text: /* ***** BEGIN LICENSE BLOCK *****
   * Distributed under the BSD license:
   *
   * Copyright (c) 2010, Ajax.org B.V.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in the
   *       documentation and/or other materials provided with the distribution.
   *     * Neither the name of Ajax.org B.V. nor the
   *       names of its contributors may be used to endorse or promote products
   *       derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * ***** END LICENSE BLOCK ***** */
  
  define(function(require, exports, module) {
  "use strict";
  
  var oop = require("../../lib/oop");
  var Range = require("../../range").Range;
  var CFoldMode = require("./cstyle").FoldMode;
  
  var FoldMode = exports.FoldMode = function(commentRegex) {
      if (commentRegex) {
          this.foldingStartMarker = new RegExp(
              this.foldingStartMarker.source.replace(/\|[^|]*?$/, "|" + commentRegex.start)
          );
          this.foldingStopMarker = new RegExp(
              this.foldingStopMarker.source.replace(/\|[^|]*?$/, "|" + commentRegex.end)
          );
      }
  };
  oop.inherits(FoldMode, CFoldMode);
  
  (function() {
      this.usingRe = /^\s*using \S/;
  
      this.getFoldWidgetRangeBase = this.getFoldWidgetRange;
      this.getFoldWidgetBase = this.getFoldWidget;
      
      this.getFoldWidget = function(session, foldStyle, row) {
          var fw = this.getFoldWidgetBase(session, foldStyle, row);
          if (!fw) {
              var line = session.getLine(row);
              if (/^\s*#region\b/.test(line)) 
                  return "start";
              var usingRe = this.usingRe;
              if (usingRe.test(line)) {
                  var prev = session.getLine(row - 1);
                  var next = session.getLine(row + 1);
                  if (!usingRe.test(prev) && usingRe.test(next))
                      return "start"
              }
          }
          return fw;
      };
      
      this.getFoldWidgetRange = function(session, foldStyle, row) {
          var range = this.getFoldWidgetRangeBase(session, foldStyle, row);
          if (range)
              return range;
  
          var line = session.getLine(row);
          if (this.usingRe.test(line))
              return this.getUsingStatementBlock(session, line, row);
              
          if (/^\s*#region\b/.test(line))
              return this.getRegionBlock(session, line, row);
      };
      
      this.getUsingStatementBlock = function(session, line, row) {
          var startColumn = line.match(this.usingRe)[0].length - 1;
          var maxRow = session.getLength();
          var startRow = row;
          var endRow = row;
  
          while (++row < maxRow) {
              line = session.getLine(row);
              if (/^\s*$/.test(line))
                  continue;
              if (!this.usingRe.test(line))
                  break;
  
              endRow = row;
          }
  
          if (endRow > startRow) {
              var endColumn = session.getLine(endRow).length;
              return new Range(startRow, startColumn, endRow, endColumn);
          }
      };
      
      this.getRegionBlock = function(session, line, row) {
          var startColumn = line.search(/\s*$/);
          var maxRow = session.getLength();
          var startRow = row;
          
          var re = /^\s*#(end)?region\b/
          var depth = 1
          while (++row < maxRow) {
              line = session.getLine(row);
              var m = re.exec(line);
              if (!m)
                  continue;
              if (m[1])
                  depth--;
              else
                  depth++;
  
              if (!depth)
                  break;
          }
  
          var endRow = row;
          if (endRow > startRow) {
              var endColumn = line.search(/\S/);
              return new Range(startRow, startColumn, endRow, endColumn);
          }
      };
  
  }).call(FoldMode.prototype);
  
  });
  