/**
* @param RepetitionNode $astNode
*
* @return bool
*/
public function postVisitRepetitionNode(RepetitionNode $astNode)
{
$child = $this->visitContext->popOneExpression($this);
$expression = new Repetition($child);
$this->visitContext->pushExpression($expression);
return true;
}
/**
* @param OptionalNode $astNode
*
* @return bool
*/
public function postVisitOptionalNode(OptionalNode $astNode)
{
$child = $this->visitContext->popOneExpression($this);
$expression = new Optional($child);
$this->visitContext->pushExpression($expression);
return true;
}
/**
* @param IdentifierNode $astNode
* @return bool
* @throws \DomainException
*/
public function visitIdentifierNode(IdentifierNode $astNode)
{
$name = $astNode->getIdentifierName();
$uppercase = strtoupper($name);
if ($uppercase == $name) {
$expression = new ExpressionSymbol(Symbol::TYPE_TERMINAL, $name);
$this->visitContext->pushExpression($expression);
return true;
}
$lowercase = strtolower($name);
if ($lowercase == $name) {
$expression = new ExpressionSymbol(Symbol::TYPE_NON_TERMINAL, $name);
$this->visitContext->pushExpression($expression);
return true;
}
throw new \DomainException('unknown type of identifier name');
}
/**
* @param ChoiceNode $astNode
*
* @return bool
*/
public function postVisitChoiceNode(ChoiceNode $astNode)
{
$children = $this->visitContext->popExpressions($this);
$expression = new Choice(array_shift($children), $children);
$this->visitContext->pushExpression($expression);
}
/**
* @param GroupNode $astNode
*
* @return bool
*/
public function postVisitGroupNode(GroupNode $astNode)
{
$child = $this->visitContext->popOneExpression($this);
$expression = new Group($child);
$this->visitContext->pushExpression($expression);
}
/**
* @param LiteralNode $astNode
*
* @return bool
*/
public function visitLiteralNode(LiteralNode $astNode)
{
$expression = new ExpressionSymbol(Symbol::TYPE_TERMINAL, $astNode->getLiteral());
$this->visitContext->pushExpression($expression);
return true;
}
