public override DynObj VisitArithmaticExpr([NotNull] KittenGrammarParser.ArithmaticExprContext context)
{
var LHS = Visit(context.left);
var RHS = Visit(context.right);
var op = context.op.Text;
if (LHS.t == vType.Number && RHS.t == vType.Number)
{
switch (op)
{
case "+":
return(DNumber(LHS.NumberVal + RHS.NumberVal));
case "-":
return(DNumber(LHS.NumberVal - RHS.NumberVal));
case "*":
return(DNumber(LHS.NumberVal * RHS.NumberVal));
case "/":
return(DNumber(LHS.NumberVal / RHS.NumberVal));
}
}
else if (LHS.t == vType.String && RHS.t == vType.String)
{
if (op == "+")
{
return(DString(LHS.StringVal + RHS.StringVal));
}
}
else
{
ReportError("InvalidTypeError", $"LHS type {LHS.typeName} and RHS type {RHS.typeName} used on operator \"{op}\"", context.start.Line);
}
return(base.VisitArithmaticExpr(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>arithmaticExpr</c>
/// labeled alternative in <see cref="KittenGrammarParser.expr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitArithmaticExpr([NotNull] KittenGrammarParser.ArithmaticExprContext context)
{
}
/// <summary>
/// Visit a parse tree produced by the <c>arithmaticExpr</c>
/// labeled alternative in <see cref="KittenGrammarParser.expr"/>.
/// <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 VisitArithmaticExpr([NotNull] KittenGrammarParser.ArithmaticExprContext context)
{
return(VisitChildren(context));
}
