Removed singleton in linkify (thread safety)

lib/rules_core/linkify.js

@@ -1,6 +1,6 @@
 // Replace link-like texts with link nodes.
 //
-// Currently restricted to http/https/ftp
+// Currently restricted by `inline.validateLink()` to http/https/ftp
 //
 'use strict';
 
@@ -10,8 +10,20 @@ var Autolinker = require('autolinker');
 
 var LINK_SCAN_RE = /www|\:\/\//;
 
-var links = [];
-var autolinker = new Autolinker({
+
+function isLinkOpen(str) {
+  return /^<a[>\s]/i.test(str);
+}
+function isLinkClose(str) {
+  return /^<\/a\s*>/i.test(str);
+}
+
+// Stupid fabric to avoid singletons, for thread safety.
+// Required for engines like Nashorn.
+//
+function createLinkifier() {
+  var links = [];
+  var autolinker = new Autolinker({
     stripPrefix: false,
     replaceFn: function (autolinker, match) {
       // Only collect matched strings but don't change anything.
@@ -20,19 +32,19 @@ var autolinker = new Autolinker({
       }
       return false;
     }
-});
+  });
 
-function isLinkOpen(str) {
-  return /^<a[>\s]/i.test(str);
-}
-function isLinkClose(str) {
-  return /^<\/a\s*>/i.test(str);
+  return {
+    links: links,
+    autolinker: autolinker
+  };
 }
 
 
 module.exports = function linkify(state) {
   var i, j, l, tokens, token, text, nodes, ln, pos, level, htmlLinkLevel,
-      blockTokens = state.tokens;
+      blockTokens = state.tokens,
+      linkifier = null, links, autolinker;
 
   if (!state.options.linkify) { return; }
 
@@ -69,6 +81,13 @@ module.exports = function linkify(state) {
 
       if (token.type === 'text' && LINK_SCAN_RE.test(token.content)) {
 
+        // Init linkifier in lazy manner, only if required.
+        if (!linkifier) {
+          linkifier = createLinkifier();
+          links = linkifier.links;
+          autolinker = linkifier.autolinker;
+        }
+
         text = token.content;
         links.length = 0;
         autolinker.link(text);