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SpecialMathShowImage.php
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SpecialMathShowImage.php
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<?php
namespace MediaWiki\Extension\Math;
use InvalidArgumentException;
use MediaWiki\Extension\Math\Render\RendererFactory;
use MediaWiki\MainConfigNames;
use MediaWiki\SpecialPage\SpecialPage;
/**
* Description of SpecialMathShowSVG
*
* @author Moritz Schubotz (Physikerwelt)
*/
class SpecialMathShowImage extends SpecialPage {
/** @var bool */
private $noRender = false;
/** @var MathRenderer|null */
private $renderer = null;
/** @var string */
private $mode = MathConfig::MODE_MATHML;
/** @var MathConfig */
private $mathConfig;
/** @var RendererFactory */
private $rendererFactory;
/**
* @param MathConfig $mathConfig
* @param RendererFactory $rendererFactory
*/
public function __construct(
MathConfig $mathConfig,
RendererFactory $rendererFactory
) {
parent::__construct(
'MathShowImage',
'', // Don't restrict
false // Don't show on Special:SpecialPages - it's not useful interactively
);
$this->mathConfig = $mathConfig;
$this->rendererFactory = $rendererFactory;
}
/**
* Sets headers - this should be called from the execute() method of all derived classes!
* @param bool $success
*/
public function setHeaders( $success = true ) {
$out = $this->getOutput();
$request = $this->getRequest();
$out->setArticleBodyOnly( true );
$out->setArticleRelated( false );
$out->setRobotPolicy( "noindex,nofollow" );
$out->disable();
$request->response()->header( "Content-type: image/svg+xml; charset=utf-8" );
if ( $success && !( $this->noRender ) ) {
$request->response()->header(
'Cache-Control: public, s-maxage=604800, max-age=3600'
); // 1 week (server) 1 hour (client)
$request->response()->header( 'Vary: User-Agent' );
}
}
/** @inheritDoc */
public function execute( $par ) {
$request = $this->getRequest();
$hash = $request->getText( 'hash', '' );
$tex = $request->getText( 'tex', '' );
if ( $this->getConfig()->get( 'MathEnableExperimentalInputFormats' ) ) {
$asciimath = $request->getText( 'asciimath', '' );
} else {
$asciimath = '';
}
$this->mode = MathConfig::normalizeRenderingMode( $request->getText( 'mode' ) );
if ( !$this->mathConfig->isValidRenderingMode( $this->mode ) ) {
// Fallback to the default if an invalid mode was specified
$this->mode = MathConfig::MODE_MATHML;
}
if ( $hash === '' && $tex === '' && $asciimath === '' ) {
$this->setHeaders( false );
echo $this->printSvgError( 'No Inputhash specified' );
return;
}
if ( $tex === '' && $asciimath === '' ) {
try {
$this->renderer = $this->rendererFactory->getFromHash( $hash );
} catch ( InvalidArgumentException $exception ) {
$this->setHeaders( false );
echo $this->printSvgError( $exception->getMessage() );
return;
}
$this->noRender = $request->getBool( 'noRender', false );
$isInDatabase = $this->renderer->readFromCache();
if ( $isInDatabase || $this->noRender ) {
$success = $isInDatabase;
} else {
$success = $this->renderer->render();
}
} elseif ( $asciimath === '' ) {
$this->renderer = $this->rendererFactory->getRenderer( $tex, [], $this->mode );
$success = $this->renderer->render();
} else {
$this->renderer = $this->rendererFactory->getRenderer(
$asciimath, [ 'type' => 'ascii' ], $this->mode
);
$success = $this->renderer->render();
}
if ( $success ) {
$output = $this->renderer->getSvg();
} else {
$output = $this->printSvgError( $this->renderer->getLastError() );
}
if ( $output == "" ) {
$output = $this->printSvgError( 'No Output produced' );
$success = false;
}
$this->setHeaders( $success );
echo $output;
if ( $success ) {
$this->renderer->writeCache();
}
}
/**
* Prints the specified error message as svg.
* @param string $msg error message, HTML escaped
* @return string xml svg image with the error message
*/
private function printSvgError( $msg ) {
$result = <<<SVG
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 4" preserveAspectRatio="xMidYMid meet" >
<text text-anchor="start" fill="red" y="2">
$msg
</text>
</svg>
SVG;
if ( $this->getConfig()->get( MainConfigNames::DebugComments ) ) {
$result .= '<!--' . var_export( $this->renderer, true ) . '-->';
}
return $result;
}
protected function getGroupName(): string {
return 'other';
}
}

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text/x-php
Expires
Sat, Oct 3, 13:38 (1 d, 2 h ago)
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local-disk
Storage Format
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Storage Handle
9b/41/e9bd50f3295c3aae59bfbc6309b0
Default Alt Text
SpecialMathShowImage.php (4 KB)

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