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package ethutil

import "reflect"

// The list type is an anonymous slice handler which can be used
// for containing any slice type to use in an environment which
// does not support slice types (e.g., JavaScript, QML)
type List struct {
    list   reflect.Value
    Length int
}

// Initialise a new list. Panics if non-slice type is given.
func NewList(t interface{}) *List {
    list := reflect.ValueOf(t)
    if list.Kind() != reflect.Slice {
        panic("list container initialized with a non-slice type")
    }

    return &List{list, list.Len()}
}

// Get N element from the embedded slice. Returns nil if OOB.
func (self *List) Get(i int) interface{} {
    if self.list.Len() > i {
        return self.list.Index(i).Interface()
    }

    return nil
}

// Appends value at the end of the slice. Panics when incompatible value
// is given.
func (self *List) Append(v interface{}) {
    self.list = reflect.Append(self.list, reflect.ValueOf(v))
    self.Length = self.list.Len()
}

// Returns the underlying slice as interface.
func (self *List) Interface() interface{} {
    return self.list.Interface()
}