<?php
/**
 * \Drupal\Sniffs\Commenting\PostStatementCommentSniff.
 *
 * @category PHP
 * @package  PHP_CodeSniffer
 * @link     http://pear.php.net/package/PHP_CodeSniffer
 */

namespace Drupal\Sniffs\Commenting;

use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Sniffs\Sniff;

/**
 * Largely copied from
 * \PHP_CodeSniffer\Standards\Squiz\Sniffs\Commenting\PostStatementCommentSniff
 * but we want the fixer to move the comment to the previous line.
 *
 * @category PHP
 * @package  PHP_CodeSniffer
 * @link     http://pear.php.net/package/PHP_CodeSniffer
 */
class PostStatementCommentSniff implements Sniff
{

    /**
     * A list of tokenizers this sniff supports.
     *
     * @var array
     */
    public $supportedTokenizers = array('PHP');


    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array
     */
    public function register()
    {
        return array(T_COMMENT);

    }//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();

        if (substr($tokens[$stackPtr]['content'], 0, 2) !== '//') {
            return;
        }

        $commentLine = $tokens[$stackPtr]['line'];
        $lastContent = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);

        if ($tokens[$lastContent]['line'] !== $commentLine) {
            return;
        }

        if ($tokens[$lastContent]['code'] === T_CLOSE_CURLY_BRACKET) {
            return;
        }

        // Special case for JS files.
        if ($tokens[$lastContent]['code'] === T_COMMA
            || $tokens[$lastContent]['code'] === T_SEMICOLON
        ) {
            $lastContent = $phpcsFile->findPrevious(T_WHITESPACE, ($lastContent - 1), null, true);
            if ($tokens[$lastContent]['code'] === T_CLOSE_CURLY_BRACKET) {
                return;
            }
        }

        $error = 'Comments may not appear after statements';
        $fix   = $phpcsFile->addFixableError($error, $stackPtr, 'Found');
        if ($fix === true) {
            if ($tokens[$lastContent]['code'] === T_OPEN_TAG) {
                $phpcsFile->fixer->addNewlineBefore($stackPtr);
                return;
            }

            $lineStart = $stackPtr;
            while ($tokens[$lineStart]['line'] === $tokens[$stackPtr]['line']
                && $tokens[$lineStart]['code'] !== T_OPEN_TAG
            ) {
                $lineStart--;
            }

            $phpcsFile->fixer->beginChangeset();
            $phpcsFile->fixer->addContent($lineStart, $tokens[$stackPtr]['content']);
            $phpcsFile->fixer->replaceToken($stackPtr, $phpcsFile->eolChar);
            $phpcsFile->fixer->endChangeset();
        }

    }//end process()


}//end class
