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<?php
/* GNU FM -- a free network service for sharing your music listening habits
Copyright (C) 2009 Free Software Foundation, Inc
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
class JSONEncoder {
/**
* Encode a SimpleXML object in JSON format matching Last.fm's output
*
* @param $xml - A SimpleXMLElement
* @return A JSON formatted string
*/
public static function encodeXML($xml) {
if ($xml->getName() == 'lfm' && count($xml->children())) {
$xml = $xml->children();
}
$json_data[$xml->getName()] = JSONEncoder::recursivelyEncodeXML($xml);
return json_encode($json_data);
}
public static function recursivelyEncodeXML($xml) {
$json_data = array();
if (count($xml->children())) {
foreach ($xml->children() as $child) {
if (array_key_exists($child->getName(), $json_data)) {
if (!array_key_exists(0, $json_data[$child->getName()])) {
$a = array();
$a[] = $json_data[$child->getName()];
$json_data[$child->getName()] = $a;
}
$json_data[$child->getName()][] = JSONEncoder::recursivelyEncodeXML($child);
} else {
$json_data[$child->getName()] = JSONEncoder::recursivelyEncodeXML($child);
}
}
if (count($xml->attributes())) {
$json_data['@attr'] = array();
foreach ($xml->attributes() as $k => $v) {
$json_data['@attr'][$k] = (string) $v;
}
}
} else {
// Leaf node
if (count($xml->attributes())) {
$json_data['#text'] = (string) $xml;
foreach ($xml->attributes() as $k => $v) {
$json_data[$k] = (string) $v;
}
} else {
$json_data = (string) $xml;
}
}
return $json_data;
}
}
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