add buildin function add/minus/times/divide for package gview

errors/gcode/gcode_local.go

@@ -0,0 +1,43 @@
+// Copyright GoFrame gf Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package gcode
+
+import "fmt"
+
+// localCode is an implementer for interface Code for internal usage only.
+type localCode struct {
+	code    int         // Error code, usually an integer.
+	message string      // Brief message for this error code.
+	detail  interface{} // As type of interface, it is mainly designed as an extension field for error code.
+}
+
+// Code returns the integer number of current error code.
+func (c localCode) Code() int {
+	return c.code
+}
+
+// Message returns the brief message for current error code.
+func (c localCode) Message() string {
+	return c.message
+}
+
+// Detail returns the detailed information of current error code,
+// which is mainly designed as an extension field for error code.
+func (c localCode) Detail() interface{} {
+	return c.detail
+}
+
+// String returns current error code as a string.
+func (c localCode) String() string {
+	if c.detail != nil {
+		return fmt.Sprintf(`%d:%s %v`, c.code, c.message, c.detail)
+	}
+	if c.message != "" {
+		return fmt.Sprintf(`%d:%s`, c.code, c.message)
+	}
+	return fmt.Sprintf(`%d`, c.code)
+}