<?php
namespace FastRoute\RouteParser;
use FastRoute\BadRouteException;
use FastRoute\RouteParser;
/**
* Parses route strings of the following form:
*
* "/user/{name}[/{id:[0-9]+}]"
*/
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 $routeDatas;
}
/**
* Parses a route string that does not contain optional segments.
*
* @param string
* @return mixed[]
*/
private function parsePlaceholders($route)
{
if (!preg_match_all(
'~' . self::VARIABLE_REGEX . '~x', $route, $matches,
PREG_OFFSET_CAPTURE | PREG_SET_ORDER
)) {
return [$route];
}
$offset = 0;
$routeData = [];
foreach ($matches as $set) {
if ($set[0][1] > $offset) {
$routeData[] = substr($route, $offset, $set[0][1] - $offset);
}
$routeData[] = [
$set[1][0],
isset($set[2]) ? trim($set[2][0]) : self::DEFAULT_DISPATCH_REGEX
];
$offset = $set[0][1] + strlen($set[0][0]);
}
if ($offset !== strlen($route)) {
$routeData[] = substr($route, $offset);
}
return $routeData;
}
}