Source: events-tools/networktools.js

/*
 * GDevelop JS Platform
 * Copyright 2013-2016 Florian Rival ([email protected]). All rights reserved.
 * This project is released under the MIT License.
 */

/**
 * @memberof gdjs.evtTools
 * @namespace network
 */
gdjs.evtTools.network = gdjs.evtTools.network || {};

gdjs.evtTools.network.sendHttpRequest = function(host, uri, body, method, contentType, responseVar)
{
	try {
		var xhr;
	    if (typeof XMLHttpRequest !== 'undefined')
			xhr = new XMLHttpRequest();
	    else {
	        var versions = ["MSXML2.XmlHttp.5.0",
	                        "MSXML2.XmlHttp.4.0",
	                        "MSXML2.XmlHttp.3.0",
	                        "MSXML2.XmlHttp.2.0",
	                        "Microsoft.XmlHttp"]

	         for(var i = 0, len = versions.length; i < len; i++) {
	            try {
	                xhr = new ActiveXObject(versions[i]);
	                break;
	            }
	            catch(e){}
	         } // end for
	    }

	    if ( xhr === undefined ) return;

	    xhr.open(method, host+uri, false);
	    xhr.setRequestHeader( "Content-Type", contentType === "" ? "application/x-www-form-urlencoded" : contentType );
	    xhr.send(body);
		responseVar.setString(xhr.responseText);
	}
	catch(e){}
};

/**
 * Convert a variable to JSON.
 * TODO: Move to gdjs.Variable static
 * @param {gdjs.Variable} variable The variable to convert to JSON
 * @returns {string} The JSON string representing the variable 
 */
gdjs.evtTools.network.variableStructureToJSON = function(variable)
{
    if ( !variable.isStructure() ) {
        if ( variable.isNumber() )
            return JSON.stringify(variable.getAsNumber());
        else
            return JSON.stringify(variable.getAsString());
    }

    var str = "{";
    var firstChild = true;
    var children = variable.getAllChildren();
    for(var p in children) {
        if (children.hasOwnProperty(p)) {
	        if ( !firstChild ) str += ",";
	        str += JSON.stringify(p) + ": " + gdjs.evtTools.network.variableStructureToJSON(children[p]);

	        firstChild = false;
	    }
    }

    str += "}";
    return str;
};

gdjs.evtTools.network.objectVariableStructureToJSON = function(object, variable)
{
	return gdjs.evtTools.network.variableStructureToJSON(variable);
}

gdjs.evtTools.network._objectToVariable = function(obj, variable)
{
	if(!isNaN(obj)) {  //Number
		variable.setNumber(obj);
	}
	else if (typeof obj == 'string' || obj instanceof String) {
		variable.setString(obj);
	}
    else if ( Array.isArray(obj) ) {
	    for(var i = 0;i<obj.length;++i) {
	        gdjs.evtTools.network._objectToVariable(obj[i], variable.getChild(i.toString()));
		}
	}
	else {
	    for(var p in obj) {
	        if (obj.hasOwnProperty(p)) {
	        	gdjs.evtTools.network._objectToVariable(obj[p], variable.getChild(p));
	        }
		}
	}

}

/**
 * Parse the given JSON and fill the content of the variable with it
 * TODO: Move to gdjs.Variable static
 * @param {string} jsonStr The JSON string
 * @param {gdjs.Variable} variable The variable where to put the parsed JSON
 * @returns {boolean} true if JSON was properly parsed
 */
gdjs.evtTools.network.jsonToVariableStructure = function(jsonStr, variable)
{
    if ( jsonStr.length === 0 ) return false;
    try {
		var obj = JSON.parse(jsonStr);
		gdjs.evtTools.network._objectToVariable(obj, variable);
		return true;
	} catch(e) {
		//Do nothing iF JSON was not properly parsed;
		return false;
	}
}

gdjs.evtTools.network.jsonToObjectVariableStructure = function(jsonStr, object, variable)
{
	gdjs.evtTools.network.jsonToVariableStructure(jsonStr, variable);
}