<?php



/**

 * Check if WP permalink directives exists

 *

 * @return boolean

 */

function w3_is_permalink_rules() {

    if ((w3_is_apache() || w3_is_litespeed()) && !w3_is_network()) {

        $path = w3_get_home_root() . '/.htaccess';



        return (($data = @file_get_contents($path)) && strstr($data, W3TC_MARKER_BEGIN_WORDPRESS) !== false);

    }



    return true;

}



/**

 * Returns nginx rules path

 *

 * @return string

 */

function w3_get_nginx_rules_path() {

    $config = & w3_instance('W3_Config');



    $path = $config->get_string('config.path');



    if (!$path) {

        $path = w3_get_document_root() . '/nginx.conf';

    }



    return $path;

}



/**

 * Returns path of pagecache core rules file

 *

 * @return string

 */

function w3_get_pgcache_rules_core_path() {

    switch (true) {

        case w3_is_apache():

        case w3_is_litespeed():

            return w3_get_home_root() . '/.htaccess';



        case w3_is_nginx():

            return w3_get_nginx_rules_path();

    }



    return false;

}



/**

 * Returns path of pgcache cache rules file

 *

 * @return string

 */

function w3_get_pgcache_rules_cache_path() {

    switch (true) {

        case w3_is_apache():

        case w3_is_litespeed():

            return W3TC_CACHE_FILE_PGCACHE_DIR . '/.htaccess';



        case w3_is_nginx():

            return w3_get_nginx_rules_path();

    }



    return false;

}



/**

 * Returns path of browsercache cache rules file

 *

 * @return string

 */

function w3_get_browsercache_rules_cache_path() {

    switch (true) {

        case w3_is_apache():

        case w3_is_litespeed():

            return w3_get_home_root() . '/.htaccess';



        case w3_is_nginx():

            return w3_get_nginx_rules_path();

    }



    return false;

}



/**

 * Returns path of browsercache no404wp rules file

 *

 * @return string

 */

function w3_get_browsercache_rules_no404wp_path() {

    switch (true) {

        case w3_is_apache():

        case w3_is_litespeed():

            return w3_get_home_root() . '/.htaccess';



        case w3_is_nginx():

            return w3_get_nginx_rules_path();

    }



    return false;

}



/**

 * Returns path of minify rules file

 *

 * @return string

 */

function w3_get_minify_rules_core_path() {

    switch (true) {

        case w3_is_apache():

        case w3_is_litespeed():

            return W3TC_CACHE_FILE_MINIFY_DIR . '/.htaccess';



        case w3_is_nginx():

            return w3_get_nginx_rules_path();

    }



    return false;

}



/**

 * Returns path of minify rules file

 *

 * @return string

 */

function w3_get_minify_rules_cache_path() {

    switch (true) {

        case w3_is_apache():

        case w3_is_litespeed():

            return W3TC_CACHE_FILE_MINIFY_DIR . '/.htaccess';



        case w3_is_nginx():

            return w3_get_nginx_rules_path();

    }



    return false;

}



/**

 * Returns path of minify rules file

 *

 * @return string

 */

function w3_get_cdn_rules_path() {

    switch (true) {

        case w3_is_apache():

        case w3_is_litespeed():

            return '.htaccess';



        case w3_is_nginx():

            return 'nginx.conf';

    }



    return false;

}



/**

 * Returns true if we can modify rules

 *

 * @param string $path

 * @return boolean

 */

function w3_can_modify_rules($path) {

    if (w3_is_network()) {

        if (w3_is_apache() || w3_is_litespeed()) {

            switch ($path) {

                case w3_get_pgcache_rules_cache_path():

                case w3_get_minify_rules_core_path():

                case w3_get_minify_rules_cache_path():

                    return true;

            }

        }



        return false;

    }



    return true;

}



/**

 * Trim rules

 *

 * @param string $rules

 * @return string

 */

function w3_trim_rules($rules) {

    $rules = trim($rules);



    if ($rules != '') {

        $rules .= "\n";

    }



    return $rules;

}



/**

 * Cleanup rewrite rules

 *

 * @param string $rules

 * @return string

 */

function w3_clean_rules($rules) {

    $rules = preg_replace('~[\r\n]+~', "\n", $rules);

    $rules = preg_replace('~^\s+~m', '', $rules);

    $rules = w3_trim_rules($rules);



    return $rules;

}



/**

 * Erases text from start to end

 *

 * @param string $rules

 * @param string $start

 * @param string $end

 * @return string

 */

function w3_erase_rules($rules, $start, $end) {

    $rules = preg_replace('~' . w3_preg_quote($start) . "\n.*?" . w3_preg_quote($end) . "\n*~s", '', $rules);

    $rules = w3_trim_rules($rules);



    return $rules;

}



/**

 * 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);

}