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Re: experimental features in Bison 2.3a+

From: Hans Aberg
Subject: Re: experimental features in Bison 2.3a+
Date: Mon, 4 Dec 2006 19:20:10 +0100

On 2 Dec 2006, at 06:23, Paul Eggert wrote:

2. The prologue alternatives: %code, %requires, %provides, and % code-top.

Yes.  Though to be honest I can't even remember what all of them are

In addition to those code-placement, there are a couple more potential for C++, which I cannot tell right off if they will be useful without experimentation. An in addition to those locations, for various purposes, not specifically C++, people wanted to be able to insert code in various places in the parser.

So it seemed me important to supply a mechanism by which those things could be done by merely changing the skeleton file, without having to tweak the Bison sources directly or hoping that the developers would eventually add this or that feature. That last might then be done, when a particular use has benn found to be sufficiently standard.

Or so, was my idea with %code. I am not sure what the idea is to now add a much more lmited variation of that command - evidently it is not in 2.3.a.

  Hans Aberg

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