gitea/vendor/xorm.io/xorm/convert.go
2021-07-04 15:10:46 +02:00

379 lines
8.9 KiB
Go
Vendored

// Copyright 2017 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xorm
import (
"database/sql/driver"
"errors"
"fmt"
"reflect"
"strconv"
"time"
)
var errNilPtr = errors.New("destination pointer is nil") // embedded in descriptive error
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 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
}
// 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 []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 time.Time:
switch d := dest.(type) {
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 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
}
}
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 *bool:
bv, err := driver.Bool.ConvertValue(src)
if err == nil {
*d = bv.(bool)
}
return err
case *interface{}:
*d = src
return nil
}
return convertAssignV(reflect.ValueOf(dest), src)
}
func convertAssignV(dpv reflect.Value, src interface{}) error {
if dpv.Kind() != reflect.Ptr {
return errors.New("destination not a pointer")
}
if dpv.IsNil() {
return errNilPtr
}
var 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
}
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:
dv.SetString(asString(src))
return nil
}
return fmt.Errorf("unsupported Scan, storing driver.Value type %T into type %T", src, dpv.Interface())
}
func asKind(vv reflect.Value, tp reflect.Type) (interface{}, error) {
switch tp.Kind() {
case reflect.Int64:
return vv.Int(), nil
case reflect.Int:
return int(vv.Int()), nil
case reflect.Int32:
return int32(vv.Int()), nil
case reflect.Int16:
return int16(vv.Int()), nil
case reflect.Int8:
return int8(vv.Int()), nil
case reflect.Uint64:
return vv.Uint(), nil
case reflect.Uint:
return uint(vv.Uint()), nil
case reflect.Uint32:
return uint32(vv.Uint()), nil
case reflect.Uint16:
return uint16(vv.Uint()), nil
case reflect.Uint8:
return uint8(vv.Uint()), nil
case reflect.String:
return vv.String(), nil
case reflect.Slice:
if tp.Elem().Kind() == reflect.Uint8 {
v, err := strconv.ParseInt(string(vv.Interface().([]byte)), 10, 64)
if err != nil {
return nil, err
}
return v, nil
}
}
return nil, fmt.Errorf("unsupported primary key type: %v, %v", tp, vv)
}
func asBool(bs []byte) (bool, error) {
if len(bs) == 0 {
return false, nil
}
if bs[0] == 0x00 {
return false, nil
} else if bs[0] == 0x01 {
return true, nil
}
return strconv.ParseBool(string(bs))
}
// str2PK convert string value to primary key value according to tp
func str2PKValue(s string, tp reflect.Type) (reflect.Value, error) {
var err error
var result interface{}
var defReturn = reflect.Zero(tp)
switch tp.Kind() {
case reflect.Int:
result, err = strconv.Atoi(s)
if err != nil {
return defReturn, fmt.Errorf("convert %s as int: %s", s, err.Error())
}
case reflect.Int8:
x, err := strconv.Atoi(s)
if err != nil {
return defReturn, fmt.Errorf("convert %s as int8: %s", s, err.Error())
}
result = int8(x)
case reflect.Int16:
x, err := strconv.Atoi(s)
if err != nil {
return defReturn, fmt.Errorf("convert %s as int16: %s", s, err.Error())
}
result = int16(x)
case reflect.Int32:
x, err := strconv.Atoi(s)
if err != nil {
return defReturn, fmt.Errorf("convert %s as int32: %s", s, err.Error())
}
result = int32(x)
case reflect.Int64:
result, err = strconv.ParseInt(s, 10, 64)
if err != nil {
return defReturn, fmt.Errorf("convert %s as int64: %s", s, err.Error())
}
case reflect.Uint:
x, err := strconv.ParseUint(s, 10, 64)
if err != nil {
return defReturn, fmt.Errorf("convert %s as uint: %s", s, err.Error())
}
result = uint(x)
case reflect.Uint8:
x, err := strconv.ParseUint(s, 10, 64)
if err != nil {
return defReturn, fmt.Errorf("convert %s as uint8: %s", s, err.Error())
}
result = uint8(x)
case reflect.Uint16:
x, err := strconv.ParseUint(s, 10, 64)
if err != nil {
return defReturn, fmt.Errorf("convert %s as uint16: %s", s, err.Error())
}
result = uint16(x)
case reflect.Uint32:
x, err := strconv.ParseUint(s, 10, 64)
if err != nil {
return defReturn, fmt.Errorf("convert %s as uint32: %s", s, err.Error())
}
result = uint32(x)
case reflect.Uint64:
result, err = strconv.ParseUint(s, 10, 64)
if err != nil {
return defReturn, fmt.Errorf("convert %s as uint64: %s", s, err.Error())
}
case reflect.String:
result = s
default:
return defReturn, errors.New("unsupported convert type")
}
return reflect.ValueOf(result).Convert(tp), nil
}
func str2PK(s string, tp reflect.Type) (interface{}, error) {
v, err := str2PKValue(s, tp)
if err != nil {
return nil, err
}
return v.Interface(), nil
}