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(ns clojush.translate
(:use [clojush util]
(defn delete-prev-paren-pair
"Deletes the last closed paren pair from prog, which may be a partial program."
(loop [reversed-prog (reverse prog)
new-prog []
number-close-parens 0
found-first-close false]
; Check if reversed-prog is empty, in which case we are done
(empty? reversed-prog) (vec (reverse new-prog))
; Check if done, which is if we've found the first :close, the paren-stack is empty, and
; the first item in reversed-prog is :open
(and found-first-close
(zero? number-close-parens)
(= :open (first reversed-prog))) (vec (reverse (concat new-prog (rest reversed-prog))))
; Check if looking for the correct :open but found an :open for a different paren
(and found-first-close
(< 0 number-close-parens)
(= :open (first reversed-prog))) (recur (rest reversed-prog)
(conj new-prog (first reversed-prog))
(dec number-close-parens)
; Check if looking for correct :open but found another :close
(and found-first-close
(= :close (first reversed-prog))) (recur (rest reversed-prog)
(conj new-prog (first reversed-prog))
(inc number-close-parens)
; Check if just found first :close. In which case skip it and set the found-first-close flag
(and (not found-first-close)
(= :close (first reversed-prog))) (recur (rest reversed-prog)
; Otherwise, just put the item onto new-prog and keep looking with same other variables
:else (recur (rest reversed-prog)
(conj new-prog (first reversed-prog))
(defn translate-plush-genome-to-push-program
"Takes as input an individual (or map) containing a Plush genome (:genome)
and translates it to the correct Push program with
balanced parens. The linear Plush genome is made up of a list of instruction
maps, each including an :instruction key as well as other epigenetic marker
keys. As the linear Plush genome is traversed, each instruction that requires
parens will push :close and/or :close-open onto the paren-stack, and will
also put an open paren after it in the program. For example, an instruction
that requires 3 paren groupings will push :close, then :close-open, then :close-open.
When a positive number is encountered in the :close key of the
instruction map, it is set to num-parens-here during the next recur. This
indicates the number of parens to put here, if need is indicated on the
paren-stack. If the top item of the paren-stack is :close, a close paren
will be inserted. If the top item is :close-open, a close paren followed by
an open paren will be inserted.
If the end of the program is reached but parens are still needed (as indicated by
the paren-stack), parens are added until the paren-stack is empty.
Instruction maps that have :silence set to true will be ignored entirely."
[{:keys [genome program]}
{:keys [max-points] :as argmap}]
(if program
(let [translated-program
(loop [prog []
; The Push program incrementally being built
gn genome
; The linear Plush genome, where items will be popped off the
; front. Each item is a map containing at least the key
; :instruction, and unless the program is flat, also :close
num-parens-here 0
; The number of parens that still need to be added at this
; location.
paren-stack '()
; Whenever an instruction requires parens grouping, it will
; push either :close or :close-open on this stack. This will
; indicate what to insert in the program the next time a paren
; is indicated by the :close key in the instruction map.
; Check if need to add close parens here
(< 0 num-parens-here)
(recur (cond
(= (first paren-stack) :close)
(conj prog :close)
(= (first paren-stack) :close-open)
(conj (conj prog :close) :open)
; If paren-stack is empty, we won't put any parens in
; even though the :close epigenetic marker indicated to
; do so
:else prog
(dec num-parens-here)
(rest paren-stack))
; Check if at end of program but still need to add parens
(and (empty? gn)
(not (empty? paren-stack)))
(recur prog
(count paren-stack)
; Check if done
(empty? gn)
(open-close-sequence-to-list (apply list prog))
; Check for no-oped instruction. This instruction will be replaced
; by exec_noop, but will still have effects like :close count
(= (:silent (first gn)) :no-op)
(recur (conj prog 'exec_noop)
(rest gn)
(get (first gn) :close 0)
; Check for silenced instruction
(get (first gn) :silent false)
(recur prog
(rest gn)
; If here, ready for next instruction
:else (let [number-paren-groups (lookup-instruction-paren-groups
(:instruction (first gn)))
new-paren-stack (if (>= 0 number-paren-groups)
(list-concat (repeat (dec number-paren-groups)
(if (= 'noop_delete_prev_paren_pair (:instruction (first gn)))
(recur (delete-prev-paren-pair prog)
(rest gn)
(get (first gn) :close 0)
(recur (if (= 'noop_open_paren (:instruction (first gn)))
(conj prog :open)
(if (>= 0 number-paren-groups)
(conj prog (:instruction (first gn)))
(conj (conj prog (:instruction (first gn))) :open)))
(rest gn)
(get (first gn) :close 0)
; ^ The number of close parens to put after this instruction;
; if :close isn't in instruction map, default to zero
(if (> (count-points translated-program) max-points)
'() ; Translates to an empty program if program exceeds max-points
(defn population-translate-plush-to-push
"Converts the population of Plush genomes into Push programs."
[pop-agents {:keys [use-single-thread] :as argmap}]
(dorun (map #((if use-single-thread swap! send)
(fn [i] (assoc i :program (translate-plush-genome-to-push-program i argmap))))
(when-not use-single-thread (apply await pop-agents))) ;; SYNCHRONIZE
;; Plushy translation
(defn translate-plushy-to-plush
"Translates Plushy genome into a Plush genome."
[{:keys [genome]}]
(loop [genome genome
plush []]
(empty? genome) (apply list plush)
;; :skip ignores the next gene
(= (first genome) :skip) (recur (drop 2 genome)
;; if plush is empty, can't increment :close marker, so skip
(and (empty? plush)
(= (first genome) :close)) (recur (rest genome)
;; :close adds to the close count of the previous gene
(= (first genome) :close) (recur (rest genome)
(update-in plush [(dec (count plush)) :close] inc))
;; otherwise, just make a new instruction
:else (recur (rest genome)
(conj plush {:instruction (first genome) :close 0})))))
(defn population-translate-plushy-to-push
"Converts the population of Plushy genomes into Push programs."
[pop-agents {:keys [use-single-thread] :as argmap}]
(dorun (map #((if use-single-thread swap! send)
(fn [i] (assoc i
{:genome (translate-plushy-to-plush i)}
(when-not use-single-thread (apply await pop-agents))) ;; SYNCHRONIZE
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