212 lines
5.8 KiB
PHP
212 lines
5.8 KiB
PHP
<?php
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declare(strict_types=1);
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namespace FastRoute\DataGenerator;
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use FastRoute\BadRouteException;
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use FastRoute\DataGenerator;
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use FastRoute\Route;
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use function array_chunk;
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use function array_map;
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use function ceil;
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use function count;
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use function is_string;
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use function max;
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use function preg_match;
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use function preg_quote;
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use function round;
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use function sprintf;
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use function strpos;
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abstract class RegexBasedAbstract implements DataGenerator
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{
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/** @var mixed[][] */
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protected $staticRoutes = [];
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/** @var Route[][] */
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protected $methodToRegexToRoutesMap = [];
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abstract protected function getApproxChunkSize(): int;
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/**
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* @param array<string, Route> $regexToRoutesMap
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*
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* @return mixed[]
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*/
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abstract protected function processChunk(array $regexToRoutesMap): array;
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/**
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* {@inheritDoc}
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*/
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public function addRoute(string $httpMethod, array $routeData, $handler): void
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{
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if ($this->isStaticRoute($routeData)) {
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$this->addStaticRoute($httpMethod, $routeData, $handler);
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} else {
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$this->addVariableRoute($httpMethod, $routeData, $handler);
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}
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}
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/**
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* {@inheritDoc}
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*/
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public function getData(): array
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{
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if ($this->methodToRegexToRoutesMap === []) {
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return [$this->staticRoutes, []];
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}
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return [$this->staticRoutes, $this->generateVariableRouteData()];
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}
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/**
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* @return mixed[]
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*/
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private function generateVariableRouteData(): array
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{
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$data = [];
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foreach ($this->methodToRegexToRoutesMap as $method => $regexToRoutesMap) {
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$chunkSize = $this->computeChunkSize(count($regexToRoutesMap));
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$chunks = array_chunk($regexToRoutesMap, $chunkSize, true);
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$data[$method] = array_map([$this, 'processChunk'], $chunks);
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}
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return $data;
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}
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private function computeChunkSize(int $count): int
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{
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$numParts = max(1, round($count / $this->getApproxChunkSize()));
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return (int) ceil($count / $numParts);
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}
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/**
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* @param array<int, mixed> $routeData
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*/
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private function isStaticRoute(array $routeData): bool
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{
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return count($routeData) === 1 && is_string($routeData[0]);
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}
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/**
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* @param array<int, mixed> $routeData
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* @param mixed $handler
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*/
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private function addStaticRoute(string $httpMethod, array $routeData, $handler): void
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{
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$routeStr = $routeData[0];
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if (isset($this->staticRoutes[$httpMethod][$routeStr])) {
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throw new BadRouteException(sprintf(
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'Cannot register two routes matching "%s" for method "%s"',
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$routeStr,
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$httpMethod
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));
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}
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if (isset($this->methodToRegexToRoutesMap[$httpMethod])) {
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foreach ($this->methodToRegexToRoutesMap[$httpMethod] as $route) {
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if ($route->matches($routeStr)) {
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throw new BadRouteException(sprintf(
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'Static route "%s" is shadowed by previously defined variable route "%s" for method "%s"',
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$routeStr,
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$route->regex,
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$httpMethod
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));
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}
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}
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}
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$this->staticRoutes[$httpMethod][$routeStr] = $handler;
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}
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/**
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* @param array<int, mixed> $routeData
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* @param mixed $handler
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*/
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private function addVariableRoute(string $httpMethod, array $routeData, $handler): void
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{
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[$regex, $variables] = $this->buildRegexForRoute($routeData);
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if (isset($this->methodToRegexToRoutesMap[$httpMethod][$regex])) {
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throw new BadRouteException(sprintf(
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'Cannot register two routes matching "%s" for method "%s"',
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$regex,
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$httpMethod
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));
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}
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$this->methodToRegexToRoutesMap[$httpMethod][$regex] = new Route(
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$httpMethod,
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$handler,
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$regex,
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$variables
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);
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}
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/**
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* @param mixed[] $routeData
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*
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* @return mixed[]
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*/
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private function buildRegexForRoute(array $routeData): array
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{
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$regex = '';
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$variables = [];
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foreach ($routeData as $part) {
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if (is_string($part)) {
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$regex .= preg_quote($part, '~');
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continue;
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}
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[$varName, $regexPart] = $part;
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if (isset($variables[$varName])) {
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throw new BadRouteException(sprintf(
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'Cannot use the same placeholder "%s" twice',
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$varName
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));
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}
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if ($this->regexHasCapturingGroups($regexPart)) {
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throw new BadRouteException(sprintf(
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'Regex "%s" for parameter "%s" contains a capturing group',
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$regexPart,
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$varName
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));
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}
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$variables[$varName] = $varName;
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$regex .= '(' . $regexPart . ')';
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}
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return [$regex, $variables];
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}
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private function regexHasCapturingGroups(string $regex): bool
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{
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if (strpos($regex, '(') === false) {
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// Needs to have at least a ( to contain a capturing group
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return false;
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}
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// Semi-accurate detection for capturing groups
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return (bool) preg_match(
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'~
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(?:
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\(\?\(
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| \[ [^\]\\\\]* (?: \\\\ . [^\]\\\\]* )* \]
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| \\\\ .
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) (*SKIP)(*FAIL) |
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\(
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(?!
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\? (?! <(?![!=]) | P< | \' )
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| \*
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)
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~x',
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$regex
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);
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}
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}
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