From: ts <decoux@...>
Date: 2002-09-24T00:27:16+09:00
Subject: Re: String[#.]interpolate (was Re: String interpolation at will?)

>>>>> "H" == Hal E Fulton <hal9000@hypermetrics.com> writes:

H> Can you show me an example of something
H> that fails?

pigeon% cat b.rb
#!/usr/bin/ruby
class String
   def String.interp=(blk)
      @@interp = blk
   end
end
  
# Back to top-level scope
String.interp = (Proc.new do |s|
                    __str = s.dup
                    __str.gsub!(/"/,'\"')
                    eval('"' + __str + '"')
                 end)
  
# Now define the methods
class String
   def String.interpolate(str)
      @@interp.call(str)
   end
   def interpolate
      @@interp.call(self)
   end
end

def aa
  
   str = <<'END'
He said, "I am the #{alpha} and
the #{omega}."
Have a nice day.
  
END
   puts str
  
   alpha = "WALRUS"
   omega = "WEATHER IS FINE"

   str2 = str.interpolate
   puts str2

   str3 = String.interpolate(str)
   puts str3
end

alpha = "walrus"
omega = "weather is fine"

aa
pigeon% 

pigeon% b.rb
He said, "I am the #{alpha} and
the #{omega}."
Have a nice day.
  
He said, "I am the walrus and
the weather is fine."
Have a nice day.
  
He said, "I am the walrus and
the weather is fine."
Have a nice day.
  
pigeon% 




Guy Decoux