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1 | <?php |
2 | |
3 | namespace pvc\html\dom; |
4 | |
5 | use pvc\interfaces\html\dom\DomNodeInterface; |
6 | use pvc\interfaces\struct\treesearch\VisitStatus; |
7 | use pvc\struct\treesearch\Direction; |
8 | use pvc\struct\treesearch\SearchDepthFirstPreorder; |
9 | |
10 | /** |
11 | * @extends SearchDepthFirstPreorder<DomNodeInterface> |
12 | */ |
13 | class DomRenderSearch extends SearchDepthFirstPreorder |
14 | { |
15 | /** |
16 | * getMovementDirection |
17 | * |
18 | * @return Direction |
19 | * |
20 | * returns MOVE_DOWN if we should keep iterating by recursing down through child nodes, |
21 | * returns STOP if we should stop moving through nodes |
22 | * returns MOVE_UP if we should continue moving by returning up to the parent |
23 | * |
24 | * the goal is to stop the first time we visit a node (status is never visited), and the |
25 | * last time we visit a node (status to be set top fully visited) |
26 | * |
27 | * This method also changes the visit status of the current node. |
28 | * |
29 | * if node never visited, we go to partially visited and stop. |
30 | * |
31 | * if a node is partially visited and not all the children are fully visited then we move down |
32 | * |
33 | * if node partially visited and if all the children are fully visited, we go to fully visited and stop. |
34 | * |
35 | * if node is fully visited we move up |
36 | * |
37 | */ |
38 | protected function getMovementDirection(): Direction |
39 | { |
40 | assert(!is_null($this->current())); |
41 | |
42 | switch ($this->current()->getVisitStatus()) { |
43 | /** |
44 | * stop when we first encounter a node. There's an initialization condition to |
45 | * account for: rewind is called in the first iteration and next for all subsequent iterations. |
46 | * Because current has been called before next the first time around, the start node has already been |
47 | * returned, so we do not want to return it again. |
48 | */ |
49 | case VisitStatus::NEVER_VISITED: |
50 | $this->current()->setVisitStatus( |
51 | VisitStatus::PARTIALLY_VISITED |
52 | ); |
53 | $direction = ($this->current() == $this->getStartNode()) |
54 | ? Direction::MOVE_DOWN : Direction::DONT_MOVE; |
55 | break; |
56 | |
57 | /** |
58 | * if all the children are fully visited, or we are at the max search level, then we move to fully visited |
59 | * otherwise we move down. The default case should never be true, which is to say that we should never |
60 | * be moving into a node that is fully visited. The default case is only there to satisfy the type checker |
61 | * that the $direction variable will have a value in all cases. |
62 | */ |
63 | case VisitStatus::PARTIALLY_VISITED: |
64 | if ($this->allChildrenFullyVisited() || $this->atMaxLevels()) { |
65 | $this->current()->setVisitStatus( |
66 | VisitStatus::FULLY_VISITED |
67 | ); |
68 | /** |
69 | * stop if this is the last time we will visit this node |
70 | */ |
71 | $direction = Direction::DONT_MOVE; |
72 | } else { |
73 | $direction = Direction::MOVE_DOWN; |
74 | } |
75 | break; |
76 | |
77 | case VisitStatus::FULLY_VISITED: |
78 | default: |
79 | $direction = Direction::MOVE_UP; |
80 | break; |
81 | } |
82 | return $direction; |
83 | } |
84 | } |