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