class MultiLineAssignmentSniff

class MultiLineAssignmentSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_EQUAL,
        ];
    }
    
    //end register()
    
    /**
     * Processes this test, 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();
        // Equal sign can't be the last thing on the line.
        $next = $phpcsFile->findNext(T_WHITESPACE, $stackPtr + 1, null, true);
        if ($next === false) {
            // Bad assignment.
            return;
        }
        // Make sure it is the first thing on the line, otherwise we ignore it.
        $prev = $phpcsFile->findPrevious(T_WHITESPACE, $stackPtr - 1, null, true);
        if ($prev === false) {
            // Bad assignment.
            return;
        }
        if ($tokens[$prev]['line'] === $tokens[$stackPtr]['line']) {
            return;
        }
        // Find the required indent based on the ident of the previous line.
        $assignmentIndent = 0;
        $prevLine = $tokens[$prev]['line'];
        for ($i = $prev - 1; $i >= 0; $i--) {
            if ($tokens[$i]['line'] !== $prevLine) {
                $i++;
                break;
            }
        }
        if ($tokens[$i]['code'] === T_WHITESPACE) {
            $assignmentIndent = strlen($tokens[$i]['content']);
        }
        // Find the actual indent.
        $prev = $phpcsFile->findPrevious(T_WHITESPACE, $stackPtr - 1);
        $expectedIndent = $assignmentIndent + 2;
        $foundIndent = strlen($tokens[$prev]['content']);
        if ($foundIndent !== $expectedIndent) {
            $error = "Multi-line assignment not indented correctly; expected {$expectedIndent} spaces but found {$foundIndent}";
            $phpcsFile->addError($error, $stackPtr, 'MultiLineAssignmentIndent');
        }
    }
    
    //end process()

}