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Filename : ConsoleLogger.php
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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Console\Logger;

use Psr\Log\AbstractLogger;
use Psr\Log\InvalidArgumentException;
use Psr\Log\LogLevel;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Output\ConsoleOutputInterface;

/**
 * PSR-3 compliant console logger.
 *
 * @author Kévin Dunglas <dunglas@gmail.com>
 *
 * @see http://www.php-fig.org/psr/psr-3/
 */
class ConsoleLogger extends AbstractLogger
{
    const INFO = 'info';
    const ERROR = 'error';

    /**
     * @var OutputInterface
     */
    private $output;
    /**
     * @var array
     */
    private $verbosityLevelMap = array(
        LogLevel::EMERGENCY => OutputInterface::VERBOSITY_NORMAL,
        LogLevel::ALERT => OutputInterface::VERBOSITY_NORMAL,
        LogLevel::CRITICAL => OutputInterface::VERBOSITY_NORMAL,
        LogLevel::ERROR => OutputInterface::VERBOSITY_NORMAL,
        LogLevel::WARNING => OutputInterface::VERBOSITY_NORMAL,
        LogLevel::NOTICE => OutputInterface::VERBOSITY_VERBOSE,
        LogLevel::INFO => OutputInterface::VERBOSITY_VERY_VERBOSE,
        LogLevel::DEBUG => OutputInterface::VERBOSITY_DEBUG,
    );
    /**
     * @var array
     */
    private $formatLevelMap = array(
        LogLevel::EMERGENCY => self::ERROR,
        LogLevel::ALERT => self::ERROR,
        LogLevel::CRITICAL => self::ERROR,
        LogLevel::ERROR => self::ERROR,
        LogLevel::WARNING => self::INFO,
        LogLevel::NOTICE => self::INFO,
        LogLevel::INFO => self::INFO,
        LogLevel::DEBUG => self::INFO,
    );
    private $errored = false;

    /**
     * @param OutputInterface $output
     * @param array           $verbosityLevelMap
     * @param array           $formatLevelMap
     */
    public function __construct(OutputInterface $output, array $verbosityLevelMap = array(), array $formatLevelMap = array())
    {
        $this->output = $output;
        $this->verbosityLevelMap = $verbosityLevelMap + $this->verbosityLevelMap;
        $this->formatLevelMap = $formatLevelMap + $this->formatLevelMap;
    }

    /**
     * {@inheritdoc}
     */
    public function log($level, $message, array $context = array())
    {
        if (!isset($this->verbosityLevelMap[$level])) {
            throw new InvalidArgumentException(sprintf('The log level "%s" does not exist.', $level));
        }

        $output = $this->output;

        // Write to the error output if necessary and available
        if ($this->formatLevelMap[$level] === self::ERROR) {
            if ($this->output instanceof ConsoleOutputInterface) {
                $output = $output->getErrorOutput();
            }
            $this->errored = true;
        }

        // the if condition check isn't necessary -- it's the same one that $output will do internally anyway.
        // We only do it for efficiency here as the message formatting is relatively expensive.
        if ($output->getVerbosity() >= $this->verbosityLevelMap[$level]) {
            $output->writeln(sprintf('<%1$s>[%2$s] %3$s</%1$s>', $this->formatLevelMap[$level], $level, $this->interpolate($message, $context)), $this->verbosityLevelMap[$level]);
        }
    }

    /**
     * Returns true when any messages have been logged at error levels.
     */
    public function hasErrored()
    {
        return $this->errored;
    }

    /**
     * Interpolates context values into the message placeholders.
     *
     * @author PHP Framework Interoperability Group
     *
     * @param string $message
     * @param array  $context
     *
     * @return string
     */
    private function interpolate($message, array $context)
    {
        // build a replacement array with braces around the context keys
        $replace = array();
        foreach ($context as $key => $val) {
            if (!is_array($val) && (!is_object($val) || method_exists($val, '__toString'))) {
                $replace[sprintf('{%s}', $key)] = $val;
            }
        }

        // interpolate replacement values into the message and return
        return strtr($message, $replace);
    }
}