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<?php declare(strict_types = 1); |
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namespace Churn\Assessors\CyclomaticComplexity; |
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class CyclomaticComplexityAssessor |
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{ |
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/** |
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* The total cyclomatic complexity score. |
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* @var integer. |
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*/ |
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protected $score; |
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/** |
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* Asses the files cyclomatic complexity. |
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* @param string $filePath Path and file name. |
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* @return integer |
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*/ |
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public function assess($filePath): int |
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{ |
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$this->score = 0; |
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$contents = $this->getFileContents($filePath); |
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$this->countTheMethods($contents); |
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$this->countTheIfStatements($contents); |
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$this->countTheElseIfStatements($contents); |
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$this->countTheWhileLoops($contents); |
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$this->countTheForLoops($contents); |
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$this->countTheCaseStatements($contents); |
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$this->countTheTernaryOperators($contents); |
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$this->countTheLogicalAnds($contents); |
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$this->countTheLogicalOrs($contents); |
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if ($this->score == 0) { |
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$this->score = 1; |
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} |
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return $this->score; |
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} |
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/** |
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* Count how many methods there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheMethods($contents) |
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{ |
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preg_match("/[ ]function[ ]/", $contents, $matches); |
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if (isset($matches[0])) { |
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$this->score ++; |
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} |
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} |
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/** |
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* Count how many if statements there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheIfStatements($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/[ ]if[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many else if statements there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheElseIfStatements($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/else[ ]{0,}if[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many while loops there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheWhileLoops($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/while[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many for loops there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheForLoops($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/[ ]for(each){0,1}[ ]{0,}\(/", $contents); |
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} |
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/** |
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* Count how many case statements there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheCaseStatements($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/[ ]case[ ]{1}(.*)\:/", $contents); |
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} |
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/** |
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* Count how many ternary operators there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheTernaryOperators($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/[ ]\?.*:.*;/", $contents); |
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} |
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/** |
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* Count how many '&&' there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheLogicalAnds($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/[ ]&&[ ]/", $contents); |
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} |
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/** |
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* Count how many '||' there are. |
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* @param string $contents File contents. |
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* @return void |
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*/ |
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protected function countTheLogicalOrs($contents) |
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{ |
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$this->score += $this->howmAnyPatternMatches("/[ ]\|\|[ ]/", $contents); |
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} |
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/** |
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* For the given $pattern on $string, how many matches are returned? |
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* @param string $pattern Regex pattern. |
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* @param string $string Any string. |
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* @return integer |
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*/ |
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protected function howManyPatternMatches($pattern, $string): int |
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{ |
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preg_match_all($pattern, $string, $matches); |
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if (isset($matches[0])) { |
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return count($matches[0]); |
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} |
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return 0; |
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} |
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/** |
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* Return the contents of the provided file at $filePath. |
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* @param string $filePath Path and filename. |
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* @return string |
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*/ |
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protected function getFileContents($filePath): string |
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{ |
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return file_get_contents($filePath); |
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} |
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} |
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bmitch /
churn-php
