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vendor/league/commonmark/src/Reference/Reference.php

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+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * 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\Reference;
+
+final class Reference implements ReferenceInterface
+{
+    /**
+     * @var string
+     */
+    protected $label;
+
+    /**
+     * @var string
+     */
+    protected $destination;
+
+    /**
+     * @var string
+     */
+    protected $title;
+
+    /**
+     * @var array<int, array<int, string>>
+     *
+     * Source: https://github.com/symfony/polyfill-mbstring/blob/master/Mbstring.php
+     */
+    private static $caseFold = [
+        ['µ', 'ſ', "\xCD\x85", 'ς', "\xCF\x90", "\xCF\x91", "\xCF\x95", "\xCF\x96", "\xCF\xB0", "\xCF\xB1", "\xCF\xB5", "\xE1\xBA\x9B", "\xE1\xBE\xBE", "\xC3\x9F", "\xE1\xBA\x9E"],
+        ['μ', 's', 'ι',        'σ', 'β',        'θ',        'φ',        'π',        'κ',        'ρ',        'ε',        "\xE1\xB9\xA1", 'ι',            'ss',       'ss'],
+    ];
+
+    public function __construct(string $label, string $destination, string $title)
+    {
+        $this->label = self::normalizeReference($label);
+        $this->destination = $destination;
+        $this->title = $title;
+    }
+
+    public function getLabel(): string
+    {
+        return $this->label;
+    }
+
+    public function getDestination(): string
+    {
+        return $this->destination;
+    }
+
+    public function getTitle(): string
+    {
+        return $this->title;
+    }
+
+    /**
+     * Normalize reference label
+     *
+     * This enables case-insensitive label matching
+     *
+     * @param string $string
+     *
+     * @return string
+     */
+    public static function normalizeReference(string $string): string
+    {
+        // Collapse internal whitespace to single space and remove
+        // leading/trailing whitespace
+        $string = \preg_replace('/\s+/', ' ', \trim($string));
+
+        if (!\defined('MB_CASE_FOLD')) {
+            // We're not on a version of PHP (7.3+) which has this feature
+            $string = \str_replace(self::$caseFold[0], self::$caseFold[1], $string);
+
+            return \mb_strtoupper($string, 'UTF-8');
+        }
+
+        return \mb_convert_case($string, \MB_CASE_FOLD, 'UTF-8');
+    }
+}

vendor/league/commonmark/src/Reference/ReferenceInterface.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * 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\Reference;
+
+/**
+ * Link reference
+ */
+interface ReferenceInterface
+{
+    public function getLabel(): string;
+
+    public function getDestination(): string;
+
+    public function getTitle(): string;
+}

vendor/league/commonmark/src/Reference/ReferenceMap.php

@@ -0,0 +1,55 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * 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\Reference;
+
+/**
+ * A collection of references, indexed by label
+ */
+final class ReferenceMap implements ReferenceMapInterface
+{
+    /**
+     * @var ReferenceInterface[]
+     */
+    protected $references = [];
+
+    public function addReference(ReferenceInterface $reference): void
+    {
+        $key = Reference::normalizeReference($reference->getLabel());
+        $this->references[$key] = $reference;
+    }
+
+    public function contains(string $label): bool
+    {
+        $label = Reference::normalizeReference($label);
+
+        return isset($this->references[$label]);
+    }
+
+    public function getReference(string $label): ?ReferenceInterface
+    {
+        $label = Reference::normalizeReference($label);
+
+        if (!isset($this->references[$label])) {
+            return null;
+        }
+
+        return $this->references[$label];
+    }
+
+    public function listReferences(): iterable
+    {
+        return \array_values($this->references);
+    }
+}

vendor/league/commonmark/src/Reference/ReferenceMapInterface.php

@@ -0,0 +1,49 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * 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\Reference;
+
+/**
+ * A collection of references
+ */
+interface ReferenceMapInterface
+{
+    /**
+     * @param ReferenceInterface $reference
+     *
+     * @return void
+     */
+    public function addReference(ReferenceInterface $reference): void;
+
+    /**
+     * @param string $label
+     *
+     * @return bool
+     */
+    public function contains(string $label): bool;
+
+    /**
+     * @param string $label
+     *
+     * @return ReferenceInterface|null
+     */
+    public function getReference(string $label): ?ReferenceInterface;
+
+    /**
+     * Lists all registered references.
+     *
+     * @return ReferenceInterface[]
+     */
+    public function listReferences(): iterable;
+}

vendor/league/commonmark/src/Reference/ReferenceParser.php

@@ -0,0 +1,123 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * 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\Reference;
+
+use League\CommonMark\Cursor;
+use League\CommonMark\Util\LinkParserHelper;
+
+final class ReferenceParser
+{
+    /**
+     * @var ReferenceMapInterface
+     */
+    private $referenceMap;
+
+    public function __construct(ReferenceMapInterface $referenceMap)
+    {
+        $this->referenceMap = $referenceMap;
+    }
+
+    /**
+     * Attempt to parse a link reference, modifying the refmap.
+     *
+     * @param Cursor $cursor
+     *
+     * @return bool
+     */
+    public function parse(Cursor $cursor)
+    {
+        if ($cursor->isAtEnd()) {
+            return false;
+        }
+
+        $initialState = $cursor->saveState();
+
+        $matchChars = LinkParserHelper::parseLinkLabel($cursor);
+        if ($matchChars === 0) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        // We need to trim the opening and closing brackets from the previously-matched text
+        $label = \substr($cursor->getPreviousText(), 1, -1);
+
+        if (\preg_match('/[^\s]/', $label) === 0) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        if ($cursor->getCharacter() !== ':') {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        // Advance past the colon
+        $cursor->advanceBy(1);
+
+        // Link URL
+        $cursor->advanceToNextNonSpaceOrNewline();
+
+        $destination = LinkParserHelper::parseLinkDestination($cursor);
+        if ($destination === null) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        $previousState = $cursor->saveState();
+
+        if ($cursor->advanceToNextNonSpaceOrNewline() > 0) {
+            $title = LinkParserHelper::parseLinkTitle($cursor);
+        }
+
+        if (!isset($title)) {
+            $title = '';
+            $cursor->restoreState($previousState);
+        }
+
+        // Make sure we're at line end:
+        $atLineEnd = true;
+        if ($cursor->match('/^ *(?:\n|$)/') === null) {
+            if ($title === '') {
+                $atLineEnd = false;
+            } else {
+                // The potential title we found is not at the line end,
+                // but it could still be a legal link reference if we
+                // discard the title
+                $title = '';
+                // rewind before spaces
+                $cursor->restoreState($previousState);
+                // and instead check if the link URL is at the line end
+                $atLineEnd = $cursor->match('/^ *(?:\n|$)/') !== null;
+            }
+        }
+
+        if (!$atLineEnd) {
+            $cursor->restoreState($initialState);
+
+            return false;
+        }
+
+        if (!$this->referenceMap->contains($label)) {
+            $reference = new Reference($label, $destination, $title);
+            $this->referenceMap->addReference($reference);
+        }
+
+        return true;
+    }
+}