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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);
+ }
+}