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82 lines
2.2 KiB
Python
82 lines
2.2 KiB
Python
import itertools
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from hachoir.field import MissingField
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class FakeArray:
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"""
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Simulate an array for GenericFieldSet.array(): fielset.array("item")[0] is
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equivalent to fielset.array("item[0]").
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It's possible to iterate over the items using::
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for element in fieldset.array("item"):
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...
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And to get array size using len(fieldset.array("item")).
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"""
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def __init__(self, fieldset, name):
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pos = name.rfind("/")
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if pos != -1:
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self.fieldset = fieldset[name[:pos]]
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self.name = name[pos + 1:]
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else:
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self.fieldset = fieldset
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self.name = name
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self._format = "%s[%%u]" % self.name
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self._cache = {}
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self._known_size = False
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self._max_index = -1
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def __bool__(self):
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"Is the array empty or not?"
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if self._cache:
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return True
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else:
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return (0 in self)
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def __len__(self):
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"Number of fields in the array"
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total = self._max_index + 1
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if not self._known_size:
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for index in itertools.count(total):
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try:
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self[index]
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total += 1
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except MissingField:
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break
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return total
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def __contains__(self, index):
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try:
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self[index]
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return True
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except MissingField:
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return False
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def __getitem__(self, index):
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"""
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Get a field of the array. Returns a field, or raise MissingField
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exception if the field doesn't exist.
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"""
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try:
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value = self._cache[index]
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except KeyError:
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try:
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value = self.fieldset[self._format % index]
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except MissingField:
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self._known_size = True
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raise
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self._cache[index] = value
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self._max_index = max(index, self._max_index)
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return value
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def __iter__(self):
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"""
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Iterate in the fields in their index order: field[0], field[1], ...
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"""
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for index in itertools.count(0):
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try:
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yield self[index]
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except MissingField:
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break
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