# markdown is released under the BSD license
# Copyright 2007, 2008 The Python Markdown Project (v. 1.7 and later)
# Copyright 2004, 2005, 2006 Yuri Takhteyev (v. 0.2-1.6b)
# Copyright 2004 Manfred Stienstra (the original version)
# 
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
# *   Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
# *   Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
# *   Neither the name of the <organization> nor the
#     names of its contributors may be used to endorse or promote products
#     derived from this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE PYTHON MARKDOWN PROJECT ''AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# DISCLAIMED. IN NO EVENT SHALL ANY CONTRIBUTORS TO THE PYTHON MARKDOWN PROJECT
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"""
Sane List Extension for Python-Markdown
=======================================

Modify the behavior of Lists in Python-Markdown t act in a sane manor.

In standard Markdown sytex, the following would constitute a single 
ordered list. However, with this extension, the output would include 
two lists, the first an ordered list and the second and unordered list.

    1. ordered
    2. list

    * unordered
    * list

Copyright 2011 - [Waylan Limberg](http://achinghead.com)

"""

from __future__ import absolute_import
from __future__ import unicode_literals
from . import Extension
from ..blockprocessors import OListProcessor, UListProcessor
import re


class SaneOListProcessor(OListProcessor):
    
    CHILD_RE = re.compile(r'^[ ]{0,3}((\d+\.))[ ]+(.*)')
    SIBLING_TAGS = ['ol']


class SaneUListProcessor(UListProcessor):
    
    CHILD_RE = re.compile(r'^[ ]{0,3}(([*+-]))[ ]+(.*)')
    SIBLING_TAGS = ['ul']


class SaneListExtension(Extension):
    """ Add sane lists to Markdown. """

    def extendMarkdown(self, md, md_globals):
        """ Override existing Processors. """
        md.parser.blockprocessors['olist'] = SaneOListProcessor(md.parser)
        md.parser.blockprocessors['ulist'] = SaneUListProcessor(md.parser)


def makeExtension(configs={}):
    return SaneListExtension(configs=configs)