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# selector-max-class
Limit the number of classes in a selector.
<!-- prettier-ignore -->
```css
div .foo.bar[data-val] > a.baz {}
/* ↑ ↑ ↑
↑ ↑ ↑
1 2 3 -- this selector contains three classes */
```
This rule resolves nested selectors before counting the number of classes in a selector. Each selector in a [selector list](https://www.w3.org/TR/selectors4/#selector-list) is evaluated separately.
The `:not()` pseudo-class is also evaluated separately. The rule processes the argument as if it were an independent selector, and the result does not count toward the total for the entire selector.
## Options
`int`: Maximum classes allowed.
For example, with `2`:
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
.foo.bar.baz {}
```
<!-- prettier-ignore -->
```css
.foo .bar {
& > .baz {}
}
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
div {}
```
<!-- prettier-ignore -->
```css
.foo .bar {}
```
<!-- prettier-ignore -->
```css
.foo.bar,
.lorem.ipsum {} /* each selector in a selector list is evaluated separately */
```
<!-- prettier-ignore -->
```css
.foo .bar :not(.lorem.ipsum) {} /* `.lorem.ipsum` is inside `:not()`, so it is evaluated separately */
```
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// @ts-nocheck
'use strict';
const isContextFunctionalPseudoClass = require('../../utils/isContextFunctionalPseudoClass');
const isNonNegativeInteger = require('../../utils/isNonNegativeInteger');
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-class';
const messages = ruleMessages(ruleName, {
expected: (selector, max) =>
`Expected "${selector}" to have no more than ${max} ${max === 1 ? 'class' : 'classes'}`,
});
function rule(max) {
return (root, result) => {
const validOptions = validateOptions(result, ruleName, {
actual: max,
possible: isNonNegativeInteger,
});
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);
}
return (total += childNode.type === 'class' ? 1 : 0);
}, 0);
if (selectorNode.type !== 'root' && selectorNode.type !== 'pseudo' && 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, ruleNode, (container) =>
checkSelector(container, ruleNode),
);
});
});
});
};
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;