C# ILuaState.UpvalueIndex方法代码示例

 private static int CO_AuxWrap( ILuaState lua )
 {
     ILuaState co = lua.ToThread( lua.UpvalueIndex(1) );
     int r = AuxResume( lua, co, lua.GetTop() );
     if( r < 0 )
     {
         if( lua.IsString( -1 ) ) // error object is a string?
         {
             lua.L_Where( 1 ); // add extra info
             lua.Insert( -2 );
             lua.Concat( 2 );
         }
         lua.Error();
     }
     return r;
 }

		private static int GmatchAux( ILuaState lua )
		{
			MatchState ms = new MatchState();
			string src = lua.ToString( lua.UpvalueIndex(1) );
			string pattern = lua.ToString( lua.UpvalueIndex(2) );
			ms.Lua = lua;
			ms.Src = src;
			ms.SrcInit = 0;
			ms.SrcEnd = src.Length;
			ms.Pattern = pattern;
			ms.PatternEnd = pattern.Length;
			for( int s = lua.ToInteger( lua.UpvalueIndex(3) )
			   ; s <= ms.SrcEnd
			   ; s++ )
			{
				ms.Level = 0;
				int e = Match( ms, s, 0 );
				if( e != -1 )
				{
					int newStart = (e == 0) ? e+1: e;
					lua.PushInteger( newStart );
					lua.Replace( lua.UpvalueIndex(3) );
					return PushCaptures(lua, ms, s, e);
				}
			}
			return 0; // not found
		}

		private static void FindLoader( ILuaState lua, string name )
		{
			// will be at index 3
			lua.GetField( lua.UpvalueIndex(1), "searchers" );
			if( ! lua.IsTable(3) )
				lua.L_Error("'package.searchers' must be a table");

			var sb = new StringBuilder();
			// iterator over available searchers to find a loader
			for( int i=1; ; ++i )
			{
				lua.RawGetI( 3, i ); // get a searcher
				if( lua.IsNil( -1 ) ) // no more searchers?
				{
					lua.Pop( 1 ); // remove nil
					lua.PushString( sb.ToString() );
					lua.L_Error( "module '{0}' not found:{1}",
						name, lua.ToString(-1));
					return;
				}

				lua.PushString( name );
				lua.Call( 1, 2 ); // call it
				if( lua.IsFunction(-2) ) // did it find a loader
					return; // module loader found
				else if( lua.IsString(-2) ) // searcher returned error message?
				{
					lua.Pop( 1 ); // return extra return
					sb.Append( lua.ToString(-1) );
				}
				else
					lua.Pop( 2 ); // remove both returns
			}
		}

		private static string FindFile( ILuaState lua,
			string name, string pname, string dirsep )
		{
			lua.GetField( lua.UpvalueIndex(1), pname );
			string path = lua.ToString( -1 );
			if( path == null )
				lua.L_Error( "'package.{0}' must be a string", pname );
			return SearchPath( lua, name, path, ".", dirsep );
		}