public ReduceEventArgs(Rule rule, NonterminalToken token, State newState)
{
this.rule = rule;
this.token = token;
this.newState = newState;
this.contin = true;
}
private void DoReleaseTokens(NonterminalToken token)
{
if ((StoreTokens == StoreTokensMode.Never) ||
(StoreTokens == StoreTokensMode.NoUserObject &&
token.UserObject != null))
{
token.ClearTokens();
}
}
private void DoReduce(Token token, ReduceAction action)
{
int reduceLength = action.Rule.Rhs.Length;
State currentState;
// Do not reduce if the rule is single nonterminal and TrimReductions is on
bool skipReduce = ((TrimReductions) &&
(reduceLength == 1) && (action.Rule.Rhs[0] is SymbolNonterminal));
if (skipReduce)
{
stateStack.Pop();
currentState = stateStack.Peek();
}
else
{
Token[] tokens = new Token[reduceLength];
for (int i = 0; i < reduceLength; i++)
{
stateStack.Pop();
tokens[reduceLength - i - 1] = tokenStack.Pop();
}
NonterminalToken nttoken = new NonterminalToken(action.Rule, tokens);
tokenStack.Push(nttoken);
currentState = stateStack.Peek();
if (OnReduce != null)
{
ReduceEventArgs args = new ReduceEventArgs(action.Rule,
nttoken,
currentState);
OnReduce(this, args);
DoReleaseTokens(args.Token);
continueParsing = args.Continue;
}
}
Action gotoAction = currentState.Actions.Get(action.Rule.Lhs);
if (gotoAction is GotoAction)
{
DoGoto(token, (GotoAction)gotoAction);
}
else
{
throw new ParserException("Invalid action table in state");
}
}
public AcceptEventArgs(NonterminalToken token)
{
this.token = token;
}
