|
| 1 | +#-- |
| 2 | +# Copyright (c) 2008 Ryan Grove <[email protected]> |
| 3 | +# All rights reserved. |
| 4 | +# |
| 5 | +# Redistribution and use in source and binary forms, with or without |
| 6 | +# modification, are permitted provided that the following conditions are met: |
| 7 | +# |
| 8 | +# * Redistributions of source code must retain the above copyright notice, |
| 9 | +# this list of conditions and the following disclaimer. |
| 10 | +# * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | +# this list of conditions and the following disclaimer in the documentation |
| 12 | +# and/or other materials provided with the distribution. |
| 13 | +# * Neither the name of this project nor the names of its contributors may be |
| 14 | +# used to endorse or promote products derived from this software without |
| 15 | +# specific prior written permission. |
| 16 | +# |
| 17 | +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 18 | +# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | +# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 20 | +# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE |
| 21 | +# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | +# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 23 | +# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 24 | +# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 25 | +# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | +#++ |
| 28 | + |
| 29 | +# = CSSMin |
| 30 | +# |
| 31 | +# Minifies CSS using a fast, safe routine adapted from Julien Lecomte's YUI |
| 32 | +# Compressor, which was in turn adapted from Isaac Schlueter's cssmin PHP |
| 33 | +# script. |
| 34 | +# |
| 35 | +# Author:: Ryan Grove (mailto:[email protected]) |
| 36 | +# Version:: 1.0.2 (2008-08-23) |
| 37 | +# Copyright:: Copyright (c) 2008 Ryan Grove. All rights reserved. |
| 38 | +# License:: New BSD License (http://opensource.org/licenses/bsd-license.php) |
| 39 | +# Website:: http://github.com/rgrove/cssmin/ |
| 40 | +# |
| 41 | +# == Example |
| 42 | +# |
| 43 | +# require 'rubygems' |
| 44 | +# require 'cssmin' |
| 45 | +# |
| 46 | +# File.open('example.css', 'r') {|file| puts CSSMin.minify(file) } |
| 47 | +# |
| 48 | +module CSSMin |
| 49 | + |
| 50 | + # Reads CSS from +input+ (which can be a String or an IO object) and |
| 51 | + # returns a String containing minified CSS. |
| 52 | + def self.minify(input) |
| 53 | + css = input.is_a?(IO) ? input.read : input.dup.to_s |
| 54 | + |
| 55 | + # Remove comments. |
| 56 | + css.gsub!(/\/\*[\s\S]*?\*\//, '') |
| 57 | + |
| 58 | + # Compress all runs of whitespace to a single space to make things easier |
| 59 | + # to work with. |
| 60 | + css.gsub!(/\s+/, ' ') |
| 61 | + |
| 62 | + # Replace box model hacks with placeholders. |
| 63 | + css.gsub!(/"\\"\}\\""/, '___BMH___') |
| 64 | + |
| 65 | + # Remove unnecessary spaces, but be careful not to turn "p :link {...}" |
| 66 | + # into "p:link{...}". |
| 67 | + css.gsub!(/(?:^|\})[^\{:]+\s+:+[^\{]*\{/) do |match| |
| 68 | + match.gsub(':', '___PSEUDOCLASSCOLON___') |
| 69 | + end |
| 70 | + css.gsub!(/\s+([!\{\};:>+\(\)\],])/, '\1') |
| 71 | + css.gsub!('___PSEUDOCLASSCOLON___', ':') |
| 72 | + css.gsub!(/([!\{\}:;>+\(\[,])\s+/, '\1') |
| 73 | + |
| 74 | + # Add missing semicolons. |
| 75 | + css.gsub!(/([^;\}])\}/, '\1;}') |
| 76 | + |
| 77 | + # Replace 0(%, em, ex, px, in, cm, mm, pt, pc) with just 0. |
| 78 | + css.gsub!(/([\s:])([+-]?0)(?:%|em|ex|px|in|cm|mm|pt|pc)/i, '\1\2') |
| 79 | + |
| 80 | + # Replace 0 0 0 0; with 0. |
| 81 | + css.gsub!(/:(?:0 )+0;/, ':0;') |
| 82 | + |
| 83 | + # Replace background-position:0; with background-position:0 0; |
| 84 | + css.gsub!('background-position:0;', 'background-position:0 0;') |
| 85 | + |
| 86 | + # Replace 0.6 with .6, but only when preceded by : or a space. |
| 87 | + css.gsub!(/(:|\s)0+\.(\d+)/, '\1.\2') |
| 88 | + |
| 89 | + # Convert rgb color values to hex values. |
| 90 | + css.gsub!(/rgb\s*\(\s*([0-9,\s]+)\s*\)/) do |match| |
| 91 | + '#' << $1.scan(/\d+/).map{|n| n.to_i.to_s(16).rjust(2, '0') }.join |
| 92 | + end |
| 93 | + |
| 94 | + # Compress color hex values, making sure not to touch values used in IE |
| 95 | + # filters, since they would break. |
| 96 | + css.gsub!(/([^"'=\s])(\s?)\s*#([0-9a-f])\3([0-9a-f])\4([0-9a-f])\5/i, '\1\2#\3\4\5') |
| 97 | + |
| 98 | + # Remove empty rules. |
| 99 | + css.gsub!(/[^\}]+\{;\}\n/, '') |
| 100 | + |
| 101 | + # Re-insert box model hacks. |
| 102 | + css.gsub!('___BMH___', '"\"}\""') |
| 103 | + |
| 104 | + # Prevent redundant semicolons. |
| 105 | + css.gsub!(/;;+/, ';') |
| 106 | + |
| 107 | + css.strip |
| 108 | + end |
| 109 | + |
| 110 | +end |
| 111 | + |
| 112 | + |
| 113 | +# Wraps CSSMin compressor to use the same API as the rest of |
| 114 | +# Jammit's compressors. |
| 115 | +class Jammit::CssminCompressor |
| 116 | + def initialize(options = {}) |
| 117 | + end |
| 118 | + |
| 119 | + def compress(css) |
| 120 | + CSSMin.minify(css) |
| 121 | + end |
| 122 | +end |
0 commit comments