1============== 2 CSS Minifier 3============== 4 5RCSSmin is a CSS minifier. 6 7The minifier is based on the semantics of the `YUI compressor`_\, which itself 8is based on `the rule list by Isaac Schlueter`_\. 9 10This module is a re-implementation aiming for speed instead of maximum 11compression, so it can be used at runtime (rather than during a preprocessing 12step). RCSSmin does syntactical compression only (removing spaces, comments 13and possibly semicolons). It does not provide semantic compression (like 14removing empty blocks, collapsing redundant properties etc). It does, however, 15support various CSS hacks (by keeping them working as intended). 16 17Here's a feature list: 18 19- Strings are kept, except that escaped newlines are stripped 20- Space/Comments before the very end or before various characters are 21 stripped: ``:{});=>+],!`` (The colon (``:``) is a special case, a single 22 space is kept if it's outside a ruleset.) 23- Space/Comments at the very beginning or after various characters are 24 stripped: ``{}(=:>+[,!`` 25- Optional space after unicode escapes is kept, resp. replaced by a simple 26 space 27- whitespaces inside ``url()`` definitions are stripped 28- Comments starting with an exclamation mark (``!``) can be kept optionally. 29- All other comments and/or whitespace characters are replaced by a single 30 space. 31- Multiple consecutive semicolons are reduced to one 32- The last semicolon within a ruleset is stripped 33- CSS Hacks supported: 34 35 - IE7 hack (``>/**/``) 36 - Mac-IE5 hack (``/*\*/.../**/``) 37 - The boxmodelhack is supported naturally because it relies on valid CSS2 38 strings 39 - Between ``:first-line`` and the following comma or curly brace a space is 40 inserted. (apparently it's needed for IE6) 41 - Same for ``:first-letter`` 42 43rcssmin.c is a reimplementation of rcssmin.py in C and improves runtime up to 44factor 100 or so (depending on the input). docs/BENCHMARKS in the source 45distribution contains the details. 46 47Both python 2 (>= 2.4) and python 3 are supported. 48 49.. _YUI compressor: https://github.com/yui/yuicompressor/ 50 51.. _the rule list by Isaac Schlueter: https://github.com/isaacs/cssmin/ 52 53 54Copyright and License 55~~~~~~~~~~~~~~~~~~~~~ 56 57Copyright 2011 - 2014 58André Malo or his licensors, as applicable. 59 60The whole package (except for the files in the bench/ directory) is 61distributed under the Apache License Version 2.0. You'll find a copy in the 62root directory of the distribution or online at: 63<http://www.apache.org/licenses/LICENSE-2.0>. 64 65 66Bugs 67~~~~ 68 69No bugs, of course. ;-) 70But if you've found one or have an idea how to improve rcssmin, feel free 71to send a pull request on `github <https://github.com/ndparker/rcssmin>`_ 72or send a mail to <rcssmin-bugs@perlig.de>. 73 74 75Author Information 76~~~~~~~~~~~~~~~~~~ 77 78André "nd" Malo <nd perlig.de> 79GPG: 0x8103A37E 80 81 82 If God intended people to be naked, they would be born that way. 83 -- Oscar Wilde 84 85.. vim:tw=72 syntax=rest 86