public override object VisitIncrementExpr([NotNull] CalculatorParser.IncrementExprContext context) { var varName = context.Id().Accept(this) as string; object oldValue = GetValue(context.Id()); var newValue = (int)oldValue + 1; var node = context.children[0] as ITerminalNode; m_stack.Set(varName, newValue); // Pre-increment if (node.Symbol.Type == CalculatorParser.Increment) { return(GetValue(context.Id())); } // Post-increment else { return(oldValue); } }
/// <summary> /// Visit a parse tree produced by <see cref="CalculatorParser.incrementExpr"/>. /// <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 VisitIncrementExpr([NotNull] CalculatorParser.IncrementExprContext context) { return(VisitChildren(context)); }