mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Math
synced 2024-11-27 17:01:07 +00:00
3ffa1dbc11
MathMathML::renderingRequired called the getSvg function in MathLaTeXML that caused an automatic rerendering of the SVG image if it was not cached. That this rendering is triggered from the function renderingRequired is contra intutive and should be avoided. Change-Id: Ifa14f50193a05b3058624a18974c56897fcec09e
478 lines
14 KiB
PHP
478 lines
14 KiB
PHP
<?php
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/**
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* MediaWiki math extension
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*
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* (c)2012 Moritz Schubotz
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* GPLv2 license; info in main package.
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*
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* Contains the driver function for the MathML daemon
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* @file
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*/
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class MathMathML extends MathRenderer {
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protected $defaultAllowedRootElements = array( 'math' );
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protected $allowedRootElements = '';
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protected $hosts;
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/** @var boolean if false MathML output is not validated */
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private $XMLValidation = true;
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protected $inputType = 'tex';
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/**
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* @param string $inputType
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*/
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public function setInputType($inputType)
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{
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$this->inputType = $inputType;
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}
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/**
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* @return string
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*/
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public function getInputType()
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{
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return $this->inputType;
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}
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public function __construct( $tex = '', $params = array() ) {
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global $wgMathMathMLUrl;
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parent::__construct( $tex, $params );
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$this->setMode( MW_MATH_MATHML );
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$this->hosts = $wgMathMathMLUrl;
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if ( isset( $params['type'] ) ) {
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if ( $params['type'] == 'pmml' ) {
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$this->inputType = 'pmml';
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$this->setMathml( '<math>' . $tex . '</math>' );
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} elseif ( $params['type'] == 'ascii' ) {
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$this->inputType = 'ascii';
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}
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}
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}
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/**
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* Gets the allowed root elements the rendered math tag might have.
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*
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* @return array
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*/
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public function getAllowedRootElements() {
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if ( $this->allowedRootElements ) {
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return $this->allowedRootElements;
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} else {
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return $this->defaultAllowedRootElements;
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}
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}
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/**
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* Sets the XML validation.
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* If set to false the output of MathML is not validated.
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* @param boolean $validation
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*/
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public function setXMLValidation( $validation = true ) {
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$this->XMLValidation = $validation;
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}
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/**
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* Sets the allowed root elements the rendered math tag might have.
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* An empty value indicates to use the default settings.
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* @param array $settings
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*/
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public function setAllowedRootElements( $settings ) {
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$this->allowedRootElements = $settings;
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}
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/* (non-PHPdoc)
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* @see MathRenderer::render()
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*/
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public function render( $forceReRendering = false ) {
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wfProfileIn( __METHOD__ );
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if ( $forceReRendering ) {
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$this->setPurge( true );
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}
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if ( $this->renderingRequired() ) {
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wfProfileOut( __METHOD__ );
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return $this->doRender( );
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}
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wfProfileOut( __METHOD__ );
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return true;
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}
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/**
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* Helper function to checks if the math tag must be rendered.
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* @return boolean
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*/
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private function renderingRequired() {
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if ( $this->isPurge() ) {
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wfDebugLog( "Math", "Rerendering was requested." );
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return true;
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} else {
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$dbres = $this->isInDatabase();
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if ( $dbres ) {
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if ( $this->isValidMathML( $this->getMathml() ) ) {
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wfDebugLog( "Math", "Valid MathML entry found in database." );
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if ( $this->getSvg( false ) ) {
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wfDebugLog( "Math", "SVG-fallback found in database." );
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return false;
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} else {
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wfDebugLog( "Math", "SVG-fallback missing." );
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return true;
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}
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} else {
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wfDebugLog( "Math", "Malformatted entry found in database" );
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return true;
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}
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} else {
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wfDebugLog( "Math", "No entry found in database." );
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return true;
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}
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}
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}
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/**
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* Performs a HTTP Post request to the given host.
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* Uses $wgMathLaTeXMLTimeout as timeout.
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* Generates error messages on failure
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* @see Http::post()
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*
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* @global int $wgMathLaTeXMLTimeout
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* @param string $host
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* @param string $post the encoded post request
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* @param mixed $res the result
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* @param mixed $error the formatted error message or null
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* @param String $httpRequestClass class name of MWHttpRequest (needed for testing only)
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* @return boolean success
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*/
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public function makeRequest( $host, $post, &$res, &$error = '', $httpRequestClass = 'MWHttpRequest' ) {
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// TODO: Change the timeout mechanism.
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global $wgMathLaTeXMLTimeout;
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wfProfileIn( __METHOD__ );
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$error = '';
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$res = null;
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if ( !$host ) {
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$host = self::pickHost();
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}
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if ( !$post ) {
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$this->getPostData();
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}
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$options = array( 'method' => 'POST', 'postData' => $post, 'timeout' => $wgMathLaTeXMLTimeout );
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/** @var $req (CurlHttpRequest|PhpHttpRequest) the request object */
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$req = $httpRequestClass::factory( $host, $options );
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/** @var Status the request status */
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$status = $req->execute();
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if ( $status->isGood() ) {
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$res = $req->getContent();
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wfProfileOut( __METHOD__ );
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return true;
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} else {
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if ( $status->hasMessage( 'http-timed-out' ) ) {
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$error = $this->getError( 'math_timeout', $this->getModeStr(), $host );
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$res = false;
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wfDebugLog( "Math", "\nTimeout:"
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. var_export( array( 'post' => $post, 'host' => $host
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, 'timeout' => $wgMathLaTeXMLTimeout ), true ) . "\n\n" );
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} else {
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// for any other unkonwn http error
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$errormsg = $status->getHtml();
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$error = $this->getError( 'math_invalidresponse', $this->getModeStr(), $host, $errormsg, $this->getModeStr( MW_MATH_MATHML ) );
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wfDebugLog( "Math", "\nNoResponse:"
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. var_export( array( 'post' => $post, 'host' => $host
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, 'errormsg' => $errormsg ), true ) . "\n\n" );
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}
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wfProfileOut( __METHOD__ );
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return false;
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}
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}
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/**
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* Picks a MathML daemon.
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* If more than one demon are available one is chosen from the
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* $wgMathMathMLUrl array.
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* @return string
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*/
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protected function pickHost() {
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if ( is_array( $this->hosts ) ) {
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$host = array_rand( $this->hosts );
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} else {
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$host = $this->hosts;
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}
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wfDebugLog( "Math", "picking host " . $host );
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return $host;
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}
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/**
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* Calculates the HTTP POST Data for the request. Depends on the settings
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* and the input string only.
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* @return string HTTP POST data
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*/
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public function getPostData() {
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$input = $this->getTex();
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if ( $this->inputType == 'pmml' || $this->getMode() == MW_MATH_LATEXML && $this->getMathml() ) {
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$out = 'type=mml&q=' . rawurlencode( $this->getMathml() );
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} elseif ( $this->inputType == 'ascii' ) {
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$out = 'type=asciimath&q=' . rawurlencode( $input );
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} else {
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if ( $this->getMathStyle() == MW_MATHSTYLE_INLINE_DISPLAYSTYLE ) {
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// default preserve the (broken) layout as it was
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$out = 'type=inline-TeX&q=' .rawurlencode( '{\\displaystyle ' . $input . '}' );
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} else {
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$out = 'type=tex&q=' . rawurlencode( $input );
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}
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}
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wfDebugLog( "Math", 'Get post data: ' . $out );
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return $out;
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}
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/**
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* Does the actual web request to convert TeX to MathML.
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* @return boolean
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*/
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protected function doRender() {
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global $wgMathDebug;
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if ( $this->getTex() === '' ) {
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wfDebugLog( 'Math', 'Rendering was requested, but no TeX string is specified.' );
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$this->lastError = $this->getError( 'math_empty_tex' );
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return false;
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}
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$res = '';
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$host = self::pickHost();
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$post = $this->getPostData();
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$this->lastError = '';
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if( $wgMathDebug ) { $renderingStart = microtime( true ); }
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$requestResult = $this->makeRequest( $host, $post, $res, $this->lastError );
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if( $wgMathDebug ) { $this->setRenderingTime( microtime( true ) - $renderingStart ); }
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if ( $requestResult ) {
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$jsonResult = json_decode( $res );
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if ( $jsonResult && json_last_error() === JSON_ERROR_NONE ) {
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if ( $jsonResult->success ) {
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if ( $this->getMode() == MW_MATH_LATEXML ||
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$this->inputType == 'pmml' ||
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$this->isValidMathML( $jsonResult->mml ) ) {
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$xmlObject = new XmlTypeCheck( $jsonResult->svg, null, false );
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if ( ! $xmlObject->wellFormed ) {
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$this->lastError = $this->getError( 'math_invalidxml', $host );
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return false;
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} else {
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$this->setSvg( $jsonResult->svg );
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}
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if ( $wgMathDebug ) {
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$this->setLog( $jsonResult->log );
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$this->setPostData( $post );
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$this->writeDebugLog();
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}
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if ( $this->getMode() != MW_MATH_LATEXML && $this->inputType != 'pmml') {
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$this->setMathml( $jsonResult->mml );
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}
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return true;
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} else {
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$this->lastError = $this->getError( 'math_unknown_error', $host );
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return false;
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}
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} else {
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if ( property_exists( $jsonResult, 'log' ) ) {
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$log = $jsonResult->log;
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} else {
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$log = wfMessage( 'math_unknown_error' )->inContentLanguage()->escaped();
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}
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$this->lastError = $this->getError( 'math_mathoid_error', $host, $log );
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wfDebugLog( 'Math', "Mathoid conversion error:"
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. var_export( array( 'post' => $post, 'host' => $host
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, 'result' => $res ), true ) . "\n\n" );
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return false;
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}
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} else {
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$this->lastError = $this->getError( 'math_invalidjson', $host );
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wfDebugLog( 'Math', "\nMathML InvalidJSON:"
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. var_export( array( 'post' => $post, 'host' => $host
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, 'res' => $res ), true ) . "\n\n" );
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return false;
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}
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} else {
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// Error message has already been set.
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return false;
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}
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}
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/**
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* Checks if the input is valid MathML,
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* and if the root element has the name math
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* @param string $XML
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* @return boolean
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*/
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public function isValidMathML( $XML ) {
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$out = false;
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if ( !$this->XMLValidation ) {
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return true;
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}
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// depends on https://gerrit.wikimedia.org/r/#/c/66365/
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if ( !is_callable( 'XmlTypeCheck::newFromString' ) ) {
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$msg = wfMessage( 'math_xmlversion' )->inContentLanguage()->escaped();
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trigger_error( $msg, E_USER_NOTICE );
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wfDebugLog( 'Math', $msg );
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return true;
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}
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$xmlObject = new XmlTypeCheck( $XML, null, false );
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if ( !$xmlObject->wellFormed ) {
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wfDebugLog( "Math", "XML validation error:\n " . var_export( $XML, true ) . "\n" );
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} else {
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$name = $xmlObject->getRootElement();
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$elementSplit = explode( ':', $name );
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if ( is_array($elementSplit) ) {
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$localName = end( $elementSplit );
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} else {
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$localName = $name;
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}
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if ( in_array( $localName , $this->getAllowedRootElements() ) ) {
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$out = true;
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} else {
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wfDebugLog( "Math", "got wrong root element : $name" );
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}
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}
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return $out;
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}
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/**
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* @param boolean $noRender
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* @return type
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*/
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private function getFallbackImageUrl( $noRender = false ) {
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return SpecialPage::getTitleFor( 'MathShowImage' )->getLocalURL( array(
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'hash' => $this->getMd5(),
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'mode' => $this->getMode(),
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'noRender' => $noRender )
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);
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}
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/**
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* Helper function to correct the style information for a
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* linked SVG image.
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* @param string $svg SVG-image data
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* @param string $style current style information to be updated
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*/
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public function correctSvgStyle( $svg, &$style ) {
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if ( preg_match( '/style="([^"]*)"/', $svg, $styles ) ) {
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$style .= " ".$styles[1]; // merge styles
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if ( $this->getMathStyle() === MW_MATHSTYLE_DISPLAY ) {
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// TODO: Improve style cleaning
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$style = preg_replace( '/margin\-(left|right)\:\s*\d+(\%|in|cm|mm|em|ex|pt|pc|px)\;/', '', $style );
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}
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$style = preg_replace( '/position:\s*absolute;\s*left:\s*0px;/', '', $style );
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}
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// TODO: Figure out if there is a way to construct
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// a SVGReader from a string that represents the SVG
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// content
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if ( preg_match( "/height=\"(.*?)\"/" , $this->getSvg(), $matches ) ) {
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$style .= "height: " . $matches[1] . "; ";
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}
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if ( preg_match( "/width=\"(.*?)\"/", $this->getSvg(), $matches ) ) {
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$style .= "width: " . $matches[1] . ";";
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}
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}
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/**
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* Gets img tag for math image
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* @param boolean $noRender if true no rendering will be performed if the image is not stored in the database
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* @param boolean|string $classOverride if classOverride is false the class name will be calculated by getClassName
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* @return string XML the image html tag
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*/
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private function getFallbackImage( $noRender = false, $classOverride = false ) {
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$url = $this->getFallbackImageUrl( $noRender );
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$attribs = array();
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if ( $classOverride === false ) { // $class = '' suppresses class attribute
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$class = $this->getClassName( true );
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} else {
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$class = $classOverride;
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}
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// TODO: move the common styles to the global stylesheet!
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$style = 'background-image: url(\''. $url. '\'); background-repeat: no-repeat; background-size: 100% 100%;';
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$this->correctSvgStyle( $this->getSvg(), $style );
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if ( $class ) { $attribs['class'] = $class; }
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if ( $style ) { $attribs['style'] = $style; }
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// Don't use an empty span, as that is going to be stripped by HTML tidy
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// when enabled (which is true in production).
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return Xml::element( 'meta', $this->getAttributes( 'span', $attribs , array( 'aria-hidden' => 'true' ) ) );
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}
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protected function getMathTableName() {
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return 'mathoid';
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}
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/**
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* Calculates the default class name for a math element
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* @param boolean $fallback
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* @return string the class name
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*/
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private function getClassName( $fallback = false ) {
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$class = "mwe-math-";
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if ( $fallback ) {
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$class .= 'fallback-image-';
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} else {
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$class .= 'mathml-';
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}
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if ( $this->getMathStyle() == MW_MATHSTYLE_DISPLAY ) {
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$class .= 'display';
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} else {
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$class .= 'inline';
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}
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if ( !$fallback) {
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$class .= ' mwe-math-mathml-a11y';
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}
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return $class;
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}
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/**
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* @return string Html output that is embedded in the page
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*/
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public function getHtmlOutput() {
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if ( $this->getMathStyle() == MW_MATHSTYLE_DISPLAY ) {
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$element = 'div';
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} else {
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$element = 'span';
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}
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$attribs = array();
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if ( $this->getID() !== '' ) {
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$attribs['id'] = $this->getID();
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}
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$output = HTML::openElement( $element, $attribs );
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// MathML has to be wrapped into a div or span in order to be able to hide it.
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// Remove displayStyle attributes set by the MathML converter
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// (Beginning from Mathoid 0.2.5 block is the default layout.)
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$mml = preg_replace( '/(<math[^>]*)(display|mode)=["\'](inline|block)["\']/', '$1', $this->getMathml() );
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if ( $this->getMathStyle() == MW_MATHSTYLE_DISPLAY ) {
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$mml = preg_replace( '/<math/', '<math display="block"', $mml );
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}
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$output .= Xml::tags( $element, array( 'class' => $this->getClassName(), 'style' => 'display: none;' ), $mml );
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$output .= $this->getFallbackImage( );
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$output .= HTML::closeElement( $element );
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return $output;
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}
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protected function dbOutArray() {
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$out = parent::dbOutArray();
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if ($this->getMathTableName() == 'mathoid' ) {
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$out['math_input'] = $out['math_inputtex'];
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unset($out['math_inputtex']);
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}
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return $out;
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}
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protected function dbInArray() {
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$out = parent::dbInArray();
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if ($this->getMathTableName() == 'mathoid' ) {
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$out = array_diff( $out, array( 'math_inputtex' ) );
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$out[] = 'math_input';
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}
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return $out;
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}
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protected function initializeFromDatabaseRow( $rpage ) {
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// mathoid allows different input formats
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// therefore the column name math_inputtex was changed to math_input
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if ( $this->getMathTableName() == 'mathoid' && ! empty( $rpage->math_input ) ) {
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$this->userInputTex = $rpage->math_input;
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}
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parent::initializeFromDatabaseRow( $rpage );
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}
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}
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