blob: aa4616ac0db047bebff0ceee61984e371994146f [file] [log] [blame]
<?php
/*
Plugin Name: WebKit Table of Contents
Plugin URI: http://webkit.org
Description: Builds a table of contents with navigation anchors from headings
Version: 1.0
Author: Jonathan Davis
*/
WebKitTableOfContents::init();
class WebKitTableOfContents {
private static $editing = false;
private static $toc = array();
private static $attr_regex = '\{((?:[ ]*[#.][-_:a-zA-Z0-9]+){1,})[ ]*\}';
public function init() {
add_filter( 'wp_insert_post_data', array( 'WebKitTableOfContents', 'wp_insert_post_data' ), 20, 2 );
add_action( 'wp_insert_post', array( 'WebKitTableOfContents', 'wp_insert_post' ) );
}
public static function hasIndex() {
$toc = get_post_meta( get_the_ID(), 'toc', true );
array_walk($toc, array('WebKitTableOfContents', 'filterIndex'));
return ( ! empty(self::$toc) && count(self::$toc) > 2 );
}
public static function filterIndex($value, $key) {
list($level, $anchor) = explode('::', $key);
if ( $level < 3 ) self::$toc[ $key ] = $value;
}
public static function renderMarkup() {
if ( ! is_page() ) return;
if ( empty(self::$toc) || ! self::hasIndex() )
return;
$depth = 0;
$parent = 0;
$markup = '<input type="checkbox" id="table-of-contents-toggle" class="menu-toggle"><menu class="table-of-contents"><menuitem class="list"><h6><label for="table-of-contents-toggle">Contents</label></h6>';
foreach ( self::$toc as $name => $heading ) {
list($level, $anchor) = explode('::', $name);
if ( empty($level) || $level > 3 ) continue;
if ( $level < $depth ) {
$markup .= str_repeat('</ul></li>', $depth - $level);
$depth = $level;
} elseif ( $level == $depth )
$markup .= '</li>';
if ( $level > $depth ) {
$markup .= '<ul class="level-' . $level . '">';
$depth = $level;
$parent = $depth;
}
$markup .= sprintf('<li><a href="#%s">%s</a>', $anchor, $heading);
}
$markup .= '</ul></menuitem></menu>';
return $markup;
}
public static function markup() {
echo self::renderMarkup();
}
public function wp_insert_post_data( $post_data, $record ) {
if ( ! in_array($post_data['post_type'], array('page')) )
return $post_data;
$post_data['post_content'] = self::parse($post_data['post_content']);
self::$editing = isset( $record['ID'] ) ? $record['ID'] : false;
return $post_data;
}
public static function wp_insert_post( $post_id ) {
if ( empty(self::$toc) ) return;
if ( self::$editing && self::$editing != $post_id ) return;
update_post_meta($post_id, 'toc', self::$toc);
}
public static function parse( $content ) {
$markup = preg_replace_callback('{
^<h([1-6])[^>]*>(.+?)<\/h[1-6]>* # HTML tags
}xm',
array('WebKitTableOfContents', 'index'),
$content
);
return $markup;
}
public static function index( $matches ) {
list($marked, $level, $heading) = $matches;
$heading = strip_tags($heading);
$anchor = sanitize_title_with_dashes($heading);
self::$toc[ "$level::$anchor" ] = $heading;
return sprintf('<h%2$d><a name="%1$s"></a>%3$s</h%2$d>', $anchor, $level, $heading);
}
}