18 lines
590 B
Racket
18 lines
590 B
Racket
#lang syndicate/actor
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;; Minimal syndicate/actor variation on examples/forward-chaining.rkt.
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(actor (assert `(parent john douglas)))
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(actor (assert `(parent bob john)))
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(actor (assert `(parent ebbon bob)))
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;; This looks like an implication:
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;; (parent A C) ⇒ ((ancestor A C) ∧ ((ancestor C B) ⇒ (ancestor A B)))
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;;
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(actor (during `(parent ,$A ,$C)
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(assert `(ancestor ,A ,C))
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(during `(ancestor ,C ,$B)
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(assert `(ancestor ,A ,B)))))
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(actor (on (asserted `(ancestor ,$A ,$B))
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(log-info "~a is an ancestor of ~a" A B)))
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