/// <summary>
/// Creates a new LALR parser.
/// </summary>
/// <param name="tokenizer">A tokenizer.</param>
/// <param name="states">The LALR states.</param>
/// <param name="startState">The starting state.</param>
/// <param name="symbols"></param>
public LALRParser(IStringTokenizer tokenizer, StateCollection states, State startState, SymbolCollection symbols)
{
this.tokenizer = tokenizer;
this.states = states;
this.startState = startState;
this.symbols = symbols;
storeTokens = StoreTokensMode.NoUserObject;
}
private void Reset()
{
stream = null;
structure = null;
content = null;
dfaStates = null;
parserStates = null;
symbols = null;
rules = null;
}
/// <summary>
/// Creates a new LALR parser.
/// </summary>
/// <param name="tokenizer">A tokenizer.</param>
/// <param name="states">The LALR states.</param>
/// <param name="startState">The starting state.</param>
public LALRParser(IStringTokenizer tokenizer,
StateCollection states,
State startState,
SymbolCollection symbols)
{
this.tokenizer = tokenizer;
this.states = states;
this.startState = startState;
this.symbols = symbols;
storeTokens = StoreTokensMode.NoUserObject;
}
private SymbolCollection CreateSymbols(CGTContent content)
{
SymbolCollection symbols = new SymbolCollection();
foreach (SymbolRecord symbolRecord in content.SymbolTable)
{
Symbol symbol = SymbolFactory.CreateSymbol(symbolRecord);
symbols.Add(symbol);
}
return(symbols);
}
private SymbolCollection FindExpectedTokens()
{
SymbolCollection symbols = new SymbolCollection();
State state = stateStack.Peek();
foreach (Action action in state.Actions)
{
if ((action is ShiftAction) || (action is ReduceAction) || (action is AcceptAction))
{
symbols.Add(action.symbol);
}
}
return(symbols);
}
private SymbolCollection FindExpectedTokens()
{
SymbolCollection symbols = new SymbolCollection();
State state = stateStack.Peek();
foreach(Action action in state.Actions)
{
if ((action is ShiftAction) || (action is ReduceAction)
|| (action is AcceptAction))
{
symbols.Add(action.symbol);
}
}
return symbols;
}
public ParseErrorEventArgs(TerminalToken unexpectedToken, SymbolCollection expectedTokens)
{
this.unexpectedToken = unexpectedToken;
this.expectedTokens = expectedTokens;
contin = ContinueMode.Stop;
nextToken = null;
}
private SymbolCollection CreateSymbols(CGTContent content)
{
SymbolCollection symbols = new SymbolCollection();
foreach (SymbolRecord symbolRecord in content.SymbolTable)
{
Symbol symbol = SymbolFactory.CreateSymbol(symbolRecord);
symbols.Add(symbol);
}
return symbols;
}
private DFA.StateCollection CreateDFAStates(CGTContent content)
{
symbols = CreateSymbols(content);
DFA.StateCollection states = new DFA.StateCollection();
foreach (DFAStateRecord stateRecord in content.DFAStateTable)
{
DFA.State state;
if (stateRecord.AcceptState)
{
Symbol symbol = symbols[stateRecord.AcceptIndex];
state = new DFA.EndState(stateRecord.Index,(SymbolTerminal)symbol);
//todo: type checking (exception?)
}
else
{
state = new DFA.State(stateRecord.Index);
}
states.Add(state);
}
foreach (DFAStateRecord stateRecord in content.DFAStateTable)
{
foreach (EdgeSubRecord edgeRecord in stateRecord.EdgeSubRecords)
{
DFA.State source = states[stateRecord.Index];
DFA.State target = states[edgeRecord.TargetIndex];
CharacterSetRecord charsetRec = content.CharacterSetTable[edgeRecord.CharacterSetIndex];
DFA.Transition transition = new DFA.Transition(target,charsetRec.Characters);
source.Transitions.Add(transition);
}
}
return states;
}
public ParseErrorEventArgs(TerminalToken unexpectedToken,
SymbolCollection expectedTokens)
{
this.unexpectedToken = unexpectedToken;
this.expectedTokens = expectedTokens;
this.contin = false;
this.nextToken = null;
}
