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<?php |
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namespace dokuwiki\plugin\prosemirror\schema; |
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class NodeStack |
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{ |
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/** @var Node[] */ |
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protected $stack = []; |
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/** @var int index to the top of the stack */ |
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protected $stacklength = -1; |
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/** @var Node the root node */ |
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protected $doc; |
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/** |
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* NodeStack constructor. |
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*/ |
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public function __construct() |
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{ |
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$node = new Node('doc'); |
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$this->doc = $node; |
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$this->top($node); |
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} |
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/** |
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* @return Node |
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*/ |
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public function getDocNode() |
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{ |
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return $this->stack[0]; |
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} |
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/** |
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* Get the current node (the one at the top of the stack) |
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* |
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* @return Node |
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*/ |
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public function current() |
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{ |
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return $this->stack[$this->stacklength]; |
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} |
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/** |
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* Get the document (top most level) node |
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* |
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* @return Node |
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*/ |
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public function doc() |
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{ |
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return $this->doc; |
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} |
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/** |
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* Make the given node the current one |
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* |
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* @param Node $node |
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*/ |
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protected function top(Node $node) |
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{ |
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$this->stack[] = $node; |
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$this->stacklength++; |
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} |
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/** |
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* Add a new child node to the current node and make it the new current node |
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* |
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* @param Node $node |
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*/ |
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public function addTop(Node $node) |
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{ |
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$this->add($node); |
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$this->top($node); |
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} |
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/** |
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* Pop the current node off the stack |
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* |
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* @param string $type The type of node that is expected. A RuntimeException is thrown if the current nod does not |
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* match |
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* |
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* @return Node |
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*/ |
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public function drop($type) |
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{ |
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/** @var Node $node */ |
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$node = array_pop($this->stack); |
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$this->stacklength--; |
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if ($node->getType() != $type) { |
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throw new \RuntimeException( |
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"Expected the current node to be of type $type found " . $node->getType() . " instead." |
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); |
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} |
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return $node; |
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} |
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/** |
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* Add a new child node to the current node |
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* |
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* @param Node $node |
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*/ |
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public function add(Node $node) |
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{ |
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$this->current()->addChild($node); |
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} |
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/** |
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* Check if there have been any nodes added to the document |
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*/ |
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public function isEmpty() |
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{ |
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return !$this->doc->hasContent(); |
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} |
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} |
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cosmocode /
dokuwiki-plugin-prosemirror
