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<?php |
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namespace Hal\Metric\Class_\Structural; |
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use Hal\Metric\Helper\MetricClassNameGenerator; |
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use Hal\Metric\MetricNullException; |
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use Hal\Metric\Metrics; |
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use PhpParser\Node; |
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use PhpParser\Node\Stmt; |
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use PhpParser\NodeVisitorAbstract; |
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/** |
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* Calculates Card And Agresti metric |
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* |
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* Fan-out = Structural fan-out = Number of other procedures this procedure calls |
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* v = number of input/output variables for a procedure |
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* |
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* (SC) Structural complexity = fan-out^2 |
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* (DC) Data complexity = v / (fan-out + 1) |
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* |
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* @author Jean-François Lépine <https://twitter.com/Halleck45> |
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*/ |
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class SystemComplexityVisitor extends NodeVisitorAbstract |
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{ |
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/** |
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* @var Metrics |
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*/ |
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private $metrics; |
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/** |
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* @param Metrics $metrics |
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*/ |
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public function __construct(Metrics $metrics) |
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{ |
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$this->metrics = $metrics; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function leaveNode(Node $node) |
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{ |
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if ($node instanceof Stmt\Class_ || $node instanceof Stmt\Trait_) { |
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$name = MetricClassNameGenerator::getName($node); |
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$class = $this->metrics->get($name); |
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if ($class === null) { |
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throw new MetricNullException($name, self::class); |
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} |
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$sy = $dc = $sc = []; |
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foreach ($node->stmts as $stmt) { |
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if ($stmt instanceof Stmt\ClassMethod) { |
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// number of returns and calls |
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$output = 0; |
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$fanout = []; |
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iterate_over_node($node, function ($node) use (&$output, &$fanout) { |
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switch (true) { |
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case $node instanceof Stmt\Return_: |
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$output++; |
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break; |
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case $node instanceof Node\Expr\StaticCall: |
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case $node instanceof Node\Expr\MethodCall: |
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array_push($fanout, getNameOfNode($node)); |
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} |
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}); |
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$fanout = count(array_unique($fanout)); |
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$v = count($stmt->params) + $output; |
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$ldc = $v / ($fanout + 1); |
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$lsc = pow($fanout, 2); |
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$sy[] = $ldc + $lsc; |
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$dc[] = $ldc; |
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$sc[] = $lsc; |
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} |
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} |
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// average for class |
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$class |
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->set('relativeStructuralComplexity', empty($sc) ? 0 : round(array_sum($sc) / count($sc), 2)) |
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->set('relativeDataComplexity', empty($dc) ? 0 : round(array_sum($dc) / count($dc), 2)) |
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->set('relativeSystemComplexity', empty($sy) ? 0 : round(array_sum($sy) / count($sy), 2)) |
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->set('totalStructuralComplexity', round(array_sum($sc), 2)) |
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->set('totalDataComplexity', round(array_sum($dc), 2)) |
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->set('totalSystemComplexity', round(array_sum($dc) + array_sum($sc), 2)); |
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} |
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return null; |
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} |
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} |
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phpmetrics /
PhpMetrics
