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import re
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from django.shortcuts import get_object_or_404
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from django import template
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from django.utils.text import re_tag
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from django.core.urlresolvers import reverse
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from boards.mdx_neboard import LINE_BREAK_HTML
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from boards import settings
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IMG_ACTION_URL = '[<a href="{}">{}</a>]'
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REGEX_NEWLINE = re.compile(LINE_BREAK_HTML)
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TRUNCATOR = '...'
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HTML4_SINGLETS =(
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'br', 'col', 'link', 'base', 'img', 'param', 'area', 'hr', 'input'
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)
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register = template.Library()
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@register.simple_tag(name='post_url')
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def post_url(*args, **kwargs):
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post_id = args[0]
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post = get_object_or_404('Post', id=post_id)
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return post.get_absolute_url()
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@register.inclusion_tag('boards/post.html', name='post_view', takes_context=True)
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def post_view(context, post, *args, **kwargs):
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kwargs['perms'] = context['perms']
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return post.get_view_params(*args, **kwargs)
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@register.simple_tag(name='page_url')
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def page_url(paginator, page_number, *args, **kwargs):
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if paginator.supports_urls():
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return paginator.get_page_url(page_number)
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@register.filter(name='truncatenewlines_html')
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def truncatenewlines_html(value, arg):
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end_pos = 0
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start_pos = 0
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match_count = 0
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# Collect places for truncation
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while match_count <= arg:
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m = REGEX_NEWLINE.search(value, end_pos)
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if m is None:
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break
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else:
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match_count += 1
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end_pos = m.end()
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start_pos = m.start()
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# Find and close open tags
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if match_count > arg:
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truncate_pos = start_pos
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open_tags = []
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text = value[:truncate_pos]
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current_pos = 0
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while True:
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tag = re_tag.search(text, current_pos)
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if tag is None:
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break
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else:
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closing_tag, tagname, self_closing = tag.groups()
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tagname = tagname.lower()
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if self_closing or tagname in HTML4_SINGLETS:
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pass
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elif closing_tag:
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# Check for match in open tags list
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try:
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i = open_tags.index(tagname)
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except ValueError:
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pass
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else:
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# SGML: An end tag closes, back to the matching start tag,
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# all unclosed intervening start tags with omitted end tags
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open_tags = open_tags[i + 1:]
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else:
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# Add it to the start of the open tags list
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open_tags.insert(0, tagname)
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current_pos = tag.end()
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if not text.endswith(TRUNCATOR):
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text += TRUNCATOR
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for tag in open_tags:
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text += '</{}>'.format(tag)
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else:
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text = value
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return text
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