From: "Ara.T.Howard" <ahoward@...>
Date: 2004-03-18T01:24:38+09:00
Subject: Re: why use heredoc in doublequotes?

On Wed, 17 Mar 2004, Robert Klemme wrote:

> 
> "Simon Strandgaard" <neoneye@adslhome.dk> schrieb im Newsbeitrag
> news:pan.2004.03.16.19.37.24.107822@adslhome.dk...
> > When you can do like this:
> >
> > server> ruby a.rb
> > "im some text\n"
> > server> cat a.rb
> > str = <<TEXT.squeeze("o")
> > im soooome text
> > TEXT
> > p str
> > server>
> >
> >
> > What is the rationale for doing <<"TEXT"  ?
> >
> > Have I misunderstood it?
> 
> IMHO "<<TEXT" is equivalent to <<TEXT with the only difference that you
> can use white space in the delimiter (see example d):


_and_ you can delim with tokens reserved for ruby's syntax:

  ~/eg/ruby > cat heredoc.rb 
  s = 'foobar'

  p <<"<<"
    #{ s }
  <<

  ~/eg/ruby > ruby heredoc.rb 
  "  foobar\n"


-a

> 
> irb(main):002:0> a=<<HERE
> irb(main):003:0" 5+2=#{5+2}
> irb(main):004:0" HERE
> => "5+2=7\n"
> irb(main):005:0> b=<<"HERE"
> irb(main):006:0" 5+2=#{5+2}
> irb(main):007:0" HERE
> => "5+2=7\n"
> irb(main):008:0> c=<<'HERE'
> irb(main):009:0' 5+2=#{5+2}
> irb(main):010:0' HERE
> => "5+2=#{5+2}\n"
> irb(main):024:0> d=<<"HERE AM I"
> irb(main):025:0" 5+2=#{5+2}
> irb(main):026:0" HERE AM I
> => "5+2=7\n"
> irb(main):027:0> d=<<HERE AM I
> irb(main):028:0" 5+2=#{5+2}
> irb(main):029:0" HERE AM I
> irb(main):030:0" HERE
> SyntaxError: compile error
> (irb):27: syntax error
> d=<<HERE AM I
>            ^
>         from (irb):27
> irb(main):031:0>
> 
> Regards
> 
>     robert
> 
> 

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