move parseJson to its own file

Moves parseJson middleware to its own file. This requires moving the join helper function that is used by parseJson and parseForm to a seperate file as well. This new file is forEachable.js and is to hold utility functions for working with forEachables.

lib/forEachable.js

@@ -0,0 +1,13 @@
+var q = require('./q');
+
+exports.join = function (forEachable) {
+  var body = '';
+
+  function appendChunk(chunk) {
+    body += chunk;
+  };
+
+  return q.when(forEachable.forEach(appendChunk), function () {
+    return body;
+  });
+};

lib/middleware.js

@@ -19,42 +19,14 @@ var middleware = function (handler) {
 
 module.exports = middleware;
 
-function join(forEachable) {
-  var body = '',
-    appendChunk;
-
-  appendChunk = function(chunk) {
-    body += chunk;
-  };
-
-  return when(forEachable.forEach(appendChunk), function success() {
-    return body;
-  });
-}
-
 function deprecate(oldName, newName, fn) {
   return function () {
     console.log(oldName + ' is deprecated, please use ' + newName + ' instead');
     return fn.apply(middleware, Array.prototype.slice.call(arguments));
   }
 }
 
-middleware.parseJson = middleware(function (req, nextApp) {
-  var contentType = req.headers['content-type'];
-
-  if (contentType && req.body) {
-    if (contentType === "application/json") {
-
-      return when(join(req.body), function success(body) {
-        req.body = JSON.parse(body);
-
-        return nextApp(req);
-      });
-    }
-  }
-
-  return nextApp(req);
-});
+middleware.parseJson = require('./middleware/parseJson');
 
 middleware.ParseJson = deprecate('ParseJson', 'parseJson', middleware.parseJson);
 
@@ -69,7 +41,7 @@ middleware.parseForm = middleware.ParseForm = function(nextApp) {
 
       if (contentType === 'application/x-www-form-urlencoded' && req.body) {
 
-        return when(join(req.body), function(body) {
+        return when(require('./forEachable').join(req.body), function(body) {
           req.body = require('querystring').parse(body);
 
           return nextApp(req);

lib/middleware/parseJson.js

@@ -0,0 +1,20 @@
+var middleware = require('../middleware')
+  , forEachable = require('../forEachable')
+  , q = require('../q');
+
+module.exports = middleware(function (req, nextApp) {
+  var contentType = req.headers['content-type'];
+
+  if (contentType && req.body) {
+    if (contentType === 'application/json') {
+
+      return q.when(forEachable.join(req.body), function success(body) {
+        req.body = JSON.parse(body);
+
+        return nextApp(req);
+      });
+    }
+  }
+
+  return nextApp(req);
+});