feat: Add basic router

.gitignore

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+.idea

controllers/GET.php

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+<?php
+
+return function (array $context) {
+    echo "Hello World";
+};

controllers/routes.php

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+<?php
+
+require_once(ROOT . "/middleware/renderer.php");
+
+function fromController(string $path) {
+    return function(array $context) use ($path) {
+        return (require(ROOT . "/controllers/" . $path . ".php"))($context);
+    };
+}
+
+return function(Router $router) {
+    $router->addRoute(GET, "/", fromController("/GET"));
+    $router->addRoute(GET, "/test", useRenderer(fromController("/test/GET"), "JSON"));
+};

controllers/test/GET.php

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+<?php
+
+return function (array $context) {
+    $context["renderer"]([
+        "value" => "Hello World!",
+    ]);
+};

core.php

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+<?php
+
+const ROOT = __DIR__;
+
+define("MAINTENANCE_MODE", require(ROOT . "/maintenance.php"));
+
+require_once(ROOT . "/utils/arrays.php");
+
+if (MAINTENANCE_MODE) {
+    require(ROOT . "./templates/maintenance.php");
+} else {
+    $router = require(ROOT . "/router/Router.php");
+
+    (require(ROOT . "/controllers/routes.php"))($router);
+
+    $router->execute();
+}

html/.htaccess

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+<IfModule mod_rewrite.c>
+RewriteEngine On
+RewriteBase /
+
+RewriteRule ^index\.php$ - [L]
+RewriteCond %{REQUEST_URI} !^/static/
+RewriteCond %{REQUEST_FILENAME} !-f
+RewriteCond %{REQUEST_FILENAME} !-d
+RewriteRule . /index.php [L]
+</IfModule>

html/index.php

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+<?php
+
+require("../core.php");

maintenance.php

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+<?php
+
+return false;

middleware/renderer.php

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+<?php
+
+function useRenderer($handler, string $default, string $query_param = "format") {
+    return function (array $context) use ($handler, $default, $query_param) {
+        $rendererMap = require(ROOT . "/renderer/renderer.php");
+
+        $format = array_default($query_param, $_GET);
+        if (!$format || !key_exists(strtoupper($format), $rendererMap)) {
+            $format = $default;
+        }
+
+
+        $context["renderer"] = $rendererMap[strtoupper($format)];
+
+        $handler($context);
+    };
+}

renderer/JSON.php

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+<?php
+
+return function($data) {
+    echo json_encode($data);
+};

renderer/debug.php

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+<?php
+
+return function($data) {
+    var_dump($data);
+};

renderer/renderer.php

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+<?php
+
+return [
+    "JSON" => require(__DIR__ . "/JSON.php"),
+    "DEBUG" => require(__DIR__ . "/debug.php"),
+];

router/Router.php

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+<?php
+
+const GET = "GET";
+const POST = "POST";
+const PUT = "PUT";
+const DELETE = "DELETE";
+const HEAD = "HEAD";
+const CONNECT = "CONNECT";
+const OPTIONS = "OPTIONS";
+const TRACE = "TRACE";
+const PATCH = "PATCH";
+
+class Router {
+    private $routes = [];
+    public $notFoundHandler;
+
+    function __construct() {
+        $this->notFoundHandler = function($context) {
+            header("HTTP/", true, 404);
+            require(ROOT . "/templates/404.php");
+        };
+    }
+
+    private function findRoute(string $method, string $url) {
+        if (!key_exists($method, $this->routes)) {
+            return null;
+        }
+
+        $paths = $this->routes[$method];
+
+        foreach ($paths as $path => $handler) {
+            if (preg_match("/^" . str_replace("/", "\/", $path, ) . "$/", $url)) {
+                return $handler;
+            }
+        }
+
+        return null;
+    }
+
+    private function getPath($uri) {
+        if (($i = strpos($uri, "?")) !== false) {
+            return substr($uri, 0, $i);
+        } else {
+            return $uri;
+        }
+    }
+
+    public function addRoute(string $method, string $path, $handler) {
+        array_get_or_add($method, $this->routes, [])[$path] = $handler;
+    }
+
+    public function execute() {
+        //var_dump($this->routes);
+
+        $path = $this->getPath($_SERVER["REQUEST_URI"]);
+        $route = $this->findRoute($_SERVER["REQUEST_METHOD"], $path);
+
+        if (!$route) {
+            $route = $this->notFoundHandler;
+        }
+
+        $context = [
+          "REQUEST_PATH" => $path,
+        ];
+
+        $route($context);
+    }
+}
+
+return new Router();

templates/404.php

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+404 Not found

templates/maintenance.php

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+We are currently in maintenance mode.

utils/arrays.php

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+<?php
+
+function &array_get_or_add($needle, array &$haystack, $default=null) {
+    if (key_exists($needle, $haystack)) {
+        return $haystack[$needle];
+    } else {
+        $haystack[$needle] = $default;
+        return $haystack[$needle];
+    }
+}
+
+function array_default($needle, array $haystack, $default=null) {
+    if (key_exists($needle, $haystack)) {
+        return $haystack[$needle];
+    } else {
+        return $default;
+    }
+}