From 6835db5e1fa88a2be9c0814a350a54bf93d61dc6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C5=91cze=20Bence?= <bence@pocze.ch>
Date: Sun, 31 May 2020 20:33:34 +0200
Subject: [PATCH] MAPG-86 add classes for routing

---
 src/Routing/Route.php           | 76 ++++++++++++++++++++++++++++++
 src/Routing/RouteCollection.php | 83 +++++++++++++++++++++++++++++++++
 2 files changed, 159 insertions(+)
 create mode 100644 src/Routing/Route.php
 create mode 100644 src/Routing/RouteCollection.php

diff --git a/src/Routing/Route.php b/src/Routing/Route.php
new file mode 100644
index 0000000..af5f659
--- /dev/null
+++ b/src/Routing/Route.php
@@ -0,0 +1,76 @@
+<?php namespace MapGuesser\Routing;
+
+class Route
+{
+    private string $id;
+
+    private array $pattern;
+
+    private array $handler;
+
+    public function __construct(string $id, array $pattern, array $handler)
+    {
+        $this->id = $id;
+        $this->pattern = $pattern;
+        $this->handler = $handler;
+    }
+
+    public function getId(): string
+    {
+        return $this->id;
+    }
+
+    public function generateLink(array $parameters = []): string
+    {
+        $link = [];
+
+        foreach ($this->pattern as $fragment) {
+            if (preg_match('/^{(\\w+)(\\?)?}$/', $fragment, $matches)) {
+                if (isset($parameters[$matches[1]])) {
+                    $link[] = $parameters[$matches[1]];
+                    unset($parameters[$matches[1]]);
+                } elseif (!isset($matches[2])) {//TODO: why? parameter not found but not optional
+                    $link[] = $fragment;
+                }
+            } else {
+                $link[] = $fragment;
+            }
+        }
+
+        $queryParams = [];
+        foreach ($parameters as $key => $value) {
+            if ($value === null) {
+                continue;
+            }
+
+            $queryParams[$key] = $value;
+        }
+
+        $query = count($queryParams) > 0 ? '?' . http_build_query($queryParams) : '';
+
+        return implode('/', $link) . $query;
+    }
+
+    public function callController(array $parameters)
+    {
+        $controllerName = $this->handler[0];
+        $controller = new $controllerName();
+
+        return call_user_func([$controller, $this->handler[1]], $parameters);
+    }
+
+    public function testAgainst(array $path): ?array
+    {
+        $parameters = [];
+
+        foreach ($path as $i => $fragment) {
+            if (preg_match('/^{(\\w+)(?:\\?)?}$/', $this->pattern[$i], $matches)) {
+                $parameters[$matches[1]] = $fragment;
+            } elseif ($fragment != $this->pattern[$i]) {
+                return null;
+            }
+        }
+
+        return $parameters;
+    }
+}
diff --git a/src/Routing/RouteCollection.php b/src/Routing/RouteCollection.php
new file mode 100644
index 0000000..c729c3e
--- /dev/null
+++ b/src/Routing/RouteCollection.php
@@ -0,0 +1,83 @@
+<?php namespace MapGuesser\Routing;
+
+use Closure;
+
+class RouteCollection
+{
+    private array $routes = [];
+
+    private array $searchTable = [
+        'get' => [],
+        'post' => []
+    ];
+
+    private array $groupStack = [];
+
+    public function get(string $id, string $pattern, array $handler): void
+    {
+        $this->addRoute('get', $id, $pattern, $handler);
+    }
+
+    public function post(string $id, string $pattern, array $handler): void
+    {
+        $this->addRoute('post', $id, $pattern, $handler);
+    }
+
+    public function group(string $pattern, Closure $group): void
+    {
+        $this->groupStack[] = $pattern;
+
+        $group($this);
+
+        array_pop($this->groupStack);
+    }
+
+    public function getRoute(string $id): ?Route
+    {
+        if (!isset($this->routes[$id])) {
+            return null;
+        }
+
+        return $this->routes[$id];
+    }
+
+    public function match(string $method, array $uri): ?array
+    {
+        $groupNumber = count($uri);
+
+        if (!isset($this->searchTable[$method][$groupNumber])) {
+            return null;
+        }
+
+        foreach ($this->searchTable[$method][$groupNumber] as $route) {
+            if (($parameters = $route->testAgainst($uri)) !== null) {
+                return [$route, $parameters];
+            }
+        }
+
+        return null;
+    }
+
+    private function addRoute(string $method, string $id, string $pattern, array $handler): void
+    {
+        if (isset($this->routes[$id])) {
+            throw new \Exception('Route already exists: ' . $id);
+        }
+
+        $pattern = array_merge($this->groupStack, explode('/', $pattern));
+        $route = new Route($id, $pattern, $handler);
+
+        $groupNumber = count($pattern);
+
+        $this->searchTable[$method][$groupNumber][] = $route;
+
+        while (preg_match('/^{\\w+\\?}$/', end($pattern))) {
+            $groupNumber--;
+            array_pop($pattern);
+
+            $this->searchTable[$method][$groupNumber][] = $route;
+        }
+
+        $this->routes[$id] = $route;
+    }
+}