// Taken from "Remedial Javascript" by Douglas Crockford:
// http://javascript.crockford.com/remedial.html

function typeOf(value) {
    var s = typeof value;
    if (s === 'object') {
        if (value) {
            if (typeof value.length === 'number' &&
                    !(value.propertyIsEnumerable('length')) &&
                    typeof value.splice === 'function') {
                s = 'array';
            }
        } else {
            s = 'null';
        }
    }
    return s;
}


function isEmpty(o) {
    var i, v;
    if (typeOf(o) === 'object') {
        for (i in o) {
            v = o[i];
            if (v !== undefined && typeOf(v) !== 'function') {
                return false;
            }
        }
    }
    return true;
}

String.prototype.entityify = function () {
    return this.replace(/&/g, "&amp;").replace(/</g,
        "&lt;").replace(/>/g, "&gt;");
};

String.prototype.quote = function () {
    var c, i, l = this.length, o = '"';
    for (i = 0; i < l; i += 1) {
        c = this.charAt(i);
        if (c >= ' ') {
            if (c === '\\' || c === '"') {
                o += '\\';
            }
            o += c;
        } else {
            switch (c) {
            case '\b':
                o += '\\b';
                break;
            case '\f':
                o += '\\f';
                break;
            case '\n':
                o += '\\n';
                break;
            case '\r':
                o += '\\r';
                break;
            case '\t':
                o += '\\t';
                break;
            default:
                c = c.charCodeAt();
                o += '\\u00' + Math.floor(c / 16).toString(16) +
                    (c % 16).toString(16);
            }
        }
    }
    return o + '"';
};

String.prototype.supplant = function (o) {
    return this.replace(/{([^{}]*)}/g,
        function (a, b) {
            var r = o[b];
            return typeof r === 'string' || typeof r === 'number' ? r : a;
        }
    );
};

String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g, "");
};