Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/galaxy/util/expressions.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 """
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2 Expression evaluation support.
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3
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4 For the moment this depends on python's eval. In the future it should be
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5 replaced with a "safe" parser.
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6 """
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7
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8 from collections import MutableMapping
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9 from itertools import chain
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10
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11
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12 class ExpressionContext(MutableMapping):
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13 def __init__(self, dict, parent=None):
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14 """
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15 Create a new expression context that looks for values in the
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16 container object 'dict', and falls back to 'parent'
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17 """
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18 self.dict = dict
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19 self.parent = parent
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20
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21 def __delitem__(self, key):
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22 if key in self.dict:
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23 del self.dict[key]
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24 elif self.parent is not None and key in self.parent:
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25 del self.parent[key]
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26
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27 def __iter__(self):
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28 return chain(iter(self.dict), iter(self.parent or []))
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29
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30 def __len__(self):
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31 return len(self.dict) + len(self.parent or [])
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32
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33 def __getitem__(self, key):
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34 if key in self.dict:
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35 return self.dict[key]
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36 if self.parent is not None and key in self.parent:
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37 return self.parent[key]
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38 raise KeyError(key)
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39
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40 def __setitem__(self, key, value):
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41 self.dict[key] = value
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42
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43 def __contains__(self, key):
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44 if key in self.dict:
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45 return True
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46 if self.parent is not None and key in self.parent:
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47 return True
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48 return False
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49
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50 def __str__(self):
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51 return str(self.dict)
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52
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53 def __bool__(self):
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54 if not self.dict and not self.parent:
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55 return False
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56 return True
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57 __nonzero__ = __bool__