inteligent diff?

I have a bungh of programs held under the SCCS source control program
and I want to be able to detect if the source of certain block
constructs has changed between revisions of a source file.


I have hacked together something using diff and awk, but
because the language is free-format it does not do the job
perfectly.


Does anyone have any tools to do the job better?


I have a yacc-based processor for the language, which builds
trees and then walks them. I could imagine building trees for
the old and new versions and then comparing. Does anyone
have algorithms for telling whether nodes have been added
or deleted when a difference occurs?


Norman Hilton (norman@kbss.bt.co.uk)
[I believe I've seen work on comparing parse trees. -John]
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