/// <summary>
/// Visit a parse tree produced by <see cref="Z80EvalParser.relExpr"/>.
/// <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 VisitRelExpr(Z80EvalParser.RelExprContext context)
{
if (IsInvalidContext(context))
{
return(null);
}
var expr = (ExpressionNode)VisitShiftExpr(context.shiftExpr()[0]);
var opIndex = 1;
for (var i = 1; i < context.shiftExpr().Length; i++)
{
var rightExpr = VisitShiftExpr(context.shiftExpr()[i]);
var opToken = context.GetTokenText(opIndex);
var relExpr = opToken == "<"
? new LessThanOperationNode()
: (opToken == "<="
? new LessThanOrEqualOperationNode()
: (opToken == ">"
? new GreaterThanOperationNode()
: new GreaterThanOrEqualOperationNode() as BinaryOperationNode));
relExpr.LeftOperand = expr;
relExpr.RightOperand = (ExpressionNode)rightExpr;
expr = relExpr;
opIndex += 2;
}
return(expr);
}
/// <summary>
/// Visit a parse tree produced by <see cref="Z80EvalParser.relExpr"/>.
/// <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 VisitRelExpr([NotNull] Z80EvalParser.RelExprContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="Z80EvalParser.relExpr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitRelExpr([NotNull] Z80EvalParser.RelExprContext context)
{
}