//Evaluate a check into a raw boolean (no value wrapper).
public override object VisitCheck([NotNull] algoParser.CheckContext context)
{
//Switch for the type of check.
if (context.BIN_AND() != null)
{
//Binary AND.
//Evaluate the left and right values.
AlgoValue left = (AlgoValue)VisitCheck(context.check());
AlgoValue right = (AlgoValue)VisitCheckfrag(context.checkfrag());
//Return the comparison result of these two (as AlgoValue).
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.AND(context, left, right),
});
}
else if (context.BIN_OR() != null)
{
//Binary OR.
//Evaluate the left and right values.
AlgoValue left = (AlgoValue)VisitCheck(context.check());
AlgoValue right = (AlgoValue)VisitCheckfrag(context.checkfrag());
//Return an OR on these values.
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = AlgoComparators.OR(context, left, right),
});
}
else if (context.LBRACKET() != null)
{
//Bracketed check.
return((AlgoValue)VisitCheck(context.check()));
}
else if (context.INVERT_SYM() != null)
{
//Boolean invert.
AlgoValue evaled = (AlgoValue)VisitCheck(context.check());
//Get the boolean value for the evaluated value.
bool evaledBool = AlgoComparators.GetBooleanValue(evaled, context);
//Return the inverted bool.
return(new AlgoValue()
{
Type = AlgoValueType.Boolean,
Value = !evaledBool,
});
}
else
{
//Just a checkfrag. Evaluate and return.
return((AlgoValue)VisitCheckfrag(context.checkfrag()));
}
}
/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.check"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitCheck([NotNull] algoParser.CheckContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.check"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitCheck([NotNull] algoParser.CheckContext context)
{
}