WordPress/wp-includes/comment-template.php

<?php
/**
 * Comment template functions
 *
 * These functions are meant to live inside of the WordPress loop.
 *
 * @package WordPress
 * @subpackage Template
 */

/**
 * get_comment_author() - Retrieve the author of the current comment
 *
 * If the comment has an empty comment_author field, then 'Anonymous' person
 * is assumed.
 *
 * @since 1.5
 * @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) )
		$author = __('Anonymous');
	else
		$author = $comment->comment_author;
	return apply_filters('get_comment_author', $author);
}

/**
 * comment_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;
}

/**
 * get_comment_author_email() - Retrieve the email of the author of the current comment
 *
 * @since 1.5
 * @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);
}

/**
 * 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() );
}

/**
 * comment_author_email_link() - 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
 * @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='') {
	global $comment;
	$email = apply_filters('comment_email', $comment->comment_author_email);
	if ((!empty($email)) && ($email != '@')) {
	$display = ($linktext != '') ? $linktext : $email;
		echo $before;
		echo "<a href='mailto:$email'>$display</a>";
		echo $after;
	}
}

/**
 * get_comment_author_link() - Retrieve the html link to the url of the author of the current comment
 *
 * @since 1.5
 * @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'>$author</a>";
	return apply_filters('get_comment_author_link', $return);
}

/**
 * comment_author_link() - 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();
}

/**
 * get_comment_author_IP() - Retrieve the IP address of the author of the current comment
 *
 * @since 1.5
 * @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);
}

/**
 * comment_author_IP() - Displays 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();
}

/**
 * get_comment_author_url() - Returns the url of the author of the current comment
 *
 * @since 1.5
 * @uses apply_filters() Calls 'get_comment_author_url' hook on the comment author's URL
 *
 * @return string
 */
function get_comment_author_url() {
	global $comment;
	return apply_filters('get_comment_author_url', $comment->comment_author_url);
}

/**
 * comment_author_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());
}

/**
 * get_comment_author_url_link() - 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
 * @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);
}

/**
 * comment_author_url_link() - 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 );
}

/**
 * get_comment_date() - Retrieve the comment date of the current comment
 *
 * @since 1.5
 * @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);
}

/**
 * comment_date() - 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 );
}

/**
 * get_comment_excerpt() - 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
 * @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);
}

/**
 * comment_excerpt() - Returns the excerpt of the current comment
 *
 * @since 1.2
 * @uses apply_filters() Calls 'comment_excerpt' hook before displaying excerpt
 */
function comment_excerpt() {
	echo apply_filters('comment_excerpt', get_comment_excerpt() );
}

/**
 * get_comment_ID() - Retrieve the comment id of the current comment
 *
 * @since 1.5
 * @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);
}

/**
 * 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();
}

/**
 * get_comment_link() - Retrieve the link to the current comment
 *
 * @since 1.5
 * @uses $comment
 *
 * @return string The permalink to the current comment
 */
function get_comment_link() {
	global $comment;
	return get_permalink( $comment->comment_post_ID ) . '#comment-' . $comment->comment_ID;
}

/**
 * get_comments_link() - Retrieves the link to the current post comments
 *
 * @since 1.5
 *
 * @return string The link to the comments
 */
function get_comments_link() {
	return get_permalink() . '#comments';
}

/**
 * comments_link() - Displays the link to the current post comments
 *
 * @since 0.71
 *
 * @param string $file Not Used
 * @param bool $echo Not Used
 */
function comments_link( $file = '', $echo = true ) {
	echo get_comments_link();
}

/**
 * get_comments_number() - Retrieve the amount of comments a post has
 *
 * @since 1.5
 * @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 ) {
	$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);
}

/**
 * comments_number() - 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, ( 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);
}

/**
 * get_comment_text() - Retrieve the text of the current comment
 *
 * @since 1.5
 * @uses $comment
 *
 * @return string The comment content
 */
function get_comment_text() {
	global $comment;
	return apply_filters('get_comment_text', $comment->comment_content);
}

/**
 * comment_text() - 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() );
}

/**
 * get_comment_time() - Retrieve the comment time of the current comment
 *
 * @since 1.5
 * @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
 * @return string The formatted time
 */
function get_comment_time( $d = '', $gmt = false ) {
	global $comment;
	$comment_date = $gmt? $comment->comment_date_gmt : $comment->comment_date;
	if ( '' == $d )
		$date = mysql2date(get_option('time_format'), $comment_date);
	else
		$date = mysql2date($d, $comment_date);
	return apply_filters('get_comment_time', $date, $d, $gmt);
}

/**
 * comment_time() - 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);
}

/**
 * get_comment_type() - Retrieve the comment type of the current comment
 *
 * @since 1.5
 * @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);
}

/**
 * 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 = 'Comment', $trackbacktxt = 'Trackback', $pingbacktxt = 'Pingback') {
	$type = get_comment_type();
	switch( $type ) {
		case 'trackback' :
			echo $trackbacktxt;
			break;
		case 'pingback' :
			echo $pingbacktxt;
			break;
		default :
			echo $commenttxt;
	}
}

/**
 * get_trackback_url() - 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
 * @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);
}

/**
 * trackback_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 $deprecated Remove backwards compat in 2.4
 * @return void|string Should only be used to echo the trackback URL, use get_trackback_url() for the result instead.
 */
function trackback_url($deprecated = true) {
	if ($deprecated) echo get_trackback_url();
	else return get_trackback_url();
}

/**
 * trackback_rdf() - Generates and displays the RDF for the trackback information of current post
 *
 * @since 0.71
 *
 * @param int $timezone Not used
 */
function trackback_rdf($timezone = 0) {
	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>';
	}
}

/**
 * comments_open() - Whether the current post is open for comments
 *
 * @since 1.5
 * @uses $post
 *
 * @return bool True if the comments are open
 */
function comments_open() {
	global $post;
	if ( 'open' == $post->comment_status )
		return true;
	else
		return false;
}

/**
 * pings_open() - Whether the current post is open for pings
 *
 * @since 1.5
 * @uses $post 
 *
 * @return bool True if pings are accepted
 */
function pings_open() {
	global $post;
	if ( 'open' == $post->ping_status )
		return true;
	else
		return false;
}

/**
 * wp_comment_form_unfiltered_html_nonce() - 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.
 *
 * @since 2.0.10 Backported to 2.0 branch
 * @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;
	if ( current_user_can('unfiltered_html') )
		wp_nonce_field('unfiltered-html-comment_' . $post->ID, '_wp_unfiltered_html_comment', false);
}

/**
 * comments_template() - 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
 * @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
 * @return null Returns null if no comments appear
 */
function comments_template( $file = '/comments.php' ) {
	global $wp_query, $withcomments, $post, $wpdb, $id, $comment, $user_login, $user_ID, $user_identity;

	if ( ! (is_single() || is_page() || $withcomments) )
		return;

	$req = get_option('require_name_email');
	$commenter = wp_get_current_commenter();
	extract($commenter, EXTR_SKIP);

	/** @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", $post->ID, $user_ID));
	} else if ( empty($comment_author) ) {
		$comments = $wpdb->get_results($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1' ORDER BY comment_date", $post->ID));
	} 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", $post->ID, $comment_author, $comment_author_email));
	}

	// keep $comments for legacy's sake (remember $table*? ;) )
	$comments = $wp_query->comments = apply_filters( 'comments_array', $comments, $post->ID );
	$wp_query->comment_count = count($wp_query->comments);
	update_comment_cache($comments);

	define('COMMENTS_TEMPLATE', true);
	$include = apply_filters('comments_template', TEMPLATEPATH . $file );
	if ( file_exists( $include ) )
		require( $include );
	else
		require( ABSPATH . 'wp-content/themes/default/comments.php');
}

/**
 * comments_popup_script() - 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;
}

/**
 * comments_popup_link() - 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 = 'No Comments', $one = '1 Comment', $more = '% Comments', $css_class = '', $none = 'Comments Off' ) {
	global $id, $wpcommentspopupfile, $wpcommentsjavascript, $post;

	if ( is_single() || is_page() )
		return;

	$number = get_comments_number( $id );

	if ( 0 == $number && 'closed' == $post->comment_status && 'closed' == $post->ping_status ) {
		echo '<span' . ((!empty($css_class)) ? ' class="' . $css_class . '"' : '') . '>' . $none . '</span>';
		return;
	}

	if ( !empty($post->post_password) ) { // if there's a password
		if ( $_COOKIE['wp-postpass_' . COOKIEHASH] != $post->post_password ) {  // and it doesn't match the cookie
			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 = attribute_escape( get_the_title() );
	
	echo apply_filters( 'comments_popup_link_attributes', '' );

	echo ' title="' . sprintf( __('Comment on %s'), $title ) . '">';
	comments_number( $zero, $one, $more, $number );
	echo '</a>';
}

?>