Move low-level xml outputting code to a class
Made a class for outputting XML code
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Evan Prodromou
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125f05563b
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2ff7bcfc5d
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<?php
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/**
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* Laconica, the distributed open-source microblogging tool
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*
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* Low-level generator for XML
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Output
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* @package Laconica
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* @author Evan Prodromou <evan@controlyourself.ca>
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* @author Sarven Capadisli <csarven@controlyourself.ca>
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* @copyright 2008 Control Yourself, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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*/
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if (!defined('LACONICA')) {
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exit(1);
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}
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/**
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* Low-level generator for XML
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*
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* This is a thin wrapper around PHP's XMLWriter. The main
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* advantage is the element() method, which simplifies outputting
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* an element.
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*
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* @category Output
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* @package Laconica
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* @author Evan Prodromou <evan@controlyourself.ca>
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* @author Sarven Capadisli <csarven@controlyourself.ca>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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* @see Action
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* @see HTMLOutputter
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*/
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class XMLOutputter
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{
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/**
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* Wrapped XMLWriter object, which does most of the heavy lifting
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* for output.
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*/
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var $xw = null;
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/**
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* Constructor
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*
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* Initializes the wrapped XMLWriter.
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*
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* @param $output URL for outputting, defaults to stdout
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* @param $indent Whether to indent output, default true
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*/
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function __construct($output='php://output', $indent=true)
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{
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$this->xw = new XMLWriter();
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$this->xw->openURI($output);
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$this->xw->setIndent($indent);
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$this->xw->startDocument('1.0', 'UTF-8');
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}
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/**
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* Start a new XML document
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*
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* @param string $doc document element
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* @param string $public public identifier
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* @param string $system system identifier
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*
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* @return void
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*/
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function startXML($doc=null, $public=null, $system=null)
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{
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if ($doc) {
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$this->xw->writeDTD($doc, $public, $system);
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}
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}
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/**
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* finish an XML document
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*
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* It's probably a bad idea to continue to use this object
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* after calling endXML().
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*
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* @return void
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*/
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function endXML()
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{
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$this->xw->endDocument();
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$this->xw->flush();
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}
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/**
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* output an XML element
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*
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* Utility for outputting an XML element. A convenient wrapper
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* for a bunch of longer XMLWriter calls. This is best for
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* when an element doesn't have any sub-elements; if that's the
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* case, use elementStart() and elementEnd() instead.
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*
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* The $content element will be escaped for XML. If you need
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* raw output, use elementStart() and elementEnd() with a call
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* to raw() in the middle.
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*
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* @param string $tag Element type or tagname
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* @param array $attrs Array of element attributes, as
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* key-value pairs
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* @param string $content string content of the element
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*
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* @return void
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*/
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function element($tag, $attrs=null, $content=null)
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{
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$this->elementStart($tag, $attrs);
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if (!is_null($content)) {
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$this->xw->text($content);
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}
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$this->elementEnd($tag);
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}
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/**
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* output a start tag for an element
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*
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* Mostly used for when an element has content that's
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* not a simple string.
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*
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* @param string $tag Element type or tagname
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* @param array $attrs Array of element attributes
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*
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* @return void
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*/
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function elementStart($tag, $attrs=null)
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{
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$this->xw->startElement($tag);
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if (is_array($attrs)) {
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foreach ($attrs as $name => $value) {
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$this->xw->writeAttribute($name, $value);
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}
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} else if (is_string($attrs)) {
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$this->xw->writeAttribute('class', $attrs);
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}
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}
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/**
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* output an end tag for an element
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*
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* Used in conjunction with elementStart(). $tag param
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* should match the elementStart() param.
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*
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* For HTML 4 compatibility, this method will force
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* a full end element (</tag>) even if the element is
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* empty, except for a handful of exception tagnames.
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* This is a hack.
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*
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* @param string $tag Element type or tagname.
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*
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* @return void
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*/
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function elementEnd($tag)
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{
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static $empty_tag = array('base', 'meta', 'link', 'hr',
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'br', 'param', 'img', 'area',
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'input', 'col');
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// XXX: check namespace
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if (in_array($tag, $empty_tag)) {
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$this->xw->endElement();
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} else {
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$this->xw->fullEndElement();
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}
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}
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/**
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* output plain text
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*
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* Text will be escaped. If you need it not to be,
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* use raw() instead.
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*
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* @param string $txt Text to output.
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*
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* @return void
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*/
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function text($txt)
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{
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$this->xw->text($txt);
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}
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/**
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* output raw xml
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*
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* This will spit out its argument verbatim -- no escaping is
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* done.
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*
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* @param string $xml XML to output.
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*
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* @return void
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*/
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function raw($xml)
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{
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$this->xw->writeRaw($xml);
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}
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}
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