<?php
/**
 * The MIT License (MIT)
 * 
 * Copyright (c) 2015 Camil Staps
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

header('Content-type: text/plain');

if (exec('echo EXEC') != 'EXEC') {
    die('exec() is disabled.');
}

$extended = isset($_GET['extended']) && $_GET['extended'] != 'false';
$expressions = $_GET['expressions'];

if ($expressions == [])
    die('Not enough expressions requested');

foreach ($expressions as $k => $e)
    if (preg_match('/[^a-zA-Z\|\&~\-><01 ]/', $e))
        die('Forbidden character in expression ' . $e);

$expressions = array_map('escapeshellarg', $expressions);
$expressions = implode(' ', $expressions);
$extended = $extended ? '-e' : '';

$call = './LogicParser -b -nt ' . $extended . ' ' . $expressions;

$out = [];
exec($call, $out);
echo implode("\n", $out);