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Re: [GLISS] why the hell all this fuss
From: |
David Kastrup |
Subject: |
Re: [GLISS] why the hell all this fuss |
Date: |
Sat, 08 Sep 2012 17:00:18 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.2.50 (gnu/linux) |
Han-Wen Nienhuys <address@hidden> writes:
> On Fri, Sep 7, 2012 at 4:42 AM, David Kastrup <address@hidden> wrote:
>>> There's one thing worth clarifying: when i say "syntax changes", i
>>> mean "changes in how user input looks like". So a renaming of a
>>> command is a syntax change to me (despite the fact that no grammar
>>> rules change).
>>> That's probably confusing - what word should i use when i mean
>>> "changes in how user input looks like"?
>>
>> No idea. What we have under the umbrella of "syntax discussion"
>> contains three things: lexical units, grammar and vocabulary, mostly
>> implemented in lexer.ll, parser.yy, and *.ly respectively. In order to
>> keep syntax predictable, we want to be able to solve most problems just
>> by extending the vocabulary. That means that lexical units and grammar
>> should be as generic, powerful, and simple as possible. Specialized
>> lexical modes take power from the vocabulary. We want to avoid them as
>> much as possible given our historic constraints.
>
> I completely agree with this. I have been giving some people a hard
> time in this discussion, but that is primarily for wanting to mess
> with either lexer.ll or parser.yy. As long as you don't that, I will
> not object fiercely to what syntax proposal anyone comes up with.
Actually, is there a particular reason we are generating a C parser
rather than a C++ parser? The implications regarding marking and
garbage collection of semantic values are rather awful.
Probably historic because Bison did not use to come with C++ skeleton
files?
--
David Kastrup
- Re: [GLISS] why the hell all this fuss, Janek Warchoł, 2012/09/06
- Re: [GLISS] why the hell all this fuss, David Kastrup, 2012/09/07
- Re: [GLISS] why the hell all this fuss, Janek Warchoł, 2012/09/07
- Re: [GLISS] why the hell all this fuss, David Kastrup, 2012/09/07
- Re: [GLISS] why the hell all this fuss, Janek Warchoł, 2012/09/07
- Re: [GLISS] why the hell all this fuss, David Kastrup, 2012/09/07
- Re: [GLISS] why the hell all this fuss, Werner LEMBERG, 2012/09/07
- Re: [GLISS] why the hell all this fuss, David Kastrup, 2012/09/07
Re: [GLISS] why the hell all this fuss, Han-Wen Nienhuys, 2012/09/08