From ba5140d2193ec3406e7e0bace16ca0d5917591c6 Mon Sep 17 00:00:00 2001
From: Ryan Boren <ryan@git.wordpress.org>
Date: Wed, 20 Aug 2008 23:48:09 +0000
Subject: [PATCH] comment_class(). Props sandbox theme. see #7560

git-svn-id: https://develop.svn.wordpress.org/trunk@8695 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-content/themes/classic/comments.php |  2 +-
 wp-content/themes/default/comments.php |  6 +--
 wp-includes/comment-template.php       | 64 ++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 4 deletions(-)

diff --git a/wp-content/themes/classic/comments.php b/wp-content/themes/classic/comments.php
index bf02bedd78..4f92f65f7f 100644
--- a/wp-content/themes/classic/comments.php
+++ b/wp-content/themes/classic/comments.php
@@ -12,7 +12,7 @@
 <ol id="commentlist">
 
 <?php foreach ($comments as $comment) : ?>
-	<li id="comment-<?php comment_ID() ?>">
+	<li <?php comment_class(); ?> id="comment-<?php comment_ID() ?>">
 	<?php echo get_avatar( $comment, 32 ); ?>
 	<?php comment_text() ?>
 	<p><cite><?php comment_type(__('Comment'), __('Trackback'), __('Pingback')); ?> <?php _e('by'); ?> <?php comment_author_link() ?> &#8212; <?php comment_date() ?> @ <a href="#comment-<?php comment_ID() ?>"><?php comment_time() ?></a></cite> <?php edit_comment_link(__("Edit This"), ' |'); ?></p>
diff --git a/wp-content/themes/default/comments.php b/wp-content/themes/default/comments.php
index ec2f6c4f5c..b28f49a054 100644
--- a/wp-content/themes/default/comments.php
+++ b/wp-content/themes/default/comments.php
@@ -14,7 +14,7 @@
 	}
 
 	/* This variable is for alternating comment background */
-	$oddcomment = 'class="alt" ';
+	$oddcomment = 'alt';
 ?>
 
 <!-- You can start editing here. -->
@@ -26,7 +26,7 @@
 
 	<?php foreach ($comments as $comment) : ?>
 
-		<li <?php echo $oddcomment; ?>id="comment-<?php comment_ID() ?>">
+		<li <?php comment_class($oddcomment) ?>id="comment-<?php comment_ID() ?>">
 			<?php echo get_avatar( $comment, 32 ); ?>
 			<cite><?php comment_author_link() ?></cite> Says:
 			<?php if ($comment->comment_approved == '0') : ?>
@@ -42,7 +42,7 @@
 
 	<?php
 		/* Changes every other comment to a different class */
-		$oddcomment = ( empty( $oddcomment ) ) ? 'class="alt" ' : '';
+		$oddcomment = ( empty( $oddcomment ) ) ? 'alt' : '';
 	?>
 
 	<?php endforeach; /* end for each comment */ ?>
diff --git a/wp-includes/comment-template.php b/wp-includes/comment-template.php
index 9f173a153b..956dc7d86a 100644
--- a/wp-includes/comment-template.php
+++ b/wp-includes/comment-template.php
@@ -218,6 +218,70 @@ function comment_author_url_link( $linktext = '', $before = '', $after = '' ) {
 	echo get_comment_author_url_link( $linktext, $before, $after );
 }
 
+/**
+ * Generates semantic classes for each comment element
+ *
+ * @since 2.7
+ *
+ * @param string|array $class One or more classes to add to the class list
+ * @param int $comment_id An optional comment ID
+ * @param int $post_id An optional post ID
+ */
+function comment_class( $class = '', $comment_id = null, $post_id = null ) {
+	// Separates classes with a single space, collates classes for post DIV
+	echo 'class="' . join( ' ', get_comment_class( $class, $comment_id, $post_id ) ) . '"';
+}
+
+/**
+ * Returns the classes for the comment div as an array
+ *
+ * @since 2.7
+ *
+ * @param string|array $class One or more classes to add to the class list
+ * @param int $comment_id An optional comment ID
+ * @param int $post_id An optional post ID
+ * @return array Array of classes
+ */
+function get_comment_class( $class = '', $comment_id = null, $post_id = null ) {
+	static $comment_alt;
+
+	$comment = get_comment($comment_id);
+
+	$classes = array();
+
+	// Get the comment type (comment, trackback),
+	$classes[] = $comment->comment_type;
+
+	// If the comment author has an id (registered), then print the log in name
+	if ( $comment->user_id > 0 && $user = get_userdata($comment->user_id) ) {
+		// For all registered users, 'byuser'
+		$classes[] = 'byuser comment-author-' . $user->user_nicename;
+		// For comment authors who are the author of the post
+		if ( $post = get_post($post_id) ) {
+			if ( $comment->user_id === $post->post_author )
+				$classes[] = 'bypostauthor';
+		}
+	}
+
+	if ( empty($comment_alt) )
+		$comment_alt = 0;
+
+	if ( $comment_alt % 2 )
+		$classes[] = 'odd';
+	else
+		$classes[] = 'even';
+
+	$comment_alt++;
+
+	if ( !empty($class) ) {
+		if ( !is_array( $class ) )
+			$class = preg_split('#\s+#', $class);
+		$classes = array_merge($classes, $class);
+	}
+
+	return apply_filters('comment_class', $classes, $class, $comment_id, $post_id);
+}
+
 /**
  * Retrieve the comment date of the current comment.
  *