stylelint/lib/utils/getPreviousNonSharedLineCommentNode.js

A mighty, modern CSS linter.

/* @flow */
'use strict';

const _ = require('lodash');

function getNodeLine(node /*:: ?: postcss$node*/) /*: number | void*/ {
	return _.get(node, 'source.start.line');
}

module.exports = function getPreviousNonSharedLineCommentNode(
	node /*:: ?: postcss$node*/,
) /*: postcss$node | void*/ {
	if (node === undefined) {
		return undefined;
	}

	const previousNode = node.prev();

	if (_.get(previousNode, 'type') !== 'comment') {
		return previousNode;
	}

	if (
		getNodeLine(node) === getNodeLine(previousNode) ||
		(previousNode !== undefined && getNodeLine(previousNode) === getNodeLine(previousNode.prev()))
	) {
		return getPreviousNonSharedLineCommentNode(previousNode);
	}

	return previousNode;
};