Module: CssWaxer

Defined in:
lib/csswaxer.rb

Class Method Summary collapse

Class Method Details

.wax(dirty_css) ⇒ Object

Return a waxed version of a dirty CSS file, either local or remote



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# File 'lib/csswaxer.rb', line 13

def wax(dirty_css)
  # Open either a local or a remote file depending on the path
  parser = CssParser::Parser.new    
  if dirty_css =~ /^https?:\/\/\S+$/i then
    parser.load_uri! dirty_css
  else
    parser.load_file! dirty_css
  end
  
  properties = {}
  # First make sure to take the most important property values for each selector
  parser.each_selector(:screen).each do |ruleset|
    declarations = ruleset[:rules].instance_variable_get(:@declarations)
    ruleset[:rules].selectors.each do |selector|
      declarations.each do |property, values|
        triple = [selector.strip, [values[:value].strip, values[:is_important]]]
        unless properties.has_key?(property)
          properties[property] = []
        end
        previous_value = properties[property].assoc(selector.strip)
        if previous_value.nil? 
          properties[property] << triple
        # Overwrite only if more important than the existing value
        elsif !previous_value[1][1] || values[:is_important]
          previous_value[1] = [values[:value].strip, values[:is_important]]
        end
      end      
    end
  end

  # Next merge selectors with the same values for each property to save space
  merged = {}
  properties.each do |property, values|
    merged[property] = []
    values.each do |triple|
      if previous_value = merged[property].assoc(triple[1])
        previous_value[1] << triple[0]
      else
        merged[property] << [triple[1], [triple[0]]]
      end
    end
  end
  
  # Finally write to CSS, ordered by family
  css_families.each do |family, properties|
    next unless merged.keys.any?{|property| properties.include? property}
    puts titleize(family)
    properties.each do |property|
      next unless merged.has_key? property
      puts "\n/* #{property} */"
      merged[property].each do |values, selectors|
        important = " !important" if values[1]
        puts "#{selectors.join(", ")}\t{#{property}: #{values[0]}#{important}}"
      end
      merged.delete property
    end
  end
  # Write the remaining (unrecognized) properties at the end
  unless merged.empty?
    puts titleize("Unrecognized properties")
    merged.each do |property, values_and_selectors|
      puts "\n/* #{property} */"
      values_and_selectors.each do |values, selectors|
        important = " !important" if values[1]
        puts "#{selectors.join(", ")}\t{#{property}: #{values[0]}#{important}}"
      end
      merged.delete property
    end
  end
end