Squashed 'thirdparty/systemjs/' content from commit 5ed69b6

git-subtree-dir: thirdparty/systemjs
git-subtree-split: 5ed69b6344e8fc1cd43bf758350b2236f57e1499

1 files changed, 43 insertions, 0 deletions

diff --git a/lib/cjs-helpers.js b/lib/cjs-helpers.js
new file mode 100644
index 000000000..0ae08d612
--- /dev/null
+++ b/lib/cjs-helpers.js
@@ -0,0 +1,43 @@
+hookConstructor(function(constructor) {
+  return function() {
+    var loader = this;
+    constructor.call(loader);
+
+    if (typeof window != 'undefined' && typeof document != 'undefined' && window.location)
+      var windowOrigin = location.protocol + '//' + location.hostname + (location.port ? ':' + location.port : '');
+
+    function stripOrigin(path) {
+      if (path.substr(0, 8) == 'file:///')
+        return path.substr(7 + !!isWindows);
+      
+      if (windowOrigin && path.substr(0, windowOrigin.length) == windowOrigin)
+        return path.substr(windowOrigin.length);
+
+      return path;
+    }
+
+    loader.set('@@cjs-helpers', loader.newModule({
+      requireResolve: function(request, parentId) {
+        return stripOrigin(loader.normalizeSync(request, parentId));
+      },
+      getPathVars: function(moduleId) {
+        // remove any plugin syntax
+        var pluginIndex = moduleId.lastIndexOf('!');
+        var filename;
+        if (pluginIndex != -1)
+          filename = moduleId.substr(0, pluginIndex);
+        else
+          filename = moduleId;
+
+        var dirname = filename.split('/');
+        dirname.pop();
+        dirname = dirname.join('/');
+
+        return {
+          filename: stripOrigin(filename),
+          dirname: stripOrigin(dirname)
+        };
+      }
+    }))
+  };
+});
\ No newline at end of file