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📄 Description.php(3.45 KB)
📄 DescriptionFactory.php(6.62 KB)
📄 ExampleFinder.php(4.6 KB)
📄 Serializer.php(4.58 KB)
📄 StandardTagFactory.php(12.33 KB)
📄 Tag.php(669 B)
📄 TagFactory.php(3.62 KB)
📁 Tags

Editing: DescriptionFactory.php

<?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 phpDocumentor\Reflection\Types\Context as TypeContext;
use Webmozart\Assert\Assert;
use function count;
use function explode;
use function implode;
use function ltrim;
use function min;
use function preg_split;
use function str_replace;
use function strlen;
use function strpos;
use function substr;
use function trim;
use const PREG_SPLIT_DELIM_CAPTURE;

/**
 * Creates a new Description object given a body of text.
 *
 * Descriptions in phpDocumentor are somewhat complex entities as they can contain one or more tags inside their
 * body that can be replaced with a readable output. The replacing is done by passing a Formatter object to the
 * Description object's `render` method.
 *
 * In addition to the above does a Description support two types of escape sequences:
 *
 * 1. `{@}` to escape the `@` character to prevent it from being interpreted as part of a tag, i.e. `{{@}link}`
 * 2. `{}` to escape the `}` character, this can be used if you want to use the `}` character in the description
 *    of an inline tag.
 *
 * If a body consists of multiple lines then this factory will also remove any superfluous whitespace at the beginning
 * of each line while maintaining any indentation that is used. This will prevent formatting parsers from tripping
 * over unexpected spaces as can be observed with tag descriptions.
 */
class DescriptionFactory
{
    /** @var TagFactory */
    private $tagFactory;

/**
     * Initializes this factory with the means to construct (inline) tags.
     */
    public function __construct(TagFactory $tagFactory)
    {
        $this->tagFactory = $tagFactory;
    }

/**
     * Returns the parsed text of this description.
     */
    public function create(string $contents, ?TypeContext $context = null) : Description
    {
        $tokens   = $this->lex($contents);
        $count    = count($tokens);
        $tagCount = 0;
        $tags     = [];

for ($i = 1; $i < $count; $i += 2) {
            $tags[]     = $this->tagFactory->create($tokens[$i], $context);
            $tokens[$i] = '%' . ++$tagCount . '$s';
        }

//In order to allow "literal" inline tags, the otherwise invalid
        //sequence "{@}" is changed to "@", and "{}" is changed to "}".
        //"%" is escaped to "%%" because of vsprintf.
        //See unit tests for examples.
        for ($i = 0; $i < $count; $i += 2) {
            $tokens[$i] = str_replace(['{@}', '{}', '%'], ['@', '}', '%%'], $tokens[$i]);
        }

return new Description(implode('', $tokens), $tags);
    }

/**
     * Strips the contents from superfluous whitespace and splits the description into a series of tokens.
     *
     * @return string[] A series of tokens of which the description text is composed.
     */
    private function lex(string $contents) : array
    {
        $contents = $this->removeSuperfluousStartingWhitespace($contents);

// performance optimalization; if there is no inline tag, don't bother splitting it up.
        if (strpos($contents, '{@') === false) {
            return [$contents];
        }

$parts =  preg_split(
            '/\{
                # "{@}" is not a valid inline tag. This ensures that we do not treat it as one, but treat it literally.
                (?!@\})
                # We want to capture the whole tag line, but without the inline tag delimiters.
                (\@
                    # Match everything up to the next delimiter.
                    [^{}]*
                    # Nested inline tag content should not be captured, or it will appear in the result separately.
                    (?:
                        # Match nested inline tags.
                        (?:
                            # Because we did not catch the tag delimiters earlier, we must be explicit with them here.
                            # Notice that this also matches "{}", as a way to later introduce it as an escape sequence.
                            \{(?1)?\}
                            |
                            # Make sure we match hanging "{".
                            \{
                        )
                        # Match content after the nested inline tag.
                        [^{}]*
                    )* # If there are more inline tags, match them as well. We use "*" since there may not be any
                       # nested inline tags.
                )
            \}/Sux',
            $contents,
            0,
            PREG_SPLIT_DELIM_CAPTURE
        );
        Assert::isArray($parts);

return $parts;
    }

/**
     * Removes the superfluous from a multi-line description.
     *
     * When a description has more than one line then it can happen that the second and subsequent lines have an
     * additional indentation. This is commonly in use with tags like this:
     *
     *     {@}since 1.1.0 This is an example
     *         description where we have an
     *         indentation in the second and
     *         subsequent lines.
     *
     * If we do not normalize the indentation then we have superfluous whitespace on the second and subsequent
     * lines and this may cause rendering issues when, for example, using a Markdown converter.
     */
    private function removeSuperfluousStartingWhitespace(string $contents) : string
    {
        $lines = explode("\n", $contents);

// if there is only one line then we don't have lines with superfluous whitespace and
        // can use the contents as-is
        if (count($lines) <= 1) {
            return $contents;
        }

// determine how many whitespace characters need to be stripped
        $startingSpaceCount = 9999999;
        for ($i = 1, $iMax = count($lines); $i < $iMax; ++$i) {
            // lines with a no length do not count as they are not indented at all
            if (trim($lines[$i]) === '') {
                continue;
            }

// determine the number of prefixing spaces by checking the difference in line length before and after
            // an ltrim
            $startingSpaceCount = min($startingSpaceCount, strlen($lines[$i]) - strlen(ltrim($lines[$i])));
        }

// strip the number of spaces from each line
        if ($startingSpaceCount > 0) {
            for ($i = 1, $iMax = count($lines); $i < $iMax; ++$i) {
                $lines[$i] = substr($lines[$i], $startingSpaceCount);
            }
        }

return implode("\n", $lines);
    }
}

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