91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
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__all__ = ["SeqValue"]
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class SeqValue:
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""" This represents a sequence value read from a contents.xml
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file, either from the <contents> or the <package> section. It's
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represented as series of dotted integers in the xml file, and
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stored internally as a tuple of integers.
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It may be incremented, which increments only the last integer in
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the series; or it may be compared with another SeqValue, which
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compares all of the integers componentwise. """
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def __init__(self, value = None):
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self.value = ()
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if value is not None:
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self.set(value)
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def set(self, value):
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""" Sets the seq from the indicated value of unspecified
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type. """
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if isinstance(value, tuple):
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self.setFromTuple(value)
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elif isinstance(value, str):
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self.setFromString(value)
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else:
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raise TypeError('Invalid sequence type: %s' % (value,))
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def setFromTuple(self, value):
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""" Sets the seq from the indicated tuple of integers. """
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assert isinstance(value, tuple)
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self.value = value
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def setFromString(self, value):
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""" Sets the seq from the indicated string of dot-separated
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integers. Raises ValueError on error. """
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assert isinstance(value, str)
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self.value = ()
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if value:
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value = value.split('.')
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value = map(int, value)
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self.value = tuple(value)
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def loadXml(self, xelement, attribute = 'seq'):
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""" Reads the seq from the indicated XML element. Returns
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true if loaded, false if not given or if there was an
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error. """
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self.value = ()
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value = xelement.Attribute(attribute)
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if value:
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try:
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self.setFromString(value)
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except ValueError:
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return False
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return True
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return False
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def storeXml(self, xelement, attribute = 'seq'):
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""" Adds the seq to the indicated XML element. """
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if self.value:
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value = '.'.join(map(str, self.value))
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xelement.SetAttribute(attribute, value)
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def __add__(self, inc):
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""" Increments the seq value, returning the new value. """
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if not self.value:
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value = (1,)
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else:
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value = self.value[:-1] + (self.value[-1] + inc,)
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return SeqValue(value)
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def __cmp__(self, other):
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""" Compares to another seq value. """
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return cmp(self.value, other.value)
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def __lt__(self, other):
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return self.value < other.value
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def __gt__(self, other):
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return self.value > other.value
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def __bool__(self):
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return bool(self.value)
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def __str__(self):
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return 'SeqValue%s' % (repr(self.value))
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