Fixed RegExp literal in mozilla AST generation/output and added a --dump-spidermonkey-ast flag

bin/uglifyjs

@@ -73,6 +73,7 @@ You need to pass an argument to this option to specify the name that your module
     .describe("mangle-regex", "Only mangle property names matching the regex")
     .describe("name-cache", "File to hold mangled names mappings")
     .describe("pure-funcs", "List of functions that can be safely removed if their return value is not used")
+    .describe("dump-spidermonkey-ast", "Dump SpiderMonkey AST to stdout.")
 
     .alias("p", "prefix")
     .alias("o", "output")
@@ -117,6 +118,7 @@ You need to pass an argument to this option to specify the name that your module
     .boolean("stats")
     .boolean("acorn")
     .boolean("spidermonkey")
+    .boolean("dump-spidermonkey-ast")
     .boolean("lint")
     .boolean("V")
     .boolean("version")
@@ -444,6 +446,9 @@ async.eachLimit(files, 1, function (file, cb) {
         }
     }
 
+    if (ARGS.dump_spidermonkey_ast) {
+        print(JSON.stringify(TOPLEVEL.to_mozilla_ast(), null, 2));
+    } else {
         time_it("generate", function(){
             TOPLEVEL.print(output);
         });
@@ -465,6 +470,7 @@ async.eachLimit(files, 1, function (file, cb) {
         } else {
             print(output);
         }
+    }
 
     if (ARGS.stats) {
         print_error(UglifyJS.string_template("Timing information (compressed {count} files):", {

lib/mozilla-ast.js

@@ -146,7 +146,7 @@
               case "boolean":
                 return new (val ? AST_True : AST_False)(args);
               default:
-                args.value = val;
+                args.value = M.regex && M.raw ? M.raw : val;
                 return new AST_RegExp(args);
             }
         },
@@ -334,6 +334,19 @@
         };
     });
 
+    def_to_moz(AST_RegExp, function To_Moz_Literal(M) {
+        var value = M.value;
+        return {
+            type: "Literal",
+            value: value,
+            raw: value.toString(),
+            regex: {
+                pattern: value.source,
+                flags: value.toString().match(/[gimuy]*$/)[0]
+            }
+        };
+    });
+
     def_to_moz(AST_Constant, function To_Moz_Literal(M) {
         var value = M.value;
         if (typeof value === 'number' && (value < 0 || (value === 0 && 1 / value < 0))) {