[Doxygen-develop] Mixed language-project with c-comments and matlab-comments

[<Eck...@t-...>]

Hello Everybody.

For my nassi-shneiderman generator for doxygen 
(https://sourceforge.net/projects/moritz/) I'm working on an interface 
for the programming-language matlab.For a first demo-release I created 
some example-sources which I want to use together with my already 
existing c-based  description of the general function of Moritz to 
create with doxygen a documentation. This means I have some txt-files 
with c-comment blocks (where I have defined *.txt as FILE_PATERNS). This 
c-comment-blocks contain doxygen group- and page-definitions which are 
traditionally used from me as description of the language independent 
parts of the documentation. In addition I have some files which contain 
comment-blocks in the programming-language for what I want to add 
examples.  For python this works very good, since doxygen is already 
able to understand python-files as well as c-files. But since doxygen 
does not know matlab, I have to use a perl-filter for those files. The 
perl-filter itself works well as long as I only use my matlab-files. But 
I'm not able to configure doxygen to use this filter for matlab-files 
only and to use its own build-in c-parser for all other files.

If I use
  INPUT_FILTER = "perl ./folder/subfolder/m2cpp.pl"
all matlab-files will be parsed correctly but the files with the 
c-comments will be ignored.

If I use
  FILTER_PATTERNS = "*.m=perl ./folder/subfolder/m2cpp.pl"
doxygen tells me that the perl-script can not be opened. The c-comment 
files will be analysed but not the matlab-files.

I had the idea to use
  INPUT_FILTER = "perl ./folder/subfolder/m2cpp.pl"
together with
  FILTER_PATTERNS = "*.txt=?????    
to use the perl-fileter as default-filter and to deactivate it for the 
txt-files which contain the c-comment blocks. But I don't know what to 
use instead for the question-marks to ensure that no filter will be used 
but  the doxygen-parser directly.

Is someone able to help me?

With many thanks,
                             Eckard Klotz.