latex 2 html

latex2html.php

<?php
function latex2html($text){  
	  $s[] = '/\\\\begin{theorem}\\[(.*?)\\]\\s/';
	  $r[] = '<blockquote class="theorem"><strong>Theorem ($1)</strong> ';
	  $s[] = '/\\\\begin{lemma}\\[(.*?)\\]\\s/';
	  $r[] = '<blockquote class="theorem"><strong>Lemma ($1)</strong> ';
	  $s[] = '/\\\\begin{problem}\\[(.*?)\\]\\s/';
	  $r[] = '<blockquote class="problem"><strong>Problem ($1)</strong> ';
	  $s[] = '/\\\\begin{corollary}\\[(.*?)\\]\\s/';
	  $r[] = '<blockquote class="theorem"><strong>Corollary ($1)</strong> ';
	  $s[] = '/\\\\begin{definition}\\[(.*?)\\]\\s/';
	  $r[] = '<blockquote class="definition"><strong>Definition ($1)</strong> ';
	  $s[] = '/\\\\begin{conjecture}\\[(.*?)\\]\\s/';
	  $r[] = '<blockquote class="conjecture"><strong>Conjecture ($1)</strong> ';
	 
	  $s[] = '/\\\\texttt{(.*?)}/s';
	  $r[] = '<code>$1</code>';
	  
	  $s[] = '/\\\\textbf{(.*?)}/s';
	  $r[] = '<strong>$1</strong>';
	  
	  $s[] = '/\\\\emph{(.*?)}/s';
	  $r[] = '<em>$1</em>';
	  
	  $s[] = '/\\\\textsc{(.*?)}/s';
	  $r[] = '<span style="font-variant: small-caps;">$1</span>';
	  
	  $s[] = '/\\\\begin{enumerate}\\s*\\\\item/s';
	  $r[] = '<ol><li>';
	  $s[] = '/\\\\end{enumerate}/';
	  $r[] = '</li></ol>';
	  $s[] = '/\\\\begin{itemize}\\s*\\\\item/';
	  $r[] = '<ul><li>';
	  $s[] = '/\\\\end{itemize}/s';
	  $r[] = '</li></ul>';
	  
	  $s[] = '/\\\\begin{theorem}\\s*/s';
	  $r[] = '<blockquote class="theorem"><strong>Theorem</strong> ';
	  $s[] = '/\\\\begin{lemma}\\s*/s';
	  $r[] = '<blockquote class="theorem"><strong>Lemma</strong> ';
	  $s[] = '/\\\\begin{problem}\\s*/s';
	  $r[] = '<blockquote class="problem"><strong>Problem</strong> ';
	  $s[] = '/\\\\begin{corollary}\\s*/s';
	  $r[] = '<blockquote class="theorem"><strong>Corollary</strong> ';
	  $s[] = '/\\\\begin{definition}\\s*/s';
	  $r[] = '<blockquote class="definition"><strong>Definition</strong> ';
	  $s[] = '/\\\\begin{conjecture}\\s*/s';
	  $r[] = '<blockquote class="conjecture"><strong>Conjecture</strong> ';
	  $s[] = '/\\s*\\\\end{proof}/s';
	  $r[] = '<span style="float:right;font-size:200%">&#9632;</span>';
	  
	  $s[] = '/\\\\begin{example}\\s*/s';
	  $r[] = '<blockquote>strong>Example</strong> ';
	  $s[] = '/\\\\begin{proof}\\s*/s';
	  $r[] = '<strong>Proof</strong> ';
	  $s[] = '/\\\\begin{remark}\\s*/s';
	  $r[] = '<blockquote><strong>Remark</strong> ';
	  $s[] = '/\\\\begin{quotation}\\s*/s';
	  $r[] = '<blockquote>';
	  
	  $s[] = '/\\\\href{(.*?)}{(.*?)}/';
	  $r[] = '<a href="$1">$2</a>';
	  $s[] = '/\\\\url{(.*?)}/';
	  $r[] = '<a href="$1">$1</a>';
	  $s[] = '/\\\\includegraphics{(.*?)}/';
	  $r[] = '<img src="$1" />';
	  $s[] = '/\\\\section\\*{(.*?)}/';
	  $r[] = '<h3>$1</h3>';
	  $s[] = '/\\\\subsection\\*{(.*?)}/';
	  $r[] = '<h4>$1</h4>';
	  
	  $text = preg_replace($s,$r,$text);

	  unset($s,$r);
	  
	  
	  $s[] = '\\item ';
	  $r[] = '</li><li>';
	  
	  
	  
	  $s[] = '\\end{theorem}';
	  $s[] = '\\end{lemma}';
	  $s[] = '\\end{problem}';
	  $s[] = '\\end{corollary}';
	  $s[] = '\\end{definition}';
	  $s[] = '\\end{example}';
	  $s[] = '\\end{remark}';
	  $s[] = '\\end{quotation}';
	  $s[] = '\\end{conjecture}';
	  for($j=0;$j<9;$j++){
		  $r[] = '</blockquote>';
	  }
	  $text = str_replace($s,$r,$text);

	  preg_match_all('/\\\\begin{align\\*}(.*?)\\\\end{align\\*}/si',$text,$tex_matches);
	  $text = replacealign($text,$tex_matches);
	  preg_match_all('/\\\\\[(.*?)\\\\\]/si',$text,$tex_matches);
      $text = replace($text,$tex_matches,'\displaystyle{','}','class="displaystyle"');
      preg_match_all('/^\$(.*?[^\\\\])\$/si',$text,$tex_matches);
      $text = replace($text,$tex_matches);
      preg_match_all('/[^\\\\]\$(.*?[^\\\\])\$/si',$text,$tex_matches);
      $text = replace($text,$tex_matches);
      $text = str_replace('\\$','&#36;',$text);
      return $text;
}

function alt($s){
        $s = htmlentities(trim($s), ENT_QUOTES);
        $s = str_replace(array("\r","\n"),array("&#13;","&#10;"),$s);
	return $s;
}

function replace($text, $tex_matches, $prefix="", $suffix="", $class=""){
      for ($i=0; $i < count($tex_matches[0]); $i++) {
        $pos = strpos($text, $tex_matches[0][$i]);
        $formula = $prefix.trim($tex_matches[1][$i]).$suffix;
        $alt_formula = alt($tex_matches[1][$i]);
		$replace = '<img '.$class.' src="http://s2.wordpress.com/latex.php?latex=' . rawurlencode($formula) . '&bg=ffffff&fg=000000" title="'.$alt_formula.'" alt="'.$alt_formula.'">';
	if($tex_matches[0][$i][0]!="$" && $tex_matches[0][$i][0]!="\\"){
		$replace = $tex_matches[0][$i][0].$replace;
	}
        $text = substr_replace($text, $replace, $pos,strlen($tex_matches[0][$i]));
      }
      return $text;
}
function replacealign($text, $tex_matches){
	  for ($i=0; $i < count($tex_matches[0]); $i++) {
        $pos = strpos($text, $tex_matches[0][$i]);
        $formula = '\\eqalign{'.trim($tex_matches[1][$i]).'}';
        $alt_formula = alt($tex_matches[1][$i]);
		$formula = str_replace('\\\\','\\cr',$formula);
		$replace = '<img class="displaystyle" src="http://www.mathtran.org/cgi-bin/mathtran?D=1;tex=' . rawurlencode($formula) . '" title="'.$alt_formula.'" alt="'.$alt_formula.'">';
	if($tex_matches[0][$i][0]!="$" && $tex_matches[0][$i][0]!="\\"){
		$replace = $tex_matches[0][$i][0].$replace;
	}
        $text = substr_replace($text, $replace, $pos,strlen($tex_matches[0][$i]));
      }
      return $text;
}