From: Srijayanth Sridhar <srijayanth@...>
Date: 2009-05-08T14:49:13+09:00
Subject: Understanding { } and block_given

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Hello,

I have the following:

class DSL
   def DSL.load filename
      dsl = new
      dsl.instance_eval(File.read(filename))
      dsl
   end
   def to sym,*args,&block
      if block_given?
         b=class << self;self;end
         b.instance_eval {
            define_method(sym,*args,&block)
         }
      end
   end
   def method_missing sym,*args
      "#{sym}"
   end
   alias :say puts
end

foo=DSL.load("sample.dsl")


sample.dsl:

to smile do
   say ":)"
end
to be_polite {
   say "thank you"
}
smile
be_polite


The resulting output is:

moonwolf@trantor:~/ruby/dsl/todo$ ./dsl.rb
:)
moonwolf@trantor:~/ruby/dsl/todo$

be_polite and indeed, anything enclosded in {} doesn't seem to be eval-ed as
blocks. Why is this?

Jayanth

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