Fix to ignore footnotes, footnote references

Closes GH-66.

Author: wooorm

lib/contents.js

@@ -9,6 +9,8 @@ var LIST_ITEM = 'listItem'
 var PARAGRAPH = 'paragraph'
 var LINK = 'link'
 var LINK_REFERENCE = 'linkReference'
+var FOOTNOTE = 'footnote'
+var FOOTNOTE_REFERENCE = 'footnoteReference'
 
 // Transform a list of heading objects to a markdown list.
 function contents(map, tight, prefix) {
@@ -107,7 +109,7 @@ function insert(entry, parent, tight, prefix) {
 
 function all(children) {
   var result = []
-  var length = children.length
+  var length = children ? children.length : 0
   var index = -1
 
   while (++index < length) {
@@ -120,7 +122,12 @@ function all(children) {
 function one(node) {
   var copy
 
-  if (node.type === LINK || node.type === LINK_REFERENCE) {
+  if (
+    node.type === LINK ||
+    node.type === LINK_REFERENCE ||
+    node.type === FOOTNOTE ||
+    node.type === FOOTNOTE_REFERENCE
+  ) {
     return all(node.children)
   }
 

test/fixtures/phrasing-content/output.json

@@ -174,13 +174,8 @@
                 "url": "#a-footnote",
                 "children": [
                   {
-                    "type": "footnote",
-                    "children": [
-                      {
-                        "type": "text",
-                        "value": "a footnote"
-                      }
-                    ]
+                    "type": "text",
+                    "value": "a footnote"
                   }
                 ]
               }
@@ -203,11 +198,6 @@
                   {
                     "type": "text",
                     "value": "footnote reference "
-                  },
-                  {
-                    "type": "footnoteReference",
-                    "identifier": "1",
-                    "label": "1"
                   }
                 ]
               }