Fix range implementation

purescm · Oct 27, 2023 · 16055f2 · 16055f2
1 parent 9610b4c
commit 16055f2
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Showing 3 changed files with 16 additions and 8 deletions.
diff --git a/src/Data/Array.ss b/src/Data/Array.ss
@@ -24,7 +24,7 @@
           allImpl
           unsafeIndexImpl
           )
-  (import (only (rnrs base) define lambda let error + -)
+  (import (only (rnrs base) define lambda begin let let* cond if not * + - = > error)
           (prefix (purs runtime lib) rt:)
           (prefix (purs runtime srfi :214) srfi:214:))
 
@@ -34,9 +34,17 @@
 
   (define rangeImpl
     (lambda (start end)
-      (let ([res (srfi:214:make-flexvector (+ (- end start) 1))])
-        (srfi:214:flexvector-map/index! (lambda (i x) (+ i start)) res)
-        res)))
+      (let* ([step (if (> start end) -1 1)]
+            [result (srfi:214:make-flexvector (+ (* step (- end start)) 1))])
+        (let recur ([i start]
+                    [n 0])
+          (if (not (= i end))
+            (begin
+              (srfi:214:flexvector-set! result n i)
+              (recur (+ i step) (+ n 1)))
+            (begin
+              (srfi:214:flexvector-set! result n i)
+              result))))))
 
   (define replicateImpl
     (lambda (count value)

diff --git a/test/Test/Data/Array.purs b/test/Test/Data/Array.purs
@@ -16,7 +16,7 @@ import Effect (Effect)
 import Effect.Console (log)
 import Partial.Unsafe (unsafePartial)
 import Test.Assert (assert)
-import Test.Data.UndefinedOr (defined, undefined)
+-- import Test.Data.UndefinedOr (defined, undefined)
 
 testArray :: Effect Unit
 testArray = do
@@ -297,7 +297,7 @@ testArray = do
 
   log "sort should reorder a list into ascending order based on the result of compare"
   assert $ A.sort [1, 3, 2, 5, 6, 4] == [1, 2, 3, 4, 5, 6]
-  assert $ A.sort [defined 1, undefined, defined 2] == [undefined, defined 1, defined 2]
+  -- assert $ A.sort [defined 1, undefined, defined 2] == [undefined, defined 1, defined 2]
 
   log "sortBy should reorder a list into ascending order based on the result of a comparison function"
   assert $ A.sortBy (flip compare) [1, 3, 2, 5, 6, 4] == [6, 5, 4, 3, 2, 1]

diff --git a/test/Test/Main.purs b/test/Test/Main.purs
@@ -3,15 +3,15 @@ module Test.Main where
 import Prelude
 
 import Effect (Effect)
--- import Test.Data.Array (testArray)
+import Test.Data.Array (testArray)
 import Test.Data.Array.Partial (testArrayPartial)
 import Test.Data.Array.ST (testArrayST)
 import Test.Data.Array.ST.Partial (testArraySTPartial)
 -- import Test.Data.Array.NonEmpty (testNonEmptyArray)
 
 main :: Effect Unit
 main = do
-  -- testArray
+  testArray
   testArrayST
   testArrayPartial
   testArraySTPartial