剪辑使用字符串进行比较 [英] clips use string to make a compare condition

问题描述

对于Clips专家系统
来说我是一个非常陌生的人，我正在寻找一种用于比较以前规则中的文本的语法

I'm very very new to Clips expert system I'm looking for what is a syntax to use for compare a text from previous rules

像这样

(defrule GetGender
(declare (salience 100))
(printout t "What's your gender ? (Male/Female): ")
(bind ?response (read))
(assert (Gender (gender ?response))))

，当我从上方获得男性的答案时，我希望下面的规则有效。

and when I get answer from above like "Male" I want the rule below active.

(defrule GetShirt
(declare (salience 99))
(Gender (gender ?l))
(test (= ?l Male))
=>
(printout t "What's your shirt color ? (Blue/Black): ")
(bind ?response (read))
(assert (Shirt (shirt ?response))))

但是（test和=）似乎不是字符串比较的语法，而我英语还不够好，我什至不知道代码中的？l是什么意思

But seem (test and =) is not a syntax for string compare, and my English is not good enough, I don't even know about what "?l" in the code means

有人可以帮我解决这个问题吗？

could somebody help me to fix this out please ?

T谢谢。

推荐答案

使用=来比较数字，用eq来比较任何类型的值。在您的GetShirt规则中，标记？l是绑定到性别槽值的变量，以便可以在表达式中使用（=？l Male）。对常数进行简单比较时，无需使用测试条件元素。您可以在模式中简单地使用常量：

Use = for comparing numbers and eq for comparing values of any type. In your GetShirt rule, the token ?l is a variable that is bound to the value of the gender slot so that it can be used in the expression (= ?l Male). When making simple comparisons to constants, it's not necessary to use the test conditional element. You can simply use the constant within the pattern:

CLIPS> 
(deftemplate response
   (slot attribute)
   (slot value))
CLIPS> 
(defrule GetGender
   =>
   (printout t "What's your gender ? (Male/Female): ")
   (bind ?response (read))
   (assert (response (attribute gender) (value ?response))))
CLIPS> 
(defrule GetShirt
   (response (attribute gender) (value Male))
   =>
   (printout t "What's your shirt color ? (Blue/Black): ")
   (bind ?response (read))
   (assert (response (attribute shirt) (value ?response))))
CLIPS> (reset)
CLIPS> (run)
What's your gender ? (Male/Female): Male
What's your shirt color ? (Blue/Black): Blue
CLIPS> 

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