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1 <?php
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2
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3 namespace Libraries;
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4
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5 class MarkdownParser
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6 {
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7 public static function toHtml(string $markdown): string
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8 {
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9 $code_block_pattern = '/```([a-z]+)\s+(.*?)\s+```/si';
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10 $inline_code_pattern = '/`\s*(.*?)\s*`/si';
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11 $matches = [];
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12
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13 preg_match_all($code_block_pattern, $markdown, $matches, PREG_SET_ORDER);
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14 $code_blocks = [];
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15 foreach ($matches as $index => $match) {
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16 $code_blocks[] = [
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17 'language' => $match[1],
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18 'code' => $match[2],
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19 ];
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20 }
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21
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22 foreach ($matches as $index => $match) {
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23 $markdown = preg_replace('/'.preg_quote($match[0], '/').'/', '[CODE_BLOCK_'.$index.']', $markdown, 1);
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24 }
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25
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26 preg_match_all($inline_code_pattern, $markdown, $matches, PREG_SET_ORDER);
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27 $inline_code = [];
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28 foreach ($matches as $index => $match) {
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29 $inline_code[] = [
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30 'code' => $match[1],
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31 ];
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32 }
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33
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34 foreach ($matches as $index => $match) {
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35 $markdown = preg_replace('/'.preg_quote($match[0], '/').'/', '[INLINE_CODE_'.$index.']', $markdown, 1);
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36 }
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37
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38 $markdown = preg_replace('/`(.+?)`/', '<code>$1</code>', $markdown);
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39 $markdown = preg_replace('/\#{6}\s(.+)/', '<h6>$1</h6>', $markdown);
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40 $markdown = preg_replace('/\#{5}\s(.+)/', '<h5>$1</h5>', $markdown);
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41 $markdown = preg_replace('/\#{4}\s(.+)/', '<h4>$1</h4>', $markdown);
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42 $markdown = preg_replace('/\#{3}\s(.+)/', '<h3>$1</h3>', $markdown);
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43 $markdown = preg_replace('/\#{2}\s(.+)/', '<h2>$1</h2>', $markdown);
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44 $markdown = preg_replace('/\#\s(.+)/', '<h1>$1</h1>', $markdown);
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45 $markdown = preg_replace('/\*\*\*(.+?)\*\*\*/', '<strong><em>$1</em></strong>', $markdown);
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46 $markdown = preg_replace('/\*\*(.+?)\*\*/', '<strong>$1</strong>', $markdown);
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47 $markdown = preg_replace('/\*(.+?)\*/', '<em>$1</em>', $markdown);
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48 $markdown = preg_replace('/\[(.+?)\]\((.+?)\)/', '<a href="$2">$1</a>', $markdown);
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49 $markdown = preg_replace("/\r\n|\r|\n/", '<br>', $markdown);
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50
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51 foreach ($code_blocks as $index => $code_block) {
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52 $language = $code_block['language'];
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53 $language = $language == 'blade' ? 'html' : $language;
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54 $code_block['code'] = '<pre><code class="match-braces language-'.$language.'">'.htmlentities($code_block['code']).'</code></pre>';
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55 $markdown = str_replace('[CODE_BLOCK_'.$index.']', $code_block['code'], $markdown);
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56 }
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57
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58 foreach ($inline_code as $index => $code) {
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59 $code['code'] = '<code>'.htmlentities($code['code']).'</code>';
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60 $markdown = str_replace('[INLINE_CODE_'.$index.']', $code['code'], $markdown);
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61 }
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62
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63 return $markdown;
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64 }
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65 }
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