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cssmin.rb
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cssmin.rb
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# ===========================================================================
# Project: Abbot - SproutCore Build Tools
# Copyright: ©2009 Apple Inc.
# portions copyright @2006-2009 Sprout Systems, Inc.
# and contributors
# ===========================================================================
# module and class name have been modified
#
# == MIT License
# See http://code.google.com/p/rainpress/
#
# == About
#
# Rainpress is a compressor for CSS. It's written in ruby, but should not be
# limited to ruby projects.
#
# Rainpress does not apply common compression algorithms like gzip, it removes
# unnecessary characters and replaces some attributes with a shorter equivalent
# name.
#
# == Links
#
# * {Rainpress Website}[http://rainpress.xhochy.com/]
# * {SVN repository}[http://code.google.com/p/rainpress/source]
# * {Bugtracker}[https://bugs.launchpad.net/rainpress/]
# * {Wiki}[http://code.google.com/p/rainpress/w/list]
# * {Translations}[https://translations.launchpad.net/rainpress/]
# * {XhochY Weblog (for Announcements about Rainpress)}[http://xhochy.org/en/]
# * {Mailinglist}[http://groups.google.com/group/xy-oss-projects-discussion]
# * {Continous Integration Builds and Tests}[http://cruisecontrol-rb.xhochy.com/builds/rainpress]
# * {Freshmeat Record}[http://freshmeat.net/projects/rainpress]
module SC::Helpers
# == Information
#
# This is the main class of Rainpress, create an instance of it to compress
# your CSS-styles.
#
# == Simple Usage
#
# packer = SproutCore::CSSPacker.new
# compressed_style = packer.compress(style)
class CSSPacker
# Use always this functions if you want to compress your CSS-style
#
# <b>Options:</b>
#
# * <tt>:preserveComments</tt> - if set to true, comments will not be
# removed
# * <tt>:preserveNewline</tt> - if set to true, newlines will not be removed
# * <tt>:preserveSpaces</tt> - if set to true, spaces will not be removed
# * <tt>:preserveColors</tt> - if set to true, colors will not be modified
# * <tt>:skipMisc</tt> - if set to true, miscellaneous compression parts
# will be skipped
def compress(style, options = {})
# remove comments
style = remove_comments(style) unless options[:preserveComments]
# remove newlines
style = remove_newlines(style) unless options[:preserveNewlines]
# remove unneeded spaces
style = remove_spaces(style) unless options[:preserveSpaces]
# replace colours with shorter names
style = shorten_colors(style) unless options[:preserveColors]
# make all other things
style = do_misc(style) unless options[:skipMisc]
style
end
# Remove all comments out of the CSS-Document
def remove_comments(script)
input = script
script = ''
while input.length > 0 do
pos = input.index("/*");
# No more comments
if pos == nil
script += input
input = '';
else # Comment beginning at pos
script += input[0..(pos-1)] if pos > 0 # only append text if there is some
input = input[(pos+2)..-1]
# Comment ending at pos
pos = input.index("*/")
input = input[(pos+2)..-1]
end
end
# return
script
end
# Remove all newline characters
def remove_newlines(script)
script.gsub(/\n|\r/,'')
end
# 1. Turn mutiple spaces into a single
# 2. Remove spaces around ;:{},
# 3. Remove tabs
def remove_spaces(script)
script = script.gsub(/(\s(\s)+)/, ' ')
script = script.gsub(/\s*;\s*/,';')
script = script.gsub(/\s*:\s*/,':')
script = script.gsub(/\s*\{\s*/,'{')
script = script.gsub(/\s*\}\s*/,'}')
script = script.gsub(/\s*,\s*/,',')
script.gsub("\t",'');
end
# Replace color values with their shorter equivalent
#
# 1. Turn rgb(,,)-colors into #-values
# 2. Shorten #AABBCC down to #ABC
# 3. Replace names with their shorter hex-equivalent
# * white -> #fff
# * black -> #000
# 4. Replace #-values with their shorter name
# * #f00 -> red
def shorten_colors(style)
# rgb(50,101,152) to #326598
style = style.gsub(/rgb\s*\(\s*([0-9,\s]+)\s*\)/) do |match|
out = '#'
$1.split(',').each do |num|
if num.to_i < 16
out += '0'
end
out += num.to_i.to_s(16) # convert to hex
end
out
end
# #AABBCC to #ABC, keep if preceed by a '='
style = style.gsub(/([^\"'=\s])(\s*)#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])/) do |match|
out = match
if ($3.downcase == $4.downcase) and ($5.downcase == $6.downcase) and ($7.downcase == $8.downcase)
out = $1 + '#' + $3.downcase + $5.downcase + $7.downcase
end
out
end
# shorten several names to numbers
style = style.gsub(/:[\s]*white[\s]*;/, ':#fff;')
style = style.gsub(/:[\s]*white[\s]*\}/, ':#fff}')
style = style.gsub(/:[\s]*black[\s]*;/, ':#000;')
style = style.gsub(/:[\s]*black[\s]*\}/, ':#000}')
# shotern several numbers to names
style = style.gsub(/:[\s]*#([fF]00|[fF]{2}0000);/, ':red;')
style = style.gsub(/:[\s]*#([fF]00|[fF]{2}0000)\}/, ':red}')
style
end
# Do miscellaneous compression methods on the style
def do_misc(script)
# Replace 0(pt,px,em,%) with 0 but only when preceded by : or a white-space
script = script.gsub(/([\s:]+)(0)(px|em|%|in|cm|mm|pc|pt|ex)/) do |match|
match.gsub(/(px|em|%|in|cm|mm|pc|pt|ex)/,'')
end
# Replace 0 0 0 0; with 0.
script = script.gsub(':0 0 0 0;', ':0;')
script = script.gsub(':0 0 0 0}', ':0}')
script = script.gsub(':0 0 0;', ':0;')
script = script.gsub(':0 0 0}', ':0}')
script = script.gsub(':0 0}', ':0}')
script = script.gsub(':0 0;', ':0;')
# Replace background-position:0; with background-position:0 0;
script = script.gsub('background-position:0;', 'background-position:0 0;');
# Replace 0.6 to .6, but only when preceded by : or a white-space
script = script.gsub(/[:\s]0+\.(\d+)/) do |match|
match.sub('0', '') # only first '0' !!
end
# Replace ;;;; with ;
script = script.gsub(/[;]+/, ';')
# Replace ;} with }
script = script.gsub(';}', '}')
# Replace background-color: with background:
script = script.gsub('background-color:', 'background:')
# Replace font-weight:normal; with 400, bold with 700
script = script.gsub(/font-weight[\s]*:[\s]*normal[\s]*;/,'font-weight:400;')
script = script.gsub(/font-weight[\s]*:[\s]*normal[\s]*\}/,'font-weight:400}')
script = script.gsub(/font[\s]*:[\s]*normal[\s;\}]*/) do |match|
match.sub('normal', '400')
end
script = script.gsub(/font-weight[\s]*:[\s]*bold[\s]*;/,'font-weight:700;')
script = script.gsub(/font-weight[\s]*:[\s]*bold[\s]*\}/,'font-weight:700}')
script = script.gsub(/font[\s]*:[\s]*bold[\s;\}]*/) do |match|
match.sub('bold', '700')
end
script
end
end
end