Get Programming with JavaScript

Get Programming with JavaScript - Listing 11.17

Listing 11.17 - Lots of global variables in the game

// The spacer namespace

var spacer = {
    blank: function () {
        return "";
    },

    newLine: function () {
        return "\n";
    },

    line: function (length, character) {
        var longString = "****************************************";
        longString += "----------------------------------------";
        longString += "========================================";
        longString += "++++++++++++++++++++++++++++++++++++++++";
        longString += "                                        ";

        length = Math.max(0, length);
        length = Math.min(40, length);
        return longString.substr(longString.indexOf(character), length);
    },

    wrap : function (text, length, character) {
        var padLength = length - text.length - 3;
        var wrapText = character + " " + text;
        wrapText += spacer.line(padLength, " ");
        wrapText += character;
        return wrapText;
    },

    box: function (text, length, character) {
        var boxText = spacer.newLine();
        boxText += spacer.line(length, character) + spacer.newLine();
        boxText += spacer.wrap(text, length, character) + spacer.newLine();
        boxText += spacer.line(length, character) + spacer.newLine();
        return boxText;
    }
};


// Constructors

var Player = function (name, health) {
    var newLine = spacer.newLine();
    var items = [];
    var place = null;

    var getNameInfo = function () {
        return name;
    };

    var getHealthInfo = function () {
        return "(" + health + ")";
    };

    var getItemsInfo = function () {
        var itemsString = "Items:" + newLine;

        items.forEach(function (item, i) {
            itemsString += "   - " + item + newLine;
        });

        return itemsString;
    };

    var getTitleInfo = function () {
        return getNameInfo() + " " + getHealthInfo();
    };

    var getInfo = function () {
        var info = spacer.box(getTitleInfo(), 40, "*");
        info += "  " + getItemsInfo();
        info += spacer.line(40, "*");
        info += newLine;

        return info;
    };

    this.addItem = function (item) {
        items.push(item);
    };

    this.setPlace = function (destination) {
        place = destination;
    };

    this.getPlace = function () {
        return place;
    };

    this.showInfo = function (character) {
        console.log(getInfo(character));
    };
};

var Place = function (title, description) {
    var newLine = spacer.newLine();
    var items = [];
    var exits = {};

    var getItemsInfo = function () {
        var itemsString = "Items: " + newLine;
        items.forEach(function (item) {
            itemsString += "   - " + item;
            itemsString += newLine;
        });
        return itemsString;
    };

    var getExitsInfo = function () {
        var exitsString = "Exits from " + title;
        exitsString += ":" + newLine;

        Object.keys(exits).forEach(function (key) {
            exitsString += "   - " + key;
            exitsString += newLine;
        });

        return exitsString;
    };

    var getTitleInfo = function () {
        return spacer.box(title, title.length + 4, "=");
    };

    var getInfo = function () {
        var infoString = getTitleInfo();
        infoString += description;
        infoString += newLine + newLine;
        infoString += getItemsInfo() + newLine;
        infoString += getExitsInfo();
        infoString += spacer.line(40, "=") + newLine;
        return infoString;
    };


    this.showInfo = function () {
        console.log(getInfo());
    };

    this.addItem = function (item) {
        items.push(item);
    };

    this.addExit = function (direction, exit) {
        exits[direction] = exit;
    };

    this.getExit = function (direction) {
        return exits[direction];
    };

    this.getLastItem = function () {
        return items.pop();
    };
};


// Game controls

var render = function () {
    console.clear();
    player.getPlace().showInfo();
    player.showInfo();
};

var go = function (direction) {
    var place = player.getPlace();
    var destination = place.getExit(direction);
    player.setPlace(destination);
    render();
    return "";
};

var get = function () {
    var place = player.getPlace();
    var item = place.getLastItem();
    player.addItem(item);
    render();
    return "";
};


// Map

var kitchen = new Place(
    "The Kitchen",
    "You are in a kitchen. There is a disturbing smell."
);
var library = new Place(
    "The Old Library",
    "You are in a library. Dusty books line the walls."
);

kitchen.addItem("a piece of cheese");
library.addItem("a rusty key");

kitchen.addExit("south", library);
library.addExit("north", kitchen);


// Game initialization

var player = new Player("Kandra", 50);
player.addItem("The Sword of Doom");
player.setPlace(kitchen);

render();