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types.go
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types.go
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package gocsv
import (
"encoding"
"fmt"
"reflect"
"strconv"
"strings"
)
// --------------------------------------------------------------------------
// Conversion interfaces
// TypeMarshaller is implemented by any value that has a MarshalCSV method
// This converter is used to convert the value to it string representation
type TypeMarshaller interface {
MarshalCSV() (string, error)
}
// Stringer is implemented by any value that has a String method
// This converter is used to convert the value to it string representation
// This converter will be used if your value does not implement TypeMarshaller
type Stringer interface {
String() string
}
// TypeUnmarshaller is implemented by any value that has an UnmarshalCSV method
// This converter is used to convert a string to your value representation of that string
type TypeUnmarshaller interface {
UnmarshalCSV(string) error
}
// NoUnmarshalFuncError is the custom error type to be raised in case there is no unmarshal function defined on type
type NoUnmarshalFuncError struct {
msg string
}
func (e NoUnmarshalFuncError) Error() string {
return e.msg
}
// NoMarshalFuncError is the custom error type to be raised in case there is no marshal function defined on type
type NoMarshalFuncError struct {
msg string
}
func (e NoMarshalFuncError) Error() string {
return e.msg
}
var (
stringerType = reflect.TypeOf((*Stringer)(nil)).Elem()
marshallerType = reflect.TypeOf((*TypeMarshaller)(nil)).Elem()
unMarshallerType = reflect.TypeOf((*TypeUnmarshaller)(nil)).Elem()
textMarshalerType = reflect.TypeOf((*encoding.TextMarshaler)(nil)).Elem()
textUnMarshalerType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
)
// --------------------------------------------------------------------------
// Conversion helpers
func toString(in interface{}) (string, error) {
inValue := reflect.ValueOf(in)
switch inValue.Kind() {
case reflect.String:
return inValue.String(), nil
case reflect.Bool:
b := inValue.Bool()
if b {
return "true", nil
}
return "false", nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return fmt.Sprintf("%v", inValue.Int()), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return fmt.Sprintf("%v", inValue.Uint()), nil
case reflect.Float32:
return strconv.FormatFloat(inValue.Float(), byte('f'), -1, 32), nil
case reflect.Float64:
return strconv.FormatFloat(inValue.Float(), byte('f'), -1, 64), nil
}
return "", fmt.Errorf("No known conversion from " + inValue.Type().String() + " to string")
}
func toBool(in interface{}) (bool, error) {
inValue := reflect.ValueOf(in)
switch inValue.Kind() {
case reflect.String:
s := inValue.String()
switch s {
case "yes":
return true, nil
case "no", "":
return false, nil
default:
return strconv.ParseBool(s)
}
case reflect.Bool:
return inValue.Bool(), nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
i := inValue.Int()
if i != 0 {
return true, nil
}
return false, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
i := inValue.Uint()
if i != 0 {
return true, nil
}
return false, nil
case reflect.Float32, reflect.Float64:
f := inValue.Float()
if f != 0 {
return true, nil
}
return false, nil
}
return false, fmt.Errorf("No known conversion from " + inValue.Type().String() + " to bool")
}
func toInt(in interface{}) (int64, error) {
inValue := reflect.ValueOf(in)
switch inValue.Kind() {
case reflect.String:
s := strings.TrimSpace(inValue.String())
if s == "" {
return 0, nil
}
return strconv.ParseInt(s, 0, 64)
case reflect.Bool:
if inValue.Bool() {
return 1, nil
}
return 0, nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return inValue.Int(), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return int64(inValue.Uint()), nil
case reflect.Float32, reflect.Float64:
return int64(inValue.Float()), nil
}
return 0, fmt.Errorf("No known conversion from " + inValue.Type().String() + " to int")
}
func toUint(in interface{}) (uint64, error) {
inValue := reflect.ValueOf(in)
switch inValue.Kind() {
case reflect.String:
s := strings.TrimSpace(inValue.String())
if s == "" {
return 0, nil
}
// support the float input
if strings.Contains(s, ".") {
f, err := strconv.ParseFloat(s, 64)
if err != nil {
return 0, err
}
return uint64(f), nil
}
return strconv.ParseUint(s, 0, 64)
case reflect.Bool:
if inValue.Bool() {
return 1, nil
}
return 0, nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return uint64(inValue.Int()), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return inValue.Uint(), nil
case reflect.Float32, reflect.Float64:
return uint64(inValue.Float()), nil
}
return 0, fmt.Errorf("No known conversion from " + inValue.Type().String() + " to uint")
}
func toFloat(in interface{}) (float64, error) {
inValue := reflect.ValueOf(in)
switch inValue.Kind() {
case reflect.String:
s := strings.TrimSpace(inValue.String())
if s == "" {
return 0, nil
}
return strconv.ParseFloat(s, 64)
case reflect.Bool:
if inValue.Bool() {
return 1, nil
}
return 0, nil
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return float64(inValue.Int()), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return float64(inValue.Uint()), nil
case reflect.Float32, reflect.Float64:
return inValue.Float(), nil
}
return 0, fmt.Errorf("No known conversion from " + inValue.Type().String() + " to float")
}
func setField(field reflect.Value, value string, omitEmpty bool) error {
if field.Kind() == reflect.Ptr {
if omitEmpty && value == "" {
return nil
}
if field.IsNil() {
field.Set(reflect.New(field.Type().Elem()))
}
field = field.Elem()
}
switch field.Interface().(type) {
case string:
s, err := toString(value)
if err != nil {
return err
}
field.SetString(s)
case bool:
b, err := toBool(value)
if err != nil {
return err
}
field.SetBool(b)
case int, int8, int16, int32, int64:
i, err := toInt(value)
if err != nil {
return err
}
field.SetInt(i)
case uint, uint8, uint16, uint32, uint64:
ui, err := toUint(value)
if err != nil {
return err
}
field.SetUint(ui)
case float32, float64:
f, err := toFloat(value)
if err != nil {
return err
}
field.SetFloat(f)
default:
// Not a native type, check for unmarshal method
if err := unmarshall(field, value); err != nil {
if _, ok := err.(NoUnmarshalFuncError); !ok {
return err
}
// Could not unmarshal, check for kind, e.g. renamed type from basic type
switch field.Kind() {
case reflect.String:
s, err := toString(value)
if err != nil {
return err
}
field.SetString(s)
case reflect.Bool:
b, err := toBool(value)
if err != nil {
return err
}
field.SetBool(b)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
i, err := toInt(value)
if err != nil {
return err
}
field.SetInt(i)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
ui, err := toUint(value)
if err != nil {
return err
}
field.SetUint(ui)
case reflect.Float32, reflect.Float64:
f, err := toFloat(value)
if err != nil {
return err
}
field.SetFloat(f)
default:
return err
}
} else {
return nil
}
}
return nil
}
func getFieldAsString(field reflect.Value) (str string, err error) {
switch field.Kind() {
case reflect.Interface:
case reflect.Ptr:
if field.IsNil() {
return "", nil
}
return getFieldAsString(field.Elem())
default:
// Check if field is go native type
switch field.Interface().(type) {
case string:
return field.String(), nil
case bool:
str, err = toString(field.Bool())
if err != nil {
return str, err
}
case int, int8, int16, int32, int64:
str, err = toString(field.Int())
if err != nil {
return str, err
}
case uint, uint8, uint16, uint32, uint64:
str, err = toString(field.Uint())
if err != nil {
return str, err
}
case float32:
str, err = toString(float32(field.Float()))
if err != nil {
return str, err
}
case float64:
str, err = toString(field.Float())
if err != nil {
return str, err
}
default:
// Not a native type, check for marshal method
str, err = marshall(field)
if err != nil {
if _, ok := err.(NoMarshalFuncError); !ok {
return str, err
}
// If not marshal method, is field compatible with/renamed from native type
switch field.Kind() {
case reflect.String:
return field.String(), nil
case reflect.Bool:
str, err = toString(field.Bool())
if err != nil {
return str, err
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
str, err = toString(field.Int())
if err != nil {
return str, err
}
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
str, err = toString(field.Uint())
if err != nil {
return str, err
}
case reflect.Float32:
str, err = toString(float32(field.Float()))
if err != nil {
return str, err
}
case reflect.Float64:
str, err = toString(field.Float())
if err != nil {
return str, err
}
}
} else {
return str, nil
}
}
}
return str, nil
}
// --------------------------------------------------------------------------
// Un/serializations helpers
func unmarshall(field reflect.Value, value string) error {
dupField := field
unMarshallIt := func(finalField reflect.Value) error {
if finalField.CanInterface() {
fieldIface := finalField.Interface()
fieldTypeUnmarshaller, ok := fieldIface.(TypeUnmarshaller)
if ok {
return fieldTypeUnmarshaller.UnmarshalCSV(value)
}
// Otherwise try to use TextUnmarshaler
fieldTextUnmarshaler, ok := fieldIface.(encoding.TextUnmarshaler)
if ok {
return fieldTextUnmarshaler.UnmarshalText([]byte(value))
}
}
return NoUnmarshalFuncError{"No known conversion from string to " + field.Type().String() + ", " + field.Type().String() + " does not implement TypeUnmarshaller"}
}
for dupField.Kind() == reflect.Interface || dupField.Kind() == reflect.Ptr {
if dupField.IsNil() {
dupField = reflect.New(field.Type().Elem())
field.Set(dupField)
return unMarshallIt(dupField)
}
dupField = dupField.Elem()
}
if dupField.CanAddr() {
return unMarshallIt(dupField.Addr())
}
return NoUnmarshalFuncError{"No known conversion from string to " + field.Type().String() + ", " + field.Type().String() + " does not implement TypeUnmarshaller"}
}
func marshall(field reflect.Value) (value string, err error) {
dupField := field
marshallIt := func(finalField reflect.Value) (string, error) {
if finalField.CanInterface() {
fieldIface := finalField.Interface()
// Use TypeMarshaller when possible
fieldTypeMarhaller, ok := fieldIface.(TypeMarshaller)
if ok {
return fieldTypeMarhaller.MarshalCSV()
}
// Otherwise try to use TextMarshaller
fieldTextMarshaler, ok := fieldIface.(encoding.TextMarshaler)
if ok {
text, err := fieldTextMarshaler.MarshalText()
return string(text), err
}
// Otherwise try to use Stringer
fieldStringer, ok := fieldIface.(Stringer)
if ok {
return fieldStringer.String(), nil
}
}
return value, NoMarshalFuncError{"No known conversion from " + field.Type().String() + " to string, " + field.Type().String() + " does not implement TypeMarshaller nor Stringer"}
}
for dupField.Kind() == reflect.Interface || dupField.Kind() == reflect.Ptr {
if dupField.IsNil() {
return value, nil
}
dupField = dupField.Elem()
}
if dupField.CanAddr() {
return marshallIt(dupField.Addr())
}
return value, NoMarshalFuncError{"No known conversion from " + field.Type().String() + " to string, " + field.Type().String() + " does not implement TypeMarshaller nor Stringer"}
}