public override object VisitAssignment([NotNull] CalculatorParser.AssignmentContext context)
{
object oldValue = context.expression()[0].Accept(this);
var varName = m_iterName;
var stack = m_iterStack;
object newValue = context.expression()[1].Accept(this);
var op = context.children[1] as ITerminalNode;
switch (op.Symbol.Type)
{
case CalculatorParser.AddAss:
newValue = BinaryOperation(oldValue, newValue, CalculatorParser.Plus);
break;
case CalculatorParser.MinusAss:
newValue = BinaryOperation(oldValue, newValue, CalculatorParser.Minus);
break;
case CalculatorParser.MultiplyAss:
newValue = BinaryOperation(oldValue, newValue, CalculatorParser.Multiply);
break;
case CalculatorParser.DivideAss:
newValue = BinaryOperation(oldValue, newValue, CalculatorParser.Divide);
break;
}
if (stack is Array array)
{
array[Convert.ToInt32(varName)] = newValue;
}
else
{
stack.Set(varName, newValue);
}
m_iterStack = m_stack;
m_iterName = "";
return(newValue);
}
/// <summary>
/// Visit a parse tree produced by <see cref="CalculatorParser.assignment"/>.
/// <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 VisitAssignment([NotNull] CalculatorParser.AssignmentContext context)
{
return(VisitChildren(context));
}
public override void ExitAssignment([NotNull] CalculatorParser.AssignmentContext context)
{
sym.Add(context.ID().GetText(), stack.Pop());
//base.ExitAssignment(context);
}
