documenting string
in [Ruby]
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From: Ciur Eugen on 3 Aug 2010 14:37 Hi everyone, Below is a short and functioning program: #!/usr/bin/ruby def call_me e = <<SOME # # this is a nice string! # SOME e end puts call_me It runs and displays string between SOME delimiters. My question is why, if I add to first # (between SOME delim), like this #!/usr/bin/ruby def call_me e = <<SOME #@ # this is a nice string! # SOME e end puts call_me I got this error, in line with #@ sign: syntax error, unexpected $undefined Does #@ sign have a special meaning in ruby?
From: Bob Smith on 3 Aug 2010 15:00 I believe Ruby treats this as a double quoted string. The following seems to confirm that. irb(main):001:0> @cow = "bessie" => "bessie" irb(main):002:0> e = <<SOME irb(main):003:0" # irb(main):004:0" # moo irb(main):005:0" # irb(main):006:0" SOME => "#\n# moo\n#\n" irb(main):007:0> e => "#\n# moo\n#\n" irb(main):008:0> e = <<SOME irb(main):009:0" # irb(main):010:0" #@cow irb(main):011:0" # irb(main):012:0" SOME => "#\nbessie\n#\n" Looks like Ruby's sees the start of an instance variable when it hits the "@". -- Posted via http://www.ruby-forum.com/.
From: Ciur Eugen on 3 Aug 2010 15:16 Oh, indeed "instance variable"!! and #@something inside doc string it sees live "#{@something}"!!! Thank you very much, Bob, now understand! On Tue, Aug 3, 2010 at 10:00 PM, Bob Smith <rws1111(a)gmail.com> wrote: > I believe Ruby treats this as a double quoted string. The following > seems to confirm that. > > irb(main):001:0> @cow = "bessie" > => "bessie" > irb(main):002:0> e = <<SOME > irb(main):003:0" # > irb(main):004:0" # moo > irb(main):005:0" # > irb(main):006:0" SOME > => "#\n# moo\n#\n" > irb(main):007:0> e > => "#\n# moo\n#\n" > irb(main):008:0> e = <<SOME > irb(main):009:0" # > irb(main):010:0" #@cow > irb(main):011:0" # > irb(main):012:0" SOME > => "#\nbessie\n#\n" > > > Looks like Ruby's sees the start of an instance variable when it hits > the "@". > -- > Posted via http://www.ruby-forum.com/. > >
From: Brian Candler on 4 Aug 2010 04:15 Ciur Eugen wrote: > Oh, indeed "instance variable"!! > and #@something inside doc string it sees live "#{@something}"!!! > Thank you very much, Bob, now understand! And incidentally, you can change the semantics of heredocs to those of single-quoted strings by single-quoting the terminator. e.g. def call_me e = <<'SOME' #@ # this is a nice string! # SOME e end puts call_me (But this won't let you embed #{...} interpolation in your string either) -- Posted via http://www.ruby-forum.com/.
From: Eugen Ciur on 4 Aug 2010 04:45 Thank you Brian, that is really what I was looking for ! On 08/04/2010 11:15 AM, Brian Candler wrote: > Ciur Eugen wrote: > >> Oh, indeed "instance variable"!! >> and #@something inside doc string it sees live "#{@something}"!!! >> Thank you very much, Bob, now understand! >> > And incidentally, you can change the semantics of heredocs to those of > single-quoted strings by single-quoting the terminator. e.g. > > def call_me > e =<<'SOME' > #@ > # this is a nice string! > # > SOME > e > end > > puts call_me > > (But this won't let you embed #{...} interpolation in your string > either) >
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