Mezon\Router\UrlParser

Complexity

Total Complexity

38

Size/Duplication

Total Lines	298
Duplicated Lines	0 %

Importance

Changes	3
Bugs	0	Features	0

15 Methods

Rating	Name	Duplication	Size	Complexity
A	intHandler()	0	8	2
A	commandHandler()	0	7	2
A	intListHandler()	0	7	2
A	stringHandler()	0	5	1
A	__construct()	0	6	1
A	_matchRouteAndPattern()	0	29	6
A	methodDoesNotExists()	0	3	2
A	_matchParameterAndComponent()	0	12	3
A	findDynamicRouteProcessor()	0	13	3
A	canBeCalled()	0	4	3
A	isFunction()	0	3	2
A	routeFits()	0	3	2
A	hasParam()	0	3	1
A	findStaticRouteProcessor()	0	27	6
A	getParam()	0	7	2

<?php
namespace Mezon\Router;

class UrlParser
{

    /**
     * Supported types of URL parameters
     *
     * @var array
     */
    private $types = [];

    /**
     * Parsed parameters of the calling router
     *
     * @var array
     */
    protected $parameters = [];

    /**
     * Method handles integer type
     *
     * @param string $value
     *            value to be parsed
     * @return bool was the value parsed
     */
    public static function intHandler(string &$value): bool
    {
        if (is_numeric($value)) {
            $value = $value + 0;
            return true;
        }

        return false;
    }

    /**
     * Method handles command type
     *
     * @param string $value
     *            value to be parsed
     * @return bool was the value parsed
     */
    public static function commandHandler(string &$value): bool
    {
        if (preg_match('/^([a-z0-9A-Z_\/\-\.\@]+)$/', $value)) {
            return true;
        }

        return false;
    }

    /**
     * Method handles list of integers type
     *
     * @param string $value
     *            value to be parsed
     * @return bool was the value parsed
     */
    public static function intListHandler(string &$value): bool
    {
        if (preg_match('/^([0-9,]+)$/', $value)) {
            return true;
        }

        return false;
    }

    /**
     * Method handles string type
     *
     * @param string $value
     *            value to be parsed
     * @return bool was the value parsed
     */
    public static function stringHandler(string &$value): bool
    {
        $value = htmlspecialchars($value, ENT_QUOTES);

        return true;
    }

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->types['i'] = '\Mezon\Router\UrlParser::intHandler';
        $this->types['a'] = '\Mezon\Router\UrlParser::commandHandler';
        $this->types['il'] = '\Mezon\Router\UrlParser::intListHandler';
        $this->types['s'] = '\Mezon\Router\UrlParser::stringHandler';
    }

    /**
     * Matching parameter and component
     *
     * @param mixed $component
     *            Component of the URL
     * @param string $parameter
     *            Parameter to be matched
     * @return string Matched url parameter
     */
    private function _matchParameterAndComponent(&$component, string $parameter)
    {
        $parameterData = explode(':', trim($parameter, '[]'));

        if (isset($this->types[$parameterData[0]])) {
            if ($this->types[$parameterData[0]]($component)) {
                return $parameterData[1];
            } else {
                return '';
            }
        } else {
            throw (new \Exception('Unknown parameter type : ' . $parameterData[0]));
        }
    }

    /**
     * Method matches route and pattern
     *
     * @param array $cleanRoute
     *            Cleaned route splitted in parts
     * @param array $cleanPattern
     *            Route pattern
     * @return array|bool Array of route's parameters
     */
    private function _matchRouteAndPattern(array $cleanRoute, array $cleanPattern)
    {
        if (count($cleanRoute) !== count($cleanPattern)) {
            return false;
        }

        $paremeters = [];
        $patternsCount = count($cleanPattern);

        for ($i = 0; $i < $patternsCount; $i ++) {
            if (\Mezon\Router\Utils::isParameter($cleanPattern[$i])) {
                $parameterName = $this->_matchParameterAndComponent($cleanRoute[$i], $cleanPattern[$i]);

                // it's a parameter
                if ($parameterName !== '') {
                    // parameter was matched, store it!
                    $paremeters[$parameterName] = $cleanRoute[$i];
                } else {
                    return false;
                }
            } else {
                // it's a static part of the route
                if ($cleanRoute[$i] !== $cleanPattern[$i]) {
                    return false;
                }
            }
        }

        $this->parameters = $paremeters;
    }

    /**
     * Method searches dynamic route processor
     *
     * @param array $processors
     *            Callable router's processor
     * @param string $route
     *            Route
     * @return string|bool Result of the router'scall or false if any error occured
     */
    public function findDynamicRouteProcessor(array &$processors, string $route)
    {
        $cleanRoute = explode('/', trim($route, '/'));

        foreach ($processors as $i => $processor) {
            $cleanPattern = explode('/', trim($i, '/'));

            if ($this->_matchRouteAndPattern($cleanRoute, $cleanPattern) !== false) {
                return call_user_func($processor, $route, $this->parameters); // return result of the router
            }
        }

        return false;
    }

    /**
     * Checking that method exists
     *
     * @param object|array $processor
     *            callback object
     * @param ?string $functionName
     *            callback method
     * @return bool true if method does not exists
     */
    private function methodDoesNotExists($processor, ?string $functionName): bool
    {
        return isset($processor[0]) && method_exists($processor[0], $functionName) === false;
    }

    /**
     * Checking that handler can be called
     *
     * @param object|array $processor
     *            callback object
     * @param ?string $functionName
     *            callback method
     * @return bool
     */
    private function canBeCalled($processor, ?string $functionName): bool
    {
        return is_callable($processor) &&
            (method_exists($processor[0], $functionName) || isset($processor[0]->$functionName));
    }

    /**
     * Checking that processor can be called as function
     *
     * @param mixed $processor
     *            route processor
     * @return bool true if the $processor can be called as function
     */
    private function isFunction($processor): bool
    {
        return is_callable($processor) && is_array($processor) === false;
    }

    /**
     * Does the handler fits to route
     *
     * @param string $i
     *            handler
     * @param string $route
     *            route
     * @return bool true if the handler fits tto route
     */
    private function routeFits(string $i, string $route): bool
    {
        return $i == $route || $i == '/*/';
    }

    /**
     * Method searches route processor
     *
     * @param mixed $processors
     *            Callable router's processor
     * @param string $route
     *            Route
     * @return mixed Result of the router processor
     */
    public function findStaticRouteProcessor(&$processors, string $route)
    {
        foreach ($processors as $i => $processor) {
            // exact router or 'all router'
            if ($this->routeFits($i, $route)) {
                if ($this->isFunction($processor)) {
                    return $processor($route, []);
                }

                $functionName = $processor[1] ?? null;

                if ($this->canBeCalled($processor, $functionName)) {
                    // passing route path and parameters
                    return call_user_func($processor, $route, []);
                } else {
                    $callableDescription = \Mezon\Router\Utils::getCallableDescription($processor);

                    if ($this->methodDoesNotExists($processor, $functionName)) {
                        throw (new \Exception("'$callableDescription' does not exists"));
                    } else {
                        throw (new \Exception("'$callableDescription' must be callable entity"));
                    }
                }
            }
        }

        return false;
    }

    /**
     * Method returns route parameter
     *
     * @param string $name
     *            Route parameter
     * @return string Route parameter
     */
    public function getParam(string $name): string
    {
        if (isset($this->parameters[$name]) === false) {
            throw (new \Exception('Parameter ' . $name . ' was not found in route', - 1));
        }

        return $this->parameters[$name];
    }

    /**
     * Does parameter exists
     *
     * @param string $name
     *            Param name
     * @return bool True if the parameter exists
     */
    public function hasParam(string $name): bool
    {
        return isset($this->parameters[$name]);
    }
}