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<?php
/*
* SPEEDYCACHE
* https://speedycache.com/
* (c) SpeedyCache Team
*/

namespace SpeedyCache;

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

class Enhanced{

static function init(){
		global $speedycache;
		
		$speedycache->enhanced = array();
		$speedycache->enhanced['html'] = '';
		$speedycache->enhanced['head_html'] = '';
		$speedycache->enhanced['body_html'] = '';
		$speedycache->enhanced['inline_scripts'] = '';
		$speedycache->enhanced['cache_speedycache_minified'] = '';
		$speedycache->enhanced['cache_speedycache_minified'] = 'cache/speedycache/'.SPEEDYCACHE_SERVER_HOST. '/assets';
	}
	
	// Removes white space after </html> & \r & any white space 
	static function remove_trailing_html_space($content){
		global $speedycache;
		
		$content = preg_replace("/<\/html>\s+/", '</html>', $content);
		$content = str_replace("\r", '', $content);
		return preg_replace("/^\s+/m", '', ((string) $content));
	}

static function remove_head_comments(){
		global $speedycache;
		
		$data = $speedycache->enhanced['head_html'];
		$comment_list = array();
		$comment_start_index = false;

for($i = 0; $i < strlen( $data ); $i++){
			if(isset($data[$i-3])){
				if($data[$i-3].$data[$i-2].$data[$i-1].$data[$i] == '<!--'){
					if(!preg_match("/if\s+|endif\s*\]/", substr($data, $i, 17))){
						$comment_start_index = $i-3;
					}
				}
			}

if(isset($data[$i-2])){
				if($comment_start_index){
					if($data[$i-2].$data[$i-1].$data[$i] == '-->'){
						array_push($comment_list, array('start' => $comment_start_index, 'end' => $i));
						$comment_start_index = false;
					}
				}
			}
		}

if(!empty($comment_list)){
			foreach(array_reverse($comment_list) as $key => $value){
				$data = substr_replace($data, '', $value['start'], ($value['end'] - $value['start'] + 1));
			}

$speedycache->enhanced['html'] = str_replace($speedycache->enhanced['head_html'], $data, $speedycache->enhanced['html']);
		}

return $speedycache->enhanced['html'];
	}

static function eliminate_newline($start_string, $end_string, $tmp_html){
		$data = $tmp_html;

$list = array();
		$start_index = false;
		$end_index = false;

for($i = 0; $i < strlen( $data ); $i++){
			if(substr($data, $i, strlen($start_string)) == $start_string){
				if(!$end_index){
					$start_index = $i;
				}
			}

if($start_index && $i > $start_index){
				if(substr($data, $i, strlen($end_string)) == $end_string){
					$end_index = $i + strlen($end_string) - 1;
					$text = substr($data, $start_index, ($end_index - $start_index + 1));
					
					array_push($list, array('start' => $start_index, 'end' => $end_index, 'text' => $text));

$start_index = false;
					$end_index = false;
				}
			}
		}

if(isset($list[0])){
			$list = array_reverse($list);

foreach($list as $key => $value){
				if(preg_match("/(<script|<style|<textarea)/i", $value['text'])){
					continue;
				}

//var $bodybg=$('<div id="ncf-body-bg"/>').prependTo($body);
				if(preg_match("/\)\.prependTo\(/i", $value['text'])){
					continue;
				}

//<div class="wp_syntax" style="position:relative;">
				if(preg_match("/<div\s+class\=\"wp\_syntax\"[^\>]*>/i", $value['text'])){
					continue;
				}

$value['text'] = preg_replace("/\s+/", " ", ((string)$value['text']));

$tmp_html = substr_replace($tmp_html, $value['text'], $value['start'], ($value['end'] - $value['start'] + 1));
			}
		}

return $tmp_html;
	}

static function minify_inline_css($data){
		global $speedycache;
		
		$style_list = array();
		$style_start_index = false;

for($i = 0; $i < strlen( $data ); $i++){
			if(isset($data[$i-5])){
				if(substr($data, $i - 5, 6) == '<style'){
					$style_start_index = $i - 5;
				}
			}

if(isset($data[$i-7])){
				if($style_start_index){
					if(substr($data, $i - 7, 8) == '</style>'){
						array_push($style_list, array('start' => $style_start_index, 'end' => $i));
						$style_start_index = false;
					}
				}
			}
		}

if(!empty($style_list)){
			foreach(array_reverse($style_list) as $key => $value){
				// document.write('<style type="text/css">div{}</style')
				$prev_20_chars = substr($data, $value['start'] - 20, 20);
				
				if(strpos($prev_20_chars, 'document.write') !== false){
					continue;
				}

$inline_style = substr($data, $value['start'], ($value['end'] - $value['start'] + 1));
				
				if(strlen($inline_style) > 15000){
					$part_of_inline_style = substr($inline_style, 0, 15000);
				}else{
					$part_of_inline_style = $inline_style;
				}

if(preg_match('/'.preg_quote($part_of_inline_style, '/').'/i', $speedycache->enhanced['inline_scripts'])){
					continue;
				}

if(preg_match("/<style\s+(amp-boilerplate|amp-custom)>/", $inline_style)){
					continue;	
				}

$inline_style = \SpeedyCache\Enhanced::minify_css($inline_style);

$inline_style = preg_replace("/\/\*(.*?)\*\//s", "\n", $inline_style); //replaces comments with \n
				$inline_style = preg_replace("/(<style[^\>]*>)\s+/i", "$1", $inline_style); //removes white space after <style> tag
				$inline_style = preg_replace("/\s+(<\/style[^\>]*>)/i", "$1", $inline_style); //removes white space before </style> tag

$inline_style = str_replace(' type="text/css"', '', $inline_style);
				$inline_style = str_replace(' type="text/css"', '', $inline_style);

$data = substr_replace($data, $inline_style, $value['start'], ($value['end'] - $value['start'] + 1));
			}
		}

return $data;
	}

static function remove_html_comments($data){
		$comment_list = array();
		$comment_start_index = false;

for($i = 0; $i < strlen($data); $i++){
			if(isset($data[$i-3])){
				if($data[$i-3].$data[$i-2].$data[$i-1].$data[$i] == "<!--"){
					if(!preg_match("/if\s+|endif\s*\]/", substr($data, $i, 17))){
						$comment_start_index = $i-3;
					}
				}
			}

if(!empty($comment_list)){
			foreach(array_reverse($comment_list) as $key => $value){
				if(($value['end'] - $value['start']) > 4){
					$comment_html = substr($data, $value['start'], ($value['end'] - $value['start'] + 1));

if(preg_match("/google\_ad\_slot/i", $comment_html)){
					}else{
						$data = substr_replace($data, '', $value['start'], ($value['end'] - $value['start'] + 1));
					}
				}
			}
		}

return $data;
	}

static function minify_html(&$content){
		global $speedycache;
		
		if(defined('SPEEDYCACHE_VERSION') && version_compare(SPEEDYCACHE_VERSION, '1.2.0', '<')){
			return $speedycache->enhanced['html'];
		}
		
		$tmp_html = $content;

$tmp_html = self::remove_trailing_html_space($tmp_html);
		$tmp_html = self::eliminate_newline('<div', '</div>', $tmp_html);
		$tmp_html = self::eliminate_newline('<li', '</li>', $tmp_html);

$tmp_html = self::minify_inline_js($tmp_html);
		$tmp_html = self::minify_inline_css($tmp_html);

$tmp_html = self::remove_html_comments($tmp_html);

$tag_list = 'p|div|span|img|nav|ul|li|header|a|b|i|article|section|footer|style|script|link|meta|body';

$tmp_html = preg_replace_callback("/\<(".$tag_list.")\s+[^\>\<]+\>/i", '\SpeedyCache\Enhanced::remove_spaces_in_tag', $tmp_html);
		$tmp_html = preg_replace('/\h+<\//', '</', $tmp_html);
		
		// BECAUSE of JsemÂ<span class="label">
		// - need to remove spaces between >  <
		// - need to remove spaces between <span>  Assdfdf </span>
		// $tmp_html = preg_replace("/\h*\<(".$tag_list.")\s+([^\>]+)>\h*/i", "<$1 $2>", $tmp_html);
		// $tmp_html = preg_replace("/\h*\<\/(".$tag_list.")>\h*/i", "</$1>", $tmp_html);
		$tmp_html = preg_replace("/\s*<\/div>\s*/is", "</div>", $tmp_html);
		
		$content = $tmp_html;
	}

static function search_in_inline_scripts($content){
		global $speedycache;
		
		if(strpos($speedycache->enhanced['inline_scripts'], $content) === false){
			return false;
		}
		
		return true;
	}

static function remove_spaces_in_tag($matches){
		if(self::search_in_inline_scripts($matches[0])){
			return $matches[0];
		}
		
		/**
		  * Structure of this array is
		  * searchable => replacer
		*/	
		$pregs_replaces = array(
			'/([\"\'])\s+\/>/' => '$1/>', //  <img id="1"  />
			'/\s+/' => ' ', // <div      id="1">
			'/\s+([\"\'])/' => '$1', // <div id="1  ">
			'/([a-z])\=([\"\'])\s+/' => '$1=$2', // <div id="  1"> <img src="data:image/gif;base64,R0lAICRAEAOw==" lazy="image.jpg" />
			'/\h*class\=\'\'\h*/' => ' ', // <ul class="">
			'/\h*class\=\"\"\h*/' => ' ', // <ul class=''>
		);
		
		foreach($pregs_replaces as $searchable => $replacer){
			$matches[0] = preg_replace($searchable, $replacer, $matches[0]);
		}

// <div style="">
		if(!preg_match("/id\=\"ctf_/", $matches[0])){
			/* 
			to exclude for Custom Twitter Feeds Pro Personal
			<div class="ctf-item ctf-author-msdsmarine ctf-new ctf-hide-avatar ctf-retweet ctf-tc-checked" id="ctf_1323705595325800448" style="">
			*/
			$matches[0] = preg_replace("/\h*style\=[\"\'][\"\']\h*/", " ", $matches[0]);
		}

// <div id="1"  >
		// <div  >
		$matches[0] = preg_replace("/\h+\>/", ">", $matches[0]);

// <script src='//bqcmw.js' type="text/javascript"></script>
		//$matches[0] = self::remove_type_attribute_for_js($matches[0]);

return $matches[0];
	}

static function remove_type_attribute_for_js($script){
		if(preg_match("/src\s*\=\s*[\"\']/", $script)){
			$script = preg_replace("/\stype\s*\=\s*[\'\"][^\"\']+[\'\"]/", " ", $script);
			$script = preg_replace("/\s+/", " ", $script);
			$script = preg_replace("/([\'\"])\s>/", "$1>", $script);
		}

return $script;
	}

static function remove_single_line_comments($html){
		$html = preg_replace("/).)+)-->/", '', $html);
		$html = preg_replace("/\/\*((?:(?!\*\/).)+)\*\//", '', $html);
		return $html;
	}

/* CSS Part Start */
	static function minify_css($source){
		$data = $source;
		$curl_list = array();
		$curl_start_index = false;

$curl_start_count = 0;
		$curl_end_count = 0;

for($i = 0; $i < strlen( $data ); $i++){
			if($data[$i] == '{'){
				$curl_start_count++;
				if(!$curl_start_index){
					$curl_start_index = $i;
				}
			}

if($data[$i] == '}'){
				// .icon-basic-printer:before{content:"}";}
				if(isset($data[$i+1]) && $data[$i+1] != "'" && $data[$i+1] != "'"){
					$curl_end_count++;
				}
			}

if($curl_start_count && $curl_start_count == $curl_end_count){
				array_push($curl_list, array('start' => $curl_start_index - 3, 'end' => $i + 3));

$curl_start_count = 0;
				$curl_end_count = 0;
				$curl_start_index = false;
			}
		}

if(!empty($curl_list)){
			foreach(array_reverse($curl_list) as $key => $value){
				$new_data = substr($data, $value['start'], ($value['end'] - $value['start'] + 1));

if(!preg_match("/[^\{]+\{[^\{]+\{/", $new_data)){
					$new_data = preg_replace("/\s+/", " ", ((string) $new_data));
					$new_data = preg_replace("/\s+}/", "}", $new_data); //removes white space before "}"
					$new_data = preg_replace("/}\s+/", "} ", $new_data); //removes white space after "}"
					$new_data = preg_replace("/\s*(\{|\;|\:)\s*/", "$1", $new_data);

$data = substr_replace($data, $new_data, $value['start'], ($value['end'] - $value['start'] + 1));

}else{
					$first = strpos($new_data, '{');
					$last = strrpos($new_data, '}');
					$new_data_tmp = substr($new_data, $first+1, $last-$first-1);
					$new_data_tmp = \SpeedyCache\Enhanced::minify_css($new_data_tmp);

$new_data = substr_replace($new_data, $new_data_tmp, $first+1, ($last-$first-1));

$data = substr_replace($data, $new_data, $value['start'], ($value['end'] - $value['start'] + 1));
				}
			}

$source = $data;
		}

//@media (max-width: 767px){
		$source = preg_replace("/\@media\s*$\s*(max-width|min-width)\s*\:\s*([^\($\{\}\s]+)\s*\)\s*\{/", "@media($1:$2){", $source);
		//@media (min-width: 768px) and (max-width: 1018px){
		$source = preg_replace("/\@media\s*$\s*(max-width|min-width)\s*\:\s*([^\($\{\}\s]+)\s*\)\s*and\s*$\s*(max-width|min-width)\s*\:\s*([^\($\{\}\s]+)\s*\)\s*\{/", "@media($1:$2) and ($3:$4){", $source);
		//@media screen and (max-width: 479px){
		$source = preg_replace("/\@media\s+screen\s+and\s*$\s*(max-width|min-width)\s*\:\s*([^\($\{\}\s]+)\s*\)\s*\{/", "@media screen and ($1:$2){", $source);

/*
		article,
		h2,
		div:first-child,
		.main{padding:0;}
		*/
		$source = preg_replace("/^([a-z0-9\_\.\-\:\>\s]+\,)\s+/im", "$1 ", $source);

return $source;

//$source = preg_replace_callback("/\s*\{((?:(?!content|\}).)+)\}\s*/", '\SpeedyCache\Enhanced::eliminate_newline_for_css'), $source);
		//return $source;
	}

// Regex to replace new line after \n /\s*\;(?:\s*|\n)/
	//Replaces Space before and after { } ; :
	static function eliminate_newline_for_css($matches){
		$matches[0] = preg_replace("/\s+/", " ", ((string) $matches[0]));
		$matches[0] = preg_replace("/\s*{\s*/", "{", $matches[0]);
		$matches[0] = preg_replace("/\s*}\s*/", "}", $matches[0]);
		$matches[0] = preg_replace("/\s*\;\s*/", ";", $matches[0]);
		$matches[0] = preg_replace("/\s*\:\s*/", ":", $matches[0]);

return $matches[0]."\n";
	}

static function render_blocking($html, $render_blocking_css = false){
		\SpeedyCache\RenderBlocking::init($html);
		return \SpeedyCache\RenderBlocking::action($render_blocking_css);
	}

static function google_fonts(){
		//for checking
	}

static function lazy_load($content){
		global $speedycache;

\SpeedyCache\LazyLoad::init();
		
		$funcs = array(
			'\SpeedyCache\LazyLoad::images',
			'\SpeedyCache\LazyLoad::iframe',
			'\SpeedyCache\LazyLoad::background',
			'\SpeedyCache\LazyLoad::video'
		);
		
		foreach($funcs as $fn){
			// if(!function_exists($fn)){
				// continue;
			// }

$fn_res = call_user_func_array($fn, array($content, $speedycache->enhanced['inline_scripts']));
			
			if(empty($fn_res)){
				continue;
			}
			
			$content = $fn_res;
		
		}
		
		return $content;
	}

/* CSS Part Start */

/* Js Part Start */
	// TODO:: not used anywhere
	static function single_line_js($source){
		$source = preg_replace("/\n/", '', $source);

return $source;
	}

static function minify_js($source, $inline_js = false){
		//$source = preg_replace("/\n\/\/.*/", "", $source);
		//$source = preg_replace("/\/\*.*?\*\//s", "", $source);

if(preg_match("/dynamicgoogletags\.update/i", $source)){
			$source = "<script>dynamicgoogletags.update();</script>";
			
			return $source;
		}

// <script>
		//   (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
		//   (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
		//   m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
		//   })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');

//   ga('create', 'UA-9999-9', 'auto');
		//   ga('send', 'pageview');
		// </script>
		if(preg_match("/<script[^\>]*>\s*$function\(i,s,o,g,r,a,m$\{i\[\'GoogleAnalyticsObject\'\]/i", $source)){
			if(preg_match("/ga$\'send\',\s*\'pageview\'$\;\s*<\/script>/i", $source)){
				$source = preg_replace("/\s+/", " ", ((string) $source));
				$source = preg_replace("/\s*<(\/?)script([^\>]*)>\s*/", "<$1script$2>", $source);

return $source;
			}
		}

// sometimes the lines are ended with "\r" instead of "\n"
		$source = str_replace("\r", "\n", $source);

$source = preg_replace("/^\s+/m", '', $source);

if(empty($inline_js)){
			// // --></script> in html
			//$source = preg_replace("/\n\/\/[^\n]+/", "", $source); // to remove single line comments
			$source = preg_replace_callback("/\n\/\/[^\n]+/", '\SpeedyCache\Enhanced::remove_single_line_comments_from_js', $source);
		}

if(!empty($inline_js)){
			if(preg_match("/var\sptsTables/i", $source) && preg_match("/var\sptsBuildConst/i", $source)){
			}
			//to remove only CDATA from inline js
			$source = preg_replace("/\/\*\s*\<\!\[CDATA\[\s*\*\//", "", $source);
			$source = preg_replace("/\/\*\s*\]\]\>\s*\*\//", "", $source);
		}

//<script>//alert();</script>
		if(preg_match("/<script[^\>]*>\s*\/\/[^\n]*<\/script>/i", $source)){
			return '';
		}
		
		$source = preg_replace_callback("/([a-z]{4,5}\:)?\/\/[^\n]*/", '\SpeedyCache\Enhanced::remove_single_line_comments_from_js', $source);

$source = preg_replace("/\}\)\;[^\S\r\n]+/",