added --self to easily get a browser-runnable version of UglifyJS

lib/ast.js

@@ -248,7 +248,46 @@ var AST_Scope = DEFNODE("Scope", "directives variables functions uses_with uses_
 }, AST_Block);
 
 var AST_Toplevel = DEFNODE("Toplevel", "globals", {
-    $documentation: "The toplevel scope"
+    $documentation: "The toplevel scope",
+    wrap_commonjs: function(name, export_all) {
+        var self = this;
+        if (export_all) {
+            self.figure_out_scope();
+            var to_export = [];
+            self.walk(new TreeWalker(function(node){
+                if (node instanceof AST_SymbolDeclaration && node.definition().global) {
+                    to_export.push(node.name);
+                }
+            }));
+        }
+        var wrapped_tl = "(function(exports, global){ global['" + name + "'] = exports; '$ORIG'; '$EXPORTS'; }({}, (function(){return this}())))";
+        wrapped_tl = parse(wrapped_tl);
+        wrapped_tl = wrapped_tl.transform(new TreeTransformer(function before(node){
+            if (node instanceof AST_SimpleStatement) {
+                node = node.body;
+                if (node instanceof AST_String) switch (node.getValue()) {
+                  case "$ORIG":
+                    return new AST_BlockStatement(self);
+                  case "$EXPORTS":
+                    var body = [];
+                    to_export.forEach(function(name){
+                        body.push(new AST_SimpleStatement({
+                            body: new AST_Assign({
+                                left: new AST_Sub({
+                                    expression: new AST_SymbolRef({ name: "exports" }),
+                                    property: new AST_String({ value: name }),
+                                }),
+                                operator: "=",
+                                right: new AST_SymbolRef({ name: name }),
+                            }),
+                        }));
+                    });
+                    return new AST_BlockStatement({ body: body });
+                }
+            }
+        }));
+        return wrapped_tl;
+    }
 }, AST_Scope);
 
 var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments", {