/
index.js
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/
index.js
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// @ts-nocheck
'use strict';
const isContextFunctionalPseudoClass = require('../../utils/isContextFunctionalPseudoClass');
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 context functional pseudo-classes
if (childNode.type === 'selector' || isContextFunctionalPseudoClass(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;