DELETE command in VISUAL, generalized Stator Obj

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

@@ -0,0 +1,71 @@
+(function(){
+	var ns = __namespace( "Components.Vim.State" );
+
+	var Stator = function( cur, start )
+	{
+		this.__cursor = cur;
+		this.__startPosition = start == undefined ? cur.aPos : start;
+		this.__startState = this.__saveCur();
+	};
+
+	Stator.prototype.save = function( insertLength, contentUndo )
+	{
+		var cur = this.__cursor;
+		var feeder = cur.feeder;
+		var startPos = this.__startPosition;
+
+		if( insertLength < 0 )
+		{
+			startPos += insertLength;
+			insertLength = 0;
+		}
+
+		var sSt = this.__startState;
+		var eSt = this.__saveCur();
+
+		var st = sSt;
+		// Calling this repeatedly will swap between UNDO / REDO state
+		return function() {
+			var contentRedo = feeder.content.substr( startPos, insertLength );
+			feeder.content =
+				feeder.content.substring( 0, startPos )
+				+ contentUndo
+				+ feeder.content.substring( startPos + insertLength );
+			insertLength = contentUndo.length;
+			contentUndo = contentRedo;
+
+			cur.PStart = st.p;
+			cur.PEnd = st.p + 1;
+			cur.X = st.x;
+			cur.Y = st.y;
+			feeder.panX = st.px;
+			feeder.panY = st.py;
+
+			feeder.pan();
+
+			st = ( st == sSt ) ? eSt : sSt;
+		};
+	};
+
+	Stator.prototype.__saveCur = function()
+	{
+		var c = this.__cursor;
+		var obj = {
+			p: c.PStart
+			, x: c.X
+			, y: c.Y
+			, px: c.feeder.panX
+			, py: c.feeder.panY
+		};
+
+		if( 0 < obj.x )
+		{
+			obj.p -= 1;
+			obj.x -= 1;
+		}
+
+		return obj;
+	};
+
+	ns[ NS_EXPORT ]( EX_CLASS, "Stator", Stator );
+})();