Function ArrayIndex

gapis/resolve/resolve.go:153–183

ArrayIndex resolves and returns the array or slice element from the path p.

(ctx context.Context, p *path.ArrayIndex, r *path.ResolveConfig)

// ArrayIndex resolves and returns the array or slice element from the path p.
func ArrayIndex(ctx context.Context, p *path.ArrayIndex, r *path.ResolveConfig) (interface{}, error) {
	obj, err := ResolveInternal(ctx, p.Parent(), r)
	if err != nil {
		return nil, err
	}

	a := reflect.ValueOf(obj)
	switch {
	case box.IsMemorySlice(a.Type()):
		slice := box.AsMemorySlice(a)
		if count := slice.Count(); p.Index >= count {
			return nil, errPathOOB(p.Index, "Index", 0, count-1, p)
		}
		return slice.ISlice(p.Index, p.Index+1), nil

	default:
		switch a.Kind() {
		case reflect.Array, reflect.Slice, reflect.String:
			if count := uint64(a.Len()); p.Index >= count {
				return nil, errPathOOB(p.Index, "Index", 0, count-1, p)
			}
			return a.Index(int(p.Index)).Interface(), nil

		default:
			return nil, &service.ErrInvalidPath{
				Reason: messages.ErrTypeNotArrayIndexable(typename(a.Type())),
				Path:   p.Path(),
			}
		}
	}
}

// Slice resolves and returns the subslice from the path p.
func Slice(ctx context.Context, p *path.Slice, r *path.ResolveConfig) (interface{}, error) {