From a0563ab7ce204cf82feb56259d7a52c0b84077b7 Mon Sep 17 00:00:00 2001
From: Paul Joseph Davis <davisp@apache.org>
Date: Wed, 11 May 2011 18:50:41 +0000
Subject: Fix circular imports in CommonJS modules.

Backport of 1102006 from trunk.



git-svn-id: https://svn.apache.org/repos/asf/couchdb/branches/1.1.x@1102017 13f79535-47bb-0310-9956-ffa450edef68
---
 share/server/util.js | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

(limited to 'share/server/util.js')

diff --git a/share/server/util.js b/share/server/util.js
index b55480b9..e4386701 100644
--- a/share/server/util.js
+++ b/share/server/util.js
@@ -31,16 +31,16 @@ var resolveModule = function(names, mod, root) {
     }
     return resolveModule(names, {
       id : mod.id.slice(0, mod.id.lastIndexOf('/')),
-      parent : mod.parent.parent.parent,
-      current : mod.parent.parent.current
+      parent : mod.parent.parent,
+      current : mod.parent.current
     });
   } else if (n == '.') {
     if (!mod.parent) {
       throw ["error", "invalid_require_path", 'Object has no parent '+JSON.stringify(mod.current)];
     }
     return resolveModule(names, {
-      parent : mod.parent.parent,
-      current : mod.parent.current,
+      parent : mod.parent,
+      current : mod.current,
       id : mod.id
     });
   } else if (root) {
@@ -66,17 +66,28 @@ var Couch = {
     try {
       if (sandbox) {
         if (ddoc) {
+          if (!ddoc._module_cache) {
+            ddoc._module_cache = {};
+          }
           var require = function(name, module) {
             module = module || {};
-            var newModule = resolveModule(name.split('/'), module, ddoc);
-            var s = "function (module, exports, require) { " + newModule.current + " }";
-            try {
-              var func = sandbox ? evalcx(s, sandbox) : eval(s);
-              func.apply(sandbox, [newModule, newModule.exports, function(name) {return require(name, newModule)}]);
-            } catch(e) { 
-              throw ["error","compilation_error","Module require('"+name+"') raised error "+e.toSource()]; 
+            var newModule = resolveModule(name.split('/'), module.parent, ddoc);
+            if (!ddoc._module_cache.hasOwnProperty(newModule.id)) {
+              // create empty exports object before executing the module,
+              // stops circular requires from filling the stack
+              ddoc._module_cache[newModule.id] = {};
+              var s = "function (module, exports, require) { " + newModule.current + " }";
+              try {
+                var func = sandbox ? evalcx(s, sandbox) : eval(s);
+                func.apply(sandbox, [newModule, newModule.exports, function(name) {
+                  return require(name, newModule);
+                }]);
+              } catch(e) { 
+                throw ["error","compilation_error","Module require('"+name+"') raised error "+e.toSource()]; 
+              }
+              ddoc._module_cache[newModule.id] = newModule.exports;
             }
-            return newModule.exports;
+            return ddoc._module_cache[newModule.id];
           }
           sandbox.require = require;
         }
-- 
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