public void AddGoto(Symbol s, State next)
{
this.Goto[s] = next;
if (s is Terminal)
terminalTransitions.Add((Terminal)s);
else
nonTerminalTransitions.Add((NonTerminal)s, new Transition(this, (NonTerminal)s, next));
}
private void ExpandState(Symbol sym, State newState)
{
newState.accessedBy = sym;
this.states.Add(newState);
if (!this.accessedBy.ContainsKey(sym))
{
this.accessedBy[sym] = new List<State>();
}
this.accessedBy[sym].Add(newState);
newState.AddClosure();
this.ComputeGoto(newState);
}
private void ComputeGoto(State state)
{
foreach (ProductionItem current in state.all_items)
{
if (!current.expanded && !current.isReduction())
{
current.expanded = true;
Symbol symbol = current.production.rhs[current.pos];
List<ProductionItem> list = new List<ProductionItem>();
list.Add(new ProductionItem(current.production, current.pos + 1));
foreach (ProductionItem current2 in state.all_items)
{
if (!current2.expanded && !current2.isReduction())
{
Symbol symbol2 = current2.production.rhs[current2.pos];
if (symbol == symbol2)
{
current2.expanded = true;
list.Add(new ProductionItem(current2.production, current2.pos + 1));
}
}
}
State state2 = this.FindExistingState(symbol, list);
if (state2 == null)
{
State state3 = new State(list);
state.AddGoto(symbol, state3);
this.ExpandState(symbol, state3);
}
else
{
state.AddGoto(symbol, state2);
}
}
}
}
private void ComputeGoto(State state)
{
foreach (ProductionItem item in state.all_items)
if (!item.expanded && !item.isReduction())
{
item.expanded = true;
Symbol s1 = item.production.rhs[item.pos];
// Create itemset for new state ...
List<ProductionItem> itemSet = new List<ProductionItem>();
itemSet.Add(new ProductionItem(item.production, item.pos+1));
foreach (ProductionItem item2 in state.all_items)
if (!item2.expanded && !item2.isReduction())
{
Symbol s2 = item2.production.rhs[item2.pos];
if (s1 == s2)
{
item2.expanded = true;
itemSet.Add(new ProductionItem(item2.production, item2.pos+1));
}
}
State existingState = FindExistingState(s1, itemSet);
if (existingState == null)
{
State newState = new State(itemSet);
state.AddGoto(s1, newState);
ExpandState(s1, newState);
}
else
state.AddGoto(s1, existingState);
}
}
public Transition(State p, NonTerminal A, State next)
{
this.p = p;
this.A = A;
this.next = next;
}
private int GetDefaultAction(State state)
{
IEnumerator<ParserAction> enumerator = state.parseTable.Values.GetEnumerator();
enumerator.MoveNext();
int defaultAction = enumerator.Current.ToNum();
if (defaultAction > 0)
return 0; // can't have default shift action
foreach (KeyValuePair<Terminal, ParserAction> transition in state.parseTable)
if (transition.Value.ToNum() != defaultAction)
return 0;
return defaultAction;
}
private void GenerateState(int state_nr, State state)
{
Console.Write(" AddState({0},new State(", state_nr);
int defaultAction = GetDefaultAction(state);
if (defaultAction != 0)
Console.Write(defaultAction);
else
{
Console.Write("new int[]{");
bool first = true;
foreach (KeyValuePair<Terminal, ParserAction> transition in state.parseTable)
{
if (!first)
Console.Write(",");
Console.Write("{0},{1}", transition.Key.num, transition.Value.ToNum());
first = false;
}
Console.Write('}');
}
if (state.nonTerminalTransitions.Count > 0)
{
Console.Write(",new int[]{");
bool first = true;
foreach (Transition transition in state.nonTerminalTransitions.Values)
{
if (!first)
Console.Write(",");
Console.Write("{0},{1}", transition.A.num, transition.next.num);
first = false;
}
Console.Write('}');
}
Console.WriteLine("));");
}
public Shift(State next)
{
this.next = next;
}
private int GetDefaultAction(State state)
{
IEnumerator<ParserAction> enumerator = state.parseTable.Values.GetEnumerator();
enumerator.MoveNext();
int num = enumerator.Current.ToNum();
if (num > 0)
{
return 0;
}
foreach (KeyValuePair<Terminal, ParserAction> current in state.parseTable)
{
if (current.Value.ToNum() != num)
{
return 0;
}
}
return num;
}
public ShiftReduceConflict(Terminal sy, string s1, string s2, State from, State to)
: base(sy, s1, s2)
{
fromState = from; toState = to;
}
private State PathTo(State q, Production prod, int prefix)
{
// q -> prod.rhs[0] ... prod.rhs[prefix] -> ???
for (int i = 0; i < prefix; i++)
{
Symbol s = prod.rhs[i];
if (q.Goto.ContainsKey(s))
q = q.Goto[s];
else
return null;
}
return q;
}
private void GenerateState(State state)
{
int defaultAction = state.GetDefaultAction();
Console.Write(" ");
// default action is always < 0 (reduction)
if (defaultAction == 0 || state.nonTerminalTransitions.Count > 0) {
// actions:
if (defaultAction == 0) {
Console.Write("{0},", state.parseTable.Count);
} else {
Console.Write("0,");
}
// gotos:
Console.Write("{0},", state.nonTerminalTransitions.Count);
}
if (defaultAction == 0) {
Console.Write(" /* actions: */ ");
foreach (KeyValuePair<Terminal, ParserAction> transition in state.parseTable) {
Console.Write("{0},{1},", transition.Key.num, transition.Value.ToNum());
}
} else {
Console.Write(" /* default action: */ ");
Console.Write("{0},", defaultAction);
}
if (state.nonTerminalTransitions.Count > 0) {
Console.Write(" /* gotos: */ ");
foreach (Transition transition in state.nonTerminalTransitions.Values) {
Console.Write("{0},{1},", transition.A.num, transition.next.num);
}
}
Console.WriteLine();
}
private State PathTo(State q, Production prod, int prefix)
{
for (int i = 0; i < prefix; i++)
{
Symbol key = prod.rhs[i];
if (!q.Goto.ContainsKey(key))
{
return null;
}
q = q.Goto[key];
}
return q;
}