rspec users - May 2009 - How do I get additional information from the Matcher?

Hi,

I am trying to implement my own matcher which use a special algorithm to 
do the semantics diff-ing between two proprietary configuration file.  
When come to the report, I would like my formatter to be able to have 
access to the original configuration file content as well as the 
diff-ing result.  By digging through the code, looks like all formatter 
can get is an ExpectationNotMetError with a string-based message 
embedded inside.  How do I make the matcher pass additional information 
to my formatter?  I see there is a class level variable called 
::Spec::Matchers.last_matcher which allows me to access the last 
matcher.  Is that the right away to implement this?  Or if there is any 
better way for me to add additional information into the 
ExpectationNotMetError exception?

Thanks,

--Gary

On Wed, May 20, 2009 at 6:32 PM, Gary Lin <glin at employees.org>
wrote:
> Hi,
>
> I am trying to implement my own matcher which use a special algorithm to do
> the semantics diff-ing between two proprietary configuration file. ?When
> come to the report, I would like my formatter to be able to have access to
> the original configuration file content as well as the diff-ing result. ?By
> digging through the code, looks like all formatter can get is an
> ExpectationNotMetError with a string-based message embedded inside. ?How do
> I make the matcher pass additional information to my formatter? ?I see
there
> is a class level variable called ::Spec::Matchers.last_matcher which allows
> me to access the last matcher. ?Is that the right away to implement this?
> ?Or if there is any better way for me to add additional information into
the
> ExpectationNotMetError exception?
There''s nothing built in. If you have any recommendations as to how
this should work, please feel free to file a feature request at
http://rspec.lighthouseapp.com.

Thanks,
David
>
> Thanks,
>
> --Gary
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