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migrate ConverAssign

This commit is contained in:
白茶清欢 2023-12-27 17:59:33 +08:00
parent d7e591277a
commit 6da972b112
4 changed files with 412 additions and 25 deletions
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394
convert.go Normal file
View File

@ -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
}

2
go.mod
View File

@ -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

14
go.sum
View File

@ -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 v0.0.0-20230815042559-b34984be7444/go.mod h1:IqS3vAMyt1fVCWS7RqGeUw1EFnL/ruUMha45G2T+YNM=
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=
git.zhangdeman.cn/zhangdeman/util v0.0.0-20231227095334-7eb5cdbf9253 h1:GO3oZa5a2sqwAzGcLDJtQzmshSWRmoP7IDS8bwFqvC4=
git.zhangdeman.cn/zhangdeman/util v0.0.0-20231227095334-7eb5cdbf9253/go.mod h1:VpPjBlwz8U+OxZuxzHQBv1aEEZ3pStH6bZvT21ADEbI=
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=

27
string.go
View File

@ -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
}