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node_modules/stylelint/lib/rules/selector-pseudo-element-case/README.md

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+# selector-pseudo-element-case
+
+Specify lowercase or uppercase for pseudo-element selectors.
+
+```css
+    a::before {}
+/**    ↑
+ * This is pseudo-element selector */
+```
+
+## Options
+
+`string`: `"lower"|"upper"`
+
+### `"lower"`
+
+The following patterns are considered warnings:
+
+```css
+a:Before {}
+```
+
+```css
+a:bEfOrE {}
+```
+
+```css
+a:BEFORE {}
+```
+
+```css
+a::Before {}
+```
+
+```css
+a::bEfOrE {}
+```
+
+```css
+a::BEFORE {}
+```
+
+```css
+input::-MOZ-PLACEHOLDER {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a:before {}
+```
+
+```css
+a::before {}
+```
+
+```css
+input::-moz-placeholder {}
+```
+
+### `"upper"`
+
+The following patterns are considered warnings:
+
+```css
+a:Before {}
+```
+
+```css
+a:bEfOrE {}
+```
+
+```css
+a:BEFORE {}
+```
+
+```css
+a::Before {}
+```
+
+```css
+a::bEfOrE {}
+```
+
+```css
+a::before {}
+```
+
+```css
+input::-moz-placeholder {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a:BEFORE {}
+```
+
+```css
+a::BEFORE {}
+```
+
+```css
+input::-MOZ-PLACEHOLDER {}
+```

node_modules/stylelint/lib/rules/selector-pseudo-element-case/index.js

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+"use strict"
+
+const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule")
+const isStandardSyntaxSelector = require("../../utils/isStandardSyntaxSelector")
+const parseSelector = require("../../utils/parseSelector")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const keywordSets = require("../../reference/keywordSets")
+
+const ruleName = "selector-pseudo-element-case"
+
+const messages = ruleMessages(ruleName, {
+  expected: (actual, expected) => `Expected "${actual}" to be "${expected}"`,
+})
+
+const rule = function (expectation) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "lower",
+        "upper",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkRules(rule => {
+      if (!isStandardSyntaxRule(rule)) {
+        return
+      }
+      const selector = rule.selector
+      const startIndexPseudoElement = selector.indexOf(":")
+
+      if (startIndexPseudoElement === -1) {
+        return
+      }
+
+      parseSelector(selector, result, rule, selectorTree => {
+        selectorTree.walkPseudos(pseudoNode => {
+          const pseudoElement = pseudoNode.value
+
+          if (!isStandardSyntaxSelector(pseudoElement)) {
+            return
+          }
+
+          if (pseudoElement.indexOf("::") === -1 && !keywordSets.levelOneAndTwoPseudoElements.has(pseudoElement.toLowerCase().slice(1))) {
+            return
+          }
+
+          const expectedPseudoElement = expectation === "lower" ? pseudoElement.toLowerCase() : pseudoElement.toUpperCase()
+
+          if (pseudoElement === expectedPseudoElement) {
+            return
+          }
+
+          report({
+            message: messages.expected(pseudoElement, expectedPseudoElement),
+            node: rule,
+            index: pseudoNode.sourceIndex,
+            ruleName,
+            result,
+          })
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule