javascript: photoshop get all text

gistfile1

/*
	get all texts from text layer in photoshop.
*/
function get_all_text (document) {
	var doc = document || app.activeDocument;	
	if(doc != null || doc != undefined){  	
		var str = "";
		var layer = null;
		var objArray = [];
		var text = "";
		for(i = 0, len = doc.artLayers.length; i < len; i++){  			
			layer = doc.artLayers[i];							
			if(layer.kind == LayerKind.TEXT){
				text = layer.textItem.contents.replace(/ {2,}/g,' ');				
				if(text !== "") {
					objArray.push({content: text, x1: layer.bounds[0].value, y1:layer.bounds[1].value, 
								x2:layer.bounds[2].value, y2:layer.bounds[3].value});				
				}
			};
		};		
		objArray.sort( function(a,b) {
			if(a["y1"] < b["y1"]) return -1;
			if(a["y1"] > b["y1"]) return 1;
			return 0;			
		});
		for(var i = 0, len = objArray.length; i < len; i++){
			str += (objArray[i].content + 
						";;" + objArray[i].x1 + ";;" + objArray[i].y1 + ";;" + 
						"" + objArray[i].x2 + ";;" + objArray[i].y2 +
						";;;");
		}		
		return str;
	}
};