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name : tableofcontent.php
 <?php

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

function siteseo_render_toc(){
	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', []);

	$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){
			$title = trim(strip_tags($heading->nodeValue));
			$id = $heading->getAttribute('id');
			$current_h = (int) substr($heading->tagName, 1);
			
			if(empty($id)){
				$id = '#'.siteseo_title_to_id($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
function siteseo_title_to_id($title){
	$id = trim(strip_tags($title));
	$id = remove_accents($title);
	$id = sanitize_title_with_dashes($id);
	$id = urlencode($id);

	return $id;
}

function siteseo_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){
			$title = trim(strip_tags($heading->nodeValue));
			$id = $heading->getAttribute('id');
			
			if(!empty($id)){
				continue;
			}
			
			if(empty($title)){
				continue;
			}
			
			$id = siteseo_title_to_id($title);

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

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

	return $content;

}
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