topical media & game development

topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

alt-bot-lib-simple-spider.php / php


  <?php
  /*

#################################################################

Copyright 2007, Michael Schrenk This software is designed for use with the book, "Webbots, Spiders, and Screen Scarpers", Michael Schrenk, 2007 No Starch Press, San Francisco CA W3C� SOFTWARE NOTICE AND LICENSE This work (and included software, documentation such as READMEs, or other related items) is being provided by the copyright holders under the following license. By obtaining, using and/or copying this work, you (the licensee) agree that you have read, understood, and will comply with the following terms and conditions. Permission to copy, modify, and distribute this software and its documentation, with or without modification, for any purpose and without fee or royalty is hereby granted, provided that you include the following on ALL copies of the software and documentation or portions thereof, including modifications: 1. The full text of this NOTICE in a location viewable to users of the redistributed or derivative work. 2. Any pre-existing intellectual property disclaimers, notices, or terms and conditions. If none exist, the W3C Software Short Notice should be included (hypertext is preferred, text is permitted) within the body of any redistributed or derivative code. 3. Notice of any changes or modifications to the files, including the date changes were made. (We recommend you provide URIs to the location from which the code is derived.) THIS SOFTWARE AND DOCUMENTATION IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF THE SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS. COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF ANY USE OF THE SOFTWARE OR DOCUMENTATION. The name and trademarks of copyright holders may NOT be used in advertising or publicity pertaining to the software without specific, written prior permission. Title to copyright in this software and any associated documentation will at all times remain with copyright holders.
#################################################################

*/

********************************************************************* harvest_links( $url)
-------------------------------------------------------------
DESCRIPTION:
Collects all links from a web page

INPUT:$ url Fully resolved web address of target web page RETURNS: Returns an array of links *********************************************************************


  
  function harvest_links( $url)
      {
      # Initialize
      global$ DELAY;
       $link_array = array();
      
      # Get page base for$ url
       $page_base = get_base_page_address($ url);
      
      # Download webpage
      sleep( $DELAY);$ downloaded_page = http_get( $url, "");$ anchor_tags = parse_array( $downloaded_page['FILE'], "$ <a", "</a>", EXCL);
      # Put http attributes for each tag into an array
      for(xx=0;  $xx$ <count(anchor_tags);  $xx++)
          {$ href = get_attribute( $anchor_tags[$ xx], "href");
           $resolved_addres = resolve_address($ href,  $page_base);$ link_array[] =  $resolved_addres;
          echo "Harvested: ".$ resolved_addres." \n";
          }
      return  $link_array;
      }$

********************************************************************* archive_links(spider_array, $penetration_level,$ temp_link_array) ------------------------------------------------------------- DESCRIPTION: Puts raw links into an archival array INPUT: $spider_array
The name of the archival array$ penetration_level Page depth at which the spidering was conducted $temp_link_array$ temporary array of raw links RETURNS: Returns archival array *********************************************************************


  
  function archive_links( $spider_array,$ penetration_level,  $temp_link_array)
      {
      for($ xx=0;  $xx$ <count(temp_link_array);  $xx++)
          {
          # Don't add exlcuded links to$ spider_array
          if(!excluded_link( $spider_array,$ temp_link_array[ $xx]))
              {$ spider_array[ $penetration_level][] =$ temp_link_array[ $xx];
              }
          }
      return$ spider_array;
      }

********************************************************************* get_domain( $url)
-------------------------------------------------------------
DESCRIPTION:
Gets the domain for a web address
INPUT:$ url The web address RETURNS: Returns the domain for the inputed url *********************************************************************


  
  function get_domain( $url)
      {$ // Remove protocol from url
       $url = str_replace("http://", "",$ url);
       $url = str_replace("https://", "",$ url);
      
      // Remove page and directory references
      if(stristr( $url, "/"))$ url = substr( $url, 0, strpos($ url, "/"));
      
      return  $url;
      }$

********************************************************************* excluded_link(spider_array, $link)
-------------------------------------------------------------
DESCRIPTION:
Tests a link to see if it should be in the archival array
INPUT:$ spider_array The spider's archival array $link
The link under test
RETURNS:
Returns TRUE or FALSE depending on if the link should be
excluded
*********************************************************************$


  
  function excluded_link(spider_array,  $link)
      {
      # Initialization
      global$ SEED_URL,  $exclusion_array,$ ALLOW_OFFISTE;
       $exclude = false;
      
      // Exclude links that are JavaScript commands
      if(stristr($ link, "javascript"))
          {
          echo "Ignored JavaScript fuction:  $link\n";$ exclude=true;
          }
      
      // Exclude redundant links
      for( $xx=0;$ xx<count( $spider_array);$ xx++)
          {
           $saved_link="";
          while(isset($ saved_link))
              {
               $saved_link=array_pop($ spider_array[ $xx]);
              if($ link == array_pop( $spider_array[$ xx]))
                  {
                  echo "Ignored redundant link:  $link\n";$ exclude=true;
                  break;
                  }
              }
          }
      
      // Exclude links found in  $exclusion_array
      for($ xx=0;  $xx$ <count(exclusion_array);  $xx++)
          {
          if(stristr($ link,  $exclusion_array[$ xx]))
              {
              echo "Ignored excluded link:  $link\n";$ exclude=true;
              }
          }
          
      // Exclude offsite links if requested
      if( $ALLOW_OFFISTE==false)
          {
          if(get_domain($ link)!=get_domain( $SEED_URL))
              {
              echo "Ignored offsite link:$ link\n";
               $exclude=true;
              }
          }
  
      return$ exclude;
      }
  ?>

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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