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node_modules/stylelint/lib/rules/selector-nested-pattern/README.md

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+# selector-nested-pattern
+
+Specify a pattern for the selectors of rules nested within rules.
+
+```css
+    a {
+      color: orange;
+      &:hover { color: pink; }
+    } ↑
+/**   ↑
+ * These nested selectors */
+```
+
+Non-standard selectors (e.g. selectors with Sass or Less interpolation) and selectors of rules nested within at-rules are ignored.
+
+## Options
+
+`regex|string`
+
+A string will be translated into a RegExp — `new RegExp(yourString)` — so *be sure to escape properly*.
+
+The selector value will be checked in its entirety. If you'd like to allow for combinators and commas, you must incorporate them into your pattern.
+
+Given the string:
+
+```js
+"^&:(?:hover|focus)$"
+```
+
+The following patterns are considered warnings:
+
+```css
+a {
+  .bar {}
+}
+```
+
+```css
+a {
+  .bar:hover {}
+}
+```
+
+```css
+a {
+  &:hover,
+  &:focus {}
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  &:hover {}
+}
+```
+
+```css
+a {
+  &:focus {}
+}
+```
+
+```css
+a {
+  &:hover {}
+  &:focus {}
+}
+```

node_modules/stylelint/lib/rules/selector-nested-pattern/index.js

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+"use strict"
+
+const _ = require("lodash")
+const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule")
+const isStandardSyntaxSelector = require("../../utils/isStandardSyntaxSelector")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "selector-nested-pattern"
+
+const messages = ruleMessages(ruleName, {
+  expected: selector => `Expected nested selector "${selector}" to match specified pattern`,
+})
+
+const rule = function (pattern) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: pattern,
+      possible: [
+        _.isRegExp,
+        _.isString,
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    const normalizedPattern = _.isString(pattern) ? new RegExp(pattern) : pattern
+
+    root.walkRules(rule => {
+      if (rule.parent.type !== "rule") {
+        return
+      }
+      if (!isStandardSyntaxRule(rule)) {
+        return
+      }
+
+      const selector = rule.selector
+
+      if (!isStandardSyntaxSelector(selector)) {
+        return
+      }
+
+      if (normalizedPattern.test(selector)) {
+        return
+      }
+
+      report({
+        result,
+        ruleName,
+        message: messages.expected(selector),
+        node: rule,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule