From 4cd4559784908df3205bd60515ffd4faeaff8551 Mon Sep 17 00:00:00 2001
From: Anson <77931774@qq.com>
Date: Thu, 12 Aug 2021 00:21:36 +0800
Subject: [PATCH 1/8] fix tcp demo error content-length

---
 .example/net/gtcp/gtcp_conn.go | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/.example/net/gtcp/gtcp_conn.go b/.example/net/gtcp/gtcp_conn.go
index a312c4ead..4008053ef 100644
--- a/.example/net/gtcp/gtcp_conn.go
+++ b/.example/net/gtcp/gtcp_conn.go
@@ -6,7 +6,7 @@ import (
 	"os"
 
 	"github.com/gogf/gf/net/gtcp"
-	"github.com/gogf/gf/util/gconv"
+	"strconv"
 )
 
 func main() {
@@ -16,7 +16,7 @@ func main() {
 	}
 	defer conn.Close()
 
-	if err := conn.Send([]byte("GET / HTTP/1.1\n\n")); err != nil {
+	if err := conn.Send([]byte("GET / HTTP/1.1\r\n\r\n")); err != nil {
 		panic(err)
 	}
 
@@ -30,13 +30,17 @@ func main() {
 			array := bytes.Split(data, []byte(": "))
 			// 获得页面内容长度
 			if contentLength == 0 && len(array) == 2 && bytes.EqualFold([]byte("Content-Length"), array[0]) {
-				contentLength = gconv.Int(array[1])
+				// http 以\r\n换行，需要把\r也去掉
+				contentLength, err = strconv.Atoi(string(array[1][:len(array[1])-1]))
+                		if err != nil {
+                    			fmt.Println(err)
+                		}
 			}
 			header = append(header, data...)
 			header = append(header, '\n')
 		}
-		// header读取完毕，读取文本内容
-		if contentLength > 0 && len(data) == 0 {
+		// header读取完毕，读取文本内容, 1为\r
+		if contentLength > 0 && len(data) == 1 {
 			content, _ = conn.Recv(contentLength)
 			break
 		}

From 2bd76dfdded37c0c9da71c20211d17503327099c Mon Sep 17 00:00:00 2001
From: ansionfor <77931774@qq.com>
Date: Thu, 12 Aug 2021 09:35:57 +0800
Subject: [PATCH 2/8] go fmt code

---
 .example/net/gtcp/gtcp_conn.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/.example/net/gtcp/gtcp_conn.go b/.example/net/gtcp/gtcp_conn.go
index 4008053ef..7cd01001e 100644
--- a/.example/net/gtcp/gtcp_conn.go
+++ b/.example/net/gtcp/gtcp_conn.go
@@ -32,9 +32,9 @@ func main() {
 			if contentLength == 0 && len(array) == 2 && bytes.EqualFold([]byte("Content-Length"), array[0]) {
 				// http 以\r\n换行，需要把\r也去掉
 				contentLength, err = strconv.Atoi(string(array[1][:len(array[1])-1]))
-                		if err != nil {
-                    			fmt.Println(err)
-                		}
+				if err != nil {
+					fmt.Println(err)
+				}
 			}
 			header = append(header, data...)
 			header = append(header, '\n')

From 91cd4f96f0b9b9ad464b50c2d8de9bdc34b9e07f Mon Sep 17 00:00:00 2001
From: Anson <77931774@qq.com>
Date: Thu, 12 Aug 2021 10:50:46 +0800
Subject: [PATCH 3/8] Update gtcp_conn.go

---
 .example/net/gtcp/gtcp_conn.go | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/.example/net/gtcp/gtcp_conn.go b/.example/net/gtcp/gtcp_conn.go
index 7cd01001e..323595751 100644
--- a/.example/net/gtcp/gtcp_conn.go
+++ b/.example/net/gtcp/gtcp_conn.go
@@ -6,7 +6,7 @@ import (
 	"os"
 
 	"github.com/gogf/gf/net/gtcp"
-	"strconv"
+	"github.com/gogf/gf/util/gconv"
 )
 
 func main() {
@@ -31,10 +31,7 @@ func main() {
 			// 获得页面内容长度
 			if contentLength == 0 && len(array) == 2 && bytes.EqualFold([]byte("Content-Length"), array[0]) {
 				// http 以\r\n换行，需要把\r也去掉
-				contentLength, err = strconv.Atoi(string(array[1][:len(array[1])-1]))
-				if err != nil {
-					fmt.Println(err)
-				}
+				contentLength = gconv.Int(string(array[1][:len(array[1])-1]))
 			}
 			header = append(header, data...)
 			header = append(header, '\n')

From ef36cf84463b831e48005097198fae580169a75d Mon Sep 17 00:00:00 2001
From: John <john@johng.cn>
Date: Fri, 20 Aug 2021 23:15:48 +0800
Subject: [PATCH 4/8] fix issue in example of package gjson

---
 encoding/gjson/gjson_z_example_conversion_test.go | 5 +++--
 go.mod                                            | 7 -------
 net/ghttp/ghttp.go                                | 6 +++---
 3 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/encoding/gjson/gjson_z_example_conversion_test.go b/encoding/gjson/gjson_z_example_conversion_test.go
index c55d9c409..d2f4bdd9f 100644
--- a/encoding/gjson/gjson_z_example_conversion_test.go
+++ b/encoding/gjson/gjson_z_example_conversion_test.go
@@ -19,6 +19,7 @@ func Example_conversionNormalFormats() {
             "array" : ["John", "Ming"]
         }
     }`
+
 	if j, err := gjson.DecodeToJson(data); err != nil {
 		panic(err)
 	} else {
@@ -48,8 +49,8 @@ func Example_conversionNormalFormats() {
 	// YAML:
 	// users:
 	//     array:
-	//       - John
-	//       - Ming
+	//         - John
+	//         - Ming
 	//     count: 1
 	//
 	// ======================
diff --git a/go.mod b/go.mod
index d07ddc00e..19fc61f7f 100644
--- a/go.mod
+++ b/go.mod
@@ -5,24 +5,17 @@ go 1.14
 require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/clbanning/mxj v1.8.5-0.20200714211355-ff02cfb8ea28
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/fatih/color v1.12.0
 	github.com/fsnotify/fsnotify v1.4.9
 	github.com/gogf/mysql v1.6.1-0.20210603073548-16164ae25579
 	github.com/gomodule/redigo v2.0.0+incompatible
 	github.com/gorilla/websocket v1.4.2
 	github.com/grokify/html-strip-tags-go v0.0.0-20190921062105-daaa06bf1aaf
-	github.com/kr/text v0.2.0 // indirect
-	github.com/mattn/go-runewidth v0.0.10 // indirect
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/olekukonko/tablewriter v0.0.5
 	go.opentelemetry.io/otel v1.0.0-RC2
 	go.opentelemetry.io/otel/oteltest v1.0.0-RC2
 	go.opentelemetry.io/otel/trace v1.0.0-RC2
 	golang.org/x/net v0.0.0-20210520170846-37e1c6afe023
-	golang.org/x/sys v0.0.0-20210616094352-59db8d763f22 // indirect
 	golang.org/x/text v0.3.6
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
diff --git a/net/ghttp/ghttp.go b/net/ghttp/ghttp.go
index 3c539cbb5..f4f55c34b 100644
--- a/net/ghttp/ghttp.go
+++ b/net/ghttp/ghttp.go
@@ -23,12 +23,12 @@ type (
 	Server struct {
 		name             string                           // Unique name for instance management.
 		config           ServerConfig                     // Configuration.
-		plugins          []Plugin                         // Plugin array to extends server functionality.
+		plugins          []Plugin                         // Plugin array to extend server functionality.
 		servers          []*gracefulServer                // Underlying http.Server array.
 		serverCount      *gtype.Int                       // Underlying http.Server count.
 		closeChan        chan struct{}                    // Used for underlying server closing event notification.
 		serveTree        map[string]interface{}           // The route map tree.
-		serveCache       *gcache.Cache                    // Server cache for internal usage.
+		serveCache       *gcache.Cache                    // Server caches for internal usage.
 		routesMap        map[string][]registeredRouteItem // Route map mainly for route dumps and repeated route checks.
 		statusHandlerMap map[string][]HandlerFunc         // Custom status handler map.
 		sessionManager   *gsession.Manager                // Session manager.
@@ -142,7 +142,7 @@ var (
 	serverMapping = gmap.NewStrAnyMap(true)
 
 	// serverRunning marks the running server count.
-	// If there no successful server running or all servers shutdown, this value is 0.
+	// If there is no successful server running or all servers' shutdown, this value is 0.
 	serverRunning = gtype.NewInt()
 
 	// wsUpGrader is the default up-grader configuration for websocket.

From 6be582355c682c087211697fe9990f856cfbfa38 Mon Sep 17 00:00:00 2001
From: John Guo <john@johng.cn>
Date: Wed, 25 Aug 2021 10:58:29 +0800
Subject: [PATCH 5/8] improve DB.Close for package gdb

---
 database/gdb/gdb_core.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/database/gdb/gdb_core.go b/database/gdb/gdb_core.go
index 5a63e285c..7b76f5dca 100644
--- a/database/gdb/gdb_core.go
+++ b/database/gdb/gdb_core.go
@@ -111,6 +111,7 @@ func (c *Core) Close(ctx context.Context) (err error) {
 				if err != nil {
 					return
 				}
+				delete(m, k)
 			}
 		}
 	})

From 59397fd8a5c1e6b810c79bd61c6bff2171e4365c Mon Sep 17 00:00:00 2001
From: John Guo <john@johng.cn>
Date: Wed, 25 Aug 2021 20:00:53 +0800
Subject: [PATCH 6/8] add buildin function add/minus/times/divide for package
 gview

---
 errors/gcode/gcode.go             | 38 +------------------------
 errors/gcode/gcode_local.go       | 43 ++++++++++++++++++++++++++++
 errors/gcode/gcode_test.go        | 23 +++++++++++++++
 os/gview/gview.go                 |  6 +++-
 os/gview/gview_buildin.go         | 47 ++++++++++++++++++++++++++++++-
 os/gview/gview_config.go          |  8 +++---
 os/gview/gview_instance.go        |  2 +-
 os/gview/gview_parse.go           | 24 ++++++++--------
 os/gview/gview_unit_basic_test.go | 37 ++++++++++++++++++++++++
 9 files changed, 172 insertions(+), 56 deletions(-)
 create mode 100644 errors/gcode/gcode_local.go
 create mode 100644 errors/gcode/gcode_test.go

diff --git a/errors/gcode/gcode.go b/errors/gcode/gcode.go
index 6248ed0c7..8665b8a27 100644
--- a/errors/gcode/gcode.go
+++ b/errors/gcode/gcode.go
@@ -7,8 +7,6 @@
 // Package gcode provides universal error code definition and common error codes implements.
 package gcode
 
-import "fmt"
-
 // Code is universal error code interface definition.
 type Code interface {
 	// Code returns the integer number of current error code.
@@ -22,13 +20,6 @@ type Code interface {
 	Detail() interface{}
 }
 
-// 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.
-}
-
 // ================================================================================================================
 // Common error code definition.
 // There are reserved internal error code by framework: code < 1000.
@@ -52,7 +43,7 @@ var (
 	CodeSecurityReason           = localCode{62, "Security Reason", nil}             // Security Reason.
 	CodeServerBusy               = localCode{63, "Server Is Busy", nil}              // Server is busy, please try again later.
 	CodeUnknown                  = localCode{64, "Unknown Error", nil}               // Unknown error.
-	CodeResourceNotExist         = localCode{65, "Resource Not Exist", nil}          // Resource does not exist.
+	CodeNotFound                 = localCode{65, "Not Found", nil}                   // Resource does not exist.
 	CodeInvalidRequest           = localCode{66, "Invalid Request", nil}             // Invalid request.
 	CodeBusinessValidationFailed = localCode{300, "Business Validation Failed", nil} // Business validation failed.
 )
@@ -66,30 +57,3 @@ func New(code int, message string, detail interface{}) Code {
 		detail:  detail,
 	}
 }
-
-// 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)
-}
diff --git a/errors/gcode/gcode_local.go b/errors/gcode/gcode_local.go
new file mode 100644
index 000000000..1ec1d1ea9
--- /dev/null
+++ b/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)
+}
diff --git a/errors/gcode/gcode_test.go b/errors/gcode/gcode_test.go
new file mode 100644
index 000000000..68a4e7da4
--- /dev/null
+++ b/errors/gcode/gcode_test.go
@@ -0,0 +1,23 @@
+// Copyright GoFrame 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_test
+
+import (
+	"github.com/gogf/gf/errors/gcode"
+	"testing"
+
+	"github.com/gogf/gf/test/gtest"
+)
+
+func Test_Nil(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		c := gcode.New(1, "custom error", "detailed description")
+		t.Assert(c.Code(), 1)
+		t.Assert(c.Message(), "custom error")
+		t.Assert(c.Detail(), "detailed description")
+	})
+}
diff --git a/os/gview/gview.go b/os/gview/gview.go
index 1b072f6e3..e6823d072 100644
--- a/os/gview/gview.go
+++ b/os/gview/gview.go
@@ -61,7 +61,7 @@ func ParseContent(ctx context.Context, content string, params ...Params) (string
 }
 
 // New returns a new view object.
-// The parameter <path> specifies the template directory path to load template files.
+// The parameter `path` specifies the template directory path to load template files.
 func New(path ...string) *View {
 	view := &View{
 		paths:        garray.NewStrArray(),
@@ -143,6 +143,10 @@ func New(path ...string) *View {
 		"map":        view.buildInFuncMap,
 		"maps":       view.buildInFuncMaps,
 		"json":       view.buildInFuncJson,
+		"plus":       view.buildInFuncPlus,
+		"minus":      view.buildInFuncMinus,
+		"times":      view.buildInFuncTimes,
+		"divide":     view.buildInFuncDivide,
 	})
 
 	return view
diff --git a/os/gview/gview_buildin.go b/os/gview/gview_buildin.go
index c838750ee..da22f78fa 100644
--- a/os/gview/gview_buildin.go
+++ b/os/gview/gview_buildin.go
@@ -219,8 +219,53 @@ func (view *View) buildInFuncNl2Br(str interface{}) string {
 }
 
 // buildInFuncJson implements build-in template function: json ,
-// which encodes and returns <value> as JSON string.
+// which encodes and returns `value` as JSON string.
 func (view *View) buildInFuncJson(value interface{}) (string, error) {
 	b, err := json.Marshal(value)
 	return gconv.UnsafeBytesToStr(b), err
 }
+
+// buildInFuncPlus implements build-in template function: plus ,
+// which returns the result that pluses all `deltas` to `value`.
+func (view *View) buildInFuncPlus(value interface{}, deltas ...interface{}) string {
+	result := gconv.Float64(value)
+	for _, v := range deltas {
+		result += gconv.Float64(v)
+	}
+	return gconv.String(result)
+}
+
+// buildInFuncMinus implements build-in template function: minus ,
+// which returns the result that subtracts all `deltas` from `value`.
+func (view *View) buildInFuncMinus(value interface{}, deltas ...interface{}) string {
+	result := gconv.Float64(value)
+	for _, v := range deltas {
+		result -= gconv.Float64(v)
+	}
+	return gconv.String(result)
+}
+
+// buildInFuncTimes implements build-in template function: times ,
+// which returns the result that multiplies `value` by all of `values`.
+func (view *View) buildInFuncTimes(value interface{}, values ...interface{}) string {
+	result := gconv.Float64(value)
+	for _, v := range values {
+		result *= gconv.Float64(v)
+	}
+	return gconv.String(result)
+}
+
+// buildInFuncDivide implements build-in template function: divide ,
+// which returns the result that divides `value` by all of `values`.
+func (view *View) buildInFuncDivide(value interface{}, values ...interface{}) string {
+	result := gconv.Float64(value)
+	for _, v := range values {
+		value2Float64 := gconv.Float64(v)
+		if value2Float64 == 0 {
+			// Invalid `value2`.
+			return "0"
+		}
+		result /= value2Float64
+	}
+	return gconv.String(result)
+}
diff --git a/os/gview/gview_config.go b/os/gview/gview_config.go
index 79dd6eced..cc62d1e88 100644
--- a/os/gview/gview_config.go
+++ b/os/gview/gview_config.go
@@ -95,7 +95,7 @@ func (view *View) SetConfigWithMap(m map[string]interface{}) error {
 }
 
 // SetPath sets the template directory path for template file search.
-// The parameter <path> can be absolute or relative path, but absolute path is suggested.
+// The parameter `path` can be absolute or relative path, but absolute path is suggested.
 func (view *View) SetPath(path string) error {
 	var (
 		isDir    = false
@@ -239,9 +239,9 @@ func (view *View) SetAutoEncode(enable bool) {
 	view.config.AutoEncode = enable
 }
 
-// BindFunc registers customized global template function named <name>
-// with given function <function> to current view object.
-// The <name> is the function name which can be called in template content.
+// BindFunc registers customized global template function named `name`
+// with given function `function` to current view object.
+// The `name` is the function name which can be called in template content.
 func (view *View) BindFunc(name string, function interface{}) {
 	view.funcMap[name] = function
 	// Clear global template object cache.
diff --git a/os/gview/gview_instance.go b/os/gview/gview_instance.go
index 7781dcd0c..8845e5d21 100644
--- a/os/gview/gview_instance.go
+++ b/os/gview/gview_instance.go
@@ -19,7 +19,7 @@ var (
 )
 
 // Instance returns an instance of View with default settings.
-// The parameter <name> is the name for the instance.
+// The parameter `name` is the name for the instance.
 func Instance(name ...string) *View {
 	key := DefaultName
 	if len(name) > 0 && name[0] != "" {
diff --git a/os/gview/gview_parse.go b/os/gview/gview_parse.go
index cd50e7a8b..c8a4811ee 100644
--- a/os/gview/gview_parse.go
+++ b/os/gview/gview_parse.go
@@ -53,7 +53,7 @@ var (
 	resourceTryFolders = []string{"template/", "template", "/template", "/template/"}
 )
 
-// Parse parses given template file <file> with given template variables <params>
+// Parse parses given template file `file` with given template variables `params`
 // and returns the parsed template content.
 func (view *View) Parse(ctx context.Context, file string, params ...Params) (result string, err error) {
 	var tpl interface{}
@@ -65,7 +65,7 @@ func (view *View) Parse(ctx context.Context, file string, params ...Params) (res
 			content  string
 			resource *gres.File
 		)
-		// Searching the absolute file path for <file>.
+		// Searching the absolute file path for `file`.
 		path, folder, resource, err = view.searchFile(file)
 		if err != nil {
 			return nil
@@ -100,7 +100,7 @@ func (view *View) Parse(ctx context.Context, file string, params ...Params) (res
 	if item.content == "" {
 		return "", nil
 	}
-	// Get the template object instance for <folder>.
+	// Get the template object instance for `folder`.
 	tpl, err = view.getTemplate(item.path, item.folder, fmt.Sprintf(`*%s`, gfile.Ext(item.path)))
 	if err != nil {
 		return "", err
@@ -120,7 +120,7 @@ func (view *View) Parse(ctx context.Context, file string, params ...Params) (res
 		return "", err
 	}
 	// Note that the template variable assignment cannot change the value
-	// of the existing <params> or view.data because both variables are pointers.
+	// of the existing `params` or view.data because both variables are pointers.
 	// It needs to merge the values of the two maps into a new map.
 	variables := gutil.MapMergeCopy(params...)
 	if len(view.data) > 0 {
@@ -154,7 +154,7 @@ func (view *View) ParseDefault(ctx context.Context, params ...Params) (result st
 	return view.Parse(ctx, view.config.DefaultFile, params...)
 }
 
-// ParseContent parses given template content <content>  with template variables <params>
+// ParseContent parses given template content `content`  with template variables `params`
 // and returns the parsed content in []byte.
 func (view *View) ParseContent(ctx context.Context, content string, params ...Params) (string, error) {
 	// It's not necessary continuing parsing if template content is empty.
@@ -188,7 +188,7 @@ func (view *View) ParseContent(ctx context.Context, content string, params ...Pa
 		return "", err
 	}
 	// Note that the template variable assignment cannot change the value
-	// of the existing <params> or view.data because both variables are pointers.
+	// of the existing `params` or view.data because both variables are pointers.
 	// It needs to merge the values of the two maps into a new map.
 	variables := gutil.MapMergeCopy(params...)
 	if len(view.data) > 0 {
@@ -216,10 +216,10 @@ func (view *View) ParseContent(ctx context.Context, content string, params ...Pa
 	return result, nil
 }
 
-// getTemplate returns the template object associated with given template file <path>.
+// getTemplate returns the template object associated with given template file `path`.
 // It uses template cache to enhance performance, that is, it will return the same template object
-// with the same given <path>. It will also automatically refresh the template cache
-// if the template files under <path> changes (recursively).
+// with the same given `path`. It will also automatically refresh the template cache
+// if the template files under `path` changes (recursively).
 func (view *View) getTemplate(filePath, folderPath, pattern string) (tpl interface{}, err error) {
 	// Key for template cache.
 	key := fmt.Sprintf("%s_%v", filePath, view.config.Delimiters)
@@ -304,9 +304,9 @@ func (view *View) formatTemplateObjectCreatingError(filePath, tplName string, er
 	return nil
 }
 
-// searchFile returns the found absolute path for <file> and its template folder path.
-// Note that, the returned <folder> is the template folder path, but not the folder of
-// the returned template file <path>.
+// searchFile returns the found absolute path for `file` and its template folder path.
+// Note that, the returned `folder` is the template folder path, but not the folder of
+// the returned template file `path`.
 func (view *View) searchFile(file string) (path string, folder string, resource *gres.File, err error) {
 	// Firstly checking the resource manager.
 	if !gres.IsEmpty() {
diff --git a/os/gview/gview_unit_basic_test.go b/os/gview/gview_unit_basic_test.go
index 4cad9247c..7bbdcd390 100644
--- a/os/gview/gview_unit_basic_test.go
+++ b/os/gview/gview_unit_basic_test.go
@@ -9,6 +9,7 @@ package gview_test
 import (
 	"context"
 	"github.com/gogf/gf/encoding/ghtml"
+	"github.com/gogf/gf/os/gctx"
 	"github.com/gogf/gf/os/gtime"
 	"github.com/gogf/gf/util/gconv"
 	"io/ioutil"
@@ -426,3 +427,39 @@ func Test_BuildInFuncJson(t *testing.T) {
 		t.Assert(r, `{"name":"john"}`)
 	})
 }
+
+func Test_BuildInFuncPlus(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		v := gview.New()
+		r, err := v.ParseContent(gctx.New(), "{{plus 1 2 3}}")
+		t.Assert(err, nil)
+		t.Assert(r, `6`)
+	})
+}
+
+func Test_BuildInFuncMinus(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		v := gview.New()
+		r, err := v.ParseContent(gctx.New(), "{{minus 1 2 3}}")
+		t.Assert(err, nil)
+		t.Assert(r, `-4`)
+	})
+}
+
+func Test_BuildInFuncTimes(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		v := gview.New()
+		r, err := v.ParseContent(gctx.New(), "{{times 1 2 3 4}}")
+		t.Assert(err, nil)
+		t.Assert(r, `24`)
+	})
+}
+
+func Test_BuildInFuncDivide(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		v := gview.New()
+		r, err := v.ParseContent(gctx.New(), "{{divide 8 2 2}}")
+		t.Assert(err, nil)
+		t.Assert(r, `2`)
+	})
+}

From f9eaa8f930b17d0c57dbaa515a96bfd2b700af12 Mon Sep 17 00:00:00 2001
From: John Guo <john@johng.cn>
Date: Wed, 25 Aug 2021 22:31:59 +0800
Subject: [PATCH 7/8] fix issue of nested transaction missing in function
 operations for package gdb

---
 database/gdb/gdb_core.go                     |  4 ---
 database/gdb/gdb_core_underlying.go          | 30 ++++++++++++++++--
 database/gdb/gdb_z_mysql_transaction_test.go | 32 ++++++++++++++++++++
 3 files changed, 59 insertions(+), 7 deletions(-)

diff --git a/database/gdb/gdb_core.go b/database/gdb/gdb_core.go
index 7b76f5dca..58519e927 100644
--- a/database/gdb/gdb_core.go
+++ b/database/gdb/gdb_core.go
@@ -38,10 +38,6 @@ func (c *Core) Ctx(ctx context.Context) DB {
 	if ctx == nil {
 		return c.db
 	}
-	// It is already set context in previous chaining operation.
-	if c.ctx != nil {
-		return c.db
-	}
 	ctx = context.WithValue(ctx, ctxStrictKeyName, 1)
 	// It makes a shallow copy of current db and changes its context for next chaining operation.
 	var (
diff --git a/database/gdb/gdb_core_underlying.go b/database/gdb/gdb_core_underlying.go
index 8e88d0938..036ed3494 100644
--- a/database/gdb/gdb_core_underlying.go
+++ b/database/gdb/gdb_core_underlying.go
@@ -27,10 +27,15 @@ func (c *Core) Query(sql string, args ...interface{}) (rows *sql.Rows, err error
 func (c *Core) DoQuery(ctx context.Context, link Link, sql string, args ...interface{}) (rows *sql.Rows, err error) {
 	// Transaction checks.
 	if link == nil {
-		if link, err = c.SlaveLink(); err != nil {
+		if tx := TXFromCtx(ctx, c.db.GetGroup()); tx != nil {
+			// Firstly, check and retrieve transaction link from context.
+			link = &txLink{tx.tx}
+		} else if link, err = c.SlaveLink(); err != nil {
+			// Or else it creates one from master node.
 			return nil, err
 		}
 	} else if !link.IsTransaction() {
+		// If current link is not transaction link, it checks and retrieves transaction from context.
 		if tx := TXFromCtx(ctx, c.db.GetGroup()); tx != nil {
 			link = &txLink{tx.tx}
 		}
@@ -84,10 +89,15 @@ func (c *Core) Exec(sql string, args ...interface{}) (result sql.Result, err err
 func (c *Core) DoExec(ctx context.Context, link Link, sql string, args ...interface{}) (result sql.Result, err error) {
 	// Transaction checks.
 	if link == nil {
-		if link, err = c.MasterLink(); err != nil {
+		if tx := TXFromCtx(ctx, c.db.GetGroup()); tx != nil {
+			// Firstly, check and retrieve transaction link from context.
+			link = &txLink{tx.tx}
+		} else if link, err = c.MasterLink(); err != nil {
+			// Or else it creates one from master node.
 			return nil, err
 		}
 	} else if !link.IsTransaction() {
+		// If current link is not transaction link, it checks and retrieves transaction from context.
 		if tx := TXFromCtx(ctx, c.db.GetGroup()); tx != nil {
 			link = &txLink{tx.tx}
 		}
@@ -170,11 +180,25 @@ func (c *Core) Prepare(sql string, execOnMaster ...bool) (*Stmt, error) {
 
 // DoPrepare calls prepare function on given link object and returns the statement object.
 func (c *Core) DoPrepare(ctx context.Context, link Link, sql string) (*Stmt, error) {
-	if link != nil && !link.IsTransaction() {
+	// Transaction checks.
+	if link == nil {
+		if tx := TXFromCtx(ctx, c.db.GetGroup()); tx != nil {
+			// Firstly, check and retrieve transaction link from context.
+			link = &txLink{tx.tx}
+		} else {
+			// Or else it creates one from master node.
+			var err error
+			if link, err = c.MasterLink(); err != nil {
+				return nil, err
+			}
+		}
+	} else if !link.IsTransaction() {
+		// If current link is not transaction link, it checks and retrieves transaction from context.
 		if tx := TXFromCtx(ctx, c.db.GetGroup()); tx != nil {
 			link = &txLink{tx.tx}
 		}
 	}
+
 	if c.GetConfig().PrepareTimeout > 0 {
 		// DO NOT USE cancel function in prepare statement.
 		ctx, _ = context.WithTimeout(ctx, c.GetConfig().PrepareTimeout)
diff --git a/database/gdb/gdb_z_mysql_transaction_test.go b/database/gdb/gdb_z_mysql_transaction_test.go
index 669055145..d12ff51e4 100644
--- a/database/gdb/gdb_z_mysql_transaction_test.go
+++ b/database/gdb/gdb_z_mysql_transaction_test.go
@@ -9,6 +9,7 @@ package gdb_test
 import (
 	"context"
 	"fmt"
+	"github.com/gogf/gf/os/gctx"
 	"testing"
 
 	"github.com/gogf/gf/database/gdb"
@@ -1116,3 +1117,34 @@ func Test_Transaction_Nested_SavePoint_RollbackTo(t *testing.T) {
 		t.Assert(all[0]["id"], 1)
 	})
 }
+
+func Test_Transaction_Method(t *testing.T) {
+	table := createTable()
+	defer dropTable(table)
+
+	gtest.C(t, func(t *gtest.T) {
+		var err error
+		err = db.Transaction(gctx.New(), func(ctx context.Context, tx *gdb.TX) error {
+			_, err = db.Model(table).Ctx(ctx).Data(g.Map{
+				"id":          1,
+				"passport":    "t1",
+				"password":    "25d55ad283aa400af464c76d713c07ad",
+				"nickname":    "T1",
+				"create_time": gtime.Now().String(),
+			}).Insert()
+			t.AssertNil(err)
+
+			_, err = db.Ctx(ctx).Exec(fmt.Sprintf(
+				"insert into %s(`passport`,`password`,`nickname`,`create_time`,`id`) "+
+					"VALUES('t2','25d55ad283aa400af464c76d713c07ad','T2','2021-08-25 21:53:00',2) ",
+				table))
+			t.AssertNil(err)
+			return gerror.New("rollback")
+		})
+		t.AssertNE(err, nil)
+
+		count, err := db.Model(table).Count()
+		t.AssertNil(err)
+		t.Assert(count, 0)
+	})
+}

From e0a3233ea3cc05bdc5e92e5d3a16335a0afa6250 Mon Sep 17 00:00:00 2001
From: John <john@johng.cn>
Date: Thu, 26 Aug 2021 00:11:27 +0800
Subject: [PATCH 8/8] improve package gcron

---
 go.sum                     | 24 +++----------
 os/gcron/gcron_schedule.go | 73 +++++++++++++++++++++-----------------
 2 files changed, 45 insertions(+), 52 deletions(-)

diff --git a/go.sum b/go.sum
index 181576aa5..45bd2270a 100644
--- a/go.sum
+++ b/go.sum
@@ -2,10 +2,8 @@ github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/clbanning/mxj v1.8.5-0.20200714211355-ff02cfb8ea28 h1:LdXxtjzvZYhhUaonAaAKArG3pyC67kGL3YY+6hGG8G4=
 github.com/clbanning/mxj v1.8.5-0.20200714211355-ff02cfb8ea28/go.mod h1:BVjHeAH+rl9rs6f+QIpeRl0tfu10SXn1pUSa5PVGJng=
-github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fatih/color v1.12.0 h1:mRhaKNwANqRgUBGKmnI5ZxEk7QXmjQeCcuYFMX2bfcc=
 github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
@@ -20,25 +18,16 @@ github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0U
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/grokify/html-strip-tags-go v0.0.0-20190921062105-daaa06bf1aaf h1:wIOAyJMMen0ELGiFzlmqxdcV1yGbkyHBAB6PolcNbLA=
 github.com/grokify/html-strip-tags-go v0.0.0-20190921062105-daaa06bf1aaf/go.mod h1:2Su6romC5/1VXOQMaWL2yb618ARB8iVo6/DR99A6d78=
-github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
-github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
 github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/mattn/go-runewidth v0.0.9 h1:Lm995f3rfxdpd6TSmuVCHVb/QhupuXlYr8sCI/QdE+0=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/mattn/go-runewidth v0.0.10 h1:CoZ3S2P7pvtP45xOtBw+/mDL2z0RKI576gSkzRRpdGg=
-github.com/mattn/go-runewidth v0.0.10/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
-github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
 github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/rivo/uniseg v0.1.0 h1:+2KBaVoUmb9XzDsrx/Ct0W/EYOSFf/nWTauy++DprtY=
-github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
@@ -55,19 +44,16 @@ golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210616094352-59db8d763f22 h1:RqytpXGR1iVNX7psjB3ff8y7sNFinVFvkx1c8SjBkio=
-golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
-gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
diff --git a/os/gcron/gcron_schedule.go b/os/gcron/gcron_schedule.go
index 7ff33d03e..8bfb68a35 100644
--- a/os/gcron/gcron_schedule.go
+++ b/os/gcron/gcron_schedule.go
@@ -33,6 +33,10 @@ type cronSchedule struct {
 const (
 	// regular expression for cron pattern, which contains 6 parts of time units.
 	regexForCron = `^([\-/\d\*\?,]+)\s+([\-/\d\*\?,]+)\s+([\-/\d\*\?,]+)\s+([\-/\d\*\?,]+)\s+([\-/\d\*\?,A-Za-z]+)\s+([\-/\d\*\?,A-Za-z]+)$`
+
+	patternItemTypeUnknown = iota
+	patternItemTypeWeek
+	patternItemTypeMonth
 )
 
 var (
@@ -103,37 +107,37 @@ func newSchedule(pattern string) (*cronSchedule, error) {
 			pattern: pattern,
 		}
 		// Second.
-		if m, err := parseItem(match[1], 0, 59, false); err != nil {
+		if m, err := parsePatternItem(match[1], 0, 59, false); err != nil {
 			return nil, err
 		} else {
 			schedule.second = m
 		}
 		// Minute.
-		if m, err := parseItem(match[2], 0, 59, false); err != nil {
+		if m, err := parsePatternItem(match[2], 0, 59, false); err != nil {
 			return nil, err
 		} else {
 			schedule.minute = m
 		}
 		// Hour.
-		if m, err := parseItem(match[3], 0, 23, false); err != nil {
+		if m, err := parsePatternItem(match[3], 0, 23, false); err != nil {
 			return nil, err
 		} else {
 			schedule.hour = m
 		}
 		// Day.
-		if m, err := parseItem(match[4], 1, 31, true); err != nil {
+		if m, err := parsePatternItem(match[4], 1, 31, true); err != nil {
 			return nil, err
 		} else {
 			schedule.day = m
 		}
 		// Month.
-		if m, err := parseItem(match[5], 1, 12, false); err != nil {
+		if m, err := parsePatternItem(match[5], 1, 12, false); err != nil {
 			return nil, err
 		} else {
 			schedule.month = m
 		}
 		// Week.
-		if m, err := parseItem(match[6], 0, 6, true); err != nil {
+		if m, err := parsePatternItem(match[6], 0, 6, true); err != nil {
 			return nil, err
 		} else {
 			schedule.week = m
@@ -144,52 +148,55 @@ func newSchedule(pattern string) (*cronSchedule, error) {
 	}
 }
 
-// parseItem parses every item in the pattern and returns the result as map.
-func parseItem(item string, min int, max int, allowQuestionMark bool) (map[int]struct{}, error) {
+// parsePatternItem parses every item in the pattern and returns the result as map, which is used for indexing.
+func parsePatternItem(item string, min int, max int, allowQuestionMark bool) (map[int]struct{}, error) {
 	m := make(map[int]struct{}, max-min+1)
 	if item == "*" || (allowQuestionMark && item == "?") {
 		for i := min; i <= max; i++ {
 			m[i] = struct{}{}
 		}
 	} else {
+		// Like: MON,FRI
 		for _, item := range strings.Split(item, ",") {
-			interval := 1
-			intervalArray := strings.Split(item, "/")
+			var (
+				interval      = 1
+				intervalArray = strings.Split(item, "/")
+			)
 			if len(intervalArray) == 2 {
-				if i, err := strconv.Atoi(intervalArray[1]); err != nil {
+				if number, err := strconv.Atoi(intervalArray[1]); err != nil {
 					return nil, gerror.NewCodef(gcode.CodeInvalidParameter, `invalid pattern item: "%s"`, item)
 				} else {
-					interval = i
+					interval = number
 				}
 			}
 			var (
 				rangeMin   = min
 				rangeMax   = max
-				fieldType  = byte(0)
+				itemType   = patternItemTypeUnknown
 				rangeArray = strings.Split(intervalArray[0], "-") // Like: 1-30, JAN-DEC
 			)
 			switch max {
 			case 6:
 				// It's checking week field.
-				fieldType = 'w'
+				itemType = patternItemTypeWeek
 			case 12:
 				// It's checking month field.
-				fieldType = 'm'
+				itemType = patternItemTypeMonth
 			}
 			// Eg: */5
 			if rangeArray[0] != "*" {
-				if i, err := parseItemValue(rangeArray[0], fieldType); err != nil {
+				if number, err := parsePatternItemValue(rangeArray[0], itemType); err != nil {
 					return nil, gerror.NewCodef(gcode.CodeInvalidParameter, `invalid pattern item: "%s"`, item)
 				} else {
-					rangeMin = i
-					rangeMax = i
+					rangeMin = number
+					rangeMax = number
 				}
 			}
 			if len(rangeArray) == 2 {
-				if i, err := parseItemValue(rangeArray[1], fieldType); err != nil {
+				if number, err := parsePatternItemValue(rangeArray[1], itemType); err != nil {
 					return nil, gerror.NewCodef(gcode.CodeInvalidParameter, `invalid pattern item: "%s"`, item)
 				} else {
-					rangeMax = i
+					rangeMax = number
 				}
 			}
 			for i := rangeMin; i <= rangeMax; i += interval {
@@ -200,24 +207,24 @@ func parseItem(item string, min int, max int, allowQuestionMark bool) (map[int]s
 	return m, nil
 }
 
-// parseItemValue parses the field value to a number according to its field type.
-func parseItemValue(value string, fieldType byte) (int, error) {
+// parsePatternItemValue parses the field value to a number according to its field type.
+func parsePatternItemValue(value string, itemType int) (int, error) {
 	if gregex.IsMatchString(`^\d+$`, value) {
-		// Pure number.
-		if i, err := strconv.Atoi(value); err == nil {
-			return i, nil
+		// It is pure number.
+		if number, err := strconv.Atoi(value); err == nil {
+			return number, nil
 		}
 	} else {
-		// Check if contains letter,
+		// Check if it contains letter,
 		// it converts the value to number according to predefined map.
-		switch fieldType {
-		case 'm':
-			if i, ok := monthMap[strings.ToLower(value)]; ok {
-				return i, nil
+		switch itemType {
+		case patternItemTypeWeek:
+			if number, ok := monthMap[strings.ToLower(value)]; ok {
+				return number, nil
 			}
-		case 'w':
-			if i, ok := weekMap[strings.ToLower(value)]; ok {
-				return i, nil
+		case patternItemTypeMonth:
+			if number, ok := weekMap[strings.ToLower(value)]; ok {
+				return number, nil
 			}
 		}
 	}