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<?php
/**
* Convert RDF from one format to another
*
* The source RDF data can either be fetched from the web
* or typed into the Input box.
*
* The first thing that this script does is make a list the names of the
* supported input and output formats. These options are then
* displayed on the HTML form.
*
* The input data is loaded or parsed into an EasyRdf\Graph.
* That graph is than outputted again in the desired output format.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2020 Nicholas J Humfrey
* @license http://unlicense.org/
*/
require_once realpath(__DIR__.'/..')."/vendor/autoload.php";
require_once __DIR__."/html_tag_helpers.php";
$input_format_options = array('Guess' => 'guess');
$output_format_options = array();
foreach (\EasyRdf\Format::getFormats() as $format) {
if ($format->getSerialiserClass()) {
$output_format_options[$format->getLabel()] = $format->getName();
}
if ($format->getParserClass()) {
$input_format_options[$format->getLabel()] = $format->getName();
}
}
// Stupid PHP :(
if (get_magic_quotes_gpc() and isset($_REQUEST['data'])) {
$_REQUEST['data'] = stripslashes($_REQUEST['data']);
}
// Default to Guess input and Turtle output
if (!isset($_REQUEST['output_format'])) {
$_REQUEST['output_format'] = 'turtle';
}
if (!isset($_REQUEST['input_format'])) {
$_REQUEST['input_format'] = 'guess';
}
// Display the form, if raw option isn't set
if (!isset($_REQUEST['raw'])) {
print "<html>\n";
print "<head><title>EasyRdf Converter</title></head>\n";
print "<body>\n";
print "<h1>EasyRdf Converter</h1>\n";
print "<div style='margin: 10px'>\n";
print form_tag();
print label_tag('data', 'Input Data: ').'<br />'.text_area_tag('data', '', array('cols'=>80, 'rows'=>10)) . "<br />\n";
print label_tag('uri', 'or Uri: ').text_field_tag('uri', 'http://danbri.org/foaf.rdf#danbri', array('size'=>80)) . "<br />\n";
print label_tag('input_format', 'Input Format: ').select_tag('input_format', $input_format_options) . "<br />\n";
print label_tag('output_format', 'Output Format: ').select_tag('output_format', $output_format_options) . "<br />\n";
print label_tag('raw', 'Raw Output: ').check_box_tag('raw') . "<br />\n";
print reset_tag() . submit_tag();
print form_end_tag();
print "</div>\n";
}
if (isset($_REQUEST['uri']) or isset($_REQUEST['data'])) {
// Parse the input
$graph = new \EasyRdf\Graph($_REQUEST['uri']);
if (empty($_REQUEST['data'])) {
$graph->load($_REQUEST['uri'], $_REQUEST['input_format']);
} else {
$graph->parse($_REQUEST['data'], $_REQUEST['input_format'], $_REQUEST['uri']);
}
// Lookup the output format
$format = \EasyRdf\Format::getFormat($_REQUEST['output_format']);
// Serialise to the new output format
$output = $graph->serialise($format);
if (!is_scalar($output)) {
$output = var_export($output, true);
}
// Send the output back to the client
if (isset($_REQUEST['raw'])) {
header('Content-Type: '.$format->getDefaultMimeType());
print $output;
} else {
print '<pre>'.htmlspecialchars($output).'</pre>';
}
}
if (!isset($_REQUEST['raw'])) {
print "</body>\n";
print "</html>\n";
}