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Filename : NormalizerFormatter.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.
 */

/**
 * Normalizes incoming records to remove objects/resources so it's easier to dump to various targets
 *
 * @author Jordi Boggiano <j.boggiano@seld.be>
 */
class Monolog_Formatter_NormalizerFormatter implements Monolog_Formatter_FormatterInterface
{
    const SIMPLE_DATE = "Y-m-d H:i:s";

    protected $dateFormat;

    /**
     * @param string $dateFormat The format of the timestamp: one supported by DateTime::format
     */
    public function __construct($dateFormat = null)
    {
        $this->dateFormat = $dateFormat ? $dateFormat : self::SIMPLE_DATE;
    }

    /**
     * {@inheritdoc}
     */
    public function format(array $record)
    {
        return $this->normalize($record);
    }

    /**
     * {@inheritdoc}
     */
    public function formatBatch(array $records)
    {
        foreach ($records as $key => $record) {
            $records[$key] = $this->format($record);
        }

        return $records;
    }

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

        if (is_array($data) || $data instanceof Traversable) {
            $normalized = array();

            $count = 1;
            foreach ($data as $key => $value) {
                if ($count++ >= 1000) {
                    $normalized['...'] = 'Over 1000 items, aborting normalization';
                    break;
                }
                $normalized[$key] = $this->normalize($value);
            }

            return $normalized;
        }

        if ($data instanceof DateTime) {
            return $data->format($this->dateFormat);
        }

        if (is_object($data)) {
            if ($data instanceof Exception) {
                return $this->normalizeException($data);
            }

            return sprintf("[object] (%s: %s)", get_class($data), $this->toJson($data, true));
        }

        if (is_resource($data)) {
            return '[resource]';
        }

        return '[unknown('.gettype($data).')]';
    }

    protected function normalizeException(Exception $e)
    {
        $data = array(
            'class'   => get_class($e),
            'message' => $e->getMessage(),
            'file'    => $e->getFile().':'.$e->getLine(),
        );

        $trace = $e->getTrace();
        array_shift($trace);
        foreach ($trace as $frame) {
            if (isset($frame['file'])) {
                $data['trace'][] = $frame['file'].':'.$frame['line'];
            } else {
                $data['trace'][] = json_encode($frame);
            }
        }

        $previous = null;

        if (is_callable(array($e, 'getPrevious'))) {
            $previous = $e->getPrevious();
        } elseif (is_callable($e, 'getPreviousException')) {
            $previous = $e->getPreviousException();
        }

        if ($previous) {
            $data['previous'] = $this->normalizeException($previous);
        }

        return $data;
    }

    protected function toJson($data, $ignoreErrors = false)
    {
        // suppress json_encode errors since it's twitchy with some inputs
        if ($ignoreErrors) {
            if (version_compare(PHP_VERSION, '5.4.0', '>=')) {
                return @json_encode($data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
            }

            return @json_encode($data);
        }

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

        return json_encode($data);
    }
}