Re: x + (y) + z

[Frank Heckenbach]

Derek M Jones wrote:

> The problem comes with '(x) + (y) + z' (which I gave as
> a example on comment in this thread, rather than starting a
> new thread; as if people were not confused enough).
> There are four possible parses of this expression: two
> of which are causing my current problem.  The two
> possible parse trees of interest are
>
> >If your grammar is different and it doesn't work for you, it might
> >help to post the relevant parts of your actual grammar.
> 
> Your grammar contained a single %merge.  I thought at
> least two are required?

All the involved (top-level) rules must have a `%merge'. In the
original example, both happened to be the same rule.

The second example works and shows all four trees (after fixing a
few precedences in the grammar) with another `%merge' -- in the
final grammar you might need some more.

Frank

-- 
Frank Heckenbach, address@hidden
http://fjf.gnu.de/
GnuPG and PGP keys: http://fjf.gnu.de/plan (7977168E)

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