SOURCE CODE: Uize.Parse.Xml.TagOrAttributeName (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.Parse.Xml.TagOrAttributeName Class
|   /    / /    |
|  /    / /  /| |    ONLINE : http://uize.com
| /____/ /__/_| | COPYRIGHT : (c)2014-2016 UIZE
|          /___ |   LICENSE : Available under MIT License or GNU General Public License
|_______________|             http://uize.com/license.html
*/

/* Module Meta Data
  type: Class
  importance: 4
  codeCompleteness: 100
  docCompleteness: 2
*/

/*?
  Introduction
    The =Uize.Parse.Xml.TagOrAttributeName= module provides methods for parsing and serializing tag names or attribute names of XML tags.

    *DEVELOPERS:* `Chris van Rensburg`
*/

Uize.module ({
  name:'Uize.Parse.Xml.TagOrAttributeName',
  superclass:'Uize.Parse.Base',
  builder:function (_superclass) {
    'use strict';

    var
      /*** General Variables ***/
        _tagNameStartChars = '_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
        _tagNameStartCharsLookup = _charsLookup (_tagNameStartChars),
        _tagNameContinueCharsLookup = _charsLookup (_tagNameStartChars + '-0123456789')
    ;

    /*** Utility Functions ***/
      function _charsLookup (_charsStr) {
        return Uize.lookup (_charsStr.split (''));
      }

    return _superclass.subclass ({
      instanceProperties:{
        namespace:'',
        name:''
      },

      instanceMethods:{
        parse:function (_source,_index) {
          var
            m = this,
            _sourceLength = (m.source = _source).length
          ;
          m.index = _index || (_index = 0);
          m.namespace = m.name = '';
          m.isValid = false;
          if (_tagNameStartCharsLookup [_source.charAt (_index)]) {
            m.isValid = true;
            _index++;
            while (_index < _sourceLength && _tagNameContinueCharsLookup [_source.charAt (_index)])
              _index++
            ;
            if (_source.charAt (_index) == ':') {
              m.namespace = _source.slice (m.index,_index);
              var _namePos = ++_index;
              if (_tagNameStartCharsLookup [_source.charAt (_index)]) {
                _index++;
                while (_index < _sourceLength && _tagNameContinueCharsLookup [_source.charAt (_index)])
                  _index++
                ;
                m.name = _source.slice (_namePos,_index);
              }
            } else {
              m.name = _source.slice (m.index,_index);
            }
            m.length = _index - m.index;
          }
        },

        serialize:function () {
          var m = this;
          return m.isValid ? (m.namespace + (m.namespace && ':') + m.name) : '';
        }
      }
    });
  }
});