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<?php
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/**
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 * Squiz_Sniffs_Functions_FunctionDuplicateArgumentSpacingSniff.
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 *
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 * PHP version 5
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 *
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 * @category  PHP
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 * @package   PHP_CodeSniffer
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 * @author    Greg Sherwood <gsherwood@squiz.net>
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 * @author    Marc McIntyre <mmcintyre@squiz.net>
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 * @copyright 2006 Squiz Pty Ltd (ABN 77 084 670 600)
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 * @license   http://matrix.squiz.net/developer/tools/php_cs/licence BSD Licence
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 * @version   CVS: $Id: FunctionDuplicateArgumentSniff.php 244439 2007-10-19 07:06:57Z squiz $
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 * @link      http://pear.php.net/package/PHP_CodeSniffer
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 */
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/**
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 * Squiz_Sniffs_Functions_FunctionDuplicateArgumentSpacingSniff.
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 *
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 * Checks that duplicate arguments are not used in function declarations.
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 *
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 * @category  PHP
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 * @package   PHP_CodeSniffer
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 * @author    Greg Sherwood <gsherwood@squiz.net>
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 * @author    Marc McIntyre <mmcintyre@squiz.net>
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 * @copyright 2006 Squiz Pty Ltd (ABN 77 084 670 600)
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 * @license   http://matrix.squiz.net/developer/tools/php_cs/licence BSD Licence
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 * @version   Release: 1.2.1
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 * @link      http://pear.php.net/package/PHP_CodeSniffer
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 */
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class Squiz_Sniffs_Functions_FunctionDuplicateArgumentSniff implements PHP_CodeSniffer_Sniff
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{
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    /**
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     * Returns an array of tokens this test wants to listen for.
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     *
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     * @return array
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     */
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    public function register()
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    {
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        return array(T_FUNCTION);
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    }//end register()
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    /**
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     * Processes this test, when one of its tokens is encountered.
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     *
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     * @param PHP_CodeSniffer_File $phpcsFile The file being scanned.
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     * @param int                  $stackPtr  The position of the current token
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     *                                        in the stack passed in $tokens.
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     *
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     * @return void
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     */
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    public function process(PHP_CodeSniffer_File $phpcsFile, $stackPtr)
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    {
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        $tokens = $phpcsFile->getTokens();
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        $openBracket  = $tokens[$stackPtr]['parenthesis_opener'];
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        $closeBracket = $tokens[$stackPtr]['parenthesis_closer'];
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        $foundVariables = array();
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        for ($i = ($openBracket + 1); $i < $closeBracket; $i++) {
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            if ($tokens[$i]['code'] === T_VARIABLE) {
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                $variable = $tokens[$i]['content'];
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                if (in_array($variable, $foundVariables) === true) {
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                    $error = "Variable \"$variable\" appears more than once in function declaration";
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                    $phpcsFile->addError($error, $i);
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                } else {
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                    $foundVariables[] = $variable;
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                }
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            }
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        }
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    }//end process()
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}//end class
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?>