Expr's functions now support parameters with default value

function.go

@@ -59,12 +59,16 @@ func (functor *golangFunctor) Invoke(ctx ExprContext, name string, args []any) (
 // ---- Linking with Expr functions
 type exprFunctor struct {
 	baseFunctor
-	params []string
+	params []ExprFuncParam
 	expr   Expr
 	defCtx ExprContext
 }
 
-func newExprFunctor(e Expr, params []string, ctx ExprContext) *exprFunctor {
+// func newExprFunctor(e Expr, params []string, ctx ExprContext) *exprFunctor {
+// 	return &exprFunctor{expr: e, params: params, defCtx: ctx}
+// }
+
+func newExprFunctor(e Expr, params []ExprFuncParam, ctx ExprContext) *exprFunctor {
 	return &exprFunctor{expr: e, params: params, defCtx: ctx}
 }
 
@@ -79,12 +83,12 @@ func (functor *exprFunctor) Invoke(ctx ExprContext, name string, args []any) (re
 			if funcArg, ok := arg.(Functor); ok {
 				// ctx.RegisterFunc(p, functor, 0, -1)
 				paramSpecs := funcArg.GetParams()
-				ctx.RegisterFunc(p, funcArg, typeAny, paramSpecs)
+				ctx.RegisterFunc(p.Name(), funcArg, typeAny, paramSpecs)
 			} else {
-				ctx.UnsafeSetVar(p, arg)
+				ctx.UnsafeSetVar(p.Name(), arg)
 			}
 		} else {
-			ctx.UnsafeSetVar(p, nil)
+			ctx.UnsafeSetVar(p.Name(), nil)
 		}
 	}
 	result, err = functor.expr.eval(ctx, false)