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annotate piecrust/data/base.py @ 901:1d5f02778723

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internal: PEP8
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 23 Jul 2017 08:22:03 -0700
parents d446029c9478
children 8adc27285d93
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1 import collections.abc
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4 class MergedMapping(collections.abc.Mapping):
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5 """ Provides a dictionary-like object that's really the aggregation of
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6 multiple dictionary-like objects.
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7 """
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8 def __init__(self, dicts, path=''):
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9 self._dicts = dicts
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10 self._path = path
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12 def __getattr__(self, name):
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13 try:
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14 return self[name]
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15 except KeyError:
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16 raise AttributeError("No such attribute: %s" % self._subp(name))
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18 def __getitem__(self, name):
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19 values = []
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20 for d in self._dicts:
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21 try:
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22 val = getattr(d, name)
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23 values.append(val)
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24 continue
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25 except AttributeError:
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26 pass
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28 try:
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29 val = d[name]
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30 values.append(val)
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31 continue
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32 except KeyError:
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33 pass
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35 if len(values) == 0:
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36 raise KeyError("No such item: %s" % self._subp(name))
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37 if len(values) == 1:
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38 return values[0]
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40 for val in values:
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41 if not isinstance(val, (dict, collections.abc.Mapping)):
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42 raise Exception(
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43 "Template data for '%s' contains an incompatible mix "
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44 "of data: %s" % (
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45 self._subp(name),
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46 ', '.join([str(type(v)) for v in values])))
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48 return MergedMapping(values, self._subp(name))
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50 def __iter__(self):
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51 keys = set()
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52 for d in self._dicts:
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53 keys |= set(d.keys())
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54 return iter(keys)
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56 def __len__(self):
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57 keys = set()
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58 for d in self._dicts:
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59 keys |= set(d.keys())
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60 return len(keys)
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62 def _subp(self, name):
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63 return '%s/%s' % (self._path, name)
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65 def _prependMapping(self, d):
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66 self._dicts.insert(0, d)
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68 def _appendMapping(self, d):
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69 self._dicts.append(d)
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