(refs #7489) Added replicate function to Prelude

[simantics/platform.git] / bundles / org.simantics.scl.runtime / scl / Prelude.scl

diff --git a/bundles/org.simantics.scl.runtime/scl/Prelude.scl b/bundles/org.simantics.scl.runtime/scl/Prelude.scl
index eb1e8cd6ff35bed0186d22d68e7b115626246d04..83d84ccf2da505c6590b404c23c93a484fb98ad2 100644 (file)
--- a/bundles/org.simantics.scl.runtime/scl/Prelude.scl
+++ b/bundles/org.simantics.scl.runtime/scl/Prelude.scl
@@ -1065,6 +1065,15 @@ mapEither f list = runProc do
         Right v -> addArrayList r v)
     (Java.unsafeCoerce l, Java.unsafeCoerce r)
 
+"`replicate n v` returns a list of length `n` such that each element is a copy of `v`."
+@inline
+replicate :: Integer -> a -> [a]
+replicate n v = build (\empty cons ->
+    let aux 0 l = l
+        aux i l = aux (i-1) (cons l v)
+    in aux n empty 
+    )
+
 /// FunctorM ///
 
 class (Functor f) => FunctorM f where
@@ -1273,7 +1282,14 @@ The Either type represents values with two possibilities: a value of type `Eithe
 The `Either` type is sometimes used to represent a value which is either correct or an error; by convention, the `Left` constructor
 is used to hold an error value and the `Right` constructor is used to hold a correct value (mnemonic: "right" also means "correct").
 """
-data Either a b = Left a | Right b
+@JavaType "org.simantics.scl.runtime.either.Either"
+data Either a b =
+    @JavaType "org.simantics.scl.runtime.either.Left"
+    @FieldNames [value]
+    Left a
+  | @JavaType "org.simantics.scl.runtime.either.Right"
+    @FieldNames [value]
+    Right b
 
 deriving instance (Ord a, Ord b) => Ord (Either a b)
 deriving instance (Show a, Show b) => Show (Either a b)
@@ -2116,7 +2132,7 @@ importJava "org.simantics.scl.runtime.procedure.Procedures" where
     
     "Executes the given expression and catches certain class of exceptions (specified by the catch handler that is given as a second parameter.)"
     @JavaName catch_
-    catch :: VecComp ex => (<e> a) -> (ex -> <e> a) -> <e> a
+    catch :: VecComp ex => (<e,Exception> a) -> (ex -> <e> a) -> <e> a
 
 importJava "java.lang.Throwable" where
     data Throwable