Bledheg generator

bledheg.php

#! /usr/bin/env php
<?php

$input = $argv[1] ?? null;
if (is_null($input) || $input < -5 || $input > 20) {
    exit("Bilangan bulat tidak termasuk dalam rentang yang diizinkan: -5 s/d 20!\n");
}

if ($input < 1) {
    exit();
}

$totalLoop = (2 * $input) - 1;

foreach (range(1, $totalLoop) as $i) {
    $posY = $i - $input;

    foreach (range(1, $totalLoop) as $j) {
        switch ($posY <=> 0) {
            case -1:
                $posX = $i + $j - $input - 1;
                
                if ($posX < 0 || $j > $input || abs($posX % 2) === 1) {
                    echo ' ';
                    break;
                }

                if (abs($posX % 4) === 0) {
                    echo 'x';
                    break;
                }

                echo 'o';
                break;
            case 1:
                $posX = $i + $j - ($input * 3) + 1;

                if ($posX > 0 || $j < $input || abs($posX % 2) === 1) {
                    echo ' ';
                    break;
                }

                if (abs($posX % 4) === 0) {
                    echo 'x';
                    break;
                }

                echo 'o';
                break;
            case 0:
                $posX = $input - abs($j - $input);

                if ($posX % 2 === 0) {
                    echo ' ';
                    break;
                }

                if ($posX % 4 === 1) {
                    echo 'x';
                    break;
                }

                echo 'o';
                break;
        }
    }
    echo "\n";
}