public override object VisitDecrementExpr([NotNull] CalculatorParser.DecrementExprContext 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-decrement if (node.Symbol.Type == CalculatorParser.Decrement) { return(GetValue(context.Id())); } // Post-decrement else { return(oldValue); } }
/// <summary> /// Visit a parse tree produced by <see cref="CalculatorParser.decrementExpr"/>. /// <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 VisitDecrementExpr([NotNull] CalculatorParser.DecrementExprContext context) { return(VisitChildren(context)); }