class Rainpress
Information¶ ↑
This is the main class of Rainpress
, create an instance of it to compress your CSS-styles.
- Author
-
Uwe L. Korn <uwelk@xhochy.org>
Options:
-
:comments
- if set to false, comments will not be removed -
:newlines
- if set to false, newlines will not be removed -
:spaces
- if set to false, spaces will not be removed -
:colors
- if set to false, colors will not be modified -
:misc
- if set to false, miscellaneous compression parts will be skipped
Public Class Methods
Quick-compress the styles. This eliminates the need to create an instance of the class
# File lib/smurf/rainpress.rb, line 18 def self.compress(style, options = {}) self.new(style, options).compress! end
# File lib/smurf/rainpress.rb, line 22 def initialize(style, opts = {}) @style = style @opts = { :comments => true, :newlines => true, :spaces => true, :colors => true, :misc => true } @opts.merge! opts end
Public Instance Methods
Run the compressions and return the newly compressed text
# File lib/smurf/rainpress.rb, line 35 def compress! remove_comments! if @opts[:comments] remove_newlines! if @opts[:newlines] remove_spaces! if @opts[:spaces] shorten_colors! if @opts[:colors] do_misc! if @opts[:misc] @style end
Do miscellaneous compression methods on the style.
# File lib/smurf/rainpress.rb, line 128 def do_misc! # Replace 0(pt,px,em,%) with 0 but only when preceded by : or a white-space @style.gsub! /([\s:]+)(0)(px|em|%|in|cm|mm|pc|pt|ex)/i, '\1\2' # Replace :0 0 0 0(;|}) with :0(;|}) @style.gsub! /:0 0 0 0(;|\})/, ':0\1' # Replace :0 0 0(;|}) with :0(;|}) @style.gsub! /:0 0 0(;|\})/, ':0\1' # Replace :0 0(;|}) with :0(;|}) @style.gsub! /:0 0(;|\})/, ':0\1' # Replace background-position:0; with background-position:0 0; @style.gsub! 'background-position:0;', 'background-position:0 0;' # Replace 0.6 to .6, but only when preceded by : or a white-space @style.gsub! /[:\s]0+\.(\d+)/ do |match| match.sub '0', '' # only first '0' !! end # Replace multiple ';' with a single ';' @style.gsub! /[;]+/, ';' # Replace ;} with } @style.gsub! ';}', '}' # Replace font-weight:normal; with 400 @style.gsub! /font-weight[\s]*:[\s]*normal[\s]*(;|\})/i,'font-weight:400\1' @style.gsub! /font[\s]*:[\s]*normal[\s;\}]*/ do |match| match.sub 'normal', '400' end # Replace font-weight:bold; with 700 @style.gsub! /font-weight[\s]*:[\s]*bold[\s]*(;|\})/,'font-weight:700\1' @style.gsub! /font[\s]*:[\s]*bold[\s;\}]*/ do |match| match.sub 'bold', '700' end end
Remove all comments out of the CSS-Document
Only /* text */ comments are supported. Attention: If you are doing css hacks for IE using the comment tricks, they will be removed using this function. Please consider for IE css style corrections the usage of conditionals comments in your (X)HTML document.
# File lib/smurf/rainpress.rb, line 50 def remove_comments! input = @style @style = '' while input.length > 0 do pos = input.index("/*"); # No more comments if pos == nil @style += input input = ''; else # Comment beginning at pos @style += 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 end
Remove all newline characters
We take care of Windows(rn), Unix(n) and Mac(r) newlines.
# File lib/smurf/rainpress.rb, line 74 def remove_newlines! @style.gsub! /\n|\r/, '' end
Remove unneeded spaces
-
Turn mutiple spaces into a single
-
Remove spaces around ;:{},
-
Remove tabs
# File lib/smurf/rainpress.rb, line 83 def remove_spaces! @style.gsub! /\s*(\s|;|:|\}|\{|,)\s*/, '\1' @style.gsub! "\t", '' end
Replace color values with their shorter equivalent
-
Turn rgb(,,)-colors into -values
-
Shorten AABBCC down to ABC
-
Replace names with their shorter hex-equivalent
-
white -> fff
-
black -> #000
-
-
Replace -values with their shorter name
-
f00 -> red
-
# File lib/smurf/rainpress.rb, line 97 def shorten_colors! # rgb(50,101,152) to #326598 @style.gsub! /rgb\s*\(\s*([0-9,\s]+)\s*\)/ do |match| out = '#' $1.split(',').each do |num| out += '0' if num.to_i < 16 out += num.to_i.to_s(16) # convert to hex end out end # Convert #AABBCC to #ABC, keep if preceed by a '=' @style.gsub! /([^\"'=\s])(\s*)#([\da-f])\3([\da-f])\4([\da-f])\5/i, '\1#\3\4\5' # At the moment we assume that colours only appear before ';' or '}' and # after a ':', if there could be an occurence of a color before or after # an other character, submit either a bug report or, better, a patch that # enables Rainpress to take care of this. # shorten several names to numbers ## shorten white -> #fff @style.gsub! /:\s*white\s*(;|\})/, ':#fff\1' ## shorten black -> #000 @style.gsub! /:\s*black\s*(;|\})/, ':#000\1' # shotern several numbers to names ## shorten #f00 or #ff0000 -> red @style.gsub! /:\s*#f{1,2}0{2,4}(;|\})/i, ':red\1' end