从Clojure core.logic中提取映射元素
我正在尝试使用Clojure core.logic从地图中提取数据。此代码按照我的要求执行:从Clojure core.logic中提取映射元素,clojure,clojure-core.logic,Clojure,Clojure Core.logic,我正在尝试使用Clojure core.logic从地图中提取数据。此代码按照我的要求执行: (run 10 [q] (fresh [?id ?type ?name] (membero ?type [:t2 :t1]) (== q [?id ?name]) (membero {:id ?id :type ?type :name ?name} [ {:id 1 :type :t1 :name "one"
(run 10 [q]
(fresh [?id ?type ?name]
(membero ?type [:t2 :t1])
(== q [?id ?name])
(membero {:id ?id :type ?type :name ?name}
[
{:id 1 :type :t1 :name "one"}
{:id 2 :type :t2 :name "two"}
])))
=> ([2 "two"] [1 "one"])
但是,如果我在地图中添加了一些其他元素,那么它将无法匹配:
(run 10 [q]
(fresh [?id ?type ?name]
(membero ?type [:t2 :t1])
(== q [?id ?name])
(membero {:id ?id :type ?type :name ?name}
[
{:id 1 :type :t1 :name "one" :other1 :o1}
{:id 2 :type :t2 :name "two" :other2 :o2}
])))
我理解为什么matche
不起作用,因为地图已经不一样了。我的问题是,我怎样才能改变它,使它再次工作?如何使其仅与地图中的某些关键点匹配,或者如何使其与地图中的任意随机关键点匹配
编辑:
我使用空间地图
(感谢)
但是我发现应该使用
featurec
而不是partial map
。我的新问题:如何将其更改为使用featurec
?回答我自己的问题:
以下是工作代码:
(run 10 [q]
(fresh [?id ?type ?name ?pm]
(membero ?type [:t2 :t1])
(== q [?id ?name])
(featurec ?pm {:id ?id :type ?type :name ?name} )
(membero ?pm
[
{:id 1 :type :t1 :name "one" :other1 :o2}
{:id 2 :type :t2 :name "two" :other2 :o1 :another :ao2}
{:id 3 :type :t3 :name "three" :other2 :o1 :another :ao1}
]))))
这段代码允许我从映射中提取值,但只关注真正重要的键。其余的键值对将被忽略。我添加了我使用的测试代码要点:
(run 10 [q]
(fresh [?id ?type ?name ?pm]
(membero ?type [:t2 :t1])
(== q [?id ?name])
(featurec ?pm {:id ?id :type ?type :name ?name} )
(membero ?pm
[
{:id 1 :type :t1 :name "one" :other1 :o2}
{:id 2 :type :t2 :name "two" :other2 :o1 :another :ao2}
{:id 3 :type :t3 :name "three" :other2 :o1 :another :ao1}
]))))