private string GetSyntaxErrorMessage()
{
StringBuilder errorMsg = new StringBuilder();
errorMsg.AppendFormat("syntax error, unexpected {0}", Parser.TerminalToString(_nextToken));
if (_currentState.Actions.Count < 7)
{
bool first = true;
foreach (int terminal in _currentState.Actions.Keys)
{
if (first)
{
errorMsg.Append(", expecting ");
}
else
{
errorMsg.Append(", or ");
}
errorMsg.Append(Parser.TerminalToString(terminal));
first = false;
}
}
return(errorMsg.ToString());
}
public void DumpTables(TextWriter /*!*/ output)
{
#if DEBUG
Dictionary <int, bool> terminals = new Dictionary <int, bool>();
Dictionary <int, bool> nonterminals = new Dictionary <int, bool>();
int termCount = -1;
int ntermCount = -1;
for (int q = 0; q < _states.Length; q++)
{
State s = _states[q];
if (s.Actions != null)
{
foreach (int t in s.Actions.Keys)
{
if (t > termCount)
{
termCount = t;
}
terminals[t] = true;
}
}
if (s.GotoStates != null)
{
foreach (int t in s.GotoStates.Keys)
{
if (t > ntermCount)
{
ntermCount = t;
}
nonterminals[t] = true;
}
}
}
output.WriteLine("States x (Terms + NonTerms) = {0} x ({1} + {2})", _states.Length, termCount, ntermCount);
output.Write("State,");
output.Write("Default,");
for (int t = 0; t < termCount; t++)
{
if (terminals.ContainsKey(t))
{
output.Write(Parser.TerminalToString(t));
output.Write(",");
}
}
for (int t = 0; t < ntermCount; t++)
{
if (nonterminals.ContainsKey(t))
{
output.Write(t); // TODO
output.Write(",");
}
}
for (int q = 0; q < _states.Length; q++)
{
State s = _states[q];
output.Write(q);
output.Write(",");
if (s.Actions == null)
{
output.Write(ActionToString(s.DefaultAction));
}
output.Write(",");
for (int t = 0; t < termCount; t++)
{
if (terminals.ContainsKey(t))
{
int action;
if (s.Actions != null)
{
s.Actions.TryGetValue(t, out action);
output.Write(ActionToString(action));
}
output.Write(",");
}
}
for (int t = 0; t < ntermCount; t++)
{
if (nonterminals.ContainsKey(t))
{
if (s.GotoStates != null)
{
int state;
if (s.GotoStates.TryGetValue(t, out state))
{
output.Write(state);
}
}
output.Write(",");
}
}
output.WriteLine();
}
#endif
}
// < 0 -> non-terminal
// > 0 -> terminal
internal string SymbolToString(int symbol)
{
return((symbol < 0) ? NonTerminalToString(-symbol) : Parser.TerminalToString(symbol));
}
