close task 7501

demo/test.yaml

@@ -5,7 +5,7 @@ version: 1.0
 
 fields:
   - field: test
-    range: 9-1:2{2}
+    range: 9-1:-2{2}
 
   - field: field_use_instance   # 引用default.xml里的嵌套字段
     prefix: "["                 # 复写前缀

src/gen/list.go

@@ -85,7 +85,7 @@ func CheckRangeType(startStr string, endStr string, stepStr string) (string, int
 			rand = true
 		}
 
-		if int1 > int2 && step.(int) > 0 {
+		if (int1 > int2 && step.(int) > 0) || (int1 < int2 && step.(int) < 0) {
 			step = -1 * step.(int)
 		}
 		return "int", step, 0, rand
@@ -110,7 +110,7 @@ func CheckRangeType(startStr string, endStr string, stepStr string) (string, int
 
 			precision := getPrecision(float1, step)
 
-			if float1 > float2 && step.(int) > 0 {
+			if (float1 > float2 && step.(int) > 0) || (float1 < float2 && step.(int) < 0) {
 				step = -1 * step.(int)
 			}
 			return "float", step, precision, rand
@@ -126,7 +126,8 @@ func CheckRangeType(startStr string, endStr string, stepStr string) (string, int
 				rand = true
 			}
 
-			if strings.Compare(startStr,endStr) > 0 && step.(int) > 0 {
+			if (strings.Compare(startStr,endStr) > 0 && step.(int) > 0) ||
+					(strings.Compare(startStr,endStr) < 0 && step.(int) < 0) {
 				step = -1 * step.(int)
 			}
 			return "char", step, 0, rand