/// <summary>
/// visiti a constraint expression
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override Expression <Func <T, bool> > VisitConstraint(QueryParser.ConstraintContext context)
{
if (context.@group() != null)
{
return(context.@group().Accept(this));
}
return(context.comparison() != null?context.comparison().Accept(this) : null);
}
/// <summary>
/// Visit a parse tree produced by <see cref="QueryParser.constraint"/>.
/// <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 VisitConstraint([NotNull] QueryParser.ConstraintContext context)
{
return(VisitChildren(context));
}
/// <summary>
/// Exit a parse tree produced by <see cref="QueryParser.constraint"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitConstraint([NotNull] QueryParser.ConstraintContext context)
{
}
