[ruby-core:45025] Re: [ruby-trunk - Bug #6425][Open] Psych issue with !!omap

On Sat, May 12, 2012 at 04:55:08AM +0900, trans (Thomas Sawyer) wrote:
> 
> Issue #6425 has been reported by trans (Thomas Sawyer).
> 
> ----------------------------------------
> Bug #6425: Psych issue with !!omap
> https://bugs.ruby-lang.org/issues/6425
> 
> Author: trans (Thomas Sawyer)
> Status: Open
> Priority: Normal
> Assignee: 
> Category: lib
> Target version: 
> ruby -v: ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-linux]
> 
> 
> =begin
> 
> Psych doesn't seem to know ordered map. It parses fine, but loose the type when round-tripped.
> 
>   a = YAML.load %{
>     --- !!omap
>     a: 1
>     b: 2
>   }
>   => {"a"=>1, "b"=>2}
>   a.class
>   => Hash
>   puts a.to_yaml
>   ---
>   a: 1
>   b: 2
> 
> =end

Are you sure this is Psych and not Syck?  Psych raises a syntax error on
your example:

    irb(main):001:0> require 'psych'
    => true
    irb(main):002:0> require 'yaml'
    => true
    irb(main):003:0> a = YAML.load %{
    irb(main):004:0"   --- !!omap
    irb(main):005:0"   a: 1
    irb(main):006:0"   b: 2
    irb(main):007:0" }
    Psych::SyntaxError: (<unknown>): mapping values are not allowed in this context at line 3 column 4
            from /Users/aaron/.local/lib/ruby/2.0.0/psych.rb:203:in `parse'
            from /Users/aaron/.local/lib/ruby/2.0.0/psych.rb:203:in `parse_stream'
            from /Users/aaron/.local/lib/ruby/2.0.0/psych.rb:151:in `parse'
            from /Users/aaron/.local/lib/ruby/2.0.0/psych.rb:127:in `load'
            from (irb):3
            from /Users/aaron/.local/bin/irb:12:in `<main>'
    irb(main):008:0>

Can you provide a runnable test case to reproduce your error?

-- 
Aaron Patterson
http://tenderlovemaking.com/