30 lines
523 B
JavaScript
30 lines
523 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
const { isAtRule, isRule } = require('./typeGuards');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Find the at-rule in which a rule is nested.
|
||
|
|
*
|
||
|
|
* Returns `null` if the rule is not nested within an at-rule.
|
||
|
|
*
|
||
|
|
* @param {import('postcss').Rule} rule
|
||
|
|
* @returns {null | import('postcss').AtRule}
|
||
|
|
*/
|
||
|
|
module.exports = function findAtRuleContext(rule) {
|
||
|
|
const parent = rule.parent;
|
||
|
|
|
||
|
|
if (!parent) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (isAtRule(parent)) {
|
||
|
|
return parent;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (isRule(parent)) {
|
||
|
|
return findAtRuleContext(parent);
|
||
|
|
}
|
||
|
|
|
||
|
|
return null;
|
||
|
|
};
|