GIF89a=( õ' 7IAXKgNgYvYx\%wh…hŽth%ˆs%—x¨}9®Œ©€&©‰%¶†(¹–.¹5·œD¹&Çš)ÇŸ5ǘ;Í£*È¡&Õ²)ׯ7×µ<Ñ»4ï°3ø‘HÖ§KͯT÷¨Yÿšqÿ»qÿÔFØ !ù ' !ÿ NETSCAPE2.0 , =( þÀ“pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§gª«ªE¯°¨¬ª±²Œ¹º¹E¾­”´ÂB¶¯ §Åȸ»ÑD¾¿Á•ÄÅ®° ÝH¾ÒLÀÆDÙ«D¶BÝïðÀ¾DÑÑÔTÌÍíH òGö¨A RÎڐ |¥ ٭&ºìE8œ¹kGÔAÞpx­a¶­ã R2XB®åE8I€Õ6Xî:vT)äžþÀq¦è³¥ì仕F~%xñ  4#ZÔ‰O|-4Bs‘X:= QÉ œš lºÒyXJŠGȦ|s hÏíK–3l7·B|¥$'7Jީܪ‰‡àá”Dæn=Pƒ ¤Òëí‰`䌨ljóá¯Éüv>á–Á¼5 ½.69ûϸd«­ºÀûnlv©‹ªîf{¬ÜãPbŸ  l5‘Ž¯pß ´ ˜3aÅùäI«O’ý·‘áÞ‡˜¾Æ‚ÙÏiÇÿ‹Àƒ #öó)pâš Þ½ ‘Ý{ó)vmÞü%D~ 6f s}ŃƒDØW Eþ`‡þ À…L8xá†ç˜{)x`X/> Ì}mø‚–RØ‘*|`D=‚Ø_ ^ð5 !_…'aä“OÚ—7âcð`D”Cx`ÝÂ¥ä‹éY¹—F¼¤¥Š?¡Õ™ n@`} lď’ÄÉ@4>ñd œ à‘vÒxNÃ×™@žd=ˆgsžG±æ ´²æud &p8Qñ)ˆ«lXD©øÜéAžHìySun jª×k*D¤LH] †¦§C™Jä–´Xb~ʪwStŽ6K,°£qÁœ:9ت:¨þªl¨@¡`‚ûÚ ».Û¬¯t‹ÆSÉ[:°=Š‹„‘Nåû”Ìî{¿ÂA ‡Rà›ÀÙ6úë°Ÿð0Ä_ ½;ÃϱîÉì^ÇÛÇ#Ëë¼ôº!±Ä˜íUîÅÇ;0L1óÁµö«p% AÀºU̬ݵ¼á%霼€‡¯Á~`ÏG¯»À× ­²± =4ªnpð3¾¤³¯­ü¾¦îuÙuµÙ®|%2ÊIÿür¦#0·ÔJ``8È@S@5ê¢ ö×Þ^`8EÜ]ý.뜃Âç 7 ú ȉÞj œ½Dç zý¸iþœÑÙûÄë!ˆÞÀl§Ïw‹*DçI€nEX¯¬¼ &A¬Go¼QföõFç°¯;é¦÷îŽêJ°îúôF5¡ÌQ|îúöXªæ»TÁÏyñêï]ê² o óÎC=öõ›ÒÓPB@ D×½œä(>èCÂxŽ`±«Ÿ–JЀ»Û á¤±p+eE0`ëŽ`A Ú/NE€Ø†À9‚@¤à H½7”à‡%B‰`Àl*ƒó‘–‡8 2ñ%¸ —€:Ù1Á‰E¸àux%nP1ð!‘ðC)¾P81lÑɸF#ˆ€{´âé°ÈB„0>±û °b¡Š´±O‚3È–Ù()yRpbµ¨E.Z‘D8ÊH@% òŒx+%Ù˜Æcü »¸˜fõ¬b·d`Fê™8èXH"ÉÈ-±|1Ô6iI, 2““¬$+](A*jÐ QTÂo‰.ÛU슬Œã„Ž`¯SN¡–¶Äåyše¯ª’­¬‚´b¦Éož œ)åyâ@Ì®3 ÎtT̉°&Ø+žLÀf"Ø-|žçÔ>‡Ðv¦Ðžì\‚ Q1)Ž@Žh#aP72”ˆ™¨$‚ !ù " , =( …7IAXG]KgNgYvYxR"k\%w]'}hŽth%ˆg+ˆs%—r.—m3šx3˜x¨}9®€&©€+¨‡7§‰%¶†(¹–.¹œD¹&ǘ;Í•&ײ)×»4ïÌ6ò§KÍ þ@‘pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g «¬ E ±± ¨­¶°ººE Á´”·®C¬²§Ç¶Œ»ÓDÃÕƷ¯Ê±H½ºM×ÁGÚ¬D¶BËÁ½î½DÓôTÏÛßîG»ôõC×CÌ l&âž:'òtU³6ɹ#·Ø)€'Ü.6±&ëÍÈ» K(8p0N?!æ2"ÛˆNIJX>R¼ÐO‚M '¡¨2¸*Ÿþ>#n↠å@‚<[:¡Iïf’ ¤TÚ˘CdbÜÙ“[«ŽEú5MBo¤×@€`@„€Êt W-3 ¶Ÿ¡BíêäjIÝ…Eò9[T…$íêﯧ„…•s»Óȳ¹€ÅÚdc®UUρ#±Ùïldj?´í¼²`\ŽÁðÞu|3'ÖŒ]ë6 ¶S#²‡˜FKLÈ *N E´‘áäŠ$˜›eÄYD„ºq«.è촁ƒs \-ÔjA 9²õ÷å- üúM[Âx(ís÷ì®x€|í¡Ù’p¦‚ ŽkÛTÇDpE@WÜ ²Ç]kŠ1¨ þ€·Yb ÓÁ‰l°*n0 ç™—žzBdОu¾7ĉBl€â‰-ºx~|UåU‰  h*Hœ|e"#"?vpÄiŠe6^ˆ„+qâŠm8 #VÇá ‘å–ÄV„œ|Šè•m"сœn|@›U¶ÆΞ—Špb¥G¨ED”€±Úê2FÌIç? >Éxå Œ± ¡¤„%‘žjŸ‘ꄯ<Ìaà9ijÐ2˜D¦È&›†Z`‚å]wþ¼Â:ç6àB¤7eFJ|õÒ§Õ,¨äàFÇ®cS·Ê¶+B°,‘Þ˜ºNûãØ>PADÌHD¹æž«ÄÀnÌ¥}­#Ë’ë QÀÉSÌÂÇ2ÌXÀ{æk²lQÁ2«ÊðÀ¯w|2Í h‹ÄÂG€,m¾¶ë3ÐÙ6-´ÅE¬L°ÆIij*K½ÀÇqï`DwVÍQXœÚÔpeœ±¬Ñ q˜§Tœ½µƒ°Œìu Â<¶aØ*At¯lmEØ ü ôÛN[P1ÔÛ¦­±$ÜÆ@`ùåDpy¶yXvCAyåB`ŽD¶ 0QwG#¯ æš[^Äþ $ÀÓÝǦ{„L™[±úKÄgÌ;ï£S~¹ìGX.ôgoT.»åˆ°ùŸûù¡?1zö¦Ÿž:ÅgÁ|ìL¹ „®£œŠ‚à0œ]PÁ^p F<"•ç?!,ñ‡N4—…PÄ Á„ö¨Û:Tè@hÀ‹%táÿ:ø-žI<`þ‹p I….)^ 40D#p@ƒj4–؀:²‰1Øâr˜¼F2oW¼#Z†;$Q q” ‘ ÂK¦ñNl#29 !’F@¥Bh·ᏀL!—XFóLH‘Kh¤.«hE&JòG¨¥<™WN!€ÑÙÚˆY„@†>Œž19J" 2,/ &.GXB%ÌRÈ9B6¹W]’î×ÔW¥’IÎ$ ñ‹ÓŒE8YÆ ¼³™ñA5“à®Q.aŸB€&Ø©³ JÁ—! ¦t)K%tœ-¦JF bòNMxLôþ)ÐR¸Ð™‘ èÝ6‘O!THÌ„HÛ ‰ !ù ) , =( …AXKgNgYvYxR"k\%wh…hŽh%ˆg+ˆs%—r.—x3˜x¨}9®€&©€+¨Œ,©‡7§‰%¶†(¹–.¹5·&Çš)ǘ;Í•&×£*Ȳ)ׯ7×»4ï°3øÌ6ò‘HÖ§KÍ»Hó¯T÷¨Yÿ»qÿÇhÿ þÀ”pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g ª« E$±²¨ª­ · °²½$E$ÂÕ««D· Í ¿¦Ç¶¸ÌŒ¾³CÃÅÆ E ééH½MÛÂGâªD­ çBêêϾD²ÒaÀà€Š1r­ðÓ¤ ÔožzU!L˜C'¾yW½UGtäÇïÙllê0×àÂuGþ)AÀs[þ·xì ÁxO%ƒûX2ó—  P£n›R/¡ÑšHše+êDm?# —‘Ç£6¡8íJ¡ŸâDiäªM¥Ö„ôj“¬¹£5oQ7°- <‡ *´lãÓŒ2r/a!l)dÈ A™ÈE¢ôÔ͆…ð ;Ö˜c ¡%ß‚’Ùˆâ¸b½—pe~C"BíëÚHïeF2§æŠ8qb t_`urŠeü wÅu3êæPv§h•"ß`íÍxçLĹÜÖ3á  ~Öº“®›¸ÏMDfJÙ °„ÛµáWõ%§œ‚à©–‚X Ó؁)@®Ñ›Eþ´wëuÅSxb8y\mÖzœ¥§ZbºE—ÂLªÌw!y(>¡™wú=Ç|ÅÝs¢d €CÁW)HÜcC$€L Ä7„r.á\{)@ð` @ äXÈ$PD” `šaG:§æˆOˆ72EÐamn]ù"ŒcÊxÑŒ° &dR8`g«iÙŸLR!¦P …d’ä¡“¦ðÎTƒ¦ià|À _ ¥ Qi#¦Šg›Æ ›noMµ ›V ã£)p ç£ÎW…š=Âeªk§†j„ ´®1ß²sÉxéW«jšl|0¯B0Û, \jÛ´›6±¬¶C ÛíWþï|ëÙ‹¸ñzĸV {ì;Ýñn¼òVˆm³I¼³.Ðã¤PN¥ ²µ¼„µCã+¹ÍByî£Ñ¾HŸ›ëê 7ìYÆFTk¨SaoaY$Dµœìï¿Ã29RÈkt Çïfñ ÇÒ:ÀÐSp¹3ÇI¨â¥DZÄ ü9Ïýögñ½­uÔ*3)O‘˜Ö[_hv ,àî×Et Ÿé¶BH€ Õ[ü±64M@ÔSÌM7dÐl5-ÄÙU܍´©zߌ3Ô€3ž„ „ ¶ÛPô½5×g› êÚ˜kN„Ý…0Îj4€Ìë°“#{þÕ3S2çKÜ'ợlø¼Ú2K{° {Û¶?žm𸧠ËI¼nEò='êüóºè^üæÃ_Û=°óž‚ì#Oý¿Í'¡½áo..ÏYìnüñCœO±Áa¿¢Kô½o,üÄËbö²çºíï{ËC Ú— "”Ï{ËK ÍÒw„õ±Oz dÕ¨à:$ ƒô—«v»] A#ð «€¿šéz)Rx׿ˆ¥‚d``èw-îyÏf×K!ð€þ­Ð|ìPľ„=Ì`ý(f” 'Pa ¥ÐBJa%Ðâf§„%Š¡}FàáÝ×6>ÉäŠG"éŽè=ø!oŠ°^FP¼Ø©Q„ÀCÙÁ`(Ž\ÄÝ® ©Â$<n@dÄ E#ììUÒI! ‚#lù‹`k¦ÐÇ'Rró’ZýNBÈMF Í[¤+‹ðɈ-áwj¨¥þ8¾rá ,VÂh„"|½œ=×G_¦Ñ™EØ 0i*%̲˜Æda0mV‚k¾)›;„&6 p>ÓjK “¦Ç# âDÂ:ûc?:R Ó¬fÞéI-Ì“•Ã<ä=™Ï7˜3œ¨˜c2ŒW ,ˆ”8(T™P‰F¡Jhç"‚ ; 403WebShell
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Current File : /opt/alt/php53/usr/share/pear/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php
<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Routing\Matcher\Dumper;

use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\ExpressionLanguage\ExpressionLanguage;

/**
 * PhpMatcherDumper creates a PHP class able to match URLs for a given set of routes.
 *
 * @author Fabien Potencier <[email protected]>
 * @author Tobias Schultze <http://tobion.de>
 * @author Arnaud Le Blanc <[email protected]>
 */
class PhpMatcherDumper extends MatcherDumper
{
    private $expressionLanguage;

    /**
     * Dumps a set of routes to a PHP class.
     *
     * Available options:
     *
     *  * class:      The class name
     *  * base_class: The base class name
     *
     * @param array $options An array of options
     *
     * @return string A PHP class representing the matcher class
     */
    public function dump(array $options = array())
    {
        $options = array_replace(array(
            'class'      => 'ProjectUrlMatcher',
            'base_class' => 'Symfony\\Component\\Routing\\Matcher\\UrlMatcher',
        ), $options);

        // trailing slash support is only enabled if we know how to redirect the user
        $interfaces = class_implements($options['base_class']);
        $supportsRedirections = isset($interfaces['Symfony\\Component\\Routing\\Matcher\\RedirectableUrlMatcherInterface']);

        return <<<EOF
<?php

use Symfony\Component\Routing\Exception\MethodNotAllowedException;
use Symfony\Component\Routing\Exception\ResourceNotFoundException;
use Symfony\Component\Routing\RequestContext;

/**
 * {$options['class']}
 *
 * This class has been auto-generated
 * by the Symfony Routing Component.
 */
class {$options['class']} extends {$options['base_class']}
{
    /**
     * Constructor.
     */
    public function __construct(RequestContext \$context)
    {
        \$this->context = \$context;
    }

{$this->generateMatchMethod($supportsRedirections)}
}

EOF;
    }

    /**
     * Generates the code for the match method implementing UrlMatcherInterface.
     *
     * @param Boolean $supportsRedirections Whether redirections are supported by the base class
     *
     * @return string Match method as PHP code
     */
    private function generateMatchMethod($supportsRedirections)
    {
        $code = rtrim($this->compileRoutes($this->getRoutes(), $supportsRedirections), "\n");

        return <<<EOF
    public function match(\$pathinfo)
    {
        \$allow = array();
        \$pathinfo = rawurldecode(\$pathinfo);
        \$context = \$this->context;
        \$request = \$this->request;

$code

        throw 0 < count(\$allow) ? new MethodNotAllowedException(array_unique(\$allow)) : new ResourceNotFoundException();
    }
EOF;
    }

    /**
     * Generates PHP code to match a RouteCollection with all its routes.
     *
     * @param RouteCollection $routes               A RouteCollection instance
     * @param Boolean         $supportsRedirections Whether redirections are supported by the base class
     *
     * @return string PHP code
     */
    private function compileRoutes(RouteCollection $routes, $supportsRedirections)
    {
        $fetchedHost = false;

        $groups = $this->groupRoutesByHostRegex($routes);
        $code = '';

        foreach ($groups as $collection) {
            if (null !== $regex = $collection->getAttribute('host_regex')) {
                if (!$fetchedHost) {
                    $code .= "        \$host = \$this->context->getHost();\n\n";
                    $fetchedHost = true;
                }

                $code .= sprintf("        if (preg_match(%s, \$host, \$hostMatches)) {\n", var_export($regex, true));
            }

            $tree = $this->buildPrefixTree($collection);
            $groupCode = $this->compilePrefixRoutes($tree, $supportsRedirections);

            if (null !== $regex) {
                // apply extra indention at each line (except empty ones)
                $groupCode = preg_replace('/^.{2,}$/m', '    $0', $groupCode);
                $code .= $groupCode;
                $code .= "        }\n\n";
            } else {
                $code .= $groupCode;
            }
        }

        return $code;
    }

    /**
     * Generates PHP code recursively to match a tree of routes
     *
     * @param DumperPrefixCollection $collection           A DumperPrefixCollection instance
     * @param Boolean                $supportsRedirections Whether redirections are supported by the base class
     * @param string                 $parentPrefix         Prefix of the parent collection
     *
     * @return string PHP code
     */
    private function compilePrefixRoutes(DumperPrefixCollection $collection, $supportsRedirections, $parentPrefix = '')
    {
        $code = '';
        $prefix = $collection->getPrefix();
        $optimizable = 1 < strlen($prefix) && 1 < count($collection->all());
        $optimizedPrefix = $parentPrefix;

        if ($optimizable) {
            $optimizedPrefix = $prefix;

            $code .= sprintf("    if (0 === strpos(\$pathinfo, %s)) {\n", var_export($prefix, true));
        }

        foreach ($collection as $route) {
            if ($route instanceof DumperCollection) {
                $code .= $this->compilePrefixRoutes($route, $supportsRedirections, $optimizedPrefix);
            } else {
                $code .= $this->compileRoute($route->getRoute(), $route->getName(), $supportsRedirections, $optimizedPrefix)."\n";
            }
        }

        if ($optimizable) {
            $code .= "    }\n\n";
            // apply extra indention at each line (except empty ones)
            $code = preg_replace('/^.{2,}$/m', '    $0', $code);
        }

        return $code;
    }

    /**
     * Compiles a single Route to PHP code used to match it against the path info.
     *
     * @param Route       $route                A Route instance
     * @param string      $name                 The name of the Route
     * @param Boolean     $supportsRedirections Whether redirections are supported by the base class
     * @param string|null $parentPrefix         The prefix of the parent collection used to optimize the code
     *
     * @return string PHP code
     *
     * @throws \LogicException
     */
    private function compileRoute(Route $route, $name, $supportsRedirections, $parentPrefix = null)
    {
        $code = '';
        $compiledRoute = $route->compile();
        $conditions = array();
        $hasTrailingSlash = false;
        $matches = false;
        $hostMatches = false;
        $methods = array();

        if ($req = $route->getRequirement('_method')) {
            $methods = explode('|', strtoupper($req));
            // GET and HEAD are equivalent
            if (in_array('GET', $methods) && !in_array('HEAD', $methods)) {
                $methods[] = 'HEAD';
            }
        }

        $supportsTrailingSlash = $supportsRedirections && (!$methods || in_array('HEAD', $methods));

        if (!count($compiledRoute->getPathVariables()) && false !== preg_match('#^(.)\^(?P<url>.*?)\$\1#', $compiledRoute->getRegex(), $m)) {
            if ($supportsTrailingSlash && substr($m['url'], -1) === '/') {
                $conditions[] = sprintf("rtrim(\$pathinfo, '/') === %s", var_export(rtrim(str_replace('\\', '', $m['url']), '/'), true));
                $hasTrailingSlash = true;
            } else {
                $conditions[] = sprintf("\$pathinfo === %s", var_export(str_replace('\\', '', $m['url']), true));
            }
        } else {
            if ($compiledRoute->getStaticPrefix() && $compiledRoute->getStaticPrefix() !== $parentPrefix) {
                $conditions[] = sprintf("0 === strpos(\$pathinfo, %s)", var_export($compiledRoute->getStaticPrefix(), true));
            }

            $regex = $compiledRoute->getRegex();
            if ($supportsTrailingSlash && $pos = strpos($regex, '/$')) {
                $regex = substr($regex, 0, $pos).'/?$'.substr($regex, $pos + 2);
                $hasTrailingSlash = true;
            }
            $conditions[] = sprintf("preg_match(%s, \$pathinfo, \$matches)", var_export($regex, true));

            $matches = true;
        }

        if ($compiledRoute->getHostVariables()) {
            $hostMatches = true;
        }

        if ($route->getCondition()) {
            $conditions[] = $this->getExpressionLanguage()->compile($route->getCondition(), array('context', 'request'));
        }

        $conditions = implode(' && ', $conditions);

        $code .= <<<EOF
        // $name
        if ($conditions) {

EOF;

        $gotoname = 'not_'.preg_replace('/[^A-Za-z0-9_]/', '', $name);
        if ($methods) {
            if (1 === count($methods)) {
                $code .= <<<EOF
            if (\$this->context->getMethod() != '$methods[0]') {
                \$allow[] = '$methods[0]';
                goto $gotoname;
            }


EOF;
            } else {
                $methods = implode("', '", $methods);
                $code .= <<<EOF
            if (!in_array(\$this->context->getMethod(), array('$methods'))) {
                \$allow = array_merge(\$allow, array('$methods'));
                goto $gotoname;
            }


EOF;
            }
        }

        if ($hasTrailingSlash) {
            $code .= <<<EOF
            if (substr(\$pathinfo, -1) !== '/') {
                return \$this->redirect(\$pathinfo.'/', '$name');
            }


EOF;
        }

        if ($scheme = $route->getRequirement('_scheme')) {
            if (!$supportsRedirections) {
                throw new \LogicException('The "_scheme" requirement is only supported for URL matchers that implement RedirectableUrlMatcherInterface.');
            }

            $code .= <<<EOF
            if (\$this->context->getScheme() !== '$scheme') {
                return \$this->redirect(\$pathinfo, '$name', '$scheme');
            }


EOF;
        }

        // optimize parameters array
        if ($matches || $hostMatches) {
            $vars = array();
            if ($hostMatches) {
                $vars[] = '$hostMatches';
            }
            if ($matches) {
                $vars[] = '$matches';
            }
            $vars[] = "array('_route' => '$name')";

            $code .= sprintf("            return \$this->mergeDefaults(array_replace(%s), %s);\n"
                , implode(', ', $vars), str_replace("\n", '', var_export($route->getDefaults(), true)));

        } elseif ($route->getDefaults()) {
            $code .= sprintf("            return %s;\n", str_replace("\n", '', var_export(array_replace($route->getDefaults(), array('_route' => $name)), true)));
        } else {
            $code .= sprintf("            return array('_route' => '%s');\n", $name);
        }
        $code .= "        }\n";

        if ($methods) {
            $code .= "        $gotoname:\n";
        }

        return $code;
    }

    /**
     * Groups consecutive routes having the same host regex.
     *
     * The result is a collection of collections of routes having the same host regex.
     *
     * @param RouteCollection $routes A flat RouteCollection
     *
     * @return DumperCollection A collection with routes grouped by host regex in sub-collections
     */
    private function groupRoutesByHostRegex(RouteCollection $routes)
    {
        $groups = new DumperCollection();

        $currentGroup = new DumperCollection();
        $currentGroup->setAttribute('host_regex', null);
        $groups->add($currentGroup);

        foreach ($routes as $name => $route) {
            $hostRegex = $route->compile()->getHostRegex();
            if ($currentGroup->getAttribute('host_regex') !== $hostRegex) {
                $currentGroup = new DumperCollection();
                $currentGroup->setAttribute('host_regex', $hostRegex);
                $groups->add($currentGroup);
            }
            $currentGroup->add(new DumperRoute($name, $route));
        }

        return $groups;
    }

    /**
     * Organizes the routes into a prefix tree.
     *
     * Routes order is preserved such that traversing the tree will traverse the
     * routes in the origin order.
     *
     * @param DumperCollection $collection A collection of routes
     *
     * @return DumperPrefixCollection
     */
    private function buildPrefixTree(DumperCollection $collection)
    {
        $tree = new DumperPrefixCollection();
        $current = $tree;

        foreach ($collection as $route) {
            $current = $current->addPrefixRoute($route);
        }

        $tree->mergeSlashNodes();

        return $tree;
    }

    private function getExpressionLanguage()
    {
        if (null === $this->expressionLanguage) {
            if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
                throw new \RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
            }
            $this->expressionLanguage = new ExpressionLanguage();
        }

        return $this->expressionLanguage;
    }
}

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