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/target
/classes
/checkouts
profiles.clj
pom.xml
pom.xml.asc
*~
*.jar
*.class
/.lein-*
/.nrepl-port
/.prepl-port
.hgignore
.hg/
.clj-kondo/
.lsp/
.portal/
.calva/output-window/output.calva-repl
dengine.code-workspace

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# Change Log
All notable changes to this project will be documented in this file. This change log follows the conventions of [keepachangelog.com](http://keepachangelog.com/).
## [Unreleased]
### Changed
- Add a new arity to `make-widget-async` to provide a different widget shape.
## [0.1.1] - 2025-08-03
### Changed
- Documentation on how to make the widgets.
### Removed
- `make-widget-sync` - we're all async, all the time.
### Fixed
- Fixed widget maker to keep working when daylight savings switches over.
## 0.1.0 - 2025-08-03
### Added
- Files from the new template.
- Widget maker public API - `make-widget-sync`.
[Unreleased]: https://sourcehost.site/your-name/dengine/compare/0.1.1...HEAD
[0.1.1]: https://sourcehost.site/your-name/dengine/compare/0.1.0...0.1.1

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# Introduction to dengine
TODO: write [great documentation](http://jacobian.org/writing/what-to-write/)

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(defproject dengine "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
:url "https://www.eclipse.org/legal/epl-2.0/"}
:dependencies [[org.clojure/clojure "1.11.1"]
[org.clojure/clojure "1.12.0"]]
:repl-options {:init-ns arboretum.dengine.core})

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(ns arboretum.dengine.case
(:require [arboretum.dengine.protocols :refer [Case]]))
(defrecord CaseImpl [ id name knowledge]
Case
(id [this] :foo);;(:id this))
(name [this] "foo") ;;(or (:name this) (clojure.core/name (:id this))))
(knowledge [this] (:knowledge this))
(is? [this feature-id] ((:knowledge this) feature-id))
)

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(ns arboretum.dengine.core
;; (:require [arboretum.dengine.feature :refer [decide explain]]
;; [arboretum.dengine.protocols :refer [proposition]])
)
(defn foo
"I don't do a whole lot."
[x]
(println x "Hello, World!"))
;; (defn is?
;; [feature case kb]
;; (let [evaluation (decide feature case kb)]
;; ((proposition feature) evaluation)))

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(ns arboretum.dengine.feature
(:require [arboretum.dengine.kb :refer [!kb]]
[arboretum.dengine.protocols :refer [Case Feature Node]]
[arboretum.dengine.utils :refer [string->keyword]]
[clojure.spec.alpha :as spec]))
(spec/def :arboretum.dengine.feature/name string?)
(spec/def :arboretum.dengine.feature/default boolean?)
(defn- dengine [this c]
(let [c' (if (satisfies? Case c) c (-> @!kb :cases c))]
(when (nil? c') (throw (ex-info "Unknown or invalid case"
{:case-identifier c})))
(if (:rootnode this)
(when-not (satisfies? Node (:rootnode this))
(throw (ex-info "Invalid DTree node"
{:node (:rootnode this)
:context this})))
(first
(filter boolean?
(map #(.evaluate % c)
(-> this :rootnode :children)))))))
(defrecord FeatureImpl [^String proposition ^boolean default rootnode]
Feature
(decide [this c] (let [v ((.id this) c)]
(cond (boolean? v) v
(:rootnode this) (dengine (:rootnode this) c)
:else (:default this))))
(default [this] (:default this))
(id [this] (string->keyword (:proposition this)))
(rootnode [this] (:rootnode this))
(proposition [this] (:proposition this)))

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(ns arboretum.dengine.kb
(:require
arboretum.dengine.case
[arboretum.dengine.protocols :refer [Case Feature Kb]]
[arboretum.dengine.utils :refer [string->keyword]]
[clojure.pprint :refer [pprint]])
(:import
[arboretum.dengine.case CaseImpl]))
(defrecord KBImpl [cases features]
Kb
(cases [this] (:cases this))
(features [this] (:features this))
(get-case [this case-id] (-> this :cases case-id))
(get-feature [this feature-id] (-> this :features feature-id))
(is? [this case-or-id feature-or-id]
(let [c (if (satisfies? Case case-or-id)
case-or-id (-> this :cases case-or-id))
f (if (satisfies? Feature feature-or-id) feature-or-id
(-> this :features feature-or-id))]
(-> c (:id f)))))
(def !kb
"The one instance of the knowledge base."
(atom (KBImpl. nil nil)))
(defn add-case
"Add a case to the knowledge base with this `name`, and, if supplied, this `id`."
([^String name]
(add-case name (string->keyword name (map :id (.cases @!kb)))))
([^String name ^clojure.lang.Keyword id]
(let [c (CaseImpl. id name {})]
(swap! !kb update-in :cases conj c))))
(defn persist [filepath]
(let [p (if (empty? filepath) "kb.edn" filepath)]
(spit p (with-out-str (pprint @!kb)))))
(defn restore [filepath]
(let [p (if (empty? filepath) "kb.edn" filepath)
kb (read-string (slurp p))]
(if (satisfies? Kb kb) (reset! !kb kb)
(throw (ex-info "Not a knowledge base?" {:filepath filepath
:kb kb
:type (type kb)})))))

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(ns arboretum.dengine.node
(:require [arboretum.dengine.protocols :refer [Node]]
[clojure.spec.alpha :as spec]))
(defrecord NodeImpl [children ^Boolean colour feature ^String fragment]
Node
(children [this] "The children of this node" (:children this))
(colour ^Boolean [this] "The colour of this node" (:colour this))
(feature [this] "The feature at this node" (:feature this))
(fragment ^String [this] "The explanation fragment at this node")
(evaluate [this case-id] )
)

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(ns arboretum.dengine.protocols
(:require [clojure.spec.alpha :as spec]))
;;(declare node?)
;; Design problem here is that the structure of a feature optionally contains
;; a node, and the structure of a node necessarily containt a feature; but two
;; clojure namespaces cannot depend on one another.
(defprotocol Case
"A case to be decided. It represents an object-in-the-world about
which knowledge may be held and enquiries may be made."
(id ^Keyword [this] "Returns the `:id` of this case.")
(name ^String [this] "Returns the name associated with this case")
(knowledge ^APersistentMap [this] "Returns a map whose keys are ids of features
and whose values are the values of those
features in this case.")
(is? ^Boolean [this feature-id] "Returns `true` if feature-id true of `this`,
`false` if it's definitely not true, and
`nil` if its truth value is unknown."))
(defmacro case?
"Return `true` if this `obj` appears to be a valid case.
**NOTE THAT** this does not verify that every key is the id of some feature
konwn to the knowledge base."
[obj]
`(satisfies? Case ~obj))
(defprotocol Feature
"A feature has three essential elements: a proposition, a default value, and
a method of decision"
(decide ^Boolean [this case] "Returns the default value of my proposition for this `case`.
`case` should be either an object which satisfies the `Case`
protocol or else a keyword, in which case it should be the
key of some case in the global `kb`.")
(default ^Boolean [this] "Returns the default value of my proposition")
(id ^Keyword [this] "Returns a keywordised representation of the proposition of this feature")
(proposition ^String [this] "Returns the proposition associated with this feature")
(rootnode [this] "Returns the root node of the dtree for this feature, if one exists, else `nil`"))
(defmacro feature?
[obj]
`(satisfies? Feature ~obj))
(defprotocol Kb
;; "The knowledge base"
(get-case ^APersistentMap [this ^Keyword id]
"Return the case with this `id` from among my cases,
if present, else `nil`")
(cases ^APersistentMap [this]
"All cases known in this knowledge base, keyed by `:id`")
(get-feature ^APersistentMap [this id-or-prop]
"Return the feature with this `id` from among my features,
if present, else `nil`")
(features ^APersistentMap [this]
"All features known in this knowledge base, keyed by `:proposition`")
(is? ^Boolean [this case-or-id feature-or-id]
"Is the feature identified by `feature-or-id` true of the case identified
by `case-or-id?"))
(defprotocol Node
"A node in a DTree"
(children [this] "The children of this node")
(colour ^Boolean [this] "The colour of this node")
(feature [this] "The feature at this node")
(fragment ^String [this] "The explanation fragment at this node")
(evaluate [this case-id] "evaluate this node in the context of the case identified by `case-id`.")
(explain [this case-id] "return an explanation from this node or its children for the case identified by `case-id`"))

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(ns arboretum.dengine.utils
(:require
[clojure.string :refer [lower-case replace]])
(:import
[clojure.lang PersistentHashSet]))
(defn string->keyword
"Produce a keyword based on this `s`. If `others` are supplied, the return
value will be different from any of those others."
([^String s]
(let [x (replace
(replace (lower-case s) #"[^]a-z0-9- ]" "")
#" " "-")]
(keyword (if (empty? x) (gensym) x))))
([^String s ^PersistentHashSet others]
(let [c (string->keyword s)]
(if (others c) (keyword (gensym (name c))) c))))

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(ns dengine.feature-test
(:require [clojure.test :refer [deftest is testing]]
[arboretum.dengine.feature :refer :all])
(:import [arboretum.dengine.feature FeatureImpl]))
(deftest feature-impl-test
(testing "Testing feature implementation"
(let [f (FeatureImpl. "Is entitled to Widow's Allowance" false nil)]
(let [expected :is-entitled-to-widows-allowance
actual (.id f)]
(is (= actual expected)))
(let [expected false
actual (.default f)]
(is (= actual expected)))
(let [expected false
actual (.decide f {})]
(is (= actual expected) "If we have no knoledge and no decision method, take the defualt."))
(let [expected false
actual (.decide f {:is-entitled-to-widows-benefit true})]
(is (= actual expected) "If we have knoledge, return it.")))))

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(ns dengine.kb-test
(:require [clojure.test :refer [deftest is testing]]
arboretum.dengine.case
arboretum.dengine.feature
[arboretum.dengine.kb :refer :all])
(:import [arboretum.dengine.case CaseImpl]
[arboretum.dengine.feature FeatureImpl]
[arboretum.dengine.kb KBImpl]))
(def testkb (KBImpl. [(CaseImpl. :case_1 "Mrs Nora Trellis" {:married true :divorced false})]
[(FeatureImpl. "is entitled to Widow's Benefit" false nil)]))
(reset! !kb testkb)
(deftest access-test
(testing "Accessing knowledge in the knowledge base"
(let [expected nil
actual (.is? testkb :case_1 :widowed)]
(is (= actual expected)))
(let [expected true
actual (.is? testkb :case_1 :married)]
(is (= actual expected)))
(let [expected false
actual (.is? testkb :case_1 :divorced)]
(is (= actual expected)))
))

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(ns dengine.utils-test
(:require [clojure.test :refer [deftest is testing]]
[arboretum.dengine.utils :refer [string->keyword]]))
(deftest string-to-keyword-test
(testing "string->keyword"
(let [s "Entitled to Widow's Benefit"
expected :entitled-to-widows-benefit
actual (string->keyword s)]
(is (= actual expected)))
(let [s "Entitled to Widow's Benefit"
expected :entitled-to-widows-benefit
actual (string->keyword s)]
(is (= actual expected)))
))