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<?php
/**
* Laconica, the distributed open-source microblogging tool
*
* Low-level generator for XML
*
* PHP version 5
*
* LICENCE: 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/>.
*
* @category Output
* @package Laconica
* @author Evan Prodromou <evan@controlyourself.ca>
* @author Sarven Capadisli <csarven@controlyourself.ca>
* @copyright 2008 Control Yourself, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://laconi.ca/
*/
if (!defined('LACONICA')) {
exit(1);
}
/**
* Low-level generator for XML
*
* This is a thin wrapper around PHP's XMLWriter. The main
* advantage is the element() method, which simplifies outputting
* an element.
*
* @category Output
* @package Laconica
* @author Evan Prodromou <evan@controlyourself.ca>
* @author Sarven Capadisli <csarven@controlyourself.ca>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://laconi.ca/
* @see Action
* @see HTMLOutputter
*/
class XMLOutputter
{
/**
* Wrapped XMLWriter object, which does most of the heavy lifting
* for output.
*/
var $xw = null;
/**
* Constructor
*
* Initializes the wrapped XMLWriter.
*
* @param $output URL for outputting, defaults to stdout
* @param $indent Whether to indent output, default true
*/
function __construct($output='php://output', $indent=true)
{
$this->xw = new XMLWriter();
$this->xw->openURI($output);
$this->xw->setIndent($indent);
$this->xw->startDocument('1.0', 'UTF-8');
}
/**
* Start a new XML document
*
* @param string $doc document element
* @param string $public public identifier
* @param string $system system identifier
*
* @return void
*/
function startXML($doc=null, $public=null, $system=null)
{
if ($doc) {
$this->xw->writeDTD($doc, $public, $system);
}
}
/**
* finish an XML document
*
* It's probably a bad idea to continue to use this object
* after calling endXML().
*
* @return void
*/
function endXML()
{
$this->xw->endDocument();
$this->xw->flush();
}
/**
* output an XML element
*
* Utility for outputting an XML element. A convenient wrapper
* for a bunch of longer XMLWriter calls. This is best for
* when an element doesn't have any sub-elements; if that's the
* case, use elementStart() and elementEnd() instead.
*
* The $content element will be escaped for XML. If you need
* raw output, use elementStart() and elementEnd() with a call
* to raw() in the middle.
*
* @param string $tag Element type or tagname
* @param array $attrs Array of element attributes, as
* key-value pairs
* @param string $content string content of the element
*
* @return void
*/
function element($tag, $attrs=null, $content=null)
{
$this->elementStart($tag, $attrs);
if (!is_null($content)) {
$this->xw->text($content);
}
$this->elementEnd($tag);
}
/**
* output a start tag for an element
*
* Mostly used for when an element has content that's
* not a simple string.
*
* @param string $tag Element type or tagname
* @param array $attrs Array of element attributes
*
* @return void
*/
function elementStart($tag, $attrs=null)
{
$this->xw->startElement($tag);
if (is_array($attrs)) {
foreach ($attrs as $name => $value) {
$this->xw->writeAttribute($name, $value);
}
} else if (is_string($attrs)) {
$this->xw->writeAttribute('class', $attrs);
}
}
/**
* output an end tag for an element
*
* Used in conjunction with elementStart(). $tag param
* should match the elementStart() param.
*
* For HTML 4 compatibility, this method will force
* a full end element (</tag>) even if the element is
* empty, except for a handful of exception tagnames.
* This is a hack.
*
* @param string $tag Element type or tagname.
*
* @return void
*/
function elementEnd($tag)
{
static $empty_tag = array('base', 'meta', 'link', 'hr',
'br', 'param', 'img', 'area',
'input', 'col');
// XXX: check namespace
if (in_array($tag, $empty_tag)) {
$this->xw->endElement();
} else {
$this->xw->fullEndElement();
}
}
/**
* output plain text
*
* Text will be escaped. If you need it not to be,
* use raw() instead.
*
* @param string $txt Text to output.
*
* @return void
*/
function text($txt)
{
$this->xw->text($txt);
}
/**
* output raw xml
*
* This will spit out its argument verbatim -- no escaping is
* done.
*
* @param string $xml XML to output.
*
* @return void
*/
function raw($xml)
{
$this->xw->writeRaw($xml);
}
}
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