stylelint/lib/rules/function-url-no-scheme-relative/index.cjs

A mighty CSS linter that helps you avoid errors and enforce conventions.

// NOTICE: This file is generated by Rollup. To modify it,
// please instead edit the ESM counterpart and rebuild with Rollup (npm run build).
'use strict';

const functionArgumentsSearch = require('../../utils/functionArgumentsSearch.cjs');
const isStandardSyntaxUrl = require('../../utils/isStandardSyntaxUrl.cjs');
const report = require('../../utils/report.cjs');
const ruleMessages = require('../../utils/ruleMessages.cjs');
const validateOptions = require('../../utils/validateOptions.cjs');

const ruleName = 'function-url-no-scheme-relative';

const messages = ruleMessages(ruleName, {
	rejected: 'Unexpected scheme-relative url',
});

const meta = {
	url: 'https://stylelint.io/user-guide/rules/function-url-no-scheme-relative',
};

/**
 * Reports scheme-relative URLs.
 *
 * @param {import('postcss').Node} node - The PostCSS node containing the URL.
 * @param {string} rawInput - The raw string to search (e.g., decl or params).
 * @param {import('stylelint').PostcssResult} result - The Stylelint result object.
 */
const reportSchemeRelativeUrl = (node, rawInput, result) => {
	functionArgumentsSearch(rawInput.toLowerCase(), 'url', (args, index) => {
		const url = args.trim().replace(/^['"]+|['"]+$/g, '');

		if (!isStandardSyntaxUrl(url) || !url.startsWith('//')) {
			return;
		}

		report({
			message: messages.rejected,
			messageArgs: [],
			node,
			index,
			endIndex: index + args.length,
			result,
			ruleName,
		});
	});
};

/** @type {import('stylelint').CoreRules[ruleName]} */
const rule = (primary) => {
	return (root, result) => {
		const validOptions = validateOptions(result, ruleName, { actual: primary });

		if (!validOptions) {
			return;
		}

		root.walkDecls((decl) => {
			reportSchemeRelativeUrl(decl, decl.toString(), result);
		});

		root.walkAtRules('import', (atRule) => {
			reportSchemeRelativeUrl(atRule, atRule.toString(), result);
		});
	};
};

rule.ruleName = ruleName;
rule.messages = messages;
rule.meta = meta;

module.exports = rule;