+++ /dev/null
-/* @flow */
-"use strict";
-
-const hasLessInterpolation = require("../utils/hasLessInterpolation");
-const hasPsvInterpolation = require("../utils/hasPsvInterpolation");
-const hasScssInterpolation = require("../utils/hasScssInterpolation");
-
-/**
- * Check whether a URL is standard
- */
-module.exports = function(url /*: string*/) /*: boolean*/ {
- if (url.length === 0) {
- return true;
- }
-
- // Sass interpolation works anywhere
- if (hasScssInterpolation(url) || hasPsvInterpolation(url)) {
- return false;
- }
-
- // Inside `'` and `"` work only LESS interpolation
- if (
- (url[0] === "'" && url[url.length - 1] === "'") ||
- (url[0] === '"' && url[url.length - 1] === '"')
- ) {
- if (hasLessInterpolation(url)) {
- return false;
- }
-
- return true;
- }
-
- // Less variable works only at the beginning
- // Check is less variable, allow use '@url/some/path'
- // https://github.com/less/less.js/blob/3.x/lib/less/parser/parser.js#L547
- if (url[0] === "@" && /^@@?[\w-]+$/.test(url)) {
- return false;
- }
-
- // In url without quotes scss variable can be everywhere
- // But in this case it is allowed to use only specific characters
- // Also forbidden "/" at the end of url
- if (
- url.indexOf("$") !== -1 &&
- /^[$\sA-Za-z0-9+-/*_'"/]+$/.test(url) &&
- url[url.length - 1] !== "/"
- ) {
- return false;
- }
-
- return true;
-};