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annotate roundup/support.py @ 3536:00a7983b4666

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author Richard Jones <richard@users.sourceforge.net>
date Fri, 03 Feb 2006 04:12:36 +0000
parents a2ae11191968
children 5cd1c83dea50
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1 """Implements various support classes and functions used in a number of
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2 places in Roundup code.
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3 """
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4
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5 __docformat__ = 'restructuredtext'
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6
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7 import os
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8
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9 class TruthDict:
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10 '''Returns True for valid keys, False for others.
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11 '''
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12 def __init__(self, keys):
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13 if keys:
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14 self.keys = {}
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15 for col in keys:
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16 self.keys[col] = 1
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17 else:
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18 self.__getitem__ = lambda name: 1
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19
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20 def __getitem__(self, name):
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21 return self.keys.has_key(name)
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22
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23 def ensureParentsExist(dest):
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24 if not os.path.exists(os.path.dirname(dest)):
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25 os.makedirs(os.path.dirname(dest))
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26
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27 class PrioList:
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28 '''Manages a sorted list.
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29
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30 Currently only implements method 'append' and iteration from a
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31 full list interface.
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32 Implementation: We manage a "sorted" status and sort on demand.
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33 Appending to the list will require re-sorting before use.
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34 >>> p = PrioList ()
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35 >>> for i in 5,7,1,-1 :
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36 ... p.append (i)
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37 ...
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38 >>> for k in p :
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39 ... print k
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40 ...
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41 -1
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42 1
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43 5
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44 7
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45
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46 '''
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47 def __init__(self):
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48 self.list = []
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49 self.sorted = True
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50
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51 def append(self, item):
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52 self.list.append (item)
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53 self.sorted = False
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54
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55 def __iter__(self):
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56 if not self.sorted :
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57 self.list.sort ()
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58 self.sorted = True
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59 return iter (self.list)
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60
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61 # vim: set et sts=4 sw=4 :
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