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// +build js
package reflect
import "github.com/gopherjs/gopherjs/js"
func Swapper(slice interface{}) func(i, j int) {
v := ValueOf(slice)
if v.Kind() != Slice {
panic(&ValueError{Method: "Swapper", Kind: v.Kind()})
}
// Fast path for slices of size 0 and 1. Nothing to swap.
vLen := uint(v.Len())
switch vLen {
case 0:
return func(i, j int) { panic("reflect: slice index out of range") }
case 1:
return func(i, j int) {
if i != 0 || j != 0 {
panic("reflect: slice index out of range")
}
}
}
a := js.InternalObject(slice).Get("$array")
off := js.InternalObject(slice).Get("$offset").Int()
return func(i, j int) {
if uint(i) >= vLen || uint(j) >= vLen {
panic("reflect: slice index out of range")
}
i += off
j += off
tmp := a.Index(i)
a.SetIndex(i, a.Index(j))
a.SetIndex(j, tmp)
}
}
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