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<?php namespace Comodojo\Dispatcher\Router; |
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use \Comodojo\Dispatcher\Router\Route; |
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use \Psr\Log\LoggerInterface; |
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use \Comodojo\Exception\DispatcherException; |
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use \Exception; |
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/** |
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* @package Comodojo Dispatcher |
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* @author Marco Giovinazzi <[email protected]> |
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* @author Marco Castiello <[email protected]> |
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* @license GPL-3.0+ |
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* |
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* LICENSE: |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as |
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* published by the Free Software Foundation, either version 3 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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class Parser { |
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public $logger; |
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public function __construct(LoggerInterface $logger) { |
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$this->logger = $logger; |
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} |
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// This method read the route (folder by folder recursively) and build |
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// the global regular expression against which all the request URI will be compared |
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public function read($folders = array(), Route $value = null, $regex = '') { |
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if (is_null($value)) { |
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$value = new Route(); |
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} |
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// if the first 'folder' is empty is removed |
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while (!empty($folders) && empty($folders[0])) { |
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array_shift($folders); |
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} |
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// if the 'folder' array is empty, the route has been fully analyzed |
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// this is the exit condition from the recursive loop. |
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if (empty($folders)) { |
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return '^'.$regex.'[\/]?$'; |
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} else { |
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// The first element of the array 'folders' is taken in order to be analyzed |
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$folder = array_shift($folders); |
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// All the parameters of the route must be json strings |
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$decoded = json_decode($folder, true); |
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if (!is_null($decoded) && is_array($decoded)) { |
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$param_regex = ''; |
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$param_required = false; |
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/* All the folders can include more than one parameter |
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* Eg: /service_name/{'param1': 'regex1', 'param2': 'regex2'}/ |
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* /calendar/{'ux_timestamp*': '\d{10}', 'microseconds': '\d{4}'}/ |
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* |
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* The '*' at the end of the paramerter name implies that the parameter is required |
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* This example can be read as a calendar service that accepts both |
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* timestamps in unix or javascript format. |
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* |
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* This is the reason of the following 'foreach' |
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*/ |
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foreach ($decoded as $key => $string) { |
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$this->logger->debug("Route parser - parameter key: $key"); |
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$this->logger->debug("Route parser - parameter string: $string"); |
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/* The key and the regex of every paramater is passed to the 'param' |
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* method which will build an appropriate regular expression and will understand |
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* if the parameter is required and will build the Route query object |
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*/ |
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$param_regex .= $this->param($key, $string, $value); |
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if ($value->isQueryRequired($key)) $param_required = true; |
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$this->logger->debug("Route parser - parameter regex: $param_regex"); |
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} |
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// Once the parameter is analyzed, the result is passed to the next iteration |
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return $this->read( |
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$folders, |
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$value, |
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$regex.'(?:\/'.$param_regex.')'. (($param_required)?'{1}':'?') |
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); |
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} else { |
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// if the element is not a json string, I assume it's the service name |
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$value->addService($folder); |
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return $this->read( |
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$folders, |
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$value, |
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$regex.'\/'.$folder |
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); |
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} |
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} |
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} |
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// This method read a single parameter and build the regular expression |
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private function param($key, $string, $value) { |
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$field_required = false; |
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// If the field name ends with a '*', the parameter is considered as required |
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if (preg_match('/^(.+)\*$/', $key, $bits)) { |
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$key = $bits[1]; |
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$field_required = true; |
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} |
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// The $value query object contains all regex which will be used by the collector to parse the route fields |
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$value->setQuery($key, $string, $field_required); |
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/* Every parameter can include it's own logic into the regular expression, |
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* it can use backreferences and it's expected to be used against a single parameter. |
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* This means that it can't be used as is to build the route regular expression, |
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* Backreferences are not useful at this point and can make the regular expression more time consuming |
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* and resource hungry. This is why they are replaced with the grouping parenthesis. |
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* Eg: (value) changes in (?:value) |
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* |
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* Delimiting characters like '^' and '$' are also meaningless in the complete regular expression and |
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* need to be removed. Contrariwise, wildcards must be delimited in order to keet the whole regular |
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* expression consistent, hence a '?' is added to all the '.*' or '.+' that don't already have one. |
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*/ |
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$string = preg_replace("/(?<!\\\\)\\((?!\\?)/", '(?:', $string); |
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$string = preg_replace("/\\.([\\*\\+])(?!\\?)/", '.${1}?', $string); |
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$string = preg_replace("/^[\\^]/", '', $string); |
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$string = preg_replace("/[\\$]$/", '', $string); |
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/* The produced regular expression is grouped and associated with its key (this means that the 'preg_match' |
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* function will generate an associative array where the key/value association is preserved). |
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* If the field is required, the regular expression is completed with a '{1}' (which make it compulsory), |
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* otherwise a '?' is added. |
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*/ |
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return '(?P<' . $key . '>' . $string . ')' . (($field_required)?'{1}':'?'); |
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} |
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} |
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comodojo /
dispatcher.framework
