From 820c3de1480e13cbf6fd5767ec5d5db1d80273f9 Mon Sep 17 00:00:00 2001
From: fanich37 <icima.fan@gmail.com>
Date: Sun, 13 Oct 2019 14:30:35 +0300
Subject: [PATCH] Make solution more proper and easier to reason about

---
 lib/selector.js       | 47 +++++++++++++++----------------------------
 test/selector.test.js | 32 ++++++-----------------------
 2 files changed, 22 insertions(+), 57 deletions(-)

diff --git a/lib/selector.js b/lib/selector.js
index 45c90561b..702b5f3ec 100644
--- a/lib/selector.js
+++ b/lib/selector.js
@@ -1,4 +1,4 @@
-let list = require('postcss').list
+let { list } = require('postcss')
 
 let OldSelector = require('./old-selector')
 let Prefixer = require('./prefixer')
@@ -55,42 +55,27 @@ class Selector extends Prefixer {
      */
   prefixeds (rule) {
     if (rule._autoprefixerPrefixeds) {
-      return rule._autoprefixerPrefixeds
+      if (rule._autoprefixerPrefixeds[this.name]) {
+        return rule._autoprefixerPrefixeds
+      }
+    } else {
+      rule._autoprefixerPrefixeds = {}
     }
 
     let prefixeds = {}
-
-    if (rule.selector.includes(',')) {
-      let separatedRule = list.comma(rule.selector)
-
-      this.all.add.selectors.forEach(selector => {
-        let name = selector.name
-        let selToProc = separatedRule.filter(el => el.includes(name))
-
-        if (selToProc.length) {
-          let possible = selector.possible()
-          prefixeds[name] = {}
-
-          possible.forEach(prefix => {
-            if (selToProc.length > 1) {
-              prefixeds[name][prefix] = selToProc
-                .map(sel => selector.replace(sel, prefix))
-                .join(', ')
-            } else {
-              prefixeds[name][prefix] = selector.replace(selToProc[0], prefix)
-            }
-          })
-        }
-      })
-    } else {
-      prefixeds[this.name] = {}
-
-      for (let prefix of this.possible()) {
-        prefixeds[this.name][prefix] = this.replace(rule.selector, prefix)
+    for (let prefix of this.possible()) {
+      if (rule.selector.includes(',')) {
+        let ruleParts = list.comma(rule.selector)
+        let toProcess = ruleParts.filter(el => el.includes(this.name))
+        prefixeds[prefix] = toProcess
+          .map(el => this.replace(el, prefix))
+          .join(', ')
+      } else {
+        prefixeds[prefix] = this.replace(rule.selector, prefix)
       }
     }
 
-    rule._autoprefixerPrefixeds = prefixeds
+    rule._autoprefixerPrefixeds[this.name] = prefixeds
     return rule._autoprefixerPrefixeds
   }
 
diff --git a/test/selector.test.js b/test/selector.test.js
index add8df5b2..afe4109b9 100644
--- a/test/selector.test.js
+++ b/test/selector.test.js
@@ -1,32 +1,10 @@
-let agents = require('caniuse-lite').agents
 let parse = require('postcss').parse
 
-let Browsers = require('../lib/browsers')
-let Prefixes = require('../lib/prefixes')
 let Selector = require('../lib/selector')
 
-let data = {
-  browsers: agents,
-  prefixes: {
-    '::selection': {
-      selector: true,
-      browsers: ['firefox 21', 'firefox 20 old', 'chrome 30', 'ie 6']
-    },
-    ':read-only': {
-      selector: true,
-      browsers: ['ie 7', 'firefox 20']
-    }
-  }
-}
-
-let fill = new Prefixes(
-  data.prefixes,
-  new Browsers(data.browsers, ['firefox 21', 'ie 7'])
-)
-
 let selector
 beforeEach(() => {
-  selector = new Selector('::selection', ['-moz-', '-ms-'], fill)
+  selector = new Selector('::selection', ['-moz-', '-ms-'])
 })
 
 describe('prefixed()', () => {
@@ -60,10 +38,12 @@ describe('check()', () => {
 })
 
 describe('prefixeds()', () => {
-  it('returns all available prefixed selectors for grouping rule', () => {
+  it('grouping rule gets correct _autoprefixerPrefixeds property', () => {
     let css = parse('.c::selection, .d:read-only {}')
-    let rSel = new Selector(':read-only', ['-moz-'], fill)
-    expect(rSel.prefixeds(css.first)).toEqual({
+    let rSel = new Selector(':read-only', ['-moz-'])
+    selector.prefixeds(css.first)
+    rSel.prefixeds(css.first)
+    expect(css.first._autoprefixerPrefixeds).toEqual({
       '::selection': {
         '-webkit-': '.c::-webkit-selection',
         '-moz-': '.c::-moz-selection',