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Date: Wed, 8 Mar 2017 12:05:13 +0000
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To: Sebastian Bergmann <sebastian@php.net>
Subject: Re: [PHP-DEV] generating code from AST
From: inefedor@gmail.com (Nikita Nefedov)


> On 8 Mar 2017, at 08:49, Sebastian Bergmann <sebastian@php.net> wrote:
>=20
> Am 07.03.2017 um 11:33 schrieb Derick Rethans:
>> Because installing an extension is too hard?
>=20
> No. To ensure that userland functionality that is based on compiler
> internals (token stream, abstract syntax tree, bytecode) does not fall =
out
> of sync with the compiler.
>=20
> We already have an extension that is built-in and enabled-by-default =
for
> the token stream. Why not have one for the abstract syntax tree and
> bytecode representations?

To be honest, that=92s exactly what we might want to avoid. Last time =
someone wanted to do actual improvements to our lexing they were stopped =
because changing tokens would mean breaking code that relies on =
`token_get_all()` which is a core extension user land function.

It might be though that it=92s only the problem with lexing and it =
should not be a problem for AST because it is, ahem, abstract.=