public override Result VisitExpr_funccall([NotNull] ExpressionParser.Expr_funccallContext context)
{
if (context.funcname.Text.Equals("SIN", StringComparison.OrdinalIgnoreCase))
{
if (context._args.Count != 1)
{
return(DefaultResult);
}
var(suc, val) = Visit(context._args[0]);
if (!suc)
{
return(DefaultResult);
}
//このサンプルでは浮動小数点型を導入していないので、引数はラジアンではなく角度とし、自動で変換する
return(new Result(true, (int)Math.Sin(DegToRad(val))));
}
switch (context.Start.Type)
{
case ExpressionParser.UINT: return(new Result(true, int.Parse(context.Start.Text)));
default: return(DefaultResult);
}
}
/// <summary>
/// Visit a parse tree produced by the <c>expr_funccall</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_funccall([NotNull] ExpressionParser.Expr_funccallContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by the <c>expr_funccall</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_funccall([NotNull] ExpressionParser.Expr_funccallContext context)
{
}
