ilAssLacCompositeBuilder.php

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<?php

class ilAssLacCompositeBuilder {

        protected $operators = array('<=','<','=','>=','>','<>','&','|');

        public function __construct()
        {
                include_once 'Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/Factory/ilAssLacOperationManufacturer.php';
                include_once 'Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/Factory/ilAssLacExpressionManufacturer.php';
        }

        public function create($nodes)
        {
                if($nodes['type'] == 'group')
                {
                        foreach($nodes['nodes'] as $key => $child)
                        {
                                $nodes['nodes'][$key] = $this->create($child);
                        }

                        foreach($this->operators as $next_operator)
                        {
                                do{
                                        $index = -1;
                                        for($i = 0; $i < count($nodes['nodes']); $i++)
                                        {
                                                if(!is_object($nodes['nodes'][$i]) && $nodes['nodes'][$i]['type'] == 'operator' && $nodes['nodes'][$i]['value'] == $next_operator)
                                                {
                                                        $index = $i;
                                                        break;
                                                }
                                        }
                                        if($index >= 0)
                                        {
                                                $operation_manufacture = ilAssLacOperationManufacturer::_getInstance();
                                                $operator = $operation_manufacture->manufacture($nodes['nodes'][$index]['value']);

                                                $operator->setNegated($nodes["negated"]);
                                                $operator->addNode($this->getExpression($nodes, $index-1));
                                                $operator->addNode($this->getExpression($nodes, $index+1));

                                                $new_nodes = array_slice($nodes['nodes'], 0, $index - 1);
                                                $new_nodes[] = $operator;
                                                $nodes['nodes'] = array_merge($new_nodes, array_slice($nodes['nodes'], $index + 2));
                                        }
                                }while($index >= 0);
                        }
                        return $nodes['nodes'][0];
                }
                return $nodes;
        }

        private function getExpression(array $node, $index)
        {
                $manufacturer = ilAssLacExpressionManufacturer::_getInstance();

                $expression = $node['nodes'][$index];
                if(!($expression instanceof ilAssLacAbstractComposite))
                {
                        $expression = $manufacturer->manufacture($node['nodes'][$index]['value']);
                }
                return $expression;
        }
}