279 lines
7.7 KiB
PHP
279 lines
7.7 KiB
PHP
<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social 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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// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Low-level generator for XML
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*
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* @package GNUsocial
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* @category Output
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*
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* @author Evan Prodromou <evan@status.net>
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* @author Sarven Capadisli <csarven@status.net>
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* @copyright 2008-2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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defined('GNUSOCIAL') || die();
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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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* @see Action
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* @see HTMLOutputter
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*
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* @copyright 2008-2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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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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public $xw;
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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 null|string $output URL for outputting, if null it defaults to stdout ('php://output')
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* @param null|bool $indent Whether to indent output, if null it defaults to true
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*
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* @throws ServerException
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*/
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public function __construct($output = null, $indent = null)
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{
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if (is_null($output)) {
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$output = 'php://output';
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}
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$this->xw = new XMLWriter();
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$this->xw->openURI($output);
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if (is_null($indent)) {
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$indent = common_config('site', 'indent');
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}
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$this->xw->setIndent($indent);
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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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public function startXML(?string $doc = null, ?string $public = null, ?string $system = null): void
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{
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$this->xw->startDocument('1.0', 'UTF-8');
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if (!is_null($doc)) {
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$this->xw->writeDTD($doc, $public, $system);
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}
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}
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/**
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* finish an XML document
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*
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* It's probably a bad idea to continue to use this object
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* after calling endXML().
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*
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* @return void
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*/
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public function endXML(): void
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{
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$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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* If $attrs is a string instead of an array, it will be treated
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* as the class attribute of the element.
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*
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* @param string $tag Element type or tagname
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* @param null|array|string $attrs Array of element attributes, as key-value pairs
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* @param null|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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public function element(string $tag, $attrs = null, ?string $content = null): void
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{
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$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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* If $attrs is a string instead of an array, it will be treated
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* as the class attribute of the element.
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*
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* @param string $tag Element type or tagname
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* @param null|array|string $attrs Attributes
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*
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* @return void
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*/
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public function elementStart(string $tag, $attrs = null): void
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{
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$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, $value);
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}
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} elseif (is_string($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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public function elementEnd(string $tag): void
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{
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static $empty_tag = ['base', 'meta', 'link', 'hr',
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'br', 'param', 'img', 'area',
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'input', 'col', 'source', ];
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// XXX: check namespace
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if (in_array($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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* @param array $ns
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* @param string $tag
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* @param null|array|string $attrs
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* @param null|string $content
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*
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* @return void
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*/
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public function elementNS(array $ns, string $tag, $attrs = null, ?string $content = null): void
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{
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$this->elementStartNS($ns, $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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* @param array $ns
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* @param string $tag
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* @param null|array|string $attrs
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*
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* @return void
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*/
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public function elementStartNS(array $ns, string $tag, $attrs = null): void
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{
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reset($ns); // array pointer to 0
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$uri = key($ns);
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$this->xw->startElementNS($ns[$uri], $tag, $uri);
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if (is_array($attrs)) {
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foreach ($attrs as $name => $value) {
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$this->xw->writeAttribute($name, $value);
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}
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} elseif (is_string($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 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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public function text(string $txt): void
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{
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$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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public function raw(string $xml): void
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{
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$this->xw->writeRaw($xml);
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}
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/**
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* output a comment
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*
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* @param string $txt text of the comment
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*
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* @return void
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*/
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public function comment(string $txt): void
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{
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$this->xw->writeComment($txt);
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}
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/**
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* Flush output buffers
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*
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* @return void
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*/
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public function flush(): void
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{
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$this->xw->flush();
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}
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}
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