<?php
\\FastRoute\RouteParser\Std;
 
class Std implements RouteParser
{
    const VARIABLE_REGEX = <<<'REGEX'
\{
    \s* ([a-zA-Z_][a-zA-Z0-9_-]*) \s*
    (?:
        : \s* ([^{}]*(?:\{(?-1)\}[^{}]*)*)
    )?
\}
REGEX;
    const DEFAULT_DISPATCH_REGEX = '[^/]+';
 
    public function parse($route)
    {
        $routeWithoutClosingOptionals = rtrim($route, ']');
 
        $numOptionals = strlen($route) - strlen($routeWithoutClosingOptionals);
 
        // Split on [ while skipping placeholders
        $segments = preg_split('~' . self::VARIABLE_REGEX . '(*SKIP)(*F) | \[~x', $routeWithoutClosingOptionals);
 
        if ($numOptionals !== count($segments) - 1) {
            // If there are any ] in the middle of the route, throw a more specific error message
            if (preg_match('~' . self::VARIABLE_REGEX . '(*SKIP)(*F) | \]~x', $routeWithoutClosingOptionals)) {
                throw new BadRouteException('Optional segments can only occur at the end of a route');
            }
            throw new BadRouteException("Number of opening '[' and closing ']' does not match");
        }
 
        $currentRoute = '';
        $routeDatas = [];
        foreach ($segments as $n => $segment) {
 
            if ($segment === '' && $n !== 0) {
                throw new BadRouteException('Empty optional part');
            }
 
            $currentRoute .= $segment;
            $routeDatas[] = $this->parsePlaceholders($currentRoute);
 
        }
 
        return $routeDatas;
    }
}

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