web/wp-includes/comment-template.php
changeset 136 bde1974c263b
child 194 32102edaa81b
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/wp-includes/comment-template.php	Wed Feb 03 15:37:20 2010 +0000
@@ -0,0 +1,1399 @@
+<?php
+/**
+ * Comment template functions
+ *
+ * These functions are meant to live inside of the WordPress loop.
+ *
+ * @package WordPress
+ * @subpackage Template
+ */
+
+/**
+ * Retrieve the author of the current comment.
+ *
+ * If the comment has an empty comment_author field, then 'Anonymous' person is
+ * assumed.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls 'get_comment_author' hook on the comment author
+ *
+ * @return string The comment author
+ */
+function get_comment_author() {
+	global $comment;
+	if ( empty($comment->comment_author) ) {
+		if (!empty($comment->user_id)){
+			$user=get_userdata($comment->user_id);
+			$author=$user->user_login;
+		} else {
+			$author = __('Anonymous');
+		}
+	} else {
+		$author = $comment->comment_author;
+	}
+	return apply_filters('get_comment_author', $author);
+}
+
+/**
+ * Displays the author of the current comment.
+ *
+ * @since 0.71
+ * @uses apply_filters() Calls 'comment_author' on comment author before displaying
+ */
+function comment_author() {
+	$author = apply_filters('comment_author', get_comment_author() );
+	echo $author;
+}
+
+/**
+ * Retrieve the email of the author of the current comment.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls the 'get_comment_author_email' hook on the comment author email
+ * @uses $comment
+ *
+ * @return string The current comment author's email
+ */
+function get_comment_author_email() {
+	global $comment;
+	return apply_filters('get_comment_author_email', $comment->comment_author_email);
+}
+
+/**
+ * Display the email of the author of the current global $comment.
+ *
+ * Care should be taken to protect the email address and assure that email
+ * harvesters do not capture your commentors' email address. Most assume that
+ * their email address will not appear in raw form on the blog. Doing so will
+ * enable anyone, including those that people don't want to get the email
+ * address and use it for their own means good and bad.
+ *
+ * @since 0.71
+ * @uses apply_filters() Calls 'author_email' hook on the author email
+ */
+function comment_author_email() {
+	echo apply_filters('author_email', get_comment_author_email() );
+}
+
+/**
+ * Display the html email link to the author of the current comment.
+ *
+ * Care should be taken to protect the email address and assure that email
+ * harvesters do not capture your commentors' email address. Most assume that
+ * their email address will not appear in raw form on the blog. Doing so will
+ * enable anyone, including those that people don't want to get the email
+ * address and use it for their own means good and bad.
+ *
+ * @since 0.71
+ * @uses apply_filters() Calls 'comment_email' hook for the display of the comment author's email
+ * @uses get_comment_author_email_link() For generating the link
+ * @global object $comment The current Comment row object
+ *
+ * @param string $linktext The text to display instead of the comment author's email address
+ * @param string $before The text or HTML to display before the email link.
+ * @param string $after The text or HTML to display after the email link.
+ */
+function comment_author_email_link($linktext='', $before='', $after='') {
+	if ( $link = get_comment_author_email_link( $linktext, $before, $after ) )
+		echo $link;
+}
+
+/**
+ * Return the html email link to the author of the current comment.
+ *
+ * Care should be taken to protect the email address and assure that email
+ * harvesters do not capture your commentors' email address. Most assume that
+ * their email address will not appear in raw form on the blog. Doing so will
+ * enable anyone, including those that people don't want to get the email
+ * address and use it for their own means good and bad.
+ *
+ * @since 2.7
+ * @uses apply_filters() Calls 'comment_email' hook for the display of the comment author's email
+ * @global object $comment The current Comment row object
+ *
+ * @param string $linktext The text to display instead of the comment author's email address
+ * @param string $before The text or HTML to display before the email link.
+ * @param string $after The text or HTML to display after the email link.
+ */
+function get_comment_author_email_link($linktext='', $before='', $after='') {
+	global $comment;
+	$email = apply_filters('comment_email', $comment->comment_author_email);
+	if ((!empty($email)) && ($email != '@')) {
+	$display = ($linktext != '') ? $linktext : $email;
+		$return  = $before;
+		$return .= "<a href='mailto:$email'>$display</a>";
+	 	$return .= $after;
+		return $return;
+	} else {
+		return '';
+	}
+}
+
+/**
+ * Retrieve the html link to the url of the author of the current comment.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls 'get_comment_author_link' hook on the complete link HTML or author
+ *
+ * @return string Comment Author name or HTML link for author's URL
+ */
+function get_comment_author_link() {
+	/** @todo Only call these functions when they are needed. Include in if... else blocks */
+	$url    = get_comment_author_url();
+	$author = get_comment_author();
+
+	if ( empty( $url ) || 'http://' == $url )
+		$return = $author;
+	else
+		$return = "<a href='$url' rel='external nofollow' class='url'>$author</a>";
+	return apply_filters('get_comment_author_link', $return);
+}
+
+/**
+ * Display the html link to the url of the author of the current comment.
+ *
+ * @since 0.71
+ * @see get_comment_author_link() Echos result
+ */
+function comment_author_link() {
+	echo get_comment_author_link();
+}
+
+/**
+ * Retrieve the IP address of the author of the current comment.
+ *
+ * @since 1.5.0
+ * @uses $comment
+ * @uses apply_filters()
+ *
+ * @return unknown
+ */
+function get_comment_author_IP() {
+	global $comment;
+	return apply_filters('get_comment_author_IP', $comment->comment_author_IP);
+}
+
+/**
+ * Display the IP address of the author of the current comment.
+ *
+ * @since 0.71
+ * @see get_comment_author_IP() Echos Result
+ */
+function comment_author_IP() {
+	echo get_comment_author_IP();
+}
+
+/**
+ * Retrieve the url of the author of the current comment.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls 'get_comment_author_url' hook on the comment author's URL
+ *
+ * @return string
+ */
+function get_comment_author_url() {
+	global $comment;
+	$url = ('http://' == $comment->comment_author_url) ? '' : $comment->comment_author_url;
+	$url = esc_url( $url, array('http', 'https') );
+	return apply_filters('get_comment_author_url', $url);
+}
+
+/**
+ * Display the url of the author of the current comment.
+ *
+ * @since 0.71
+ * @uses apply_filters()
+ * @uses get_comment_author_url() Retrieves the comment author's URL
+ */
+function comment_author_url() {
+	echo apply_filters('comment_url', get_comment_author_url());
+}
+
+/**
+ * Retrieves the HTML link of the url of the author of the current comment.
+ *
+ * $linktext parameter is only used if the URL does not exist for the comment
+ * author. If the URL does exist then the URL will be used and the $linktext
+ * will be ignored.
+ *
+ * Encapsulate the HTML link between the $before and $after. So it will appear
+ * in the order of $before, link, and finally $after.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls the 'get_comment_author_url_link' on the complete HTML before returning.
+ *
+ * @param string $linktext The text to display instead of the comment author's email address
+ * @param string $before The text or HTML to display before the email link.
+ * @param string $after The text or HTML to display after the email link.
+ * @return string The HTML link between the $before and $after parameters
+ */
+function get_comment_author_url_link( $linktext = '', $before = '', $after = '' ) {
+	$url = get_comment_author_url();
+	$display = ($linktext != '') ? $linktext : $url;
+	$display = str_replace( 'http://www.', '', $display );
+	$display = str_replace( 'http://', '', $display );
+	if ( '/' == substr($display, -1) )
+		$display = substr($display, 0, -1);
+	$return = "$before<a href='$url' rel='external'>$display</a>$after";
+	return apply_filters('get_comment_author_url_link', $return);
+}
+
+/**
+ * Displays the HTML link of the url of the author of the current comment.
+ *
+ * @since 0.71
+ * @see get_comment_author_url_link() Echos result
+ *
+ * @param string $linktext The text to display instead of the comment author's email address
+ * @param string $before The text or HTML to display before the email link.
+ * @param string $after The text or HTML to display after the email link.
+ */
+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 2.7.0
+ *
+ * @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
+ * @param bool $echo Whether comment_class should echo or return
+ */
+function comment_class( $class = '', $comment_id = null, $post_id = null, $echo = true ) {
+	// Separates classes with a single space, collates classes for comment DIV
+	$class = 'class="' . join( ' ', get_comment_class( $class, $comment_id, $post_id ) ) . '"';
+	if ( $echo)
+		echo $class;
+	else
+		return $class;
+}
+
+/**
+ * Returns the classes for the comment div as an array
+ *
+ * @since 2.7.0
+ *
+ * @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 ) {
+	global $comment_alt, $comment_depth, $comment_thread_alt;
+
+	$comment = get_comment($comment_id);
+
+	$classes = array();
+
+	// Get the comment type (comment, trackback),
+	$classes[] = ( empty( $comment->comment_type ) ) ? 'comment' : $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';
+		$classes[] = 'comment-author-' . sanitize_html_class($user->user_nicename, $comment->user_id);
+		// 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) )
+		$comment_alt = 0;
+	if ( empty($comment_depth) )
+		$comment_depth = 1;
+	if ( empty($comment_thread_alt) )
+		$comment_thread_alt = 0;
+
+	if ( $comment_alt % 2 ) {
+		$classes[] = 'odd';
+		$classes[] = 'alt';
+	} else {
+		$classes[] = 'even';
+	}
+
+	$comment_alt++;
+
+	// Alt for top-level comments
+	if ( 1 == $comment_depth ) {
+		if ( $comment_thread_alt % 2 ) {
+			$classes[] = 'thread-odd';
+			$classes[] = 'thread-alt';
+		} else {
+			$classes[] = 'thread-even';
+		}
+		$comment_thread_alt++;
+	}
+
+	$classes[] = "depth-$comment_depth";
+
+	if ( !empty($class) ) {
+		if ( !is_array( $class ) )
+			$class = preg_split('#\s+#', $class);
+		$classes = array_merge($classes, $class);
+	}
+
+	$classes = array_map('esc_attr', $classes);
+
+	return apply_filters('comment_class', $classes, $class, $comment_id, $post_id);
+}
+
+/**
+ * Retrieve the comment date of the current comment.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls 'get_comment_date' hook with the formated date and the $d parameter respectively
+ * @uses $comment
+ *
+ * @param string $d The format of the date (defaults to user's config)
+ * @return string The comment's date
+ */
+function get_comment_date( $d = '' ) {
+	global $comment;
+	if ( '' == $d )
+		$date = mysql2date(get_option('date_format'), $comment->comment_date);
+	else
+		$date = mysql2date($d, $comment->comment_date);
+	return apply_filters('get_comment_date', $date, $d);
+}
+
+/**
+ * Display the comment date of the current comment.
+ *
+ * @since 0.71
+ *
+ * @param string $d The format of the date (defaults to user's config)
+ */
+function comment_date( $d = '' ) {
+	echo get_comment_date( $d );
+}
+
+/**
+ * Retrieve the excerpt of the current comment.
+ *
+ * Will cut each word and only output the first 20 words with '...' at the end.
+ * If the word count is less than 20, then no truncating is done and no '...'
+ * will appear.
+ *
+ * @since 1.5.0
+ * @uses $comment
+ * @uses apply_filters() Calls 'get_comment_excerpt' on truncated comment
+ *
+ * @return string The maybe truncated comment with 20 words or less
+ */
+function get_comment_excerpt() {
+	global $comment;
+	$comment_text = strip_tags($comment->comment_content);
+	$blah = explode(' ', $comment_text);
+	if (count($blah) > 20) {
+		$k = 20;
+		$use_dotdotdot = 1;
+	} else {
+		$k = count($blah);
+		$use_dotdotdot = 0;
+	}
+	$excerpt = '';
+	for ($i=0; $i<$k; $i++) {
+		$excerpt .= $blah[$i] . ' ';
+	}
+	$excerpt .= ($use_dotdotdot) ? '...' : '';
+	return apply_filters('get_comment_excerpt', $excerpt);
+}
+
+/**
+ * Display the excerpt of the current comment.
+ *
+ * @since 1.2.0
+ * @uses apply_filters() Calls 'comment_excerpt' hook before displaying excerpt
+ */
+function comment_excerpt() {
+	echo apply_filters('comment_excerpt', get_comment_excerpt() );
+}
+
+/**
+ * Retrieve the comment id of the current comment.
+ *
+ * @since 1.5.0
+ * @uses $comment
+ * @uses apply_filters() Calls the 'get_comment_ID' hook for the comment ID
+ *
+ * @return int The comment ID
+ */
+function get_comment_ID() {
+	global $comment;
+	return apply_filters('get_comment_ID', $comment->comment_ID);
+}
+
+/**
+ * Displays the comment id of the current comment.
+ *
+ * @since 0.71
+ * @see get_comment_ID() Echos Result
+ */
+function comment_ID() {
+	echo get_comment_ID();
+}
+
+/**
+ * Retrieve the link to a given comment.
+ *
+ * @since 1.5.0
+ * @uses $comment
+ *
+ * @param object|string|int $comment Comment to retrieve.
+ * @param array $args Optional args.
+ * @return string The permalink to the given comment.
+ */
+function get_comment_link( $comment = null, $args = array() ) {
+	global $wp_rewrite, $in_comment_loop;
+
+	$comment = get_comment($comment);
+
+	// Backwards compat
+	if ( !is_array($args) ) {
+		$page = $args;
+		$args = array();
+		$args['page'] = $page;
+	}
+
+	$defaults = array( 'type' => 'all', 'page' => '', 'per_page' => '', 'max_depth' => '' );
+	$args = wp_parse_args( $args, $defaults );
+
+	if ( '' === $args['per_page'] && get_option('page_comments') )
+		$args['per_page'] = get_option('comments_per_page');
+
+	if ( empty($args['per_page']) ) {
+		$args['per_page'] = 0;
+		$args['page'] = 0;
+	}
+
+	if ( $args['per_page'] ) {
+		if ( '' == $args['page'] )
+			$args['page'] = ( !empty($in_comment_loop) ) ? get_query_var('cpage') : get_page_of_comment( $comment->comment_ID, $args );
+
+		if ( $wp_rewrite->using_permalinks() )
+			$link = user_trailingslashit( trailingslashit( get_permalink( $comment->comment_post_ID ) ) . 'comment-page-' . $args['page'], 'comment' );
+		else
+			$link = add_query_arg( 'cpage', $args['page'], get_permalink( $comment->comment_post_ID ) );
+	} else {
+		$link = get_permalink( $comment->comment_post_ID );
+	}
+
+	return apply_filters( 'get_comment_link', $link . '#comment-' . $comment->comment_ID, $comment, $args );
+}
+
+/**
+ * Retrieves the link to the current post comments.
+ *
+ * @since 1.5.0
+ *
+ * @return string The link to the comments
+ */
+function get_comments_link() {
+	return get_permalink() . '#comments';
+}
+
+/**
+ * Displays the link to the current post comments.
+ *
+ * @since 0.71
+ *
+ * @param string $deprecated Not Used
+ * @param bool $deprecated Not Used
+ */
+function comments_link( $deprecated = '', $deprecated = '' ) {
+	echo get_comments_link();
+}
+
+/**
+ * Retrieve the amount of comments a post has.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls the 'get_comments_number' hook on the number of comments
+ *
+ * @param int $post_id The Post ID
+ * @return int The number of comments a post has
+ */
+function get_comments_number( $post_id = 0 ) {
+	global $id;
+	$post_id = (int) $post_id;
+
+	if ( !$post_id )
+		$post_id = (int) $id;
+
+	$post = get_post($post_id);
+	if ( ! isset($post->comment_count) )
+		$count = 0;
+	else
+		$count = $post->comment_count;
+
+	return apply_filters('get_comments_number', $count, $post_id);
+}
+
+/**
+ * Display the language string for the number of comments the current post has.
+ *
+ * @since 0.71
+ * @uses $id
+ * @uses apply_filters() Calls the 'comments_number' hook on the output and number of comments respectively.
+ *
+ * @param string $zero Text for no comments
+ * @param string $one Text for one comment
+ * @param string $more Text for more than one comment
+ * @param string $deprecated Not used.
+ */
+function comments_number( $zero = false, $one = false, $more = false, $deprecated = '' ) {
+	global $id;
+	$number = get_comments_number($id);
+
+	if ( $number > 1 )
+		$output = str_replace('%', number_format_i18n($number), ( false === $more ) ? __('% Comments') : $more);
+	elseif ( $number == 0 )
+		$output = ( false === $zero ) ? __('No Comments') : $zero;
+	else // must be one
+		$output = ( false === $one ) ? __('1 Comment') : $one;
+
+	echo apply_filters('comments_number', $output, $number);
+}
+
+/**
+ * Retrieve the text of the current comment.
+ *
+ * @since 1.5.0
+ * @uses $comment
+ *
+ * @return string The comment content
+ */
+function get_comment_text() {
+	global $comment;
+	return apply_filters('get_comment_text', $comment->comment_content);
+}
+
+/**
+ * Displays the text of the current comment.
+ *
+ * @since 0.71
+ * @uses apply_filters() Passes the comment content through the 'comment_text' hook before display
+ * @uses get_comment_text() Gets the comment content
+ */
+function comment_text() {
+	echo apply_filters('comment_text', get_comment_text() );
+}
+
+/**
+ * Retrieve the comment time of the current comment.
+ *
+ * @since 1.5.0
+ * @uses $comment
+ * @uses apply_filter() Calls 'get_comment_time' hook with the formatted time, the $d parameter, and $gmt parameter passed.
+ *
+ * @param string $d Optional. The format of the time (defaults to user's config)
+ * @param bool $gmt Whether to use the GMT date
+ * @param bool $translate Whether to translate the time (for use in feeds)
+ * @return string The formatted time
+ */
+function get_comment_time( $d = '', $gmt = false, $translate = true ) {
+	global $comment;
+	$comment_date = $gmt ? $comment->comment_date_gmt : $comment->comment_date;
+	if ( '' == $d )
+		$date = mysql2date(get_option('time_format'), $comment_date, $translate);
+	else
+		$date = mysql2date($d, $comment_date, $translate);
+	return apply_filters('get_comment_time', $date, $d, $gmt, $translate);
+}
+
+/**
+ * Display the comment time of the current comment.
+ *
+ * @since 0.71
+ *
+ * @param string $d Optional. The format of the time (defaults to user's config)
+ */
+function comment_time( $d = '' ) {
+	echo get_comment_time($d);
+}
+
+/**
+ * Retrieve the comment type of the current comment.
+ *
+ * @since 1.5.0
+ * @uses $comment
+ * @uses apply_filters() Calls the 'get_comment_type' hook on the comment type
+ *
+ * @return string The comment type
+ */
+function get_comment_type() {
+	global $comment;
+
+	if ( '' == $comment->comment_type )
+		$comment->comment_type = 'comment';
+
+	return apply_filters('get_comment_type', $comment->comment_type);
+}
+
+/**
+ * Display the comment type of the current comment.
+ *
+ * @since 0.71
+ *
+ * @param string $commenttxt The string to display for comment type
+ * @param string $trackbacktxt The string to display for trackback type
+ * @param string $pingbacktxt The string to display for pingback type
+ */
+function comment_type($commenttxt = false, $trackbacktxt = false, $pingbacktxt = false) {
+    if ( false === $commenttxt ) $commenttxt = _x( 'Comment', 'noun' );
+    if ( false === $trackbacktxt ) $trackbacktxt = __( 'Trackback' );
+    if ( false === $pingbacktxt ) $pingbacktxt = __( 'Pingback' );
+	$type = get_comment_type();
+	switch( $type ) {
+		case 'trackback' :
+			echo $trackbacktxt;
+			break;
+		case 'pingback' :
+			echo $pingbacktxt;
+			break;
+		default :
+			echo $commenttxt;
+	}
+}
+
+/**
+ * Retrieve The current post's trackback URL.
+ *
+ * There is a check to see if permalink's have been enabled and if so, will
+ * retrieve the pretty path. If permalinks weren't enabled, the ID of the
+ * current post is used and appended to the correct page to go to.
+ *
+ * @since 1.5.0
+ * @uses apply_filters() Calls 'trackback_url' on the resulting trackback URL
+ * @uses $id
+ *
+ * @return string The trackback URL after being filtered
+ */
+function get_trackback_url() {
+	global $id;
+	if ( '' != get_option('permalink_structure') ) {
+		$tb_url = trailingslashit(get_permalink()) . user_trailingslashit('trackback', 'single_trackback');
+	} else {
+		$tb_url = get_option('siteurl') . '/wp-trackback.php?p=' . $id;
+	}
+	return apply_filters('trackback_url', $tb_url);
+}
+
+/**
+ * Displays the current post's trackback URL.
+ *
+ * @since 0.71
+ * @uses get_trackback_url() Gets the trackback url for the current post
+ *
+ * @param bool $deprecated Remove backwards compat in 2.5
+ * @return void|string Should only be used to echo the trackback URL, use get_trackback_url() for the result instead.
+ */
+function trackback_url($deprecated = true) {
+	if ($deprecated) echo get_trackback_url();
+	else return get_trackback_url();
+}
+
+/**
+ * Generates and displays the RDF for the trackback information of current post.
+ *
+ * @since 0.71
+ *
+ * @param int $deprecated Not used (Was $timezone = 0)
+ */
+function trackback_rdf($deprecated = '') {
+	if (stripos($_SERVER['HTTP_USER_AGENT'], 'W3C_Validator') === false) {
+		echo '<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+				xmlns:dc="http://purl.org/dc/elements/1.1/"
+				xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
+			<rdf:Description rdf:about="';
+		the_permalink();
+		echo '"'."\n";
+		echo '    dc:identifier="';
+		the_permalink();
+		echo '"'."\n";
+		echo '    dc:title="'.str_replace('--', '&#x2d;&#x2d;', wptexturize(strip_tags(get_the_title()))).'"'."\n";
+		echo '    trackback:ping="'.get_trackback_url().'"'." />\n";
+		echo '</rdf:RDF>';
+	}
+}
+
+/**
+ * Whether the current post is open for comments.
+ *
+ * @since 1.5.0
+ * @uses $post
+ *
+ * @param int $post_id An optional post ID to check instead of the current post.
+ * @return bool True if the comments are open
+ */
+function comments_open( $post_id=NULL ) {
+
+	$_post = get_post($post_id);
+
+	$open = ( 'open' == $_post->comment_status );
+	return apply_filters( 'comments_open', $open, $post_id );
+}
+
+/**
+ * Whether the current post is open for pings.
+ *
+ * @since 1.5.0
+ * @uses $post
+ *
+ * @param int $post_id An optional post ID to check instead of the current post.
+ * @return bool True if pings are accepted
+ */
+function pings_open( $post_id = NULL ) {
+
+	$_post = get_post($post_id);
+
+	$open = ( 'open' == $_post->ping_status );
+	return apply_filters( 'pings_open', $open, $post_id );
+}
+
+/**
+ * Displays form token for unfiltered comments.
+ *
+ * Will only display nonce token if the current user has permissions for
+ * unfiltered html. Won't display the token for other users.
+ *
+ * The function was backported to 2.0.10 and was added to versions 2.1.3 and
+ * above. Does not exist in versions prior to 2.0.10 in the 2.0 branch and in
+ * the 2.1 branch, prior to 2.1.3. Technically added in 2.2.0.
+ *
+ * Backported to 2.0.10.
+ *
+ * @since 2.1.3
+ * @uses $post Gets the ID of the current post for the token
+ */
+function wp_comment_form_unfiltered_html_nonce() {
+	global $post;
+
+	$post_id = 0;
+	if ( !empty($post) )
+		$post_id = $post->ID;
+
+	if ( current_user_can('unfiltered_html') )
+		wp_nonce_field('unfiltered-html-comment_' . $post_id, '_wp_unfiltered_html_comment', false);
+}
+
+/**
+ * Loads the comment template specified in $file.
+ *
+ * Will not display the comments template if not on single post or page, or if
+ * the post does not have comments.
+ *
+ * Uses the WordPress database object to query for the comments. The comments
+ * are passed through the 'comments_array' filter hook with the list of comments
+ * and the post ID respectively.
+ *
+ * The $file path is passed through a filter hook called, 'comments_template'
+ * which includes the TEMPLATEPATH and $file combined. Tries the $filtered path
+ * first and if it fails it will require the default comment themplate from the
+ * default theme. If either does not exist, then the WordPress process will be
+ * halted. It is advised for that reason, that the default theme is not deleted.
+ *
+ * @since 1.5.0
+ * @global array $comment List of comment objects for the current post
+ * @uses $wpdb
+ * @uses $id
+ * @uses $post
+ * @uses $withcomments Will not try to get the comments if the post has none.
+ *
+ * @param string $file Optional, default '/comments.php'. The file to load
+ * @param bool $separate_comments Optional, whether to separate the comments by comment type. Default is false.
+ * @return null Returns null if no comments appear
+ */
+function comments_template( $file = '/comments.php', $separate_comments = false ) {
+	global $wp_query, $withcomments, $post, $wpdb, $id, $comment, $user_login, $user_ID, $user_identity, $overridden_cpage;
+
+	if ( !(is_single() || is_page() || $withcomments) || empty($post) )
+		return;
+
+	if ( empty($file) )
+		$file = '/comments.php';
+
+	$req = get_option('require_name_email');
+
+	/**
+	 * Comment author information fetched from the comment cookies.
+	 *
+	 * @uses wp_get_current_commenter()
+	 */
+	$commenter = wp_get_current_commenter();
+
+	/**
+	 * The name of the current comment author escaped for use in attributes.
+	 */
+	$comment_author = $commenter['comment_author']; // Escaped by sanitize_comment_cookies()
+
+	/**
+	 * The email address of the current comment author escaped for use in attributes.
+	 */
+	$comment_author_email = $commenter['comment_author_email'];  // Escaped by sanitize_comment_cookies()
+
+	/**
+	 * The url of the current comment author escaped for use in attributes.
+	 */
+	$comment_author_url = esc_url($commenter['comment_author_url']);
+
+	/** @todo Use API instead of SELECTs. */
+	if ( $user_ID) {
+		$comments = $wpdb->get_results($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND (comment_approved = '1' OR ( user_id = %d AND comment_approved = '0' ) )  ORDER BY comment_date_gmt", $post->ID, $user_ID));
+	} else if ( empty($comment_author) ) {
+		$comments = get_comments( array('post_id' => $post->ID, 'status' => 'approve', 'order' => 'ASC') );
+	} else {
+		$comments = $wpdb->get_results($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND ( comment_approved = '1' OR ( comment_author = %s AND comment_author_email = %s AND comment_approved = '0' ) ) ORDER BY comment_date_gmt", $post->ID, wp_specialchars_decode($comment_author,ENT_QUOTES), $comment_author_email));
+	}
+
+	// keep $comments for legacy's sake
+	$wp_query->comments = apply_filters( 'comments_array', $comments, $post->ID );
+	$comments = &$wp_query->comments;
+	$wp_query->comment_count = count($wp_query->comments);
+	update_comment_cache($wp_query->comments);
+
+	if ( $separate_comments ) {
+		$wp_query->comments_by_type = &separate_comments($comments);
+		$comments_by_type = &$wp_query->comments_by_type;
+	}
+
+	$overridden_cpage = FALSE;
+	if ( '' == get_query_var('cpage') && get_option('page_comments') ) {
+		set_query_var( 'cpage', 'newest' == get_option('default_comments_page') ? get_comment_pages_count() : 1 );
+		$overridden_cpage = TRUE;
+	}
+
+	if ( !defined('COMMENTS_TEMPLATE') || !COMMENTS_TEMPLATE)
+		define('COMMENTS_TEMPLATE', true);
+
+	$include = apply_filters('comments_template', STYLESHEETPATH . $file );
+	if ( file_exists( $include ) )
+		require( $include );
+	elseif ( file_exists( TEMPLATEPATH . $file ) )
+		require( TEMPLATEPATH .  $file );
+	else
+		require( get_theme_root() . '/default/comments.php');
+}
+
+/**
+ * Displays the JS popup script to show a comment.
+ *
+ * If the $file parameter is empty, then the home page is assumed. The defaults
+ * for the window are 400px by 400px.
+ *
+ * For the comment link popup to work, this function has to be called or the
+ * normal comment link will be assumed.
+ *
+ * @since 0.71
+ * @global string $wpcommentspopupfile The URL to use for the popup window
+ * @global int $wpcommentsjavascript Whether to use JavaScript or not. Set when function is called
+ *
+ * @param int $width Optional. The width of the popup window
+ * @param int $height Optional. The height of the popup window
+ * @param string $file Optional. Sets the location of the popup window
+ */
+function comments_popup_script($width=400, $height=400, $file='') {
+	global $wpcommentspopupfile, $wpcommentsjavascript;
+
+	if (empty ($file)) {
+		$wpcommentspopupfile = '';  // Use the index.
+	} else {
+		$wpcommentspopupfile = $file;
+	}
+
+	$wpcommentsjavascript = 1;
+	$javascript = "<script type='text/javascript'>\nfunction wpopen (macagna) {\n    window.open(macagna, '_blank', 'width=$width,height=$height,scrollbars=yes,status=yes');\n}\n</script>\n";
+	echo $javascript;
+}
+
+/**
+ * Displays the link to the comments popup window for the current post ID.
+ *
+ * Is not meant to be displayed on single posts and pages. Should be used on the
+ * lists of posts
+ *
+ * @since 0.71
+ * @uses $id
+ * @uses $wpcommentspopupfile
+ * @uses $wpcommentsjavascript
+ * @uses $post
+ *
+ * @param string $zero The string to display when no comments
+ * @param string $one The string to display when only one comment is available
+ * @param string $more The string to display when there are more than one comment
+ * @param string $css_class The CSS class to use for comments
+ * @param string $none The string to display when comments have been turned off
+ * @return null Returns null on single posts and pages.
+ */
+function comments_popup_link( $zero = false, $one = false, $more = false, $css_class = '', $none = false ) {
+	global $id, $wpcommentspopupfile, $wpcommentsjavascript, $post;
+
+    if ( false === $zero ) $zero = __( 'No Comments' );
+    if ( false === $one ) $one = __( '1 Comment' );
+    if ( false === $more ) $more = __( '% Comments' );
+    if ( false === $none ) $none = __( 'Comments Off' );
+
+	$number = get_comments_number( $id );
+
+	if ( 0 == $number && !comments_open() && !pings_open() ) {
+		echo '<span' . ((!empty($css_class)) ? ' class="' . esc_attr( $css_class ) . '"' : '') . '>' . $none . '</span>';
+		return;
+	}
+
+	if ( post_password_required() ) {
+		echo __('Enter your password to view comments');
+		return;
+	}
+
+	echo '<a href="';
+	if ( $wpcommentsjavascript ) {
+		if ( empty( $wpcommentspopupfile ) )
+			$home = get_option('home');
+		else
+			$home = get_option('siteurl');
+		echo $home . '/' . $wpcommentspopupfile . '?comments_popup=' . $id;
+		echo '" onclick="wpopen(this.href); return false"';
+	} else { // if comments_popup_script() is not in the template, display simple comment link
+		if ( 0 == $number )
+			echo get_permalink() . '#respond';
+		else
+			comments_link();
+		echo '"';
+	}
+
+	if ( !empty( $css_class ) ) {
+		echo ' class="'.$css_class.'" ';
+	}
+	$title = the_title_attribute( 'echo=0' );
+
+	echo apply_filters( 'comments_popup_link_attributes', '' );
+
+	echo ' title="' . esc_attr( sprintf( __('Comment on %s'), $title ) ) . '">';
+	comments_number( $zero, $one, $more, $number );
+	echo '</a>';
+}
+
+/**
+ * Retrieve HTML content for reply to comment link.
+ *
+ * The default arguments that can be override are 'add_below', 'respond_id',
+ * 'reply_text', 'login_text', and 'depth'. The 'login_text' argument will be
+ * used, if the user must log in or register first before posting a comment. The
+ * 'reply_text' will be used, if they can post a reply. The 'add_below' and
+ * 'respond_id' arguments are for the JavaScript moveAddCommentForm() function
+ * parameters.
+ *
+ * @since 2.7.0
+ *
+ * @param array $args Optional. Override default options.
+ * @param int $comment Optional. Comment being replied to.
+ * @param int $post Optional. Post that the comment is going to be displayed on.
+ * @return string|bool|null Link to show comment form, if successful. False, if comments are closed.
+ */
+function get_comment_reply_link($args = array(), $comment = null, $post = null) {
+	global $user_ID;
+
+	$defaults = array('add_below' => 'comment', 'respond_id' => 'respond', 'reply_text' => __('Reply'),
+		'login_text' => __('Log in to Reply'), 'depth' => 0, 'before' => '', 'after' => '');
+
+	$args = wp_parse_args($args, $defaults);
+
+	if ( 0 == $args['depth'] || $args['max_depth'] <= $args['depth'] )
+		return;
+
+	extract($args, EXTR_SKIP);
+
+	$comment = get_comment($comment);
+	$post = get_post($post);
+
+	if ( !comments_open($post->ID) )
+		return false;
+
+	$link = '';
+
+	if ( get_option('comment_registration') && !$user_ID )
+		$link = '<a rel="nofollow" class="comment-reply-login" href="' . esc_url( wp_login_url( get_permalink() ) ) . '">' . $login_text . '</a>';
+	else
+		$link = "<a rel='nofollow' class='comment-reply-link' href='" . esc_url( add_query_arg( 'replytocom', $comment->comment_ID ) ) . "#" . $respond_id . "' onclick='return addComment.moveForm(\"$add_below-$comment->comment_ID\", \"$comment->comment_ID\", \"$respond_id\", \"$post->ID\")'>$reply_text</a>";
+	return apply_filters('comment_reply_link', $before . $link . $after, $args, $comment, $post);
+}
+
+/**
+ * Displays the HTML content for reply to comment link.
+ *
+ * @since 2.7.0
+ * @see get_comment_reply_link() Echoes result
+ *
+ * @param array $args Optional. Override default options.
+ * @param int $comment Optional. Comment being replied to.
+ * @param int $post Optional. Post that the comment is going to be displayed on.
+ * @return string|bool|null Link to show comment form, if successful. False, if comments are closed.
+ */
+function comment_reply_link($args = array(), $comment = null, $post = null) {
+	echo get_comment_reply_link($args, $comment, $post);
+}
+
+/**
+ * Retrieve HTML content for reply to post link.
+ *
+ * The default arguments that can be override are 'add_below', 'respond_id',
+ * 'reply_text', 'login_text', and 'depth'. The 'login_text' argument will be
+ * used, if the user must log in or register first before posting a comment. The
+ * 'reply_text' will be used, if they can post a reply. The 'add_below' and
+ * 'respond_id' arguments are for the JavaScript moveAddCommentForm() function
+ * parameters.
+ *
+ * @since 2.7.0
+ *
+ * @param array $args Optional. Override default options.
+ * @param int|object $post Optional. Post that the comment is going to be displayed on.  Defaults to current post.
+ * @return string|bool|null Link to show comment form, if successful. False, if comments are closed.
+ */
+function get_post_reply_link($args = array(), $post = null) {
+	global $user_ID;
+
+	$defaults = array('add_below' => 'post', 'respond_id' => 'respond', 'reply_text' => __('Leave a Comment'),
+		'login_text' => __('Log in to leave a Comment'), 'before' => '', 'after' => '');
+
+	$args = wp_parse_args($args, $defaults);
+	extract($args, EXTR_SKIP);
+	$post = get_post($post);
+
+	if ( !comments_open($post->ID) )
+		return false;
+
+	if ( get_option('comment_registration') && !$user_ID ) {
+		$link = '<a rel="nofollow" href="' . wp_login_url( get_permalink() ) . '">' . $login_text . '</a>';
+	} else {
+		$link = "<a rel='nofollow' class='comment-reply-link' href='" . get_permalink($post->ID) . "#$respond_id' onclick='return addComment.moveForm(\"$add_below-$post->ID\", \"0\", \"$respond_id\", \"$post->ID\")'>$reply_text</a>";
+	}
+	return apply_filters('post_comments_link', $before . $link . $after, $post);
+}
+
+/**
+ * Displays the HTML content for reply to post link.
+ * @since 2.7.0
+ * @see get_post_reply_link()
+ *
+ * @param array $args Optional. Override default options.
+ * @param int|object $post Optional. Post that the comment is going to be displayed on.
+ * @return string|bool|null Link to show comment form, if successful. False, if comments are closed.
+ */
+function post_reply_link($args = array(), $post = null) {
+	echo get_post_reply_link($args, $post);
+}
+
+/**
+ * Retrieve HTML content for cancel comment reply link.
+ *
+ * @since 2.7.0
+ *
+ * @param string $text Optional. Text to display for cancel reply link.
+ */
+function get_cancel_comment_reply_link($text = '') {
+	if ( empty($text) )
+		$text = __('Click here to cancel reply.');
+
+	$style = isset($_GET['replytocom']) ? '' : ' style="display:none;"';
+	$link = esc_html( remove_query_arg('replytocom') ) . '#respond';
+	return apply_filters('cancel_comment_reply_link', '<a rel="nofollow" id="cancel-comment-reply-link" href="' . $link . '"' . $style . '>' . $text . '</a>', $link, $text);
+}
+
+/**
+ * Display HTML content for cancel comment reply link.
+ *
+ * @since 2.7.0
+ *
+ * @param string $text Optional. Text to display for cancel reply link.
+ */
+function cancel_comment_reply_link($text = '') {
+	echo get_cancel_comment_reply_link($text);
+}
+
+/**
+ * Output hidden input HTML for replying to comments.
+ *
+ * @since 2.7.0
+ */
+function comment_id_fields() {
+	global $id;
+
+	$replytoid = isset($_GET['replytocom']) ? (int) $_GET['replytocom'] : 0;
+	echo "<input type='hidden' name='comment_post_ID' value='$id' id='comment_post_ID' />\n";
+	echo "<input type='hidden' name='comment_parent' id='comment_parent' value='$replytoid' />\n";
+}
+
+/**
+ * Display text based on comment reply status. Only affects users with Javascript disabled.
+ *
+ * @since 2.7.0
+ *
+ * @param string $noreplytext Optional. Text to display when not replying to a comment.
+ * @param string $replytext Optional. Text to display when replying to a comment. Accepts "%s" for the author of the comment being replied to.
+ * @param string $linktoparent Optional. Boolean to control making the author's name a link to their comment.
+ */
+function comment_form_title( $noreplytext = false, $replytext = false, $linktoparent = TRUE ) {
+	global $comment;
+
+	if ( false === $noreplytext ) $noreplytext = __( 'Leave a Reply' );
+	if ( false === $replytext ) $replytext = __( 'Leave a Reply to %s' );
+
+	$replytoid = isset($_GET['replytocom']) ? (int) $_GET['replytocom'] : 0;
+
+	if ( 0 == $replytoid )
+		echo $noreplytext;
+	else {
+		$comment = get_comment($replytoid);
+		$author = ( $linktoparent ) ? '<a href="#comment-' . get_comment_ID() . '">' . get_comment_author() . '</a>' : get_comment_author();
+		printf( $replytext, $author );
+	}
+}
+
+/**
+ * HTML comment list class.
+ *
+ * @package WordPress
+ * @uses Walker
+ * @since unknown
+ */
+class Walker_Comment extends Walker {
+	/**
+	 * @see Walker::$tree_type
+	 * @since unknown
+	 * @var string
+	 */
+	var $tree_type = 'comment';
+
+	/**
+	 * @see Walker::$db_fields
+	 * @since unknown
+	 * @var array
+	 */
+	var $db_fields = array ('parent' => 'comment_parent', 'id' => 'comment_ID');
+
+	/**
+	 * @see Walker::start_lvl()
+	 * @since unknown
+	 *
+	 * @param string $output Passed by reference. Used to append additional content.
+	 * @param int $depth Depth of comment.
+	 * @param array $args Uses 'style' argument for type of HTML list.
+	 */
+	function start_lvl(&$output, $depth, $args) {
+		$GLOBALS['comment_depth'] = $depth + 1;
+
+		switch ( $args['style'] ) {
+			case 'div':
+				break;
+			case 'ol':
+				echo "<ol class='children'>\n";
+				break;
+			default:
+			case 'ul':
+				echo "<ul class='children'>\n";
+				break;
+		}
+	}
+
+	/**
+	 * @see Walker::end_lvl()
+	 * @since unknown
+	 *
+	 * @param string $output Passed by reference. Used to append additional content.
+	 * @param int $depth Depth of comment.
+	 * @param array $args Will only append content if style argument value is 'ol' or 'ul'.
+	 */
+	function end_lvl(&$output, $depth, $args) {
+		$GLOBALS['comment_depth'] = $depth + 1;
+
+		switch ( $args['style'] ) {
+			case 'div':
+				break;
+			case 'ol':
+				echo "</ol>\n";
+				break;
+			default:
+			case 'ul':
+				echo "</ul>\n";
+				break;
+		}
+	}
+
+	/**
+	 * @see Walker::start_el()
+	 * @since unknown
+	 *
+	 * @param string $output Passed by reference. Used to append additional content.
+	 * @param object $comment Comment data object.
+	 * @param int $depth Depth of comment in reference to parents.
+	 * @param array $args
+	 */
+	function start_el(&$output, $comment, $depth, $args) {
+		$depth++;
+		$GLOBALS['comment_depth'] = $depth;
+
+		if ( !empty($args['callback']) ) {
+			call_user_func($args['callback'], $comment, $args, $depth);
+			return;
+		}
+
+		$GLOBALS['comment'] = $comment;
+		extract($args, EXTR_SKIP);
+
+		if ( 'div' == $args['style'] ) {
+			$tag = 'div';
+			$add_below = 'comment';
+		} else {
+			$tag = 'li';
+			$add_below = 'div-comment';
+		}
+?>
+		<<?php echo $tag ?> <?php comment_class(empty( $args['has_children'] ) ? '' : 'parent') ?> id="comment-<?php comment_ID() ?>">
+		<?php if ( 'div' != $args['style'] ) : ?>
+		<div id="div-comment-<?php comment_ID() ?>" class="comment-body">
+		<?php endif; ?>
+		<div class="comment-author vcard">
+		<?php if ($args['avatar_size'] != 0) echo get_avatar( $comment, $args['avatar_size'] ); ?>
+		<?php printf(__('<cite class="fn">%s</cite> <span class="says">says:</span>'), get_comment_author_link()) ?>
+		</div>
+<?php if ($comment->comment_approved == '0') : ?>
+		<em><?php _e('Your comment is awaiting moderation.') ?></em>
+		<br />
+<?php endif; ?>
+
+		<div class="comment-meta commentmetadata"><a href="<?php echo htmlspecialchars( get_comment_link( $comment->comment_ID ) ) ?>"><?php printf(__('%1$s at %2$s'), get_comment_date(),  get_comment_time()) ?></a><?php edit_comment_link(__('(Edit)'),'&nbsp;&nbsp;','') ?></div>
+
+		<?php comment_text() ?>
+
+		<div class="reply">
+		<?php comment_reply_link(array_merge( $args, array('add_below' => $add_below, 'depth' => $depth, 'max_depth' => $args['max_depth']))) ?>
+		</div>
+		<?php if ( 'div' != $args['style'] ) : ?>
+		</div>
+		<?php endif; ?>
+<?php
+	}
+
+	/**
+	 * @see Walker::end_el()
+	 * @since unknown
+	 *
+	 * @param string $output Passed by reference. Used to append additional content.
+	 * @param object $comment
+	 * @param int $depth Depth of comment.
+	 * @param array $args
+	 */
+	function end_el(&$output, $comment, $depth, $args) {
+		if ( !empty($args['end-callback']) ) {
+			call_user_func($args['end-callback'], $comment, $args, $depth);
+			return;
+		}
+		if ( 'div' == $args['style'] )
+			echo "</div>\n";
+		else
+			echo "</li>\n";
+	}
+
+}
+
+/**
+ * List comments
+ *
+ * Used in the comments.php template to list comments for a particular post
+ *
+ * @since 2.7.0
+ * @uses Walker_Comment
+ *
+ * @param string|array $args Formatting options
+ * @param array $comments Optional array of comment objects.  Defaults to $wp_query->comments
+ */
+function wp_list_comments($args = array(), $comments = null ) {
+	global $wp_query, $comment_alt, $comment_depth, $comment_thread_alt, $overridden_cpage, $in_comment_loop;
+
+	$in_comment_loop = true;
+
+	$comment_alt = $comment_thread_alt = 0;
+	$comment_depth = 1;
+
+	$defaults = array('walker' => null, 'max_depth' => '', 'style' => 'ul', 'callback' => null, 'end-callback' => null, 'type' => 'all',
+		'page' => '', 'per_page' => '', 'avatar_size' => 32, 'reverse_top_level' => null, 'reverse_children' => '');
+
+	$r = wp_parse_args( $args, $defaults );
+
+	// Figure out what comments we'll be looping through ($_comments)
+	if ( null !== $comments ) {
+		$comments = (array) $comments;
+		if ( empty($comments) )
+			return;
+		if ( 'all' != $r['type'] ) {
+			$comments_by_type = &separate_comments($comments);
+			if ( empty($comments_by_type[$r['type']]) )
+				return;
+			$_comments = $comments_by_type[$r['type']];
+		} else {
+			$_comments = $comments;
+		}
+	} else {
+		if ( empty($wp_query->comments) )
+			return;
+		if ( 'all' != $r['type'] ) {
+			if ( empty($wp_query->comments_by_type) )
+				$wp_query->comments_by_type = &separate_comments($wp_query->comments);
+			if ( empty($wp_query->comments_by_type[$r['type']]) )
+				return;
+			$_comments = $wp_query->comments_by_type[$r['type']];
+		} else {
+			$_comments = $wp_query->comments;
+		}
+	}
+
+	if ( '' === $r['per_page'] && get_option('page_comments') )
+		$r['per_page'] = get_query_var('comments_per_page');
+
+	if ( empty($r['per_page']) ) {
+		$r['per_page'] = 0;
+		$r['page'] = 0;
+	}
+
+	if ( '' === $r['max_depth'] ) {
+		if ( get_option('thread_comments') )
+			$r['max_depth'] = get_option('thread_comments_depth');
+		else
+			$r['max_depth'] = -1;
+	}
+
+	if ( '' === $r['page'] ) {
+		if ( empty($overridden_cpage) ) {
+			$r['page'] = get_query_var('cpage');
+		} else {
+			$threaded = ( -1 == $r['max_depth'] ) ? false : true;
+			$r['page'] = ( 'newest' == get_option('default_comments_page') ) ? get_comment_pages_count($_comments, $r['per_page'], $threaded) : 1;
+			set_query_var( 'cpage', $r['page'] );
+		}
+	}
+	// Validation check
+	$r['page'] = intval($r['page']);
+	if ( 0 == $r['page'] && 0 != $r['per_page'] )
+		$r['page'] = 1;
+
+	if ( null === $r['reverse_top_level'] )
+		$r['reverse_top_level'] = ( 'desc' == get_option('comment_order') ) ? TRUE : FALSE;
+
+	extract( $r, EXTR_SKIP );
+
+	if ( empty($walker) )
+		$walker = new Walker_Comment;
+
+	$walker->paged_walk($_comments, $max_depth, $page, $per_page, $r);
+	$wp_query->max_num_comment_pages = $walker->max_pages;
+
+	$in_comment_loop = false;
+}
+
+?>