Some placeholder commands in VISUAL

botanjs/src/Components/Vim/State/Registers.js

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+(function(){
+/*  From Vim, :help registers
+	There are ten types of registers:
+	1. The unnamed register ""
+	2. 10 numbered registers "0 to "9
+	3. The small delete register "-
+	4. 26 named registers "a to "z or "A to "Z
+	5. three read-only registers ":, "., "%
+	6. alternate buffer register "#
+	7. the expression register "=
+	8. The selection and drop registers "*, "+ and "~ 
+	9. The black hole register "_
+	10. Last search pattern register "/
+	i.e. 0123456789-abcdefghijklmnopqrstuvwxyz:.%$=*+~_/
+*/
+	var ns = __namespace( "Components.Vim.State" );
+
+	var Registers = function()
+	{
+		this.__registers = {};
+	};
+
+	Registers.prototype.unnamed = function( str )
+	{
+		this.__registers[ "\"" ] = str;
+	};
+
+	Registers.prototype.yank = function( str )
+	{
+		this.unnamed( str );
+		this.__registers[ 0 ] = str;
+	};
+
+	Registers.prototype.change = function( str )
+	{
+		this.unnamed( str );
+		var r = this.__registers;
+		for( var i = 9; 1 < i; i -- )
+		{
+			if( r[ i - 1 ] != undefined )
+			{
+				r[ i ] = r[ i - 1 ];
+			}
+		}
+
+		r[ 1 ] = str;
+	};
+
+	ns[ NS_EXPORT ]( EX_CLASS, "Registers", Registers );
+})();