Class: Erector::Promise

Inherits:
Object
  • Object
show all
Extended by:
Attributes, Text
Defined in:
lib/erector/promise.rb

Instance Method Summary collapse

Methods included from Attributes

format_attributes, format_sorted, sort_attributes

Methods included from Text

character, h, nbsp, raw, text, text!

Constructor Details

#initialize(output, tag_name, attributes = {}, self_closing = false, newliney = true, &inside_renderer) ⇒ Promise

Returns a new instance of Promise.



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# 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

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/erector/promise.rb', line 85

def method_missing(method_name, *args, &block)
  method_name = method_name.to_s
  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

Instance Method Details

#_attributes ⇒ Object 



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# File 'lib/erector/promise.rb', line 124

def _attributes
  @attributes
end

#_close_tag ⇒ Object 



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# File 'lib/erector/promise.rb', line 132

def _close_tag
  @close_tag
end

#_mark ⇒ Object 



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# File 'lib/erector/promise.rb', line 33

def _mark
  @mark = @output.mark
end

#_open_tag ⇒ Object 



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# File 'lib/erector/promise.rb', line 128

def _open_tag
  @open_tag
end

#_render ⇒ Object 



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# File 'lib/erector/promise.rb', line 41

def _render
  _rewind
  _render_open_tag
  begin
    _render_inside_tag
  ensure
    _render_close_tag
  end
end

#_render_close_tag ⇒ Object 



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# 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

#_render_inside_tag ⇒ Object 



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# 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

#_render_open_tag ⇒ Object 



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# 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

#_rewind ⇒ Object 



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# File 'lib/erector/promise.rb', line 37

def _rewind
  @output.rewind @mark
end

#_set_attributes(attributes) ⇒ Object 



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# File 'lib/erector/promise.rb', line 27

def _set_attributes attributes
  attributes.each_pair do |k,v|
    @attributes[k.to_s] = v
  end
end

#_tag_name ⇒ Object

are these accessors necessary?



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# File 'lib/erector/promise.rb', line 120

def _tag_name
  @tag_name
end