class Rainpress

# File lib/rainpress.rb, line 2
def self.compress(style, options = {})
  self.new(style, options).compress!
end

# 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

# 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

# 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

# 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

# File lib/rainpress.rb, line 58
def remove_newlines!
@style.gsub!(/\n|\r/, '')
end

# File lib/rainpress.rb, line 67
def remove_spaces!
  @style.gsub!(/\s*(\s|;|:|\}|\{|,)\s*/, '\1')
  @style.gsub! "\t", ''
end

# 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