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assign.go
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assign.go
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package flatfile
import (
"reflect"
"strconv"
"unicode/utf8"
"unsafe"
"github.com/pkg/errors"
)
//assignBasedOnKind performs assignment of fieldData to field based on kind
func assignBasedOnKind(kind reflect.Kind, field reflect.Value, fieldData []byte, ffpTag *flatfileTag) error {
var err error
err = nil
switch kind {
case reflect.Bool:
err = assignBool(kind, field, fieldData)
case reflect.Uint:
err = assignUint(kind, field, fieldData)
case reflect.Uint8:
//check ffpTag.override == byte, meaning user wants to store the byte value itself
if ffpTag.override == "byte" {
err = assignByte(field, fieldData[0])
} else {
err = assignUint8(kind, field, fieldData)
}
case reflect.Uint16:
err = assignUint16(kind, field, fieldData)
case reflect.Uint32:
err = assignUint32(kind, field, fieldData)
case reflect.Uint64:
err = assignUint64(kind, field, fieldData)
case reflect.Int:
err = assignInt(kind, field, fieldData)
case reflect.Int8:
err = assignInt8(kind, field, fieldData)
case reflect.Int16:
err = assignInt16(kind, field, fieldData)
case reflect.Int32:
//check ffpTag.override == rune, meaning user wants to store the rune value itself
if ffpTag.override == "rune" {
err = assignRune(field, fieldData)
} else {
err = assignInt32(kind, field, fieldData)
}
case reflect.Int64:
err = assignInt64(kind, field, fieldData)
case reflect.Float32:
err = assignFloat32(kind, field, fieldData)
case reflect.Float64:
err = assignFloat64(kind, field, fieldData)
case reflect.String:
field.Set(reflect.ValueOf(string(fieldData)))
case reflect.Struct:
err = Unmarshal(fieldData, field.Addr().Interface(), 0, 0, false)
case reflect.Ptr:
//If pointer to struct
if field.Elem().Kind() == reflect.Struct {
//Unmarshal struct
err = Unmarshal(fieldData, field.Interface(), 0, 0, false)
} else {
err = assignBasedOnKind(field.Elem().Kind(), field.Elem(), fieldData, ffpTag)
}
case reflect.Array:
for i := 0; i < field.Len(); i++ {
//fmt.Println("sl element interface", field.Index(i))
lowerBound := i * ffpTag.length
upperBound := lowerBound + ffpTag.length
assignBasedOnKind(field.Type().Elem().Kind(), field.Index(i), fieldData[lowerBound:upperBound], ffpTag)
}
case reflect.Slice:
if ffpTag.occurs < 1 {
err = errors.Errorf("flatfile.assignBasedOnKind: Occurs clause must be provided when using slice. `flatfile:\"col,len,occurs\"`")
}
//make slice of length ffpTag.occurs to avoid index out of range err
field.Set(reflect.MakeSlice(field.Type(), ffpTag.occurs, ffpTag.occurs))
for i := 0; i < ffpTag.occurs; i++ {
//fmt.Println("sl element interface", field.Index(i))
lowerBound := i * ffpTag.length
upperBound := lowerBound + ffpTag.length
assignBasedOnKind(field.Type().Elem().Kind(), field.Index(i), fieldData[lowerBound:upperBound], ffpTag)
}
}
return errors.Wrap(err, "flatfile.assignBasedOnKind: AssignmentError")
}
func assignBool(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseBool(string(fieldData))
//fmt.Println(newFieldVal)
if err == nil {
field.Set(reflect.ValueOf(newFieldVal))
}
return errors.Wrap(err, "flatfile.assignBool error")
}
func assignUint(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
var dummy uint
//Determine bitness using Sizeof
//this will return 1 for 8-bit, 2 for 16-bit, 4 for 32-bit, 8 for 64-bit. Multiply the result to get bitsize and convert to int for Parsing
newFieldVal, err := strconv.ParseUint(string(fieldData), 10, int(unsafe.Sizeof(dummy)*8))
if err == nil {
field.Set(reflect.ValueOf(uint(newFieldVal)))
}
return errors.Wrapf(err, "flatfile.assignUint: Failed to assignUint %v ", field)
}
func assignUint8(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseUint(string(fieldData), 10, 8)
if err == nil {
field.Set(reflect.ValueOf(uint8(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignUint8 error")
}
func assignUint16(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseUint(string(fieldData), 10, 16)
if err == nil {
field.Set(reflect.ValueOf(uint16(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignUint16 error")
}
func assignUint32(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseUint(string(fieldData), 10, 32)
if err == nil {
field.Set(reflect.ValueOf(uint32(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignUint32 error")
}
func assignUint64(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseUint(string(fieldData), 10, 64)
if err == nil {
field.Set(reflect.ValueOf(newFieldVal))
}
return errors.Wrap(err, "flatfile.assignUint64 error")
}
func assignInt(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
var dummy int
//Determine bitness using Sizeof
//this will return 1 for 8-bit, 2 for 16-bit, 4 for 32-bit, 8 for 64-bit. Multiply the result to get bitsize and convert to int for Parsing
newFieldVal, err := strconv.ParseInt(string(fieldData), 10, int(unsafe.Sizeof(dummy)*8))
if err == nil {
field.Set(reflect.ValueOf(int(newFieldVal)))
}
return errors.Wrapf(err, "flatfile.assignInt: Failed to assignInt %v ", field)
}
func assignInt8(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseInt(string(fieldData), 10, 8)
if err == nil {
field.Set(reflect.ValueOf(int8(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignInt8 error")
}
func assignInt16(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseInt(string(fieldData), 10, 16)
if err == nil {
field.Set(reflect.ValueOf(int16(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignInt16 error")
}
func assignInt32(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseInt(string(fieldData), 10, 32)
if err == nil {
field.Set(reflect.ValueOf(int32(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignInt32 error")
}
func assignInt64(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseInt(string(fieldData), 10, 64)
if err == nil {
field.Set(reflect.ValueOf(int64(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignInt64 error")
}
func assignFloat32(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseFloat(string(fieldData), 32)
if err == nil {
field.Set(reflect.ValueOf(float32(newFieldVal)))
}
return errors.Wrap(err, "flatfile.assignFloat32 error")
}
func assignFloat64(kind reflect.Kind, field reflect.Value, fieldData []byte) error {
newFieldVal, err := strconv.ParseFloat(string(fieldData), 64)
if err == nil {
field.Set(reflect.ValueOf(newFieldVal))
}
return errors.Wrap(err, "flatfile.assignFloat64 error")
}
func assignByte(field reflect.Value, fieldData byte) error {
field.Set(reflect.ValueOf(fieldData))
return nil
}
func assignRune(field reflect.Value, fieldData []byte) error {
newFieldVal, _ := utf8.DecodeRune(fieldData)
if newFieldVal == utf8.RuneError {
return errors.New("flatfile.assignRune error")
}
field.Set(reflect.ValueOf(newFieldVal))
return nil
}