YTSFlix_Go/vendor/github.com/anacrolix/missinggo/slices/map.go

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2018-11-04 14:58:15 +00:00
package slices
import "reflect"
type MapItem struct {
Key, Elem interface{}
}
// Creates a []struct{Key K; Value V} for map[K]V.
func FromMap(m interface{}) (slice []MapItem) {
mapValue := reflect.ValueOf(m)
for _, key := range mapValue.MapKeys() {
slice = append(slice, MapItem{key.Interface(), mapValue.MapIndex(key).Interface()})
}
return
}
// Returns all the elements []T, from m where m is map[K]T.
func FromMapElems(m interface{}) interface{} {
inValue := reflect.ValueOf(m)
outValue := reflect.MakeSlice(reflect.SliceOf(inValue.Type().Elem()), inValue.Len(), inValue.Len())
for i, key := range inValue.MapKeys() {
outValue.Index(i).Set(inValue.MapIndex(key))
}
return outValue.Interface()
}
// Returns all the elements []K, from m where m is map[K]T.
func FromMapKeys(m interface{}) interface{} {
inValue := reflect.ValueOf(m)
outValue := reflect.MakeSlice(reflect.SliceOf(inValue.Type().Key()), inValue.Len(), inValue.Len())
for i, key := range inValue.MapKeys() {
outValue.Index(i).Set(key)
}
return outValue.Interface()
}
// f: (T)T, input: []T, outout: []T
func Map(f, input interface{}) interface{} {
inputValue := reflect.ValueOf(input)
funcValue := reflect.ValueOf(f)
_len := inputValue.Len()
retValue := reflect.MakeSlice(reflect.TypeOf(input), _len, _len)
for i := 0; i < _len; i++ {
out := funcValue.Call([]reflect.Value{inputValue.Index(i)})
retValue.Index(i).Set(out[0])
}
return retValue.Interface()
}