From: Gary Wright <gwtmp01@...>
Date: 2007-05-18T08:58:22+09:00
Subject: Re: Coopting String interpolation


On May 16, 2007, at 9:20 PM, aurelianito wrote:

> We all know the #{} operator for String interpolation.
> It's used like this:
>
> name="Aure"
> greeting="hi, #{name}"
>
> and greeting evaluates to "hi, Aure". But I would like to change it.
> Is there a pure Ruby way to force "hi, #{name}" to evaluate to "hi,
> AURE" (get the uppercase of the original interpolated String).

I just released my Jig package that might be helpful to you.

require 'rubygems'
require 'jig'

# Create a named 'gap' that upcases everything
upcase = Jig::Gap.new(:name) { |x| x.upcase }

# Create a jig consisting of a string, and the customize 'upcasing' gap.
greeting = Jig["hi, ", upcase]

# Fill the gap with data to generate a new jig.
# puts calls Jig#to_s to convert the new jig to a string

puts greeting % { :name => "Aure" }	# => hi, AURE
puts greeting % { :name => "Gary" }     # => hi, GARY