module Rabbit::Parser::Ext::Enscript

# File lib/rabbit/parser/ext/enscript.rb, line 42
def check_availability(lang)
  if @@enscript_highlight.has_key?(lang)
    true
  else
    Rabbit.logger.warn(_("enscript: unsupported language: %s") % lang)
    false
  end
end

# File lib/rabbit/parser/ext/enscript.rb, line 114
def element_to_rabbit(element)
  case element.name
  when "pre"
    PreformattedText.new
  when "b"
    Keyword.new
  when "i"
    Element::Comment.new
  when "font"
    text = TextContainer.new
    color = element.get_attribute("color").to_s
    text.add_default_prop("foreground", color)
    text
  else
    format = _("enscript: unsupported element name: %s")
    Rabbit.logger.warn(format % element.name)
    nil
  end
end

# File lib/rabbit/parser/ext/enscript.rb, line 91
def extract_newline_around_pre(html)
  html = html.gsub(/<pre[^>]*>\n/i, '<pre\1>')
  html.gsub(/\n<\/pre>/i, '</pre>')
end

# File lib/rabbit/parser/ext/enscript.rb, line 96
def find_element(node, name)
  node.css(name)[0]
end

# File lib/rabbit/parser/ext/enscript.rb, line 51
def highlight(lang, text)
  begin
    require 'nokogiri'
  rescue
    Rabbit.logger.warning("Syntax highlight by enscript requires nokogiri.")
    return nil
  end

  src_file = Tempfile.new("rabbit-enscript")
  src_file.open
  src_file.print(text)
  src_file.close
  html_file = Tempfile.new("rabbit-enscript-html")
  args = [
          "--quiet", "--color", "--language=html",
          "--highlight=#{@@enscript_highlight[lang]}",
          "--output=#{html_file.path}",
          src_file.path,
         ]
  if SystemRunner.run("enscript", *args)
    html_file.open
    html_to_rabbit(html_file.read)
  else
    nil
  end
end

# File lib/rabbit/parser/ext/enscript.rb, line 78
def html_to_rabbit(html)
  node = Nokogiri::HTML(extract_newline_around_pre(html))
  pre = find_element(node, "pre")
  address = find_element(node, "address")
  element = node_to_rabbit(pre)
  if element
    Rabbit.logger.info(address.text) if address
    PreformattedBlock.new(element)
  else
    nil
  end
end

# File lib/rabbit/parser/ext/enscript.rb, line 100
def node_to_rabbit(node)
  element = element_to_rabbit(node)
  return nil if element.nil?
  node.children.each do |child|
    if child.text?
      element << Text.new(Escape.escape_meta_character(child.text))
    else
      child_element = node_to_rabbit(child)
      element << child_element unless child_element.nil?
    end
  end
  element
end