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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;

class Terminal
{
    private static $width;
    private static $height;

/**
     * Gets the terminal width.
     *
     * @return int
     */
    public function getWidth()
    {
        $width = getenv('COLUMNS');
        if (false !== $width) {
            return (int) trim($width);
        }

if (null === self::$width) {
            self::initDimensions();
        }

return self::$width ?: 80;
    }

/**
     * Gets the terminal height.
     *
     * @return int
     */
    public function getHeight()
    {
        $height = getenv('LINES');
        if (false !== $height) {
            return (int) trim($height);
        }

if (null === self::$height) {
            self::initDimensions();
        }

return self::$height ?: 50;
    }

private static function initDimensions()
    {
        if ('\\' === \DIRECTORY_SEPARATOR) {
            if (preg_match('/^(\d+)x(\d+)(?: $(\d+)x(\d+)$)?$/', trim(getenv('ANSICON')), $matches)) {
                // extract [w, H] from "wxh (WxH)"
                // or [w, h] from "wxh"
                self::$width = (int) $matches[1];
                self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];
            } elseif (null !== $dimensions = self::getConsoleMode()) {
                // extract [w, h] from "wxh"
                self::$width = (int) $dimensions[0];
                self::$height = (int) $dimensions[1];
            }
        } elseif ($sttyString = self::getSttyColumns()) {
            if (preg_match('/rows.(\d+);.columns.(\d+);/i', $sttyString, $matches)) {
                // extract [w, h] from "rows h; columns w;"
                self::$width = (int) $matches[2];
                self::$height = (int) $matches[1];
            } elseif (preg_match('/;.(\d+).rows;.(\d+).columns/i', $sttyString, $matches)) {
                // extract [w, h] from "; h rows; w columns"
                self::$width = (int) $matches[2];
                self::$height = (int) $matches[1];
            }
        }
    }

/**
     * Runs and parses mode CON if it's available, suppressing any error output.
     *
     * @return int[]|null An array composed of the width and the height or null if it could not be parsed
     */
    private static function getConsoleMode()
    {
        if (!\function_exists('proc_open')) {
            return;
        }

$descriptorspec = [
            1 => ['pipe', 'w'],
            2 => ['pipe', 'w'],
        ];
        $process = proc_open('mode CON', $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
        if (\is_resource($process)) {
            $info = stream_get_contents($pipes[1]);
            fclose($pipes[1]);
            fclose($pipes[2]);
            proc_close($process);

if (preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {
                return [(int) $matches[2], (int) $matches[1]];
            }
        }
    }

/**
     * Runs and parses stty -a if it's available, suppressing any error output.
     *
     * @return string|null
     */
    private static function getSttyColumns()
    {
        if (!\function_exists('proc_open')) {
            return;
        }

$descriptorspec = [
            1 => ['pipe', 'w'],
            2 => ['pipe', 'w'],
        ];

$process = proc_open('stty -a | grep columns', $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);
        if (\is_resource($process)) {
            $info = stream_get_contents($pipes[1]);
            fclose($pipes[1]);
            fclose($pipes[2]);
            proc_close($process);

return $info;
        }
    }
}