Technologies Internet et Education, © TECFA
  5. "Stream-parsing"

---

Identification des "Event Handlers" pour les éléments

Définition:

xml_set_element_handler ($parseur, "start_event_handler", "end_event_handler")

Définition formelle du manuel:

bool xml_set_element_handler ( resource parser, callback start_element_handler, callback end_element_handler )

nom_handler_début" et "nom_handler_fin" sont fonctions que vous définissez.

Définition des "Event Handlers

Les fonctions start-event_handler et end_event_handler (vous pouvez choisir d'autres noms) doivent obéir aux définitions suivantes:

start_element_handler ($parser, $nom_element, $attributs)

end_element_handler ($parser, $nom_element)

 

Exemple:

function startElement($parser, $name, $attrs)

{

    print "j'ai trouvé l'éléement: $name <br>";

   }

 

Identification du character data handler

xml_set_character_data_handler($parser, "characterData");

Définition du character data handler

characterData($parser, $data)

Exemple:

function characterData($xml_parser, $data)

{

    print $data;

}

Exemple 5-1: Structure d'un fichier xml en forme d'une liste des éléments

• http://tecfa.unige.ch/guides/php/examples/simple-xml/list-xml-elements.php
• http://tecfa.unige.ch/guides/php/examples/simple-xml/list-xml-elements.phps
• http://tecfa.unige.ch/guides/php/examples/simple-xml/story.xml

<?

$file = "story.xml";

$depth = 0;

# appelé au début d'une balise,l'imprime avec une jolie indentation

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

    global $depth;

    for ($i = 0; $i < $depth; $i++) {

        print "   ";

    }

    print "$name\n<br>";

    $depth[$parser]++;

}

# appelé à la fin d'une balise et imprime

function endElement($parser, $name) {

    global $depth;

    $depth[$parser]--;

    for ($i = 0; $i < $depth; $i++) {

        print "   ";

    }

    print "/$name\n<br>";

}

# créer un "parser"

$xml_parser = xml_parser_create();

# commence à "parser" 

xml_set_element_handler($xml_parser, "startElement", "endElement");

if (!($fp = fopen($file, "r"))) {

    die("could not open XML input");

}

while ($data = fread($fp, 4096)) {

    if (!xml_parse($xml_parser, $data, feof($fp))) {

        die(sprintf("XML error: %s at line %d",

                    xml_error_string(xml_get_error_code($xml_parser)),

                    xml_get_current_line_number($xml_parser)));

    }

}

# libérer le "parser"

xml_parser_free($xml_parser);

?>

Exemple 5-2: Visualisation des données xml en html

• http://tecfa.unige.ch/guides/php/examples/simple-xml/map-x-html2.php
• http://tecfa.unige.ch/guides/php/examples/simple-xml/map-x-html2.phps
• http://tecfa.unige.ch/guides/php/examples/simple-xml/choco-chip.xml

<?

$file = "choco-chip.xml";

// Put the key in upper case !

$begin_array = array(

           "LIST"        => "<H1>RECIPE LIST</H1>",

           "RECIPE"      => "<HR>",

           "RECIPE_NAME" => "<H2>",

           "AUTHOR"      => "Author: <STRONG>",

           "MEAL"        => "<H3>",

           "COURSE"      => "<I>",

           "INGREDIENTS" => "<H3>Ingrediants</H3><OL>",

           "ITEM"        => "<LI>",

           "DIRECTIONS"  => "<H3>Directions</H3><BLOCKQUOTE>"

           );

$end_array = array(

           "LIST"        => "<BR>",

           "RECIPE"      => "<BR>",

           "RECIPE_NAME" => "</H3>",

           "AUTHOR"      => "</STRONG>",

           "MEAL"        => "</H2>",

           "COURSE"      => "</I>",

           "INGREDIENTS" => "</OL>",

           "ITEM"        => "</LI>",

           "DIRECTIONS"  => "</BLOCKQUOTE>"

           );

function startElement($parser, $name, $attrs)

{

    global $begin_array;

    // print "DEBUG: $name <br>";

    if ($htmlexpr = $begin_array[$name]) {

        print "$htmlexpr";

    }

}

function endElement($parser, $name)

{

    global $end_array;

    if ($htmlexpr = $end_array[$name]) {

        print "$htmlexpr";

    }

}

function characterData($parser, $data)

{

    print $data;

}

$xml_parser = xml_parser_create();

// use case-folding so we are sure to find the tag in $begin_array

// does this REALLY work ??? / DKS

xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, true);

xml_set_element_handler($xml_parser, "startElement", "endElement");

xml_set_character_data_handler($xml_parser, "characterData");

if (!($fp = fopen($file, "r"))) {

  die("could not open XML input");

}

while ($data = fread($fp, 4096)) {

  if (!xml_parse($xml_parser, $data, feof($fp))) {

    die(sprintf("XML error: %s at line %d",

        xml_error_string(xml_get_error_code($xml_parser)),

        xml_get_current_line_number($xml_parser)));

  }

}

xml_parser_free($xml_parser);

?>