cowboyd / gist:886283

Created March 25, 2011


    
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      gistfile1.rb
    
    
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            require 'erb'
 
class WriterBinding
 
  attr_reader :_eoutvar
 
  def initialize(writer, context)
    @_eoutvar = OutputWriter.new(writer)
    for k,v in context
      self.instance_variable_set("@#{k}",v)
    end
  end
 
  def _eoutvar=(initial_value)
    puts "ignoring the assignment to #{initial_value.inspect}, because I don't want to be a string!!"
  end
 
  class OutputWriter
    def initialize(writer)
      @writer = writer
    end
    def concat(string)
      @writer.write(string)
    end
  end
end
 
t = ERB.new("Hello <%= @name %>", nil, nil, 'self._eoutvar')
 
writer = Object.new
def writer.write(bytes)
  print "<chunk>#{bytes}</chunk>"
end
 
cxt = WriterBinding.new(writer, :name => 'Charles')
 
t.result(cxt.instance_eval {binding})