From: SEKI Masatoshi <seki.at.druby.org@...>
Date: 2012-06-21T07:49:37+09:00
Subject: Re: Does ERB have recursive template support?

> 
> Same here:
> 
> #!/opt/bin/ruby19
> 
> require 'erb'
> 
> def rt(s)
>  e = ERB.new(s)
>  recursive = lambda {|a, level| e.result(binding)}
> end
> 
> arr = [
>  1,
>  2,
>  [3],
>  [4, [5]],
>  6
> ]
> 
> e = rt %Q{
>  <%= '  ' * level %>open level=<%= level %>
>  <%
>    if Enumerable === a
>      a.each do |x|
>        %><%= recursive[x, level + 1] %><%
>      end
>    else
>      %><%= '  ' * level %><%= a %><%
>    end
>  %>
>  <%= '  ' * level %>close level=<%= level %>
> }
> 
> p arr
> puts e[arr, 0]
> 
> Kind regards
> 
> robert

I like ERB#def_method.

#!/opt/bin/ruby19
require 'erb'

class View
  ERB.new(<<EOS).def_method(self, 'draw(a, level=0)')

 <%= '  ' * level %>open level=<%= level %>
 <%
   if Enumerable === a
     a.each do |x|
       %><%= draw(x, level + 1) %><%
     end
   else
     %><%= '  ' * level %><%= a %><%
   end
 %>
 <%= '  ' * level %>close level=<%= level %>
EOS
end

arr = [
 1,
 2,
 [3],
 [4, [5]],
 6
]

view = View.new

p arr
puts view.draw(arr)