//javascript: 
var expSyntaxArray = [];

Element.prototype.getElementWidth = function() {
    if (typeof this.clip !== "undefined") {
	return this.clip.width;
    } else {
	if (this.style.pixelWidth) {
	    return this.style.pixelWidth;
	} else {
	    return this.offsetWidth;
	}
    }
};

Element.prototype.getElementHeight = function() {
    if (typeof this.clip !== "undefined") {
	return this.clip.height;
    } else {
	if (this.style.pixelHeight) {
	    return this.style.pixelHeight;
	} else {
	    return this.offsetHeight;
	}
    }
};

function getElementWidth(elem)
{
    if (typeof elem.clip !== "undefined") {
	return elem.clip.width;
    } else {
	if (elem.style && elem.style.pixelWidth) {
	    return elem.style.pixelWidth;
	} else {
	    return elem.offsetWidth;
	}
    }
}

function getElementHeight(elem)
{
    if (typeof elem.clip !== "undefined") {
	return elem.clip.height;
    } else {
	if (elem.style && elem.style.pixelHeight) {
	    return elem.style.pixelHeight;
	} else {
	    return elem.offsetHeight;
	}
    }
}

function hyphenToInitialCapReplacer(str, p1, offset, s)  
{  
    return p1.toUpperCase();
}  

function getStyle(node,style_prop)
{
    var prop_val;
    if (node.currentStyle) {
	/* IE */
	style_prop = strCssRule.replace(/\-(\w)/g, hyphenToInitialCapReplacer);
	prop_val = node.currentStyle[style_prop];
    }
    else if (window.getComputedStyle) {
	/* Firefox */
	var computed_style = document.defaultView.getComputedStyle(node,null)
	prop_val = computed_style.getPropertyValue(style_prop);
    }
    else {
	/* try for inline value */
	prop_val = el.style[style_prop];
    }

    return prop_val;

}

function getElementPosition(elem) 
{
    var origElem = elem;

    var xl_ = 0;
    var yt_ = 0;

    while(elem && !isNaN(elem.offsetLeft) && !isNaN(elem.offsetTop)) {
        xl_ += elem.offsetLeft - elem.scrollLeft;
        yt_ += elem.offsetTop - elem.scrollTop;
        elem = elem.offsetParent;
    }

    var xr_ = xl_ + getElementWidth(origElem);
    var yb_ = yt_ + getElementHeight(origElem);

    return { xl: xl_, yt: yt_, xr: xr_, yb: yb_ };
}


function htmlToExpeditee(node) 
{
    var nodePos = getElementPosition(node); 
    var pxl = nodePos.xl;
    var pyt = nodePos.yt;
    var pxr = nodePos.xr;
    var pyb = nodePos.yb;

    return htmlToExpediteeRec(node, pxl,pyt, pxl,pyt,pxr,pyb, 0);
}


function htmlToExpediteeRec(node,baseX,baseY, pxl,pyt,pxr,pyb, depth) 
{
    depth = (depth) ? depth : 0;

    var jsonNode = null;

    if (node.nodeType == 3) { /* text node */
        var text = node.nodeValue;

        if (text.match(/\S/)) {
    	    jsonNode = {};

	    jsonNode.type = "text";
	    jsonNode.text = node.nodeValue;

	    jsonNode.xl = pxl;
	    jsonNode.yt = pyt;
	    jsonNode.xr = pxr;
	    jsonNode.yb = pyb;

	    var parent = node.parentNode;
	    if (parent != null) {
		var data = parent.attributes["data"];

                if (data != null) {
		  jsonNode.data = data.value;
	        }
	    }

	}
    }
    else if (node.nodeType == 1) { /* element */

	/* need to handle: img, a, li */
        /* need to dig out: text size, l/r/justified, font-face, type, colour */

	if (getStyle(node,"visibility").match("hidden")
	    || getStyle(node,"display").match("none")) {

	    return null;
	}

        var elemName = node.nodeName.toLowerCase();

	if (!elemName.match(/script/)) {
   
	    var nodePos = getElementPosition(node); 
	    var xl = nodePos.xl;
	    var xr = nodePos.xr;
	    var yt = nodePos.yt;
	    var yb = nodePos.yb;

            jsonNode = {};
	    jsonNode.type = "rect";
    	    jsonNode.elem = node.nodeName;

	    var rect = { "xl":xl, "yt":yt, "xr":xr, "yb":yb };
	    jsonNode.rect = rect;
	
	    if (elemName.match("img")) {
		jsonNode.img = node.src;
	    }

	    var style = {};

	    style["font-family"]      = getStyle(node,"font-family");
	    style["font-size"]        = getStyle(node,"font-size");
	    style["background-color"] = getStyle(node,"background-color");

	    // console.log("background color = " + style["background-color"]);

	    // console.log("font size = " + style["font-size"]);
 
	    jsonNode.style = style

            var jsonChildNodes = [];

	    var cnode = node.firstChild; 
	    while (cnode != null) {

	        var jsonChildNode 
		    = htmlToExpediteeRec(cnode,baseX,baseY,xl,yt,xr,yb,depth+1);

	        if (jsonChildNode != null) {
		    jsonChildNodes.push(jsonChildNode);  
	        }
		
		cnode = cnode.nextSibling;
	    }

	    jsonNode.childNodes = jsonChildNodes;
	}

    }
    /* currently do nothing for the other node types */

    return jsonNode;
}


//var body = document.body;
//alert(traverseDOM(body));