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https://github.com/SickGear/SickGear.git
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156 lines
4.7 KiB
Python
156 lines
4.7 KiB
Python
from hachoir.field import Field, FieldError
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from hachoir.stream import InputStream
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from hachoir.core.endian import BIG_ENDIAN, LITTLE_ENDIAN, MIDDLE_ENDIAN
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from hachoir.core.event_handler import EventHandler
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class ParserError(FieldError):
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"""
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Error raised by a field set.
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@see: L{FieldError}
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"""
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pass
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class MatchError(FieldError):
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"""
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Error raised by a field set when the stream content doesn't
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match to file format.
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@see: L{FieldError}
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"""
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pass
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class BasicFieldSet(Field):
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_event_handler = None
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is_field_set = True
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endian = None
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def __init__(self, parent, name, stream, description, size):
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# Sanity checks (preconditions)
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assert not parent or issubclass(parent.__class__, BasicFieldSet)
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assert issubclass(stream.__class__, InputStream)
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# Set field set size
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if size is None and self.static_size:
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assert isinstance(self.static_size, int)
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size = self.static_size
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# Set Field attributes
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self._parent = parent
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self._name = name
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self._size = size
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self._description = description
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self.stream = stream
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self._field_array_count = {}
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# Set endian
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if not self.endian:
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assert parent and parent.endian
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self.endian = parent.endian
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if parent:
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# This field set is one of the root leafs
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self._address = parent.nextFieldAddress()
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self.root = parent.root
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assert id(self.stream) == id(parent.stream)
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else:
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# This field set is the root
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self._address = 0
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self.root = self
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self._global_event_handler = None
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# Sanity checks (post-conditions)
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assert self.endian in (BIG_ENDIAN, LITTLE_ENDIAN, MIDDLE_ENDIAN)
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if (self._size is not None) and (self._size <= 0):
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raise ParserError("Invalid parser '%s' size: %s" %
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(self.path, self._size))
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def reset(self):
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self._field_array_count = {}
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def createValue(self):
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return None
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def connectEvent(self, event_name, handler, local=True):
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assert event_name in (
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# Callback prototype: def f(field)
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# Called when new value is already set
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"field-value-changed",
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# Callback prototype: def f(field)
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# Called when field size is already set
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"field-resized",
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# A new field has been inserted in the field set
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# Callback prototype: def f(index, new_field)
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"field-inserted",
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# Callback prototype: def f(old_field, new_field)
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# Called when new field is already in field set
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"field-replaced",
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# Callback prototype: def f(field, new_value)
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# Called to ask to set new value
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"set-field-value"
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), "Event name %r is invalid" % event_name
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if local:
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if self._event_handler is None:
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self._event_handler = EventHandler()
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self._event_handler.connect(event_name, handler)
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else:
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if self.root._global_event_handler is None:
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self.root._global_event_handler = EventHandler()
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self.root._global_event_handler.connect(event_name, handler)
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def raiseEvent(self, event_name, *args):
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# Transfer event to local listeners
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if self._event_handler is not None:
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self._event_handler.raiseEvent(event_name, *args)
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# Transfer event to global listeners
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if self.root._global_event_handler is not None:
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self.root._global_event_handler.raiseEvent(event_name, *args)
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def setUniqueFieldName(self, field):
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key = field._name[:-2]
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try:
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self._field_array_count[key] += 1
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except KeyError:
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self._field_array_count[key] = 0
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field._name = key + "[%u]" % self._field_array_count[key]
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def readFirstFields(self, number):
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"""
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Read first number fields if they are not read yet.
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Returns number of new added fields.
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"""
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number = number - self.current_length
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if 0 < number:
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return self.readMoreFields(number)
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else:
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return 0
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def createFields(self):
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raise NotImplementedError()
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def __iter__(self):
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raise NotImplementedError()
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def __len__(self):
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raise NotImplementedError()
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def getField(self, key, const=True):
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raise NotImplementedError()
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def nextFieldAddress(self):
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raise NotImplementedError()
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def getFieldIndex(self, field):
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raise NotImplementedError()
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def readMoreFields(self, number):
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raise NotImplementedError()
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