/**
* Returns a child node at the given index.
*
* @param integer $index The child offset.
*
* @return \PHPMD\Node\ASTNode
*/
public function getChild($index)
{
return new ASTNode($this->node->getChild($index), $this->getFileName());
}
/**
* This method calculates the NPath Complexity of a while-statement, the
* meassured value is then returned as a string.
*
* <code>
* while (<expr>)
* <while-range>
* S;
*
* -- NP(while) = NP(<while-range>) + NP(<expr>) + 1 --
* </code>
*
* @param \PDepend\Source\AST\ASTNode $node The currently visited node.
* @param string $data The previously calculated npath value.
*
* @return string
* @since 0.9.12
*/
public function visitWhileStatement($node, $data)
{
$expr = $this->sumComplexity($node->getChild(0));
$stmt = $node->getChild(1)->accept($this, 1);
$npath = MathUtil::add($expr, $stmt);
$npath = MathUtil::add($npath, '1');
return MathUtil::mul($npath, $data);
}