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index.js
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index.js
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'use strict';
const { parse } = require('css-tree');
const {
aNPlusBNotationPseudoClasses,
aNPlusBOfSNotationPseudoClasses,
} = require('../../reference/selectors');
const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
const report = require('../../utils/report');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const hasANPlusBNotationPseudoClasses = require('../../utils/hasANPlusBNotationPseudoClasses');
const ruleName = 'selector-anb-no-unmatchable';
const messages = ruleMessages(ruleName, {
rejected: (pseudoClass) => `Unexpected unmatchable An+B selector "${pseudoClass}"`,
});
const meta = {
url: 'https://stylelint.io/user-guide/rules/selector-anb-no-unmatchable',
};
function isUnmatchableNth(/** @type {import('css-tree').AnPlusB} */ nth) {
const { a, b } = nth;
if (a !== null && a !== '0' && a !== '-0') {
return false;
}
if (b !== null && b !== '0' && b !== '-0') {
return false;
}
return true;
}
/** @type {import('stylelint').Rule} */
const rule = (primary) => {
return (root, result) => {
const validOptions = validateOptions(result, ruleName, { actual: primary });
if (!validOptions) {
return;
}
root.walkRules((ruleNode) => {
if (!isStandardSyntaxRule(ruleNode)) {
return;
}
ruleNode.selectors.forEach((selector) => {
if (!hasANPlusBNotationPseudoClasses(selector)) return;
let cssTreeSelector;
try {
cssTreeSelector = parse(selector, { context: 'selector', positions: true });
} catch (e) {
return;
}
checkSelector(cssTreeSelector);
});
function checkSelector(/** @type {import('css-tree').CssNode} */ selector) {
if (selector.type !== 'Selector') {
return;
}
selector.children.forEach((selectorChild) => {
if (
selectorChild.type !== 'PseudoClassSelector' ||
(!aNPlusBNotationPseudoClasses.has(selectorChild.name) &&
!aNPlusBOfSNotationPseudoClasses.has(selectorChild.name))
) {
return;
}
const pseudoClassSelector = selectorChild;
if (pseudoClassSelector.children === null) {
return;
}
pseudoClassSelector.children.forEach((child) => {
if (child.type !== 'Nth' || child.nth.type !== 'AnPlusB') {
return;
}
if (isUnmatchableNth(child.nth)) {
report({
message: messages.rejected,
messageArgs: [`:${pseudoClassSelector.name}`],
node: ruleNode,
index: pseudoClassSelector.loc?.start.column,
endIndex: pseudoClassSelector.loc?.end.column,
result,
ruleName,
});
}
});
});
}
});
};
};
rule.ruleName = ruleName;
rule.messages = messages;
rule.meta = meta;
module.exports = rule;