Method Select

query.go:1322–1352

(t iterator)

}

func (m *mergeQuery) Select(t iterator) NodeNavigator {
	for {
		if m.iterator == nil {
			root := m.Input.Select(t)
			if root == nil {
				return nil
			}
			m.Child.Evaluate(t)
			root = root.Copy()
			t.Current().MoveTo(root)
			var list []NodeNavigator
			for node := m.Child.Select(t); node != nil; node = m.Child.Select(t) {
				list = append(list, node.Copy())
			}
			i := 0
			m.iterator = func() NodeNavigator {
				if i >= len(list) {
					return nil
				}
				result := list[i]
				i++
				return result
			}
		}

		if node := m.iterator(); node != nil {
			return node
		}
		m.iterator = nil
	}
}

func (m *mergeQuery) Evaluate(t iterator) interface{} {
	m.Input.Evaluate(t)