Class: Rainpress

Inherits:
Object
  • Object
show all
Defined in:
lib/webgen/vendor/rainpress.rb

Overview

Information

This is the main class of Rainpress, create an instance of it to compress your CSS-styles.

Author

Uwe L. Korn <[email protected]>

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(style, opts = {}) ⇒ Rainpress

Returns a new instance of Rainpress.



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# File 'lib/webgen/vendor/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

Class Method Details

.compress(style, options = {}) ⇒ Object

Quick-compress the styles. This eliminates the need to create an instance of the class



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# File 'lib/webgen/vendor/rainpress.rb', line 18

def self.compress(style, options = {})
  self.new(style, options).compress!
end

Instance Method Details

#compress! ⇒ Object

Run the compressions and return the newly compressed text



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# File 'lib/webgen/vendor/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_misc! ⇒ Object

Do miscellaneous compression methods on the style.



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# File 'lib/webgen/vendor/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_comments! ⇒ Object

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.



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# File 'lib/webgen/vendor/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_newlines! ⇒ Object

Remove all newline characters

We take care of Windows(rn), Unix(n) and Mac(r) newlines.



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# File 'lib/webgen/vendor/rainpress.rb', line 74

def remove_newlines!
	@style.gsub!(/\n|\r/, '')
end

#remove_spaces! ⇒ Object

  1. Turn mutiple spaces into a single

  2. Remove spaces around ;:{},

  3. Remove tabs



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# File 'lib/webgen/vendor/rainpress.rb', line 83

def remove_spaces!
  @style.gsub!(/\s*(\s|;|:|\}|\{|,)\s*/, '\1')
  @style.gsub!("\t", '')
end

#shorten_colors! ⇒ Object

  1. Replace #-values with their shorter name

    • #f00 -> red



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# File 'lib/webgen/vendor/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