/
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 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-compound-selectors';
const messages = ruleMessages(ruleName, {
expected: (selector, max) =>
`Expected "${selector}" to have no more than ${max} compound ${
max === 1 ? 'selector' : 'selectors'
}`,
});
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;
}
// Finds actual selectors in selectorNode object and checks them
function checkSelector(selectorNode, rule) {
let compoundCount = 1;
selectorNode.each((childNode) => {
// Only traverse inside actual selectors and context functional pseudo-classes
if (childNode.type === 'selector' || isContextFunctionalPseudoClass(childNode)) {
checkSelector(childNode, rule);
}
// Compound selectors are separated by combinators, so increase count when meeting one
if (childNode.type === 'combinator') {
compoundCount++;
}
});
if (selectorNode.type !== 'root' && selectorNode.type !== 'pseudo' && compoundCount > max) {
report({
ruleName,
result,
node: rule,
message: messages.expected(selectorNode, max),
word: selectorNode,
});
}
}
root.walkRules((rule) => {
if (!isStandardSyntaxRule(rule)) {
return;
}
// Using `rule.selectors` gets us each selector if there is a comma separated set
rule.selectors.forEach((selector) => {
resolvedNestedSelector(selector, rule).forEach((resolvedSelector) => {
// Process each resolved selector with `checkSelector` via postcss-selector-parser
parseSelector(resolvedSelector, result, rule, (s) => checkSelector(s, rule));
});
});
});
};
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;