/*
 * Copyright(c) 2011
 *     OJC Technologies
 *     all rights reserved
 * @author: Jake Smith
 */


/*
 * Constitues the actual element(s) in the page and includes
 * a number of helpful functions for managing its data
 * 
 * s = new SubCursor();
 * s.init(element_type_string, id_string);
 * ...operations with new object...
 */
function SubCursor() {
    this.element = null;
    this.contents = null;
    
    this.init = function(elemType, idString) {
        this.element = document.createElement(elemType);
        this.element.setAttribute("id", idString);
    }
    
    this.push = function(textNode) {
        if (this.contents != null) {
            throw new Error("should not put a textnode into cursor\n"
                + "cursor element already has contents...\n"
                + "pop contents first");
        }
        this.contents = textNode;
        this.element.appendChild(this.contents);
    }
    
    this.pop = function() {
        var textNode;
        if (this.contents == null) {
            return null;
        }
        textNode = this.contents;
        this.element.removeChild(this.contents);
        this.contents = null;
        return textNode;
    }
}