source: gs3-extensions/html-to-expeditee/trunk/src/src/js/html-to-expeditee.js

//javascript: 
var expSyntaxArray = [];

var font_family;
var font_size;
var font_color;
var font_weight;
var font_style;

var compute_font = false;
var compute_width = false;

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,compFont,compWidth) 
{
    compute_font = compFont;
    compute_width = compWidth;
    
    var nodePos = getElementPosition(node);
    var parentStyle = node.getAttribute('style');
    
    //Use these as default values if font info can't be found for text items.
    //and only if the user wants the font computed (otherwise use Expeditee defaults).
    if(compute_font){
        font_family = getStyle(node,'font-family');
        font_size = getStyle(node,'font-size');
        font_color = getStyle(node,'color');
    }
    
    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) {
        
            //set a frame link attribute
            var link = parent.attributes["link"];
            
            if(link !== null && link !== undefined){
                console.log(link.value);
                jsonNode.link = link.value;
            }
        
            if(compute_font){
                //obtain font info for text nodes from their parent nodes.
                var new_font_family = getStyle(parent,"font-family");
                var new_font_size = getStyle(parent,"font-size");
                var new_font_color = getStyle(parent,"color");
            
                var new_font_weight = getStyle(parent,"font-weight");
                var new_font_style = getStyle(parent,"font-style");
                        
                if(new_font_family !== undefined && new_font_family !== null)
                    font_family = new_font_family;
            
                if(new_font_size !== undefined && new_font_size !== null)
                    font_size = new_font_size;
            
                if(new_font_color !== undefined && new_font_color !== null)
                    font_color = new_font_color;
                
                //TODO: if parent node is a <b> element, then set style["font-weight"] to be "bold".
                if(new_font_weight !== undefined && new_font_weight !== null)
                    font_weight = new_font_weight;
                
                //TODO: if parent node is an <i> element, then set style["font-style"] to be "italic".
                if(new_font_style !== undefined && new_font_style !== null)
                    font_style = new_font_style;
            
                var style = {}; 
                style["font-family"]      = font_family;
                style["font-size"]        = font_size;
                style["color"]            = font_color;
                style["font-weight"]      = font_weight;
                style["font-style"]       = font_style;
            
                jsonNode.style = style;
        }
        
        if(compute_width){
            var parentPos = getElementPosition(parent);
            var parentWidth = parentPos.xr - parentPos.xl;

            jsonNode.width = parentWidth;
        }
        
        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;
        
        if(node.getAttribute("rect") !== undefined){
            
            /**This is to ensure rectangles aren't drawn around "non-rectangular" items such
            as text and empty elements such as <br/>**/
            if(node.getAttribute("rect") === "norect"){
                jsonNode.type = "norect";
            }
        }

        var rect = { "xl":xl, "yt":yt, "xr":xr, "yb":yb };
        jsonNode.rect = rect;
    
        //TODO: Set link attribute for images.
        if (elemName.match("img")) {
            
            var getLink = node.getAttribute("link");
            if(getLink !== null && getLink !== undefined){
                jsonNode.link = getLink;
            }
            
            jsonNode.img = node.src;
            
            
        }

        var style = {};
    
        style["background-color"] = getStyle(node,"background-color");
        
        jsonNode.style = style;

        var attr = node.attributes["attr"];
        
        if (attr != null) {
            jsonNode.attr = attr.value;
        }
        
        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));