Get Programming with JavaScript

Get Programming with JavaScript - Listing 9.11

Listing 9.11 - A Place constructor part 3

// 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;
    }
};


// The Place constructor

var Place = function (title, description) {
    var newLine = spacer.newLine();

    this.title = title;
    this.description = description;
    this.items = [];
    this.exits = [];

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

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

        this.exits.forEach(function (exit) {
            exitsString += "   - " + exit.title;
            exitsString += newLine;
        });

        return exitsString;
    };

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

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


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

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

    this.addExit = function (exit) {
        this.exits.push(exit);
    };
};


// Test the Place constructor

var library = new Place(
    "The Old Library",
    "You are in a library. Dusty books line the walls."
);

var kitchen = new Place(
    "The Kitchen",
    "You are in the kitchen. There is a disturbing smell."
);

var hall = new Place(
    "The Main Hall",
    "You are in a large hall. It is strangely empty."
);

library.addItem("a rusty key");
library.addExit(kitchen);
library.addExit(hall);

library.showInfo();

Further Adventures

Listing 9.11 - A Place constructor part 3 - Tasks 1 to 4

Add a fourth place.
Add some items to your new place.
Add some exits to your new place.
Use showInfo to display info about your new place.

var dungeon = new Place(
    "The Dungeon",
    "You are in a dark, dank, dungeon."
);

dungeon.addItem("The Sword of Doom");
dungeon.addItem("The Sword of Doom2");

dungeon.addExit(library);
dungeon.addExit(hall);

dungeon.showInfo();