gistfile1.rb

Tpl.new("Testing loops: <% 3.times do %> * <% end %>")

# =>

def self.render(__v = {}, __o = '')
  __o.concat("Testing loops: ")
  3.times do 
    __o.concat(" * ")
  end 
  __o
end

Tpl.new("The sum is <%=2+2%> Also substitute <%=myfield%> ok", %w(myfield))

# =>

def self.render(__v = {}, __o = '')
  myfield = __v[:myfield]
  __o.concat("The sum is ")
  __r = (2+2).to_s
  __o.concat(__r)
  __o.concat(" Also substitute ")
  __r = (myfield).to_s
  __o.concat(__r)
  __o.concat(" ok")
  __o
end