126 lines
4.3 KiB
PHP
126 lines
4.3 KiB
PHP
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<?php
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/**
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* iNewS Project
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*
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* LICENSE
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*
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* http://www.inews.com.cn/license/inews
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*
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* @category iNewS
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* @package ChangeMe
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* @subpackage ChangeMe
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* @copyright Copyright (c) 2008 Zeed Technologies PRC Inc. (http://www.inews.com.cn)
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* @author xSharp ( GTalk: xSharp@gmail.com )
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* @since May 7, 2010
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* @version SVN: $Id$
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*/
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class Zeed_Text_Snatch
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{
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/**
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* 分析HTML中的链接信息:
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* href|src|url|location|codebase|background|data|profile|action|open
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*
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* @param String $source
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* @param Array $tags_to_extract
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* @param Boolean $aggressive_mode
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* @return Array
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*/
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public static function findLinks($source, $tags_to_extract = array('src'), $aggressive_mode = false)
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{
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$match_part = "";
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$all_links = array(); // will get filled with the found links
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$target_array = array();
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if (! is_array($tags_to_extract)) {
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$tags_to_extract = array(
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(string) $tags_to_extract);
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}
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// Now check if user added linktags to extract and if so, use them
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// (build expression-part like "href|src|location ...")
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@reset($tags_to_extract);
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if (count($tags_to_extract) > 0) {
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while (list($key) = @each($tags_to_extract)) {
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$match_part .= "|" . $tags_to_extract[$key];
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}
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$match_part = substr($match_part, 1);
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} else {
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// else we use the default extraction
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$match_part = "href|src|url|location|codebase|background|data|profile|action|open";
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}
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// 1. <a href="...">LINKTEXT</a> (well formed with </a> at the end)
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// Get the link AND the linktext from these tags
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// This has to be done FIRST !!
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preg_match_all("/<[ ]{0,}a[ \n\r][^<>]{0,}(?<= |\n|\r)(?:" . $match_part . ")[ \n\r]{0,}=[ \n\r]{0,}[\"|']{0,1}([^\"'>< ]{0,})[^<>]{0,}>((?:(?!<[ \n\r]*\/a[ \n\r]*>).)*)<[ \n\r]*\/a[ \n\r]*>/ is", $source, $regs);
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// regs[0] -> complete <a href> tags
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// regs[1] -> the links (raw)
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// regs[2] -> linktext
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for ($x = 0; $x < count($regs[1]); $x ++) {
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$tmp_array["link_raw"] = trim($regs[1][$x]);
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$tmp_array["linktext"] = $regs[2][$x];
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$tmp_array["linkcode"] = trim($regs[0][$x]);
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$map_key = $tmp_array["link_raw"];
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if (! isset($map_array[$map_key])) {
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$target_array[] = $tmp_array;
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$map_array[$map_key] = true;
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}
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}
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// Now we "preg" all other matches
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// 2. all like <..href="..."> <..src=".."> and so on
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$pregs[] = "/<[^<>]{0,}[ \n\r](?:" . $match_part . ")[ \n\r]{0,}=[ \n\r]{0,}[\"|']{0,1}([^\"'>< ]{0,})[^<>]{0,}>/ is";
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// Now, if agressive_mode is set to true, we look for some
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// other things
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if ($aggressive_mode == true) {
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// Everyhtnig inside OR outside a tag
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// "=" or "(" after tag
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$pregs[] = "/[ \.:;](?:" . $match_part . ")[ \n\r]{0,}[=|\(][ \n\r]{0,}[\"|']{0,1}([^\"'>< ;]{0,})['\"<> ;]/ is";
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// Stuff like ..open="("...")
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// currently in the expression above
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// slowed down the whole thing..but returned better "linkcode"
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// $pregs[]="/(?:".$match_part.")[ \n\r]{0,}\([ \n\r]{0,}(?:\"|'){1}([^\"'><\n ]{0,})(\"|')[^)]*\)/ is";
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}
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// Now execute the pregs
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for ($x = 0; $x < count($pregs); $x ++) {
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unset($regs);
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preg_match_all($pregs[$x], $source, $regs);
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for ($y = 0; $y < count($regs[1]); $y ++) {
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unset($tmp_array);
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$tmp_array["link_raw"] = trim($regs[1][$y]);
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$tmp_array["linkcode"] = trim($regs[0][$y]);
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$tmp_array["linktext"] = "";
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$map_key = $tmp_array["link_raw"];
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if (! isset($map_array[$map_key])) {
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$target_array[] = $tmp_array;
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$map_array[$map_key] = true;
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}
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}
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}
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return $target_array;
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}
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}
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// End ^ LF ^ encoding
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