class Erector::Promise

# File lib/erector/promise.rb, line 9
def initialize(output, tag_name, attributes = {}, self_closing = false, newliney = true, &inside_renderer)
  raise "bad output: #{output.inspect}" unless output.is_a? Output
  raise "forgot self-closing" unless [false, true].include? self_closing

  @output = output

  # todo: pointer to Tag object?
  @tag_name = tag_name
  @self_closing = self_closing
  @newliney = newliney

  @attributes = {}
  _set_attributes attributes
  @text = nil
  @inside_renderer = inside_renderer
  _mark
end

# File lib/erector/promise.rb, line 128
def _attributes
  @attributes
end

# File lib/erector/promise.rb, line 136
def _close_tag
  @close_tag
end

# File lib/erector/promise.rb, line 33
def _mark
  @mark = @output.mark
end

# File lib/erector/promise.rb, line 132
def _open_tag
  @open_tag
end

# File lib/erector/promise.rb, line 41
def _render
  _rewind
  _render_open_tag
  begin
    _render_inside_tag
  ensure
    _render_close_tag
  end
end

# File lib/erector/promise.rb, line 75
def _render_close_tag
  return if @self_closing

  @output.undent
  @output<< RawString.new("</#{@tag_name}>")
  if @newliney
    @output.newline
  end
end

# File lib/erector/promise.rb, line 65
def _render_inside_tag
  return if @self_closing
  if @text
    @output << @text
  end
  if @inside_renderer
    @inside_renderer.call
  end
end

# File lib/erector/promise.rb, line 51
def _render_open_tag

  @output.newline if !@self_closing and @newliney and !@output.at_line_start?

  @output << RawString.new( "<#{@tag_name}#{Promise.format_attributes(@attributes)}")
  if @self_closing
    @output << RawString.new( " />")
    @output.newline if @newliney
  else
    @output << RawString.new( ">")
    @output.indent
  end
end

# File lib/erector/promise.rb, line 37
def _rewind
  @output.rewind @mark
end

# File lib/erector/promise.rb, line 27
def _set_attributes attributes
  attributes.each_pair do |k,v|
    @attributes[k.to_s] = v
  end
end

# File lib/erector/promise.rb, line 124
def _tag_name
  @tag_name
end

# File lib/erector/promise.rb, line 85
def method_missing(method_name, *args, &block)
  method_name = method_name.to_s
  if Erector::Widget.hyphenize_underscores
    method_name = method_name.gsub(/_/, "-")
  end

  if method_name =~ /\!$/
    id_str = method_name[0...-1]
    raise ArgumentError, "setting id #{id_str} but id #{@attributes["id"]} already present" if @attributes["id"]
    @attributes["id"] = id_str
  else
    if @attributes["class"]
      @attributes["class"] += " "
    else
      @attributes["class"] = ""
    end
    @attributes["class"] += method_name.to_s
  end

  if block_given?
    @inside_renderer = block
  end

  if args.last.is_a? Hash
    attributes = args.pop
    _set_attributes attributes
  end

  # todo: allow multiple args
  # todo: allow promise args
  @text = args.first

  _render

  self
end