80 lines
2.4 KiB
PHP
80 lines
2.4 KiB
PHP
<?php
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class SegmentRouter implements Router
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{
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public array $routes = [];
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/**
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* Add a route to the router. The route can contain dynamic segments, which are denoted by a colon. They are
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* inserted into the node tree per segment; if a segment is dynamic, it is stored under the key ':x'.
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*/
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public function add(string $method, string $route, callable $handler): Router
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{
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// Expand the route into segments and make dynamic segments into a common placeholder
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$segments = array_map(function($segment) {
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return str_starts_with($segment, ':') ? ':x' : $segment;
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}, explode('/', trim($route, '/')));
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// Push each segment into the routes array as a node, except if this is the root node
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$node = &$this->routes;
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foreach ($segments as $segment) {
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// skip an empty segment, which allows us to register handlers for the root node
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if ($segment === '') continue;
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$node = &$node[$segment]; // build the node tree as we go
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}
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// Add the handler to the last node
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$node[$method] = $handler;
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return $this;
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}
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/**
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* Lookup a route in the router. This method will return the handler for the route if it is found, or a 404 or 405
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* status code if the route is not found or the method is not allowed. If the route contains dynamic segments, the
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* method will return an array with the handler and the dynamic segments.
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*
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* @return [callable, array] | int
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*/
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public function lookup(string $method, string $uri): int|array
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{
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// node is a reference to our current location in the node tree
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$node = $this->routes;
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// params will hold any dynamic segments we find
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$params = [];
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// We'll split up the URI into segments and traverse the node tree
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foreach (explode('/', trim($uri, '/')) as $segment) {
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// if there is a node for this segment, move to it
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if (isset($node[$segment])) {
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$node = $node[$segment];
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continue;
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}
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// if there is a dynamic segment, move to it and store the value
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if (isset($node[':x'])) {
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$params[] = $segment;
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$node = $node[':x'];
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continue;
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}
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// if we can't find a node for this segment, return 404
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return 404;
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}
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// if we fail to find a handler for the method, return 405
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if (!isset($node[$method])) return 405;
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// return the handler and any dynamic segments we found
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return [$node[$method], $params];
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}
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public function clear(): Router
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{
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$this->routes = [];
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return $this;
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}
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}
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