Re: [Cgdb-devel] Mac OS X 10.5 cgdb Patches

[Kyle M. <ma...@gm...>]

On Jul 21, 2009, at 18:36, Bob Rossi wrote:
> On Mon, Jun 15, 2009 at 04:18:51PM -0700, Kyle McKay wrote:
>> cgdb-0.6.4 has difficulties building for Mac OS X 10.5.  It needs to
>> have HAVE_OPENPTY defined.
>>
>> You can either do:
>>
>>   CFLAGS=-DHAVE_OPENPTY ./configure
>>
>> Or apply a patch to configure.init.  The patches are attached to cgdb
>> bug 2806868 here:
>>
>>   https://sourceforge.net/tracker/?func=detail&aid=2806854&group_id=72581&atid=534974
>
> OK, I've applied this patch, please try this test release,
>  http://brasko.net:81/bob/cgdb-20090721.tar.gz
> and let me know how it works out. If it works for you, I'll put it
> in the next release.

It configured, built and ran on both Mac OS X 10.4.11 and Mac OS X  
10.5.7.  See attached gzipped script output.  (Note that I had already  
separately installed a compatible version of readline first as the  
native Mac OS X readline (4.2) is too old -- that installation is not  
included in the script output.)

>> Additionally, Mac OS X commonly uses files with
>> extensions .cp, .m, .mm and .M.  These files are not currently
>> colorized by the cgdb tokenizer.  The C tokenizer does a very good  
>> job
>> with these (.cp = C++, .m = Objective-C, .mm/.M = Objective-C++).  A
>> simple patch to tokenizer.c allows the C tokenizer to colorize these.
>> The patch is attached to cgdb bug 2806868 here:
>>
>>   https://sourceforge.net/tracker/?func=detail&aid=2806868&group_id=72581&atid=534974

What about the ".cp" extension?  That's a normal C++ file?  Please add  
the .cp extension to the list of extensions handled by the existing  
lexer -- ".cp" is a commonly used C++ extension in a variety of open  
source file projects.

> I'd prefer not to do a solution like this. However, if you want to  
> write
> the entire scanner for the Objective-C++ language, I'll accept it.

I will be happy to do that.  Since the Objective-C language has  
exactly the same tokenizer as the C language it likely wouldn't  
require much effort to create an Objective-C/Objective-C++ highlighter  
from the existing C/C++ one already in cgdb.

FYI here is some valid C:

#define doubleit * 2
typedef int id;

id array[20];
id value = 7;
id x = array[value doubleit]; /* index integer array */

Here is some valid Objective-C:

#include <objc/objc.h>
id value = nil; /* id and nil are defined in objc.h */
id x = [value doubleit]; /* send doubleit message to value object */

Objective-C provides minor extensions to the C grammar.  Objective-C  
is a very thin layer on top of C, and moreover is a strict superset of  
C.  Objective-C treats token sequences between '[' and ']' specially  
when the '[' ... ']' sequence appears in certain grammar contexts.   
Objective-C does introduce some special two-token keywords that start  
with '@' such as '@class', '@interface', '@implementation', '@end',  
etc. and if the first token after the '[' of a special '[' ... ']'  
sequence is the identifier 'self' or 'super' it is treated specially.   
Finally Objective-C adds the '#import' directive that's identical to  
'#include' except it's guaranteed to only include files once.   
Objective-C++ is identical to Objective-C except that the extensions  
are provided to the C++ grammar rather than the C grammer.

> I can show you what to do if you want. It's mostly just a flex scanner
> under the hood. All you really need to do is enumerate all the  
> keywords.

Sure, I'll be happy to create a flex scanner since it will be  
basically a copy of the C/C++ one that's already there plus  
recognition of the few special Objective-C keywords/types that are  
added and '#import'.  The existing C/C++ scanner already does 99% of  
what it needs to do for Objective-C/Objective-C++ sources.

Just point me to the code.

Thanks,

Kyle

> Thanks,
> Bob Rossi
>
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