Math/MathMathML.php

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<?php
/**
* MediaWiki math extension
*
* (c)2012 Moritz Schubotz
* GPLv2 license; info in main package.
*
* Contains the driver function for the MathML daemon
* @file
*/
class MathMathML extends MathRenderer {
protected $defaultAllowedRootElements = array( 'math' );
protected $allowedRootElements = '';
protected $hosts;
/** @var boolean if false MathML output is not validated */
private $XMLValidation = true;
/**
* Gets the allowed root elements the rendered math tag might have.
*
* @return array
*/
public function getAllowedRootElements() {
if ( $this->allowedRootElements ) {
return $this->allowedRootElements;
} else {
return $this->defaultAllowedRootElements;
}
}
/**
* Sets the XML validation.
* If set to false the output of MathML is not validated.
* @param boolean $validation
*/
public function setXMLValidation( $validation = true ) {
$this->XMLValidation = $validation;
}
/**
* Sets the allowed root elements the rendered math tag might have.
* An empty value indicates to use the default settings.
* @param array $settings
*/
public function setAllowedRootElments( $settings ) {
$this->allowedRootElements = $settings;
}
/* (non-PHPdoc)
* @see MathRenderer::render()
*/
public function render( $forceReRendering = false ) {
wfProfileIn( __METHOD__ );
if ( $forceReRendering ) {
$this->setPurge( true );
}
if ( $this->renderingRequired() ) {
$res = $this->doRender();
if ( ! $res ) {
wfProfileOut( __METHOD__ );
return $this->getLastError();
}
}
$result = $this->getMathMLTag();
wfProfileOut( __METHOD__ );
return $result;
}
/**
* Helper function to checks if the math tag must be rendered.
* @return boolean
*/
private function renderingRequired() {
if ( $this->isPurge() ) {
wfDebugLog( "Math", "Rerendering was requested." );
return true;
} else {
$dbres = $this->readFromDatabase();
if ( $dbres ) {
if ( $this->isValidMathML( $this->getMathml() ) ) {
wfDebugLog( "Math", "Valid entry found in database." );
return false;
} else {
wfDebugLog( "Math", "Malformatted entry found in database" );
return true;
}
} else {
wfDebugLog( "Math", "No entry found in database." );
return true;
}
}
}
/**
* Performs a HTTP Post request to the given host.
* Uses $wgMathLaTeXMLTimeout as timeout.
* Generates error messages on failure
* @see Http::post()
*
* @global int $wgMathLaTeXMLTimeout
* @param string $host
* @param string $post the encoded post request
* @param mixed $res the result
* @param mixed $error the formatted error message or null
* @param String $httpRequestClass class name of MWHttpRequest (needed for testing only)
* @return boolean success
*/
public function makeRequest( $host, $post, &$res, &$error = '', $httpRequestClass = 'MWHttpRequest' ) {
// TODO: Change the timeout mechanism.
global $wgMathLaTeXMLTimeout;
wfProfileIn( __METHOD__ );
$error = '';
$res = null;
$options = array( 'method' => 'POST', 'postData' => $post, 'timeout' => $wgMathLaTeXMLTimeout );
/** @var $req (CurlHttpRequest|PhpHttpRequest) the request object */
$req = $httpRequestClass::factory( $host, $options );
$status = $req->execute();
if ( $status->isGood() ) {
$res = $req->getContent();
wfProfileOut( __METHOD__ );
return true;
} else {
if ( $status->hasMessage( 'http-timed-out' ) ) {
$error = $this->getError( 'math_timeout', $this->getModeStr(), $host );
$res = false;
wfDebugLog( "Math", "\nTimeout:"
. var_export( array( 'post' => $post, 'host' => $host
, 'timeout' => $wgMathLaTeXMLTimeout ), true ) . "\n\n" );
} else {
// for any other unkonwn http error
$errormsg = $status->getHtml();
$error = $this->getError( 'math_invalidresponse', $this->getModeStr(), $host, $errormsg, $this->getModeStr( MW_MATH_MATHML ) );
wfDebugLog( "Math", "\nNoResponse:"
. var_export( array( 'post' => $post, 'host' => $host
, 'errormsg' => $errormsg ), true ) . "\n\n" );
}
wfProfileOut( __METHOD__ );
return false;
}
}
/**
* Checks if the input is valid MathML,
* and if the root element has the name math
* @param string $XML
* @return boolean
*/
public function isValidMathML( $XML ) {
$out = false;
if ( !$this->XMLValidation ) {
return true;
}
// depends on https://gerrit.wikimedia.org/r/#/c/66365/
if ( !is_callable( 'XmlTypeCheck::newFromString' ) ) {
$msg = wfMessage( 'math_xmlversion' )->inContentLanguage()->escaped();
trigger_error( $msg, E_USER_NOTICE );
wfDebugLog( 'Math', $msg );
return true;
}
$xmlObject = new XmlTypeCheck( $XML, null, false );
if ( !$xmlObject->wellFormed ) {
wfDebugLog( "Math", "XML validation error:\n " . var_export( $XML, true ) . "\n" );
} else {
$name = $xmlObject->getRootElement();
$elementSplit = explode( ':', $name );
if ( is_array($elementSplit) ){
$localName = end( $elementSplit );
} else {
$localName = $name;
}
if ( in_array( $localName , $this->getAllowedRootElements() ) ) {
$out = true;
} else {
wfDebugLog( "Math", "got wrong root element : $name" );
}
}
return $out;
}
/* (non-PHPdoc)
* @see MathRenderer::writeCache()
*/
public function writeCache() {
if ( $this->isChanged() ) {
$this->writeToDatabase();
}
}
/**
* Picks a daemon.
* If more than one demon are available one is chosen from the
* hosts array.
* @return string
*/
protected function pickHost() {
if ( is_array( $this->hosts ) ) {
$host = array_rand( $this->hosts );
} else {
$host = $this->hosts;
}
wfDebugLog( "Math", "picking host " . $host );
return $host;
}
protected function getMathTableName() {
return 'mathoid';
}
/**
* Calculates the default class name for a math element
* @param boolean $fallback
* @param boolean $png
* @return string the class name
*/
protected function getClassName( $fallback = false, $png = false ) {
$class = "mwe-math-";
if ( $fallback ) {
$class .= 'fallback-';
if ( $png ) {
$class .= 'png-';
} else {
$class .= 'svg-';
}
} else {
$class .= 'mathml-';
}
if ( $this->getMathStyle() == MW_MATHSTYLE_DISPLAY ) {
$class .= 'display';
} else {
$class .= 'inline';
}
return $class;
}
/**
* @return string Html output that is embedded in the page
*/
public function getHtmlOutput() {
if ( $this->getMathStyle() == MW_MATHSTYLE_DISPLAY ) {
$element = 'div';
} else {
$element = 'span';
}
$attribs = array();
$output = HTML::openElement( $element, $attribs );
// MathML has to be wrapped into a div or span in order to be able to hide it.
if ( $this->getMathStyle() == MW_MATHSTYLE_DISPLAY ) {
// Remove displayStyle attributes set by the MathML converter
$mml = preg_replace( '/(<math[^>]*)(display|mode)=["\'](inline|block)["\']/', '$1', $this->getMathml() );
// and insert the correct value
$mml = preg_replace( '/<math/', '<math display="block"', $mml );
} else {
$mml = $this->getMathml();
}
$output .= Xml::tags( $element, array( 'class' => $this->getClassName(), 'style' => 'display: none;' ), $mml );
$output .= HTML::closeElement( $element );
return $output;
}
}