def seteval(str_, get=None, stemmer=None, target=None):
"""Evaluate a set operation string, where each Name is fetched
Parameters
----------
str_ : str
The query to evaluate
get : function, optional
A getting method, defaults to instatiating one from _requests
stemmer : function, optional
A method to stem a query Name. If None, defaults to passthrough.
target : str, optional
A subcontext to query against. If None, defaults to text-search.
"""
if get is None:
import redbiom
config = redbiom.get_config()
get = redbiom._requests.make_get(config)
if stemmer is None:
stemmer = passthrough
if target is None:
target = 'text-search'
# Load is subject to indirection to simplify testing
globals()['Load'] = make_Load(get)
# this seems right now to be the easiest way to inject parameters
# into Name
globals()['stemmer'] = stemmer
globals()['target'] = target
formed = ast.parse(str_, mode='eval')
node_types = (ast.BitAnd, ast.BitOr, ast.BitXor, ast.Name, ast.Sub,
ast.Expression, ast.BinOp, ast.Load)
for node in ast.walk(formed):
if not isinstance(node, node_types):
raise TypeError("Unsupported node type: %s" % ast.dump(node))
result = eval(ast.dump(formed))
# clean up
global Load
del Load
del stemmer
del target
return result
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