smartcontract: process slices via reflection in NewParameterFromValue

Pros:
 * less code
 * handles more types
Cons:
 * slow

This code is not likely to be on the hot path and it is exactly the one used
by actors for making calls of various kinds. Supporting more types is more
important here than raw speed.

Signed-off-by: Roman Khimov <roman@nspcc.ru>

pkg/smartcontract/parameter.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"math/big"
 	"os"
+	"reflect"
 	"slices"
 	"strings"
 	"unicode/utf8"
@@ -265,7 +266,7 @@ func NewParameterFromString(in string) (*Parameter, error) {
 // NewParameterFromValue infers Parameter type from the value given and adjusts
 // the value if needed. It does not copy the value if it can avoid doing so. All
 // regular integers, util.*, keys.PublicKey*, string and bool types are supported,
-// slice of byte slices is accepted and converted as well. [errors.ErrUnsupported]
+// slices of various kinds are converted as well. [errors.ErrUnsupported]
 // will be returned for types that can't be used now.
 func NewParameterFromValue(value any) (Parameter, error) {
 	var result = Parameter{
@@ -345,69 +346,30 @@ func NewParameterFromValue(value any) (Parameter, error) {
 	case []Parameter:
 		result.Type = ArrayType
 		result.Value = slices.Clone(v)
-	case [][]byte:
-		return newArrayParameter(v)
-	case []string:
-		return newArrayParameter(v)
-	case []bool:
-		return newArrayParameter(v)
-	case []*big.Int:
-		return newArrayParameter(v)
-	case []int8:
-		return newArrayParameter(v)
-	case []int16:
-		return newArrayParameter(v)
-	case []uint16:
-		return newArrayParameter(v)
-	case []int32:
-		return newArrayParameter(v)
-	case []uint32:
-		return newArrayParameter(v)
-	case []int:
-		return newArrayParameter(v)
-	case []uint:
-		return newArrayParameter(v)
-	case []int64:
-		return newArrayParameter(v)
-	case []uint64:
-		return newArrayParameter(v)
-	case []*Parameter:
-		return newArrayParameter(v)
-	case []Convertible:
-		return newArrayParameter(v)
-	case []util.Uint160:
-		return newArrayParameter(v)
-	case []util.Uint256:
-		return newArrayParameter(v)
-	case []*util.Uint160:
-		return newArrayParameter(v)
-	case []*util.Uint256:
-		return newArrayParameter(v)
-	case []keys.PublicKey:
-		return newArrayParameter(v)
-	case []*keys.PublicKey:
-		return newArrayParameter(v)
-	case keys.PublicKeys:
-		return newArrayParameter(v)
-	case []any:
-		return newArrayParameter(v)
 	case nil:
 		result.Type = AnyType
+	default:
+		rv := reflect.ValueOf(value)
+		switch rv.Kind() {
+		case reflect.Slice, reflect.Array:
+			res := make([]Parameter, 0, rv.Len())
+			for i := range rv.Len() {
+				elem, err := NewParameterFromValue(rv.Index(i).Interface())
+				if err != nil {
+					return result, fmt.Errorf("array index %d: %w", i, err)
+				}
+				res = append(res, elem)
+			}
+			result.Type = ArrayType
+			result.Value = res
 		default:
 			return result, fmt.Errorf("%w: %T type", errors.ErrUnsupported, value)
 		}
+	}
 
 	return result, nil
 }
 
-func newArrayParameter[E any, S ~[]E](values S) (Parameter, error) {
-	arr, err := newArrayOfParameters(values)
-	if err != nil {
-		return Parameter{}, err
-	}
-	return Parameter{Type: ArrayType, Value: arr}, nil
-}
-
 func newArrayOfParameters[E any, S ~[]E](values S) ([]Parameter, error) {
 	res := make([]Parameter, 0, len(values))
 	for i := range values {