private bool step()
{
if (currentToken == null)
{
int pos = 0;
if (previousToken != null)
{
pos = previousToken.getPosition() + previousToken.getLexeme().Length;
}
currentToken = new Token(DOLLAR, "$", pos);
}
int x = ((int)stack.Pop());
int a = currentToken.getId();
if (x == EPSILON)
{
return(false);
}
else if (isTerminal(x))
{
if (x == a)
{
if (stack.Count == 0)
{
return(true);
}
else
{
previousToken = currentToken;
currentToken = scanner.nextToken();
return(false);
}
}
else
{
throw new SyntaticError(PARSER_ERROR[x], currentToken.getLinha());
}
}
else if (isNonTerminal(x))
{
if (pushProduction(x, a))
{
return(false);
}
else
{
//Console.WriteLine(currentToken.getLexeme());
throw new SyntaticError(PARSER_ERROR[x], currentToken.getLinha());
}
}
else // isSemanticAction(x)
{
semanticAnalyser.executeAction(x - FIRST_SEMANTIC_ACTION, previousToken);
return(false);
}
}
public void parse(Lexico scanner, Semantico semanticAnalyser)
{
this.scanner = scanner;
this.semanticAnalyser = semanticAnalyser;
stack.Clear();
stack.Push(DOLLAR);
stack.Push(START_SYMBOL);
currentToken = scanner.nextToken();
while (!step());
}
public void parse(Lexico scanner, Semantico semanticAnalyser)
{
this.scanner = scanner;
this.semanticAnalyser = semanticAnalyser;
stack.Clear();
stack.Push(DOLLAR);
stack.Push(START_SYMBOL);
currentToken = scanner.nextToken();
while (!step())
{
;
}
}