % BASE_RE)
BLOCK_RE = re.compile(r'\n[ ]*%s[ ]*$' % BASE_RE)
INLINE_RE = re.compile(r'^%s' % 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):
for elem in doc.iter():
if isBlockLevel(elem.tag):
# Block level: check for attrs on last line of text
RE = self.BLOCK_RE
if isheader(elem) or elem.tag == 'dt':
# header or def-term: check for attrs at end of line
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 not m and elem.tag == 'td':
m = re.search(self.BASE_RE, 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, attrs):
""" 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', '%s %s' % (cls, v))
else:
elem.set('class', v)
else:
# assign attr k with v
elem.set(self.sanitize_name(k), v)
def sanitize_name(self, name):
"""
Sanitize name as 'an XML Name, minus the ":"'.
See http://www.w3.org/TR/REC-xml-names/#NT-NCName
"""
return self.NAME_RE.sub('_', name)
class AttrListExtension(Extension):
def extendMarkdown(self, md, md_globals):
md.treeprocessors.add(
'attr_list', AttrListTreeprocessor(md), '>prettify'
)
def makeExtension(*args, **kwargs):
return AttrListExtension(*args, **kwargs)
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