Expression Spy

//=============================================================================
// ExpressionSpy.js v1.1
//=============================================================================

/*:
 * @plugindesc Updates selected expressions in real time in a separate window.
 * <id:Expression Spy>
 * @author Drykul
 *
 * @param Game Variables
 * @desc The $gameVariables to be monitored.                          Ex: 1, 2, 5, 15
 * @default
 *
 * @param Game Switches
 * @desc The $gameSwitches to be monitored.                           Ex: 1, 2, 5, 15
 * @default
 *
 * @param Custom Expressions
 * @desc Custom expressions to be monitored.                          Ex: $gameActors.actor(1).hp, myCustomVar, 1 + 2
 * @default
 *
 * @help
 * The custom expression field can be literally any expression you'd like to
 * monitor, including any calculations. Entries such as
 * $gameActors.actor(1).hp + $gameVariables.value(1)
 * will be accepted and evaluated.
 *
 * If you have any bugs to report, requests, or questions you can contact me
 * at drykul(at)cloud9studios.net. I'm also on www.rpgmakerweb.com and
 * www.rpgmakervxace.net as shaynec1981 as well as www.rpgmakermv.co as drykul.
 *
 * No credit is necessary for use of this script in either free
 * or commercial projects. Just shoot me a line and let me know if it was
 * worth your time! :)
 *
 * /~~CHANGE LOG~~/
 * 3-23-16: 1.1 release - changed update to Game_Screen
 *                      - fixed multiple expression spy windows being open at once
 *                      - expression spy window now won't open if no variables,
 *                        switches, or expressions are specified
 *
 * 3-22-16: 1.0 release
 */

////// Main function
function expressionSpy() {
    if (typeof Scene_Map.prototype.expressionSpyWindow != 'undefined' && typeof Scene_Map.prototype.expressionSpyWindow.document != 'undefined') {
        Scene_Map.prototype.expressionSpyWindow.document.open();
        if (esVariablesArray[0] != "") {
            for (i = 0; i < esVariablesArray.length; i++) {
                Scene_Map.prototype.expressionSpyWindow.document.write("$gameVariables[" + esVariablesArray[i] + "] = " + $gameVariables.value(esVariablesArray[i]) + "<br>");
            };
            Scene_Map.prototype.expressionSpyWindow.document.write("---------------------------------------------------------------" + "<br>");
        };
        if (esSwitchesArray[0] != "") {
            for (i = 0; i < esSwitchesArray.length; i++) {
                Scene_Map.prototype.expressionSpyWindow.document.write("$gameSwitches[" + esSwitchesArray[i] + "] = " + $gameSwitches.value(esSwitchesArray[i]) + "<br>");
            };
            Scene_Map.prototype.expressionSpyWindow.document.write("---------------------------------------------------------------" + "<br>");
        };
        if (esExpressionsArray[0] != "") {
            for (i = 0; i < esExpressionsArray.length; i++) {

                try {
                    Scene_Map.prototype.expressionSpyWindow.document.write(esExpressionsArray[i] + " = " + eval(esExpressionsArray[i]) + "<br>");
                } catch (err) {
                    Scene_Map.prototype.expressionSpyWindow.document.write("Watched expression " + esExpressionsArray[i] + " does not exist!" + "<br>");
                };
            };
        };
    };
};

////// Create variables and Expression Spy window
var alis_SM_initialize = Scene_Map.prototype.initialize;
Scene_Map.prototype.initialize = function () {

    var scriptParameters = $plugins.filter(function (p) {
        return p.description.contains("<id:Expression Spy>")
    })[0].parameters;

    esVariablesArray = scriptParameters['Game Variables'].split(",");
    for (i = 0; i < esVariablesArray.length; i++) {
        esVariablesArray[i] = esVariablesArray[i].trim();
    };
    esVariablesArray = uniq(esVariablesArray);

    esSwitchesArray = scriptParameters['Game Switches'].split(",");
    for (i = 0; i < esSwitchesArray.length; i++) {
        esSwitchesArray[i] = esSwitchesArray[i].trim();
    };
    esSwitchesArray = uniq(esSwitchesArray);

    esExpressionsArray = scriptParameters['Custom Expressions'].split(",");
    esExpressionsArray = uniq(esExpressionsArray);

    alis_SM_initialize.call(this);
    if (typeof Scene_Map.prototype.expressionSpyWindow != 'undefined') {
        Scene_Map.prototype.expressionSpyWindow.close();
    };
    if (scriptParameters['Game Variables'] != "" || scriptParameters['Game Switches'] != "" || scriptParameters['Custom Expressions'] != "") {
        Scene_Map.prototype.expressionSpyWindow = window.open();
        Scene_Map.prototype.expressionSpyWindow.resizeTo(800, 400);
        Scene_Map.prototype.expressionSpyWindow.moveTo(0, 300);
        require('nw.gui').Window.get().focus();
    };
};


////// Call ExpressionSpy every update frame from Game_Screen
var alias_GS_Update = Game_Screen.prototype.update;
Game_Screen.prototype.update = function () {
    alias_GS_Update.call(this);
    expressionSpy();
};


////// Remove duplicate entries from an array
function uniq(a) {
    var seen = {};
    return a.filter(function (item) {
        return seen.hasOwnProperty(item) ? false : (seen[item] = true);
    });
};