def load(filename):
"""Load clues from file.
:param filename: Name of the files where the clues are stored.
@type filename: C{str}
:return: Clues extracted from the file.
@rtype: C{list}
@raise InvalidFile: In case there's a problem while reinterpreting the
clues.
"""
cluefp = open(filename, 'r')
reader = csv.reader(cluefp)
clues = []
for tup in reader:
try:
count, localtime, headers = tup
except ValueError:
raise InvalidFile('Cannot unpack fields')
# Recreate the current clue.
clue = Clue()
try:
clue._count = int(count)
clue._local = float(localtime)
except ValueError:
raise InvalidFile('Could not convert fields')
# This may be risky from a security standpoint.
clue.headers = eval(headers, {}, {})
if not (isinstance(clue.headers, types.ListType) or
isinstance(clue.headers, types.TupleType)):
raise InvalidFile('Wrong clue header field')
clue.parse(clue.headers)
clues.append(clue)
cluefp.close()
return clues
