refactored data-types to reduce plugin sizes

types/str/string.go

@@ -0,0 +1,25 @@
+// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
+// All rights reserved.
+
+// string.go
+package str
+
+import (
+	"fmt"
+
+	"git.portale-stac.it/go-pkg/expr/kern"
+)
+
+func IsString(v any) (ok bool) {
+	_, ok = v.(string)
+	return ok
+}
+
+func ToGoString(value any, description string) (s string, err error) {
+	if s, ok := value.(string); ok {
+		return s, nil
+	} else {
+		err = fmt.Errorf("%s expected string, got %s (%v)", description, kern.TypeName(value), value)
+	}
+	return
+}