migrate ConverAssign

convert.go

@@ -0,0 +1,394 @@
+// Package wrapper ...
+//
+// Description : 任意类型之间的相互转换
+//
+// Author : go_developer@163.com<白茶清欢>
+//
+// Date : 2021-02-23 10:23 下午
+package wrapper
+
+/*
+   Desc : 在处理一些参数的时候，可能需要将参数转换为各种类型，这里实现一个通用的转换函数，实现各种类型之间的相互转换。
+
+    当然，如果源数据格式和目标数据类型不一致，是会返回错误的。例如将字符串“一二三”转换为数值类型则会报错，而将字符串“123”转换为数值类型则OK。
+
+    这段代码实际抄自go自带的“database/sql”库，只是源代码作为内部函数无法在外面调用，可以单独把需要的功能拎出来使用：
+
+    代码中有一个Scaner接口，可以自行实现，然后通过"convertAssign()"函数，作为dst参数传入。
+
+   Author : zhangdeman001@ke.com<白茶清欢>
+
+*/
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strconv"
+	"time"
+)
+
+// RawBytes is a byte slice that holds a reference to memory owned by
+// the database itself. After a Scan into a RawBytes, the slice is only
+// valid until the next call to Next, Scan, or Close.
+type RawBytes []byte
+
+var errNilPtr = errors.New("destination pointer is nil") // embedded in descriptive error
+
+// ConvertAssign ...
+// convertAssign copies to dest the value in src, converting it if possible.
+// An error is returned if the copy would result in loss of information.
+// dest should be a pointer type.
+func ConvertAssign(dest, src interface{}) error {
+	// Common cases, without reflect.
+	switch s := src.(type) {
+	case string:
+		switch d := dest.(type) {
+		case *string:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = s
+			return nil
+		case *[]byte:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = []byte(s)
+			return nil
+		case *RawBytes:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = append((*d)[:0], s...)
+			return nil
+		}
+	case []byte:
+		switch d := dest.(type) {
+		case *string:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = string(s)
+			return nil
+		case *interface{}:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = cloneBytes(s)
+			return nil
+		case *[]byte:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = cloneBytes(s)
+			return nil
+		case *RawBytes:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = s
+			return nil
+		}
+	case time.Time:
+		switch d := dest.(type) {
+		case *time.Time:
+			*d = s
+			return nil
+		case *string:
+			*d = s.Format(time.RFC3339Nano)
+			return nil
+		case *[]byte:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = []byte(s.Format(time.RFC3339Nano))
+			return nil
+		case *RawBytes:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = s.AppendFormat((*d)[:0], time.RFC3339Nano)
+			return nil
+		}
+	case nil:
+		switch d := dest.(type) {
+		case *interface{}:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = nil
+			return nil
+		case *[]byte:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = nil
+			return nil
+		case *RawBytes:
+			if d == nil {
+				return errNilPtr
+			}
+			*d = nil
+			return nil
+		}
+	}
+
+	var sv reflect.Value
+
+	switch d := dest.(type) {
+	case *string:
+		sv = reflect.ValueOf(src)
+		switch sv.Kind() {
+		case reflect.Bool,
+			reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+			reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
+			reflect.Float32, reflect.Float64:
+			*d = asString(src)
+			return nil
+		}
+	case *[]byte:
+		sv = reflect.ValueOf(src)
+		if b, ok := asBytes(nil, sv); ok {
+			*d = b
+			return nil
+		}
+	case *RawBytes:
+		sv = reflect.ValueOf(src)
+		if b, ok := asBytes([]byte(*d)[:0], sv); ok {
+			*d = RawBytes(b)
+			return nil
+		}
+	case *bool:
+		bv, err := Bool.ConvertValue(src)
+		if err == nil {
+			*d = bv.(bool)
+		}
+		return err
+	case *interface{}:
+		*d = src
+		return nil
+	}
+
+	if scanner, ok := dest.(Scanner); ok {
+		return scanner.Scan(src)
+	}
+
+	dpv := reflect.ValueOf(dest)
+	if dpv.Kind() != reflect.Ptr {
+		return errors.New("destination not a pointer")
+	}
+	if dpv.IsNil() {
+		return errNilPtr
+	}
+
+	if !sv.IsValid() {
+		sv = reflect.ValueOf(src)
+	}
+
+	dv := reflect.Indirect(dpv)
+	if sv.IsValid() && sv.Type().AssignableTo(dv.Type()) {
+		switch b := src.(type) {
+		case []byte:
+			dv.Set(reflect.ValueOf(cloneBytes(b)))
+		default:
+			dv.Set(sv)
+		}
+		return nil
+	}
+
+	if dv.Kind() == sv.Kind() && sv.Type().ConvertibleTo(dv.Type()) {
+		dv.Set(sv.Convert(dv.Type()))
+		return nil
+	}
+
+	// The following conversions use a string value as an intermediate representation
+	// to convert between various numeric types.
+	//
+	// This also allows scanning into user defined types such as "type Int int64".
+	// For symmetry, also check for string destination types.
+	switch dv.Kind() {
+	case reflect.Ptr:
+		if src == nil {
+			dv.Set(reflect.Zero(dv.Type()))
+			return nil
+		}
+		dv.Set(reflect.New(dv.Type().Elem()))
+		return ConvertAssign(dv.Interface(), src)
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		s := asString(src)
+		i64, err := strconv.ParseInt(s, 10, dv.Type().Bits())
+		if err != nil {
+			err = strconvErr(err)
+			return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
+		}
+		dv.SetInt(i64)
+		return nil
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		s := asString(src)
+		u64, err := strconv.ParseUint(s, 10, dv.Type().Bits())
+		if err != nil {
+			err = strconvErr(err)
+			return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
+		}
+		dv.SetUint(u64)
+		return nil
+	case reflect.Float32, reflect.Float64:
+		s := asString(src)
+		f64, err := strconv.ParseFloat(s, dv.Type().Bits())
+		if err != nil {
+			err = strconvErr(err)
+			return fmt.Errorf("converting driver.Value type %T (%q) to a %s: %v", src, s, dv.Kind(), err)
+		}
+		dv.SetFloat(f64)
+		return nil
+	case reflect.String:
+		switch v := src.(type) {
+		case string:
+			dv.SetString(v)
+			return nil
+		case []byte:
+			dv.SetString(string(v))
+			return nil
+		}
+	}
+
+	return fmt.Errorf("unsupported Scan, storing driver.Value type %T into type %T", src, dest)
+}
+
+func strconvErr(err error) error {
+	if ne, ok := err.(*strconv.NumError); ok {
+		return ne.Err
+	}
+	return err
+}
+
+func cloneBytes(b []byte) []byte {
+	if b == nil {
+		return nil
+	}
+	c := make([]byte, len(b))
+	copy(c, b)
+	return c
+}
+
+func ToString(src interface{}) string {
+	return asString(src)
+}
+
+func asString(src interface{}) string {
+	switch v := src.(type) {
+	case string:
+		return v
+	case []byte:
+		return string(v)
+	}
+	rv := reflect.ValueOf(src)
+	switch rv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return strconv.FormatInt(rv.Int(), 10)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return strconv.FormatUint(rv.Uint(), 10)
+	case reflect.Float64:
+		return strconv.FormatFloat(rv.Float(), 'g', -1, 64)
+	case reflect.Float32:
+		return strconv.FormatFloat(rv.Float(), 'g', -1, 32)
+	case reflect.Bool:
+		return strconv.FormatBool(rv.Bool())
+	}
+	return fmt.Sprintf("%v", src)
+}
+
+func asBytes(buf []byte, rv reflect.Value) (b []byte, ok bool) {
+	switch rv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return strconv.AppendInt(buf, rv.Int(), 10), true
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		return strconv.AppendUint(buf, rv.Uint(), 10), true
+	case reflect.Float32:
+		return strconv.AppendFloat(buf, rv.Float(), 'g', -1, 32), true
+	case reflect.Float64:
+		return strconv.AppendFloat(buf, rv.Float(), 'g', -1, 64), true
+	case reflect.Bool:
+		return strconv.AppendBool(buf, rv.Bool()), true
+	case reflect.String:
+		s := rv.String()
+		return append(buf, s...), true
+	}
+	return
+}
+
+// Value is a value that drivers must be able to handle.
+// It is either nil, a type handled by a database driver's NamedValueChecker
+// interface, or an instance of one of these types:
+//
+//	int64
+//	float64
+//	bool
+//	[]byte
+//	string
+//	time.Time
+type Value interface{}
+
+type boolType struct{}
+
+var Bool boolType
+
+func (boolType) String() string { return "Bool" }
+func (boolType) ConvertValue(src interface{}) (Value, error) {
+	switch s := src.(type) {
+	case bool:
+		return s, nil
+	case string:
+		b, err := strconv.ParseBool(s)
+		if err != nil {
+			return nil, fmt.Errorf("sql/driver: couldn't convert %q into type bool", s)
+		}
+		return b, nil
+	case []byte:
+		b, err := strconv.ParseBool(string(s))
+		if err != nil {
+			return nil, fmt.Errorf("sql/driver: couldn't convert %q into type bool", s)
+		}
+		return b, nil
+	}
+
+	sv := reflect.ValueOf(src)
+	switch sv.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		iv := sv.Int()
+		if iv == 1 || iv == 0 {
+			return iv == 1, nil
+		}
+		return nil, fmt.Errorf("sql/driver: couldn't convert %d into type bool", iv)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		uv := sv.Uint()
+		if uv == 1 || uv == 0 {
+			return uv == 1, nil
+		}
+		return nil, fmt.Errorf("sql/driver: couldn't convert %d into type bool", uv)
+	}
+
+	return nil, fmt.Errorf("sql/driver: couldn't convert %v (%T) into type bool", src, src)
+}
+
+type Scanner interface {
+	// Scan assigns a value from a database driver.
+	//
+	// The src value will be of one of the following types:
+	//
+	//    int64
+	//    float64
+	//    bool
+	//    []byte
+	//    string
+	//    time.Time
+	//    nil - for NULL values
+	//
+	// An error should be returned if the value cannot be stored
+	// without loss of information.
+	//
+	// Reference types such as []byte are only valid until the next call to Scan
+	// and should not be retained. Their underlying memory is owned by the driver.
+	// If retention is necessary, copy their values before the next call to Scan.
+	Scan(src interface{}) error
+}

go.mod

@@ -7,12 +7,12 @@ toolchain go1.21.4
 require (
 	git.zhangdeman.cn/zhangdeman/easymap v0.0.0-20231224145141-489e31b07a71
 	git.zhangdeman.cn/zhangdeman/serialize v0.0.0-20231224125439-01f39b6ea08d
-	git.zhangdeman.cn/zhangdeman/util v0.0.0-20231014142840-445c6407db92
 	github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394
 )
 
 require (
 	git.zhangdeman.cn/zhangdeman/consts v0.0.0-20230815040024-2b12dd51d19b // indirect
+	git.zhangdeman.cn/zhangdeman/util v0.0.0-20231227095334-7eb5cdbf9253 // indirect
 	github.com/BurntSushi/toml v1.3.2 // indirect
 	github.com/go-ini/ini v1.67.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect

go.sum

@@ -1,24 +1,17 @@
 git.zhangdeman.cn/zhangdeman/consts v0.0.0-20230815040024-2b12dd51d19b h1:C7KftnLh7dOqzNRs5dn/9yqMDvuqMn5RCglvV6bY758=
 git.zhangdeman.cn/zhangdeman/consts v0.0.0-20230815040024-2b12dd51d19b/go.mod h1:IXXaZkb7vGzGnGM5RRWrASAuwrVSNxuoe0DmeXx5g6k=
-git.zhangdeman.cn/zhangdeman/easymap v0.0.0-20230826152035-90f7ba59144a h1:B37yGkb/ETYInbS3j5JR6lgXPsvGjKcY26fsIlSpKxA=
-git.zhangdeman.cn/zhangdeman/easymap v0.0.0-20230826152035-90f7ba59144a/go.mod h1:l9S40lsDnTd/VAZjh1kmfYvz0B9z+7oT86pMQ/KurWo=
 git.zhangdeman.cn/zhangdeman/easymap v0.0.0-20231224145141-489e31b07a71 h1:nvVSH+Ju8EmoPiPHTae5lxHo4kDjROYChs19Yayz+NY=
 git.zhangdeman.cn/zhangdeman/easymap v0.0.0-20231224145141-489e31b07a71/go.mod h1:SrtvrQRdzt+8KfYzvosH++gWxo2ShPTzR1m3VQ6uX7U=
-git.zhangdeman.cn/zhangdeman/serialize v0.0.0-20230909065133-098dcddf1fca h1:CoazDbdGF/bKooOdbyW4R9bmu+i+XvymKuxNFEi/UCE=
-git.zhangdeman.cn/zhangdeman/serialize v0.0.0-20230909065133-098dcddf1fca/go.mod h1:AWyjclAKRM7HiUNzm2wKhYw+s4Jz7fg8YngN+PYdKNo=
-git.zhangdeman.cn/zhangdeman/serialize v0.0.0-20231123090055-0d2a068178aa h1:l835yJ1Ja5JTCrt+FkW+IKMFalBXHHlRUvQmav2C7KA=
-git.zhangdeman.cn/zhangdeman/serialize v0.0.0-20231123090055-0d2a068178aa/go.mod h1:w7kG4zyTJ1uPFaTWhze+OQuaUBINT2XnDxpyiM6ctc0=
 git.zhangdeman.cn/zhangdeman/serialize v0.0.0-20231224125439-01f39b6ea08d h1:TV0BCQQewBEtLsv3i9gXkxLFd5A5bWBTiNd3D/I5o4Q=
 git.zhangdeman.cn/zhangdeman/serialize v0.0.0-20231224125439-01f39b6ea08d/go.mod h1:w7kG4zyTJ1uPFaTWhze+OQuaUBINT2XnDxpyiM6ctc0=
-git.zhangdeman.cn/zhangdeman/util v0.0.0-20230815042559-b34984be7444 h1:JVp575weLUX4sfhgjjxotJPxfHio7Ua8KHH3LMRRs2E=
+git.zhangdeman.cn/zhangdeman/util v0.0.0-20231227095334-7eb5cdbf9253 h1:GO3oZa5a2sqwAzGcLDJtQzmshSWRmoP7IDS8bwFqvC4=
-git.zhangdeman.cn/zhangdeman/util v0.0.0-20230815042559-b34984be7444/go.mod h1:IqS3vAMyt1fVCWS7RqGeUw1EFnL/ruUMha45G2T+YNM=
+git.zhangdeman.cn/zhangdeman/util v0.0.0-20231227095334-7eb5cdbf9253/go.mod h1:VpPjBlwz8U+OxZuxzHQBv1aEEZ3pStH6bZvT21ADEbI=
-git.zhangdeman.cn/zhangdeman/util v0.0.0-20231014142840-445c6407db92 h1:p1GVRYJc3NNoZeLs4CukitAbM3O/ALNq3l31cnbBQDM=
-git.zhangdeman.cn/zhangdeman/util v0.0.0-20231014142840-445c6407db92/go.mod h1:6OBeuwKy2J1TjdAwStEyC6aYC3kStmJiCg1eFC7g0fk=
 github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394 h1:OYA+5W64v3OgClL+IrOD63t4i/RW7RqrAVl9LTZ9UqQ=
 github.com/axgle/mahonia v0.0.0-20180208002826-3358181d7394/go.mod h1:Q8n74mJTIgjX4RBBcHnJ05h//6/k6foqmgE45jTQtxg=
 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/go-ini/ini v1.67.0 h1:z6ZrTEZqSWOTyH2FlglNbNgARyHG8oLW9gMELqKr06A=
 github.com/go-ini/ini v1.67.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
@@ -26,6 +19,7 @@ github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrk
 github.com/mozillazg/go-pinyin v0.20.0 h1:BtR3DsxpApHfKReaPO1fCqF4pThRwH9uwvXzm+GnMFQ=
 github.com/mozillazg/go-pinyin v0.20.0/go.mod h1:iR4EnMMRXkfpFVV5FMi4FNB6wGq9NV6uDWbUuPhP4Yc=
 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/spaolacci/murmur3 v1.1.0 h1:7c1g84S4BPRrfL5Xrdp6fOJ206sU9y293DDHaoy0bLI=
 github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=

string.go

@@ -12,7 +12,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"git.zhangdeman.cn/zhangdeman/serialize"
-	"git.zhangdeman.cn/zhangdeman/util"
 	"github.com/axgle/mahonia"
 	"io"
 	"math/rand"
@@ -58,7 +57,7 @@ func (str String) ToFloat32() Float32Result {
 	var (
 		res Float32Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -90,7 +89,7 @@ func (str String) ToFloat64() Float64Result {
 	var (
 		res Float64Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -158,7 +157,7 @@ func (str String) ToInt8() Int8Result {
 	var (
 		res Int8Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -190,7 +189,7 @@ func (str String) ToInt16() Int16Result {
 	var (
 		res Int16Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -222,7 +221,7 @@ func (str String) ToInt32() Int32Result {
 	var (
 		res Int32Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -254,7 +253,7 @@ func (str String) ToInt64() Int64Result {
 	var (
 		res Int64Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -286,7 +285,7 @@ func (str String) ToInt() IntResult {
 	var (
 		res IntResult
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -318,7 +317,7 @@ func (str String) ToUint8() Uint8Result {
 	var (
 		res Uint8Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -350,7 +349,7 @@ func (str String) ToUint16() Uint16Result {
 	var (
 		res Uint16Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -382,7 +381,7 @@ func (str String) ToUint32() Uint32Result {
 	var (
 		res Uint32Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -414,7 +413,7 @@ func (str String) ToUint64() Uint64Result {
 	var (
 		res Uint64Result
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -446,7 +445,7 @@ func (str String) ToUint() UintResult {
 	var (
 		res UintResult
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }
 
@@ -478,7 +477,7 @@ func (str String) ToBool() BoolResult {
 	var (
 		res BoolResult
 	)
-	res.Err = util.ConvertAssign(&res.Value, str)
+	res.Err = ConvertAssign(&res.Value, str)
 	return res
 }