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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;
use InvalidArgumentException;
use LogicException;
use phpDocumentor\Reflection\DocBlock\DescriptionFactory;
use phpDocumentor\Reflection\DocBlock\StandardTagFactory;
use phpDocumentor\Reflection\DocBlock\Tag;
use phpDocumentor\Reflection\DocBlock\TagFactory;
use Webmozart\Assert\Assert;
use function array_shift;
use function count;
use function explode;
use function is_object;
use function method_exists;
use function preg_match;
use function preg_replace;
use function str_replace;
use function strpos;
use function substr;
use function trim;
final class DocBlockFactory implements DocBlockFactoryInterface
{
/** @var DocBlock\DescriptionFactory */
private $descriptionFactory;
/** @var DocBlock\TagFactory */
private $tagFactory;
/**
* Initializes this factory with the required subcontractors.
*/
public function __construct(DescriptionFactory $descriptionFactory, TagFactory $tagFactory)
{
$this->descriptionFactory = $descriptionFactory;
$this->tagFactory = $tagFactory;
}
/**
* Factory method for easy instantiation.
*
* @param array<string, class-string<Tag>> $additionalTags
*/
public static function createInstance(array $additionalTags = []): self
{
$fqsenResolver = new FqsenResolver();
$tagFactory = new StandardTagFactory($fqsenResolver);
$descriptionFactory = new DescriptionFactory($tagFactory);
$tagFactory->addService($descriptionFactory);
$tagFactory->addService(new TypeResolver($fqsenResolver));
$docBlockFactory = new self($descriptionFactory, $tagFactory);
foreach ($additionalTags as $tagName => $tagHandler) {
$docBlockFactory->registerTagHandler($tagName, $tagHandler);
}
return $docBlockFactory;
}
/**
* @param object|string $docblock A string containing the DocBlock to parse or an object supporting the
* getDocComment method (such as a ReflectionClass object).
*/
public function create($docblock, ?Types\Context $context = null, ?Location $location = null): DocBlock
{
if (is_object($docblock)) {
if (!method_exists($docblock, 'getDocComment')) {
$exceptionMessage = 'Invalid object passed; the given object must support the getDocComment method';
throw new InvalidArgumentException($exceptionMessage);
}
$docblock = $docblock->getDocComment();
Assert::string($docblock);
}
Assert::stringNotEmpty($docblock);
if ($context === null) {
$context = new Types\Context('');
}
$parts = $this->splitDocBlock($this->stripDocComment($docblock));
[$templateMarker, $summary, $description, $tags] = $parts;
return new DocBlock(
$summary,
$description ? $this->descriptionFactory->create($description, $context) : null,
$this->parseTagBlock($tags, $context),
$context,
$location,
$templateMarker === '#@+',
$templateMarker === '#@-'
);
}
/**
* @param class-string<Tag> $handler
*/
public function registerTagHandler(string $tagName, string $handler): void
{
$this->tagFactory->registerTagHandler($tagName, $handler);
}
/**
* Strips the asterisks from the DocBlock comment.
*
* @param string $comment String containing the comment text.
*/
private function stripDocComment(string $comment): string
{
$comment = preg_replace('#[ \t]*(?:\/\*\*|\*\/|\*)?[ \t]?(.*)?#u', '$1', $comment);
Assert::string($comment);
$comment = trim($comment);
// reg ex above is not able to remove */ from a single line docblock
if (substr($comment, -2) === '*/') {
$comment = trim(substr($comment, 0, -2));
}
return str_replace(["\r\n", "\r"], "\n", $comment);
}
// phpcs:disable
/**
* Splits the DocBlock into a template marker, summary, description and block of tags.
*
* @param string $comment Comment to split into the sub-parts.
*
* @return string[] containing the template marker (if any), summary, description and a string containing the tags.
*
* @author Mike van Riel <me@mikevanriel.com> for extending the regex with template marker support.
*
* @author Richard van Velzen (@_richardJ) Special thanks to Richard for the regex responsible for the split.
*/
private function splitDocBlock(string $comment) : array
{
// phpcs:enable
// Performance improvement cheat: if the first character is an @ then only tags are in this DocBlock. This
// method does not split tags so we return this verbatim as the fourth result (tags). This saves us the
// performance impact of running a regular expression
if (strpos($comment, '@') === 0) {
return ['', '', '', $comment];
}
// clears all extra horizontal whitespace from the line endings to prevent parsing issues
$comment = preg_replace('/\h*$/Sum', '', $comment);
Assert::string($comment);
/*
* Splits the docblock into a template marker, summary, description and tags section.
*
* - The template marker is empty, #@+ or #@- if the DocBlock starts with either of those (a newline may
* occur after it and will be stripped).
* - The short description is started from the first character until a dot is encountered followed by a
* newline OR two consecutive newlines (horizontal whitespace is taken into account to consider spacing
* errors). This is optional.
* - The long description, any character until a new line is encountered followed by an @ and word
* characters (a tag). This is optional.
* - Tags; the remaining characters
*
* Big thanks to RichardJ for contributing this Regular Expression
*/
preg_match(
'/
\A
# 1. Extract the template marker
(?:(\#\@\+|\#\@\-)\n?)?
# 2. Extract the summary
(?:
(?! @\pL ) # The summary may not start with an @
(
[^\n.]+
(?:
(?! \. \n | \n{2} ) # End summary upon a dot followed by newline or two newlines
[\n.]* (?! [ \t]* @\pL ) # End summary when an @ is found as first character on a new line
[^\n.]+ # Include anything else
)*
\.?
)?
)
# 3. Extract the description
(?:
\s* # Some form of whitespace _must_ precede a description because a summary must be there
(?! @\pL ) # The description may not start with an @
(
[^\n]+
(?: \n+
(?! [ \t]* @\pL ) # End description when an @ is found as first character on a new line
[^\n]+ # Include anything else
)*
)
)?
# 4. Extract the tags (anything that follows)
(\s+ [\s\S]*)? # everything that follows
/ux',
$comment,
$matches
);
array_shift($matches);
while (count($matches) < 4) {
$matches[] = '';
}
return $matches;
}
/**
* Creates the tag objects.
*
* @param string $tags Tag block to parse.
* @param Types\Context $context Context of the parsed Tag
*
* @return DocBlock\Tag[]
*/
private function parseTagBlock(string $tags, Types\Context $context): array
{
$tags = $this->filterTagBlock($tags);
if ($tags === null) {
return [];
}
$result = [];
$lines = $this->splitTagBlockIntoTagLines($tags);
foreach ($lines as $key => $tagLine) {
$result[$key] = $this->tagFactory->create(trim($tagLine), $context);
}
return $result;
}
/**
* @return string[]
*/
private function splitTagBlockIntoTagLines(string $tags): array
{
$result = [];
foreach (explode("\n", $tags) as $tagLine) {
if ($tagLine !== '' && strpos($tagLine, '@') === 0) {
$result[] = $tagLine;
} else {
$result[count($result) - 1] .= "\n" . $tagLine;
}
}
return $result;
}
private function filterTagBlock(string $tags): ?string
{
$tags = trim($tags);
if (!$tags) {
return null;
}
if ($tags[0] !== '@') {
// @codeCoverageIgnoreStart
// Can't simulate this; this only happens if there is an error with the parsing of the DocBlock that
// we didn't foresee.
throw new LogicException('A tag block started with text instead of an at-sign(@): ' . $tags);
// @codeCoverageIgnoreEnd
}
return $tags;
}
}
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