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| <?php | |
| /*************************************************************** | |
| * CSS REMOVE UNUSED RULES CLASS | |
| * Run only in AMP pages | |
| * Auther: Mike Lange | |
| ************************************************************** | |
| HOW TO USE - BASIC: | |
| $tmp = new AmpRemoveUnusedCss(); | |
| $tmp->process($htmlcode); //must be full htmlcode, with <style amp-custom> tag and the <body> content | |
| echo $tmp->result(); | |
| HOW TO VIEW REPORT: | |
| $tmp = new AmpRemoveUnusedCss(1); //set 1 or TRUE to get full report, or void or 0 or FALSE to get simple report | |
| $tmp->process($htmlcode); | |
| echo $tmp->report(); | |
| ONLY MINIFY CSS (can be used in no-AMP pages, too) | |
| You also can just only minify CSS by calling (it removes useless white spaces, but it does not remove unused CSS rules): | |
| $tmp = new AmpRemoveUnusedCss(); | |
| $css_minified = $tmp->minify($css); | |
| TO-DO : process @media | |
| **************************************************************/ | |
| class AmpRemoveUnusedCss | |
| { | |
| private $include_selectors = array('div','span','a','p','body','ul','li','nav'); //this tags will be ignored in process | |
| private $rules_to_remove = array(); | |
| private $amphtml = ""; | |
| private $newline = "\n"; | |
| private $result = ""; | |
| private $stats = array(); | |
| private $fullstats = false; | |
| function __construct($fullstats=false) | |
| { | |
| $this->fullstats = $fullstats; | |
| } | |
| public function process($html, $newline = "\n") | |
| { | |
| $this->amphtml = $html; | |
| $this->newline = $newline; | |
| if($this->fullstats) | |
| $this->stats['source_length'] = strlen($html); | |
| //collect style rules that are not in html code | |
| $html = preg_replace_callback("#(<style amp-custom>)(.+)(</style>)#Usmi", array($this, '_amp_css_find_rules_callback'), $html); | |
| foreach($this->rules_to_remove as $rule=>$remove) | |
| { | |
| if(!$remove) | |
| unset($this->rules_to_remove[$rule]); | |
| } | |
| //remove only unused rules in css | |
| $html = preg_replace_callback("#(<style amp-custom>)(.+)(</style>)#Usmi", array($this, '_amp_remove_css_callback'), $html); | |
| $this->result = $html; | |
| } | |
| public function result() | |
| { | |
| return $this->result; | |
| } | |
| public function report($htmlformat=true) | |
| { | |
| $r = $htmlformat?"<pre><ul>":""; | |
| $tag = $htmlformat?"<li>":""; | |
| if(isset($this->stats['source_length'])) | |
| $r .= $tag."Source CSS length = ".$this->stats['source_length']."\n"; | |
| if(isset($this->stats['source_minified_length'])) | |
| $r .= $tag."After minify length = ".$this->stats['source_minified_length']."\n"; | |
| if(isset($this->stats['src_rules_to_remove'])) | |
| $r .= $tag."Removed rules by type = ".var_export($this->stats['src_rules_to_remove'], true)."\n"; | |
| if(isset($this->stats['num_rules_found'])) | |
| $r .= $tag . "Total rules in source = ".$this->stats['num_rules_found']."\n"; | |
| if(isset($this->stats['keywords_removed'])) | |
| $r .= $tag . "Keywords removed = ".$this->stats['keywords_removed']."\n"; | |
| if(isset($this->stats['lines_removed'])) | |
| $r .= $tag . "Complete CSS lines removed = ".$this->stats['lines_removed']."\n"; | |
| if(isset($this->stats['final_length'])) | |
| $r .= $tag . "Final length = ".$this->stats['final_length']."\n"; | |
| if(isset($this->stats['source_minified_length'])&&isset($this->stats['final_length'])) | |
| { | |
| $orig = $this->stats['source_minified_length']; | |
| $final = $this->stats['final_length']; | |
| $r .= $tag . "A total of ".($orig-$final)." characters removed (". round(10000*$final/($orig+.00001))/100 ."%)\n"; | |
| } | |
| if($this->fullstats && $this->rules_to_remove) | |
| { | |
| $r .= $tag . "CSS Rules that has been removed: \n " . implode("\n ", array_keys($this->rules_to_remove)); | |
| } | |
| $r .= $htmlformat?"</ul></pre>":""; | |
| return $r; | |
| } | |
| //1st STEP: FIND CSS RULES, by .class, by tag, and by #id | |
| function _amp_css_find_rules_callback($matches) | |
| { | |
| $css = $matches[2]; | |
| $css = preg_replace("/\!important/", "", $css); //remove !important because is not allowed in AMP | |
| $css = $this->minify( $css ); //we need minize here to get correct format | |
| if($this->fullstats) | |
| $this->stats['source_minified_length'] = strlen($css); | |
| preg_match_all("#@[^{]+{([^{}]+{[^}]*})*}|([\.\#a-z][^{]*{[^}]*})#m", $css, $rules); | |
| $selectors = array( | |
| 'cls'=> array('prefix'=>".", 'regex_css'=>"/\.([a-z][a-z0-9\-_]*)[^a-z0-9\-_]/Usim", 'find_in_html'=>"/<[^>]*\s+class=['\"]\s*(?:([^'\"]+)\b\s*)*['\"]/ism"), | |
| 'id'=> array('prefix'=>"#", 'regex_css'=>"/#([a-z][a-z0-9\-_]*)[^a-z0-9\-_]/im", 'find_in_html'=>"/<[^>]*\s+id=['\"]([^'\"]+)['\"]/im"), | |
| 'tags'=> array('prefix'=>"", 'regex_css'=>"/^([^\.#@:][a-z0-9\-_]*)\b/im", 'find_in_html'=>"/<([a-z][^\s><]*)\b/i") | |
| ); | |
| $items = array(); | |
| foreach($selectors as $selector=>$params) | |
| { | |
| preg_match_all($params['find_in_html'], $this->amphtml, $ids); | |
| if($selector=='cls') | |
| { | |
| $items[$selector] = array(); | |
| foreach($ids[1] as $classes) | |
| { | |
| $tmp = preg_split("/\s/", $classes, -1, PREG_SPLIT_NO_EMPTY); | |
| $items[$selector] = array_merge($items[$selector], $tmp); | |
| } | |
| } | |
| else | |
| $items[$selector] = $ids[1]; | |
| } | |
| //Remove count stats | |
| $n = array('tags'=>0, 'id'=>0, 'cls'=>0); | |
| $nrules = array(); | |
| $ids = array(); | |
| foreach($rules[0] as $x=>$rule) | |
| { | |
| $media = strpos($rule, "@"); | |
| if($media!==FALSE) continue; //TO-DO | |
| $pos = strpos($rule, "{"); | |
| if($pos===FALSE||$pos==0) continue; | |
| $leftrule = substr($rule, 0, $pos+1); | |
| $tmp = array(); | |
| $sels = preg_split("#[,\s]#", $leftrule, -1, PREG_SPLIT_NO_EMPTY); | |
| foreach($sels as $sel) | |
| { | |
| $sel .= "{"; | |
| $nrules[$sel] = 1; | |
| } | |
| } | |
| $string = implode("\n", array_keys($nrules)); | |
| foreach($selectors as $selector=>$params) | |
| { | |
| preg_match_all($params['regex_css'], $string, $tmp); | |
| $tmp[1] = array_unique($tmp[1]); | |
| $ids[$selector] = $tmp[1]; | |
| foreach($ids[$selector] as $j=>$id) | |
| { | |
| $token = $params['prefix'].$id; | |
| if(isset($this->rules_to_remove[$token])) continue; | |
| if(in_array($token, $this->include_selectors)) | |
| { | |
| $this->rules_to_remove[$token] = 0; | |
| continue; | |
| } | |
| if(!in_array($id, $items[$selector])) | |
| { | |
| $this->rules_to_remove[$token] = 1; | |
| $n[$selector]++; | |
| } | |
| else | |
| $this->rules_to_remove[$token] = 0; | |
| } | |
| } | |
| $this->stats['src_rules_to_remove']=$n; | |
| $this->stats['num_rules_found']=count($nrules); | |
| return $matches[1].$css.$matches[3]; //return minimized css | |
| } | |
| //2nd STEP: remove unused rules in CSS source | |
| private function _amp_remove_css_callback($matches) | |
| { | |
| $css = $matches[2]; | |
| preg_match_all("#@[a-z][^{]+{([^{}]+{[^}]*})*}|([\.\#a-z][^{]*{[^}]*})#im", $css, $rules); | |
| //stats | |
| $lineremoved = 0; | |
| $keyremoved = 0; | |
| foreach($rules[0] as $x=>$rule) | |
| { | |
| $media = strpos($rule, "@"); | |
| if($media!==FALSE) | |
| { | |
| //TO-DO | |
| } | |
| else | |
| { | |
| $pos = strpos($rule, "{"); | |
| $leftrule = substr($rule, 0, $pos); | |
| $rightrule = substr($rule, $pos); | |
| $rtmp = preg_split("#[,]#m", $leftrule, -1, PREG_SPLIT_NO_EMPTY); | |
| $found = false; | |
| foreach($rtmp as $i=>$trule) | |
| { | |
| $trule = trim($trule); | |
| $r = preg_split("/(?:[\s>]*)([#\.:]?[a-z][a-z0-9\-_]*)([\[\(].*[\]\)])?/i", $trule, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY); | |
| foreach($r as $id) | |
| { | |
| if(isset($this->rules_to_remove[$id])) | |
| { | |
| $found = true; | |
| unset($rtmp[$i]); | |
| $keyremoved++; | |
| } | |
| } | |
| } | |
| if(!$rtmp||!count($rtmp)) | |
| { | |
| unset($rules[0][$x]); | |
| $lineremoved++; | |
| } | |
| else | |
| { | |
| if($found) | |
| { | |
| $rules[0][$x] = implode(",", $rtmp). $rightrule; | |
| } | |
| } | |
| } | |
| } | |
| $this->stats['lines_removed'] = $lineremoved; | |
| $this->stats['keywords_removed'] = $lineremoved; | |
| $r = implode($this->newline,$rules[0]); | |
| $this->stats['final_length'] = strlen($r); | |
| return $matches[1].$r.$matches[3]; | |
| } | |
| private function minify( $css ) | |
| { | |
| $css = preg_replace( "#[\r\n]#m", ' ', $css ); | |
| $css = preg_replace('!/\*.*?\*/!s', '', $css); //strip comments | |
| $css = preg_replace( '#\s+#m', ' ', $css ); | |
| $css = preg_replace( '/-?\b0px/', '0', $css ); | |
| $css = str_replace( '; ', ';', $css ); | |
| $css = str_replace( ': ', ':', $css ); | |
| $css = preg_replace( '#\s*>\s*#', '>', $css ); | |
| $css = str_replace( ' {', '{', $css ); | |
| $css = str_replace( '{ ', '{', $css ); | |
| $css = str_replace( ', ', ',', $css ); | |
| $css = str_replace( '} ', '}', $css ); | |
| $css = str_replace( ' }', '}', $css ); | |
| $css = str_replace( ';}', '}', $css ); | |
| $css = str_replace(' )', ')', $css); | |
| $css = str_replace('( ', '(', $css); | |
| $css = preg_replace('/\bwhite([\s;}])\b/', '#fff$1', $css); //avoid change white-space keyword | |
| $css = preg_replace('/\bblack\b/', '#000', $css); | |
| $css = preg_replace('#(}+)#', "$1\n", $css); | |
| $css = trim($css); | |
| return $css; | |
| } | |
| } | |
| ?> |
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