From: noreply@...
Date: 2007-03-21T14:05:06+09:00
Subject: [ ruby-Bugs-8026 ] YAML fails to parse its own input

Bugs item #8026, was opened at 2007-01-20 10:44
You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=8026&group_id=426

Category: Standard Library
Group: 1.9.x
Status: Open
Resolution: None
Priority: 3
Submitted By: Vincent Fourmond (fourmond)
Assigned to: Nobody (None)
Summary: YAML fails to parse its own input

Initial Comment:
In certain cases, when strings contains weird amount of whitespace, YAML fails to parse it's own output. The attached file, when run (1.8.5 and current trunk), produces the following error:

#<ArgumentError: syntax error on line 3, col 4: `    .'>

It seems excessive amount of whitespace confuses the parser. Is there another way to output long strings in a safe way ? The attached file also contains two really close examples that don't trigger the syntax error.

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Comment By: Jason May (jmay)
Date: 2007-03-20 22:05

Message:
This bug also appears on macosx.  Here's an even shorter example:

YAML.load("\n foo\nbar".to_yaml)

It seems to break when there is a leading newline-space and another newline further on.

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Comment By: Vincent Fourmond (fourmond)
Date: 2007-01-24 23:47

Message:
Thanks for the pointer, I got around the problem by simply
removing blank lines in strings, which was acceptable in my
case. 

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Comment By: Akira FUNAI (afunai)
Date: 2007-01-21 00:42

Message:
> Is there another way to output long strings in a safe way
?

Try "Syck compatible" mode of Ya2YAML (http://rubyforge.org/projects/ya2yaml/).

---
require 'yaml'
require 'rubygems'
require 'ya2yaml'

a = <<EOS

     r
    .
EOS

p a
s = a.ya2yaml(:syck_compatible => true)
begin
  YAML.load(s)
rescue Exception => e
  p e
end
---

p.s.
The second example in the attached file don't trigger the error, but have a roundtrip problem (a != YAML.load(a.to_yaml)). (ruby 1.8.5)


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You can respond by visiting: 
http://rubyforge.org/tracker/?func=detail&atid=1698&aid=8026&group_id=426