Fix to support spaces inside marker if it has no attributes

Closes GH-2.

Author: izumin5210

index.js

@@ -6,6 +6,9 @@ module.exports = marker;
 /* HTML type. */
 var T_HTML = 'html';
 
+/* Expression for eliminating extra spaces */
+var SPACES = /\s+/g;
+
 /* Expression for parsing parameters. */
 var PARAMETERS = new RegExp(
   '\\s+' +
@@ -112,5 +115,5 @@ function parameters(value) {
     return '';
   });
 
-  return rest ? null : attributes;
+  return rest.replace(SPACES, '') ? null : attributes;
 }

package.json

@@ -13,7 +13,8 @@
   "bugs": "https://github.com/syntax-tree/mdast-comment-marker/issues",
   "author": "Titus Wormer <[email protected]> (http://wooorm.com)",
   "contributors": [
-    "Titus Wormer <[email protected]> (http://wooorm.com)"
+    "Titus Wormer <[email protected]> (http://wooorm.com)",
+    "Masayuki Izumi <[email protected]> (http://izumin.info)"
   ],
   "files": [
     "index.js"

test.js

@@ -62,6 +62,22 @@ test('normalize(value, allowApostrophes)', function (t) {
     'marker without attributes'
   );
 
+  node = {
+    type: 'html',
+    value: '<!-- foo -->'
+  };
+
+  t.deepEqual(
+    marker(node),
+    {
+      name: 'foo',
+      attributes: '',
+      parameters: {},
+      node: node
+    },
+    'marker without attributes ignoring spaces'
+  );
+
   node = {
     type: 'html',
     value: '<!--foo bar-->'