Javascript Simple url creator. Trim slashes.

url-parser.js

var site_url = window.site_url,
    site_path = window.site_path

var escapeRegExp = function escapeRegExp(str) {
    return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
}

/**
 * @param {boolean} [leftTrim]
 * @param {boolean} [rightTrim]
 * @returns {string}
 */
String.prototype.trimSlash = function trimSlash(leftTrim, rightTrim){
    var trimmerPatterns = []

    if (leftTrim === undefined || leftTrim){
        trimmerPatterns.push('^\/+')
    }
    if (rightTrim === undefined || rightTrim){
        trimmerPatterns.push('\/+$')
    }

    var trimmer = new RegExp(trimmerPatterns.join('|'), 'g')

    return this.replace(trimmer, '')
}

/**
 * @param [url]
 * @returns {string}
 */
String.prototype.getUrlPath = function getUrlPath(url){
    url = url || this
    return url.replace(new RegExp(escapeRegExp(site_url), 'i'), '').replace(/#.*/g, '').trimSlash(false, true)
}

/**
 * @param [url]
 * @returns {string}
 */
String.prototype.getUrlPathSimple = function getUrlPath(url){
    if (!typeof url === 'string') {
        throw new Error('url is not a string')
    }

    return url.substring(0, url.lastIndexOf('/')).trimSlash(false, true)
};

/**
 * @param [url]
 * @returns {string}
 */
var getUrlFile = function getUrlPath(url){
    if (!isString(url)) {
        throw new Error('url is not a string')
    }

    return url.substring(url.lastIndexOf('/')).trimSlash(true, true)
};

/**
 * @param {string|string[]}[uri]
 * @returns {string}
 */
String.prototype.createUrl = function createUrl(uri){
    if (uri instanceof Array){
        /** @var {Array} uri */
        uri = uri.join('/')
    }

    uri = uri ? String(uri) : ''

    var site_url_base = site_url.trimSlash(false, true)
    var url_path = this.trimSlash() + (uri ? '/' + uri.trimSlash() : '')

    return site_url_base + '/' + url_path.trimSlash()
}