alexdodonov / mezon-router

UrlParser.php

<?php
namespace Mezon\Router;

trait UrlParser
{

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

    /**
     * Cache for regular expressions
     * 
     * @var array
     */
    private $cachedRegExps = [];

    /**
     * Method compiles route pattern string in regex string.
     * For example [i:id]/some-str in ([\[0-9\]])/some-str
     *
     * @param string $routerPattern
     *            router pattern
     * @return string regexp pattern
     */
    private function _getRouteMatcherRegExPattern(string $routerPattern): string
    {
        // try read from cache
        if (isset($this->cachedRegExps[$routerPattern])) {
            return $this->cachedRegExps[$routerPattern];
        }

        // parsing routes
        $compiledRouterPattern = $routerPattern;
        foreach ($this->types as $typeClass) {
            $compiledRouterPattern = preg_replace(
                '/' . $typeClass::searchRegExp() . '/',
                $typeClass::parserRegExp(),
                $compiledRouterPattern);
        }

        // final setup + save in cache
        $this->cachedRegExps[$routerPattern] = $compiledRouterPattern;

        // TODO and we need to store this cache while dumping
        return $compiledRouterPattern;
    }

    /**
     * Method returns all parameter names in the route
     *
     * @param string $routerPattern
     *            route
     * @return array names
     */
    private function _getParameterNames(string $routerPattern): array
    {
        $regExPattern = [];

        foreach (array_keys($this->types) as $typeName) {
            $regExPattern[] = $typeName;
        }

        $regExPattern = '\[(' . implode('|', $regExPattern) . '):([a-zA-Z0-9_\-]+)\]';

        $names = [];
        preg_match_all('/' . str_replace('/', '\\/', $regExPattern) . '/', $routerPattern, $names);

        $return = [];

        foreach ($names[2] as $name) {
            $return[] = $name;
        }

        // TODO cache this value
        return $return;
    }

    /**
     * Method searches dynamic route processor
     *
     * @param array $processors
     *            Callable router's processor
     * @param string $route
     *            Route
     * @return array|callable|bool route's handler or false in case the handler was not found
     */
    protected function getDynamicRouteProcessor(array &$processors, string $route)
    {
        $values = [];

        foreach ($processors as $pattern => $processor) {
            // may be it is tatic route?
            if (strpos($pattern, '[') === false) {
                // it is static route, so skip it
                continue;
            }

            $regExPattern = $this->_getRouteMatcherRegExPattern($pattern);

            // try match
            if (preg_match('/^' . str_replace('/', '\\/', $regExPattern) . '$/', $route, $values)) {
                // fetch parameter names
                $names = $this->_getParameterNames($pattern);

                $this->parameters = [];
                foreach ($names as $i => $name) {
                    $this->parameters[$name] = $values[$i + 1];
                }

                return $processor;
            }
        }

        // match was not found
        return false;
    }

    /**
     * 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)
    {
        $processor = $this->getDynamicRouteProcessor($processors, $route);

        if ($processor !== false) {
            return call_user_func($processor, $route, $this->parameters);

It seems like $processor can also be of type true; however, parameter $function of call_user_func() does only seem to accept callable, maybe add an additional type check?

        }

        return false;
    }

    /**
     * Checking that method exists
     *
     * @param mixed $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|callable $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;
    }

    /**
     * Method returns either universal hanler if it fits or normal handler
     *
     * @param array $processors
     *            list of routes and handlers
     * @param string $route
     *            calling route
     * @return mixed processor
     */
    protected function getExactRouteHandlerOrUniversal(&$processors, string $route)
    {
        if ($this->universalRouteWasAdded) {
            $allRoutes = array_keys($processors);

            if (array_search('*', $allRoutes) <= array_search($route, $allRoutes)) {
                $processor = $processors['*'];
            } else {
                $processor = $processors[$route];
            }
        } else {
            $processor = $processors[$route];
        }

        return $processor;
    }

    /**
     * Method executes route handler
     *
     * @param mixed $processor
     * @param string $route
     * @return mixed route handler execution result
     */
    protected function executeHandler($processor, string $route)
    {
        if ($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"));
            }
        }
    }

    /**
     * Method returns route handler
     *
     * @param mixed $processors
     *            Callable router's processor
     * @param string $route
     *            Route
     * @return array|callable|bool route handler
     */
    protected function getStaticRouteProcessor(&$processors, string $route)
    {
        if (isset($processors[$route])) {
            $processor = $this->getExactRouteHandlerOrUniversal($processors, $route);
        } elseif (isset($processors['*'])) {
            $processor = $processors['*'];
        } else {
            return false;
        }

        return $processor;
    }

    /**
     * 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)
    {
        $processor = $this->getStaticRouteProcessor($processors, $route);

        if ($processor === false) {
            return false;
        }

        return $this->executeHandler($processor, $route);
    }

    /**
     * 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]);
    }

    /**
     * Getting route by name
     *
     * @param string $routeName
     *            route's name
     * @return string route
     */
    public abstract function getRouteByName(string $routeName): string;

    /**
     * Compiling route into URL
     *
     * @param string $routeName
     *            route name
     * @param array $parameters
     *            parameters to use in URL
     * @return string compiled route
     */
    public function reverse(string $routeName, array $parameters = []): string
    {
        $route = $this->getRouteByName($routeName);

        foreach ($parameters as $name => $value) {
            $route = preg_replace('/\[([A-Za-z_\-])\:' . $name . ']/', $value, $route);
        }

        return $route;
    }
}