using System;
using System.Reflection;
using System.Collections;
using System.Collections.Generic;
using System.Text;
namespace Server.Commands.Generic
{
public sealed class SortExtension : BaseExtension
{
public static ExtensionInfo ExtInfo = new ExtensionInfo( 40, "Order", -1, delegate() { return new SortExtension(); } );
public static void Initialize()
{
ExtensionInfo.Register( ExtInfo );
}
public override ExtensionInfo Info
{
get { return ExtInfo; }
}
private List<OrderInfo> m_Orders;
private IComparer m_Comparer;
public SortExtension()
{
m_Orders = new List<OrderInfo>();
}
public override void Optimize( Mobile from, Type baseType, ref AssemblyEmitter assembly )
{
if ( baseType == null )
throw new Exception( "The ordering extension may only be used in combination with an object conditional." );
foreach ( OrderInfo order in m_Orders )
{
order.Property.BindTo( baseType, PropertyAccess.Read );
order.Property.CheckAccess( from );
}
if ( assembly == null )
assembly = new AssemblyEmitter( "__dynamic", false );
m_Comparer = SortCompiler.Compile( assembly, baseType, m_Orders.ToArray() );
}
public override void Parse( Mobile from, string[] arguments, int offset, int size )
{
if ( size < 1 )
throw new Exception( "Invalid ordering syntax." );
if ( Insensitive.Equals( arguments[offset], "by" ) )
{
++offset;
--size;
if ( size < 1 )
throw new Exception( "Invalid ordering syntax." );
}
int end = offset + size;
while ( offset < end )
{
string binding = arguments[offset++];
bool isAscending = true;
if ( offset < end )
{
string next = arguments[offset];
switch ( next.ToLower() )
{
case "+":
case "up":
case "asc":
case "ascending":
isAscending = true;
++offset;
break;
case "-":
case "down":
case "desc":
case "descending":
isAscending = false;
++offset;
break;
}
}
Property property = new Property( binding );
m_Orders.Add( new OrderInfo( property, isAscending ) );
}
}
public override void Filter( ArrayList list )
{
if ( m_Comparer == null )
throw new InvalidOperationException( "The extension must first be optimized." );
list.Sort( m_Comparer );
}
}
}
