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(defn comp
  "Takes a set of functions and returns a fn that is the composition
  of those fns.  The returned fn takes a variable number of args,
  applies the rightmost of fns to the args, the next
  fn (right-to-left) to the result, etc."
  ([] identity) 
  ([fun] fun)
  ([& fs]
    (let [fs (reverse fs)]
      (fn [& args]

robertpfeiffer

;Grammatik in CNF als Clojure-S-Expression
;nur die Produktionen, S ist immer Startsymbol
;Vektor von Produktionen der Form [Nichtterminalsymbol Ableitung]
;Ableitungen sind * einzelne Zeichen (terminalsymbol)
;                 * Vektoren mit 2 Symbolen (nichtterminale)
[[S [A A]]
 [S [A C]]
 [A  \a]
 [B  \b]
 [C [B S]]

robertpfeiffer

;utilities
(defn rec-replace [test fun struct]
  (let [struct (if (test struct) (fun struct) struct)]
    (if (seq? struct) (map (partial rec-replace test fun) struct) struct)))

(defn value [name map]
  (let [in-map (map name)] (if in-map (recur in-map map) name)))

(def *special-rules* {:number (fn [[num] map] 
				  (when (number? (value num map)) [map]))})

robertpfeiffer

(defn circulate [dir coll]
 (let [[a b] (split-at (or ({:left 1} dir) (dec (count coll))) coll)]
  (concat b a)))

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(def *rels* 
   '{same [((X X))]
     dings [(([:bla :bla]))]
     append [( ([] X X) ) ( ([:cons X Y] Z [:cons X A]) (append Y Z A))]
     mann [((:klaus)) ((:karl)) ((X) (vater X Y))]
     vater[((:hans :karl))]
     number[((:null)) (([:succ N]) (anumber N))]
     anumber[((N) (number N))]
     weg [((:wildeck :eisenach))  ((:eisenach :leipzig)) ((:eisenach :erfurt))
	  ((:erfurt :nordhausen)) ((:halle :leipzig))    ((:leipzig :berlin))]

robertpfeiffer

(defmatch s
 ([[+ M N]] ((:number M) (:number N)) {m 'M n 'N} (+ m n))
 ([[+ 0 N]] () {n 'N} n)
 ([[+ N 0]] () {n 'N} n)
 ([[+ A [+ B C]]] () {a'A,b'B,c'C} ['+ ['+ a b] c])
 ([[* M N]] ((:number M) (:number N)) {m 'M n 'N} (* m n))
 ([[* 0 N]] () {n 'N} 0)
 ([[* N 0]] () {n 'N} 0)
 ([[* A [* B C]]] () {a'A,b'B,c'C} ['* ['* a b] c])
 ([A] () {a 'A} a))

robertpfeiffer

(ns de.uni-potsdam.hpi.pentago)

(def empty-board
     [[:_____ :_____ :_____ :_____ :_____ :_____]
      [:_____ :_____ :_____ :_____ :_____ :_____]
      [:_____ :_____ :_____ :_____ :_____ :_____]
      [:_____ :_____ :_____ :_____ :_____ :_____]
      [:_____ :_____ :_____ :_____ :_____ :_____]
      [:_____ :_____ :_____ :_____ :_____ :_____]])

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(define *gl* (gl:make-opengl))
(gl:open-opengl *gl* '(600 600 640 480))


(define init
   (lambda ()
      (gl:clear-color *gl* 0.0 0.0 0.0 0.0)
      (gl:enable *gl* *gl:depth-test*)))

robertpfeiffer

http://yuml.me/diagram/class/[Questionnaire||asEval;asAnswer;asEditor;canEval: aUser;canAnswer:aUser;canSubmit:aUser;canEdit:aUser], [Test|deadline|canAnswer:aUser], [Poll||canEval: aUser;asEval], [Exam|answertime|canSubmit:aUser], [Questionnaire]1->n[Question||statistics: aQuestionnaire], [Questionnaire]^[Test], [Test]^[Exam], [Questionnaire]^[Poll].

robertpfeiffer

CREATE VIEW actormw AS SELECT DISTINCT * FROM ((SELECT NAME, ‚w’ AS SEX, MOVIE_ID, ROLE FROM „actress“) UNION ALL (SELECT NAME, ‚m’ AS SEX, MOVIE_ID, ROLE FROM actor));