topical media & game development
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server-php-xml-class-path-parser-class-path-parser.php / php



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  // Title                     : Class Path_parser
  // Version                   : 1.0
  // Author                    : Luis Argerich (lrargerich@yahoo.com)
  // Last modification date    : 06-24-2002
  // Description               : 
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  // History: 
  // 06-24-2002                : First version of this class.
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  // To-Dos:
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  // How to use it:
  // Read the documentation in path_parser.html
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  if(defined("_class_path_parser_is_included")) {
    // do nothing since the class is already included  
  } else {
    define("_class_path_parser_is_included",1);
  
  // This is a class to parse XML files and call user functions
  // when specific elements (paths) are observed by the parser.
  
  class Path_parser {
    var paths;
    var context=Array();
    var parser;  
    var error;
    var path;
  
      
    function get_error() {
      return this->error; 
    }
        
    function Path_parser() {
      this->init();
    }
    
    function init() {
      this->paths=Array(); 
      this->parser = xml_parser_create_ns("",'^');
      xml_set_object(this->parser,&this);
      xml_parser_set_option(this->parser, XML_OPTION_CASE_FOLDING, false);
      xml_set_element_handler(this->parser, "_startElement", "_endElement");
      xml_set_character_data_handler(this->parser,"_data");
    }
    
    function parse_file(xml) {
      if (!(fp = fopen(xml, "r"))) {
        this->error="Cannot open rddl";
        return false;
      }
      while (data = fread(fp, 4096)) {
        if (!xml_parse(this->parser, data, feof(fp))) {
          this->error="XML error: ".xml_error_string(xml_get_error_code(this->parser))." at line ".xml_get_current_line_number(this->parser);
          return false;                    
        }
      }
      xml_parser_free(this->parser);
      return true;
    }
    
    function parse(data,is_final) {
      ret = xml_parse(this->parser,data,is_final);
      if (is_final) {
        xml_parser_free(this->parser); 
      }
      if(!ret) {
           this->error="XML error: ".xml_error_string(xml_get_error_code(this->parser))." at line ".xml_get_current_line_number(this->parser);
      }
      return ret;
   }
    
    
    
    function set_handler(path,handler_name) {
      this->paths[path]["handler"]=handler_name;
      this->paths[path]["depth"]=-1;
    }
     
    function _startElement(parser,name,attribs) {
      // Add the element to the context
      names=explode('^',name);
      if(count(names)>1) {
        name=names[1];
        name_namespace_uri=names[0]; 
      } else {
        name=names[0]; 
      }
      
      array_push(this->context, name);
      
      path='/'.implode("/",this->context);
      this->path=path;
      //print("Actual path: path <br/>\n");
      // Check all opened paths and update them
      foreach(array_keys(this->paths) as pathk) {
        if(this->paths[pathk]["depth"]>0  ) {
          this->paths[pathk]["depth"]++; 
          this->paths[pathk]["content"].='<'.name;
          foreach(attribs as atk => atv) {
            this->paths[pathk]["content"].=' '.atk.'="'.atv.'"'; 
          }
          this->paths[pathk]["content"].='>';
        }
      }
      
      // If the context path matches some UNMATCHED path then init element data
      if(in_array(path,array_keys(this->paths))) {
         //print("Match!<br/>\n"); 
         if(this->paths[path]["depth"]==-1) {
           this->paths[path]["depth"]=1;
           this->paths[path]["content"]='';
           this->paths[path]["content"]='<'.name;
           this->paths[path]["name"]=name;
           this->paths[path]["attribs"]=attribs;
           foreach(attribs as atk => atv) {
             this->paths[path]["content"].=' '.atk.'="'.atv.'"'; 
           }
           this->paths[path]["content"].='>';
         }
      }  
    }
    
    function _endElement(parser,name) {
      // Decrement element depth
      array_pop(this->context);
      path='/'.implode("/",this->context);
      this->path=path;
      //print("Actual path: path <br/>\n");
      foreach(array_keys(this->paths) as pathk) {
        if(this->paths[pathk]["depth"]>0  ) {
          this->paths[pathk]["depth"]--; 
          this->paths[pathk]["content"].='</'.name.'>';
        }
        if(this->paths[pathk]["depth"]==0) {
          //print("Reportar: pathk <br/>\n"); 
          //print_r(this->paths[pathk]);
          this->paths[pathk]["depth"]=-1;
          this->paths[pathk]["handler"](this->paths[pathk]["name"],this->paths[pathk]["attribs"],this->paths[pathk]["content"]);
        }
      }
      
    }
    
    function _data(parser,data) {
      foreach(array_keys(this->paths) as pathk) {
        if(this->paths[pathk]["depth"]>0  ) {
          this->paths[pathk]["content"].=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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