Ilya Zakharevich on Mon, 22 Nov 1999 13:43:23 -0500

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Re: Turning a sequence of expr into expr

On Mon, Nov 22, 1999 at 03:47:51PM +0100, Karim BELABAS wrote:
> [Ilya:]
> > Then this should be marked in the "prototype", and the parser should
> > emit a syntax error in such a situation.  The simplest way to do it is
> > to make lisexpr() to die if it finds ';' at the end, and make lisseq()
> > use a clone lisexpr_seqok() instead.
> I introduced a new parser code for the function "prototypes" (from GP point
> of view). Namely 'E' for an argument which is a single expression (read by
> lisexpr()). 'I' remains the same and accepts a sequence of statements.
> All genuine control statements + the constructors (vector/matrix) accept a
> seq. All others expect an expr. [ I believe I have correctly updated the
> numeric code for Math::Pari ]

Oups, Karim,

this means that string-code parsing logic of Math::Pari should be
changed.  Why not add a code 'M' for "many statements" instead (and
use it with those rare [control-flow] opcodes which take a seq?