Mercurial > repos > shellac > sam_consensus_v3
view env/lib/python3.9/site-packages/galaxy/util/expressions.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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""" Expression evaluation support. For the moment this depends on python's eval. In the future it should be replaced with a "safe" parser. """ from collections.abc import MutableMapping from itertools import chain class ExpressionContext(MutableMapping): def __init__(self, dict, parent=None): """ Create a new expression context that looks for values in the container object 'dict', and falls back to 'parent' """ self.dict = dict self.parent = parent def __delitem__(self, key): if key in self.dict: del self.dict[key] elif self.parent is not None and key in self.parent: del self.parent[key] def __iter__(self): return chain(iter(self.dict), iter(self.parent or [])) def __len__(self): return len(self.dict) + len(self.parent or []) def __getitem__(self, key): if key in self.dict: return self.dict[key] if self.parent is not None and key in self.parent: return self.parent[key] raise KeyError(key) def __setitem__(self, key, value): self.dict[key] = value def __contains__(self, key): if key in self.dict: return True if self.parent is not None and key in self.parent: return True return False def __str__(self): return str(self.dict) def __bool__(self): if not self.dict and not self.parent: return False return True __nonzero__ = __bool__