<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2023 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\Util;
/**
* A docblock representation.
*
* Based on PHP-DocBlock-Parser by Paul Scott:
*
* {@link http://www.github.com/icio/PHP-DocBlock-Parser}
*
* @author Paul Scott <paul@duedil.com>
* @author Justin Hileman <justin@justinhileman.info>
*/
class Docblock
{
/**
* Tags in the docblock that have a whitespace-delimited number of parameters
* (such as `@param type var desc` and `@return type desc`) and the names of
* those parameters.
*
* @var array
*/
public static $vectors = [
'throws' => ['type', 'desc'],
'param' => ['type', 'var', 'desc'],
'return' => ['type', 'desc'],
];
protected $reflector;
/**
* The description of the symbol.
*
* @var string
*/
public $desc;
/**
* The tags defined in the docblock.
*
* The array has keys which are the tag names (excluding the @) and values
* that are arrays, each of which is an entry for the tag.
*
* In the case where the tag name is defined in {@see DocBlock::$vectors} the
* value within the tag-value array is an array in itself with keys as
* described by {@see DocBlock::$vectors}.
*
* @var array
*/
public $tags;
/**
* The entire DocBlock comment that was parsed.
*
* @var string
*/
public $comment;
/**
* Docblock constructor.
*
* @param \Reflector $reflector
*/
public function __construct(\Reflector $reflector)
{
$this->reflector = $reflector;
if ($reflector instanceof \ReflectionClass || $reflector instanceof \ReflectionClassConstant || $reflector instanceof \ReflectionFunctionAbstract || $reflector instanceof \ReflectionProperty) {
$this->setComment($reflector->getDocComment());
}
}
/**
* Set and parse the docblock comment.
*
* @param string $comment The docblock
*/
protected function setComment(string $comment)
{
$this->desc = '';
$this->tags = [];
$this->comment = $comment;
$this->parseComment($comment);
}
/**
* Find the length of the docblock prefix.
*
* @param array $lines
*
* @return int Prefix length
*/
protected static function prefixLength(array $lines): int
{
// find only lines with interesting things
$lines = \array_filter($lines, function ($line) {
return \substr($line, \strspn($line, "* \t\n\r\0\x0B"));
});
// if we sort the lines, we only have to compare two items
\sort($lines);
$first = \reset($lines);
$last = \end($lines);
// Special case for single-line comments
if (\count($lines) === 1) {
return \strspn($first, "* \t\n\r\0\x0B");
}
// find the longest common substring
$count = \min(\strlen($first), \strlen($last));
for ($i = 0; $i < $count; $i++) {
if ($first[$i] !== $last[$i]) {
return $i;
}
}
return $count;
}
/**
* Parse the comment into the component parts and set the state of the object.
*
* @param string $comment The docblock
*/
protected function parseComment(string $comment)
{
// Strip the opening and closing tags of the docblock
$comment = \substr($comment, 3, -2);
// Split into arrays of lines
$comment = \array_filter(\preg_split('/\r?\n\r?/', $comment));
// Trim asterisks and whitespace from the beginning and whitespace from the end of lines
$prefixLength = self::prefixLength($comment);
$comment = \array_map(function ($line) use ($prefixLength) {
return \rtrim(\substr($line, $prefixLength));
}, $comment);
// Group the lines together by @tags
$blocks = [];
$b = -1;
foreach ($comment as $line) {
if (self::isTagged($line)) {
$b++;
$blocks[] = [];
} elseif ($b === -1) {
$b = 0;
$blocks[] = [];
}
$blocks[$b][] = $line;
}
// Parse the blocks
foreach ($blocks as $block => $body) {
$body = \trim(\implode("\n", $body));
if ($block === 0 && !self::isTagged($body)) {
// This is the description block
$this->desc = $body;
} else {
// This block is tagged
$tag = \substr(self::strTag($body), 1);
$body = \ltrim(\substr($body, \strlen($tag) + 2));
if (isset(self::$vectors[$tag])) {
// The tagged block is a vector
$count = \count(self::$vectors[$tag]);
if ($body) {
$parts = \preg_split('/\s+/', $body, $count);
} else {
$parts = [];
}
// Default the trailing values
$parts = \array_pad($parts, $count, null);
// Store as a mapped array
$this->tags[$tag][] = \array_combine(self::$vectors[$tag], $parts);
} else {
// The tagged block is only text
$this->tags[$tag][] = $body;
}
}
}
}
/**
* Whether or not a docblock contains a given @tag.
*
* @param string $tag The name of the @tag to check for
*/
public function hasTag(string $tag): bool
{
return \is_array($this->tags) && \array_key_exists($tag, $this->tags);
}
/**
* The value of a tag.
*
* @param string $tag
*
* @return array|null
*/
public function tag(string $tag): ?array
{
return $this->hasTag($tag) ? $this->tags[$tag] : null;
}
/**
* Whether or not a string begins with a @tag.
*
* @param string $str
*/
public static function isTagged(string $str): bool
{
return isset($str[1]) && $str[0] === '@' && !\preg_match('/[^A-Za-z]/', $str[1]);
}
/**
* The tag at the beginning of a string.
*
* @param string $str
*
* @return string|null
*/
public static function strTag(string $str)
{
if (\preg_match('/^@[a-z0-9_]+/', $str, $matches)) {
return $matches[0];
}
}
}
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