public ProductionRule(string line)
{
string[] ruleAndConditions = line.Trim().Split('&');
//Parse the production rule
string[] ruleParts = ruleAndConditions[0].Trim().Split(' ');
Probability = Convert.ToDouble(ruleParts[0]);
LHS = new Symbol() { Type = SymbolType.Nonterminal, Text = ruleParts[1].Trim() };
List<Symbol> rhs = new List<Symbol>();
for (int i = 3; i < ruleParts.Length; i++)
{
Symbol newSymbol;
ruleParts[i] = ruleParts[i].Trim();
if (ruleParts[i].StartsWith(@"'"))
newSymbol = new Symbol() { Type = SymbolType.Terminal, Text = ruleParts[i].Replace('\'', ' ').Trim() };
else
newSymbol = new Symbol() { Type = SymbolType.Nonterminal, Text = ruleParts[i] };
rhs.Add(newSymbol);
}
RHS = rhs.ToArray();
//Parse the special conditions
if (ruleAndConditions.Length > 1)
Conditions = SpecialCondition.ParseConditions(ruleAndConditions[1]);
else
Conditions = new SpecialCondition[0];
}
private void AddRule(ProductionRule rule)
{
//ASSUMPTION: LHS of first rule in grammar file is root symbol
if (_rules.Count == 0)
{
_rootSymbol = rule.LHS;
_rhsIndex.Add(_rootSymbol.Text, new List<ProductionRule>());
}
_rules.Add(rule);
AddToLhsIndex(rule);
AddToRhsIndex(rule);
if (rule.RHS.Length == 1 && rule.RHS[0].Type == SymbolType.Terminal)
AddToTerminalIndex(rule);
if (rule.RHS[0].Type == SymbolType.Nonterminal)
AddToNonterminalIndex(rule);
}
