Add reference property on full references when different from identif…

packages/remark-parse/lib/tokenize/reference.js

@@ -191,6 +191,10 @@ function reference(eat, value, silent) {
   };
 
   if (type === T_LINK || type === T_IMAGE) {
+    if (referenceType === 'full' && node.identifier !== identifier) {
+      node.reference = identifier;
+    }
+
     node.referenceType = referenceType;
   }
 

packages/remark-stringify/lib/util/label.js

@@ -10,7 +10,7 @@ module.exports = label;
  * changes. */
 function label(node) {
   var type = node.referenceType;
-  var value = type === 'full' ? node.identifier : '';
+  var value = type === 'full' ? (node.reference || node.identifier) : '';
 
   return type === 'shortcut' ? value : '[' + value + ']';
 }

test/fixtures/tree/links-reference-proto.json

@@ -24,6 +24,7 @@
         {
           "type": "linkReference",
           "identifier": "tostring",
+          "reference": "toString",
           "referenceType": "full",
           "children": [
             {

test/remark-stringify.js

@@ -255,6 +255,30 @@ test('remark().stringify(ast, file)', function (t) {
     });
   });
 
+  t.test('undefined references should fallback to original', function (st) {
+    /* Data-driven tests in the format: [name, input, expected] */
+    var tests = [
+      ['capitalized link references - full', '[alpha][Bravo]'],
+      ['capitalized link references - collapsed', '[Bravo][]'],
+      ['capitalized link references - shortcut', '[Bravo]'],
+      ['capitalized image references - full', '![alpha][Bravo]'],
+      ['capitalized image references - collapsed', '![Bravo][]'],
+      ['capitalized image references - shortcut', '![Bravo]'],
+      ['capitalized footnote references', '[^Alpha]']
+    ];
+
+    st.plan(tests.length);
+    tests.forEach(function (test) {
+      st.equal(
+        remark()
+          .processSync(test[1])
+          .toString(),
+        test[1] + '\n',
+        test[0]
+      );
+    });
+  });
+
   t.test('should support `stringLength`', function (st) {
     st.plan(2);