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<?php |
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namespace Teto\Routing; |
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use function ord; |
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use function strlen; |
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use function substr; |
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use function sprintf; |
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/** |
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* 共通接頭辞木構造を連想配列で実装したRouter |
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* |
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* @copyright 2015 Yusuke Koashi |
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* @license MIT |
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* @see https://gist.github.com/neo-nanikaka/c2e2f7742b311696d50b |
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* @see http://inside.pixiv.net/entry/2015/12/13/145741 |
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*/ |
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final class CommonPrefixTrieRouter |
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{ |
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const URL_PARAMETER_TYPE_NUM = '['; |
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const URL_PARAMETER_TYPE_STRING = ']'; |
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/** @var string ルーティングが存在するノードにおいて、値はこのキーで引く */ |
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private static $VALID_STATE_MARK = '>'; |
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/** @var string URLパラメータがあった場合、このキーで引く */ |
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private static $URL_PARAMETER_NAME = 'name'; |
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/** |
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* ルーティング決定のための探索を行う |
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* |
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* @param array $trie 指定の形式の連想配列 |
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* @param string $request_uri 解析したいURL |
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* @param string $http_method HTTPメソッド |
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* |
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* @return array [ |
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* 'value' => ルーティングの結果。値はなんでもよい |
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* 'params' => [ |
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* 'user_id' => '12345', // URLパラメータがあればその値を連想配列にする |
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* ] |
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* ] |
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*/ |
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public static function search($trie, $request_uri, $http_method) |
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{ |
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$p = $trie[$http_method]; |
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$length = strlen($request_uri); |
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$i = 0; |
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$ok = (0 < $length); // request_uriが空文字列だった場合にnullを返せるように |
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$result = []; // URLパラメータの値を記憶しておく変数 |
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while ($i < $length) { |
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if ($request_uri[$i] !== '/') { |
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$ok = false; |
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break; |
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} |
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$str = '' . $request_uri[$i++]; |
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$num_only = true; |
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while ($i < $length && $request_uri[$i] !== '/') { |
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$str .= $request_uri[$i]; |
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$x = ord($request_uri[$i]); |
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$num_only &= (48 <= $x && $x <= 57); |
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$i++; |
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} |
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if (isset($p[$str])) { |
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$p = $p[$str]; |
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} elseif ($num_only && isset($p[self::URL_PARAMETER_TYPE_NUM])) { |
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$p = $p[self::URL_PARAMETER_TYPE_NUM]; |
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$result[$p[self::$URL_PARAMETER_NAME]] = substr($str, 1); |
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} elseif (isset($p[self::URL_PARAMETER_TYPE_STRING])) { |
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$p = $p[self::URL_PARAMETER_TYPE_STRING]; |
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$result[$p[self::$URL_PARAMETER_NAME]] = substr($str, 1); |
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} else { |
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$ok = false; |
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break; |
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} |
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} |
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return $ok && isset($p[self::$VALID_STATE_MARK]) ? ['value' => $p[self::$VALID_STATE_MARK], 'params' => $result] |
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: null; |
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} |
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/** |
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* Trie木を表現した連想配列を構築する |
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* |
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* 動的に木を組み立てるために参照 & を多用している |
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* |
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* @param array $conf |
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* @return array |
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*/ |
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public static function trieConstruction(array $conf) |
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{ |
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$trie = []; |
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foreach ($conf as $con) { |
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$http_method = $con[0]; |
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$path = $con[1]; |
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$value = $con[2]; |
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$param_mapping = isset($con[3]) ? $con[3] : []; |
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if (!isset($trie[$http_method])) { |
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$trie[$http_method] = []; |
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} |
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$node = &$trie[$http_method]; |
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$path_length = strlen($path); |
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$i = 0; |
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while ($i < $path_length) { |
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if ($path[$i++] !== '/') { |
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throw new \Exception(sprintf("不正なパスが設定されています %s", $path)); |
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} |
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$partial_path = '/'; |
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while ($i < $path_length && $path[$i] !== '/') { |
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$partial_path .= $path[$i++]; |
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} |
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$is_url_parameter = false; |
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$url_param_name = null; |
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// URLパラメータだった場合 |
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if (1 < strlen($partial_path) && $partial_path[1] === ':') { |
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$is_url_parameter = true; |
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$url_param_name = substr($partial_path, 2); |
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if (!isset($param_mapping[$url_param_name])) { |
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throw new \Exception(sprintf("URLパラメータ :%s に対する設定が足りません", $url_param_name)); |
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} |
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$partial_path = $param_mapping[$url_param_name]; |
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} |
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if (!isset($node[$partial_path])) { |
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if ($is_url_parameter) { |
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$node[$partial_path] = [self::$URL_PARAMETER_NAME => $url_param_name]; |
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} else { |
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$node[$partial_path] = []; |
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} |
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} else { |
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if ($is_url_parameter && $node[$partial_path][self::$URL_PARAMETER_NAME] !== $url_param_name) { |
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throw new \Exception(sprintf("URLパラメータに別名をつけようとしています %s (:%s, :%s)", $path, $url_param_name, $node[$partial_path][self::$URL_PARAMETER_NAME])); |
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} |
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} |
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$node = &$node[$partial_path]; |
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} |
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if (isset($node[self::$VALID_STATE_MARK])) { |
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throw new \Exception(sprintf("重複したルーティングルールがあります %s", $path)); |
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} |
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$node[self::$VALID_STATE_MARK] = $value; |
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} |
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return $trie; |
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} |
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} |
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BaguettePHP /
TetoRouting
