private Token Symbol()
{
int startPosition = GetCurrentPositionInInput();
StringBuilder sbuf = new StringBuilder(); // StringBuffer en Java lo hemos modernizado a StringBuilder
while (PropositionSymbol.IsPropositionSymbolIdentifierPart(LookAhead(1)))
{
sbuf.Append(LookAhead(1));
Consume();
}
string symbol = sbuf.ToString();
if (PropositionSymbol.IsAlwaysTrueSymbol(symbol))
{
return(new Token(LogicTokenTypes.TRUE, PropositionSymbol.TRUE_SYMBOL, startPosition));
}
else if (PropositionSymbol.IsAlwaysFalseSymbol(symbol))
{
return(new Token(LogicTokenTypes.FALSE, PropositionSymbol.FALSE_SYMBOL, startPosition));
}
else if (PropositionSymbol.IsPropositionSymbol(symbol))
{
return(new Token(LogicTokenTypes.SYMBOL, sbuf.ToString(), startPosition));
}
throw new LexerException("Lexing error on symbol " + symbol + " at position " + GetCurrentPositionInInput(), GetCurrentPositionInInput());
}
// Compara este símbolo de proposición con otro y dice si son iguales
public bool Equals(PropositionSymbol sym)
{
if (sym == null)
{
return(false);
}
if (this == sym)
{
return(true);
}
return(symbol.Equals(sym.symbol)); // No equivocarse con esto que había: sym.Equals(sym.symbol)
}
public void Test_isAlwaysTrueSymbol()
{
Assert.IsTrue(PropositionSymbol.IsAlwaysTrueSymbol("True"));
Assert.IsTrue(PropositionSymbol.IsAlwaysTrueSymbol("tRue"));
Assert.IsTrue(PropositionSymbol.IsAlwaysTrueSymbol("trUe"));
Assert.IsTrue(PropositionSymbol.IsAlwaysTrueSymbol("truE"));
Assert.IsTrue(PropositionSymbol.IsAlwaysTrueSymbol("TRUE"));
Assert.IsTrue(PropositionSymbol.IsAlwaysTrueSymbol("true"));
//
Assert.IsFalse(PropositionSymbol.IsAlwaysTrueSymbol("Tru3"));
Assert.IsFalse(PropositionSymbol.IsAlwaysTrueSymbol("True "));
Assert.IsFalse(PropositionSymbol.IsAlwaysTrueSymbol(" True"));
}
public void Test_isAlwaysFalseSymbol()
{
Assert.IsTrue(PropositionSymbol.IsAlwaysFalseSymbol("False"));
Assert.IsTrue(PropositionSymbol.IsAlwaysFalseSymbol("fAlse"));
Assert.IsTrue(PropositionSymbol.IsAlwaysFalseSymbol("faLse"));
Assert.IsTrue(PropositionSymbol.IsAlwaysFalseSymbol("falSe"));
Assert.IsTrue(PropositionSymbol.IsAlwaysFalseSymbol("falsE"));
Assert.IsTrue(PropositionSymbol.IsAlwaysFalseSymbol("FALSE"));
Assert.IsTrue(PropositionSymbol.IsAlwaysFalseSymbol("false"));
//
Assert.IsFalse(PropositionSymbol.IsAlwaysFalseSymbol("Fals3"));
Assert.IsFalse(PropositionSymbol.IsAlwaysFalseSymbol("False "));
Assert.IsFalse(PropositionSymbol.IsAlwaysFalseSymbol(" False"));
}
public void Test_isPropositionSymbolDoesNotContainConnectiveChars()
{
// '~', '&', '|', '=', '<', '>'
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("~"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("&"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("|"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("="));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("<"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol(">"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A~"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A&"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A|"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A="));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A<"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A>"));
}
public void Test_isPropositionSymbol()
{
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("True"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("False"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("A"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("A1"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("A_1"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("a"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("a1"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("A_1"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("_"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("_1"));
Assert.IsTrue(PropositionSymbol.IsPropositionSymbol("_1_2"));
// Las comas no se permiten (sólo caracteres que puedan estar en identificadores legales de Java... ahora C#)
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A1,2"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol(" A"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A "));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("A B"));
// En Java sí se permiten identificadores con el símbolo del dólar... pero en C# no
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("$"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("$1"));
Assert.IsFalse(PropositionSymbol.IsPropositionSymbol("$1_1"));
}
private bool SymbolDetected(char leadingChar)
{
return(PropositionSymbol.IsPropositionSymbolIdentifierStart(leadingChar));
}