mirror of
https://github.com/SickGear/SickGear.git
synced 2024-11-22 04:45:05 +00:00
55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
|
from hachoir.field import FieldSet, ParserError
|
||
|
|
|
||
|
|
|
||
|
|
class StaticFieldSet(FieldSet):
|
||
|
|
"""
|
||
|
|
Static field set: format class attribute is a tuple of all fields
|
||
|
|
in syntax like:
|
||
|
|
format = (
|
||
|
|
(TYPE1, ARG1, ARG2, ...),
|
||
|
|
(TYPE2, ARG1, ARG2, ..., {KEY1=VALUE1, ...}),
|
||
|
|
...
|
||
|
|
)
|
||
|
|
|
||
|
|
Types with dynamic size are forbidden, eg. CString, PascalString8, etc.
|
||
|
|
"""
|
||
|
|
format = None # You have to redefine this class variable
|
||
|
|
_class = None
|
||
|
|
|
||
|
|
def __new__(cls, *args, **kw):
|
||
|
|
assert cls.format is not None, "Class attribute 'format' is not set"
|
||
|
|
if cls._class is not cls.__name__:
|
||
|
|
cls._class = cls.__name__
|
||
|
|
cls.static_size = cls._computeStaticSize()
|
||
|
|
return object.__new__(cls)
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def _computeItemSize(item):
|
||
|
|
item_class = item[0]
|
||
|
|
if item_class.static_size is None:
|
||
|
|
raise ParserError("Unable to get static size of field type: %s"
|
||
|
|
% item_class.__name__)
|
||
|
|
if callable(item_class.static_size):
|
||
|
|
if isinstance(item[-1], dict):
|
||
|
|
return item_class.static_size(*item[1:-1], **item[-1])
|
||
|
|
else:
|
||
|
|
return item_class.static_size(*item[1:])
|
||
|
|
else:
|
||
|
|
assert isinstance(item_class.static_size, int)
|
||
|
|
return item_class.static_size
|
||
|
|
|
||
|
|
def createFields(self):
|
||
|
|
for item in self.format:
|
||
|
|
if isinstance(item[-1], dict):
|
||
|
|
yield item[0](self, *item[1:-1], **item[-1])
|
||
|
|
else:
|
||
|
|
yield item[0](self, *item[1:])
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _computeStaticSize(cls, *args):
|
||
|
|
return sum(cls._computeItemSize(item) for item in cls.format)
|
||
|
|
|
||
|
|
# Initial value of static_size, it changes when first instance
|
||
|
|
# is created (see __new__)
|
||
|
|
static_size = _computeStaticSize
|