Method Select

query.go:616–669

(t iterator)

}

func (p *precedingQuery) Select(t iterator) NodeNavigator {
	for {
		if p.iterator == nil {
			p.posit = 0
			node := p.Input.Select(t)
			if node == nil {
				return nil
			}
			node = node.Copy()
			if p.Sibling {
				p.iterator = func() NodeNavigator {
					for {
						for !node.MoveToPrevious() {
							return nil
						}
						if p.Predicate(node) {
							p.posit++
							return node
						}
					}
				}
			} else {
				var q query
				p.iterator = func() NodeNavigator {
					for {
						if q == nil {
							for !node.MoveToPrevious() {
								if !node.MoveToParent() {
									return nil
								}
								p.posit = 0
							}
							q = &descendantQuery{
								Self:      true,
								Input:     &contextQuery{},
								Predicate: p.Predicate,
							}
							t.Current().MoveTo(node)
						}
						if node := q.Select(t); node != nil {
							p.posit++
							return node
						}
						q = nil
					}
				}
			}
		}
		if node := p.iterator(); node != nil {
			return node
		}
		p.iterator = nil
	}
}

func (p *precedingQuery) Evaluate(t iterator) interface{} {
	p.Input.Evaluate(t)