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[EDIT] FILE: Checkstyle.php

<?php
/**
 * Checkstyle report for PHP_CodeSniffer.
 *
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Reports;

use PHP_CodeSniffer\Config;
use PHP_CodeSniffer\Files\File;
use XMLWriter;

class Checkstyle implements Report
{

/**
     * Generate a partial report for a single processed file.
     *
     * Function should return TRUE if it printed or stored data about the file
     * and FALSE if it ignored the file. Returning TRUE indicates that the file and
     * its data should be counted in the grand totals.
     *
     * @param array<string, string|int|array> $report      Prepared report data.
     *                                                     See the {@see Report} interface for a detailed specification.
     * @param \PHP_CodeSniffer\Files\File     $phpcsFile   The file being reported on.
     * @param bool                            $showSources Show sources?
     * @param int                             $width       Maximum allowed line width.
     *
     * @return bool
     */
    public function generateFileReport($report, File $phpcsFile, $showSources=false, $width=80)
    {
        $out = new XMLWriter;
        $out->openMemory();
        $out->setIndent(true);

if ($report['errors'] === 0 && $report['warnings'] === 0) {
            // Nothing to print.
            return false;
        }

$out->startElement('file');
        $out->writeAttribute('name', $report['filename']);

foreach ($report['messages'] as $line => $lineErrors) {
            foreach ($lineErrors as $column => $colErrors) {
                foreach ($colErrors as $error) {
                    $error['type'] = strtolower($error['type']);
                    if ($phpcsFile->config->encoding !== 'utf-8') {
                        $error['message'] = iconv($phpcsFile->config->encoding, 'utf-8', $error['message']);
                    }

$out->startElement('error');
                    $out->writeAttribute('line', $line);
                    $out->writeAttribute('column', $column);
                    $out->writeAttribute('severity', $error['type']);
                    $out->writeAttribute('message', $error['message']);
                    $out->writeAttribute('source', $error['source']);
                    $out->endElement();
                }
            }
        }//end foreach

$out->endElement();
        echo $out->flush();

return true;

}//end generateFileReport()

/**
     * Prints all violations for processed files, in a Checkstyle format.
     *
     * @param string $cachedData    Any partial report data that was returned from
     *                              generateFileReport during the run.
     * @param int    $totalFiles    Total number of files processed during the run.
     * @param int    $totalErrors   Total number of errors found during the run.
     * @param int    $totalWarnings Total number of warnings found during the run.
     * @param int    $totalFixable  Total number of problems that can be fixed.
     * @param bool   $showSources   Show sources?
     * @param int    $width         Maximum allowed line width.
     * @param bool   $interactive   Are we running in interactive mode?
     * @param bool   $toScreen      Is the report being printed to screen?
     *
     * @return void
     */
    public function generate(
        $cachedData,
        $totalFiles,
        $totalErrors,
        $totalWarnings,
        $totalFixable,
        $showSources=false,
        $width=80,
        $interactive=false,
        $toScreen=true
    ) {
        echo '<?xml version="1.0" encoding="UTF-8"?>'.PHP_EOL;
        echo '<checkstyle version="'.Config::VERSION.'">'.PHP_EOL;
        echo $cachedData;
        echo '</checkstyle>'.PHP_EOL;

}//end generate()

}//end class

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