# Ah... CSSes...

require 'csses_helpers'

# The CSSes class takes some files, figures out what HTML is referenced
# or generated in them, and puts those all into an array called elements.
class CSSes
  VERSION = '1.0.0'
  
  UNFASHIONABLE_ELEMENTS = %w(html head meta title)
  RAILS_HELPERS = { /\blink_to\w*\b/ => 'a',
                    /\bimage_tag\b/ => 'img',
                    /\blabel\b/ => 'label',
                    /\bform(?:_(?:for|tag))\b/ => 'form',
                    /\btext_area(?:_tag)?\b/ => 'textarea',
                    /\btext_field(?:_tag)?\b/ => 'input',
                    /\bcheck_box_tag\b/ => 'input',
                    /\bfield_set_tag\b/ => 'fieldset',
                    /\bfile_field_tag\b/ => 'input',
                    /\bimage_submit_tag\b/ => 'input',
                    /\bpassword_field_tag\b/ => 'input',
                    /\bradio_button_tag\b/ => 'input',
                    /\bselect_tag\b/ => 'select',
                    /\bsubmit_tag\b/ => 'input' }
  RAILS_HTML_ID_OR_CLASS = /(?::(id|class))\s*=>\s*['"](\w+)['"]/
  
  attr_reader :elements
  
  # Give it a list of files as an array (not splatted), get back, well,
  # a CSS object, but one with an array of CSS elements as an attribute.
  def initialize(files)
    @elements = []
    files.each do |file|
      source = File.read(file)
      @elements << source.scan(/<(\w+)/)
      source.scan(/<(\w+)\s+[^>]*(class|id)="(\w+)"/).each do |elem|
        @elements << "#{elem[0]}#{css_sym_for_attribute(elem[1])}#{elem[2]}"
      end
      RAILS_HELPERS.each do |regex, tag|
        source.scan(/#{regex}.*/).each do |line|
          if line.match(RAILS_HTML_ID_OR_CLASS)
            @elements << "#{tag}#{css_sym_for_attribute($1)}#{$2}"
          end
          @elements << tag
        end
      end
    end
    
    @elements.flatten!
    @elements.uniq!
    @elements.sort!
    @elements -= UNFASHIONABLE_ELEMENTS
    
    apply_pseudo_classes!
  end
  
  private
  
  # Generates the typical pseudo-classes for anchors (visited, hover, active).
  def apply_pseudo_classes!
    @elements.each_with_index do |e, i|
      if e.match(/\Aa(?:[#\.]\w+)?/)
        @elements[i] = [e, "#{e}:visited", "#{e}:hover", "#{e}:active"]
      end
    end
    @elements.flatten!
  end
end