Class: Rainpress

Inherits:
Object
  • Object
show all
Defined in:
lib/rainpress.rb,
lib/rainpress/version.rb

Constant Summary collapse

VERSION = 
'1.0.1'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

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

Returns a new instance of Rainpress.



6
7
8
9
10
11
12
13
14
15
16
 
# File 'lib/rainpress.rb', line 6

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 



2
3
4
 
# File 'lib/rainpress.rb', line 2

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



19
20
21
22
23
24
25
26
 
# File 'lib/rainpress.rb', line 19

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.



112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
 
# File 'lib/rainpress.rb', line 112

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.



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
 
# File 'lib/rainpress.rb', line 34

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.



58
59
60
 
# File 'lib/rainpress.rb', line 58

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

#remove_spaces! ⇒ Object

Remove unneeded spaces

  1. Turn mutiple spaces into a single

  2. Remove spaces around ;:{},

  3. Remove tabs



67
68
69
70
 
# File 'lib/rainpress.rb', line 67

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

#shorten_colors! ⇒ Object

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



81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
 
# File 'lib/rainpress.rb', line 81

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