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# selector-max-id
Limit the number of ID selectors in a selector.
<!-- prettier-ignore -->
```css
#foo {}
/** ↑
* This type of selector */
```
This rule resolves nested selectors before counting the number of ID selectors. 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 universal selectors allowed.
For example, with `2`:
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
#foo #bar #baz {}
```
<!-- prettier-ignore -->
```css
#foo #bar {
& #baz {}
}
```
<!-- prettier-ignore -->
```css
#foo #bar {
& > #bar {}
}
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
#foo {}
```
<!-- prettier-ignore -->
```css
#foo #bar {}
```
<!-- prettier-ignore -->
```css
.foo #foo {}
```
<!-- prettier-ignore -->
```css
#foo.foo #bar {}
```
<!-- prettier-ignore -->
```css
/* each selector in a selector list is evaluated separately */
#foo,
#baz #quux {}
```
<!-- prettier-ignore -->
```css
/* `#bar` is inside `:not()`, so it is evaluated separately */
#foo #bar:not(#baz) {}
```
### `ignoreContextFunctionalPseudoClasses: ["/regex/", /regex/, "non-regex"]`
Ignore selectors inside of specified [functional pseudo-classes](https://drafts.csswg.org/selectors-4/#pseudo-classes) that provide [evaluation contexts](https://drafts.csswg.org/selectors-4/#specificity-rules).
Given:
```js
[":not", /^:(h|H)as$/];
```
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a:matches(#foo) {}
```
While the following patters are _not_ considered violations:
<!-- prettier-ignore -->
```css
a:not(#foo) {}
```
<!-- prettier-ignore -->
```css
a:has(#foo) {}
```
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// @ts-nocheck
'use strict';
const _ = require('lodash');
const isContextFunctionalPseudoClass = require('../../utils/isContextFunctionalPseudoClass');
const isNonNegativeInteger = require('../../utils/isNonNegativeInteger');
const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
const optionsMatches = require('../../utils/optionsMatches');
const parseSelector = require('../../utils/parseSelector');
const report = require('../../utils/report');
const resolvedNestedSelector = require('postcss-resolve-nested-selector');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const ruleName = 'selector-max-id';
const messages = ruleMessages(ruleName, {
expected: (selector, max) =>
`Expected "${selector}" to have no more than ${max} ID ${max === 1 ? 'selector' : 'selectors'}`,
});
function rule(max, options) {
return (root, result) => {
const validOptions = validateOptions(
result,
ruleName,
{
actual: max,
possible: isNonNegativeInteger,
},
{
actual: options,
possible: {
ignoreContextFunctionalPseudoClasses: [_.isString, _.isRegExp],
},
optional: true,
},
);
if (!validOptions) {
return;
}
function checkSelector(selectorNode, ruleNode) {
const count = selectorNode.reduce((total, childNode) => {
// Only traverse inside actual selectors and context functional pseudo-classes that are not part of ignored functional pseudo-classes
if (
childNode.type === 'selector' ||
(isContextFunctionalPseudoClass(childNode) &&
!isIgnoredContextFunctionalPseudoClass(childNode))
) {
checkSelector(childNode, ruleNode);
}
return (total += childNode.type === 'id' ? 1 : 0);
}, 0);
if (selectorNode.type !== 'root' && selectorNode.type !== 'pseudo' && count > max) {
report({
ruleName,
result,
node: ruleNode,
message: messages.expected(selectorNode, max),
word: selectorNode,
});
}
}
function isIgnoredContextFunctionalPseudoClass(node) {
return (
node.type === 'pseudo' &&
optionsMatches(options, 'ignoreContextFunctionalPseudoClasses', node.value)
);
}
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;