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enko/teaser.py

Created February 20, 2012 15:25
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teaser behavior
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teaser.py
"""Behavior to automaticly create a teaser
Checks the description, if nothing is entered, we will generate something from the body.
"""
from rwproperty import getproperty, setproperty
from zope.interface import implements, alsoProvides
from zope.component import adapts
from plone.directives import form
from Products.CMFCore.interfaces import IDublinCore
import nltk.data
class ITeaser(form.Schema):
pass
class Teaser(object):
implements(ITeaser)
teaser_size = 200
def __init__(self, context):
self.context = context
self.context.teaser = self.teaser
@getproperty
def teaser(self):
if (len(self.context.description) > 0):
return self.context.description
else:
self.context.body._outputMimeType = 'text/plain'
text = self.context.body.output
tokenizer = nltk.data.load('tokenizers/punkt/german.pickle')
tokens = tokenizer.tokenize(text)
retval = ''
for token in tokens:
if (len(retval) == 0):
retval = token
else:
if ((len(retval) + len(token)) < self.teaser_size):
retval = "%s %s" % (retval,token)
else:
break
return retval
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