LinkParserHelper::manuallyParseLinkDestination() - Code Metrics - thephpleague/commonmark - Measure and Improve Code Quality continuously with Scrutinizer

LinkParserHelper::manuallyParseLinkDestination() C
last analyzed 2025-11-24 00:12 UTC

↳ Parent: LinkParserHelper

Complexity

Conditions	15
Paths	22

Size

Total Lines	38
Code Lines	24

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	15
eloc	24
nc	22
nop	1
dl	0
loc	38
rs	5.9166
c	1
b	0
f	0

How to fix Complexity

<?php

declare(strict_types=1);

/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <[email protected]>
 *
 * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
 *  - (c) John MacFarlane
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace League\CommonMark\Util;

use League\CommonMark\Parser\Cursor;

/**
 * @psalm-immutable
 */
final class LinkParserHelper
{
    /**
     * Attempt to parse link destination
     *
     * @return string|null The string, or null if no match
     */
    public static function parseLinkDestination(Cursor $cursor): ?string
    {
        if ($cursor->getCurrentCharacter() === '<') {
            return self::parseDestinationBraces($cursor);
        }

        $destination = self::manuallyParseLinkDestination($cursor);
        if ($destination === null) {
            return null;
        }

        return UrlEncoder::unescapeAndEncode(
            RegexHelper::unescape($destination)
        );
    }

    public static function parseLinkLabel(Cursor $cursor): int
    {
        $match = $cursor->match('/^\[(?:[^\\\\\[\]]|\\\\.){0,1000}\]/');
        if ($match === null) {
            return 0;
        }

        $length = \mb_strlen($match, 'UTF-8');

        if ($length > 1001) {
            return 0;
        }

        return $length;
    }

    public static function parsePartialLinkLabel(Cursor $cursor): ?string
    {
        return $cursor->match('/^(?:[^\\\\\[\]]++|\\\\.?)*+/');
    }

    /**
     * Attempt to parse link title (sans quotes)
     *
     * @return string|null The string, or null if no match
     */
    public static function parseLinkTitle(Cursor $cursor): ?string
    {
        if ($title = $cursor->match('/' . RegexHelper::PARTIAL_LINK_TITLE . '/')) {
            // Chop off quotes from title and unescape
            return RegexHelper::unescape(\substr($title, 1, -1));
        }

        return null;
    }

    public static function parsePartialLinkTitle(Cursor $cursor, string $endDelimiter): ?string
    {
        $endDelimiter = \preg_quote($endDelimiter, '/');
        $regex        = \sprintf('/(%s|[^%s\x00])*(?:%s)?/', RegexHelper::PARTIAL_ESCAPED_CHAR, $endDelimiter, $endDelimiter);
        if (($partialTitle = $cursor->match($regex)) === null) {
            return null;
        }

        return RegexHelper::unescape($partialTitle);
    }

    private static function manuallyParseLinkDestination(Cursor $cursor): ?string
    {
        $remainder  = $cursor->getRemainder();
        $openParens = 0;
        $len        = \strlen($remainder);
        for ($i = 0; $i < $len; $i++) {
            $c = $remainder[$i];
            if ($c === '\\' && $i + 1 < $len && RegexHelper::isEscapable($remainder[$i + 1])) {
                $i++;
            } elseif ($c === '(') {
                $openParens++;
                // Limit to 32 nested parens for pathological cases
                if ($openParens > 32) {
                    return null;
                }
            } elseif ($c === ')') {
                if ($openParens < 1) {
                    break;
                }

                $openParens--;
            } elseif (\ord($c) <= 32 && RegexHelper::isWhitespace($c)) {
                break;
            }
        }

        if ($openParens !== 0) {

            return null;
        }

        if ($i === 0 && (! isset($c) || $c !== ')')) {
            return null;
        }

        $destination = \substr($remainder, 0, $i);
        $cursor->advanceBy(\mb_strlen($destination, 'UTF-8'));

        return $destination;
    }

    /** @var \WeakReference<Cursor>|null */
    private static ?\WeakReference $lastCursor       = null;
    private static bool $lastCursorLacksClosingBrace = false;

    private static function parseDestinationBraces(Cursor $cursor): ?string
    {
        // Optimization: If we've previously parsed this cursor and returned `null`, we know
        // that no closing brace exists, so we can skip the regex entirely. This helps avoid
        // certain pathological cases where the regex engine can take a very long time to
        // determine that no match exists.
        if (self::$lastCursor !== null && self::$lastCursor->get() === $cursor) {
            if (self::$lastCursorLacksClosingBrace) {
                return null;
            }
        } else {
            self::$lastCursor = \WeakReference::create($cursor);
        }

        if ($res = $cursor->match(RegexHelper::REGEX_LINK_DESTINATION_BRACES)) {
            self::$lastCursorLacksClosingBrace = false;

            // Chop off surrounding <..>:
            return UrlEncoder::unescapeAndEncode(
                RegexHelper::unescape(\substr($res, 1, -1))
            );
        }

        self::$lastCursorLacksClosingBrace = true;

        return null;
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			/*
6			* This file is part of the league/commonmark package.
7			*
8			* (c) Colin O'Dell <[email protected]>
9			*
10			* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
11			* - (c) John MacFarlane
12			*
13			* For the full copyright and license information, please view the LICENSE
14			* file that was distributed with this source code.
15			*/
16
17			namespace League\CommonMark\Util;
18
19			use League\CommonMark\Parser\Cursor;
20
21			/**
22			* @psalm-immutable
23			*/
24			final class LinkParserHelper
25			{
26			/**
27			* Attempt to parse link destination
28			*
29			* @return string\|null The string, or null if no match
30			*/
31			public static function parseLinkDestination(Cursor $cursor): ?string
32			{
33			if ($cursor->getCurrentCharacter() === '<') {
34			return self::parseDestinationBraces($cursor);
35			}
36
37			$destination = self::manuallyParseLinkDestination($cursor);
38			if ($destination === null) {
39			return null;
40			}
41
42			return UrlEncoder::unescapeAndEncode(
43			RegexHelper::unescape($destination)
44			);
45			}
46
47			public static function parseLinkLabel(Cursor $cursor): int
48			{
49			$match = $cursor->match('/^\[(?:[^\\\\\[\]]\|\\\\.){0,1000}\]/');
50			if ($match === null) {
51			return 0;
52			}
53
54			$length = \mb_strlen($match, 'UTF-8');
55
56			if ($length > 1001) {
57			return 0;
58			}
59
60			return $length;
61			}
62
63			public static function parsePartialLinkLabel(Cursor $cursor): ?string
64			{
65			return $cursor->match('/^(?:[^\\\\\[\]]++\|\\\\.?)*+/');
66			}
67
68			/**
69			* Attempt to parse link title (sans quotes)
70			*
71			* @return string\|null The string, or null if no match
72			*/
73			public static function parseLinkTitle(Cursor $cursor): ?string
74			{
75			if ($title = $cursor->match('/' . RegexHelper::PARTIAL_LINK_TITLE . '/')) {
76			// Chop off quotes from title and unescape
77			return RegexHelper::unescape(\substr($title, 1, -1));
78			}
79
80			return null;
81			}
82
83			public static function parsePartialLinkTitle(Cursor $cursor, string $endDelimiter): ?string
84			{
85			$endDelimiter = \preg_quote($endDelimiter, '/');
86			$regex = \sprintf('/(%s\|[^%s\x00])*(?:%s)?/', RegexHelper::PARTIAL_ESCAPED_CHAR, $endDelimiter, $endDelimiter);
87			if (($partialTitle = $cursor->match($regex)) === null) {
88			return null;
89			}
90
91			return RegexHelper::unescape($partialTitle);
92			}
93
94			private static function manuallyParseLinkDestination(Cursor $cursor): ?string
95			{
96			$remainder = $cursor->getRemainder();
97			$openParens = 0;
98			$len = \strlen($remainder);
99			for ($i = 0; $i < $len; $i++) {
100			$c = $remainder[$i];
101			if ($c === '\\' && $i + 1 < $len && RegexHelper::isEscapable($remainder[$i + 1])) {
102			$i++;
103			} elseif ($c === '(') {
104			$openParens++;
105			// Limit to 32 nested parens for pathological cases
106			if ($openParens > 32) {
107			return null;
108			}
109			} elseif ($c === ')') {
110			if ($openParens < 1) {
111			break;
112			}
113
114			$openParens--;
115			} elseif (\ord($c) <= 32 && RegexHelper::isWhitespace($c)) {
116			break;
117			}
118			}
119
120			if ($openParens !== 0) {
			0 ignored issues – show introduced 2024-12-07 15:48 UTC by Report Bug Copy Issue Report The condition `$openParens !== 0` is always `false`. Loading history...
121			return null;
122			}
123
124			if ($i === 0 && (! isset($c) \|\| $c !== ')')) {
125			return null;
126			}
127
128			$destination = \substr($remainder, 0, $i);
129			$cursor->advanceBy(\mb_strlen($destination, 'UTF-8'));
130
131			return $destination;
132			}
133
134			/** @var \WeakReference<Cursor>\|null */
135			private static ?\WeakReference $lastCursor = null;
136			private static bool $lastCursorLacksClosingBrace = false;
137
138			private static function parseDestinationBraces(Cursor $cursor): ?string
139			{
140			// Optimization: If we've previously parsed this cursor and returned `null`, we know
141			// that no closing brace exists, so we can skip the regex entirely. This helps avoid
142			// certain pathological cases where the regex engine can take a very long time to
143			// determine that no match exists.
144			if (self::$lastCursor !== null && self::$lastCursor->get() === $cursor) {
145			if (self::$lastCursorLacksClosingBrace) {
146			return null;
147			}
148			} else {
149			self::$lastCursor = \WeakReference::create($cursor);
150			}
151
152			if ($res = $cursor->match(RegexHelper::REGEX_LINK_DESTINATION_BRACES)) {
153			self::$lastCursorLacksClosingBrace = false;
154
155			// Chop off surrounding <..>:
156			return UrlEncoder::unescapeAndEncode(
157			RegexHelper::unescape(\substr($res, 1, -1))
158			);
159			}
160
161			self::$lastCursorLacksClosingBrace = true;
162
163			return null;
164			}
165			}
166

thephpleague / commonmark

LinkParserHelper::manuallyParseLinkDestination() C last analyzed 2025-11-24 00:12 UTC

Complexity

Size

Duplication

Importance

How to fix Complexity

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LinkParserHelper::manuallyParseLinkDestination() C
last analyzed 2025-11-24 00:12 UTC