/**
* Sets the URL of the first page the crawler should crawl (root-page).
*
* The given url may contain the protocol (http://www.foo.com or https://www.foo.com), the port (http://www.foo.com:4500/index.php)
* and/or basic-authentication-data (http://loginname:passwd@www.foo.com)
*
* This url has to be set before calling the {@link go()}-method (of course)!
* If this root-page doesn't contain any further links, the crawling-process will stop immediately.
*
* @param string $url The URL
* @return bool
*
* @section 1 Basic settings
*/
public function setURL($url)
{
$url = trim($url);
if ($url != "" && is_string($url)) {
$this->starting_url = PHPCrawlerUtils::normalizeURL($url);
return true;
} else {
return false;
}
}
/**
* Returns an array containig regular-expressions corresponding
* to the given robots.txt-style "Disallow"-lines
*
* @param array &$applying_lines Numeric array containing "disallow"-lines.
* @param string $base_url Base-URL the robots.txt-file was found in.
*
* @return array Numeric array containing regular-expresseions created for each "disallow"-line.
*/
protected function buildRegExpressions($applying_lines, $base_url)
{
// First, get all "Disallow:"-pathes
$disallow_pathes = array();
$cnt = count($applying_lines);
for ($x = 0; $x < $cnt; $x++) {
preg_match("#^Disallow:\\s*(.*)# i", $applying_lines[$x], $match);
if (!empty($match[1])) {
$path = trim($match[1]);
// Add leading slash
if (substr($path, 0, 1) != "/") {
$path = "/" . $path;
}
$disallow_pathes[] = $path;
}
}
// Works like this:
// The base-url is http://www.foo.com.
// The driective says: "Disallow: /bla/"
// This means: The nonFollowMatch is "#^http://www\.foo\.com/bla/#"
$normalized_base_url = PHPCrawlerUtils::normalizeURL($base_url);
$non_follow_expressions = array();
$cnt = count($disallow_pathes);
for ($x = 0; $x < $cnt; $x++) {
$non_follow_path_complpete = $normalized_base_url . $disallow_pathes[$x];
// "http://www.foo.com/bla/"
$non_follow_exp = preg_quote($non_follow_path_complpete, "#");
// "http://www\.foo\.com/bla/"
$non_follow_exp = "#^" . $non_follow_exp . "#";
// "#^http://www\.foo\.com/bla/#"
$non_follow_expressions[] = $non_follow_exp;
}
return $non_follow_expressions;
}
