コード例 #1
0
ファイル: Transformer.php プロジェクト: helstern/nomsky-lib
 /**
  * @param Production $production
  * @return array|Production[]
  */
 public function transform(Production $production)
 {
     $expression = $production->getExpression();
     $visitor = new Visitor();
     $hierarchicVisitDispatcher = new CompleteVisitDispatcher($visitor);
     $walker = new DepthFirstStackBasedWalker();
     $walker->walk($expression, $hierarchicVisitDispatcher);
     $rootExpression = $visitor->getRoot();
     $production = new StandardProduction($production->getNonTerminal(), $rootExpression);
     return array($production);
 }
コード例 #2
0
 /**
  * @param Production $production
  * @return array|Production[]
  */
 public function transform(Production $production)
 {
     $expression = $production->getExpression();
     if ($expression instanceof Choice) {
         $productions = array();
         $expressions = iterator_to_array($expression->getIterator());
         foreach ($expressions as $expression) {
             $productions[] = new StandardProduction($production->getNonTerminal(), $expression);
         }
         return $productions;
     }
     return array($production);
 }
コード例 #3
0
ファイル: Transformer.php プロジェクト: helstern/nomsky-lib
 /**
  * @param Production $initialProduction
  * @return array|Production[]
  */
 public function transform(Production $initialProduction)
 {
     $expression = $initialProduction->getExpression();
     $visitor = new OptionalsEliminator($this->nonTerminalNamingStrategy);
     $hierarchicVisitDispatcher = new CompleteVisitDispatcher($visitor);
     $walker = new DepthFirstStackBasedWalker();
     $walker->walk($expression, $hierarchicVisitDispatcher);
     $visitRoot = $visitor->getRoot();
     $cleanedProduction = new StandardProduction($initialProduction->getNonTerminal(), $visitRoot);
     $cleanedProductionsList = array($cleanedProduction);
     $cleanedProductionsList = array_merge($cleanedProductionsList, $visitor->getEpsilonAlternatives());
     return $cleanedProductionsList;
 }
コード例 #4
0
ファイル: Normalizer.php プロジェクト: helstern/nomsky-lib
 /**
  * @param \Helstern\Nomsky\Grammar\Production\Production $p
  *
  * @return \Helstern\Nomsky\GrammarAnalysis\Production\NormalizedProduction
  * @throws \Exception
  */
 public function normalizeProduction(Production $p)
 {
     $expression = $p->getExpression();
     if ($expression instanceof ExpressionSymbol) {
         $lhs = $p->getNonTerminal();
         $normalized = $this->processExpressionSymbolProduction($lhs, $expression);
         return $normalized;
     }
     if ($expression instanceof Concatenation) {
         $lhs = $p->getNonTerminal();
         $normalized = $this->processConcatenationProduction($lhs, $expression);
         return $normalized;
     }
     throw new \Exception('the production has not been simplified enough');
 }