>>> I read a paper once (at the University of New Brunswick (Canada))
>>> library in which the grammar for a language was used to construct a
>>> data compressor for syntaxly correct programs.  The output was a
>>> compressed form of a parse/syntax tree with comments and white space
>>> included. Once decompressed, the tree could be used to reconstruct
>>> the source.  I don't know if a compressed syntax tree would be very useful 
>>> for
>>> programming tasks but it could be used to compress Smalltalk's source
>>> file and changes file.  This assumes the time saved by filing in
>>> smaller chucks of programs segments would greater than the cost of
>>> decompression.
>> 
>> do you have the reference?
>> One guy told me and in Oberon or something like that the ast was compressed 
>> long time ago.
> 
> Franz, M. & Kistler, T. (1997), 'Slim Binaries', Commun. ACM 40 (12) , 87--94 
> .
> http://dl.acm.org/citation.cfm?id=265576

Ok we know this one :)

Stef

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