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slice.go
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slice.go
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package utils
import (
"fmt"
"reflect"
)
var Stop = fmt.Errorf("stop iterating")
var EachChanMaxItems = 1048576
type IterationFunc func(i int, value interface{}) error
// Iterate through each element of the given array, slice or channel; calling
// iterFn exactly once for each element. Otherwise, call iterFn one time
// with the given input as the argument.
//
func SliceEach(slice interface{}, iterFn IterationFunc, preserve ...reflect.Kind) error {
if iterFn == nil {
return nil
}
slice = ResolveValue(slice)
if inT := reflect.TypeOf(slice); inT != nil {
switch inT.Kind() {
case reflect.Slice, reflect.Array:
sliceV := reflect.ValueOf(slice)
for i := 0; i < sliceV.Len(); i++ {
if err := iterFn(i, sliceV.Index(i).Interface()); err != nil {
if err == Stop {
return nil
} else {
return err
}
}
}
case reflect.Map:
for _, p := range preserve {
if p == reflect.Map {
if err := iterFn(0, slice); err != nil {
if err == Stop {
return nil
} else {
return err
}
} else {
return nil
}
}
}
mapV := reflect.ValueOf(slice)
for i, key := range mapV.MapKeys() {
if valueV := mapV.MapIndex(key); valueV.IsValid() && valueV.CanInterface() {
if err := iterFn(i, valueV.Interface()); err != nil {
if err == Stop {
return nil
} else {
return err
}
}
}
}
case reflect.Struct:
for _, p := range preserve {
if p == reflect.Struct {
if err := iterFn(0, slice); err != nil {
if err == Stop {
return nil
} else {
return err
}
} else {
return nil
}
}
}
structV := reflect.ValueOf(slice)
for i := 0; i < structV.Type().NumField(); i++ {
field := structV.Type().Field(i)
if field.Name != `` {
if valueV := structV.Field(i); valueV.IsValid() && valueV.CanInterface() {
if err := iterFn(i, valueV.Interface()); err != nil {
if err == Stop {
return nil
} else {
return err
}
}
}
}
}
case reflect.Chan:
sliceC := reflect.ValueOf(slice)
var i int
for {
if item, ok := sliceC.Recv(); ok {
if item.IsValid() && item.CanInterface() {
if err := iterFn(i, item.Interface()); err != nil {
if err == Stop {
return nil
} else {
return err
}
} else {
i++
}
}
} else if i >= EachChanMaxItems {
break
} else {
break
}
}
default:
if err := iterFn(0, slice); err != nil {
if err == Stop {
return nil
} else {
return err
}
}
}
}
return nil
}
// Takes some input value and returns it as a slice.
func Sliceify(in interface{}) []interface{} {
if in == nil {
return nil
}
var out = make([]interface{}, 0)
SliceEach(in, func(_ int, v interface{}) error {
out = append(out, v)
return nil
})
return out
}