106 lines
2.8 KiB
PHP
106 lines
2.8 KiB
PHP
<?php
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declare(strict_types=1);
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namespace FastRoute\RouteParser;
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use FastRoute\BadRouteException;
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use FastRoute\RouteParser;
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use function count;
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use function preg_match;
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use function preg_match_all;
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use function preg_split;
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use function rtrim;
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use function strlen;
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use function substr;
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use function trim;
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use const PREG_OFFSET_CAPTURE;
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use const PREG_SET_ORDER;
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/**
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* Parses route strings of the following form:
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*
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* "/user/{name}[/{id:[0-9]+}]"
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*/
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class Std implements RouteParser
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{
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public const VARIABLE_REGEX = <<<'REGEX'
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\{
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\s* ([a-zA-Z_][a-zA-Z0-9_-]*) \s*
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(?:
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: \s* ([^{}]*(?:\{(?-1)\}[^{}]*)*)
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)?
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\}
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REGEX;
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public const DEFAULT_DISPATCH_REGEX = '[^/]+';
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/**
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* {@inheritDoc}
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*/
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public function parse(string $route): array
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{
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$routeWithoutClosingOptionals = rtrim($route, ']');
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$numOptionals = strlen($route) - strlen($routeWithoutClosingOptionals);
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// Split on [ while skipping placeholders
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$segments = preg_split('~' . self::VARIABLE_REGEX . '(*SKIP)(*F) | \[~x', $routeWithoutClosingOptionals);
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if ($numOptionals !== count($segments) - 1) {
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// If there are any ] in the middle of the route, throw a more specific error message
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if (preg_match('~' . self::VARIABLE_REGEX . '(*SKIP)(*F) | \]~x', $routeWithoutClosingOptionals)) {
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throw new BadRouteException('Optional segments can only occur at the end of a route');
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}
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throw new BadRouteException("Number of opening '[' and closing ']' does not match");
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}
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$currentRoute = '';
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$routeDatas = [];
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foreach ($segments as $n => $segment) {
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if ($segment === '' && $n !== 0) {
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throw new BadRouteException('Empty optional part');
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}
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$currentRoute .= $segment;
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$routeDatas[] = $this->parsePlaceholders($currentRoute);
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}
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return $routeDatas;
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}
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/**
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* Parses a route string that does not contain optional segments.
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*
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* @return mixed[]
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*/
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private function parsePlaceholders(string $route): array
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{
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if (! preg_match_all('~' . self::VARIABLE_REGEX . '~x', $route, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
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return [$route];
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}
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$offset = 0;
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$routeData = [];
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foreach ($matches as $set) {
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if ($set[0][1] > $offset) {
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$routeData[] = substr($route, $offset, $set[0][1] - $offset);
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}
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$routeData[] = [
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$set[1][0],
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isset($set[2]) ? trim($set[2][0]) : self::DEFAULT_DISPATCH_REGEX,
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];
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$offset = $set[0][1] + strlen($set[0][0]);
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}
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if ($offset !== strlen($route)) {
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$routeData[] = substr($route, $offset);
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}
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return $routeData;
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}
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}
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