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<?php
/**
* Checks the cyclomatic complexity (McCabe) for functions.
*
* PHP version 5
*
* @category PHP
* @package PHP_CodeSniffer
* @author Greg Sherwood <gsherwood@squiz.net>
* @author Marc McIntyre <mmcintyre@squiz.net>
* @copyright 2006-2011 Squiz Pty Ltd (ABN 77 084 670 600)
* @license http://matrix.squiz.net/developer/tools/php_cs/licence BSD Licence
* @link http://pear.php.net/package/PHP_CodeSniffer
*/
/**
* Checks the cyclomatic complexity (McCabe) for functions.
*
* The cyclomatic complexity (also called McCabe code metrics)
* indicates the complexity within a function by counting
* the different paths the function includes.
*
* @category PHP
* @package PHP_CodeSniffer
* @author Johann-Peter Hartmann <hartmann@mayflower.de>
* @author Greg Sherwood <gsherwood@squiz.net>
* @copyright 2007 Mayflower GmbH
* @license http://matrix.squiz.net/developer/tools/php_cs/licence BSD Licence
* @version Release: 1.3.3
* @link http://pear.php.net/package/PHP_CodeSniffer
*/
class Generic_Sniffs_Metrics_CyclomaticComplexitySniff implements PHP_CodeSniffer_Sniff
{
/**
* A complexity higher than this value will throw a warning.
*
* @var int
*/
public $complexity = 10;
/**
* A complexity higer than this value will throw an error.
*
* @var int
*/
public $absoluteComplexity = 20;
/**
* Returns an array of tokens this test wants to listen for.
*
* @return array
*/
public function register()
{
return array(T_FUNCTION);
}//end register()
/**
* Processes this test, when one of its tokens is encountered.
*
* @param PHP_CodeSniffer_File $phpcsFile The file being scanned.
* @param int $stackPtr The position of the current token
* in the stack passed in $tokens.
*
* @return void
*/
public function process(PHP_CodeSniffer_File $phpcsFile, $stackPtr)
{
$this->currentFile = $phpcsFile;
$tokens = $phpcsFile->getTokens();
// Ignore abstract methods.
if (isset($tokens[$stackPtr]['scope_opener']) === false) {
return;
}
// Detect start and end of this function definition.
$start = $tokens[$stackPtr]['scope_opener'];
$end = $tokens[$stackPtr]['scope_closer'];
// Predicate nodes for PHP.
$find = array(
'T_CASE',
'T_DEFAULT',
'T_CATCH',
'T_IF',
'T_FOR',
'T_FOREACH',
'T_WHILE',
'T_DO',
'T_ELSEIF',
);
$complexity = 1;
// Iterate from start to end and count predicate nodes.
for ($i = ($start + 1); $i < $end; $i++) {
if (in_array($tokens[$i]['type'], $find) === true) {
$complexity++;
}
}
if ($complexity > $this->absoluteComplexity) {
$error = 'Function\'s cyclomatic complexity (%s) exceeds allowed maximum of %s';
$data = array(
$complexity,
$this->absoluteComplexity,
);
$phpcsFile->addError($error, $stackPtr, 'MaxExceeded', $data);
} else if ($complexity > $this->complexity) {
$warning = 'Function\'s cyclomatic complexity (%s) exceeds %s; consider refactoring the function';
$data = array(
$complexity,
$this->complexity,
);
$phpcsFile->addWarning($warning, $stackPtr, 'TooHigh', $data);
}
return;
}//end process()
}//end class
?>
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