"""
common utilities
"""

from zope.schema import vocabulary


class KeywordVocabulary(vocabulary.SimpleVocabulary):

    def __init__(self, items, *interfaces):
        """ ``items`` may be a tuple of (token, title) or a dictionary
            with corresponding elements named 'token' and 'title'.
        """
        terms = []
        for t in items:
            if type(t) is dict:
                token, title = t['token'], t['title']
            else:
                token, title = t
            terms.append(vocabulary.SimpleTerm(token, token, title))
        super(KeywordVocabulary, self).__init__(terms, *interfaces)