kmath-ast-kotlingrad/src/main/kotlin/kscience/kmath/ast/kotlingrad/ScalarsAdapters.kt

@@ -8,8 +8,8 @@ import kscience.kmath.operations.*
 /**
  * Maps [SFun] objects to [MST]. Some unsupported operations like [Derivative] are bound and converted then.
  *
- * @receiver a scalar function.
+ * @receiver the scalar function.
- * @return the [MST].
+ * @return a node.
  */
 public fun <X : SFun<X>> SFun<X>.mst(): MST = MstExtendedField {
     when (this@mst) {
@@ -30,16 +30,33 @@ public fun <X : SFun<X>> SFun<X>.mst(): MST = MstExtendedField {
     }
 }
 
+/**
+ * Maps [MST.Numeric] to [SConst] directly.
+ *
+ * @receiver the node.
+ * @return a new constant.
+ */
+public fun <X : SFun<X>> MST.Numeric.sconst(): SConst<X> = SConst(value)
+
+/**
+ * Maps [MST.Symbolic] to [SVar] directly.
+ *
+ * @receiver the node.
+ * @param proto the prototype instance.
+ * @return a new variable.
+ */
+public fun <X : SFun<X>> MST.Symbolic.svar(proto: X): SVar<X> = SVar(proto, value)
+
 /**
  * Maps [MST] objects to [SFun]. Unsupported operations throw [IllegalStateException].
  *
- * @receiver an [MST].
+ * @receiver the node.
- * @return the scalar function.
+ * @param proto the prototype instance.
+ * @return a scalar function.
  */
-public fun <X : SFun<X>> MST.sfun(proto: X): SFun<X> {
+public fun <X : SFun<X>> MST.sfun(proto: X): SFun<X> = when (this) {
-    return when (this) {
+    is MST.Numeric -> sconst()
-        is MST.Numeric -> SConst(value)
+    is MST.Symbolic -> svar(proto)
-        is MST.Symbolic -> SVar(proto, value)
 
     is MST.Unary -> when (operation) {
         SpaceOperations.PLUS_OPERATION -> value.sfun(proto)
@@ -62,4 +79,3 @@ public fun <X : SFun<X>> MST.sfun(proto: X): SFun<X> {
         else -> error("Binary operation $operation not defined in $this")
     }
 }
-}