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import types
"""The behavior query system is a module that allows querying behaviors based on lambda-function
predicates."""
def initBQS():
global behaviorList, initialized
behaviorList = []
initialized = True
def addBehavior(behavior):
"""Add a behavior to the behavior registry."""
behaviorList.append(behavior)
def query(predicateList):
"""BehaviorQuerySystem.query takes a list of predicates (functions with signature:
(behavior,output)), and
optionally a behavior to be compared to."""
#want to do queries wrt: behavior itself, the behavior packet, the querying behavior
if isinstance(predicateList, types.FunctionType):
predicateList = [predicateList]
elif not isinstance(predicateList, list):
raise Exception('Predicate list must be a function or list of functions')
global behaviorList, initialized
ret = []
if not initialized:
initBQS()
for behavior in behaviorList: #Consider every behavior
lastOutput = behavior.getLastOutput()
for output in lastOutput: #Look at every element it has output
validOutput = True
for pred in predicateList: #Evaluate every predicate. A predicate is a lambda function that
#takes a dict and returns a bool.
if not pred(output):
validOutput = False
break
if validOutput:
ret.append(output)
return ret
def getDistLambda(loc, maxDist):
"""Returns a lambda function that checks if for behaviors within maxDist of loc. Can be passed
in as an arg to query."""
return lambda args:geo.dist(args['Location'], loc) <= maxDist
def getBehaviorsNear(loc, maxdist):
"""A premade method to do the common task of finding behavior near a location."""
return query(getDistLambda(loc, maxDist))
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