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+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of phpDocumentor.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @link http://phpdoc.org
+ */
+
+namespace phpDocumentor\Reflection\DocBlock;
+
+use InvalidArgumentException;
+use phpDocumentor\Reflection\DocBlock\Tags\Author;
+use phpDocumentor\Reflection\DocBlock\Tags\Covers;
+use phpDocumentor\Reflection\DocBlock\Tags\Deprecated;
+use phpDocumentor\Reflection\DocBlock\Tags\Generic;
+use phpDocumentor\Reflection\DocBlock\Tags\InvalidTag;
+use phpDocumentor\Reflection\DocBlock\Tags\Link as LinkTag;
+use phpDocumentor\Reflection\DocBlock\Tags\Method;
+use phpDocumentor\Reflection\DocBlock\Tags\Param;
+use phpDocumentor\Reflection\DocBlock\Tags\Property;
+use phpDocumentor\Reflection\DocBlock\Tags\PropertyRead;
+use phpDocumentor\Reflection\DocBlock\Tags\PropertyWrite;
+use phpDocumentor\Reflection\DocBlock\Tags\Return_;
+use phpDocumentor\Reflection\DocBlock\Tags\See as SeeTag;
+use phpDocumentor\Reflection\DocBlock\Tags\Since;
+use phpDocumentor\Reflection\DocBlock\Tags\Source;
+use phpDocumentor\Reflection\DocBlock\Tags\Throws;
+use phpDocumentor\Reflection\DocBlock\Tags\Uses;
+use phpDocumentor\Reflection\DocBlock\Tags\Var_;
+use phpDocumentor\Reflection\DocBlock\Tags\Version;
+use phpDocumentor\Reflection\FqsenResolver;
+use phpDocumentor\Reflection\Types\Context as TypeContext;
+use ReflectionMethod;
+use ReflectionNamedType;
+use ReflectionParameter;
+use Webmozart\Assert\Assert;
+
+use function array_merge;
+use function array_slice;
+use function call_user_func_array;
+use function count;
+use function get_class;
+use function preg_match;
+use function strpos;
+use function trim;
+
+/**
+ * Creates a Tag object given the contents of a tag.
+ *
+ * This Factory is capable of determining the appropriate class for a tag and instantiate it using its `create`
+ * factory method. The `create` factory method of a Tag can have a variable number of arguments; this way you can
+ * pass the dependencies that you need to construct a tag object.
+ *
+ * > Important: each parameter in addition to the body variable for the `create` method must default to null, otherwise
+ * > it violates the constraint with the interface; it is recommended to use the {@see Assert::notNull()} method to
+ * > verify that a dependency is actually passed.
+ *
+ * This Factory also features a Service Locator component that is used to pass the right dependencies to the
+ * `create` method of a tag; each dependency should be registered as a service or as a parameter.
+ *
+ * When you want to use a Tag of your own with custom handling you need to call the `registerTagHandler` method, pass
+ * the name of the tag and a Fully Qualified Class Name pointing to a class that implements the Tag interface.
+ */
+final class StandardTagFactory implements TagFactory
+{
+ /** PCRE regular expression matching a tag name. */
+ public const REGEX_TAGNAME = '[\w\-\_\\\\:]+';
+
+ /**
+ * @var array<class-string<Tag>> An array with a tag as a key, and an
+ * FQCN to a class that handles it as an array value.
+ */
+ private $tagHandlerMappings = [
+ 'author' => Author::class,
+ 'covers' => Covers::class,
+ 'deprecated' => Deprecated::class,
+ // 'example' => '\phpDocumentor\Reflection\DocBlock\Tags\Example',
+ 'link' => LinkTag::class,
+ 'method' => Method::class,
+ 'param' => Param::class,
+ 'property-read' => PropertyRead::class,
+ 'property' => Property::class,
+ 'property-write' => PropertyWrite::class,
+ 'return' => Return_::class,
+ 'see' => SeeTag::class,
+ 'since' => Since::class,
+ 'source' => Source::class,
+ 'throw' => Throws::class,
+ 'throws' => Throws::class,
+ 'uses' => Uses::class,
+ 'var' => Var_::class,
+ 'version' => Version::class,
+ ];
+
+ /**
+ * @var array<class-string<Tag>> An array with a anotation s a key, and an
+ * FQCN to a class that handles it as an array value.
+ */
+ private $annotationMappings = [];
+
+ /**
+ * @var ReflectionParameter[][] a lazy-loading cache containing parameters
+ * for each tagHandler that has been used.
+ */
+ private $tagHandlerParameterCache = [];
+
+ /** @var FqsenResolver */
+ private $fqsenResolver;
+
+ /**
+ * @var mixed[] an array representing a simple Service Locator where we can store parameters and
+ * services that can be inserted into the Factory Methods of Tag Handlers.
+ */
+ private $serviceLocator = [];
+
+ /**
+ * Initialize this tag factory with the means to resolve an FQSEN and optionally a list of tag handlers.
+ *
+ * If no tag handlers are provided than the default list in the {@see self::$tagHandlerMappings} property
+ * is used.
+ *
+ * @see self::registerTagHandler() to add a new tag handler to the existing default list.
+ *
+ * @param array<class-string<Tag>> $tagHandlers
+ */
+ public function __construct(FqsenResolver $fqsenResolver, ?array $tagHandlers = null)
+ {
+ $this->fqsenResolver = $fqsenResolver;
+ if ($tagHandlers !== null) {
+ $this->tagHandlerMappings = $tagHandlers;
+ }
+
+ $this->addService($fqsenResolver, FqsenResolver::class);
+ }
+
+ public function create(string $tagLine, ?TypeContext $context = null): Tag
+ {
+ if (!$context) {
+ $context = new TypeContext('');
+ }
+
+ [$tagName, $tagBody] = $this->extractTagParts($tagLine);
+
+ return $this->createTag(trim($tagBody), $tagName, $context);
+ }
+
+ /**
+ * @param mixed $value
+ */
+ public function addParameter(string $name, $value): void
+ {
+ $this->serviceLocator[$name] = $value;
+ }
+
+ public function addService(object $service, ?string $alias = null): void
+ {
+ $this->serviceLocator[$alias ?: get_class($service)] = $service;
+ }
+
+ public function registerTagHandler(string $tagName, string $handler): void
+ {
+ Assert::stringNotEmpty($tagName);
+ Assert::classExists($handler);
+ Assert::implementsInterface($handler, Tag::class);
+
+ if (strpos($tagName, '\\') && $tagName[0] !== '\\') {
+ throw new InvalidArgumentException(
+ 'A namespaced tag must have a leading backslash as it must be fully qualified'
+ );
+ }
+
+ $this->tagHandlerMappings[$tagName] = $handler;
+ }
+
+ /**
+ * Extracts all components for a tag.
+ *
+ * @return string[]
+ */
+ private function extractTagParts(string $tagLine): array
+ {
+ $matches = [];
+ if (!preg_match('/^@(' . self::REGEX_TAGNAME . ')((?:[\s\(\{])\s*([^\s].*)|$)/us', $tagLine, $matches)) {
+ throw new InvalidArgumentException(
+ 'The tag "' . $tagLine . '" does not seem to be wellformed, please check it for errors'
+ );
+ }
+
+ if (count($matches) < 3) {
+ $matches[] = '';
+ }
+
+ return array_slice($matches, 1);
+ }
+
+ /**
+ * Creates a new tag object with the given name and body or returns null if the tag name was recognized but the
+ * body was invalid.
+ */
+ private function createTag(string $body, string $name, TypeContext $context): Tag
+ {
+ $handlerClassName = $this->findHandlerClassName($name, $context);
+ $arguments = $this->getArgumentsForParametersFromWiring(
+ $this->fetchParametersForHandlerFactoryMethod($handlerClassName),
+ $this->getServiceLocatorWithDynamicParameters($context, $name, $body)
+ );
+
+ try {
+ $callable = [$handlerClassName, 'create'];
+ Assert::isCallable($callable);
+ /** @phpstan-var callable(string): ?Tag $callable */
+ $tag = call_user_func_array($callable, $arguments);
+
+ return $tag ?? InvalidTag::create($body, $name);
+ } catch (InvalidArgumentException $e) {
+ return InvalidTag::create($body, $name)->withError($e);
+ }
+ }
+
+ /**
+ * Determines the Fully Qualified Class Name of the Factory or Tag (containing a Factory Method `create`).
+ *
+ * @return class-string<Tag>
+ */
+ private function findHandlerClassName(string $tagName, TypeContext $context): string
+ {
+ $handlerClassName = Generic::class;
+ if (isset($this->tagHandlerMappings[$tagName])) {
+ $handlerClassName = $this->tagHandlerMappings[$tagName];
+ } elseif ($this->isAnnotation($tagName)) {
+ // TODO: Annotation support is planned for a later stage and as such is disabled for now
+ $tagName = (string) $this->fqsenResolver->resolve($tagName, $context);
+ if (isset($this->annotationMappings[$tagName])) {
+ $handlerClassName = $this->annotationMappings[$tagName];
+ }
+ }
+
+ return $handlerClassName;
+ }
+
+ /**
+ * Retrieves the arguments that need to be passed to the Factory Method with the given Parameters.
+ *
+ * @param ReflectionParameter[] $parameters
+ * @param mixed[] $locator
+ *
+ * @return mixed[] A series of values that can be passed to the Factory Method of the tag whose parameters
+ * is provided with this method.
+ */
+ private function getArgumentsForParametersFromWiring(array $parameters, array $locator): array
+ {
+ $arguments = [];
+ foreach ($parameters as $parameter) {
+ $type = $parameter->getType();
+ $typeHint = null;
+ if ($type instanceof ReflectionNamedType) {
+ $typeHint = $type->getName();
+ if ($typeHint === 'self') {
+ $declaringClass = $parameter->getDeclaringClass();
+ if ($declaringClass !== null) {
+ $typeHint = $declaringClass->getName();
+ }
+ }
+ }
+
+ if (isset($locator[$typeHint])) {
+ $arguments[] = $locator[$typeHint];
+ continue;
+ }
+
+ $parameterName = $parameter->getName();
+ if (isset($locator[$parameterName])) {
+ $arguments[] = $locator[$parameterName];
+ continue;
+ }
+
+ $arguments[] = null;
+ }
+
+ return $arguments;
+ }
+
+ /**
+ * Retrieves a series of ReflectionParameter objects for the static 'create' method of the given
+ * tag handler class name.
+ *
+ * @param class-string $handlerClassName
+ *
+ * @return ReflectionParameter[]
+ */
+ private function fetchParametersForHandlerFactoryMethod(string $handlerClassName): array
+ {
+ if (!isset($this->tagHandlerParameterCache[$handlerClassName])) {
+ $methodReflection = new ReflectionMethod($handlerClassName, 'create');
+ $this->tagHandlerParameterCache[$handlerClassName] = $methodReflection->getParameters();
+ }
+
+ return $this->tagHandlerParameterCache[$handlerClassName];
+ }
+
+ /**
+ * Returns a copy of this class' Service Locator with added dynamic parameters,
+ * such as the tag's name, body and Context.
+ *
+ * @param TypeContext $context The Context (namespace and aliasses) that may be
+ * passed and is used to resolve FQSENs.
+ * @param string $tagName The name of the tag that may be
+ * passed onto the factory method of the Tag class.
+ * @param string $tagBody The body of the tag that may be
+ * passed onto the factory method of the Tag class.
+ *
+ * @return mixed[]
+ */
+ private function getServiceLocatorWithDynamicParameters(
+ TypeContext $context,
+ string $tagName,
+ string $tagBody
+ ): array {
+ return array_merge(
+ $this->serviceLocator,
+ [
+ 'name' => $tagName,
+ 'body' => $tagBody,
+ TypeContext::class => $context,
+ ]
+ );
+ }
+
+ /**
+ * Returns whether the given tag belongs to an annotation.
+ *
+ * @todo this method should be populated once we implement Annotation notation support.
+ */
+ private function isAnnotation(string $tagContent): bool
+ {
+ // 1. Contains a namespace separator
+ // 2. Contains parenthesis
+ // 3. Is present in a list of known annotations (make the algorithm smart by first checking is the last part
+ // of the annotation class name matches the found tag name
+
+ return false;
+ }
+}