Move HTML to Markdown library to Composer

vendor/league/html-to-markdown/src/Converter/CodeConverter.php

@@ -0,0 +1,62 @@
+<?php
+
+namespace League\HTMLToMarkdown\Converter;
+
+use League\HTMLToMarkdown\ElementInterface;
+
+class CodeConverter implements ConverterInterface
+{
+    /**
+     * @param ElementInterface $element
+     *
+     * @return string
+     */
+    public function convert(ElementInterface $element)
+    {
+        $language = null;
+
+        // Checking for language class on the code block
+        $classes = $element->getAttribute('class');
+
+        if ($classes) {
+            // Since tags can have more than one class, we need to find the one that starts with 'language-'
+            $classes = explode(' ', $classes);
+            foreach ($classes as $class) {
+                if (strpos($class, 'language-') !== false) {
+                    // Found one, save it as the selected language and stop looping over the classes.
+                    // The space after the language avoids gluing the actual code with the language tag
+                    $language = str_replace('language-', '', $class) . ' ';
+                    break;
+                }
+            }
+        }
+
+        $markdown = '';
+        $code = html_entity_decode($element->getChildrenAsString());
+
+        // In order to remove the code tags we need to search for them and, in the case of the opening tag
+        // use a regular expression to find the tag and the other attributes it might have
+        $code = preg_replace('/<code\b[^>]*>/', '', $code);
+        $code = str_replace('</code>', '', $code);
+
+        // Checking if the code has multiple lines
+        $lines = preg_split('/\r\n|\r|\n/', $code);
+        if (count($lines) > 1) {
+            // Multiple lines detected, adding three backticks and newlines
+            $markdown .= '```' . $language . "\n" . $code . "\n" . '```';
+        } else {
+            // One line of code, wrapping it on one backtick.
+            $markdown .= '`' . $language . $code . '`';
+        }
+
+        return $markdown;
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getSupportedTags()
+    {
+        return array('code');
+    }
+}