CS5 Class

class CS5
  Pseudo_Classes = [
  /root/,
  /nth\-child\((\d+n\+\d+|\d+|odd|even)\)/,
  /nth\-last\-child\((\d+n\+\d+|\d+|odd|even)\)/,
  /nth\-of\-type\((\d+n\+\d+|\d+|odd|even)\)/,
  /nth\-last\-of\-type\((\d+n\+\d+|\d+|odd|even)\)/,
  /first\-child/,
  /last\-child/,
  /first\-of\-type/,
  /last\-of\-type/,
  /only\-child/,
  /only\-of\-type/,
  /empty/,
  /link/,
  /visited/,
  /active/,
  /hover/,
  /focus/,
  /target/,
  /lang\([a-zA-Z\-]+\)/,
  /enabled/,
  /disabled/,
  /cheked/
  ]
  
  Pseudo_Elements = [
  /first\-line/,
  /first\-letter/,
  /selection/,
  /before/,
  /after/
  ]
  
  Elements = [ 'a', 'abbr', 'acronym', 'address', 'applet', 'area', 'b', 'base', 'basefont', 'bdo', 'big', 'blockquote', 'body', 'br', 'button', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'dd', 'del', 'dfn', 'dir', 'div', 'dl', 'dt', 'em', 'fieldset', 'font', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'hr', 'html', 'i', 'iframe', 'img', 'input', 'ins', 'isindex', 'kbd', 'label', 'legend', 'li', 'link', 'listing', 'map', 'menu', 'meta', 'nextid', 'noframes', 'noscript', 'object', 'ol', 'optgroup', 'option', 'p', 'param', 'plaintext', 'pre', 'q', 's', 'samp', 'script', 'select', 'small', 'span', 'strike', 'strong', 'style', 'sub', 'sup', 'table', 'tbody', 'td', 'textarea', 'tfoot', 'th', 'thead', 'title', 'tr', 'tt', 'u', 'ul', 'var', 'xmp' ].sort(){|a,b| a.size <=> b.size}.reverse
  
  REGS = {
    'universal' => /\*/,
    'combinator' => /(\+|>|\~| )/,
    'element' => /(#{Elements.join('|')})/oi,
    'id' => /\#[a-zA-Z\\][a-zA-Z0-9_\-\\]*/,
    'class' => /\.[a-zA-Z\\][a-zA-Z0-9_\-\\]*/,
    'attribute' => /\[[a-zA-Z\-\:]+((\~|\^|\$|\*|\|)?=".*")?\]/,
    'pseudo-class' => /\:(#{ Pseudo_Classes.join('|')})/o,
    'pseudo-element' => /\:{1,2}(#{ Pseudo_Elements.join('|')})/o
  }
  REGS['negative-pseudo-class'] = /\:not\((#{REGS.values.join('|')})+\)/o
  REGS['element'] = /(^| )#{REGS['element']}/o
  
  def self.hash(_selector)
    spec = {
      'id' => 0,
      'class' => 0,
      'element' => 0,
      'universal' => 0,
      'pseudo-class' => 0,
      'pseudo-element' => 0,
      'negative-pseudo-class' => 0,
      'combinator' => 0
    }
    @selector = _selector.gsub(/\s+/,' ')
      # 否定擬似クラスは他セレクタを含むので優先的に実行
    @selector.gsub!( REGS['negative-pseudo-class']){ spec['negative-pseudo-class'] += 1; nil}
    ['id','class','element','universal','pseudo-class','pseudo-element','combinator'].each do | spectype |
      @selector.gsub!( REGS[spectype]){ spec[spectype] += 1; nil }
    end
    return 'Invalid selector: '+@selector if !@selector.empty? # 何一つのこらない。はず。
    spec
  end
end