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Javascript Minifier

rJSmin is a javascript minifier written in python.

The minifier is based on the semantics of jsmin.c by Douglas Crockford_.

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.

Supported python versions are 2.7 and 3.6+.

.. _jsmin.c by Douglas Crockford: http://www.crockford.com/javascript/jsmin.c

Copyright and License


Copyright 2011 - 2025
André Malo or his licensors, as applicable.

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>.


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

.. vim:tw=72 syntax=rest

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