/**
  * Remove script tags from the source
  *
  * @param string $content
  * @param array $files
  * @return void
  */
 function remove_scripts(&$content, $files)
 {
     $regexps = array();
     $home_url_regexp = w3_get_home_url_regexp();
     $path = '';
     if (w3_is_network() && !w3_is_subdomain_install()) {
         $path = ltrim(w3_get_home_path(), '/');
     }
     foreach ($files as $file) {
         if ($path && strpos($file, $path) === 0) {
             $file = substr($file, strlen($path));
         }
         $this->replaced_scripts[] = $file;
         if (w3_is_url($file) && !preg_match('~' . $home_url_regexp . '~i', $file)) {
             // external JS files
             $regexps[] = w3_preg_quote($file);
         } else {
             // local JS files
             $file = ltrim($file, '/');
             if (ltrim(w3_get_site_path(), '/') && strpos($file, ltrim(w3_get_site_path(), '/')) === 0) {
                 $file = str_replace(ltrim(w3_get_site_path(), '/'), '', $file);
             }
             $file = ltrim(preg_replace('~' . $home_url_regexp . '~i', '', $file), '/\\');
             $regexps[] = '(' . $home_url_regexp . ')?/?' . w3_preg_quote($file);
         }
     }
     foreach ($regexps as $regexp) {
         $content = preg_replace('~<script\\s+[^<>]*src=["\']?' . $regexp . '["\']?[^<>]*>\\s*</script>~Uis', '', $content);
     }
 }

 /**
  * Generate rules related to prevent for media 404 error by WP
  *
  * @return string
  */
 function generate_rules_no404wp_nginx()
 {
     $cssjs_types = $this->_get_cssjs_types();
     $html_types = $this->_get_html_types();
     $other_types = $this->_get_other_types();
     $extensions = array_merge(array_keys($cssjs_types), array_keys($html_types), array_keys($other_types));
     $permalink_structure = get_option('permalink_structure');
     $permalink_structure_ext = ltrim(strrchr($permalink_structure, '.'), '.');
     if ($permalink_structure_ext != '') {
         foreach ($extensions as $index => $extension) {
             if (strstr($extension, $permalink_structure_ext) !== false) {
                 $extensions[$index] = preg_replace('~\\|?' . w3_preg_quote($permalink_structure_ext) . '\\|?~', '', $extension);
             }
         }
     }
     $exceptions = $this->_config->get_array('browsercache.no404wp.exceptions');
     $rules = '';
     $rules .= W3TC_MARKER_BEGIN_BROWSERCACHE_NO404WP . "\n";
     $rules .= "if (-f \$request_filename) {\n";
     $rules .= "    break;\n";
     $rules .= "}\n";
     $rules .= "if (-d \$request_filename) {\n";
     $rules .= "    break;\n";
     $rules .= "}\n";
     if (count($exceptions)) {
         $rules .= "if (\$request_uri ~ \"(" . implode('|', $exceptions) . ")\") {\n";
         $rules .= "    break;\n";
         $rules .= "}\n";
     }
     $rules .= "if (\$request_uri ~* \\.(" . implode('|', $extensions) . ")\$) {\n";
     $rules .= "    return 404;\n";
     $rules .= "}\n";
     $rules .= W3TC_MARKER_END_BROWSERCACHE_NO404WP . "\n";
     return $rules;
 }

 /**
  * Remove script tags from the source
  *
  * @param string $content
  * @param array $files
  * @return void
  */
 function remove_scripts(&$content, $files)
 {
     $regexps = array();
     $domain_url_regexp = w3_get_domain_url_regexp();
     foreach ($files as $file) {
         $this->replaced_scripts[] = $file;
         if (w3_is_url($file) && !preg_match('~' . $domain_url_regexp . '~i', $file)) {
             // external JS files
             $regexps[] = w3_preg_quote($file);
         } else {
             // local JS files
             $file = ltrim(preg_replace('~' . $domain_url_regexp . '~i', '', $file), '/\\');
             $regexps[] = '(' . $domain_url_regexp . ')?/?' . w3_preg_quote($file);
         }
     }
     foreach ($regexps as $regexp) {
         $content = preg_replace('~<script\\s+[^<>]*src=["\']?' . $regexp . '["\']?[^<>]*>\\s*</script>~Uis', '', $content);
     }
 }

 /**
  * Rewrite a file relative URI as root relative
  *
  * <code>
  * Minify_CSS_UriRewriter::rewriteRelative(
  *       '../img/hello.gif'
  *     , '/home/user/www/css'  // path of CSS file
  *     , '/home/user/www'      // doc root
  * );
  * // returns '/img/hello.gif'
  *
  * // example where static files are stored in a symlinked directory
  * Minify_CSS_UriRewriter::rewriteRelative(
  *       'hello.gif'
  *     , '/var/staticFiles/theme'
  *     , '/home/user/www'
  *     , array('/home/user/www/static' => '/var/staticFiles')
  * );
  * // returns '/static/theme/hello.gif'
  * </code>
  *
  * @param string $uri file relative URI
  *
  * @param string $realCurrentDir realpath of the current file's directory.
  *
  * @param string $realDocRoot realpath of the site document root.
  *
  * @param array $symlinks (default = array()) If the file is stored in
  * a symlink-ed directory, provide an array of link paths to
  * real target paths, where the link paths "appear" to be within the document
  * root. E.g.:
  * <code>
  * array('/home/foo/www/not/real/path' => '/real/target/path') // unix
  * array('C:\\htdocs\\not\\real' => 'D:\\real\\target\\path')  // Windows
  * </code>
  *
  * @return string
  */
 private static function _rewriteRelative($uri, $realCurrentDir, $realDocRoot, $symlinks = array())
 {
     if ('/' === $uri[0]) {
         // root-relative
         return $uri;
     }
     // prepend path with current dir separator (OS-independent)
     $path = strtr($realCurrentDir, '/', DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . strtr($uri, '/', DIRECTORY_SEPARATOR);
     self::$debugText .= "file-relative URI  : {$uri}\n" . "path prepended     : {$path}\n";
     // "unresolve" a symlink back to doc root
     foreach ($symlinks as $link => $target) {
         if (0 === strpos($path, $target)) {
             // replace $target with $link
             $path = $link . substr($path, strlen($target));
             self::$debugText .= "symlink unresolved : {$path}\n";
             break;
         }
     }
     // strip doc root
     $path = substr($path, strlen($realDocRoot));
     self::$debugText .= "docroot stripped   : {$path}\n";
     // fix to root-relative URI
     $uri = strtr($path, '/\\', '//');
     // remove /./ and /../ where possible
     $uri = str_replace('/./', '/', $uri);
     // inspired by patch from Oleg Cherniy
     do {
         $uri = preg_replace('@/[^/]+/\\.\\./@', '/', $uri, 1, $changed);
     } while ($changed);
     self::$debugText .= "traversals removed : {$uri}\n\n";
     $uri = preg_replace('~^' . w3_preg_quote(w3_get_base_path()) . '~', w3_get_site_path(), $uri);
     return $uri;
 }

/**
 * Check if rules exist
 *
 * @param string $rules
 * @param string $start
 * @param string $end
 * @return int
 */
function w3_has_rules($rules, $start, $end)
{
    return preg_match('~' . w3_preg_quote($start) . "\n.*?" . w3_preg_quote($end) . "\n*~s", $rules);
}

/**
 * Translates remote file to local file
 *
 * @param string $file
 * @return string
 */
function w3_translate_file($file)
{
    if (!w3_is_url($file)) {
        $file = '/' . ltrim($file, '/');
        $regexp = '~^' . w3_preg_quote(w3_get_site_path()) . '~';
        $file = preg_replace($regexp, w3_get_base_path(), $file);
        $file = ltrim($file, '/');
    }
    return $file;
}

 /**
  * Returns regexp by mask
  *
  * @param string $mask
  * @return string
  */
 function get_regexp_by_mask($mask)
 {
     $mask = trim($mask);
     $mask = w3_preg_quote($mask);
     $mask = str_replace(array('\\*', '\\?', ';'), array('@ASTERISK@', '@QUESTION@', '|'), $mask);
     $regexp = str_replace(array('@ASTERISK@', '@QUESTION@'), array('[^\\?\\*:\\|"<>]*', '[^\\?\\*:\\|"<>]'), $mask);
     return $regexp;
 }

 /**
  * Cleans scripts
  *
  * @param string $content
  * @return string
  */
 function clean_scripts($content)
 {
     $regexps = array();
     $groups = $this->_config->get_array('minify.js.groups');
     $domain_url_regexp = w3_get_domain_url_regexp();
     foreach ($groups as $group => $locations) {
         foreach ((array) $locations as $location => $config) {
             if (!empty($config['files'])) {
                 foreach ((array) $config['files'] as $file) {
                     if (w3_is_url($file) && !preg_match('~' . $domain_url_regexp . '~i', $file)) {
                         // external JS files
                         $regexps[] = w3_preg_quote($file);
                     } else {
                         // local JS files
                         $file = ltrim(preg_replace('~' . $domain_url_regexp . '~i', '', $file), '/\\');
                         $regexps[] = '(' . $domain_url_regexp . ')?/?' . w3_preg_quote($file);
                     }
                 }
             }
         }
     }
     foreach ($regexps as $regexp) {
         $content = preg_replace('~<script\\s+[^<>]*src=["\']?' . $regexp . '["\']?[^<>]*>\\s*</script>~is', '', $content);
     }
     return $content;
 }

/**
 * Returns domain url regexp
 *
 * @return string
 */
function w3_get_domain_url_regexp()
{
    $domain_url = w3_get_domain_url();
    $domain = preg_replace('~https?://~i', '', $domain_url);
    $regexp = 'https?://' . w3_preg_quote($domain);
    return $regexp;
}

 /**
  * Returns regexp by mask
  *
  * @param string $mask
  * @return string
  */
 function get_regexp_by_mask($mask)
 {
     $regexp = str_replace(array('\\*', '\\?', '\\[', '\\]', ';'), array('[^\\s"\'>]*', '[^\\s"\'>]', '[', ']', '|'), w3_preg_quote($mask));
     return $regexp;
 }

 /**
  * @param $domain_url_regexp
  * @param $baseurl
  * @param $upload_info
  * @param $regexps
  * @return array
  */
 private function make_uploads_regexes($domain_url_regexp, $baseurl, $upload_info, $regexps)
 {
     if (preg_match('~' . $domain_url_regexp . '~i', $baseurl)) {
         $regexps[] = '~(["\'(])\\s*((' . $domain_url_regexp . ')?(' . w3_preg_quote($upload_info['baseurlpath']) . '([^"\')>]+)))~';
     } else {
         $parsed = @parse_url($baseurl);
         $upload_url_domain_regexp = isset($parsed['host']) ? w3_get_url_regexp($parsed['scheme'] . '://' . $parsed['host']) : $domain_url_regexp;
         $baseurlpath = isset($parsed['path']) ? rtrim($parsed['path'], '/') : '';
         if ($baseurlpath) {
             $regexps[] = '~(["\'])\\s*((' . $upload_url_domain_regexp . ')?(' . w3_preg_quote($baseurlpath) . '([^"\'>]+)))~';
         } else {
             $regexps[] = '~(["\'])\\s*((' . $upload_url_domain_regexp . ')(([^"\'>]+)))~';
         }
     }
     return $regexps;
 }