/**
* OB callback
*
* @param string $buffer
* @return string
*/
function ob_callback($buffer)
{
if ($buffer != '' && Util_Content::is_html($buffer)) {
if ($this->can_minify2($buffer)) {
$this->minify_helpers = new _W3_MinifyHelpers($this->_config);
/**
* Replace script and style tags
*/
if (function_exists('is_feed') && !is_feed()) {
$head_prepend = '';
$body_prepend = '';
$body_append = '';
$embed_extsrcjs = false;
$buffer = apply_filters('w3tc_minify_before', $buffer);
if ($this->_config->get_boolean('minify.auto')) {
if ($this->_config->get_boolean('minify.js.enable')) {
$minifier = new _W3_MinifyJsAuto($this->_config, $buffer, $this->minify_helpers);
$buffer = $minifier->execute();
$this->replaced_scripts = $minifier->get_debug_minified_urls();
}
if ($this->_config->get_boolean('minify.css.enable')) {
$embed_to_html = $this->_config->get_boolean('minify.css.embed');
$ignore_css_files = $this->_config->get_array('minify.reject.files.css');
$files_to_minify = array();
$embed_pos = strpos($buffer, '<!-- W3TC-include-css -->');
$buffer = str_replace('<!-- W3TC-include-css -->', '', $buffer);
if ($embed_pos === false) {
if (preg_match('~<head(\\s+[^>]*)*>~Ui', $buffer, $match, PREG_OFFSET_CAPTURE)) {
$embed_pos = strlen($match[0][0]) + $match[0][1];
} else {
$embed_pos = 0;
}
}
$ignore_css_files = array_map(array('\\W3TC\\Util_Environment', 'normalize_file'), $ignore_css_files);
$handled_styles = array();
$style_tags = Minify_Extract::extract_css($buffer);
$previous_file_was_ignored = false;
foreach ($style_tags as $style_tag_tuple) {
$style_tag = $style_tag_tuple[0];
$style_len = strlen($style_tag);
$tag_pos = strpos($buffer, $style_tag);
$match = array();
$url = $style_tag_tuple[1];
if ($this->_config->get_boolean('minify.debug')) {
Minify_Core::log('adding ' . $url);
}
$url = Util_Environment::url_relative_to_full($url);
$file = Util_Environment::url_to_docroot_filename($url);
$do_tag_minification = $this->minify_helpers->is_file_for_minification($file) && !in_array($file, $handled_styles);
$do_tag_minification = apply_filters('w3tc_minify_css_do_tag_minification', $do_tag_minification, $style_tag, $file);
if (!$do_tag_minification) {
continue;
}
$handled_styles[] = $file;
$this->replaced_styles[] = $file;
if (in_array($file, $ignore_css_files)) {
if ($tag_pos > $embed_pos) {
if ($files_to_minify) {
$data = array('files_to_minify' => $files_to_minify, 'embed_pos' => $embed_pos, 'embed_to_html' => $embed_to_html);
$data = apply_filters('w3tc_minify_css_step', $data);
$style = $this->get_style_custom($data['files_to_minify'], $data['embed_to_html']);
$buffer = substr_replace($buffer, $style, $embed_pos, 0);
$files_to_minify = array();
$style_len = $style_len + strlen($style);
}
$embed_pos = $embed_pos + $style_len;
$previous_file_was_ignored = true;
}
} else {
$buffer = substr_replace($buffer, '', $tag_pos, $style_len);
if ($embed_pos > $tag_pos) {
$embed_pos -= $style_len;
} elseif ($previous_file_was_ignored) {
$embed_pos = $tag_pos;
}
$files_to_minify[] = $file;
}
}
$data = array('files_to_minify' => $files_to_minify, 'embed_pos' => $embed_pos, 'embed_to_html' => $embed_to_html);
$data = apply_filters('w3tc_minify_css_step', $data);
$style = $this->get_style_custom($data['files_to_minify'], $data['embed_to_html']);
$buffer = substr_replace($buffer, $style, $data['embed_pos'], 0);
}
$buffer = apply_filters('w3tc_minify_processed', $buffer);
} else {
if ($this->_config->get_boolean('minify.css.enable')) {
$style = $this->get_style_group('include');
if ($style) {
if ($this->_custom_location_does_not_exist('/<!-- W3TC-include-css -->/', $buffer, $style)) {
$head_prepend .= $style;
}
$this->remove_styles_group($buffer, 'include');
}
}
if ($this->_config->get_boolean('minify.js.enable')) {
$embed_type = $this->_config->get_string('minify.js.header.embed_type');
$script = $this->get_script_group('include', $embed_type);
if ($script) {
$embed_extsrcjs = $embed_type == 'extsrc' || $embed_type == 'asyncsrc' ? true : $embed_extsrcjs;
if ($this->_custom_location_does_not_exist('/<!-- W3TC-include-js-head -->/', $buffer, $script)) {
$head_prepend .= $script;
}
$this->remove_scripts_group($buffer, 'include');
}
$embed_type = $this->_config->get_string('minify.js.body.embed_type');
$script = $this->get_script_group('include-body', $embed_type);
if ($script) {
$embed_extsrcjs = $embed_type == 'extsrc' || $embed_type == 'asyncsrc' ? true : $embed_extsrcjs;
if ($this->_custom_location_does_not_exist('/<!-- W3TC-include-js-body-start -->/', $buffer, $script)) {
$body_prepend .= $script;
}
$this->remove_scripts_group($buffer, 'include-body');
}
$embed_type = $this->_config->get_string('minify.js.footer.embed_type');
$script = $this->get_script_group('include-footer', $embed_type);
if ($script) {
$embed_extsrcjs = $embed_type == 'extsrc' || $embed_type == 'asyncsrc' ? true : $embed_extsrcjs;
if ($this->_custom_location_does_not_exist('/<!-- W3TC-include-js-body-end -->/', $buffer, $script)) {
$body_append .= $script;
}
$this->remove_scripts_group($buffer, 'include-footer');
}
}
}
if ($head_prepend != '') {
$buffer = preg_replace('~<head(\\s+[^>]*)*>~Ui', '\\0' . $head_prepend, $buffer, 1);
}
if ($body_prepend != '') {
$buffer = preg_replace('~<body(\\s+[^>]*)*>~Ui', '\\0' . $body_prepend, $buffer, 1);
}
if ($body_append != '') {
$buffer = preg_replace('~<\\/body>~', $body_append . '\\0', $buffer, 1);
}
if ($embed_extsrcjs) {
$script = "\n<script type=\"text/javascript\">\n" . "var extsrc=null;\n" . '(function(){function j(){if(b&&g){document.write=k;document.writeln=l;var f=document.createElement("span");f.innerHTML=b;g.appendChild(f);b=""}}function d(){j();for(var f=document.getElementsByTagName("script"),c=0;c<f.length;c++){var e=f[c],h=e.getAttribute("asyncsrc");if(h){e.setAttribute("asyncsrc","");var a=document.createElement("script");a.async=!0;a.src=h;document.getElementsByTagName("head")[0].appendChild(a)}if(h=e.getAttribute("extsrc")){e.setAttribute("extsrc","");g=document.createElement("span");e.parentNode.insertBefore(g,e);document.write=function(a){b+=a};document.writeln=function(a){b+=a;b+="\\n"};a=document.createElement("script");a.async=!0;a.src=h;/msie/i.test(navigator.userAgent)&&!/opera/i.test(navigator.userAgent)?a.onreadystatechange=function(){("loaded"==this.readyState||"complete"==this.readyState)&&d()}:-1!=navigator.userAgent.indexOf("Firefox")||"onerror"in a?(a.onload=d,a.onerror=d):(a.onload=d,a.onreadystatechange=d);document.getElementsByTagName("head")[0].appendChild(a);return}}j();document.write=k;document.writeln=l;for(c=0;c<extsrc.complete.funcs.length;c++)extsrc.complete.funcs[c]()}function i(){arguments.callee.done||(arguments.callee.done=!0,d())}extsrc={complete:function(b){this.complete.funcs.push(b)}};extsrc.complete.funcs=[];var k=document.write,l=document.writeln,b="",g="";document.addEventListener&&document.addEventListener("DOMContentLoaded",i,!1);if(/WebKit/i.test(navigator.userAgent))var m=setInterval(function(){/loaded|complete/.test(document.readyState)&&(clearInterval(m),i())},10);window.onload=i})();' . "\n</script>\n";
$buffer = preg_replace('~<head(\\s+[^>]*)*>~Ui', '\\0' . $script, $buffer, 1);
}
}
/**
* Minify HTML/Feed
*/
if ($this->_config->get_boolean('minify.html.enable')) {
try {
$buffer = $this->minify_html($buffer);
} catch (\Exception $exception) {
$this->error = $exception->getMessage();
}
}
}
}
return $buffer;
}
/**
* Parse content and return CSS recommendations
*
* @param string $content
* @return array
*/
function get_recommendations_css($content)
{
$tag_files = Minify_Extract::extract_css($content);
$files = array();
foreach ($tag_files as $tag_file) {
$files[] = $tag_file[1];
}
$files = array_map(array('\\W3TC\\Util_Environment', 'normalize_file_minify'), $files);
$files = array_unique($files);
$ignore_files = $this->_config->get_array('minify.reject.files.css');
$files = array_diff($files, $ignore_files);
return $files;
}