stylelint/lib/rules/selector-max-pseudo-class/index.js

A mighty, modern CSS linter.

// @ts-nocheck

'use strict';

const isLogicalCombination = require('../../utils/isLogicalCombination');
const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
const keywordSets = require('../../reference/keywordSets');
const parseSelector = require('../../utils/parseSelector');
const report = require('../../utils/report');
const resolvedNestedSelector = require('postcss-resolve-nested-selector');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');

const ruleName = 'selector-max-pseudo-class';

const messages = ruleMessages(ruleName, {
	expected: (selector, max) =>
		`Expected "${selector}" to have no more than ${max} pseudo-${max === 1 ? 'class' : 'classes'}`,
});

function rule(max) {
	return (root, result) => {
		const validOptions = validateOptions(result, ruleName, {
			actual: max,
			possible: [
				function (max) {
					return typeof max === 'number' && max >= 0;
				},
			],
		});

		if (!validOptions) {
			return;
		}

		function checkSelector(selectorNode, ruleNode) {
			const count = selectorNode.reduce((total, childNode) => {
				// Only traverse inside actual selectors and logical combinations
				if (childNode.type === 'selector' || isLogicalCombination(childNode)) {
					checkSelector(childNode, ruleNode);
				}

				// Exclude pseudo elements from the count
				if (
					childNode.type === 'pseudo' &&
					(childNode.value.includes('::') ||
						keywordSets.levelOneAndTwoPseudoElements.has(childNode.value.toLowerCase().slice(1)))
				) {
					return total;
				}

				if (childNode.type === 'pseudo') {
					return (total += 1);
				}

				return total;
			}, 0);

			if (count > max) {
				report({
					ruleName,
					result,
					node: ruleNode,
					message: messages.expected(selectorNode, max),
					word: selectorNode,
				});
			}
		}

		root.walkRules((ruleNode) => {
			if (!isStandardSyntaxRule(ruleNode)) {
				return;
			}

			ruleNode.selectors.forEach((selector) => {
				resolvedNestedSelector(selector, ruleNode).forEach((resolvedSelector) => {
					parseSelector(resolvedSelector, result, rule, (selectorTree) => {
						checkSelector(selectorTree, ruleNode);
					});
				});
			});
		});
	};
}

rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;