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convert.go
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convert.go
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package reorg
import (
"fmt"
"reflect"
"strings"
"time"
"github.com/alpacahq/marketstore/v4/utils/log"
)
var TIME = reflect.TypeOf(time.Time{}).Name()
const exampleFloat = 1.2
var (
UINT = reflect.TypeOf(uint(1)).Name()
UINT8 = reflect.TypeOf(uint8(1)).Name()
UINT16 = reflect.TypeOf(uint16(1)).Name()
UINT32 = reflect.TypeOf(uint32(1)).Name()
UINT64 = reflect.TypeOf(uint64(1)).Name()
INT = reflect.TypeOf(1).Name()
INT8 = reflect.TypeOf(int8(1)).Name()
INT16 = reflect.TypeOf(int16(1)).Name()
INT32 = reflect.TypeOf(int32(1)).Name()
INT64 = reflect.TypeOf(int64(1)).Name()
FLOAT = reflect.TypeOf(exampleFloat).Name()
STRING = reflect.TypeOf("").Name()
)
type typeConverter func(str string, v reflect.Value, format string) error
var converters = map[string]typeConverter{
UINT: stringToUint,
UINT8: stringToUint,
UINT16: stringToUint,
UINT32: stringToUint,
UINT64: stringToUint,
INT: stringToInt,
INT8: stringToInt,
INT16: stringToInt,
INT32: stringToInt,
INT64: stringToInt,
FLOAT: stringToFloat,
STRING: stringToString,
TIME: stringToTime,
}
var formatDefaults = map[string]string{
INT: "%d",
INT8: "%d",
INT16: "%d",
INT32: "%d",
INT64: "%d",
UINT: "%d",
UINT8: "%d",
UINT16: "%d",
UINT32: "%d",
UINT64: "%d",
FLOAT: "%f",
TIME: "01/02/06",
}
func stringToUint(str string, v reflect.Value, format string) error {
var val uint64
n, err := fmt.Sscanf(str, format, &val)
if n == 1 {
v.SetUint(val)
}
return err
}
func stringToInt(str string, v reflect.Value, format string) error {
var val int64
n, err := fmt.Sscanf(str, format, &val)
if n == 1 {
v.SetInt(val)
}
return err
}
func stringToFloat(str string, v reflect.Value, format string) error {
var f float64
n, err := fmt.Sscanf(str, format, &f)
if n == 1 {
v.SetFloat(f)
}
return err
}
func stringToString(str string, v reflect.Value, format string) error {
v.SetString(str)
return nil
}
func stringToTime(str string, v reflect.Value, format string) error {
// allow blank time fields
if str == "99/99/99" || str == "/ /" || str == "" {
return nil
}
t, err := time.Parse(format, str)
if err == nil {
v.Set(reflect.ValueOf(t))
}
return err
}
func getConverter(t reflect.Type) typeConverter {
f := converters[t.Name()]
if f == nil {
f = converters[t.Kind().String()]
}
return f
}
func getFormatter(t reflect.Type) string {
format := formatDefaults[t.Name()]
if format == "" {
format = formatDefaults[t.Kind().String()]
}
return format
}
func convert(input, format, def string, v reflect.Value) {
cleanInput := strings.TrimSpace(input)
if cleanInput == "" && len(def) > 0 {
cleanInput = strings.TrimSpace(def)
}
if cleanInput == "" {
return
}
defer func() {
err := recover()
if err != nil {
log.Error("panic at conversion: %+v\n input: %s\n", err, input)
}
}()
iv := reflect.Indirect(v)
if iv.CanSet() {
f := getConverter(iv.Type())
if f != nil {
if format == "" {
format = getFormatter(iv.Type())
}
err := f(cleanInput, iv, format)
if err != nil {
log.Error("type conversion error: %+v, %s\n", err, input)
}
} else {
// nolint:forbidigo // CLI output needs fmt.Println
println("converter not found for", input, v.Type().Name(), "kind:", iv.Kind())
}
} else {
// nolint:forbidigo // CLI output needs fmt.Println
println("value is read only!!!! ", input, " to ", v.Type().Name())
}
}