Do not try to import data: tel: mailto: something: URLs (#50)

* Ignore data URLs

* Add tests

* Ignore tel and mailto URLs

* Hoist  regexes into constants

src/utils/is-url.js

@@ -1,5 +1,11 @@
 const isURL = require('is-url');
 
+// Matches anchor (ie: #raptors)
+const ANCHOR_REGEXP = /^#/;
+
+// Matches scheme (ie: tel:, mailto:, data:)
+const SCHEME_REGEXP = /^[a-z]*\:/i;
+
 module.exports = function (url) {
-  return isURL(url) || /^#/.test(url);
+  return isURL(url) || ANCHOR_REGEXP.test(url) || SCHEME_REGEXP.test(url);
 };

test/css.js

@@ -97,6 +97,10 @@ describe('css', function () {
     assert(/url\("[0-9a-f]+\.woff2"\)/.test(css));
     assert(css.includes('url("http://google.com")'));
     assert(css.includes('.index'));
+    assert(css.includes('url("data:image/gif;base64,quotes")'));
+    assert(css.includes('.quotes'));
+    assert(css.includes('url(data:image/gif;base64,no-quote)'));
+    assert(css.includes('.no-quote'));
 
     assert(fs.existsSync(__dirname + '/dist/' + css.match(/url\("([0-9a-f]+\.woff2)"\)/)[1]));
   });

test/integration/css-url/index.css

@@ -6,3 +6,11 @@
 .index {
   background: url("http://google.com");
 }
+
+.quotes {
+  background: url("data:image/gif;base64,quotes");
+}
+
+.no-quote {
+  background: url(data:image/gif;base64,no-quote);
+}

test/integration/html/index.html

@@ -7,6 +7,8 @@
   <h1>Hello world</h1>
   <p>Linking to <a href="other.html">another page</a></p>
   <a href="#hash_link">Hash link</a>
+  <a href="mailto:someone@acme.com">Mailto link</a>
+  <a href="tel:+33636757575">Tel link</a>
   <script src="index.js"></script>
   <script src="https://unpkg.com/parcel-bundler"></script>
 </body>