Comments (4)
Apologies for the late reply.
This is the intended usage, if you want to pass an instance name, you need to cast it as such with the InstanceName
class.
All CLIPSPy objects return strings in place of names and such. There is ambiguity between a CLIPS symbol and a CLIPS string which is very similar as for Lisp languages (usually solved using quoting '
). Unfortunately, there is little we can do with that.
Adding convenience methods all around would complicate the API (lots more code, documentation and tests) with little added value.
After all:
instance = defclass.make_instance(
"second_name", firstCl=first_instance.instance_name
)
Is not much shorter than:
instance = defclass.make_instance(
"second_name", firstCl=InstanceName(first_instance.name)
)
With the difference that the former, requires the developer to know that instance_name
returns a specific type, the latter makes it clear there is a type casting in place.
In my opinion, the latter form is preferable as more Pythonic: simple and clear.
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Hello,
I'm not quite sure I understand the question. Instances are not created from the Python object but through the related class make_instance
as per the example in the documentation.
Python objects such as Class
Instance
or Fact
are not meant to be used directly within the code base.
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Hi there,
I wrote an example (which ended up a bit lengthy) to demonstrate what I mean:
import clips
env = clips.Environment()
first_class = """
(defclass FirstClass
(is-a USER)
(role concrete)
(pattern-match reactive)
(slot One)
(slot Two))
"""
second_class = """
(defclass SecondClass
(is-a USER)
(role concrete)
(pattern-match reactive)
(slot firstCl)
"""
rule = """
(defrule my-rule
(object (is-a FirstClass)
(name ?first_class_name)
(object (is-a SecondClass)
(firstCl ?first_instance)
(test (eq ?first_class_name ?first_instance))
=>
(printout t "My Rule fired!" crlf))
"""
env.build(first_class)
env.build(second_class)
env.build(rule)
defclass = env.find_class("FirstClass")
first_instance = defclass.make_instance("first_name", One=1, Two=2)
defclass = env.find_class("SecondClass")
instance = defclass.make_instance(
"second_name", firstCl=first_instance
) # This way the rule will not get activated
If I change the last lines of the code to
from clips import InstanceName
instance = defclass.make_instance(
"second_name", firstCl=InstanceName(first_instance.name)
) # This way the rule will activate
the rule will fire. Hence why I proposed a convenience property like instance_name
in my first comment, that way it is clearer for the user when the instance data is used and how to use the instance symbol, which is often needed in rules. I hope that can clear the intention described in the first comment.
Kind regards
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Thank you for the reply. I think that then clears my question/proposal.
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