public static cSet <cConfiguration> cm_Closure(cSet <cConfiguration> a_listConfiguration)
{
bool _added = false;
if (a_listConfiguration != null)
{
cSet <cConfiguration> _retList = a_listConfiguration.Clone() as cSet <cConfiguration>;
cSet <cConfiguration> _addRetList = new cSet <cConfiguration>();
do
{
_addRetList.Clear();
foreach (cConfiguration _configuration in _retList)
{
if (_configuration.cf_Production.cp_RightPart.Count > _configuration.cf_Position)
{
cLexem _lexem = _configuration.cf_Production.cp_RightPart[_configuration.cf_Position];
if (_lexem.cp_Type == eLexType.NonTerminal)
{
List <cLexem> _listTerminals = new List <cLexem>();
_listTerminals.AddRange(_configuration.cf_Production.cp_RightPart.GetRange(_configuration.cf_Position + 1, _configuration.cf_Production.cp_RightPart.Count - _configuration.cf_Position - 1));
_listTerminals.Add(_configuration.cf_Terminal);
cSet <cLexem> _firstTerminals = cm_FirstTerminals(_listTerminals);
foreach (cProduction _production in _lexem.cp_ListProducts)
{
foreach (cLexem _terminal in _firstTerminals)
{
cConfiguration _newConfiguration = cConfiguration.cm_GetConfiguration(_production, 0, _terminal);
_addRetList.Add(_newConfiguration);
}
}
}
}
}
_added = _retList.AddRange(_addRetList);
} while (_added == true);
return(_retList);
}
else
{
return(new cSet <cConfiguration>());
}
}
public void cm_Init(cParser a_parser)
{
cf_valid = false;
cf_root = a_parser.cp_Root;
// Заполнение множества FOLLOW
cf_follow = new Dictionary <cLexem, cSet <cLexem> >();
foreach (cLexem _nonTerminal in cp_Lexems)
{
if (_nonTerminal.cp_Type == eLexType.NonTerminal)
{
cf_follow[_nonTerminal] = new cSet <cLexem>();
}
}
// 2
cSet <cLexem> _first = new cSet <cLexem>();
foreach (cLexem _nonTerminal in cp_Lexems)
{
if (_nonTerminal.cp_Type == eLexType.NonTerminal)
{
foreach (List <cLexem> _lstLex in _nonTerminal.cp_ListProducts.Values)
{
int _count = _lstLex.Count;
_first.Clear();
for (int i = _lstLex.Count - 1; i >= 0; i--)
{
cLexem _lex = _lstLex[i];
switch (_lex.cp_Type)
{
case eLexType.NonTerminal:
cf_follow[_lex].AddRange(_first);
if (!_lex.cm_IsLeadingLexem(cLexem.cc_EpsilonLexem))
{
_first.Clear();
}
_first.AddRange(_lex.cp_LeadLexems);
break;
case eLexType.Terminal:
_first.Clear();
_first.Add(_lex);
break;
case eLexType.Epsilon:
_first.Clear();
break;
}
}
}
}
}
// 3
bool _added = true;
while (_added)
{
_added = false;
foreach (cLexem _nonTerminal in cp_Lexems)
{
if (_nonTerminal.cp_Type == eLexType.NonTerminal)
{
foreach (List <cLexem> _lstLex in _nonTerminal.cp_ListProducts.Values)
{
int _count = _lstLex.Count;
_first.Clear();
bool _break = false;
for (int i = _lstLex.Count - 1; i >= 0; i--)
{
cLexem _lex = _lstLex[i];
switch (_lex.cp_Type)
{
case eLexType.NonTerminal:
cf_follow[_lex].AddRange(_first);
if (!_lex.cm_IsLeadingLexem(cLexem.cc_EpsilonLexem))
{
_break = true;
}
//else
_added = cf_follow[_lex].AddRange(cf_follow[_nonTerminal]) | _added;
break;
case eLexType.Action:
break;
default:
_break = true;
break;
}
if (_break)
{
break;
}
}
}
}
}
}
cf_valid = true;
}