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<?php |
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/* |
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* (c) Jean-François Lépine <https://twitter.com/Halleck45> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Hal\Metrics\Complexity\Component\McCabe; |
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use Hal\Component\Token\Tokenizer; |
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/** |
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* Calculates cyclomatic complexity |
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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 McCabe { |
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/** |
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* Tokenizer |
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* |
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* @var \Hal\Component\Token\Tokenizer |
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*/ |
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private $tokenizer; |
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/** |
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* Constructor |
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* |
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* @param Tokenizer $tokenizer |
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*/ |
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public function __construct(Tokenizer $tokenizer) { |
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$this->tokenizer = $tokenizer; |
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} |
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/** |
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* Calculate cyclomatic complexity number |
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* |
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* We can calculate ccn in two ways (we choose the second): |
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* |
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* 1. Cyclomatic complexity (CC) = E - N + 2P |
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* Where: |
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* P = number of disconnected parts of the flow graph (e.g. a calling program and a subroutine) |
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* E = number of edges (transfers of control) |
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* N = number of nodes (sequential group of statements containing only one transfer of control) |
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* |
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* 2. CC = Number of each decision point |
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* |
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* @param string $filename |
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* @return Result |
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*/ |
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public function calculate($filename) |
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{ |
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$info = new Result; |
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$tokens = $this->tokenizer->tokenize($filename); |
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$ccn = 1; // default path |
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foreach($tokens as $token) { |
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switch($token->getType()) { |
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case T_IF: |
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case T_ELSEIF: |
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case T_FOREACH: |
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case T_FOR: |
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case T_WHILE: |
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case T_DO: |
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case T_BOOLEAN_AND: |
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case T_LOGICAL_AND: |
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case T_BOOLEAN_OR: |
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case T_LOGICAL_OR: |
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case T_SPACESHIP: |
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case T_CASE: |
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case T_DEFAULT: |
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case T_CATCH: |
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case T_CONTINUE: |
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$ccn++; |
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break; |
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case T_STRING: |
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if('?' == $token->getValue()) { |
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$ccn = $ccn + 2; |
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} |
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break; |
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case T_COALESCE: |
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$ccn = $ccn + 2; |
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break; |
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} |
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} |
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$info->setCyclomaticComplexityNumber(max(1, $ccn)); |
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return $info; |
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} |
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} |
Halleck45 /
PhpMetrics
