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// ==UserScript== |
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// @name [e-dostavka.by, gipermall.by] price comparison |
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// @namespace http://tampermonkey.net/ |
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// @version 2.0 |
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// @description Show prices per kilo, compare between sites |
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// @author nomoreknights |
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// @match https://e-dostavka.by/* |
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// @match https://gipermall.by/* |
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// @grant unsafeWindow |
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// @grant GM.xmlHttpRequest |
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// @require https://cdnjs.cloudflare.com/ajax/libs/arrive/2.4.1/arrive.min.js |
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// @require https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.min.js |
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// @require https://unpkg.com/ohm-js@0.14.0/dist/ohm.min.js |
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// ==/UserScript== |
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(function () { |
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'use strict'; |
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const price = (() => { |
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const float = n => parseFloat(n.sourceString) |
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const priceG = ohm.grammar(`Price { Price = digit+ "р." digit+ "к." Price? }`) |
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const priceS = priceG.createSemantics().addOperation('val', { |
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Price: (rub, _2, kop, _4, _5) => float(rub) * 100 + float(kop), |
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}) |
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const weightG = ohm.grammar(`Weight { |
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Exp = BS* AnyWeight BS* AnyWeight? BS* |
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AnyWeight = MulWeight | Weight |
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Weight = float (OneUnit | ThUnit) |
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OneUnit = Dot<"г"> | Dot<"мл"> | Dot<"шт"> | Dot<"см"> |
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ThUnit = Dot<"кг"> | Dot<"л"> | Dot<"м"> |
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Dot<R> = R "."* |
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MulWeight = float ("x" | "х" | "*") Weight |
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BS = ~AnyWeight any |
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float = (digit digit* "." digit) -- fl |
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| digit+ |
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}`) |
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const weightS = weightG.createSemantics().addOperation('val', { |
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Exp: (_, weight, __, ___, _____) => weight.val(), |
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Weight: (n, u) => float(n) * u.val(), |
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OneUnit: _ => 1, ThUnit: _ => 1000, |
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MulWeight: (d, _, w) => float(d) * w.val(), |
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}) |
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const interpret = (g, s) => (text) => s(g.match(text)) |
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return (price, weight) => (interpret(priceG, priceS)(price).val() / interpret(weightG, weightS)(weight).val() / 100 * 1000) |
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})() |
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const $ = unsafeWindow.jQuery; // somehow, when @including jquery, infinite scroll stops working. |
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const template = $("<a/>").css({ |
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'background-color': '#fbba00', |
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'color': 'black', // default is #cb4f2b |
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'padding': '2px', |
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'border-radius': '5px', |
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'font-size': '14px', |
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'font-family': 'MyriadProCondencedBoldItalic', |
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'position': 'absolute', |
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'right': '5px' |
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}).attr('target', '_blank') |
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$(document).arrive(".products_card", { existing: true }, div => { |
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const normalizedPrice = price( |
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$(div).find('div > form > div.prices__wrapper > div > div.prices_block > div > div.price').text(), |
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$(div).find('a.fancy_ajax').text() |
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) |
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const button = template.clone() |
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const url = (R.test(/e-dostavka/, location.host) ? R.identity : R.flip)(R.replace)('e-dostavka', 'gipermall', $(div).find('a.fancy_ajax').attr('href')) |
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$(div).find('a.fa').replaceWith(button) |
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button.text(normalizedPrice.toFixed(2)) |
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GM.xmlHttpRequest({ |
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method: 'GET', url, onload: page => { |
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try { |
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const html = $($.parseHTML(page.responseText)) |
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const competingPrice = price( |
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html.find('div.services_wrap:nth-child(3) > div:nth-child(1) > div:nth-child(1) > div:nth-child(1)').text(), |
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html.find('.template_1_columns > h1:nth-child(2)').text() |
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) |
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const difference = Math.abs(1 - competingPrice / normalizedPrice) * 100 |
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button.text((i, _) => `${_} (${competingPrice >= normalizedPrice ? '>' : '<'}${difference.toFixed(0)}%)`).prop('href', url) |
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} catch (e) { } |
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} |
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}); |
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}); |
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})(); |