--- /dev/null
+"use strict";
+
+const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule");
+const isStandardSyntaxSelector = require("../../utils/isStandardSyntaxSelector");
+const keywordSets = require("../../reference/keywordSets");
+const parseSelector = require("../../utils/parseSelector");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+
+const ruleName = "selector-pseudo-class-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 startIndexPseudo = selector.indexOf(":");
+
+ if (startIndexPseudo === -1) {
+ return;
+ }
+
+ parseSelector(selector, result, rule, selectorTree => {
+ selectorTree.walkPseudos(pseudoNode => {
+ const pseudo = pseudoNode.value;
+
+ if (!isStandardSyntaxSelector(pseudo)) {
+ return;
+ }
+
+ if (
+ pseudo.indexOf("::") !== -1 ||
+ keywordSets.levelOneAndTwoPseudoElements.has(
+ pseudo.toLowerCase().slice(1)
+ )
+ ) {
+ return;
+ }
+
+ const expectedPseudo =
+ expectation === "lower"
+ ? pseudo.toLowerCase()
+ : pseudo.toUpperCase();
+
+ if (pseudo === expectedPseudo) {
+ return;
+ }
+
+ report({
+ message: messages.expected(pseudo, expectedPseudo),
+ node: rule,
+ index: pseudoNode.sourceIndex,
+ ruleName,
+ result
+ });
+ });
+ });
+ });
+ };
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;