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Filename : HtmlFormatter.php
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<?php
/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Formats incoming records into an HTML table
 *
 * This is especially useful for html email logging
 *
 * @author Tiago Brito <tlfbrito@gmail.com>
 */
class Monolog_Formatter_HtmlFormatter extends Monolog_Formatter_NormalizerFormatter
{
    /**
     * Translates Monolog log levels to html color priorities.
     */
    private $logLevels = array(
        Monolog_Logger::DEBUG     => '#cccccc',
        Monolog_Logger::INFO      => '#468847',
        Monolog_Logger::NOTICE    => '#3a87ad',
        Monolog_Logger::WARNING   => '#c09853',
        Monolog_Logger::ERROR     => '#f0ad4e',
        Monolog_Logger::CRITICAL  => '#FF7708',
        Monolog_Logger::ALERT     => '#C12A19',
        Monolog_Logger::EMERGENCY => '#000000',
    );

    /**
     * @param string $dateFormat The format of the timestamp: one supported by DateTime::format
     */
    public function __construct($dateFormat = null)
    {
        parent::__construct($dateFormat);
    }

    /**
     * Creates an HTML table row
     *
     * @param string $th Row header content
     * @param string $td Row standard cell content
     *
     * @return string
     */
    private function addRow($th, $td = ' ')
    {
        $th = htmlspecialchars($th, ENT_NOQUOTES, 'UTF-8');
        $td = '<pre>'.htmlspecialchars($td, ENT_NOQUOTES, 'UTF-8').'</pre>';

        return "<tr style=\"padding: 4px;spacing: 0;text-align: left;\">\n<th style=\"background: #cccccc\" width=\"100px\">$th:</th>\n<td style=\"padding: 4px;spacing: 0;text-align: left;background: #eeeeee\">".$td."</td>\n</tr>";
    }

    /**
     * Create a HTML h1 tag
     *
     * @param string  $title Text to be in the h1
     * @param integer $level Error level
     *
     * @return string
     */
    private function addTitle($title, $level)
    {
        $title = htmlspecialchars($title, ENT_NOQUOTES, 'UTF-8');

        return '<h1 style="background: '.$this->logLevels[$level].';color: #ffffff;padding: 5px;">'.$title.'</h1>';
    }

    /**
     * Formats a log record.
     *
     * @param array $record A record to format
     *
     * @return mixed The formatted record
     */
    public function format(array $record)
    {
        $output = $this->addTitle($record['level_name'], $record['level']);
        $output .= '<table cellspacing="1" width="100%">';

        $output .= $this->addRow('Message', (string) $record['message']);
        $output .= $this->addRow('Time', $record['datetime']->format('Y-m-d\TH:i:s.uO'));
        $output .= $this->addRow('Channel', $record['channel']);
        if ($record['context']) {
            $output .= $this->addRow('Context', $this->convertToString($record['context']));
        }
        if ($record['extra']) {
            $output .= $this->addRow('Extra', $this->convertToString($record['extra']));
        }

        return $output.'</table>';
    }

    /**
     * Formats a set of log records.
     *
     * @param array $records A set of records to format
     *
     * @return mixed The formatted set of records
     */
    public function formatBatch(array $records)
    {
        $message = '';
        foreach ($records as $record) {
            $message .= $this->format($record);
        }

        return $message;
    }

    protected function convertToString($data)
    {
        if (null === $data || is_scalar($data)) {
            return (string) $data;
        }

        $data = $this->normalize($data);
        if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
            return json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
        }

        return str_replace('\\/', '/', json_encode($data));
    }
}