取消引用剪辑中匹配事实中的槽

发布于 2024-09-12 01:06:16 字数 554 浏览 8 评论 0原文

如何取消引用规则 LHS 中匹配的事实中的槽？如果一个变量符合事实，我找不到如何创造进一步的条件该事实中的匹配槽。

例如，在下面的代码中，如果存在“(do (action ?action))”形式的事实，我想打印一些文本。然而， ?action 本身就是一个事实，我只希望当该事实的“名称”槽为“运行”时触发规则。我将如何实现这个目标？

(deftemplate do 
        (slot action) 
) 
(deftemplate action 
        (slot name) 
) 
(defrule find-do "" 
        ?do <- (do (action ?action)) 
        (test (eq ?action.name "run")) ; This causes a syntax error. 
        => 
        (printout t "doing " ?action crlf) 
) 
(deffacts startup (do (action (action (name "running")))))

原文

How do you dereference a slot in a fact matched in the LHS of a rule? If a variable
matches a fact, I can't find how to create further conditions that
match slots within that fact.

For example, in the code below, I want to print some text if there's a fact of the form "(do (action ?action))". However, ?action is itself a fact, and I only want the rule to trigger if that fact's "name" slot is "run". How would I accomplish this?

(deftemplate do 
        (slot action) 
) 
(deftemplate action 
        (slot name) 
) 
(defrule find-do "" 
        ?do <- (do (action ?action)) 
        (test (eq ?action.name "run")) ; This causes a syntax error. 
        => 
        (printout t "doing " ?action crlf) 
) 
(deffacts startup (do (action (action (name "running")))))

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郁金香雨 2024-09-19 01:06:16

搜索剪辑参考手册，我终于找到了“fact-slot-value”函数，它似乎可以满足我的要求。

(deftemplate do 
        (slot action) 
) 
(deftemplate action 
        (slot name) 
) 
(defrule find-do "" 
        ?do <- (do (action ?action)) 
        (test (eq (fact-slot-value ?action name) "run"))
        => 
        (printout t "doing " ?action crlf) 
) 
(deffacts startup (do (action (action (name "running")))))

Searching through the Clips Reference manual, I finally found the function "fact-slot-value" that seems to do what I want.

(deftemplate do 
        (slot action) 
) 
(deftemplate action 
        (slot name) 
) 
(defrule find-do "" 
        ?do <- (do (action ?action)) 
        (test (eq (fact-slot-value ?action name) "run"))
        => 
        (printout t "doing " ?action crlf) 
) 
(deffacts startup (do (action (action (name "running")))))

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