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marshaler.go
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marshaler.go
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package mapping
import (
"fmt"
"reflect"
"strings"
)
const (
emptyTag = ""
tagKVSeparator = ":"
)
// Marshal marshals the given val and returns the map that contains the fields.
// optional=another is not implemented, and it's hard to implement and not common used.
func Marshal(val any) (map[string]map[string]any, error) {
ret := make(map[string]map[string]any)
tp := reflect.TypeOf(val)
if tp.Kind() == reflect.Ptr {
tp = tp.Elem()
}
rv := reflect.ValueOf(val)
if rv.Kind() == reflect.Ptr {
rv = rv.Elem()
}
for i := 0; i < tp.NumField(); i++ {
field := tp.Field(i)
value := rv.Field(i)
if err := processMember(field, value, ret); err != nil {
return nil, err
}
}
return ret, nil
}
func getTag(field reflect.StructField) (string, bool) {
tag := string(field.Tag)
if i := strings.Index(tag, tagKVSeparator); i >= 0 {
return strings.TrimSpace(tag[:i]), true
}
return strings.TrimSpace(tag), false
}
func processMember(field reflect.StructField, value reflect.Value,
collector map[string]map[string]any) error {
var key string
var opt *fieldOptions
var err error
tag, ok := getTag(field)
if !ok {
tag = emptyTag
key = field.Name
} else {
key, opt, err = parseKeyAndOptions(tag, field)
if err != nil {
return err
}
if err = validate(field, value, opt); err != nil {
return err
}
}
val := value.Interface()
if opt != nil && opt.FromString {
val = fmt.Sprint(val)
}
m, ok := collector[tag]
if ok {
m[key] = val
} else {
m = map[string]any{
key: val,
}
}
collector[tag] = m
return nil
}
func validate(field reflect.StructField, value reflect.Value, opt *fieldOptions) error {
if opt == nil || !opt.Optional {
if err := validateOptional(field, value); err != nil {
return err
}
}
if opt == nil {
return nil
}
if opt.Optional && value.IsZero() {
return nil
}
if len(opt.Options) > 0 {
if err := validateOptions(value, opt); err != nil {
return err
}
}
if opt.Range != nil {
if err := validateRange(value, opt); err != nil {
return err
}
}
return nil
}
func validateOptional(field reflect.StructField, value reflect.Value) error {
switch field.Type.Kind() {
case reflect.Ptr:
if value.IsNil() {
return fmt.Errorf("field %q is nil", field.Name)
}
case reflect.Array, reflect.Slice, reflect.Map:
if value.IsNil() || value.Len() == 0 {
return fmt.Errorf("field %q is empty", field.Name)
}
}
return nil
}
func validateOptions(value reflect.Value, opt *fieldOptions) error {
var found bool
val := fmt.Sprint(value.Interface())
for i := range opt.Options {
if opt.Options[i] == val {
found = true
break
}
}
if !found {
return fmt.Errorf("field %q not in options", val)
}
return nil
}
func validateRange(value reflect.Value, opt *fieldOptions) error {
var val float64
switch v := value.Interface().(type) {
case int:
val = float64(v)
case int8:
val = float64(v)
case int16:
val = float64(v)
case int32:
val = float64(v)
case int64:
val = float64(v)
case uint:
val = float64(v)
case uint8:
val = float64(v)
case uint16:
val = float64(v)
case uint32:
val = float64(v)
case uint64:
val = float64(v)
case float32:
val = float64(v)
case float64:
val = v
default:
return fmt.Errorf("unknown support type for range %q", value.Type().String())
}
// validates [left, right], [left, right), (left, right], (left, right)
if val < opt.Range.left ||
(!opt.Range.leftInclude && val == opt.Range.left) ||
val > opt.Range.right ||
(!opt.Range.rightInclude && val == opt.Range.right) {
return fmt.Errorf("%v out of range", value.Interface())
}
return nil
}