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Crazycatz00 / Amazon Link Shortener

// ==UserScript==
// @name		Amazon Link Shortener
// @namespace	Crazycatz00
// @description	Adds a tiny link on (most) Amazon product pages. Can also optionally calculate taxes on (most) prices. (Up to the user to decide where it's applicable.)
// @match		*://*.amazon.com/*
// @match		*://*.amazon.co.uk/*
// @version		1.0.3
// @grant		none
// ==/UserScript==

(function(){'use strict';
	const TAX_RATE = 0.00;

	// --- Link Generator
	var asin = window.sitbAsin || window.ue_pti || (document.getElementById('ASIN') || {}).value,
		p;
	// Last-ditch, URL-sniffing effort
	if(typeof asin !== 'string' || asin.length < 10){
		if(window.location.pathname.search(/\/([A-Z0-9]{10})\/?/)!==-1){asin = RegExp.$1;}
		else{asin = undefined;}
	}
	if(asin &&
		(p = document.getElementById('brandByline_feature_div'))
		|| (p = document.getElementById('title_feature_div'))
		|| ((p = document.getElementById('btAsinTitle')) && (p = p.parentNode) && (p = p.parentNode))
		|| (p = document.getElementById('average-customer-reviews_feature_div'))
	  ){
		p = p.parentNode.insertBefore(document.createElement('a'), p.nextSibling);
		p.textContent = '[Tiny Link]';
		p.href = '//amzn.com/' + asin;
		p.className = 'a-size-mini';
	}
	
	// --- Tax calculator
	if(TAX_RATE > 0){
		p = function(e){
			if(!e.title && e.textContent.search(/^\s*\$(\d+(?:\.\d+)?)\s*$/) !== -1 && RegExp.$1 > 0){
				e.title = 'Tax: $' + (RegExp.$1 * TAX_RATE).toFixed(2) + '\nAmazon.com only';
			}else{
				console.log(e);
			}
		};
		Array.forEach(document.getElementsByClassName('a-color-price'), p);
		Array.forEach(document.getElementsByClassName('price'), p);
		Array.forEach(document.getElementsByClassName('priceLarge'), p);
	}
}());