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File Content: `tableofcontent.php`

<?php
/*
* SITESEO
* https://siteseo.io
* (c) SiteSEO Team
*/

namespace SiteSEO;

if(!defined('ABSPATH')){
	die('HACKING ATTEMPT!');
}

use DOMDocument;
use DOMXPath;

class TableofContent{
	
	static function enable_toc(){
        global $siteseo;

        if(empty($siteseo->setting_enabled['toggle-advanced']) || empty($siteseo->advanced_settings['toc_enable'])){
            return;
        }

        add_filter('the_content', '\SiteSEO\TableofContent::add_ids_to_headings');
    }

	static function render_toc(){
		global $siteseo;
		
		if(empty($siteseo->setting_enabled['toggle-advanced']) || empty($siteseo->advanced_settings['toc_enable'])){
			return;
		}

		static $siteseo_toc_run = false;

		if(!empty($siteseo_toc_run)){
			return '<p style="padding: 1rem; background-color:#fff3cd; color:#664d03; border:1px solid #ffe69c; border-radius: 0.375rem">'.esc_html__('Table of content shortcode can be used only once on a page, this page is using the shortcode more than once. Please remove the extra table of content shortcodes for this warning to go away.', 'siteseo').'</p>';
		}

		$options = get_option('siteseo_advanced_option_name');
		//$options = $siteseo->advanced_settings;
		
		$content = get_the_content();

		if(empty($content)){
			return;
		}

		$heading_type = (!empty($options['toc_heading_type']) ? $options['toc_heading_type'] : 'ul');

		$dom = new DOMDocument();
		$internalErrors = libxml_use_internal_errors(true);
		$dom->preserveWhiteSpace = false;

		$html = '';

		if($dom->loadHTML('<?xml encoding="utf-8" ?>' . $content)){
			$xpath = new DOMXPath($dom);

			$heading_list = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'];
			
			$headings_to_scan = [];
			foreach($heading_list as $h){
				if(!empty($options['toc_excluded_headings']) && is_array($options['toc_excluded_headings']) && in_array($h, $options['toc_excluded_headings'])){
					continue;
				}

				$headings_to_scan[] = '//'.$h;
			}

			if(empty($headings_to_scan)){
				return;
			}

			$headings_to_scan = implode('|', $headings_to_scan);
			
			// The imploded string will look like this //h1|//h2|//h3|//h4|//h5|//h6 
			$headings = $xpath->query($headings_to_scan);

			if(empty($headings)){
				return;
			}

			$last_h = 0;
			$open_ul = 0;
			
			$html .= '<style>.siteseo-toc-wrapper { padding: 20px; border: 1px solid #a2a9b1; background-color: #f8f9fa;}.siteseo-toc-wrapper p { display:flex; align-items:center; gap: 10px; font-size: 1.5rem; font-weight: 500; margin: 0 0 10px 0;}.siteseo-toc-wrapper > '.esc_html($heading_type).' { margin: 0; padding: 0;}.siteseo-toc-wrapper p>label { font-weight: 400; font-size: 0.9rem;}#siteseo-toc-toggle~span { cursor: pointer;}#siteseo-toc-toggle:checked~.siteseo-toc-hide,p:has(#siteseo-toc-toggle:checked) ~ '.esc_html($heading_type).' { display: none;}#siteseo-toc-toggle:not(:checked) ~ .siteseo-toc-hide{ display: inline;}#siteseo-toc-toggle:not(:checked) ~ .siteseo-toc-show { display: none;}</style>
			<div class="siteseo-toc-wrapper">
			<p>'.(!empty($options['toc_label']) ? esc_html($options['toc_label']) : esc_html__('Table of Content', 'siteseo')).' <label for="siteseo-toc-toggle">
			<input type="checkbox" style="display:none;" id="siteseo-toc-toggle" name="siteseo-toc-toggle"/>
			[<span class="siteseo-toc-hide">hide</span><span class="siteseo-toc-show">show</span>]</label></p>
			<'.esc_html($heading_type).'>';

			foreach($headings as $heading){
				$title = trim(wp_strip_all_tags($heading->nodeValue));
				$id = $heading->getAttribute('id');
				$current_h = (int) substr($heading->tagName, 1);
				
				if(empty($id)){
					$id = '#'.self::title_to_id($title);
				}else{
					$id = '#'.$id;
				}

				if($current_h > $last_h){				
					$html .= '<'.esc_html($heading_type).'>';
					$open_ul++;
				}else{
					while($current_h <= $open_ul){
						$html .= '</'.esc_html($heading_type).'>';
						$open_ul--;
					}
				}

				$html .= '<li><a href="'.esc_attr($id).'">'.esc_html($title).'</a></li>';
				$last_h = $current_h;
			}

			$html .= '</'.esc_html($heading_type).'></div>';
			
			$siteseo_toc_run = true;
		}

		return $html;
	}

	// Converts heading text content to ID to be used as link
	static function title_to_id($title){
		
		$id = trim(wp_strip_all_tags($title));
		$id = remove_accents($title);
		$id = sanitize_title_with_dashes($id);
		$id = urlencode($id);

		return $id;
	}

	static function add_ids_to_headings($content){

		if(empty($content)){
			return $content;
		}

		// If the page does not have the shortcode then we don't need to update the id's in the heading.
		if(!has_shortcode($content, 'siteseo_toc')){
			return $content;
		}
		
		$dom = new DOMDocument();
		$internalErrors = libxml_use_internal_errors(true);
		$dom->preserveWhiteSpace = false;

		$html = '';

		if($dom->loadHTML('<?xml encoding="utf-8" ?>' . $content)){
			$xpath = new DOMXPath($dom);

			$headings = $xpath->query('//h1|//h2|//h3|//h4|//h5|//h6');

			if(empty($headings)){
				return;
			}

			foreach($headings as $heading){
				$title = trim(wp_strip_all_tags($heading->nodeValue));
				$id = $heading->getAttribute('id');
				
				if(!empty($id)){
					continue;
				}
				
				if(empty($title)){
					continue;
				}
				
				$id = self::title_to_id($title);

				$heading->setAttribute('id', $id);
			}

			$content = $dom->saveHTML($dom->documentElement);
		}

		return $content;

	}

}
Name	Size	Permission
metaboxes	---	0755
settings	---	0755
admin.php	23616 bytes	0644
advanced.php	7020 bytes	0644
ajax.php	22145 bytes	0644
columns.php	5279 bytes	0644
generatesitemap.php	25537 bytes	0644
googleanalytics.php	26347 bytes	0644
imageseo.php	3114 bytes	0644
import.php	38829 bytes	0644
install.php	5823 bytes	0644
instantindexing.php	9068 bytes	0644
primarycategory.php	2665 bytes	0644
socialmetas.php	29213 bytes	0644
tableofcontent.php	5383 bytes	0644
titlesmetas.php	32850 bytes	0644
File Content: tableofcontent.php

File Content: `tableofcontent.php`
