68 lines
1.9 KiB
PHP
68 lines
1.9 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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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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// @return array{code: int, handler: callable, params: array|null }
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public function lookup(string $method, string $uri): array
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{
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// node is a reference to our current location in the node tree
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$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 = $node[':x'];
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continue;
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}
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// if we can't find a node for this segment, return 404
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return ['code' => 404];
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}
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// if we found a handler for the method, return it and any params. if not, return a 405
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return isset($node[$method])
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? ['code' => 200, 'handler' => $node[$method], 'params' => $params ?? null]
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: ['code' => 405];
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}
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public function clear(): Router
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{
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$this->routes = [];
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return $this;
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}
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}
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