mediawiki-extensions-Math/SpecialMathShowImage.php

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<?php
/**
* Description of SpecialMathShowSVG
*
* @author Moritz Schubotz (Physikerwelt)
*/
class SpecialMathShowImage extends SpecialPage {
private $noRender = false;
private $renderer = null;
private $mode = MW_MATH_MATHML;
function __construct() {
parent::__construct(
'MathShowImage',
'', // Don't restrict
false // Don't show on Special:SpecialPages - it's not useful interactively
);
}
/**
* Sets headers - this should be called from the execute() method of all derived classes!
*/
function setHeaders( $success = true ) {
$out = $this->getOutput();
$request = $this->getRequest();
$out->setArticleBodyOnly( true );
$out->setArticleRelated( false );
$out->setRobotPolicy( "noindex,nofollow" );
$out->disable();
if ( $success && $this->mode == MW_MATH_PNG ) {
$request->response()->header( "Content-type: image/png;" );
} else {
$request->response()->header( "Content-type: image/svg+xml; charset=utf-8" );
}
if ( $success && !( $this->noRender ) ) {
$request->response()->header( 'Cache-Control: public max-age=2419200' ); // 4 weeks
$request->response()->header( 'Vary: User-Agent' );
}
}
function execute( $par ) {
global $wgMathValidModes, $wgMathEnableExperimentalInputFormats;
$request = $this->getRequest();
$hash = $request->getText( 'hash', '' );
$tex = $request->getText( 'tex', '' );
if ( $wgMathEnableExperimentalInputFormats ) {
$asciimath = $request->getText( 'asciimath', '' );
} else {
$asciimath = '';
}
$this->mode = $request->getInt( 'mode', MW_MATH_MATHML );
if ( !in_array( $this->mode, $wgMathValidModes ) ) {
// Fallback to the default if an invalid mode was specified
$this->mode = MW_MATH_MATHML;
}
if ( $hash === '' && $tex === '' && $asciimath === '' ) {
$this->setHeaders( false );
echo $this->printSvgError( 'No Inputhash specified' );
} else {
if ( $tex === '' && $asciimath === ''){
switch ( $this->mode ) {
case MW_MATH_PNG:
$this->renderer = MathTexvc::newFromMd5( $hash );
break;
case MW_MATH_LATEXML:
$this->renderer = MathLaTeXML::newFromMd5( $hash );
break;
default:
$this->renderer = MathMathML::newFromMd5( $hash );
}
$this->noRender = $request->getBool( 'noRender', false );
$isInDatabase = $this->renderer->readFromDatabase();
if ( $isInDatabase || $this->noRender ) {
$success = $isInDatabase;
} else {
if ( $this->mode == MW_MATH_PNG ) {
// get the texvc input from the mathoid database table
// and render the conventional way
$mmlRenderer = MathMathML::newFromMd5( $hash );
$mmlRenderer->readFromDatabase();
$this->renderer = MathRenderer::getRenderer( $mmlRenderer->getUserInputTex(), array(), MW_MATH_PNG );
$this->renderer->setMathStyle( $mmlRenderer->getMathStyle() );
}
$success = $this->renderer->render();
}
} elseif ( $asciimath === '' ) {
$this->renderer = MathRenderer::getRenderer( $tex , array(), $this->mode );
$success = $this->renderer->render();
} else {
$this->renderer = MathRenderer::getRenderer( $asciimath , array( 'type' => 'ascii' ), $this->mode );
$success = $this->renderer->render();
}
if ( $success ) {
if ( $this->mode == MW_MATH_PNG ) {
// Workaround for bugfix for Bug 56769
if ( !isset( $wgHooks['ParserAfterParse']['FlushMathBackend'] ) ) {
// saves the PNG-file
wfRunHooks('ParserAfterParse');
}
$output = $this->renderer->getPng();
} else {
$output = $this->renderer->getSvg();
}
} else {
// Error message in PNG not supported
$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
* @return xml svg image with the error message
*/
private function printSvgError( $msg ) {
global $wgMathDebug;
$result = '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 100 4"
preserveAspectRatio="xMidYMid meet" >' .
'<text text-anchor="start" fill="red" y="2">' . htmlspecialchars( $msg ) . '</text></svg>';
if ( $wgMathDebug ) {
$result .= '<!--'. var_export($this->renderer, true) .'-->';
}
return $result;
}
}