Code Coverage |
||||||||||
Lines |
Functions and Methods |
Classes and Traits |
||||||||
| Total | |
0.00% |
0 / 21 |
|
0.00% |
0 / 1 |
CRAP | |
0.00% |
0 / 1 |
| DomRenderSearch | |
0.00% |
0 / 21 |
|
0.00% |
0 / 1 |
72 | |
0.00% |
0 / 1 |
| getMovementDirection | |
0.00% |
0 / 21 |
|
0.00% |
0 / 1 |
72 | |||
| 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 | } |