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// Licensed under the MIT license, see LICENSE file for details.
package qt
import (
"fmt"
"reflect"
)
// containerIter provides an interface for iterating over a container
// (map, slice or array).
type containerIter[T any] interface {
// next advances to the next item in the container.
next() bool
// key returns the current key as a string.
key() string
// value returns the current value.
value() T
}
func newSliceIter[T any](slice []T) *sliceIter[T] {
return &sliceIter[T]{
slice: slice,
index: -1,
}
}
// sliceIter implements containerIter for slices and arrays.
type sliceIter[T any] struct {
slice []T
index int
}
func (i *sliceIter[T]) next() bool {
i.index++
return i.index < len(i.slice)
}
func (i *sliceIter[T]) value() T {
return i.slice[i.index]
}
func (i *sliceIter[T]) key() string {
return fmt.Sprintf("index %d", i.index)
}
func newMapIter[K comparable, V any](m map[K]V) containerIter[V] {
return mapValueIter[V]{
iter: reflect.ValueOf(m).MapRange(),
}
}
// mapValueIter implements containerIter for maps.
type mapValueIter[T any] struct {
iter *reflect.MapIter
v T
}
func (i mapValueIter[T]) next() bool {
return i.iter.Next()
}
func (i mapValueIter[T]) key() string {
return fmt.Sprintf("key %#v", i.iter.Key())
}
func (i mapValueIter[T]) value() T {
return valueAs[T](i.iter.Value())
}
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