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smart spaceless

Author:
nedbatchelder
Posted:
February 26, 2008
Language:
Python
Version:
.96
Score:
2 (after 2 ratings)

Just like {% spaceless %}, except a single space is preserved between two inline tags (such as <a>, <em>, and so on). This lets you use the tag on running text without fear of running two spans of styled text together incorrectly. 

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@register.tag
def smartspaceless(parser, token):
    nodelist = parser.parse(('endsmartspaceless',))
    parser.delete_first_token()
    return SmartSpacelessNode(nodelist)

class SmartSpacelessNode(Node):
    def __init__(self, nodelist):
        self.nodelist = nodelist

    def render(self, context):
        s = self.nodelist.render(context).strip()
        inline_tags = 'a|b|i|u|em|strong|sup|sub|tt|font|small|big'
        inlines_with_spaces = r'</(%s)>\s+<(%s)\b' % (inline_tags, inline_tags)
        s = re.sub(inlines_with_spaces, r'</\1>&#preservespace;<\2', s)
        s = re.sub(r'>\s+<', '><', s)
        s = s.replace('&#preservespace;', ' ')
        return s

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Comments

johnboxall (on October 6, 2010):

Had the same problem - ended up using something similar with a single pass regex:

import re

spaces_re = re.compile(r'>\s{2,}<')

def sane_spaces(value):
    return spaces_re.sub('> <', force_unicode(value))
sane_spaces = allow_lazy(sane_spaces, unicode)

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