jlash@cbnewsd.att.com (john.k.lash) (06/01/90)
Does anyoue have or know of a "syntax tolerant" diff program for C files?
What I have in mind is a diff that works on the level of C expressions,
functions, and declarations as opposed to text lines. For instance it
should not consider the following two code fragments to be different:
x=y+z; a=b+c;
-------
x = y + z;
a = b+c;
Also, it should ignore equivalent functions at different places in the
source files. I could add lots of other things like ignoring differences
in the ordering of local variables, #defines, and structure definitions.
When it finds a difference it could print the offending lines and line
numbers.
How bout it, does such a thing exist? I haven't thought of any impossible
problems with doing this short of finding the time.
thanks for any help
--john
john lash jlash@ihlpa.att.combrnstnd@stealth.acf.nyu.edu (06/01/90)
In article <1990May31.185500.29790@cbnewsd.att.com> jlash@cbnewsd.att.com (john.k.lash) writes: > Does anyoue have or know of a "syntax tolerant" diff program for C files? It sounds like you want to pipe both programs through a reindenter before diffing them. To keep track of the original line numbers, your safest bet is to use cpp and then add /* 356 */, /* 357 */, ... > Also, it should ignore equivalent functions at different places in the > source files. I could add lots of other things like ignoring differences > in the ordering of local variables, #defines, and structure definitions. cpp handles any #define trickery. For the reordering: After a reindent, sort the ``pieces'' of the code into order, where pieces are external declarations, function definitions, etc. This is really easy if your indent can manage to separate pieces by spaces. Similarly sort the local variables within each block. ---Dan
david@eng.sun.com (habafropzipulops) (06/02/90)
In article <1990May31.185500.29790@cbnewsd.att.com> jlash@cbnewsd.att.com (john.k.lash) writes: >Does anyoue have or know of a "syntax tolerant" diff program for C files? Sure -- Dick Grune's "sim". It's in the comp.sources.unix archives, vol 3 and 4. -- David DiGiacomo, Sun Microsystems, Mt. View, CA david@eng.sun.com