mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Math
synced 2024-11-23 23:25:02 +00:00
1c9383d985
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
695 lines
20 KiB
PHP
695 lines
20 KiB
PHP
<?php
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/**
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* MediaWiki math extension
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*
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* (c) 2002-2012 Tomasz Wegrzanowski, Brion Vibber, Moritz Schubotz, and other MediaWiki contributors
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* GPLv2 license; info in main package.
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*
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* @file
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*/
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/**
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* Abstract base class with static methods for rendering the <math> tags using
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* different technologies. These static methods create a new instance of the
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* extending classes and render the math tags based on the mode setting of the user.
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* Furthermore this class handles the caching of the rendered output and provides
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* debug information, if run in mathdebug mode.
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*
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* @author Tomasz Wegrzanowski
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* @author Brion Vibber
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* @author Moritz Schubotz
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*/
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abstract class MathRenderer {
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// REPRESENTATIONS OF THE MATHEMATICAL CONTENT
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/** @var string tex representation */
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protected $tex = '';
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/** @var string MathML content and presentation */
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protected $mathml = '';
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/** @var string SVG layout only (no semantics) */
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protected $svg = '';
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/** @var string the original user input string (which was used to calculate the inputhash) */
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protected $userInputTex = '';
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// FURTHER PROPERTIES OF THE MATHEMATICAL CONTENT
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/** @var (MW_MATHSTYLE_INLINE_DISPLAYSTYLE|MW_MATHSTYLE_DISPLAY|MW_MATHSTYLE_INLINE) the rendering style */
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protected $mathStyle = MW_MATHSTYLE_INLINE_DISPLAYSTYLE;
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/** @var array with userdefined parameters passed to the extension (not used) */
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protected $params = array();
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/** @var string a userdefined identifier to link to the equation. */
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protected $id = '';
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// DEBUG VARIABLES
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// Available, if Math extension runs in debug mode ($wgMathDebug = true) only.
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/** @var int LaTeXML return code (will be available in future Mathoid versions as well) */
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protected $statusCode = 0;
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/** @var timestamp of the last modification of the database entry */
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protected $timestamp;
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/** @var log messages generated during conversion of mathematical content */
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protected $log = '';
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// STATE OF THE CLASS INSTANCE
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/** @var boolean has variable tex been security-checked */
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protected $texSecure = false;
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/** @var boolean has the mathematical content changed */
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protected $changed = false;
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/** @var boolean is there a database entry for the mathematical content */
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protected $storedInDatabase = null;
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/** @var boolean is there a request to purge the existing mathematical content */
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protected $purge = false;
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/** @var string with last occurred error */
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protected $lastError = '';
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/** @var string md5 value from userInputTex */
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protected $md5 = '';
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/** @var binary packed inputhash */
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protected $inputHash = '';
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/** @var int rendering mode MW_MATH_(PNG|MATHML|SOURCE...) */
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protected $mode = MW_MATH_PNG;
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/**
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* Constructs a base MathRenderer
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*
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* @param string $tex (optional) LaTeX markup
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* @param array $params (optional) HTML attributes
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*/
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public function __construct( $tex = '', $params = array() ) {
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$this->userInputTex = $tex;
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$this->tex = $tex;
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$this->params = $params;
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if ( isset( $params['id'] ) ) {
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$this->id = $params['id'];
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}
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}
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/**
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* Static method for rendering math tag
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*
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* @param string $tex LaTeX markup
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* @param array $params HTML attributes
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* @param int $mode constant indicating rendering mode
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* @return string HTML for math tag
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*/
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public static function renderMath( $tex, $params = array(), $mode = MW_MATH_PNG ) {
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$renderer = self::getRenderer( $tex, $params, $mode );
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if ( $renderer->render() ) {
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return $renderer->getHtmlOutput();
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} else {
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return $renderer->getLastError();
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}
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}
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/**
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*
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* @param string $md5
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* @return MathRenderer the MathRenderer generated from md5
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*/
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public static function newFromMd5( $md5 ) {
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$class = get_called_class();
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/** @var MathRenderer $instance */
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$instance = new $class;
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$instance->setMd5( $md5 );
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$instance->readFromDatabase();
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return $instance;
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}
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/**
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* Static factory method for getting a renderer based on mode
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*
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* @param string $tex LaTeX markup
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* @param array $params HTML attributes
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* @param int $mode constant indicating rendering mode
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* @return MathRenderer appropriate renderer for mode
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*/
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public static function getRenderer( $tex, $params = array(), $mode = MW_MATH_PNG ) {
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global $wgDefaultUserOptions, $wgMathValidModes, $wgMathEnableExperimentalInputFormats;
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$mathStyle = null;
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if ( isset( $params['display'] ) ) {
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$layoutMode = $params['display'];
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if ( $layoutMode == 'block' ) {
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$mathStyle = MW_MATHSTYLE_DISPLAY ;
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// TODO: Implement caching for attributes of the math tag
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// Currently the key for the database entry relating to an equation
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// is md5($tex) the new option to determine if the tex input
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// is rendered in displaystyle or textstyle would require a database
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// layout change to use a composite key e.g. (md5($tex),$mathStyle).
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// As a workaround we use the prefix \displaystyle so that the key becomes
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// md5((\{\\displaystyle|\{\\textstyle)?\s?$tex\}?)
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// The new value of $tex string describes now how the rendering should look like.
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// The variable MathRenderer::mathStyle determines if the rendered equation should
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// be centered in a new line, or just in be displayed in the current line.
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$tex = '{\displaystyle ' . $tex . '}';
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} elseif ( $layoutMode == 'inline' ) {
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$mathStyle = MW_MATHSTYLE_INLINE;
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$tex = '{\textstyle ' . $tex . '}';
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}
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}
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if ( isset( $params['forcemathmode'] ) ) {
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$mode = $params['forcemathmode'];
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}
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if ( !in_array( $mode, $wgMathValidModes ) ) {
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$mode = $wgDefaultUserOptions['math'];
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}
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if ( $wgMathEnableExperimentalInputFormats === true && $mode == MW_MATH_MATHML && isset( $params['type'] ) ) {
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// Support of MathML input (experimental)
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// Currently support for mode MW_MATH_MATHML only
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if( !in_array( $params['type'], array( 'pmml', 'ascii' ) ) ) {
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unset( $params['type'] );
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}
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}
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switch ( $mode ) {
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case MW_MATH_MATHJAX:
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case MW_MATH_SOURCE:
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$renderer = new MathSource( $tex, $params );
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break;
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case MW_MATH_PNG:
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$renderer = new MathTexvc( $tex, $params );
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break;
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case MW_MATH_LATEXML:
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$renderer = new MathLaTeXML( $tex, $params );
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break;
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case MW_MATH_MATHML:
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default:
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$renderer = new MathMathML( $tex, $params );
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}
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wfDebugLog ( "Math", 'start rendering $' . $renderer->tex . '$ in mode ' . $mode );
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$renderer->setMathStyle( $mathStyle );
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return $renderer;
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}
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/**
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* Performs the rendering
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*
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* @return boolean if rendering was successful.
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*/
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abstract public function render();
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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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abstract public function getHtmlOutput();
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/**
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* texvc error messages
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* TODO: update to MathML
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* Returns an internationalized HTML error string
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*
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* @param string $msg message key for specific error
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* @internal param \Varargs $parameters (optional) zero or more message parameters for specific error
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* @return string HTML error string
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*/
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public function getError( $msg /*, ... */ ) {
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$mf = wfMessage( 'math_failure' )->inContentLanguage()->escaped();
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$parameters = func_get_args();
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array_shift( $parameters );
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$errmsg = wfMessage( $msg, $parameters )->inContentLanguage()->escaped();
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$source = htmlspecialchars( str_replace( "\n", ' ', $this->tex ) );
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return "<strong class='error texerror'>$mf ($errmsg): $source</strong>\n";
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}
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/**
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* Return hash of input
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*
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* @return string hash
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*/
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public function getMd5() {
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if ( ! $this->md5 ) {
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$this->md5 = md5( $this->userInputTex );
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}
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return $this->md5;
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}
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/**
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* Set the input hash (if user input tex is not available)
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* @param $md5
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* @return string hash
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*/
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public function setMd5( $md5 ) {
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$this->md5 = $md5;
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}
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/**
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* Return hash of input
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*
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* @return string hash
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*/
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public function getInputHash() {
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// TODO: What happens if $tex is empty?
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if ( !$this->inputHash ) {
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$dbr = wfGetDB( DB_SLAVE );
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return $dbr->encodeBlob( pack( "H32", $this->getMd5() ) ); # Binary packed, not hex
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}
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return $this->inputHash;
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}
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/**
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* Decode binary packed hash from the database to md5 of input_tex
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* @param binary $hash
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* @return string md5
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*/
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private static function dbHash2md5( $hash ) {
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$dbr = wfGetDB( DB_SLAVE );
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$xhash = unpack( 'H32md5', $dbr->decodeBlob( $hash ) . " " );
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return $xhash['md5'];
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}
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/**
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* Reads rendering data from database
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*
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* @return boolean true if read successfully, false otherwise
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*/
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public function readFromDatabase() {
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wfProfileIn( __METHOD__ );
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/** @var DatabaseBase */
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$dbr = wfGetDB( DB_SLAVE );
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/** @var ResultWrapper */
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$rpage = $dbr->selectRow( $this->getMathTableName(),
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$this->dbInArray(),
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array( 'math_inputhash' => $this->getInputHash() ),
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__METHOD__ );
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if ( $rpage !== false ) {
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$this->initializeFromDatabaseRow( $rpage );
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$this->storedInDatabase = true;
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wfProfileOut( __METHOD__ );
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return true;
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} else {
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# Missing from the database and/or the render cache
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$this->storedInDatabase = false;
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wfProfileOut( __METHOD__ );
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return false;
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}
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}
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/**
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* @return array with the database column names
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*/
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protected function dbInArray() {
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$in = array( 'math_inputhash',
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'math_mathml',
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'math_inputtex',
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'math_tex',
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'math_svg'
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);
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return $in;
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}
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/**
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* Reads the values from the database but does not overwrite set values with empty values
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* @param database_row $rpage
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*/
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protected function initializeFromDatabaseRow( $rpage ) {
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$this->inputHash = $rpage->math_inputhash; // MUST NOT BE NULL
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$this->md5 = self::dbHash2md5( $this->inputHash );
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if ( ! empty( $rpage->math_mathml ) ) {
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$this->mathml = utf8_decode( $rpage->math_mathml );
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}
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if ( ! empty( $rpage->math_inputtex ) ) { // in the current database the field is probably not set.
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$this->userInputTex = $rpage->math_inputtex;
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}
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if ( ! empty( $rpage->math_tex ) ) {
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$this->tex = $rpage->math_tex;
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}
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if ( ! empty( $rpage->math_svg ) ) {
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$this->svg = $rpage->math_svg;
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}
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$this->changed = false;
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}
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/**
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* Writes rendering entry to database.
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*
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* WARNING: Use writeCache() instead of this method to be sure that all
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* renderer specific (such as squid caching) are taken into account.
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* This function stores the values that are currently present in the class to the database even if they are empty.
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*
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* This function can be seen as protected function.
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* @param DatabaseBase $dbw
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*/
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public function writeToDatabase( $dbw = null ) {
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global $wgMathDebug;
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# Now save it back to the DB:
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if ( !wfReadOnly() ) {
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$dbw = $dbw ? : wfGetDB( DB_MASTER );
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wfDebugLog( "Math", 'store entry for $' . $this->tex . '$ in database (hash:' . $this->getMd5() . ")\n" );
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$outArray = $this->dbOutArray();
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$method = __METHOD__;
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$mathTableName = $this->getMathTableName();
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if ( $this->isInDatabase() ) {
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$inputHash = $this->getInputHash();
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$dbw->onTransactionIdle(
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function() use( $dbw, $outArray, $wgMathDebug, $inputHash, $method, $mathTableName ) {
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$dbw->update( $mathTableName, $outArray , array( 'math_inputhash' => $inputHash ), $method );
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if ( $wgMathDebug ) wfDebugLog( "Math", 'Row updated after db transaction was idle: ' . var_export( $outArray , true ) . " to database \n" );
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} );
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} else {
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$dbw->onTransactionIdle(
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function() use( $dbw, $outArray, $wgMathDebug, $method, $mathTableName ) {
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$dbw->insert( $mathTableName, $outArray, $method , array ( 'IGNORE' ) );
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if ( $wgMathDebug ) {
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wfDebugLog( "Math", 'Row inserted after db transaction was idle ' . var_export( $outArray , true ) . " to database \n" );
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if ( $dbw->affectedRows() == 0 ) {
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// That's the price for the delayed update.
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wfDebugLog( "Math", 'Entry could not be written. Might be changed in between. ' );
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}
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}
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} );
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}
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}
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}
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/**
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* Gets an array that matches the variables of the class to the database columns
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* @return array
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*/
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protected function dbOutArray() {
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$out = array( 'math_inputhash' => $this->getInputHash(),
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'math_mathml' => utf8_encode( $this->mathml ),
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'math_inputtex' => $this->userInputTex,
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'math_tex' => $this->tex,
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'math_svg' => $this->svg
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);
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return $out;
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}
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/**
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* Returns sanitized attributes
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*
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* @param string $tag element name
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* @param array $defaults default attributes
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* @param array $overrides attributes to override defaults
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* @return array HTML attributes
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*/
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protected function getAttributes( $tag, $defaults = array(), $overrides = array() ) {
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$attribs = Sanitizer::validateTagAttributes( $this->params, $tag );
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$attribs = Sanitizer::mergeAttributes( $defaults, $attribs );
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$attribs = Sanitizer::mergeAttributes( $attribs, $overrides );
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return $attribs;
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}
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/**
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* Writes cache. Writes the database entry if values were changed
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*/
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public function writeCache() {
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global $wgMathDebug;
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if ( $wgMathDebug) wfDebugLog( "Math" , "writing of cache requested." );
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if ( $this->isChanged() ) {
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if ( $wgMathDebug) wfDebugLog( "Math" , "Change detected. Perform writing." );
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$this->writeToDatabase();
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return true;
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} else {
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if ( $wgMathDebug) wfDebugLog( "Math" , "Nothing was changed. Don't write to database." );
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return false;
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}
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}
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/**
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* Gets TeX markup
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*
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* @return string TeX markup
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*/
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public function getTex() {
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return $this->tex;
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}
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/**
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* gets the timestamp, of the last rendering of that equation
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* @return int
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*/
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public function getTimestamp() {
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return $this->timestamp;
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}
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/**
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* gets the rendering mode MW_MATH_*
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*
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* @return int
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*/
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public function getMode() {
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return $this->mode;
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}
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/**
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* Sets the rendering mode
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* @param int $newMode element of the array $wgMathValidModes
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* @return bool
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*/
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public function setMode( $newMode ) {
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global $wgMathValidModes;
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if ( in_array( $newMode, $wgMathValidModes ) ) {
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$this->mode = $newMode;
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return true;
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} else {
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return false;
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}
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}
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/**
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* Sets the TeX code
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*
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* @param string $tex
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*/
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public function setTex( $tex ) {
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if ( $this->tex != $tex ) {
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$this->changed = true;
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$this->tex = $tex;
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}
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}
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/**
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* Gets the MathML XML element
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* @return string in UTF-8 encoding
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*/
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public function getMathml() {
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if ( ! is_callable( 'StringUtils::isUtf8' ) ) {
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$msg = wfMessage( 'math_latexml_xmlversion' )->inContentLanguage()->escaped();
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trigger_error( $msg, E_USER_NOTICE );
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wfDebugLog( 'Math', $msg );
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// If we can not check if mathml output is valid, we skip the test and assume that it is valid.
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} elseif ( ! StringUtils::isUtf8( $this->mathml ) ) {
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$this->setMathml( '' );
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}
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return $this->mathml;
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}
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/**
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* @param string $mathml use UTF-8 encoding
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*/
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public function setMathml( $mathml ) {
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$this->changed = true;
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$this->mathml = $mathml;
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}
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/**
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* Get the attributes of the math tag
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*
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* @return array()
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*/
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public function getParams() {
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return $this->params;
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}
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/**
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* @param array() $params
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*/
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public function setParams( $params ) {
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// $changed is not set to true here, because the attributes do not affect
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// the rendering in the current implementation.
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// If this behavior will change in the future $this->tex is no longer a
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// primary key and the input hash cannot be calculate form $this->tex
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// only. See the discussion 'Tag extensions in Block mode' on wikitech-l.
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$this->params = $params;
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}
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/**
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* Checks if the instance was modified i.e., because math was rendered
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*
|
|
* @return boolean true if something was changed false otherwise
|
|
*/
|
|
public function isChanged() {
|
|
return $this->changed;
|
|
}
|
|
|
|
/**
|
|
* Checks if there is an explicit user request to rerender the math-tag.
|
|
* @return boolean
|
|
*/
|
|
function isPurge( ) {
|
|
if ( $this->purge ) {
|
|
return true;
|
|
}
|
|
$request = RequestContext::getMain()->getRequest();
|
|
// TODO: Figure out if ?action=purge
|
|
// $action = $request->getText('action'); //always returns ''
|
|
// until this issue is resolved we use ?mathpurge=true instead
|
|
$mathpurge = $request->getBool( 'mathpurge', false );
|
|
if ( $mathpurge ) {
|
|
wfDebugLog( 'Math', 'Re-Rendering on user request' );
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets purge. If set to true the render is forced to rerender and must not
|
|
* use a cached version.
|
|
* @param bool $purge
|
|
* @return boolean
|
|
*/
|
|
function setPurge( $purge = true ) {
|
|
$this->changed = true;
|
|
$this->purge = $purge;
|
|
}
|
|
|
|
function getLastError() {
|
|
return $this->lastError;
|
|
}
|
|
|
|
/**
|
|
* @return string
|
|
*/
|
|
public function getLog() {
|
|
return $this->log;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param (MW_MATHSTYLE_INLINE_DISPLAYSTYLE|MW_MATHSTYLE_DISPLAY|MW_MATHSTYLE_INLINE) $mathStyle
|
|
*/
|
|
public function setMathStyle( $displayStyle = MW_MATHSTYLE_DISPLAY ) {
|
|
if ( $this->mathStyle !== $displayStyle ){
|
|
$this->changed = true;
|
|
}
|
|
$this->mathStyle = $displayStyle;
|
|
}
|
|
|
|
/**
|
|
* Returns the value of the DisplayStyle attribute
|
|
* @return (MW_MATHSTYLE_INLINE_DISPLAYSTYLE|MW_MATHSTYLE_DISPLAY|MW_MATHSTYLE_INLINE) the DisplayStyle
|
|
*/
|
|
public function getMathStyle() {
|
|
return $this->mathStyle;
|
|
}
|
|
/**
|
|
* @param string $log
|
|
*/
|
|
public function setLog( $log ) {
|
|
$this->changed = true;
|
|
$this->log = $log;
|
|
}
|
|
|
|
/**
|
|
* @return int
|
|
*/
|
|
public function getStatusCode() {
|
|
return $this->statusCode;
|
|
}
|
|
|
|
/**
|
|
* @param unknown_type $statusCode
|
|
*/
|
|
public function setStatusCode( $statusCode ) {
|
|
$this->changed = true;
|
|
$this->statusCode = $statusCode;
|
|
}
|
|
/**
|
|
* Get if the input tex was marked as secure
|
|
* @return boolean
|
|
*/
|
|
public function isTexSecure() {
|
|
return $this->texSecure;
|
|
}
|
|
|
|
/**
|
|
* @global $wgMathDisableTexFilter
|
|
* @return bool
|
|
*/
|
|
public function checkTex() {
|
|
global $wgMathDisableTexFilter;
|
|
if ( $this->texSecure || (int) $wgMathDisableTexFilter == MW_MATH_CHECK_NEVER ) {
|
|
// equation was already checked or checking is disabled
|
|
return true;
|
|
} else {
|
|
if( (int) $wgMathDisableTexFilter == MW_MATH_CHECK_NEW && $this->mode != MW_MATH_SOURCE ){
|
|
if( $this->readFromDatabase() ){
|
|
return true;
|
|
}
|
|
}
|
|
$checker = new MathInputCheckTexvc( $this->userInputTex );
|
|
if ( $checker->isValid() ) {
|
|
$this->setTex( $checker->getValidTex() );
|
|
$this->texSecure = true;
|
|
return true;
|
|
} else {
|
|
$this->lastError = $checker->getError();
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
public function isInDatabase() {
|
|
if ( $this->storedInDatabase === null ) {
|
|
$this->readFromDatabase();
|
|
}
|
|
return $this->storedInDatabase;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @return string TeX the original tex string specified by the user
|
|
*/
|
|
public function getUserInputTex() {
|
|
return $this->userInputTex;
|
|
}
|
|
|
|
/**
|
|
* @return string Userdefined ID
|
|
*/
|
|
public function getID() {
|
|
return $this->id;
|
|
}
|
|
|
|
/**
|
|
* @param string user defined ID
|
|
*/
|
|
public function setID( $id ) {
|
|
// Changes in the ID affect the container for the math element on the current page
|
|
// only. Therefore an id change does not affect the $this->changed variable, which
|
|
// indicates if database relevant fields have been changed.
|
|
$this->id = $id;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param type $svg
|
|
*/
|
|
public function setSvg( $svg ) {
|
|
$this->changed = true;
|
|
$this->svg = trim( $svg );
|
|
}
|
|
|
|
/**
|
|
* Gets the SVG image
|
|
*
|
|
* @param string $render if set to 'render' (default) and no SVG image exists, the function
|
|
* tries to generate it on the fly.
|
|
* Otherwise, if set to 'cached', and there is no SVG in the database
|
|
* cache, an empty string is returned.
|
|
*
|
|
* @return string XML-Document of the rendered SVG
|
|
*/
|
|
public function getSvg( $render = 'render' ) {
|
|
// Spaces will prevent the image from being displayed correctly in the browser
|
|
return trim( $this->svg );
|
|
}
|
|
|
|
protected abstract function getMathTableName();
|
|
|
|
public function getModeStr() {
|
|
$names = MathHooks::getMathNames();
|
|
return $names[ $this->getMode() ];
|
|
}
|
|
}
|