go-ml-dev/dyl

package dyl

import (
    "reflect"
)

func Option(t interface{}, o interface{}) reflect.Value {
    xs := reflect.ValueOf(o)
    tv := reflect.ValueOf(t)
    for i := 0; i < xs.Len(); i++ {
        x := xs.Index(i)
        if x.Kind() == reflect.Interface {
            x = x.Elem()
        }
        if x.Type() == tv.Type() {
            return x
        }
    }
    return tv
}

func IfsOption(t interface{}, o []interface{}) interface{} {
    return Option(t, o).Interface()
}

func MultiOption(o []interface{}, t ...interface{}) (reflect.Value, int) {
    for _, x := range o {
        for i, tv := range t {
            v := reflect.ValueOf(x)
            if v.Type() == reflect.TypeOf(tv) {
                return v, i
            }
        }
    }
    return reflect.ValueOf(t[0]), 0
}

func StrMultiOption(o []interface{}, t ...interface{}) (string, int) {
    v, i := MultiOption(o, t...)
    return v.String(), i
}