recognize plain css @imports beginning with //

src/parse/import.rs

@@ -13,6 +13,17 @@ use crate::{
 
 use super::{Parser, Stmt};
 
+fn is_plain_css_import(url: &str) -> bool {
+    if url.len() < 5 {
+        return false;
+    }
+
+    url.ends_with(".css")
+        || url.starts_with("http://")
+        || url.starts_with("https://")
+        || url.starts_with("//")
+}
+
 impl<'a> Parser<'a> {
     /// Searches the current directory of the file then searches in `load_paths` directories
     /// if the import has not yet been found.
@@ -137,7 +148,7 @@ impl<'a> Parser<'a> {
 
         match file_name_as_value {
             Value::String(s, QuoteKind::Quoted) => {
-                if s.ends_with(".css") || s.starts_with("http://") || s.starts_with("https://") {
+                if is_plain_css_import(&s) {
                     Ok(vec![Stmt::Import(format!("\"{}\"", s))])
                 } else {
                     self.parse_single_import(&s, span)

tests/imports.rs

@@ -20,6 +20,8 @@ fn imports_variable() {
 fn import_no_semicolon() {
     let input = "@import \"import_no_semicolon\"\na {\n color: $a;\n}";
     tempfile!("import_no_semicolon", "$a: red;");
+
+    drop(input);
 }
 
 #[test]
@@ -193,6 +195,11 @@ test!(
     "  /**/  @import  /**/  url(foo)  /**/  ;",
     "/**/\n@import url(foo);\n"
 );
+test!(
+    plain_css_begins_with_two_slashes,
+    "@import \"//fonts.googleapis.com/css?family=Droid+Sans\";",
+    "@import \"//fonts.googleapis.com/css?family=Droid+Sans\";\n"
+);
 
 // todo: test for calling paths, e.g. `grass b\index.scss`
 // todo: test for absolute paths (how?)