Add uniquifier to footnote IDs

1 files changed, 11 insertions, 2 deletions

diff --git a/lib/document-to-html.js b/lib/document-to-html.js
index bec48b0..d7b6a86 100644
--- a/lib/document-to-html.js
+++ b/lib/document-to-html.js
@@ -31,6 +31,11 @@ function DocumentConversion(options) {
     var footnoteIds = [];
     
     options = options || {};
+    var generateUniquifier = options.generateUniquifier || function() {
+        return Math.floor(Math.random() * 1000000000000000);
+    };
+    var uniquifier = generateUniquifier();
+    
     var defaultParagraphStyle = htmlPaths.topLevelElement("p");
     
     var styleMap = options.styleMap || [];
@@ -128,6 +133,10 @@ function DocumentConversion(options) {
         }).fail(callback);
     }
 
+    function footnoteUid(id) {
+        return uniquifier + "-" + id;
+    }
+
     var elementConverters = {
         "document": function(document, html, messages, callback) {
             convertElements(document.children, html, messages, function(error) {
@@ -173,7 +182,7 @@ function DocumentConversion(options) {
         },
         "footnoteReference": function(element, html, messages, callback) {
             html.open(htmlPaths.element("sup"));
-            html.open(htmlPaths.element("a", {href: "#footnote-" + element.footnoteId}));
+            html.open(htmlPaths.element("a", {href: "#footnote-" + footnoteUid(element.footnoteId)}));
             footnoteIds.push(element.footnoteId);
             html.text("[" + (footnoteNumber++) + "]");
             html.close();
@@ -181,7 +190,7 @@ function DocumentConversion(options) {
             callback();
         },
         "footnote": function(element, html, messages, callback) {
-            html.open(htmlPaths.element("li", {id: "footnote-" + element.id}));
+            html.open(htmlPaths.element("li", {id: "footnote-" + footnoteUid(element.id)}));
             var footnoteHtml = new HtmlGenerator();
             convertElements(element.body, footnoteHtml, messages, function(err) {
                 if (err) {