[colm-users] new way of constructing trees

[Jim Cordy]

Cool, I think - not sure that I understand!

Jim


On 9-Sep-09, at 7:54 PM, Adrian Thurston wrote:

> Hi,
>
> I'm experimenting with a new way in Colm to make trees. The existing
> construct expression is useful for building trees in a bottom up
> fashion. It is parsed at compile-time to give some static assurance of
> success.
>
> The existing parse expression can be used to parse from a stream  
> source,
> or reparse the text of a tree as a new type. The parsing happens at
> run-time and may fail.
>
> A new third method, the accumulator, can be used to incrementally  
> build
> a tree by parsing little bits at a time. This is useful for building  
> an
> output tree over the course of a top-down, left-right traversal.
>
> See here for a simple example:
>
> http://svn.complang.org/colm/trunk/test/accum.lm
> http://svn.complang.org/colm/trunk/test/accum.in
>
> -Adrian
>
>
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