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rjsmin

★ 74 Open GitHub ↗

Fast javascript minifier for Python

// repository documentation

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# rJSmin - A Javascript Minifier For Python

TABLE OF CONTENTS
-----------------

1. Introduction
1. Copyright and License
1. System Requirements
1. Installation
1. Documentation
1. Bugs
1. Author Information

## INTRODUCTION

rJSmin is a javascript minifier written in python.

The minifier is based on the semantics of [jsmin.c by Douglas
Crockford](http://www.crockford.com/javascript/jsmin.c).

The module is a re-implementation aiming for speed, so it can be used at
runtime (rather than during a preprocessing step). Usually it produces the
same results as the original ``jsmin.c``. It differs in the following ways:

- there is no error detection: unterminated string, regex and comment
  literals are treated as regular javascript code and minified as such.
- Control characters inside string and regex literals are left untouched; they
  are not converted to spaces (nor to \\n)
- Newline characters are not allowed inside string and regex literals, except
  for line continuations in string literals (ECMA-5).
- "return /regex/" is recognized correctly.
- More characters are allowed before regexes.
- Line terminators after regex literals are handled more sensibly
- "+ +" and "- -" sequences are not collapsed to '++' or '--'
- Newlines before ! operators are removed more sensibly
- (Unnested) template literals are supported (ECMA-6)
- Comments starting with an exclamation mark (``!``) can be kept optionally
- rJSmin does not handle streams, but only complete strings. (However, the
  module provides a "streamy" interface).

Since most parts of the logic are handled by the regex engine it's way faster
than the original python port of ``jsmin.c`` by Baruch Even. The speed factor
varies between about 6 and 55 depending on input and python version (it gets
faster the more compressed the input already is).  Compared to the
speed-refactored python port by Dave St.Germain the performance gain is less
dramatic but still between 3 and 50 (for huge inputs). See the docs/BENCHMARKS
file for details.

rjsmin.c is a reimplementation of rjsmin.py in C and speeds it up even more.

* [Change Log](CHANGES)
* [Development](docs/DEVELOPMENT.md)

## COPYRIGHT AND LICENSE

The whole package (except for the files in the bench/ directory)
is distributed under the Apache License Version 2.0. You'll find a copy in the
root directory of the distribution or online at:
<http://www.apache.org/licenses/LICENSE-2.0>.

## SYSTEM REQUIREMENTS

Supported python versions are 2.7 and 3.6+.

You also need a build environment for python C extensions (i.e. a compiler
and the python development files).

## INSTALLATION

### Using pip

```
$ pip install rjsmin
```

### Using distutils

Download the package, unpack it, change into the directory

```
$ python setup.py install
```

The command above will install a new "rjsmin" package into python's
library path.

### Drop-in

rJSmin effectively consists of two files: rjsmin.py and rjsmin.c, the
latter being entirely optional. So, for simple integration you can just
copy rjsmin.py into your project and use it.

## DOCUMENTATION

The module provides a simple function, called jsmin which takes the script as
a string and returns the minified script as a string.

The module additionally provides a "streamy" interface similar to the one
jsmin.c provides:

```
$ python -mrjsmin <script >minified
```

It takes two options:

-b  Keep bang-comments (Comments starting with an exclamation mark)
  -p  Force using the python implementation (not the C implementation)

The latest documentation is also available online at
<http://opensource.perlig.de/rjsmin/>.

## BUGS

No bugs, of course. ;-)
But if you've found one or have an idea how to improve rjsmin, feel free
to send a pull request on [github](https://github.com/ndparker/rjsmin)
or send a mail to <rjsmin-bugs@perlig.de>.

## AUTHOR INFORMATION

André "nd" Malo <nd@perlig.de>, GPG: 0x029C942244325167

>  If God intended people to be naked, they would be born that way.
>                                                   -- Oscar Wilde

rjsmin

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