fractran

2022-03-18 11:43:02 +05:30 · 2022-03-18 11:43:02 +05:30 · c3a73e60bb
parent 00ef532602
commit c3a73e60bb
1 changed files with 35 additions and 0 deletions
--- a/fractran.bqn
+++ b/fractran.bqn
@ -0,0 +1,35 @@
+# Fractran interpreter
+
+# Helpers
+_while_ ← {𝔽⍟𝔾∘𝔽_𝕣_𝔾∘𝔽⍟𝔾𝕩}
+ToInt ← 10⊸×⊸+˜´·⌽-⟜'0'
+ToFrac ← {
+  i ← ⊑/'/'=𝕩
+  ToInt¨i(↑⋈1⊸+⊸↓)𝕩
+}
+Split ← ((¬-˜⊢×·+`»⊸>)∘≠⊔⊢)
+
+Fractran ← {
+  𝕊 n‿num‿den:
+  ind ← ⊑/0=den|num×n
+  ⟨(n×ind⊑num)÷ind⊑den ⋄ num ⋄ den⟩
+}
+
+RunFractran ← {
+  steps 𝕊 inp‿prg:
+  num‿den ← <˘⍉>ToFrac¨' 'Split prg
+  step ← 1
+  list ← ⟨inp⟩
+  {
+    step +↩ 1
+    out ← Fractran 𝕩
+    list ∾↩ ⊑out
+    out
+  } _while_ {𝕊 n‿num‿den: (step<steps)∧ ∨´0=den|num} inp‿num‿den
+  list
+}
+
+seq ← 200 RunFractran 2‿"17/91 78/85 19/51 23/38 29/33 77/29 95/23 77/19 1/17 11/13 13/11 15/14 15/2 55/1"
+•Out "Generated numbers: "∾•Repr seq
+•Out "Primes: "∾•Repr (⌈=⌊)∘(2⊸(⋆⁼))⊸/ seq
+