mediawiki-extensions-Math/MathInputCheckTexvc.php

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<?php
/**
* MediaWiki math extension
*
* (c) 2002-2013 Tomasz Wegrzanowski, Brion Vibber, Moritz Schubotz, and other MediaWiki contributors
* GPLv2 license; info in main package.
*
* @author Moritz Schubotz
*/
class MathInputCheckTexvc extends MathInputCheck {
/**
* Converts an error returned by texvc to a localized exception
*
* @param string $texvcResult error result returned by texvc
* @param bool|MathRenderer $errorRenderer
* @return string
*/
public function convertTexvcError( $texvcResult, $errorRenderer = false ) {
$texvcStatus = substr( $texvcResult, 0, 1 );
$errDetails = htmlspecialchars( substr( $texvcResult, 1 ) );
if ( $errorRenderer === false ) {
$errorRenderer = new MathSource( $this->inputTeX );
}
switch ( $texvcStatus ) {
case 'E':
$errMsg = $errorRenderer->getError( 'math_lexing_error' );
break;
case 'S':
$errMsg = $errorRenderer->getError( 'math_syntax_error' );
break;
case 'F':
$errMsg = $errorRenderer->getError( 'math_unknown_function', $errDetails );
break;
default:
$errMsg = $errorRenderer->getError( 'math_unknown_error' );
}
return $errMsg;
}
/**
* @return boolean
*/
public function isValid() {
$us = $this;
$checkWork = new PoolCounterWorkViaCallback( 'MathTexvc-check', "", array(
'doWork' => function() use ( $us ) {
return $us->doValidCheck();
}
) );
return $checkWork->execute();
}
/**
* @global type $wgTexvc
* @return boolean
*/
public function doValidCheck() {
global $wgMathTexvcCheckExecutable;
if ( !is_executable( $wgMathTexvcCheckExecutable ) ) {
$msg = wfMessage( 'math_notexvccheck' )->inContentLanguage()->escaped();
trigger_error( $msg, E_USER_NOTICE );
wfDebugLog( 'Math', $msg );
return true;
}
$cmd = $wgMathTexvcCheckExecutable . ' ' . wfEscapeShellArg( $this->inputTeX );
if ( wfIsWindows() ) {
# Invoke it within cygwin sh, because texvc expects sh features in its default shell
$cmd = 'sh -c ' . wfEscapeShellArg( $cmd );
}
wfDebugLog( 'Math', "TeX check command: $cmd\n" );
$contents = wfShellExec( $cmd );
wfDebugLog( 'Math', "TeX check result:\n $contents\n---\n" );
if ( strlen( $contents ) === 0 ) {
wfDebugLog( 'Math', "TeX check output was empty. \n" );
$this->lastError = MathRenderer::getError( 'math_unknown_error' );
return false;
}
$retval = substr( $contents, 0, 1 );
if ( $retval !== '+' ) {
$this->lastError = $this->convertTexvcError( $contents );
wfDebugLog( 'Math', 'checkTex failed:' . $this->lastError );
return false;
} else {
$this->validTeX = substr( $contents, 1 );
$this->isSecure = true;
wfDebugLog( 'Math', 'checkTex successful tex is now: ' . $this->validTeX );
return true;
}
}
}