Class: InlineStyles::Page

Inherits:
Object
  • Object
show all
Defined in:
lib/inline_styles.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(html) ⇒ Page

Returns a new instance of Page.



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# File 'lib/inline_styles.rb', line 6

def initialize(html)
  @html = html
end

Instance Attribute Details

#html ⇒ Object

Returns the value of attribute html.



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# File 'lib/inline_styles.rb', line 4

def html
  @html
end

Instance Method Details

#apply(css) ⇒ Object 



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# File 'lib/inline_styles.rb', line 10

def apply(css)
  require_dependencies

  parser = CssParser::Parser.new
  parser.add_block! css

  tree = Hpricot(html)

  stable_sorter = 0
  selectors = []

  # extracting selectors via the API rather than
  # just reaching in and grabbing @selectors
  parser.each_selector do |selector, declarations, specificity|
    selectors << [selector, declarations, specificity]
  end

  # stable-sort the selectors so that we get them sorted
  # by specificity but also keeping their rough
  # original order. This is how CSS selectors are applied
  # in a browser
  selectors.sort_by do |selector|
    [selector.last, stable_sorter += 1]
  end.each do |selector, declarations, spec|
    # Find each element matching the given slector
    (tree/selector).each do |element|
      # Merge any previously-inlined style with the
      # latest (higher specificity) one
      element['style'] ||= ''
      element['style'] = CssParser.merge(
        CssParser::RuleSet.new('', element['style'], 1),
        CssParser::RuleSet.new('', declarations, 2)
      ).declarations_to_s
    end
  end

  tree.to_s
end