Update vendor (#1560)

vendor/github.com/d5/tengo/v2/eval.go

@@ -0,0 +1,35 @@
+package tengo
+
+import (
+	"context"
+	"fmt"
+	"strings"
+)
+
+// Eval compiles and executes given expr with params, and returns an
+// evaluated value. expr must be an expression. Otherwise it will fail to
+// compile. Expression must not use or define variable "__res__" as it's
+// reserved for the internal usage.
+func Eval(
+	ctx context.Context,
+	expr string,
+	params map[string]interface{},
+) (interface{}, error) {
+	expr = strings.TrimSpace(expr)
+	if expr == "" {
+		return nil, fmt.Errorf("empty expression")
+	}
+
+	script := NewScript([]byte(fmt.Sprintf("__res__ := (%s)", expr)))
+	for pk, pv := range params {
+		err := script.Add(pk, pv)
+		if err != nil {
+			return nil, fmt.Errorf("script add: %w", err)
+		}
+	}
+	compiled, err := script.RunContext(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("script run: %w", err)
+	}
+	return compiled.Get("__res__").Value(), nil
+}