Mercurial > repos > shellac > sam_consensus_v3
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/env/lib/python3.9/site-packages/galaxy/util/expressions.py Mon Mar 22 18:12:50 2021 +0000 @@ -0,0 +1,57 @@ +""" +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__