/// <summary>
/// Visit a parse tree produced by <see cref="Z80EvalParser.unaryExpr"/>.
/// <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 override object VisitUnaryExpr(Z80EvalParser.UnaryExprContext context)
{
if (IsInvalidContext(context))
{
return(null);
}
if (context.unaryExpr() != null)
{
var unaryExpr = (ExpressionNode)VisitUnaryExpr(context.unaryExpr());
if (unaryExpr == null)
{
return(null);
}
var op = context.GetChild(0).GetText();
switch (op)
{
case "+":
return(new UnaryPlusNode()
{
Operand = unaryExpr
});
case "-":
return(new UnaryMinusNode()
{
Operand = unaryExpr
});
case "~":
return(new UnaryBitwiseNotNode()
{
Operand = unaryExpr
});
case "!":
return(new UnaryLogicalNotNode()
{
Operand = unaryExpr
});
}
}
if (context.literalExpr() != null)
{
return(VisitLiteralExpr(context.literalExpr()));
}
if (context.z80Spec() != null)
{
return(VisitZ80Spec(context.z80Spec()));
}
return(context.symbolExpr() != null
? VisitSymbolExpr(context.symbolExpr())
: VisitExpr(context.GetChild(1) as Z80EvalParser.ExprContext));
}
/// <summary>
/// Visit a parse tree produced by <see cref="Z80EvalParser.unaryExpr"/>.
/// <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 VisitUnaryExpr([NotNull] Z80EvalParser.UnaryExprContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="Z80EvalParser.unaryExpr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitUnaryExpr([NotNull] Z80EvalParser.UnaryExprContext context)
{
}
