[lnkForumImage]
TotalShareware - Download Free Software
Confronta i prezzi di migliaia di prodotti.
Asp Forum
 Home | Login | Register | Search 


 

Forums >

comp.lang.ruby

Heredocs and white space

Jack Christensen

7/29/2006 1:37:00 AM

Is there some reason heredocs fail if there is white space after the
closing string? Until I realized what was happening this caused me a
good bit of trouble. Invisible characters shouldn't cause stuff to fail.

Example:
s = <<-HEREDOC
bla bla bla
HEREDOC

This fails with:

heredoc.rb:3: can't find string "HEREDOC" anywhere before EOF
heredoc.rb:1: parse error, unexpected $, expecting tSTRING_CONTENT or
tSTRING_DB
EG or tSTRING_DVAR or tSTRING_END

Delete the spaces at the end of the 3rd line and it works.

I looked through the relevant PickAxe sections and didn't find anything.

Jack
4 Answers

dblack

7/29/2006 1:50:00 AM

0

dblack

7/29/2006 2:00:00 AM

0

John Wilger

7/29/2006 3:31:00 AM

0

On 7/28/06, dblack@wobblini.net <dblack@wobblini.net> wrote:
> Actually I don't think I answered your question. Looking at your
> example again, it does look odd. "HEREDOCabc" would be ignored,
> whereas "HEREDOC " causes a failure. I'm not sure why.

Seems to be specific to the "<<-" notation.

irb(main):001:0> s = <<HEREDOC
irb(main):002:0" bla bla bla
irb(main):003:0" HEREDOC
irb(main):004:0" HEREDOC
=> "bla bla bla\nHEREDOC \n"


with a space at the end of line 3 works as expected.

--
Regards,
John Wilger
http://john...

-----------
Alice came to a fork in the road. "Which road do I take?" she asked.
"Where do you want to go?" responded the Cheshire cat.
"I don't know," Alice answered.
"Then," said the cat, "it doesn't matter."
- Lewis Carrol, Alice in Wonderland

furlan primus

7/30/2006 9:52:00 PM

0

Jack Christensen wrote:

> Example:
> s = <<-HEREDOC
> bla bla bla
> HEREDOC
> This fails with:
>
> heredoc.rb:3: can't find string "HEREDOC" anywhere before EOF
> heredoc.rb:1: parse error, unexpected $, expecting tSTRING_CONTENT or
> tSTRING_DB
> EG or tSTRING_DVAR or tSTRING_END
>
> Delete the spaces at the end of the 3rd line and it works.

It works then because "HEREDOC" is equal to "HEREDOC", when the space at
the end is present it's "HEREDOC ". I just tried it at the command line
using bash and when there was a space at the end it did not blow up, it
merely included the "HEREDOC " as the last line. Removing the space
caused it to work correctly. I did not try it under perl or php.


--

Music: http://www.myspace.com...

Links: http://del.icio...

Home: http://thispaceavailable.uxb.net/...

We are here to laugh at the odds and live our lives so well that Death
will tremble to take us.
-- Charles Bukowski