49 lines
2.0 KiB
Python
49 lines
2.0 KiB
Python
from workspaceObject import WorkspaceObject
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from slipnet import slipnet
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class Letter(WorkspaceObject):
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def __init__(self, string, position, length):
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WorkspaceObject.__init__(self, string)
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from workspace import workspace
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workspace.objects += [self]
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string.objects += [self]
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self.leftIndex = position
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self.leftmost = self.leftIndex == 1
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self.rightIndex = position
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self.rightmost = self.rightIndex == length
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def describe(self, position, length):
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if length == 1:
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self.addDescription(slipnet.stringPositionCategory, slipnet.single)
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if self.leftmost and length > 1: # ? why check length ?
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self.addDescription(slipnet.stringPositionCategory, slipnet.leftmost)
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if self.rightmost and length > 1: # ? why check length ?
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self.addDescription(slipnet.stringPositionCategory, slipnet.rightmost)
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if length > 2 and position * 2 == length + 1:
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self.addDescription(slipnet.stringPositionCategory, slipnet.middle)
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def __repr__(self):
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return '<Letter: %s>' % self.__str__()
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def __str__(self):
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if not self.string:
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return ''
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i = self.leftIndex - 1
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if len(self.string) <= i:
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raise ValueError('len(self.string) <= self.leftIndex :: %d <= %d' % (len(self.string), self.leftIndex))
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return self.string[i]
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def distinguishingDescriptor(self, descriptor):
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"""Whether no other object of the same type (letter) has the same descriptor"""
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if not WorkspaceObject.distinguishingDescriptor(self, descriptor):
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return False
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for objekt in self.string.objects:
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# check to see if they are of the same type
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if isinstance(objekt, Letter) and objekt != self:
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# check all descriptions for the descriptor
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for description in objekt.descriptions:
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if description.descriptor == descriptor:
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return False
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return True
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