public override Result VisitExpr_additive([NotNull] ExpressionParser.Expr_additiveContext context)
{
var(lSuc, lValue) = Visit(context.lhs);
var(rSuc, rValue) = Visit(context.rhs);
if (!(lSuc && rSuc))
{
return(DefaultResult);
}
switch (context.op.Type)
{
case ExpressionParser.PLUS: return(new Result(true, lValue + rValue));
case ExpressionParser.MINUS: return(new Result(true, lValue - rValue));
default: return(DefaultResult);
}
}
/// <summary>
/// Visit a parse tree produced by the <c>expr_additive</c>
/// labeled alternative in <see cref="ExpressionParser.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 VisitExpr_additive([NotNull] ExpressionParser.Expr_additiveContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>expr_additive</c>
/// labeled alternative in <see cref="ExpressionParser.expr"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitExpr_additive([NotNull] ExpressionParser.Expr_additiveContext context)
{
}
