fix: handle uppercase URL in import at-rules

lib/plugins/postcss-import-parser.js

@@ -1,9 +1,46 @@
 const postcss = require('postcss');
+const valueParser = require('postcss-value-parser');
 const loaderUtils = require('loader-utils');
-const Tokenizer = require('css-selector-tokenizer');
 
 const pluginName = 'postcss-import-parser';
 
+function getArg(nodes) {
+  return nodes.length !== 0 && nodes[0].type === 'string'
+    ? nodes[0].value
+    : valueParser.stringify(nodes);
+}
+
+function getUrl(node) {
+  if (node.type === 'function' && node.value.toLowerCase() === 'url') {
+    return getArg(node.nodes);
+  }
+
+  if (node.type === 'string') {
+    return node.value;
+  }
+
+  return '';
+}
+
+function parseImport(params) {
+  const { nodes } = valueParser(params);
+
+  if (nodes.length === 0) {
+    return null;
+  }
+
+  const url = getUrl(nodes[0]);
+
+  if (url.trim().length === 0) {
+    return null;
+  }
+
+  return {
+    url,
+    media: valueParser.stringify(nodes.slice(1)).trim(),
+  };
+}
+
 module.exports = postcss.plugin(
   pluginName,
   (options) =>
@@ -25,43 +62,22 @@ module.exports = postcss.plugin(
           return;
         }
 
-        const values = Tokenizer.parseValues(atrule.params);
-        let [url] = values.nodes[0].nodes;
+        const parsed = parseImport(atrule.params);
 
-        if (url && url.type === 'url') {
-          ({ url } = url);
-        } else if (url && url.type === 'string') {
-          url = url.value;
-        } else {
-          result.warn(`Unable to find uri in '${atrule.toString()}'`, {
+        if (!parsed) {
+          // eslint-disable-next-line consistent-return
+          return result.warn(`Unable to find uri in '${atrule.toString()}'`, {
             node: atrule,
           });
-
-          return;
         }
 
-        if (!url.replace(/\s/g, '').length) {
-          result.warn(`Unable to find uri in '${atrule.toString()}'`, {
-            node: atrule,
-          });
-
-          return;
-        }
-
-        values.nodes[0].nodes.shift();
-
-        const mediaQuery = Tokenizer.stringifyValues(values);
-
-        url = url.trim();
+        let { url } = parsed;
 
         if (loaderUtils.isUrlRequest(url)) {
           url = loaderUtils.urlToRequest(url);
         }
 
-        importItems.push({
-          url,
-          mediaQuery,
-        });
+        importItems.push({ url, mediaQuery: parsed.media });
 
         atrule.remove();
       });

test/__snapshots__/import-option.test.js.snap

@@ -184,8 +184,7 @@ Array [
   ],
   Array [
     1,
-    "@import URL(test.css);
-@import url();
+    "@import url();
 @import url('');
 @import url(\\"\\");
 @import '';
@@ -234,7 +233,7 @@ exports.i(require(\\"-!../../../index.js??ref--4-0!./query.css?foo=1&bar=1\\"),
 exports.i(require(\\"-!../../../index.js??ref--4-0!./other-query.css?foo=1&bar=1#hash\\"), \\"\\");
 
 // module
-exports.push([module.id, \\"@import URL(test.css);\\\\n@import url();\\\\n@import url('');\\\\n@import url(\\\\\\"\\\\\\");\\\\n@import '';\\\\n@import \\\\\\"\\\\\\";\\\\n@import \\\\\\"   \\\\\\";\\\\n@import \\\\\\"\\\\n\\\\\\";\\\\n@import url();\\\\n@import url('');\\\\n@import url(\\\\\\"\\\\\\");\\\\n@import ;\\\\n@import foo-bar;\\\\n@import-normalize;\\\\n@import url('http://') :root {}\\\\n\\\\n.class {\\\\n  a: b c d;\\\\n}\\\\n\\\\n.foo {\\\\n  @import 'path.css';\\\\n}\\\\n\\", \\"\\"]);
+exports.push([module.id, \\"@import url();\\\\n@import url('');\\\\n@import url(\\\\\\"\\\\\\");\\\\n@import '';\\\\n@import \\\\\\"\\\\\\";\\\\n@import \\\\\\"   \\\\\\";\\\\n@import \\\\\\"\\\\n\\\\\\";\\\\n@import url();\\\\n@import url('');\\\\n@import url(\\\\\\"\\\\\\");\\\\n@import ;\\\\n@import foo-bar;\\\\n@import-normalize;\\\\n@import url('http://') :root {}\\\\n\\\\n.class {\\\\n  a: b c d;\\\\n}\\\\n\\\\n.foo {\\\\n  @import 'path.css';\\\\n}\\\\n\\", \\"\\"]);
 
 // exports
 "
@@ -295,9 +294,5 @@ Warning
 Warning
 
 (40:1) It looks like you didn't end your @import statement correctly. Child nodes are attached to it.",
-  "ModuleWarning: Module Warning (from \`replaced original path\`):
-Warning
-
-(5:1) Unable to find uri in '@import URL(test.css)'",
 ]
 `;