Add script

e-dostavka.user.js

@@ -13,36 +13,44 @@
 // @require      https://unpkg.com/ohm-js@0.14.0/dist/ohm.min.js
 // ==/UserScript==
 
-(function () {
+; (function ($) {
     'use strict';
     const price = (() => {
-        const float = n => parseFloat(n.sourceString)
-        const priceG = ohm.grammar(`Price { Price = digit+ "р." digit+ "к." Price? }`)
-        const priceS = priceG.createSemantics().addOperation('val', {
-            Price: (rub, _2, kop, _4, _5) => float(rub) * 100 + float(kop),
-        })
-        const weightG = ohm.grammar(`Weight {
-            Exp       = BS* AnyWeight BS* AnyWeight? BS*
-            AnyWeight = MulWeight | Weight
-            Weight    = float (OneUnit | ThUnit)
-            OneUnit   = Dot<"г">  | Dot<"мл"> | Dot<"шт"> | Dot<"см">
-            ThUnit    = Dot<"кг"> | Dot<"л"> | Dot<"м">
-            Dot<R>    = R "."*
-            MulWeight = float ("x" | "х" | "*") Weight
-            BS        = ~AnyWeight any
-            float = (digit digit* "." digit) -- fl
-            	| digit+
+        const priceGrammar = ohm.grammar(`Price { 
+                Price   = integer "р." integer "к." Price?
+                integer = digit+
             }`)
-        const weightS = weightG.createSemantics().addOperation('val', {
-            Exp: (_, weight, __, ___, _____) => weight.val(),
-            Weight: (n, u) => float(n) * u.val(),
-            OneUnit: _ => 1, ThUnit: _ => 1000,
-            MulWeight: (d, _, w) => float(d) * w.val(),
+        const priceVal = priceGrammar.createSemantics().addOperation('val', {
+            Price: (rub, _1, kop, _2, _3) => rub.val() + kop.val() * 0.01,
+            integer: _ => parseInt(_.sourceString)
         })
-        const interpret = (g, s) => (text) => s(g.match(text))
-        return (price, weight) => (interpret(priceG, priceS)(price).val() / interpret(weightG, weightS)(weight).val() / 100 * 1000)
+        const weightGrammar = ohm.grammar(`Weight {
+                    Exp       = BS AnyWeight BS AnyWeight? BS
+                    AnyWeight = MulWeight | Weight
+                    Weight    = float (Unit1 | Unit10 | Unit1000) "."*
+                    MulWeight = float ("x" | "х" | "*") Weight
+                    float     = digit+ ("." digit+)? -- fl
+                    Unit1     = "г"  | "мл"
+                    Unit10    = "см"
+                    Unit1000  = "кг" | "л" | "м" | "шт"
+                    BS        = (~AnyWeight any)*
+                    }`)
+        const weightVal = weightGrammar.createSemantics().addOperation('val', {
+            Exp: (_1, weight, _2, _3, _4) => weight.val(),
+            Weight: (n, u, _1) => n.val() * u.val(),
+            MulWeight: (d, _, w) => d.val() * w.val(),
+            Unit1: _ => 0.001,
+            Unit10: _ => 0.01,
+            Unit1000: _ => 1,
+            float: _ => parseFloat(_.sourceString)
+        })
+        const interpret = (grammar, semantics, text) => {
+            const match = grammar.match(text)
+            if (match.failed()) console.log(`Failed to parse [${text}] with ${match.message}`)
+            return semantics(match).val()
+        }
+        return (price, weight) => interpret(priceGrammar, priceVal, price) / interpret(weightGrammar, weightVal, weight)
     })()
-    const $ = unsafeWindow.jQuery; // somehow, when @including jquery, infinite scroll stops working.
     const template = $("<a/>").css({
         'background-color': '#fbba00',
         'color': 'black', // default is #cb4f2b
@@ -54,14 +62,15 @@
         'right': '5px'
     }).attr('target', '_blank')
     $(document).arrive(".products_card", { existing: true }, div => {
+        try {
             const normalizedPrice = price(
                 $(div).find('div > form > div.prices__wrapper > div > div.prices_block > div > div.price').text(),
                 $(div).find('a.fancy_ajax').text()
             )
-         const button = template.clone()
+            const link = template.clone()
+            $(div).find('a.fa').replaceWith(link)
+            link.text(normalizedPrice.toFixed(2))
             const url = (R.test(/e-dostavka/, location.host) ? R.identity : R.flip)(R.replace)('e-dostavka', 'gipermall', $(div).find('a.fancy_ajax').attr('href'))
-         $(div).find('a.fa').replaceWith(button)
-         button.text(normalizedPrice.toFixed(2))
             GM.xmlHttpRequest({
                 method: 'GET', url, onload: page => {
                     try {
@@ -70,10 +79,12 @@
                             html.find('div.services_wrap:nth-child(3) > div:nth-child(1) > div:nth-child(1) > div:nth-child(1)').text(),
                             html.find('.template_1_columns > h1:nth-child(2)').text()
                         )
-                     const difference = Math.abs(1 - competingPrice / normalizedPrice) * 100
-                     button.text((i, _) => `${_} (${competingPrice >= normalizedPrice ? '>' : '<'}${difference.toFixed(0)}%)`).prop('href', url)
-                 } catch (e) { }
+                        const diff = (1 - competingPrice / normalizedPrice) * 100
+                        link.text((_, text) => `${text} (${diff > 0 ? '>' : '<'}${Math.abs(diff).toFixed(0)}%)`)
+                            .prop('href', url)
+                    } catch (e) { console.log(`Failed to process page ${url}`, e) }
                 }
             });
+        } catch (e) { console.log(`Failed to process product card with ${$(div).find('a.fancy_ajax').text()}`, e) }
     });
-})();
+})(unsafeWindow.jQuery); // somehow, when @including jquery, infinite scroll stops working.