topical media & game development
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server-php-xml-class-sax-filters-class-sax-filters.php / php



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  // Title                     : Sax Filters
  // Version                   : 1.0
  // Author                    : Luis Argerich (lrargerich@yahoo.com)
  // Last modification date    : 05-20-2002
  // Description               : A set of classes defining interfaces for generic SAX
  //                             parsers as well as SAX filters.
  //   
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  // History: 
  // 05-15-2002                : First version of this class.
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  // To-Dos:
  // Improve the Expat SAX parser class to process PI's and other not-so-common
  // XML nodes.
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  // How to use it:
  // Read the documentation in sax_filters.html
  //   
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  // CHECK FOR DOUBLE DEFINITION HERE
  if(defined("_class_sax_filters_is_included")) {
    // do nothing since the class is already included  
  } else {
    define("_class_sax_filters_is_included",1); 
  
  class AbstractStreamer {
    function stream(data) {}
  }
  
  class SimpleStreamer extends AbstractStreamer {
    function stream(data) {
        print(data);
    }
  }
  
  class AbstractSAXParser {
    var listener;
    function AbstractSAXParser() {}
    function parserSetoption(opt,val) {}
    function setListener(obj) {
      this->listener=obj;
    }
    function startElementHandler(parser,name,attribs) {
      this->listener->startElementHandler(name,attribs);
    }
    function endElementHandler(parser,name) {
      this->listener->endElementHandler(name);
    }
    function characterDataHandler(parser,data) {
      this->listener->characterDataHandler(data);
    }
    function parse() {}
  }
  
  class AbstractFilter {
    var listener;
  
    function  setListener(obj) {
      this->listener=obj;
    }
    function startElementHandler(name,attribs) {}
    function endElementHandler(name) {}
    function characterDataHandler(data) {}
  
  }
  
  class ExpatParser extends AbstractSAXParser {
    var parser;
    var filename;
    var buffer;
    var error_string;
    var line;
  
    function ExpatParser(xmlfile) {
      this->filename=xmlfile;
      this->parser=xml_parser_create();
      this->buffer=4096;
      xml_set_object(this->parser,&this);
      xml_set_element_handler(this->parser,"startElementHandler","endElementHandler");
      xml_set_character_data_handler(this->parser,"characterDataHandler");
    }
  
    function parserSetOption(opt,val) {
      return xml_parser_set_option ( this->parser, opt, val);
    }
  
    function parse() {
      if (!(fp = fopen(this->filename, "r"))) {
         return 0;
      }
  
      while (data = fread(fp, this->buffer)) {
        if (!xml_parse(this->parser, data, feof(fp))) {
                      this->error_string=xml_error_string(xml_get_error_code(xml_parser));
                      this->line=xml_get_current_line_number(xml_parser);
                      die("Error: ".this->error_string." on ".this->line);
        }
      }
      xml_parser_free(this->parser);
      return 1;
    }
  }
  
  class FilterName extends AbstractFilter {
    var flag=0;
  
    function startElementHandler(name,attribs) {
      if(strtolower(name)=="name") {
        this->flag=1;
      } else {
        this->flag=0;
      }
      this->listener->startElementHandler(name,attribs);
    }
  
    function endElementHandler(name) {
      if(strtolower(name)=="name") {
        this->flag=0;
      }
      this->listener->endElementHandler(name);
    }
  
     function characterDataHandler(data) {
       if(this->flag) {
         data=strtoupper(data);
       }
       this->listener->characterDataHandler(data);
     }
  
  }
  
  class FilterNameBold extends AbstractFilter {
    var flag=0;
  
    function startElementHandler(name,attribs) {
      if(strtolower(name)=="name") {
        this->flag=1;
      } else {
        this->flag=0;
      }
      this->listener->startElementHandler(name,attribs);
      if(this->flag) {this->listener->startElementHandler("b",array());}
    }
  
    function endElementHandler(name) {
      if(strtolower(name)=="name") {
        this->flag=0;
        this->listener->endElementHandler("b");
      }
      this->listener->endElementHandler(name);
  
    }
  
     function characterDataHandler(data) {
       if(this->flag) {
         data=strtoupper(data);
       }
       this->listener->characterDataHandler(data);
     }
  
  }
  
  class FilterStreamer extends AbstractFilter {
     var stream;
  
     function FilterStreamer(obj) {
       this->stream=obj;
     }
  
     function startElementHandler(name,attribs) {
        this->stream->stream("<name");
        foreach(attribs as key => val) {
          this->stream->stream(" key='val'");
        }
        this->stream->stream(">");
     }
  
     function endElementHandler(name) {
        this->stream->stream("</name>");
     }
  
     function characterDataHandler(data) {
        this->stream->stream("data");
     }
  }
  
  class FilterOutput extends AbstractFilter {
  
     function startElementHandler(name,attribs) {
       print("&lt;name");
       foreach(attribs as key => val) {
         print(" key='val'");
       }
       print("&gt;<br />");
     }
  
     function endElementHandler(name) {
       print("&lt;/name&gt;<br />");
     }
  
     function characterDataHandler(data) {
       print("data");
     }
  
  }
  
  ?>
  
  <?
  }
  ?>
[] 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) _

(C) Æliens 20/2/2008

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