stylelint/lib/utils/findAtRuleContext.js

A mighty, modern CSS linter.

/* @flow */
'use strict';

/**
 * Find the at-rule in which a rule is nested.
 *
 * Returns `null` if the rule is not nested within an at-rule.
 */
module.exports = function findAtRuleContext(rule /*: postcss$rule */) /*: ?postcss$node*/ {
	const parent = rule.parent;

	if (parent.type === 'root') {
		return null;
	}

	if (parent.type === 'atrule') {
		return parent;
	}

	return findAtRuleContext(parent);
};