public function sel($pattern = '', $idx = NULL, $node = NULL)
{
$strMethodName = 'find';
if (method_exists($this->_dom, $strMethodName)) {
return $this->_dom->find($pattern, $idx);
} else {
Phpfetcher_Log::warning("method {$strMethodName} not exists");
return FALSE;
}
}
/**
* @author xuruiqi
* @param
* array $arrInput : //运行设定
* string 'page_class_name' : //指定要使用的Page类型，必须是
* //Phpfetcher_Page_Abstract的
* //子类
* [array 'page_conf'] : //Page调用setConf时的输入参数，可选
* @return
* obj $this
* @desc
*/
public function &run($arrInput = array())
{
if (empty($this->_arrFetchJobs)) {
Phpfetcher_Log::warning("No fetch jobs.");
return $this;
}
//构建Page对象
$objPage = NULL;
$strPageClassName = self::DEFAULT_PAGE_CLASS;
if (!empty($arrInput['page_class_name'])) {
$strPageClassName = strval($arrInput['page_class_name']);
}
try {
if (!class_exists($strPageClassName, TRUE)) {
throw new Exception("[{$strPageClassName}] class not exists!");
}
$objPage = new $strPageClassName();
if (!$objPage instanceof Phpfetcher_Page_Abstract) {
throw new Exception("[{$strPageClassName}] is not an instance of " . self::ABSTRACT_PAGE_CLASS);
}
} catch (Exception $e) {
Phpfetcher_Log::fatal($e->getMessage());
return $this;
}
//初始化Page对象
$arrPageConf = empty($arrInput['page_conf']) ? array() : $arrInput['page_conf'];
$objPage->init();
if (!empty($arrPageConf)) {
if (isset($arrPageConf['url'])) {
unset($arrPageConf['url']);
}
$objPage->setConf($arrPageConf);
}
//遍历任务队列
foreach ($this->_arrFetchJobs as $job_name => $job_rules) {
if (!$this->_isJobValid($job_rules)) {
Phpfetcher_Log::warning("Job rules invalid [" . serialize($job_rules) . "]");
continue;
}
$intDepth = 0;
$intPageNum = 0;
$arrIndice = array(0, 1);
$arrJobs = array(0 => array($job_rules['start_page']), 1 => array());
//开始爬取
while (!empty($arrJobs[$arrIndice[0]]) && ($job_rules['max_depth'] === -1 || $intDepth < $job_rules['max_depth']) && ($job_rules['max_pages'] === -1 || $intPageNum < $job_rules['max_pages'])) {
$intDepth += 1;
$intPopIndex = $arrIndice[0];
$intPushIndex = $arrIndice[1];
$arrJobs[$intPushIndex] = array();
foreach ($arrJobs[$intPopIndex] as $url) {
if (!($job_rules['max_pages'] === -1 || $intPageNum < $job_rules['max_pages'])) {
break;
}
$objPage->setUrl($url);
$objPage->read();
//获取所有的超链接
$arrLinks = $objPage->getHyperLinks();
//解析当前URL的各个组成部分，以应对超链接中存在站内链接
//的情况，如"/entry"等形式的URL
$strCurUrl = $objPage->getUrl();
$arrUrlComponents = parse_url($strCurUrl);
//匹配超链接
foreach ($job_rules['link_rules'] as $link_rule) {
foreach ($arrLinks as $link) {
//if (preg_match($link_rule, $link) === 1
// && !$this->getHash($link)) {
// $this->setHash($link, true);
// $arrJobs[$intPushIndex][] = $link;
//}
if (preg_match($link_rule, $link) === 1 && !$this->getHash($link)) {
//拼出实际的URL
$real_link = $link;
//不使用strpos，防止扫描整个字符串
//这里只需要扫描前6个字符即可
$colon_pos = false;
for ($i = 0; $i <= 5; ++$i) {
if ($link[$i] == ':') {
$colon_pos = $i;
break;
}
}
if ($colon_pos === false || !$this->_objSchemeTrie->has(substr($link, 0, $colon_pos))) {
//将站内地址转换为完整地址
$real_link = $arrUrlComponents['scheme'] . "://" . $arrUrlComponents['host'] . (isset($arrUrlComponents['port']) && strlen($arrUrlComponents['port']) != 0 ? ":{$arrUrlComponents['port']}" : "") . ($link[0] == '/' ? $link : "/{$link}");
}
$this->setHash($link, true);
$this->setHash($real_link, true);
$arrJobs[$intPushIndex][] = $real_link;
}
}
}
//由用户实现handlePage函数
$objPage->setExtraInfo(array('job_name' => $job_name));
$this->handlePage($objPage);
$intPageNum += 1;
}
if (!empty($this->_arrAdditionalUrls)) {
$arrJobs[$intPushIndex] = array_merge($arrJobs[$intPushIndex], $this->_arrAdditionalUrls);
$this->_arrAdditionalUrls = array();
}
self::_swap($arrIndice[0], $arrIndice[1]);
}
}
return $this;
}
/**
* @author xuruiqi
* @param
* string $strPath : xpath's path
* [DOMNode $contextnode : The optional contextnode can be specified for doing relative XPath queries. By default, the queries are relative to the root element.]
*
* @return
* DOMNodelist : DOMNodelist object
* NULL : if $this->_dom equals NULL
* false : if error occurs
* @desc select corresponding content use xpath
*/
public function sel($strPath, $intIndex = NULL, $contextnode = NULL)
{
if ($this->_dom === NULL) {
Phpfetcher_Log::warning('$this->_dom is NULL!');
return NULL;
}
if ($contextnode !== NULL) {
//$res = $this->_domxpath->query($strPath, $contextnode);
Phpfetcher_Log::warning('param contextnode is no use because of this function\'s inability');
$res = $this->_dom->sel($strPath, $intIndex);
} else {
//$res = $this->_domxpath->query($strPath);
$res = $this->_dom->sel($strPath, $intIndex);
}
return $res;
}
/**
* @author xuruiqi
* @param
* array $arrInput : //运行设定
* string 'page_class_name' : //指定要使用的Page类型，必须是
* //Phpfetcher_Page_Abstract的
* //子类
* [array 'page_conf'] : //Page调用setConf时的输入参数，可选
* @return
* obj $this
* @desc
*/
public function &run($arrInput = array())
{
if (empty($this->_arrFetchJobs)) {
Phpfetcher_Log::warning("No fetch jobs.");
return $this;
}
//构建Page对象
$objPage = NULL;
$strPageClassName = self::DEFAULT_PAGE_CLASS;
if (!empty($arrInput['page_class_name'])) {
$strPageClassName = strval($arrInput['page_class_name']);
}
try {
if (!class_exists($strPageClassName, TRUE)) {
throw new Exception("[{$strPageClassName}] class not exists!");
}
$objPage = new $strPageClassName();
if (!$objPage instanceof Phpfetcher_Page_Abstract) {
throw new Exception("[{$strPageClassName}] is not an instance of " . self::ABSTRACT_PAGE_CLASS);
}
} catch (Exception $e) {
Phpfetcher_Log::fatal($e->getMessage());
return $this;
}
//初始化Page对象
$arrPageConf = empty($arrInput['page_conf']) ? array() : $arrInput['page_conf'];
$objPage->init();
if (!empty($arrPageConf)) {
if (isset($arrPageConf['url'])) {
unset($arrPageConf['url']);
}
$objPage->setConf($arrPageConf);
}
//遍历任务队列
foreach ($this->_arrFetchJobs as $job_name => $job_rules) {
if (!$this->_isJobValid($job_rules)) {
Phpfetcher_Log::warning("Job rules invalid [" . serialize($job_rules) . "]");
continue;
}
$intDepth = 0;
$intPageNum = 0;
$arrIndice = array(0, 1);
$arrJobs = array(0 => array($job_rules['start_page']), 1 => array());
//开始爬取
while (!empty($arrJobs[$arrIndice[0]]) && ($job_rules['max_depth'] === -1 || $intDepth < $job_rules['max_depth']) && ($job_rules['max_pages'] === -1 || $intPageNum < $job_rules['max_pages'])) {
$intDepth += 1;
$intPopIndex = $arrIndice[0];
$intPushIndex = $arrIndice[1];
$arrJobs[$intPushIndex] = array();
foreach ($arrJobs[$intPopIndex] as $url) {
if (!($job_rules['max_pages'] === -1 || $intPageNum < $job_rules['max_pages'])) {
break;
}
$objPage->setUrl($url);
$objPage->read();
//获取所有的超链接
$arrLinks = $objPage->getHyperLinks();
//匹配超链接
foreach ($job_rules['link_rules'] as $link_rule) {
foreach ($arrLinks as $link) {
if (preg_match($link_rule, $link) === 1 && !$this->getHash($link)) {
$this->setHash($link, true);
$arrJobs[$intPushIndex][] = $link;
}
}
}
//由用户实现handlePage函数
$objPage->setExtraInfo(array('job_name' => $job_name));
$this->handlePage($objPage);
$intPageNum += 1;
}
self::_swap($arrIndice[0], $arrIndice[1]);
}
}
return $this;
}