/*global module:true*/
 /*
  * Basic table support with re-entrant parsing, where cell content
  * can also specify markdown.
  *
  * Tables
  * ======
  *
  * | Col 1   | Col 2                                              |
  * |======== |====================================================|
  * |**bold** | ![Valid XHTML] (http://w3.org/Icons/valid-xhtml10) |
  * | Plain   | Value                                              |
  *
  */
 
 (function(){
   var table = function(converter) {
     var tables = {}, style = 'text-align:left;', filter; 
     tables.th = function(header){
       if (header.trim() === "") { return "";}
       var id = header.trim().replace(/ /g, '_').toLowerCase();
       return '<th id="' + id + '" style="'+style+'">' + header + '</th>';
     };
     tables.td = function(cell) {
       return '<td style="'+style+'">' + converter.makeHtml(cell) + '</td>';
     };
     tables.ths = function(){
       var out = "", i = 0, hs = [].slice.apply(arguments);
       for (i;i<hs.length;i+=1) {
         out += tables.th(hs[i]) + '\n';
       }
       return out;
     };
     tables.tds = function(){
       var out = "", i = 0, ds = [].slice.apply(arguments);
       for (i;i<ds.length;i+=1) {
         out += tables.td(ds[i]) + '\n';
       }
       return out;
     };
     tables.thead = function() {
       var out, i = 0, hs = [].slice.apply(arguments);
       out = "<thead>\n";
       out += "<tr>\n";
       out += tables.ths.apply(this, hs);
       out += "</tr>\n";
       out += "</thead>\n";
       return out;
     };
     tables.tr = function() {
       var out, i = 0, cs = [].slice.apply(arguments);
       out = "<tr>\n";
       out += tables.tds.apply(this, cs);
       out += "</tr>\n";
       return out;
     };
     filter = function(text) { 
       var i=0, lines = text.split('\n'), tbl = [], line, hs, rows, out = [];
       for (i; i<lines.length;i+=1) {
         line = lines[i];
         // looks like a table heading
         if (line.trim().match(/^[|]{1}.*[|]{1}$/)) {
           line = line.trim();
           tbl.push('<table>');
           hs = line.substring(1, line.length -1).split('|');
           tbl.push(tables.thead.apply(this, hs));
           line = lines[++i];
           if (!line.trim().match(/^[|]{1}[-=| ]+[|]{1}$/)) {
             // not a table rolling back
             line = lines[--i];
           }
           else {
             line = lines[++i];
             tbl.push('<tbody>');
             while (line.trim().match(/^[|]{1}.*[|]{1}$/)) {
               line = line.trim();
               tbl.push(tables.tr.apply(this, line.substring(1, line.length -1).split('|')));
               line = lines[++i];
             }
             tbl.push('</tbody>');
             tbl.push('</table>');
             // we are done with this table and we move along
             out.push(tbl.join('\n'));
             tbl = [];
             continue;
           }
         }
         out.push(line);
       }             
       return out.join('\n');
     };
     return [
     { 
       type: 'lang', 
       filter: filter
     }
     ];
   };
 
   // Client-side export
   if (typeof window !== 'undefined' && window.Showdown && window.Showdown.extensions) { window.Showdown.extensions.table = table; }
   // Server-side export
   if (typeof module !== 'undefined') {
     module.exports = table;
   }
 }());