XML Parser

[gamehack]

Hello all,

I was designing my simple parser class but it doesn't work although I've been coding it very carefully. If someone could help, I will be very thankful. The first snipper of code is the index.php and the second one is travel.xml. The last one is the error message.

<?php

class xmlparser {
        var $currentTag; // keeping track of which tag is the parser currently parsing
        var $currentAttribs; // keeping track of the attributes the parser is currently parsing
        var $file; // the target file
        var $debug; // Set to 1 to turn on debugging or 0 to turn off debugging.
        var $xmlParser;
        var $caseFold;
        var $targetEncoding;
        var $fp;
        var $data;


    function startElement($parser, $name, $attribs)
    {

        $this->currentTag = $name;

        $this->currentAttribs = $attribs;
        # define the HTML to use for the start tag.
        switch ($name) {
        case "Recordset":
            break;

        case "Travelpackage":
            while (list ($key, $value) = each ($attribs)) {
                echo("<tr><td>$key: $value</td></tr>\n");
            }
            break;

        case "package":
            break;

        default:
            echo("<tr><td>$name</td><td>\n");
            break;
        }
    }

    function endElement($parser, $name)
    {
        # output closing HTML tags
        switch ($name) {

        case "Travelpackage":
            echo("<tr><td colspan=\"2\"><hr></td></tr>\n");
            break;

        default:
            echo("</td></tr>\n");
            break;
        }
        # clear current tag variable
        $this->currentTag = "";
        $this->currentAttribs = "";
    }

   function characterData($parser, $data)
    {
        # add HTML tags to the values
        switch ($this->currentTag) {
        case "Country_name":
            echo("<a href=\"#\">$data</a>\n");
            break;
        default:
            echo($data);
            break;
        }
    }

   function init()
   {
    $this->xmlParser = xml_parser_create();

     $this->caseFold = xml_parser_get_option($this->xmlParser,
                                       XML_OPTION_CASE_FOLDING);
     $this->targetEncoding = xml_parser_get_option($this->xmlParser,
                                             XML_OPTION_TARGET_ENCODING);
     if ($this->debug > 0) {
         echo("Debug is set to: $this->debug<br>\n");
         echo("Case folding is set to: $this->caseFold<br>\n");
         echo("Target Encoding is set to: $this->targetEncoding<br>\n");
     }
     # disable case folding
     if ($this->caseFold == 1) {
         xml_parser_set_option($this->xmlParser, XML_OPTION_CASE_FOLDING, false);
     }
     # set callback functions
    xml_set_element_handler($this->xmlParser, "startElement", "endElement");
    xml_set_character_data_handler($this->xmlParser, "characterData");
   }

  function doapycss($file, $debug)
  {
   $this->debug = $debug;
   $this->file = $file;
   if (!($this->fp = fopen($this->file, "r"))) {
        die("Cannot open XML data file: $this->file");
    }

    # read and parse data
    while ($this->data = fread($this->fp, 4096)) {
     # error handling
          if (!xml_parse($this->xmlParser, $this->data, feof($this->fp))) {
              die(sprintf("XML error: %s at line %d",
                          xml_error_string(xml_get_error_code($this->xmlParser)),
                          xml_get_current_line_number($this->xmlParser)));
              xml_parser_free($this->xmlParser);
          }
      }

  }

  function free()
  {
   # free up the parser
   xml_parser_free($this->xmlParser);
  }
 }

 $doapy = new xmlparser("travel.xml", 0);
 $doapy->init();


?>

<Recordset>
      <Travelpackage name="a">
        <Country_name>Cuba</Country_name>
        <City>Cayo Coco</City>
        <Resort>Club Tryp Cayo Coco</Resort>
        <Resort_rating>4</Resort_rating>
        <Resort_typeofholiday>beach</Resort_typeofholiday>
        <Resort_watersports>true</Resort_watersports>
        <Resort_meals>true</Resort_meals>
        <Resort_drinks>true</Resort_drinks>
        <Package>
          <Package_dateofdep>5/8/98</Package_dateofdep>
          <Package_price>879</Package_price>
        </Package>
      </Travelpackage>
      <Travelpackage name="b">
        <Country_name>Cuba</Country_name>
        <City>Varadero </City>
        <Resort>Sol Club Paleras</Resort>
        <Resort_rating>3</Resort_rating>
        <Resort_typeofholiday>beach</Resort_typeofholiday>
        <Resort_watersports>false</Resort_watersports>
        <Resort_meals>true</Resort_meals>
        <Resort_drinks>false</Resort_drinks>
        <Package>
          <Package_dateofdep>5/1/98</Package_dateofdep>
          <Package_price>779</Package_price>
        </Package>
      </Travelpackage>
    </Recordset>

Warning: xml_parse(): supplied argument is not a valid XML Parser resource in htdocs/doapycss/class.php on line 105

Warning: xml_get_error_code(): supplied argument is not a valid XML Parser resource in htdocs/doapycss/class.php on line 107

Warning: xml_get_current_line_number(): supplied argument is not a valid XML Parser resource in htdocs/doapycss/class.php on line 108
XML error: at line 0

Thanks very much

[ahundiak]

Your submitted code does not show the doappycss method being called. The warnings seem to indicate that this method is somehow getting called before the init method.

You might also take a look at:
http://www.php.net/manual/en/function.xml-set-object.php
There is a very clear example of creating an xml parser class.

[gamehack]

Thanks very much 🙂

I fixed the code. Here's the proper one:

<?php

class xmlparser {
        var $currentTag; // keeping track of which tag is the parser currently parsing
        var $currentAttribs; // keeping track of the attributes the parser is currently parsing
        var $file; // the target file
        var $debug; // Set to 1 to turn on debugging or 0 to turn off debugging.
        var $xmlParser;
        var $caseFold;
        var $targetEncoding;
        var $fp;
        var $data;


    function startElement($parser, $name, $attribs)
    {

        $this->currentTag = $name;

        $this->currentAttribs = $attribs;
        # define the HTML to use for the start tag.
        switch ($name) {
        case "Recordset":
            break;

        case "Travelpackage":
            while (list ($key, $value) = each ($attribs)) {
                echo("<tr><td>$key: $value</td></tr>\n");
            }
            break;

        case "package":
            break;

        default:
            echo("<tr><td>$name</td><td>\n");
            break;
        }
    }

    function endElement($parser, $name)
    {
        # output closing HTML tags
        switch ($name) {

        case "Travelpackage":
            echo("<tr><td colspan=\"2\"><hr></td></tr>\n");
            break;

        default:
            echo("</td></tr>\n");
            break;
        }
        # clear current tag variable
        $this->currentTag = "";
        $this->currentAttribs = "";
    }

   function characterData($parser, $data)
    {
        # add HTML tags to the values
        switch ($this->currentTag) {
        case "Country_name":
            echo("<a href=\"#\">$data</a>\n");
            break;
        default:
            echo($data);
            break;
        }
    }

   function init()
   {
    $this->xmlParser = xml_parser_create();
    xml_set_object($this->xmlParser, &$this);

     $this->caseFold = xml_parser_get_option($this->xmlParser,
                                       XML_OPTION_CASE_FOLDING);
     $this->targetEncoding = xml_parser_get_option($this->xmlParser,
                                             XML_OPTION_TARGET_ENCODING);
     if ($this->debug > 0) {
         echo("Debug is set to: $this->debug<br>\n");
         echo("Case folding is set to: $this->caseFold<br>\n");
         echo("Target Encoding is set to: $this->targetEncoding<br>\n");
     }
     # disable case folding
     if ($this->caseFold == 1) {
         xml_parser_set_option($this->xmlParser, XML_OPTION_CASE_FOLDING, false);
     }
     # set callback functions
    xml_set_element_handler($this->xmlParser, "startElement", "endElement");
    xml_set_character_data_handler($this->xmlParser, "characterData");
   }

  function parse($file, $debug)
  {
   $this->debug = $debug;
   $this->file = $file;
   if (!($this->fp = fopen($this->file, "r"))) {
        die("Cannot open XML data file: $this->file");
    }

    # read and parse data
    while ($this->data = fread($this->fp, 4096)) {
     # error handling
          if (!xml_parse($this->xmlParser, $this->data, feof($this->fp))) {
              die(sprintf("XML error: %s at line %d",
                          xml_error_string(xml_get_error_code($this->xmlParser)),
                          xml_get_current_line_number($this->xmlParser)));
              xml_parser_free($this->xmlParser);
          }
      }

  }

  function free()
  {
   # free up the parser
   xml_parser_free($this->xmlParser);
  }
 }

 $doapy = new xmlparser();
 $doapy->init();
 $doapy->parse("travel.xml", 0);
 $doapy->free();


?>