From f6ae0cef47502a24b9d354b9b76903e5f6fd9541 Mon Sep 17 00:00:00 2001
From: Max <shadow.iqka@qq.com>
Date: Wed, 7 Aug 2024 11:08:25 +0800
Subject: [PATCH] [add] Empty expression helper

---
 sui/core/data.go | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/sui/core/data.go b/sui/core/data.go
index 8a761d26..f06c5b23 100644
--- a/sui/core/data.go
+++ b/sui/core/data.go
@@ -49,6 +49,7 @@ var options = []expr.Option{
 	expr.Function("P_", _process),
 	expr.Function("True", _true),
 	expr.Function("False", _false),
+	expr.Function("Empty", _empty),
 	expr.AllowUndefinedVariables(),
 }
 
@@ -273,6 +274,31 @@ func _true(args ...any) (interface{}, error) {
 	return false, nil
 }
 
+func _empty(args ...any) (interface{}, error) {
+
+	if len(args) < 1 {
+		return true, nil
+	}
+
+	if args[0] == nil {
+		return true, nil
+	}
+
+	if v, ok := args[0].(string); ok {
+		return v == "", nil
+	}
+
+	if v, ok := args[0].(int); ok {
+		return v == 0, nil
+	}
+
+	if v, ok := args[0].(bool); ok {
+		return !v, nil
+	}
+
+	return true, nil
+}
+
 func _process(args ...any) (interface{}, error) {
 
 	if len(args) < 1 {