From 6da972b1128ae57ffe3c44a0e281522e8dd057a4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=99=BD=E8=8C=B6=E6=B8=85=E6=AC=A2?= Date: Wed, 27 Dec 2023 17:59:33 +0800 Subject: [PATCH] migrate ConverAssign --- convert.go | 394 +++++++++++++++++++++++++++++++++++++++++++++++++++++ go.mod | 2 +- go.sum | 14 +- string.go | 27 ++-- 4 files changed, 412 insertions(+), 25 deletions(-) create mode 100644 convert.go diff --git a/convert.go b/convert.go new file mode 100644 index 0000000..05c0331 --- /dev/null +++ b/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 +} diff --git a/go.mod b/go.mod index 22eed4c..e0ec1d5 100644 --- a/go.mod +++ b/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 diff --git a/go.sum b/go.sum index 481ffaa..ce50060 100644 --- a/go.sum +++ b/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 v0.0.0-20230815042559-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= diff --git a/string.go b/string.go index 5b1a440..596ca3f 100644 --- a/string.go +++ b/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 }