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// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
package cast
import (
"encoding/json"
"fmt"
"reflect"
)
func toMapE[K comparable, V any](i any, keyFn func(any) K, valFn func(any) V) (map[K]V, error) {
m := map[K]V{}
if i == nil {
return m, fmt.Errorf(errorMsg, i, i, m)
}
switch v := i.(type) {
case map[K]V:
return v, nil
case map[K]any:
for k, val := range v {
m[k] = valFn(val)
}
return m, nil
case map[any]V:
for k, val := range v {
m[keyFn(k)] = val
}
return m, nil
case map[any]any:
for k, val := range v {
m[keyFn(k)] = valFn(val)
}
return m, nil
case string:
err := jsonStringToObject(v, &m)
return m, err
default:
return m, fmt.Errorf(errorMsg, i, i, m)
}
}
func toStringMapE[T any](i any, fn func(any) T) (map[string]T, error) {
return toMapE(i, ToString, fn)
}
// ToStringMapStringE casts any value to a map[string]string type.
func ToStringMapStringE(i any) (map[string]string, error) {
return toStringMapE(i, ToString)
}
// ToStringMapStringSliceE casts any value to a map[string][]string type.
func ToStringMapStringSliceE(i any) (map[string][]string, error) {
m := map[string][]string{}
switch v := i.(type) {
case map[string][]string:
return v, nil
case map[string][]any:
for k, val := range v {
m[ToString(k)] = ToStringSlice(val)
}
return m, nil
case map[string]string:
for k, val := range v {
m[ToString(k)] = []string{val}
}
case map[string]any:
for k, val := range v {
switch vt := val.(type) {
case []any:
m[ToString(k)] = ToStringSlice(vt)
case []string:
m[ToString(k)] = vt
default:
m[ToString(k)] = []string{ToString(val)}
}
}
return m, nil
case map[any][]string:
for k, val := range v {
m[ToString(k)] = ToStringSlice(val)
}
return m, nil
case map[any]string:
for k, val := range v {
m[ToString(k)] = ToStringSlice(val)
}
return m, nil
case map[any][]any:
for k, val := range v {
m[ToString(k)] = ToStringSlice(val)
}
return m, nil
case map[any]any:
for k, val := range v {
key, err := ToStringE(k)
if err != nil {
return m, fmt.Errorf(errorMsg, i, i, m)
}
value, err := ToStringSliceE(val)
if err != nil {
return m, fmt.Errorf(errorMsg, i, i, m)
}
m[key] = value
}
case string:
err := jsonStringToObject(v, &m)
return m, err
default:
return m, fmt.Errorf(errorMsg, i, i, m)
}
return m, nil
}
// ToStringMapBoolE casts any value to a map[string]bool type.
func ToStringMapBoolE(i any) (map[string]bool, error) {
return toStringMapE(i, ToBool)
}
// ToStringMapE casts any value to a map[string]any type.
func ToStringMapE(i any) (map[string]any, error) {
fn := func(i any) any { return i }
return toStringMapE(i, fn)
}
func toStringMapIntE[T int | int64](i any, fn func(any) T, fnE func(any) (T, error)) (map[string]T, error) {
m := map[string]T{}
if i == nil {
return nil, fmt.Errorf(errorMsg, i, i, m)
}
switch v := i.(type) {
case map[string]T:
return v, nil
case map[string]any:
for k, val := range v {
m[k] = fn(val)
}
return m, nil
case map[any]T:
for k, val := range v {
m[ToString(k)] = val
}
return m, nil
case map[any]any:
for k, val := range v {
m[ToString(k)] = fn(val)
}
return m, nil
case string:
err := jsonStringToObject(v, &m)
return m, err
}
if reflect.TypeOf(i).Kind() != reflect.Map {
return m, fmt.Errorf(errorMsg, i, i, m)
}
mVal := reflect.ValueOf(m)
v := reflect.ValueOf(i)
for _, keyVal := range v.MapKeys() {
val, err := fnE(v.MapIndex(keyVal).Interface())
if err != nil {
return m, fmt.Errorf(errorMsg, i, i, m)
}
mVal.SetMapIndex(keyVal, reflect.ValueOf(val))
}
return m, nil
}
// ToStringMapIntE casts any value to a map[string]int type.
func ToStringMapIntE(i any) (map[string]int, error) {
return toStringMapIntE(i, ToInt, ToIntE)
}
// ToStringMapInt64E casts any value to a map[string]int64 type.
func ToStringMapInt64E(i any) (map[string]int64, error) {
return toStringMapIntE(i, ToInt64, ToInt64E)
}
// jsonStringToObject attempts to unmarshall a string as JSON into
// the object passed as pointer.
func jsonStringToObject(s string, v any) error {
data := []byte(s)
return json.Unmarshal(data, v)
}
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