Method Select

query.go:437–484

(t iterator)

}

func (d *descendantQuery) Select(t iterator) NodeNavigator {
	for {
		if d.iterator == nil {
			d.posit = 0
			node := d.Input.Select(t)
			if node == nil {
				return nil
			}
			node = node.Copy()
			d.level = 0
			first := true
			d.iterator = func() NodeNavigator {
				if first {
					first = false
					if d.Self && d.Predicate(node) {
						return node
					}
				}

				for {
					if node.MoveToChild() {
						d.level = d.level + 1
					} else {
						for {
							if d.level == 0 {
								return nil
							}
							if node.MoveToNext() {
								break
							}
							node.MoveToParent()
							d.level = d.level - 1
						}
					}
					if d.Predicate(node) {
						return node
					}
				}
			}
		}

		if node := d.iterator(); node != nil {
			d.posit++
			return node
		}
		d.iterator = nil
	}
}

func (d *descendantQuery) Evaluate(t iterator) interface{} {
	d.Input.Evaluate(t)