495 lines
14 KiB
PHP
495 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) 2002-2015 various MediaWiki contributors
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* GPLv2 license; info in main package.
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*/
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use MediaWiki\Logger\LoggerFactory;
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/**
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* Converts LaTeX to MathML using the mathoid-server
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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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$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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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( '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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if ( $forceReRendering ) {
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$this->setPurge( true );
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}
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if ( $this->renderingRequired() ) {
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return $this->doRender();
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}
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return true;
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}
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/**
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* Helper function to checks if the math tag must be rendered.
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* @return boolean
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*/
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private function renderingRequired() {
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$logger = LoggerFactory::getInstance( 'Math' );
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if ( $this->isPurge() ) {
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$logger->debug( '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( $this->getMathml() ) ) {
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$logger->debug( 'Valid MathML entry found in database.' );
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if ( $this->getSvg( 'cached' ) ) {
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$logger->debug( 'SVG-fallback found in database.' );
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return false;
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} else {
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$logger->debug( 'SVG-fallback missing.' );
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return true;
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}
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} else {
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$logger->debug( 'Malformatted entry found in database' );
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return true;
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}
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} else {
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$logger->debug( '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 $wgMathLaTeXMLTimeout;
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$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 $req Status the request status */
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$status = $req->execute();
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if ( $status->isGood() ) {
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$res = $req->getContent();
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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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LoggerFactory::getInstance( 'Math' )->warning( 'Timeout:' . var_export( array(
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'post' => $post,
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'host' => $host,
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'timeout' => $wgMathLaTeXMLTimeout
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), true ) );
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} else {
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// for any other unkonwn http error
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$errormsg = $status->getHtml();
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$error =
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$this->getError( 'math_invalidresponse', $this->getModeStr(), $host, $errormsg,
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$this->getModeStr( 'mathml' ) );
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LoggerFactory::getInstance( 'Math' )->warning( 'NoResponse:' . var_export( array(
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'post' => $post,
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'host' => $host,
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'errormsg' => $errormsg
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), true ) );
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}
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return false;
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}
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}
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/**
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* Return a MathML daemon host.
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*
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* If more than one demon is available, one is chosen at random.
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*
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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( $this->hosts );
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$this->hosts = $host; // Use the same host for this class instance
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} else {
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$host = $this->hosts;
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}
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LoggerFactory::getInstance( 'Math' )->debug( '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 ( $this->inputType == 'pmml' ||
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$this->getMode() == '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 ( $this->getMathStyle() == 'inlineDisplaystyle' ) {
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// default preserve the (broken) layout as it was
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$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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LoggerFactory::getInstance( 'Math' )->debug( '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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if ( $this->getTex() === '' ) {
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LoggerFactory::getInstance( 'Math' )->debug( 'Rendering was requested, but no TeX string is specified.' );
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$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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$requestResult = $this->makeRequest( $host, $post, $res, $this->lastError );
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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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return $this->processJsonResult( $jsonResult, $host );
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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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LoggerFactory::getInstance( 'Math' )->warning(
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'Mathoid conversion error:' . var_export( array(
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'post' => $post,
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'host' => $host,
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'result' => $res
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), true ) );
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return false;
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}
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} else {
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$this->lastError = $this->getError( 'math_invalidjson', $host );
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LoggerFactory::getInstance( 'Math' )->error(
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'MathML InvalidJSON:' . var_export( array(
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'post' => $post,
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'host' => $host,
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'res' => $res
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), true ) );
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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 ( !$this->XMLValidation ) {
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return true;
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}
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$xmlObject = new XmlTypeCheck( $XML, null, false );
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if ( !$xmlObject->wellFormed ) {
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LoggerFactory::getInstance( 'Math' )->error(
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'XML validation error: ' . var_export( $XML, true ) );
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} else {
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$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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LoggerFactory::getInstance( 'Math' )->error( "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 ( $this->getMathStyle() === 'display' ) {
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// TODO: Improve style cleaning
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$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(\''. $url .
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'\'); background-repeat: no-repeat; background-size: 100% 100%;';
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$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 ( $this->getMathStyle() == 'display' ) {
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$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 ( $this->getMathStyle() == 'display' ) {
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$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 ( $this->getMathStyle() == 'display' ) {
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$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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* @param $jsonResult
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* @param $host
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*
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* @return bool
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*/
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private function processJsonResult( $jsonResult, $host ) {
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if ( $this->getMode() == 'latexml' || $this->inputType == 'pmml' ||
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$this->isValidMathML( $jsonResult->mml )
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) {
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if ( isset( $jsonResult->svg ) ) {
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$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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} else {
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LoggerFactory::getInstance( 'Math' )->error(
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'Missing SVG property in JSON result.' );
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}
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if ( $this->getMode() != 'latexml' && $this->inputType != 'pmml' ) {
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$this->setMathml( $jsonResult->mml );
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}
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Hooks::run( 'MathRenderingResultRetrieved',
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array( &$this,
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&$jsonResult ) ); // Enables debugging of server results
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return true;
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} else {
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$this->lastError = $this->getError( 'math_unknown_error', $host );
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return false;
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}
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}
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}
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