form_mapping.go

package binding

import (
	"errors"
	"reflect"
	"strconv"
)

func mapForm(ptr interface{}, form map[string][]string) error {
	typ := reflect.TypeOf(ptr).Elem()
	val := reflect.ValueOf(ptr).Elem()
	for i := 0; i < typ.NumField(); i++ {
		typeField := typ.Field(i)
		structField := val.Field(i)
		if !structField.CanSet() {
			continue
		}

		structFieldKind := structField.Kind()
		inputFieldName := typeField.Tag.Get("form")
		if inputFieldName == "" {
			inputFieldName = typeField.Name

			// if "form" tag is nil, we inspect if the field is a struct.
			// this would not make sense for JSON parsing but it does for a form
			// since data is flatten
			if structFieldKind == reflect.Struct {
				err := mapForm(structField.Addr().Interface(), form)
				if err != nil {
					return err
				}
				continue
			}
		}
		inputValue, exists := form[inputFieldName]
		if !exists {
			continue
		}

		numElements := len(inputValue)
		if structFieldKind == reflect.Slice && numElements > 0 {
			sliceOf := structField.Type().Elem().Kind()
			slice := reflect.MakeSlice(structField.Type(), numElements, numElements)
			for i := 0; i < numElements; i++ {
				if err := setWithProperType(sliceOf, inputValue[i], slice.Index(i)); err != nil {
					return err
				}
			}
			val.Field(i).Set(slice)
		} else {
			if err := setWithProperType(typeField.Type.Kind(), inputValue[0], structField); err != nil {
				return err
			}
		}
	}
	return nil
}

func setWithProperType(valueKind reflect.Kind, val string, structField reflect.Value) error {
	switch valueKind {
	case reflect.Int:
		return setIntField(val, 0, structField)
	case reflect.Int8:
		return setIntField(val, 8, structField)
	case reflect.Int16:
		return setIntField(val, 16, structField)
	case reflect.Int32:
		return setIntField(val, 32, structField)
	case reflect.Int64:
		return setIntField(val, 64, structField)
	case reflect.Uint:
		return setUintField(val, 0, structField)
	case reflect.Uint8:
		return setUintField(val, 8, structField)
	case reflect.Uint16:
		return setUintField(val, 16, structField)
	case reflect.Uint32:
		return setUintField(val, 32, structField)
	case reflect.Uint64:
		return setUintField(val, 64, structField)
	case reflect.Bool:
		return setBoolField(val, structField)
	case reflect.Float32:
		return setFloatField(val, 32, structField)
	case reflect.Float64:
		return setFloatField(val, 64, structField)
	case reflect.String:
		structField.SetString(val)
	default:
		return errors.New("form mapping unknown type")
	}
	return nil
}

func setIntField(val string, bitSize int, field reflect.Value) error {
	if val == "" {
		val = "0"
	}
	intVal, err := strconv.ParseInt(val, 10, bitSize)
	if err == nil {
		field.SetInt(intVal)
	}
	return err
}

func setUintField(val string, bitSize int, field reflect.Value) error {
	if val == "" {
		val = "0"
	}
	uintVal, err := strconv.ParseUint(val, 10, bitSize)
	if err == nil {
		field.SetUint(uintVal)
	}
	return err
}

func setBoolField(val string, field reflect.Value) error {
	if val == "" {
		val = "false"
	}
	boolVal, err := strconv.ParseBool(val)
	if err == nil {
		field.SetBool(boolVal)
	}
	return nil
}

func setFloatField(val string, bitSize int, field reflect.Value) error {
	if val == "" {
		val = "0.0"
	}
	floatVal, err := strconv.ParseFloat(val, bitSize)
	if err == nil {
		field.SetFloat(floatVal)
	}
	return err
}