评论Markdown解析

functions.php

@@ -1655,4 +1655,53 @@ if (akina_option('sakura_widget')) {
         ));
     }
 }
+
+// 评论Markdown解析
+function markdown_parser($incoming_comment) {
+    global $wpdb,$comment_markdown_content;
+    $myCustomer = $wpdb->get_row("SELECT * FROM wp_comments");
+    //Add column if not present.
+    if (!isset($myCustomer->say_state)) {
+        $wpdb->query("ALTER TABLE wp_comments ADD comment_markdown text");
+    }
+    $comment_markdown_content = $incoming_comment['comment_content'];
+    include 'inc/Parsedown.php';
+    $Parsedown = new Parsedown();
+    $incoming_comment['comment_content'] = $Parsedown->text($incoming_comment['comment_content']);
+    return $incoming_comment;
+}
+add_filter('preprocess_comment' , 'markdown_parser');
+
+//保存Markdown评论
+function save_markdown_comment($comment_ID, $comment_approved) {
+    global $wpdb,$comment_markdown_content;
+    $comment = get_comment($comment_ID);
+    $comment_content = $comment_markdown_content;
+    //store markdow content
+    $wpdb->query("UPDATE wp_comments SET comment_markdown='".$comment_content."' WHERE comment_ID='".$comment_ID."';");
+}
+add_action('comment_post', 'save_markdown_comment', 10, 2);
+
+//打开评论HTML标签限制
+function allow_more_tag_in_comment() {
+	global $allowedtags;
+	$allowedtags['pre'] = array('class'=>array());
+	$allowedtags['code'] = array('class'=>array());
+	$allowedtags['h1'] = array('class'=>array());
+	$allowedtags['h2'] = array('class'=>array());
+	$allowedtags['h3'] = array('class'=>array());
+	$allowedtags['h4'] = array('class'=>array());
+	$allowedtags['h5'] = array('class'=>array());
+	$allowedtags['ul'] = array('class'=>array());
+	$allowedtags['ol'] = array('class'=>array());
+	$allowedtags['li'] = array('class'=>array());
+	$allowedtags['td'] = array('class'=>array());
+	$allowedtags['th'] = array('class'=>array());
+	$allowedtags['tr'] = array('class'=>array());
+	$allowedtags['table'] = array('class'=>array());
+	$allowedtags['thead'] = array('class'=>array());
+	$allowedtags['tbody'] = array('class'=>array());
+	$allowedtags['span'] = array('class'=>array());
+}
+add_action('pre_comment_on_post', 'allow_more_tag_in_comment');
 //code end 

inc/Parsedown.php

@@ -17,7 +17,7 @@ class Parsedown
 {
     # ~
 
-    const version = '1.7.1';
+    const version = '1.7.3';
 
     # ~
 
@@ -429,7 +429,21 @@ class Parsedown
 
             if (isset($matches[1]))
             {
-                $class = 'language-'.$matches[1];
+                /**
+                 * https://www.w3.org/TR/2011/WD-html5-20110525/elements.html#classes
+                 * Every HTML element may have a class attribute specified.
+                 * The attribute, if specified, must have a value that is a set
+                 * of space-separated tokens representing the various classes
+                 * that the element belongs to.
+                 * [...]
+                 * The space characters, for the purposes of this specification,
+                 * are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab),
+                 * U+000A LINE FEED (LF), U+000C FORM FEED (FF), and
+                 * U+000D CARRIAGE RETURN (CR).
+                 */
+                $language = substr($matches[1], 0, strcspn($matches[1], " \t\n\f\r"));
+
+                $class = 'language-'.$language;
 
                 $Element['attributes'] = array(
                     'class' => $class,