Re: precedences vs. hierarchy

"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Mon, 6 Jun 2016 17:08:10 +0200

          From comp.compilers
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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.compilers
Date: Mon, 6 Jun 2016 17:08:10 +0200
Organization: Aioe.org NNTP Server
References: 16-06-001
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Keywords: parse
Posted-Date: 07 Jun 2016 10:54:04 EDT

On 06/06/2016 09:08, Andreas Schramm wrote:


> for specifying the syntax of operator expressions
> with multiple levels of precedences,
> there are essentially two approaches:
> (i) by precedence and associativity declarations, and
> (ii) by a hierarchy of non-terminals.


(iii) By only precedence, which I prefer. Associativity is not needed if
operator precedence is split into the left and right ones. That allows
to express any associativity, unary operators included.


--
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de


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