Initial Commit

Author: jb-lopez

.gitignore

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+vendor/

composer.json

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+{
+    "require": {
+        "symfony/console": "^3.3"
+    },
+    "autoload": {
+        "psr-4": {
+            "Dice\\": "src/"
+        }
+    }
+}

composer.lock

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+#!/usr/bin/env php
+
+<?php 
+
+require_once __DIR__ . '/vendor/autoload.php';
+
+use Dice\RollCommand;
+use Symfony\Component\Console\Application;
+
+$app = new Application();
+
+$app->add(new RollCommand());
+
+$app->run();

dice

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+<?php
+
+namespace Dice;
+
+class Dice
+{
+    public static function rollOne(int $sides)
+    {
+        return (random_int(1, $sides));
+    }
+
+    public static function roll(int $number, int $sides)
+    {
+        $rolls = [];
+        for ($i = 0; $i < $number; $i++) {
+            $rolls[] = self::rollOne($sides);
+        }
+
+        return $rolls;
+    }
+
+    public static function rollLow($number, $sides, $factor = 2)
+    {
+        $rolls = self::rollHigh($number, $sides, $factor);
+        foreach ($rolls as $num => $roll) {
+            $rolls[$num] = $sides + 1 - $roll;
+        }
+
+        return $rolls;
+    }
+
+    public static function rollHigh(int $number, int $sides, float $factor = 2)
+    {
+        $sides = (int)floor(pow($sides, $factor));
+        $rolls = [];
+        for ($i = 0; $i < $number; $i++) {
+            $rolls[] = (int)ceil(pow(self::rollOne($sides), 1 / $factor));
+        }
+
+        return $rolls;
+    }
+}

src/Dice.php

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+<?php
+
+namespace Dice;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class RollCommand extends Command
+{
+
+    protected function configure()
+    {
+        $this->setName("roll")
+             ->setDescription("Rolls fair dice.")
+             ->addArgument('Dice String', InputArgument::REQUIRED, 'e.g.: 2d6, 1d20+4')
+             ->addOption('h', null, InputOption::VALUE_NONE, 'Roll the dice with a bias towards higher numbers')
+             ->addOption('l', null, InputOption::VALUE_NONE, 'Roll the dice with a bias towards lower numbers')
+             ->addOption('f', null, InputOption::VALUE_REQUIRED, 'The factor of the weight', 2)
+        ;
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $dice    = new Dice();
+        $matches = [];
+        preg_match('/(\d+)d(\d+)\+?(\d)?/i', $input->getArgument('Dice String'), $matches);
+        $modifier = empty($matches[3]) ? 0 : (int)$matches[3];
+        if ($input->getOption('h')) {
+            $roll = $dice::rollHigh((int)$matches[1], (int)$matches[2], (float)$input->getOption('f'));
+        } elseif ($input->getOption('l')) {
+            $roll = $dice::rollLow((int)$matches[1], (int)$matches[2], (float)$input->getOption('f'));
+        } else {
+            $roll = $dice::roll((int)$matches[1], (int)$matches[2]);
+        }
+        $output->writeln('Your roll without modifier was ' . array_sum($roll) . ' [' . implode('|', $roll) . '] + ' . $modifier . ' for a total of ' . (array_sum($roll) + $modifier));
+    }
+
+}