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