From e391367488c8f7bfc5890e1fa51f4ad6e6f28a5f Mon Sep 17 00:00:00 2001 From: Ingvar Stepanyan Date: Mon, 4 Aug 2014 20:48:14 +0300 Subject: [PATCH] Added example for usage with SpiderMonkey AST. --- README.md | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/README.md b/README.md index 27d06cd6..c60a124d 100644 --- a/README.md +++ b/README.md @@ -400,6 +400,38 @@ Acorn is really fast (e.g. 250ms instead of 380ms on some 650K code), but converting the SpiderMonkey tree that Acorn produces takes another 150ms so in total it's a bit more than just using UglifyJS's own parser. +### Using UglifyJS to transform SpiderMonkey AST + +Now you can use UglifyJS as any other intermediate tool for transforming +JavaScript ASTs in SpiderMonkey format. + +Example: + +```javascript +function uglify(ast, options, mangle) { + // Conversion from SpiderMonkey AST to internal format + var uAST = UglifyJS.AST_Node.from_mozilla_ast(ast); + + // Compression + uAST.figure_out_scope(); + uAST = uAST.transform(UglifyJS.Compressor(options)); + + // Mangling (optional) + if (mangle) { + uAST.figure_out_scope(); + uAST.compute_char_frequency(); + uAST.mangle_names(); + } + + // Back-conversion to SpiderMonkey AST + return uAST.to_mozilla_ast(); +} +``` + +Check out +[original blog post](http://rreverser.com/using-mozilla-ast-with-uglifyjs/) +for details. + API Reference ------------- -- 2.34.1