public override Maybe<Result> VisitNeg_expr(QueryParser.Neg_exprContext context)
{
if (context.SUB() != null)
return VisitNeg_expr(context.neg_expr()).Bind(r => r.Negate().Just());
return new TermExprVisitor(_zmi, _env).Visit(context.term_expr());
}
/// <summary>
/// Visit a parse tree produced by <see cref="QueryParser.neg_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 VisitNeg_expr([NotNull] QueryParser.Neg_exprContext context)
{
return(VisitChildren(context));
}