class DisallowSelfActionsSniff

class DisallowSelfActionsSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_CLASS,
        ];
    }
    
    //end register()
    
    /**
     * Processes this sniff, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\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(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        // We are not interested in abstract classes.
        $prev = $phpcsFile->findPrevious(T_WHITESPACE, $stackPtr - 1, null, true);
        if ($prev !== false && $tokens[$prev]['code'] === T_ABSTRACT) {
            return;
        }
        // We are only interested in Action classes.
        $classNameToken = $phpcsFile->findNext(T_WHITESPACE, $stackPtr + 1, null, true);
        $className = $tokens[$classNameToken]['content'];
        if (substr($className, -7) !== 'Actions') {
            return;
        }
        $foundFunctions = [];
        $foundCalls = [];
        // Find all static method calls in the form self::method() in the class.
        $classEnd = $tokens[$stackPtr]['scope_closer'];
        for ($i = $classNameToken + 1; $i < $classEnd; $i++) {
            if ($tokens[$i]['code'] !== T_DOUBLE_COLON) {
                if ($tokens[$i]['code'] === T_FUNCTION) {
                    // Cache the function information.
                    $funcName = $phpcsFile->findNext(T_STRING, $i + 1);
                    $funcScope = $phpcsFile->findPrevious(Tokens::$scopeModifiers, $i - 1);
                    $foundFunctions[$tokens[$funcName]['content']] = strtolower($tokens[$funcScope]['content']);
                }
                continue;
            }
            $prevToken = $phpcsFile->findPrevious(T_WHITESPACE, $i - 1, null, true);
            if ($tokens[$prevToken]['content'] !== 'self' && $tokens[$prevToken]['content'] !== 'static') {
                continue;
            }
            $funcNameToken = $phpcsFile->findNext(T_WHITESPACE, $i + 1, null, true);
            if ($tokens[$funcNameToken]['code'] === T_VARIABLE) {
                // We are only interested in function calls.
                continue;
            }
            $funcName = $tokens[$funcNameToken]['content'];
            // We've found the function, now we need to find it and see if it is
            // public, private or protected. If it starts with an underscore we
            // can assume it is private.
            if ($funcName[0] === '_') {
                continue;
            }
            $foundCalls[$i] = [
                'name' => $funcName,
                'type' => strtolower($tokens[$prevToken]['content']),
            ];
        }
        
        //end for
        $errorClassName = substr($className, 0, -7);
        foreach ($foundCalls as $token => $funcData) {
            if (isset($foundFunctions[$funcData['name']]) === false) {
                // Function was not in this class, might have come from the parent.
                // Either way, we can't really check this.
                continue;
            }
            else {
                if ($foundFunctions[$funcData['name']] === 'public') {
                    $type = $funcData['type'];
                    $error = "Static calls to public methods in Action classes must not use the {$type} keyword; use %s::%s() instead";
                    $data = [
                        $errorClassName,
                        $funcName,
                    ];
                    $phpcsFile->addError($error, $token, 'Found' . ucfirst($funcData['type']), $data);
                }
            }
        }
    }
    
    //end process()

}