MediaWiki 1.7.1 wiederhergestellt

1 files changed, 269 insertions, 0 deletions

diff --git a/includes/Math.php b/includes/Math.php
new file mode 100644
index 00000000..f9d6a605
--- /dev/null
+++ b/includes/Math.php
@@ -0,0 +1,269 @@
+<?php
+/**
+ * Contain everything related to <math> </math> parsing
+ * @package MediaWiki
+ */
+
+/**
+ * Takes LaTeX fragments, sends them to a helper program (texvc) for rendering
+ * to rasterized PNG and HTML and MathML approximations. An appropriate
+ * rendering form is picked and returned.
+ *
+ * by Tomasz Wegrzanowski, with additions by Brion Vibber (2003, 2004)
+ *
+ * @package MediaWiki
+ */
+class MathRenderer {
+	var $mode = MW_MATH_MODERN;
+	var $tex = '';
+	var $inputhash = '';
+	var $hash = '';
+	var $html = '';
+	var $mathml = '';
+	var $conservativeness = 0;
+
+	function MathRenderer( $tex ) {
+		$this->tex = $tex;
+ 	}
+
+	function setOutputMode( $mode ) {
+		$this->mode = $mode;
+	}
+
+	function render() {
+		global $wgTmpDirectory, $wgInputEncoding;
+		global $wgTexvc;
+		$fname = 'MathRenderer::render';
+
+		if( $this->mode == MW_MATH_SOURCE ) {
+			# No need to render or parse anything more!
+			return ('$ '.htmlspecialchars( $this->tex ).' $');
+		}
+
+		if( !$this->_recall() ) {
+			# Ensure that the temp and output directories are available before continuing...
+			if( !file_exists( $wgTmpDirectory ) ) {
+				if( !@mkdir( $wgTmpDirectory ) ) {
+					return $this->_error( 'math_bad_tmpdir' );
+				}
+			} elseif( !is_dir( $wgTmpDirectory ) || !is_writable( $wgTmpDirectory ) ) {
+				return $this->_error( 'math_bad_tmpdir' );
+			}
+
+			if( function_exists( 'is_executable' ) && !is_executable( $wgTexvc ) ) {
+				return $this->_error( 'math_notexvc' );
+			}
+			$cmd = $wgTexvc . ' ' .
+					escapeshellarg( $wgTmpDirectory ).' '.
+					escapeshellarg( $wgTmpDirectory ).' '.
+					escapeshellarg( $this->tex ).' '.
+					escapeshellarg( $wgInputEncoding );
+
+			if ( wfIsWindows() ) {
+				# Invoke it within cygwin sh, because texvc expects sh features in its default shell
+				$cmd = 'sh -c ' . wfEscapeShellArg( $cmd );
+			}
+
+			wfDebug( "TeX: $cmd\n" );
+			$contents = `$cmd`;
+			wfDebug( "TeX output:\n $contents\n---\n" );
+
+			if (strlen($contents) == 0) {
+				return $this->_error( 'math_unknown_error' );
+			}
+
+			$retval = substr ($contents, 0, 1);
+			$errmsg = '';
+			if (($retval == 'C') || ($retval == 'M') || ($retval == 'L')) {
+				if ($retval == 'C')
+					$this->conservativeness = 2;
+				else if ($retval == 'M')
+					$this->conservativeness = 1;
+				else
+					$this->conservativeness = 0;
+				$outdata = substr ($contents, 33);
+
+				$i = strpos($outdata, "\000");
+
+				$this->html = substr($outdata, 0, $i);
+				$this->mathml = substr($outdata, $i+1);
+			} else if (($retval == 'c') || ($retval == 'm') || ($retval == 'l'))  {
+				$this->html = substr ($contents, 33);
+				if ($retval == 'c')
+					$this->conservativeness = 2;
+				else if ($retval == 'm')
+					$this->conservativeness = 1;
+				else
+					$this->conservativeness = 0;
+				$this->mathml = NULL;
+			} else if ($retval == 'X') {
+				$this->html = NULL;
+				$this->mathml = substr ($contents, 33);
+				$this->conservativeness = 0;
+			} else if ($retval == '+') {
+				$this->html = NULL;
+				$this->mathml = NULL;
+				$this->conservativeness = 0;
+			} else {
+				$errbit = htmlspecialchars( substr($contents, 1) );
+				switch( $retval ) {
+					case 'E': $errmsg = $this->_error( 'math_lexing_error', $errbit );
+					case 'S': $errmsg = $this->_error( 'math_syntax_error', $errbit );
+					case 'F': $errmsg = $this->_error( 'math_unknown_function', $errbit );
+					default:  $errmsg = $this->_error( 'math_unknown_error', $errbit );
+				}
+			}
+
+			if ( !$errmsg ) {
+				 $this->hash = substr ($contents, 1, 32);
+			}
+
+			$res = wfRunHooks( 'MathAfterTexvc', array( &$this, &$errmsg ) );
+
+			if ( $errmsg ) {
+				 return $errmsg;
+			}
+
+			if (!preg_match("/^[a-f0-9]{32}$/", $this->hash)) {
+				return $this->_error( 'math_unknown_error' );
+			}
+
+			if( !file_exists( "$wgTmpDirectory/{$this->hash}.png" ) ) {
+				return $this->_error( 'math_image_error' );
+			}
+
+			$hashpath = $this->_getHashPath();
+			if( !file_exists( $hashpath ) ) {
+				if( !@wfMkdirParents( $hashpath, 0755 ) ) {
+					return $this->_error( 'math_bad_output' );
+				}
+			} elseif( !is_dir( $hashpath ) || !is_writable( $hashpath ) ) {
+				return $this->_error( 'math_bad_output' );
+			}
+
+			if( !rename( "$wgTmpDirectory/{$this->hash}.png", "$hashpath/{$this->hash}.png" ) ) {
+				return $this->_error( 'math_output_error' );
+			}
+
+			# Now save it back to the DB:
+			if ( !wfReadOnly() ) {
+				$outmd5_sql = pack('H32', $this->hash);
+
+				$md5_sql = pack('H32', $this->md5); # Binary packed, not hex
+
+				$dbw =& wfGetDB( DB_MASTER );
+				$dbw->replace( 'math', array( 'math_inputhash' ),
+				  array(
+					'math_inputhash' => $md5_sql,
+					'math_outputhash' => $outmd5_sql,
+					'math_html_conservativeness' => $this->conservativeness,
+					'math_html' => $this->html,
+					'math_mathml' => $this->mathml,
+				  ), $fname, array( 'IGNORE' )
+				);
+			}
+
+		}
+
+		return $this->_doRender();
+	}
+
+	function _error( $msg, $append = '' ) {
+		$mf   = htmlspecialchars( wfMsg( 'math_failure' ) );
+		$errmsg = htmlspecialchars( wfMsg( $msg ) );
+		$source = htmlspecialchars( str_replace( "\n", ' ', $this->tex ) );
+		return "<strong class='error'>$mf ($errmsg$append): $source</strong>\n";
+	}
+
+	function _recall() {
+		global $wgMathDirectory;
+		$fname = 'MathRenderer::_recall';
+
+		$this->md5 = md5( $this->tex );
+		$dbr =& wfGetDB( DB_SLAVE );
+		$rpage = $dbr->selectRow( 'math',
+			array( 'math_outputhash','math_html_conservativeness','math_html','math_mathml' ),
+			array( 'math_inputhash' => pack("H32", $this->md5)), # Binary packed, not hex
+			$fname
+		);
+
+		if( $rpage !== false ) {
+			# Tailing 0x20s can get dropped by the database, add it back on if necessary:
+			$xhash = unpack( 'H32md5', $rpage->math_outputhash . "                " );
+			$this->hash = $xhash ['md5'];
+
+			$this->conservativeness = $rpage->math_html_conservativeness;
+			$this->html = $rpage->math_html;
+			$this->mathml = $rpage->math_mathml;
+
+			if( file_exists( $this->_getHashPath() . "/{$this->hash}.png" ) ) {
+				return true;
+			}
+
+			if( file_exists( $wgMathDirectory . "/{$this->hash}.png" ) ) {
+				$hashpath = $this->_getHashPath();
+
+				if( !file_exists( $hashpath ) ) {
+					if( !@wfMkdirParents( $hashpath, 0755 ) ) {
+						return false;
+					}
+				} elseif( !is_dir( $hashpath ) || !is_writable( $hashpath ) ) {
+					return false;
+				}
+				if ( function_exists( "link" ) ) {
+					return link ( $wgMathDirectory . "/{$this->hash}.png",
+							$hashpath . "/{$this->hash}.png" );
+				} else {
+					return rename ( $wgMathDirectory . "/{$this->hash}.png",
+							$hashpath . "/{$this->hash}.png" );
+				}
+			}
+
+		}
+
+		# Missing from the database and/or the render cache
+		return false;
+	}
+
+	/**
+	 * Select among PNG, HTML, or MathML output depending on
+	 */
+	function _doRender() {
+		if( $this->mode == MW_MATH_MATHML && $this->mathml != '' ) {
+			return "<math xmlns='http://www.w3.org/1998/Math/MathML'>{$this->mathml}</math>";
+		}
+		if (($this->mode == MW_MATH_PNG) || ($this->html == '') ||
+		   (($this->mode == MW_MATH_SIMPLE) && ($this->conservativeness != 2)) ||
+		   (($this->mode == MW_MATH_MODERN || $this->mode == MW_MATH_MATHML) && ($this->conservativeness == 0))) {
+			return $this->_linkToMathImage();
+		} else {
+			return '<span class="texhtml">'.$this->html.'</span>';
+		}
+	}
+
+	function _linkToMathImage() {
+		global $wgMathPath;
+		$url = htmlspecialchars( "$wgMathPath/" . substr($this->hash, 0, 1)
+					.'/'. substr($this->hash, 1, 1) .'/'. substr($this->hash, 2, 1)
+					. "/{$this->hash}.png" );
+		$alt = trim(str_replace("\n", ' ', htmlspecialchars( $this->tex )));
+		return "<img class='tex' src=\"$url\" alt=\"$alt\" />";
+	}
+
+	function _getHashPath() {
+		global $wgMathDirectory;
+		$path = $wgMathDirectory .'/'. substr($this->hash, 0, 1)
+					.'/'. substr($this->hash, 1, 1)
+					.'/'. substr($this->hash, 2, 1);
+		wfDebug( "TeX: getHashPath, hash is: $this->hash, path is: $path\n" );
+		return $path;
+	}
+
+	function renderMath( $tex ) {
+		global $wgUser;
+		$math = new MathRenderer( $tex );
+		$math->setOutputMode( $wgUser->getOption('math'));
+		return $math->render();
+	}
+}
+?>