/ajax/simile-ajax-api.js

/*==================================================

 *  Simile Ajax API

 *==================================================

 */



if (typeof SimileAjax == "undefined") {

    var isCompiled = ("SimileAjax_isCompiled" in window) && window.SimileAjax_isCompiled;



    var SimileAjax = {

        loaded:                 false,

        loadingScriptsCount:    0,

        error:                  null,

        params:                 { bundle:"true" }

    };

    

    SimileAjax.Platform = new Object();

        /*

            HACK: We need these 2 things here because we cannot simply append

            a <script> element containing code that accesses SimileAjax.Platform

            to initialize it because IE executes that <script> code first

            before it loads ajax.js and platform.js.

        */

        

    var getHead = function(doc) {

        return doc.getElementsByTagName("head")[0];

    };

    

    SimileAjax.findScript = function(doc, substring) {

	var scripts=doc.documentElement.getElementsByTagName("script");

	for (s=0; s<scripts.length;s++) {

            var url = scripts[s].src;

            var i = url.indexOf(substring);

            if (i >= 0) {

                return url;

            }

	}



        var heads = doc.documentElement.getElementsByTagName("head");

        for (var h = 0; h < heads.length; h++) {

            var node = heads[h].firstChild;

            while (node != null) {

                if (node.nodeType == 1 && node.tagName.toLowerCase() == "script") {

                    var url = node.src;

                    var i = url.indexOf(substring);

                    if (i >= 0) {

                        return url;

                    }

                }

                node = node.nextSibling;

            }

        }

        return null;

    };



    SimileAjax.includeJavascriptFile = function(doc, url, onerror, charset, callback) {

        onerror = onerror || "";

        if (doc.body == null) {

            try {

                var q = "'" + onerror.replace( /'/g, '&apos' ) + "'"; // "

                doc.write("<script src='" + url + "' onerror="+ q +

                          (charset ? " charset='"+ charset +"'" : "") +

                          " type='text/javascript'>"+ onerror + "</script>");

                return;

            } catch (e) {

                // fall through

            }

        }



	var calledBack = false;

	var callbackOnce = function() {

	    if (callback && !calledBack) {

		calledBack=true;

		callback();

	    }

	}

        var script = doc.createElement("script");

        if (onerror) {

            try { script.innerHTML = onerror; } catch(e) {};

            script.onerror = function () {onerror(); callbackOnce()};

        }

	else {

	    script.onerror = callbackOnce;

	}

        if (charset) {

            script.setAttribute("charset", charset);

        }

        script.type = "text/javascript";

        script.language = "JavaScript";

        script.src = url;

	if (callback) 

	    script.onload = script.onreadystatechange = function() {

		if (!this.readyState || this.readyState == "loaded" || 

		    this.readyState == "complete") 

		    callbackOnce();

	    }       

        return getHead(doc).appendChild(script);

    };



    function includeJavascriptList(doc, urlPrefix, filenames, included, index, callback) {

        if (!included[index]) { // avoid duplicate callback

            included[index] = true;

            if (index<filenames.length) { 

		var nextCall=function(){

		    includeJavascriptList(doc, urlPrefix, filenames, 

					  included, index+1, callback);

		}

                SimileAjax.

		includeJavascriptFile(doc, 

				      urlPrefix + filenames[index], null, null, 

				      nextCall);

	    }

            else if (callback != null) callback();

        }

    }

    

    SimileAjax.includeJavascriptFiles = function(doc, urlPrefix, filenames) {

	if (doc.body == null) {

            for (var i = 0; i < filenames.length; i++) {

                SimileAjax.includeJavascriptFile(doc, urlPrefix + filenames[i]);

            }

            SimileAjax.loadingScriptsCount += filenames.length;

            SimileAjax.includeJavascriptFile(doc, SimileAjax.urlPrefix + "scripts/signal.js?" + filenames.length);

        }

        else {

            var included = new Array();

            for (var i = 0; i < filenames.length; i++) 

		included[i] = false; 



            if (typeof window.SimileAjax_onLoad == "string") 

		f = eval(window.SimileAjax_onLoad);

            else if (typeof window.SimileAjax_onLoad == "function") 

		f = window.SimileAjax_onLoad;



            window.SimileAjax_onLoad = null;

            includeJavascriptList(doc, urlPrefix, filenames, included, 0, f);

        }

    };



    SimileAjax.includeCssFile = function(doc, url) {

        if (doc.body == null) {

            try {

                doc.write("<link rel='stylesheet' href='" + url + "' type='text/css'/>");

                return;

            } catch (e) {

                // fall through

            }

        }

        

        var link = doc.createElement("link");

        link.setAttribute("rel", "stylesheet");

        link.setAttribute("type", "text/css");

        link.setAttribute("href", url);

        getHead(doc).appendChild(link);

    };

    SimileAjax.includeCssFiles = function(doc, urlPrefix, filenames) {

        for (var i = 0; i < filenames.length; i++) {

            SimileAjax.includeCssFile(doc, urlPrefix + filenames[i]);

        }

    };

    

    /**

     * Append into urls each string in suffixes after prefixing it with urlPrefix.

     * @param {Array} urls

     * @param {String} urlPrefix

     * @param {Array} suffixes

     */

    SimileAjax.prefixURLs = function(urls, urlPrefix, suffixes) {

        for (var i = 0; i < suffixes.length; i++) {

            urls.push(urlPrefix + suffixes[i]);

        }

    };



    /**

     * Parse out the query parameters from a URL

     * @param {String} url    the url to parse, or location.href if undefined

     * @param {Object} to     optional object to extend with the parameters

     * @param {Object} types  optional object mapping keys to value types

     *        (String, Number, Boolean or Array, String by default)

     * @return a key/value Object whose keys are the query parameter names

     * @type Object

     */

    SimileAjax.parseURLParameters = function(url, to, types) {

        to = to || {};

        types = types || {};

        

        if (typeof url == "undefined") {

            url = location.href;

        }

        var q = url.indexOf("?");

        if (q < 0) {

            return to;

        }

        url = (url+"#").slice(q+1, url.indexOf("#")); // toss the URL fragment

        

        var params = url.split("&"), param, parsed = {};

        var decode = window.decodeURIComponent || unescape;

        for (var i = 0; param = params[i]; i++) {

            var eq = param.indexOf("=");

            var name = decode(param.slice(0,eq));

            var old = parsed[name];

            var replacement = decode(param.slice(eq+1));

            

            if (typeof old == "undefined") {

                old = [];

            } else if (!(old instanceof Array)) {

                old = [old];

            }

            parsed[name] = old.concat(replacement);

        }

        for (var i in parsed) {

            if (!parsed.hasOwnProperty(i)) continue;

            var type = types[i] || String;

            var data = parsed[i];

            if (!(data instanceof Array)) {

                data = [data];

            }

            if (type === Boolean && data[0] == "false") {

                to[i] = false; // because Boolean("false") === true

            } else {

                to[i] = type.apply(this, data);

            }

        }

        return to;

    };

    

    if (!isCompiled) {

        (function() {

            var javascriptFiles = [

                "platform.js",

                "debug.js",

                "xmlhttp.js",

                "json.js",

                "dom.js",

                "graphics.js",

                "date-time.js",

                "string.js",

                "html.js",

                "data-structure.js",

                "units.js",

                

                "ajax.js",

                "history.js",

                "window-manager.js",

                "remoteLog.js"

            ];

            var cssFiles = [

                "graphics.css"

            ];

            if (!("jQuery" in window) && !("$" in window)) {

//                javascriptFiles.unshift("jquery-1.4.2.min.js");

		SimileAjax.includeJavascriptFile(document, "http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js");

            }

            



            if (typeof SimileAjax_urlPrefix == "string") {

                SimileAjax.urlPrefix = SimileAjax_urlPrefix;

            } else {

                var url = SimileAjax.findScript(document, "simile-ajax-api.js");

                if (url == null) {

                    SimileAjax.error = new Error("Failed to derive URL prefix for Simile Ajax API code files");

                    return;

                }



                SimileAjax.urlPrefix = url.substr(0, url.indexOf("simile-ajax-api.js"));

                SimileAjax.parseURLParameters(url, SimileAjax.params, { bundle: Boolean });

            }







            if (!isCompiled) {

                if (SimileAjax.params.bundle) {

                    SimileAjax.includeJavascriptFiles(document, SimileAjax.urlPrefix, [ "simile-ajax-bundle.js" ]);

                } else {

                    SimileAjax.includeJavascriptFiles(document, SimileAjax.urlPrefix + "scripts/", javascriptFiles);

                }

                SimileAjax.includeCssFiles(document, SimileAjax.urlPrefix + "styles/", cssFiles);

            }

            

            SimileAjax.loaded = true;

        })();

    }

}