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| -rw-r--r-- | lib/xmloutputter.php | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/lib/xmloutputter.php b/lib/xmloutputter.php new file mode 100644 index 000000000..9a7d12e4c --- /dev/null +++ b/lib/xmloutputter.php @@ -0,0 +1,223 @@ +<?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); + } +} |