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//Enable HTML Compression | |
class WP_HTML_Compression | |
{ | |
// Settings | |
protected $compress_css = true; | |
protected $compress_js = true; | |
protected $info_comment = true; | |
protected $remove_comments = true; | |
// Variables | |
protected $html; | |
public function __construct($html) | |
{ | |
if (!empty($html)) | |
{ | |
$this->parseHTML($html); | |
} | |
} | |
public function __toString() | |
{ | |
return $this->html; | |
} | |
protected function bottomComment($raw, $compressed) | |
{ | |
$raw = strlen($raw); | |
$compressed = strlen($compressed); | |
$savings = ($raw-$compressed) / $raw * 100; | |
$savings = round($savings, 2); | |
return '<!--HTML compressed, size saved '.$savings.'%. From '.$raw.' bytes, now '.$compressed.' bytes-->'; | |
} | |
protected function minifyHTML($html) | |
{ | |
$pattern = '/<(?<script>script).*?<\/script\s*>|<(?<style>style).*?<\/style\s*>|<!(?<comment>--).*?-->|<(?<tag>[\/\w.:-]*)(?:".*?"|\'.*?\'|[^\'">]+)*>|(?<text>((<[^!\/\w.:-])?[^<]*)+)|/si'; | |
preg_match_all($pattern, $html, $matches, PREG_SET_ORDER); | |
$overriding = false; | |
$raw_tag = false; | |
// Variable reused for output | |
$html = ''; | |
foreach ($matches as $token) | |
{ | |
$tag = (isset($token['tag'])) ? strtolower($token['tag']) : null; | |
$content = $token[0]; | |
if (is_null($tag)) | |
{ | |
if ( !empty($token['script']) ) | |
{ | |
$strip = $this->compress_js; | |
} | |
else if ( !empty($token['style']) ) | |
{ | |
$strip = $this->compress_css; | |
} | |
else if ($content == '<!--wp-html-compression no compression-->') | |
{ | |
$overriding = !$overriding; | |
// Don't print the comment | |
continue; | |
} | |
else if ($this->remove_comments) | |
{ | |
if (!$overriding && $raw_tag != 'textarea') | |
{ | |
// Remove any HTML comments, except MSIE conditional comments | |
$content = preg_replace('/<!--(?!\s*(?:\[if [^\]]+]|<!|>))(?:(?!-->).)*-->/s', '', $content); | |
} | |
} | |
} | |
else | |
{ | |
if ($tag == 'pre' || $tag == 'textarea') | |
{ | |
$raw_tag = $tag; | |
} | |
else if ($tag == '/pre' || $tag == '/textarea') | |
{ | |
$raw_tag = false; | |
} | |
else | |
{ | |
if ($raw_tag || $overriding) | |
{ | |
$strip = false; | |
} | |
else | |
{ | |
$strip = true; | |
// Remove any empty attributes, except: | |
// action, alt, content, src | |
$content = preg_replace('/(\s+)(\w++(?<!\baction|\balt|\bcontent|\bsrc)="")/', '$1', $content); | |
// Remove any space before the end of self-closing XHTML tags | |
// JavaScript excluded | |
$content = str_replace(' />', '/>', $content); | |
} | |
} | |
} | |
if ($strip) | |
{ | |
$content = $this->removeWhiteSpace($content); | |
} | |
$html .= $content; | |
} | |
return $html; | |
} | |
public function parseHTML($html) | |
{ | |
$this->html = $this->minifyHTML($html); | |
if ($this->info_comment) | |
{ | |
$this->html .= "\n" . $this->bottomComment($html, $this->html); | |
} | |
} | |
protected function removeWhiteSpace($str) | |
{ | |
$str = str_replace("\t", ' ', $str); | |
$str = str_replace("\n", '', $str); | |
$str = str_replace("\r", '', $str); | |
while (stristr($str, ' ')) | |
{ | |
$str = str_replace(' ', ' ', $str); | |
} | |
return $str; | |
} | |
} | |
function wp_html_compression_finish($html) | |
{ | |
return new WP_HTML_Compression($html); | |
} | |
function wp_html_compression_start() | |
{ | |
ob_start('wp_html_compression_finish'); | |
} | |
add_action('get_header', 'wp_html_compression_start'); |
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