Hast du nen Link zu dem erwähnten Doku-Wiki-Plugin?
http://wiki.erazor-zone.de/doku.php?id=wiki:projects:php:dokuwiki:plugins:lat ex
Quellcode:
<?php
/**
* LaTeX Rendering Class
* Copyright (C) 2003 Benjamin Zeiss <zeiss@math.uni-goettingen.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* --------------------------------------------------------------------
* @author Benjamin Zeiss <zeiss@math.uni-goettingen.de>
* @version v0.8
* @package latexrender
*
*/
class LatexRender {
// ================================================== ==================================
// Variable Definitions
// ================================================== ==================================
var $_picture_path = "";
var $_picture_path_httpd = "";
var $_tmp_dir = "";
// i was too lazy to write mutator functions for every single program used
// just access it outside the class or change it here if nescessary
var $_latex_path = "/usr/bin/latex";
var $_dvips_path = "/usr/bin/dvips";
var $_convert_path = "/usr/bin/convert";
var $_identify_path="/usr/bin/identify";
var $_formula_density = 120;
var $_xsize_limit = 500;
var $_ysize_limit = 500;
var $_string_length_limit = 500;
var $_font_size = 10;
var $_latexclass = "article"; //install extarticle class if you wish to have smaller font sizes
var $_tmp_filename;
var $_image_format = "png"; //change to png if you prefer
// this most certainly needs to be extended. in the long term it is planned to use
// a positive list for more security. this is hopefully enough for now. i'd be glad
// to receive more bad tags !
var $_latex_tags_blacklist = array(
"include","def","command","loop","repeat","open","toks","output","input",
"catcode","name","^^",
"\\every","\\errhelp","\\errorstopmode","\\scrollmode","\\nonstopmode","\\batchmode",
"\\read","\\write","csname","\\newhelp","\\uppercase", "\\lowercase","\\relax","\\aftergroup",
"\\afterassignment","\\expandafter","\\noexpand","\\special"
);
var $_errorcode = 0;
var $_errorextra = "";
// ================================================== ==================================
// constructor
// ================================================== ==================================
/**
* Initializes the class
*
* @param string path where the rendered pictures should be stored
* @param string same path, but from the httpd chroot
*/
function LatexRender($picture_path,$picture_path_httpd,$tmp _dir) {
$this->_picture_path = $picture_path;
$this->_picture_path_httpd = $picture_path_httpd;
$this->_tmp_dir = $tmp_dir;
$this->_tmp_filename = md5(rand());
}
// ================================================== ==================================
// public functions
// ================================================== ==================================
/**
* Picture path Mutator function
*
* @param string sets the current picture path to a new location
*/
function setPicturePath($name) {
$this->_picture_path = $name;
}
/**
* Picture path Mutator function
*
* @returns the current picture path
*/
function getPicturePath() {
return $this->_picture_path;
}
/**
* Picture path HTTPD Mutator function
*
* @param string sets the current httpd picture path to a new location
*/
function setPicturePathHTTPD($name) {
$this->_picture_path_httpd = $name;
}
/**
* Picture path HTTPD Mutator function
*
* @returns the current picture path
*/
function getPicturePathHTTPD() {
return $this->_picture_path_httpd;
}
/**
* Tries to match the LaTeX Formula given as argument against the
* formula cache. If the picture has not been rendered before, it'll
* try to render the formula and drop it in the picture cache directory.
*
* @param string formula in LaTeX format
* @returns the webserver based URL to a picture which contains the
* requested LaTeX formula. If anything fails, the resultvalue is false.
*/
function getFormulaURL($latex_formula) {
// circumvent certain security functions of web-software which
// is pretty pointless right here
$latex_formula = preg_replace("/>/i", ">", $latex_formula);
$latex_formula = preg_replace("/</i", "<", $latex_formula);
$formula_hash = md5($latex_formula);
$filename = $formula_hash.".".$this->_image_format;
$full_path_filename = $this->getPicturePath()."/".$filename;
if (is_file($full_path_filename)) {
return $this->getPicturePathHTTPD()."/".$filename;
} else {
// security filter: reject too long formulas
if (strlen($latex_formula) > $this->_string_length_limit) {
$this->_errorcode = 1;
return false;
}
// security filter: try to match against LaTeX-Tags Blacklist
for ($i=0;$i<sizeof($this->_latex_tags_blacklist);$i++) {
if (stristr($latex_formula,$this->_latex_tags_blacklist[$i])) {
$this->_errorcode = 2;
return false;
}
}
// security checks assume correct formula, let's render it
if ($this->renderLatex($latex_formula)) {
return $this->getPicturePathHTTPD()."/".$filename;
} else {
// uncomment if required
// $this->_errorcode = 3;
return false;
}
}
}
// ================================================== ==================================
// private functions
// ================================================== ==================================
/**
* wraps a minimalistic LaTeX document around the formula and returns a string
* containing the whole document as string. Customize if you want other fonts for
* example.
*
* @param string formula in LaTeX format
* @returns minimalistic LaTeX document containing the given formula
*/
function wrap_formula($latex_formula) {
$string = "\documentclass[".$this->_font_size."pt]{".$this->_latexclass."}\n";
//$string .= "\usepackage[latin1]{inputenc}\n";
$string .= "\usepackage{amsmath}\n";
$string .= "\usepackage{amsfonts}\n";
$string .= "\usepackage{eurosym}\n";
$string .= "\usepackage{ucs}\n";
$string .= "\usepackage[utf8x]{inputenc}\n";
$string .= "\usepackage{amssymb}\n";
$string .= "\pagestyle{empty}\n";
$string .= "\begin{document}\n";
$string .= "$".$latex_formula."$\n";
$string .= "\end{document}\n";
return $string;
}
/**
* returns the dimensions of a picture file using 'identify' of the
* imagemagick tools. The resulting array can be adressed with either
* $dim[0] / $dim[1] or $dim["x"] / $dim["y"]
*
* @param string path to a picture
* @returns array containing the picture dimensions
*/
function getDimensions($filename) {
$output=exec($this->_identify_path." ".$filename);
$result=explode(" ",$output);
$dim=explode("x",$result[2]);
$dim["x"] = $dim[0];
$dim["y"] = $dim[1];
return $dim;
}
/**
* Renders a LaTeX formula by the using the following method:
* - write the formula into a wrapped tex-file in a temporary directory
* and change to it
* - Create a DVI file using latex (tetex)
* - Convert DVI file to Postscript (PS) using dvips (tetex)
* - convert, trim and add transparancy by using 'convert' from the
* imagemagick package.
* - Save the resulting image to the picture cache directory using an
* md5 hash as filename. Already rendered formulas can be found directly
* this way.
*
* @param string LaTeX formula
* @returns true if the picture has been successfully saved to the picture
* cache directory
*/
function renderLatex($latex_formula) {
$latex_document = $this->wrap_formula($latex_formula);
$current_dir = getcwd();
chdir($this->_tmp_dir);
// create temporary latex file
$fp = fopen($this->_tmp_dir."/".$this->_tmp_filename.".tex","a+");
fputs($fp,$latex_document);
fclose($fp);
// create temporary dvi file
$command = $this->_latex_path." --interaction=nonstopmode ".$this->_tmp_filename.".tex";
$status_code = exec($command);
if (!$status_code) { $this->cleanTemporaryDirectory(); chdir($current_dir); $this->_errorcode = 4; return false; }
// convert dvi file to postscript using dvips
$command = $this->_dvips_path." -E ".$this->_tmp_filename.".dvi"." -o ".$this->_tmp_filename.".ps";
$status_code = exec($command);
// imagemagick convert ps to image and trim picture
$command = $this->_convert_path." -density ".$this->_formula_density.
" -trim -transparent \"#FFFFFF\" ".$this->_tmp_filename.".ps ".
$this->_tmp_filename.".".$this->_image_format;
$status_code = exec($command);
// test picture for correct dimensions
$dim = $this->getDimensions($this->_tmp_filename.".".$this->_image_format);
if ( ($dim["x"] > $this->_xsize_limit) or ($dim["y"] > $this->_ysize_limit)) {
$this->cleanTemporaryDirectory();
chdir($current_dir);
$this->_errorcode = 5;
$this->_errorextra = ": " . $dim["x"] . "x" . number_format($dim["y"],0,"","");
return false;
}
// copy temporary formula file to cahed formula directory
$latex_hash = md5($latex_formula);
$filename = $this->getPicturePath()."/".$latex_hash.".".$this->_image_format;
$status_code = copy($this->_tmp_filename.".".$this->_image_format,$filename);
$this->cleanTemporaryDirectory();
if (!$status_code) { chdir($current_dir); $this->_errorcode = 6; return false; }
chdir($current_dir);
return true;
}
/**
* Cleans the temporary directory
*/
function cleanTemporaryDirectory() {
$current_dir = getcwd();
chdir($this->_tmp_dir);
unlink($this->_tmp_dir."/".$this->_tmp_filename.".tex");
unlink($this->_tmp_dir."/".$this->_tmp_filename.".aux");
unlink($this->_tmp_dir."/".$this->_tmp_filename.".log");
unlink($this->_tmp_dir."/".$this->_tmp_filename.".dvi");
unlink($this->_tmp_dir."/".$this->_tmp_filename.".ps");
unlink($this->_tmp_dir."/".$this->_tmp_filename.".".$this->_image_format);
chdir($current_dir);
}
}
?>
Und noch nähere Informationen bezüglich Synthaxhighlighting (geshi-plugin und vBulletin)?
bzgl vBulletin kann ich nicht viel sagen, aber die Syntax zum Highlighting für LaTeX geht auf meine Kappe (http://www.pospiech.eu/blog/2007/06/25/syntaxhighlighting-von-latex-in-webseiten/)
Was man für Geshi nur benötigt ist ein Wrapper der es in VBulletin einbindet. Geshi ist quasi eine Software (PHP Klasse) die unabhängig von der Oberfläche (forum, blog etc) immer den gleichen HTML Quellcode ausgibt und über PHP angesprochen werden muss.
In wordpress sieht das dann z.B. so aus (Auschnitt)
include_once("geshi/geshi.php");
function wp_syntax_highlight($match)
{
global $wp_syntax_matches;
$i = intval($match[1]);
$match = $wp_syntax_matches[$i];
$language = strtolower(trim($match[1]));
$line = trim($match[2]);
$code = wp_syntax_code_trim($match[3]);
$geshi = new GeSHi($code, $language);
$geshi->enable_keyword_links(false);
$output = "\n<div class=\"wp_syntax\">";
if ($line)
{
$output .= "<table><tr><td class=\"line_numbers\">";
$output .= wp_syntax_line_numbers($code, $line);
$output .= "</td><td class=\"code\">";
$output .= $geshi->parse_code();
$output .= "</td></tr></table>";
}
else
{
$output .= "<div class=\"code\">";
$output .= $geshi->parse_code();
$output .= "</div>";
}
return
$output .= "</div>\n";
return $output;
}
Matthias