SOURCE CODE: Uize.Data.PathsTree.CompactString (view docs)

/*______________
|       ______  |   U I Z E    J A V A S C R I P T    F R A M E W O R K
|     /      /  |   ---------------------------------------------------
|    /    O /   |    MODULE : Uize.Data.PathsTree.CompactString Package
|   /    / /    |
|  /    / /  /| |    ONLINE : http://www.uize.com
| /____/ /__/_| | COPYRIGHT : (c)2011-2016 UIZE
|          /___ |   LICENSE : Available under MIT License or GNU General Public License
|_______________|             http://www.uize.com/license.html
*/

/* Module Meta Data
  type: Package
  importance: 1
  codeCompleteness: 100
  docCompleteness: 2
*/

/*?
  Introduction
    The =Uize.Data.PathsTree.CompactString= package provides methods for converting between a...

    *DEVELOPERS:* `Chris van Rensburg`
*/

Uize.module ({
  name:'Uize.Data.PathsTree.CompactString',
  builder:function () {
    'use strict';

    var
      /*** Variables for Scruncher Optimization ***/
        _sacredEmptyObject = {},
        _Uize_defaultNully = Uize.defaultNully
    ;

    return Uize.package ({
      fromCompactString:function (_compactStr,_encodingOptions) {
        _encodingOptions || (_encodingOptions = _sacredEmptyObject);
        var
          _opener = _Uize_defaultNully (_encodingOptions.opener,'[') + '',
          _closer = _Uize_defaultNully (_encodingOptions.closer,']') + '',
          _separator = _Uize_defaultNully (_encodingOptions.separator,'|') + '',
          _openerLength = _opener.length,
          _closerLength = _closer.length,
          _separatorLength = _separator.length,
          _tree = {},
          _levels = [_tree],
          _levelNode = _tree,
          _currentPos = 0,
          _compactStrLength = _compactStr.length,
          _compactStrLengthPlus1 = _compactStrLength + 1,
          _openerPos,
          _closerPos,
          _subPath,
          _delimPos,
          _lastDelimWasCloser
        ;
        while (_currentPos < _compactStrLength) {
          _subPath = _compactStr.slice (
            _currentPos,
            _delimPos = Math.min (
              _openerPos = ((_compactStr.indexOf (_opener,_currentPos) + 1) || _compactStrLengthPlus1) - 1,
              _closerPos = ((_compactStr.indexOf (_closer,_currentPos) + 1) || _compactStrLengthPlus1) - 1,
              ((_compactStr.indexOf (_separator,_currentPos) + 1) || _compactStrLengthPlus1) - 1
            )
          );
          _currentPos = _delimPos;
          if (_currentPos < _compactStrLength) {
            if (_delimPos == _openerPos) {
              _levels.push (_levelNode = _levelNode [_subPath] = {});
              _lastDelimWasCloser = false;
              _currentPos += _openerLength;
            } else {
              if (!_lastDelimWasCloser)
                _levelNode [_subPath] = 0
              ;
              if (_lastDelimWasCloser = _delimPos == _closerPos) {
                _levelNode = _levels [--_levels.length - 1];
                _currentPos += _closerLength;
              } else {
                _currentPos += _separatorLength;
              }
            }
            if (_currentPos == _compactStrLength && !_lastDelimWasCloser)
              _levelNode [''] = 0
            ;
          } else {
            _levelNode [_subPath] = 0;
          }
        }
        return _levels [0];
      },

      toCompactString:function (_tree,_encodingOptions) {
        _encodingOptions || (_encodingOptions = _sacredEmptyObject);
        var
          _opener = _Uize_defaultNully (_encodingOptions.opener,'[') + '',
          _closer = _Uize_defaultNully (_encodingOptions.closer,']') + '',
          _separator = _Uize_defaultNully (_encodingOptions.separator,'|') + ''
        ;
        function _toCompactString (_tree) {
          if (typeof _tree != 'object' || !_tree) return null;
          var _paths = [];
          for (var _path in _tree) {
            var _pathSubPathsAsCompactStr = _toCompactString (_tree [_path]);
            _paths.push (
              _path +
              (
                _pathSubPathsAsCompactStr != null
                  ? _opener + _pathSubPathsAsCompactStr + _closer
                  : ''
              )
            );
          }
          return _paths.join (_separator);
        }
        return _toCompactString (_tree) || '';
      }
    });
  }
});