Function expand

17-it-generator/isis2json/subfield.py:29–53

Parse a field into an association list of keys and subfields >>> expand('zero^1one^2two^3three') [('_', 'zero'), ('1', 'one'), ('2', 'two'), ('3', 'three')]

(content, subkeys=None)

DEFAULT_ENCODING = u'utf-8'

def expand(content, subkeys=None):
    ''' Parse a field into an association list of keys and subfields

        >>> expand('zero^1one^2two^3three')
        [('_', 'zero'), ('1', 'one'), ('2', 'two'), ('3', 'three')]

    '''
    if subkeys is None:
        regex = SUBFIELD_MARKER_RE
    elif subkeys == '':
        return [(MAIN_SUBFIELD_KEY, content)]
    else:
        regex = re.compile(r'\^(['+subkeys+'])', re.IGNORECASE)
    content = content.replace('^^', '^^ ')
    parts = []
    start = 0
    key = MAIN_SUBFIELD_KEY
    while True:
        found = regex.search(content, start)
        if found is None: break
        parts.append((key, content[start:found.start()].rstrip()))
        key = found.group(1).lower()
        start = found.end()
    parts.append((key, content[start:].rstrip()))
    return parts


class CompositeString(object):