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var sIndentDef = "  ";  // Tab or spaces can be used for indentation.

if (UltraEdit.document.length > 0)  // Is any file opened?
{
   // Define environment for this script.
   UltraEdit.insertMode();
   if (typeof(UltraEdit.columnModeOff) == "function") UltraEdit.columnModeOff();
   else if (typeof(UltraEdit.activeDocument.columnModeOff) == "function") UltraEdit.activeDocument.columnModeOff();

   // Load selection into a string variable, or if nothing is
   // selected and the active file has the file extension CSS,
   // load everything in CSS file into a string variable.
   var sBlock;
   var nColumn = 0;
   var nLineNumber = 0;
   if (UltraEdit.activeDocument.isSel())
   {
      sBlock = UltraEdit.activeDocument.selection;
   }
   else if (UltraEdit.activeDocument.isExt("css"))
   {
      nColumn = UltraEdit.activeDocument.currentColumnNum;
      nLineNumber = UltraEdit.activeDocument.currentLineNum;
      UltraEdit.activeDocument.selectAll();
      sBlock = UltraEdit.activeDocument.selection;
   }

   // Is there anything loaded to reformat?
   if (sBlock.length)
   {
      var nInitialLength = sBlock.length;

      // Determine line termination type of active file.
      var sLineTerm;
      if (typeof(UltraEdit.activeDocument.lineTerminator) == "number")
      {
         if (UltraEdit.activeDocument.lineTerminator < 1) sLineTerm = "\r\n";
         else if (UltraEdit.activeDocument.lineTerminator == 1) sLineTerm = "\n";
         else sLineTerm = "\r";
      }
      else sLineTerm = "\r\n";

      // Remove trailing spaces and tabs from each line in block.
      sBlock = sBlock.replace(/[\t ]+([\r\n])/g,"$1");

      // Remove tabs and spaces around { and } in block.
      sBlock = sBlock.replace(/[\t ]*([{}])[\t ]*/g,"$1");

      // Insert a single space left of each { in block.
      sBlock = sBlock.replace(/{/g," {");

      // Insert line termination after { and after } and after ;
      // and after */ if there is not already a line terminator.
      do
      {
         var nLength = sBlock.length;
         sBlock = sBlock.replace(/([{};]|\*\/)([^\r\n])/g,"$1"+ sLineTerm + "$2");
      }
      while(nLength < sBlock.length);

      // Insert line termination before each } with no line termination already present.
      sBlock = sBlock.replace(/([^\r\n])}/g,"$1" + sLineTerm + "}");

      // Insert an empty line above each block comment and above a line with {
      // with no empty line or a line ending with { above already present in block.
      sBlock = sBlock.replace(/([^\r\n{])((?:\r?\n|\r)[ \t]*(?:\/\*|.* \{))/g,"$1" + sLineTerm + "$2");

      // Split up the block into an array of strings with each string being a line.
      var asLines = sBlock.split(sLineTerm);

      // Re-indent the lines whereby ignoring lines within a
      // block comment starting already with a space or tab.
      var bBlockComment = false;
      var sCurrentIndent = "";
      for (var nLine = 0; nLine < asLines.length; nLine++)
      {
         if (asLines[nLine] == "}")
         {
            if (sCurrentIndent.length)
            {
               sCurrentIndent = sCurrentIndent.substr(sIndentDef.length);
            }
            if (sCurrentIndent.length)
            {
               asLines[nLine] = sCurrentIndent + "}";
            }
            continue;
         }

         if (!bBlockComment)
         {
            asLines[nLine] = sCurrentIndent + asLines[nLine].replace(/^[\t ]+/,"");
         }
         else if (asLines[nLine].search(/^[\t ]/) < 0)
         {
            asLines[nLine] = sCurrentIndent + asLines[nLine];
         }

         var asCommentOnOff = asLines[nLine].match(/\/\*|\*\//g);
         if (asCommentOnOff)
         {
            for (var nComment = 0; nComment < asCommentOnOff.length; nComment++)
            {
               bBlockComment = (asCommentOnOff[nComment] == "/*") ? true : false;
            }
         }

         if (asLines[nLine][asLines[nLine].length-1] == "{")
         {
            sCurrentIndent += sIndentDef;
         }
      }

      // Join the lines back to a block.
      sBlock = asLines.join(sLineTerm);

      // Was the block modified at all determined by checking only length?
      if (nInitialLength != sBlock.length)
      {
         UltraEdit.activeDocument.write(sBlock);
      }
      else
      {
         if (nLineNumber)
         {
            UltraEdit.activeDocument.gotoLine(nLineNumber,nColumn);
         }
         UltraEdit.messageBox("Nothing modified.","CSS reformatter");
      }
   }
}